src/imap.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2014 Hiroyuki Yamamoto and the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  *
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #include "claws-features.h"
  23 #endif
  24
  25 #include "defs.h"
  26
  27 #include <glib.h>
  28 #include <glib/gi18n.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include "imap.h"
  32 #include "imap_gtk.h"
  33 #include "inc.h"
  34 #include "xml.h"
  35 #include "alertpanel.h"
  36
  37 #ifdef HAVE_LIBETPAN
  38
  39 #include <stdlib.h>
  40 #include <dirent.h>
  41 #include <unistd.h>
  42 #include <ctype.h>
  43 #include <time.h>
  44 #include <errno.h>
  45 #if HAVE_ICONV
  46 #  include <iconv.h>
  47 #endif
  48
  49 #ifdef USE_GNUTLS
  50 #  include "ssl.h"
  51 #endif
  52
  53 #include "folder.h"
  54 #include "session.h"
  55 #include "procmsg.h"
  56 #include "socket.h"
  57 #include "recv.h"
  58 #include "procheader.h"
  59 #include "prefs_account.h"
  60 #include "codeconv.h"
  61 #include "md5.h"
  62 #include "utils.h"
  63 #include "prefs_common.h"
  64 #include "inputdialog.h"
  65 #include "log.h"
  66 #include "remotefolder.h"
  67 #include "claws.h"
  68 #include "statusbar.h"
  69 #include "msgcache.h"
  70 #include "imap-thread.h"
  71 #include "account.h"
  72 #include "tags.h"
  73 #include "main.h"
  74
  75 typedef struct _IMAPFolder      IMAPFolder;
  76 typedef struct _IMAPSession     IMAPSession;
  77 typedef struct _IMAPNameSpace   IMAPNameSpace;
  78 typedef struct _IMAPFolderItem  IMAPFolderItem;
  79
  80 #include "prefs_account.h"
  81
  82 #define IMAP_FOLDER(obj)        ((IMAPFolder *)obj)
  83 #define IMAP_FOLDER_ITEM(obj)   ((IMAPFolderItem *)obj)
  84 #define IMAP_SESSION(obj)       ((IMAPSession *)obj)
  85
  86 struct _IMAPFolder
  87 {
  88         RemoteFolder rfolder;
  89
  90         /* list of IMAPNameSpace */
  91         GList *ns_personal;
  92         GList *ns_others;
  93         GList *ns_shared;
  94         gchar last_seen_separator;
  95         guint refcnt;
  96         guint max_set_size;
  97         gchar *search_charset;
  98         gboolean search_charset_supported;
  99 };
 100
 101 struct _IMAPSession
 102 {
 103         Session session;
 104
 105         gboolean authenticated;
 106
 107         GSList *capability;
 108         gboolean uidplus;
 109
 110         gchar *mbox;
 111         guint cmd_count;
 112
 113         /* CLAWS */
 114         gboolean folder_content_changed;
 115         guint exists;
 116         guint recent;
 117         guint expunge;
 118         guint unseen;
 119         guint uid_validity;
 120         guint uid_next;
 121
 122         Folder * folder;
 123         gboolean busy;
 124         gboolean cancelled;
 125         gboolean sens_update_block;
 126         gboolean do_destroy;
 127 };
 128
 129 struct _IMAPNameSpace
 130 {
 131         gchar *name;
 132         gchar separator;
 133 };
 134
 135 #define IMAPBUFSIZE     8192
 136
 137 #define IMAP_IS_SEEN(flags)     ((flags & IMAP_FLAG_SEEN) != 0)
 138 #define IMAP_IS_ANSWERED(flags) ((flags & IMAP_FLAG_ANSWERED) != 0)
 139 #define IMAP_IS_FLAGGED(flags)  ((flags & IMAP_FLAG_FLAGGED) != 0)
 140 #define IMAP_IS_DELETED(flags)  ((flags & IMAP_FLAG_DELETED) != 0)
 141 #define IMAP_IS_DRAFT(flags)    ((flags & IMAP_FLAG_DRAFT) != 0)
 142 #define IMAP_IS_FORWARDED(flags)        ((flags & IMAP_FLAG_FORWARDED) != 0)
 143 #define IMAP_IS_SPAM(flags)     ((flags & IMAP_FLAG_SPAM) != 0)
 144 #define IMAP_IS_HAM(flags)      ((flags & IMAP_FLAG_HAM) != 0)
 145
 146
 147 #define IMAP4_PORT      143
 148 #ifdef USE_GNUTLS
 149 #define IMAPS_PORT      993
 150 #endif
 151
 152 #define IMAP_CMD_LIMIT  1000
 153
 154 enum {
 155         ITEM_CAN_CREATE_FLAGS_UNKNOWN = 0,
 156         ITEM_CAN_CREATE_FLAGS,
 157         ITEM_CANNOT_CREATE_FLAGS
 158 };
 159
 160 struct _IMAPFolderItem
 161 {
 162         FolderItem item;
 163
 164         guint lastuid;
 165         guint uid_next;
 166         GSList *uid_list;
 167         gboolean batching;
 168
 169         GHashTable *flags_set_table;
 170         GHashTable *flags_unset_table;
 171         guint32 last_change;
 172         guint32 last_sync;
 173         gboolean should_update;
 174         gboolean should_trash_cache;
 175         gint can_create_flags;
 176
 177         GHashTable *tags_set_table;
 178         GHashTable *tags_unset_table;
 179         GSList *ok_flags;
 180
 181 };
 182
 183 static XMLTag *imap_item_get_xml(Folder *folder, FolderItem *item);
 184 static void imap_item_set_xml(Folder *folder, FolderItem *item, XMLTag *tag);
 185
 186 static void imap_folder_init            (Folder         *folder,
 187                                          const gchar    *name,
 188                                          const gchar    *path);
 189
 190 static Folder   *imap_folder_new        (const gchar    *name,
 191                                          const gchar    *path);
 192 static void      imap_folder_destroy    (Folder         *folder);
 193
 194 static IMAPSession *imap_session_new    (Folder         *folder,
 195                                          const PrefsAccount     *account);
 196 static gint     imap_session_authenticate(IMAPSession   *session,
 197                                           PrefsAccount  *account);
 198 static void     imap_session_destroy    (Session        *session);
 199
 200 static gchar   *imap_fetch_msg          (Folder         *folder,
 201                                          FolderItem     *item,
 202                                          gint            uid);
 203 static gchar   *imap_fetch_msg_full     (Folder         *folder,
 204                                          FolderItem     *item,
 205                                          gint            uid,
 206                                          gboolean        headers,
 207                                          gboolean        body);
 208 static void     imap_remove_cached_msg  (Folder         *folder,
 209                                          FolderItem     *item,
 210                                          MsgInfo        *msginfo);
 211 static gint     imap_add_msg            (Folder         *folder,
 212                                          FolderItem     *dest,
 213                                          const gchar    *file,
 214                                          MsgFlags       *flags);
 215 static gint     imap_add_msgs           (Folder         *folder,
 216                                          FolderItem     *dest,
 217                                          GSList         *file_list,
 218                                          GHashTable     *relation);
 219
 220 static gint     imap_copy_msg           (Folder         *folder,
 221                                          FolderItem     *dest,
 222                                          MsgInfo        *msginfo);
 223 static gint     imap_copy_msgs          (Folder         *folder,
 224                                          FolderItem     *dest,
 225                                          MsgInfoList    *msglist,
 226                                          GHashTable     *relation);
 227
 228 static gint     search_msgs             (Folder                 *folder,
 229                                          FolderItem             *container,
 230                                          MsgNumberList          **msgs,
 231                                          gboolean               *on_server,
 232                                          MatcherList            *predicate,
 233                                          SearchProgressNotify   progress_cb,
 234                                          gpointer               progress_data);
 235
 236 static gint     imap_remove_msg         (Folder         *folder,
 237                                          FolderItem     *item,
 238                                          gint            uid);
 239 static gint     imap_remove_msgs        (Folder         *folder,
 240                                          FolderItem     *dest,
 241                                          MsgInfoList    *msglist,
 242                                          GHashTable     *relation);
 243 static gint     imap_expunge            (Folder         *folder,
 244                                          FolderItem     *dest);
 245 static gint     imap_remove_all_msg     (Folder         *folder,
 246                                          FolderItem     *item);
 247
 248 static gboolean imap_is_msg_changed     (Folder         *folder,
 249                                          FolderItem     *item,
 250                                          MsgInfo        *msginfo);
 251
 252 static gint     imap_close              (Folder         *folder,
 253                                          FolderItem     *item);
 254
 255 static gint     imap_scan_tree          (Folder         *folder);
 256
 257 static gint     imap_create_tree        (Folder         *folder);
 258
 259 static FolderItem *imap_create_folder   (Folder         *folder,
 260                                          FolderItem     *parent,
 261                                          const gchar    *name);
 262 static gint     imap_rename_folder      (Folder         *folder,
 263                                          FolderItem     *item,
 264                                          const gchar    *name);
 265 static gint     imap_remove_folder      (Folder         *folder,
 266                                          FolderItem     *item);
 267
 268 static FolderItem *imap_folder_item_new (Folder         *folder);
 269 static void imap_folder_item_destroy    (Folder         *folder,
 270                                          FolderItem     *item);
 271
 272 static IMAPSession *imap_session_get    (Folder         *folder);
 273
 274 static gint imap_auth                   (IMAPSession    *session,
 275                                          const gchar    *user,
 276                                          const gchar    *pass,
 277                                          IMAPAuthType    type);
 278
 279 static gint imap_scan_tree_recursive    (IMAPSession    *session,
 280                                          FolderItem     *item,
 281                                          gboolean        subs_only);
 282
 283 static void imap_create_missing_folders (Folder         *folder);
 284 static FolderItem *imap_create_special_folder
 285                                         (Folder                 *folder,
 286                                          SpecialFolderItemType   stype,
 287                                          const gchar            *name);
 288
 289 static gint imap_do_copy_msgs           (Folder         *folder,
 290                                          FolderItem     *dest,
 291                                          MsgInfoList    *msglist,
 292                                          GHashTable     *relation,
 293                                          gboolean        same_dest_ok);
 294
 295 static gint imap_do_remove_msgs         (Folder         *folder,
 296                                          FolderItem     *dest,
 297                                          MsgInfoList    *msglist,
 298                                          GHashTable     *relation);
 299
 300 static void imap_delete_all_cached_messages     (FolderItem     *item);
 301 static void imap_set_batch              (Folder         *folder,
 302                                          FolderItem     *item,
 303                                          gboolean        batch);
 304 static gint imap_set_message_flags      (IMAPSession    *session,
 305                                          IMAPFolderItem *item,
 306                                          MsgNumberList  *numlist,
 307                                          IMAPFlags       flags,
 308                                          GSList         *tags,
 309                                          gboolean        is_set);
 310 static gint imap_select                 (IMAPSession    *session,
 311                                          IMAPFolder     *folder,
 312                                          FolderItem     *item,
 313                                          gint           *exists,
 314                                          gint           *recent,
 315                                          gint           *unseen,
 316                                          guint32        *uid_validity,
 317                                          gint           *can_create_flags,
 318                                          gboolean        block);
 319 static gint imap_status                 (IMAPSession    *session,
 320                                          IMAPFolder     *folder,
 321                                          const gchar    *path,
 322                                          IMAPFolderItem *item,
 323                                          gint           *messages,
 324                                          guint32        *uid_next,
 325                                          guint32        *uid_validity,
 326                                          gint           *unseen,
 327                                          gboolean        block);
 328 static void     imap_commit_tags        (FolderItem     *item,
 329                                          MsgInfo        *msginfo,
 330                                          GSList         *set_tags,
 331                                          GSList         *unset_tags);
 332
 333 static gchar imap_get_path_separator            (IMAPSession    *session,
 334                                                  IMAPFolder     *folder,
 335                                                  const gchar    *path,
 336                                                  gint           *ok);
 337 static gchar *imap_get_real_path                (IMAPSession    *session,
 338                                                  IMAPFolder     *folder,
 339                                                  const gchar    *path,
 340                                                  gint           *ok);
 341 #ifdef HAVE_LIBETPAN
 342 static void imap_synchronise            (FolderItem     *item, gint days);
 343 #endif
 344 static gboolean imap_is_busy            (Folder *folder);
 345
 346 static void imap_free_capabilities      (IMAPSession    *session);
 347
 348 /* low-level IMAP4rev1 commands */
 349 static gint imap_cmd_login      (IMAPSession    *session,
 350                                  const gchar    *user,
 351                                  const gchar    *pass,
 352                                  const gchar    *type);
 353 static gint imap_cmd_noop       (IMAPSession    *session);
 354 #ifdef USE_GNUTLS
 355 static gint imap_cmd_starttls   (IMAPSession    *session);
 356 #endif
 357 static gint imap_cmd_select     (IMAPSession    *session,
 358                                  const gchar    *folder,
 359                                  gint           *exists,
 360                                  gint           *recent,
 361                                  gint           *unseen,
 362                                  guint32        *uid_validity,
 363                                  gint           *can_create_flags,
 364                                  GSList         **ok_flags,
 365                                  gboolean        block);
 366 static gint imap_cmd_close      (IMAPSession    *session);
 367 static gint imap_cmd_examine    (IMAPSession    *session,
 368                                  const gchar    *folder,
 369                                  gint           *exists,
 370                                  gint           *recent,
 371                                  gint           *unseen,
 372                                  guint32        *uid_validity,
 373                                  gboolean        block);
 374 static gint imap_cmd_create     (IMAPSession    *sock,
 375                                  const gchar    *folder);
 376 static gint imap_cmd_rename     (IMAPSession    *sock,
 377                                  const gchar    *oldfolder,
 378                                  const gchar    *newfolder);
 379 static gint imap_cmd_delete     (IMAPSession    *session,
 380                                  const gchar    *folder);
 381 static gint imap_cmd_fetch      (IMAPSession    *sock,
 382                                  guint32         uid,
 383                                  const gchar    *filename,
 384                                  gboolean        headers,
 385                                  gboolean        body);
 386 static gint imap_cmd_append     (IMAPSession    *session,
 387                                  IMAPFolderItem *item,
 388                                  const gchar    *destfolder,
 389                                  const gchar    *file,
 390                                  IMAPFlags       flags,
 391                                  guint32        *new_uid);
 392 static gint imap_cmd_copy       (IMAPSession *session,
 393                                  struct mailimap_set * set,
 394                                  const gchar *destfolder,
 395                                  struct mailimap_set ** source,
 396                                  struct mailimap_set ** dest);
 397 static gint imap_cmd_store      (IMAPSession    *session,
 398                                  IMAPFolderItem *item,
 399                                  struct mailimap_set * set,
 400                                  IMAPFlags flags,
 401                                  GSList *tags,
 402                                  int do_add);
 403 static gint imap_cmd_expunge    (IMAPSession    *session, gboolean force);
 404
 405 static void imap_path_separator_subst           (gchar          *str,
 406                                                  gchar           separator);
 407
 408 static gboolean imap_rename_folder_func         (GNode          *node,
 409                                                  gpointer        data);
 410 static gint imap_get_num_list                   (Folder         *folder,
 411                                                  FolderItem     *item,
 412                                                  GSList        **list,
 413                                                  gboolean       *old_uids_valid);
 414 static GSList *imap_get_msginfos                (Folder         *folder,
 415                                                  FolderItem     *item,
 416                                                  GSList         *msgnum_list);
 417 static MsgInfo *imap_get_msginfo                (Folder         *folder,
 418                                                  FolderItem     *item,
 419                                                  gint            num);
 420 static gboolean imap_scan_required              (Folder         *folder,
 421                                                  FolderItem     *item);
 422 static void imap_change_flags                   (Folder         *folder,
 423                                                  FolderItem     *item,
 424                                                  MsgInfo        *msginfo,
 425                                                  MsgPermFlags    newflags);
 426 static gint imap_get_flags                      (Folder         *folder,
 427                                                  FolderItem     *item,
 428                                                  MsgInfoList    *msglist,
 429                                                  GHashTable     *msgflags);
 430 static gchar *imap_folder_get_path              (Folder         *folder);
 431 static gchar *imap_item_get_path                (Folder         *folder,
 432                                                  FolderItem     *item);
 433 static MsgInfo *imap_parse_msg(const gchar *file, FolderItem *item);
 434
 435
 436 /* data types conversion libetpan <-> claws */
 437 static GSList * imap_list_from_lep(IMAPFolder * folder,
 438                                    clist * list, const gchar * real_path, gboolean all);
 439 static GSList * imap_get_lep_set_from_numlist(IMAPFolder *folder, MsgNumberList *numlist);
 440 static GSList * imap_get_lep_set_from_msglist(IMAPFolder *folder, MsgInfoList *msglist);
 441 static GSList * imap_uid_list_from_lep(clist * list, gint* length);
 442 static GSList * imap_uid_list_from_lep_tab(carray * list);
 443 static void imap_flags_hash_from_lep_uid_flags_tab(carray * list,
 444                                                    GHashTable * hash,
 445                                                    GHashTable *tags_hash);
 446 static MsgInfo *imap_envelope_from_lep(struct imap_fetch_env_info * info,
 447                                        FolderItem *item);
 448 static void imap_lep_set_free(GSList *seq_list);
 449 static struct mailimap_flag_list * imap_flag_to_lep(IMAPFolderItem *item, IMAPFlags flags, GSList *tags);
 450
 451 typedef struct _hashtable_data {
 452         GSList *msglist;
 453         IMAPFolderItem *item;
 454 } hashtable_data;
 455
 456 static FolderClass imap_class;
 457
 458 FolderClass *imap_get_class(void)
 459 {
 460         if (imap_class.idstr == NULL) {
 461                 imap_class.type = F_IMAP;
 462                 imap_class.idstr = "imap";
 463                 imap_class.uistr = "IMAP4";
 464                 imap_class.supports_server_search = TRUE;
 465
 466                 /* Folder functions */
 467                 imap_class.new_folder = imap_folder_new;
 468                 imap_class.destroy_folder = imap_folder_destroy;
 469                 imap_class.scan_tree = imap_scan_tree;
 470                 imap_class.create_tree = imap_create_tree;
 471
 472                 /* FolderItem functions */
 473                 imap_class.item_new = imap_folder_item_new;
 474                 imap_class.item_destroy = imap_folder_item_destroy;
 475                 imap_class.item_get_path = imap_item_get_path;
 476                 imap_class.create_folder = imap_create_folder;
 477                 imap_class.rename_folder = imap_rename_folder;
 478                 imap_class.remove_folder = imap_remove_folder;
 479                 imap_class.close = imap_close;
 480                 imap_class.get_num_list = imap_get_num_list;
 481                 imap_class.scan_required = imap_scan_required;
 482                 imap_class.set_xml = folder_set_xml;
 483                 imap_class.get_xml = folder_get_xml;
 484                 imap_class.item_set_xml = imap_item_set_xml;
 485                 imap_class.item_get_xml = imap_item_get_xml;
 486
 487                 /* Message functions */
 488                 imap_class.get_msginfo = imap_get_msginfo;
 489                 imap_class.get_msginfos = imap_get_msginfos;
 490                 imap_class.fetch_msg = imap_fetch_msg;
 491                 imap_class.fetch_msg_full = imap_fetch_msg_full;
 492                 imap_class.add_msg = imap_add_msg;
 493                 imap_class.add_msgs = imap_add_msgs;
 494                 imap_class.copy_msg = imap_copy_msg;
 495                 imap_class.copy_msgs = imap_copy_msgs;
 496                 imap_class.search_msgs = search_msgs;
 497                 imap_class.remove_msg = imap_remove_msg;
 498                 imap_class.remove_msgs = imap_remove_msgs;
 499                 imap_class.expunge = imap_expunge;
 500                 imap_class.remove_all_msg = imap_remove_all_msg;
 501                 imap_class.is_msg_changed = imap_is_msg_changed;
 502                 imap_class.change_flags = imap_change_flags;
 503                 imap_class.get_flags = imap_get_flags;
 504                 imap_class.set_batch = imap_set_batch;
 505                 imap_class.synchronise = imap_synchronise;
 506                 imap_class.remove_cached_msg = imap_remove_cached_msg;
 507                 imap_class.commit_tags = imap_commit_tags;
 508 #ifdef USE_PTREAD
 509                 pthread_mutex_init(&imap_mutex, NULL);
 510 #endif
 511         }
 512
 513         return &imap_class;
 514 }
 515
 516 static void imap_refresh_sensitivity (IMAPSession *session)
 517 {
 518         MainWindow *mainwin;
 519
 520         if (session->sens_update_block)
 521                 return;
 522         mainwin = mainwindow_get_mainwindow();
 523         if (mainwin) {
 524                 toolbar_main_set_sensitive(mainwin);
 525                 main_window_set_menu_sensitive(mainwin);
 526         }
 527 }
 528
 529 static void lock_session(IMAPSession *session)
 530 {
 531         if (session) {
 532                 debug_print("locking session %p (%d)\n", session, session->busy);
 533                 if (session->busy)
 534                         debug_print("         SESSION WAS LOCKED !!      \n");
 535                 session->busy = TRUE;
 536                 imap_refresh_sensitivity(session);
 537         } else {
 538                 debug_print("can't lock null session\n");
 539         }
 540 }
 541
 542 static void unlock_session(IMAPSession *session)
 543 {
 544         if (session) {
 545                 debug_print("unlocking session %p\n", session);
 546                 session->busy = FALSE;
 547                 imap_refresh_sensitivity(session);
 548         } else {
 549                 debug_print("can't unlock null session\n");
 550         }
 551 }
 552
 553 static gboolean imap_ping(gpointer data)
 554 {
 555         Session *session = (Session *)data;
 556         IMAPSession *imap_session = IMAP_SESSION(session);
 557         int r;
 558
 559         if (session->state != SESSION_READY)
 560                 return FALSE;
 561         if (imap_session->busy || !imap_session->authenticated)
 562                 return TRUE;
 563
 564         lock_session(imap_session);
 565         r = imap_cmd_noop(imap_session);
 566         unlock_session(imap_session);
 567
 568         return r == MAILIMAP_NO_ERROR;
 569 }
 570
 571 static void imap_disc_session_destroy(IMAPSession *session)
 572 {
 573         RemoteFolder *rfolder = NULL;
 574
 575         if (session == NULL)
 576                 return;
 577
 578         rfolder = REMOTE_FOLDER(IMAP_SESSION(session)->folder);
 579
 580         if (rfolder == NULL)
 581                 return;
 582         log_warning(LOG_PROTOCOL, _("IMAP4 connection broken\n"));
 583         SESSION(session)->state = SESSION_DISCONNECTED;
 584         SESSION(session)->sock = NULL;
 585 }
 586
 587 static void imap_safe_destroy(IMAPSession *session)
 588 {
 589         if (!session->busy)
 590                 session_destroy(SESSION(session));
 591         else
 592                 session->do_destroy = TRUE;
 593 }
 594
 595 static gboolean is_fatal(int libetpan_errcode)
 596 {
 597         switch(libetpan_errcode) {
 598         case MAILIMAP_ERROR_STREAM:
 599         case MAILIMAP_ERROR_PROTOCOL:
 600         case MAILIMAP_ERROR_PARSE:
 601         case MAILIMAP_ERROR_BAD_STATE:
 602                 return TRUE;
 603         default:
 604                 return FALSE;
 605         }
 606 }
 607
 608 static void imap_handle_error(Session *session, const gchar *server, int libetpan_errcode)
 609 {
 610         const gchar *session_server = (session ? session->server : NULL);
 611
 612         if (session_server == NULL)
 613                 session_server = server;
 614         if (session_server == NULL)
 615                 session_server = "(null)";
 616
 617         switch(libetpan_errcode) {
 618         case MAILIMAP_NO_ERROR:
 619                 return;
 620         case MAILIMAP_NO_ERROR_AUTHENTICATED:
 621                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: authenticated\n"), session_server);
 622                 break;
 623         case MAILIMAP_NO_ERROR_NON_AUTHENTICATED:
 624                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: not authenticated\n"), session_server);
 625                 break;
 626         case MAILIMAP_ERROR_BAD_STATE:
 627                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: bad state\n"), session_server);
 628                 break;
 629         case MAILIMAP_ERROR_STREAM:
 630                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: stream error\n"), session_server);
 631                 break;
 632         case MAILIMAP_ERROR_PARSE:
 633                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: parse error "
 634                                             "(very probably non-RFC compliance from the server)\n"), session_server);
 635                 break;
 636         case MAILIMAP_ERROR_CONNECTION_REFUSED:
 637                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: connection refused\n"), session_server);
 638                 break;
 639         case MAILIMAP_ERROR_MEMORY:
 640                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: memory error\n"), session_server);
 641                 break;
 642         case MAILIMAP_ERROR_FATAL:
 643                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: fatal error\n"), session_server);
 644                 break;
 645         case MAILIMAP_ERROR_PROTOCOL:
 646                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: protocol error"
 647                                             "(very probably non-RFC compliance from the server)\n"), session_server);
 648                 break;
 649         case MAILIMAP_ERROR_DONT_ACCEPT_CONNECTION:
 650                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: connection not accepted\n"), session_server);
 651                 break;
 652         case MAILIMAP_ERROR_APPEND:
 653                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: APPEND error\n"), session_server);
 654                 break;
 655         case MAILIMAP_ERROR_NOOP:
 656                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: NOOP error\n"), session_server);
 657                 break;
 658         case MAILIMAP_ERROR_LOGOUT:
 659                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: LOGOUT error\n"), session_server);
 660                 break;
 661         case MAILIMAP_ERROR_CAPABILITY:
 662                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: CAPABILITY error\n"), session_server);
 663                 break;
 664         case MAILIMAP_ERROR_CHECK:
 665                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: CHECK error\n"), session_server);
 666                 break;
 667         case MAILIMAP_ERROR_CLOSE:
 668                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: CLOSE error\n"), session_server);
 669                 break;
 670         case MAILIMAP_ERROR_EXPUNGE:
 671                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: EXPUNGE error\n"), session_server);
 672                 break;
 673         case MAILIMAP_ERROR_COPY:
 674                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: COPY error\n"), session_server);
 675                 break;
 676         case MAILIMAP_ERROR_UID_COPY:
 677                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: UID COPY error\n"), session_server);
 678                 break;
 679         case MAILIMAP_ERROR_CREATE:
 680                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: CREATE error\n"), session_server);
 681                 break;
 682         case MAILIMAP_ERROR_DELETE:
 683                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: DELETE error\n"), session_server);
 684                 break;
 685         case MAILIMAP_ERROR_EXAMINE:
 686                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: EXAMINE error\n"), session_server);
 687                 break;
 688         case MAILIMAP_ERROR_FETCH:
 689                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: FETCH error\n"), session_server);
 690                 break;
 691         case MAILIMAP_ERROR_UID_FETCH:
 692                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: UID FETCH error\n"), session_server);
 693                 break;
 694         case MAILIMAP_ERROR_LIST:
 695                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: LIST error\n"), session_server);
 696                 break;
 697         case MAILIMAP_ERROR_LOGIN:
 698                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: LOGIN error\n"), session_server);
 699                 break;
 700         case MAILIMAP_ERROR_LSUB:
 701                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: LSUB error\n"), session_server);
 702                 break;
 703         case MAILIMAP_ERROR_RENAME:
 704                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: RENAME error\n"), session_server);
 705                 break;
 706         case MAILIMAP_ERROR_SEARCH:
 707                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: SEARCH error\n"), session_server);
 708                 break;
 709         case MAILIMAP_ERROR_UID_SEARCH:
 710                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: UID SEARCH error\n"), session_server);
 711                 break;
 712         case MAILIMAP_ERROR_SELECT:
 713                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: SELECT error\n"), session_server);
 714                 break;
 715         case MAILIMAP_ERROR_STATUS:
 716                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: STATUS error\n"), session_server);
 717                 break;
 718         case MAILIMAP_ERROR_STORE:
 719                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: STORE error\n"), session_server);
 720                 break;
 721         case MAILIMAP_ERROR_UID_STORE:
 722                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: UID STORE error\n"), session_server);
 723                 break;
 724         case MAILIMAP_ERROR_SUBSCRIBE:
 725                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: SUBSCRIBE error\n"), session_server);
 726                 break;
 727         case MAILIMAP_ERROR_UNSUBSCRIBE:
 728                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: UNSUBSCRIBE error\n"), session_server);
 729                 break;
 730         case MAILIMAP_ERROR_STARTTLS:
 731                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: STARTTLS error\n"), session_server);
 732                 break;
 733         case MAILIMAP_ERROR_INVAL:
 734                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: INVAL error\n"), session_server);
 735                 break;
 736         case MAILIMAP_ERROR_EXTENSION:
 737                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: EXTENSION error\n"), session_server);
 738                 break;
 739         case MAILIMAP_ERROR_SASL:
 740                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: SASL error\n"), session_server);
 741                 break;
 742 #ifdef USE_GNUTLS
 743         case MAILIMAP_ERROR_SSL:
 744                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: SSL error\n"), session_server);
 745                 break;
 746 #endif
 747         default:
 748                 log_warning(LOG_PROTOCOL, _("IMAP error on %s: Unknown error [%d]\n"),
 749                         session_server, libetpan_errcode);
 750                 break;
 751         }
 752
 753         if (session && is_fatal(libetpan_errcode)) {
 754                 imap_disc_session_destroy(IMAP_SESSION(session));
 755         } else if (session && !is_fatal(libetpan_errcode)) {
 756                 if (IMAP_SESSION(session)->busy)
 757                         unlock_session(IMAP_SESSION(session));
 758         }
 759 }
 760
 761 static Folder *imap_folder_new(const gchar *name, const gchar *path)
 762 {
 763         Folder *folder;
 764
 765         folder = (Folder *)g_new0(IMAPFolder, 1);
 766         folder->klass = &imap_class;
 767         imap_folder_init(folder, name, path);
 768
 769         return folder;
 770 }
 771
 772 static void imap_folder_destroy(Folder *folder)
 773 {
 774         while (imap_folder_get_refcnt(folder) > 0)
 775                 gtk_main_iteration();
 776
 777         g_free(IMAP_FOLDER(folder)->search_charset);
 778
 779         folder_remote_folder_destroy(REMOTE_FOLDER(folder));
 780         imap_done(folder);
 781 }
 782
 783 static void imap_folder_init(Folder *folder, const gchar *name,
 784                              const gchar *path)
 785 {
 786         folder_remote_folder_init((Folder *)folder, name, path);
 787         IMAP_FOLDER(folder)->max_set_size = IMAP_SET_MAX_COUNT;
 788         IMAP_FOLDER(folder)->search_charset_supported = TRUE;
 789         IMAP_FOLDER(folder)->search_charset = g_strdup(conv_get_locale_charset_str_no_utf8());
 790 }
 791
 792 static FolderItem *imap_folder_item_new(Folder *folder)
 793 {
 794         IMAPFolderItem *item;
 795
 796         item = g_new0(IMAPFolderItem, 1);
 797         item->lastuid = 0;
 798         item->uid_next = 0;
 799         item->uid_list = NULL;
 800
 801         return (FolderItem *)item;
 802 }
 803
 804 static void imap_folder_item_destroy(Folder *folder, FolderItem *_item)
 805 {
 806         IMAPFolderItem *item = (IMAPFolderItem *)_item;
 807
 808         g_return_if_fail(item != NULL);
 809         g_slist_free(item->uid_list);
 810
 811         g_free(_item);
 812 }
 813
 814 static gboolean imap_reset_uid_lists_func(GNode *node, gpointer data)
 815 {
 816         IMAPFolderItem *item = (IMAPFolderItem *)node->data;
 817
 818         item->lastuid = 0;
 819         g_slist_free(item->uid_list);
 820         item->uid_list = NULL;
 821
 822         return FALSE;
 823 }
 824
 825 static void imap_reset_uid_lists(Folder *folder)
 826 {
 827         if(folder->node == NULL)
 828                 return;
 829
 830         /* Destroy all uid lists and rest last uid */
 831         g_node_traverse(folder->node, G_IN_ORDER, G_TRAVERSE_ALL, -1, imap_reset_uid_lists_func, NULL);
 832 }
 833
 834 static int imap_get_capabilities(IMAPSession *session)
 835 {
 836         struct mailimap_capability_data *capabilities = NULL;
 837         clistiter *cur;
 838         int result = -1;
 839
 840         if (session->capability != NULL)
 841                 return MAILIMAP_NO_ERROR;
 842
 843         capabilities = imap_threaded_capability(session->folder, &result);
 844
 845         if (result != MAILIMAP_NO_ERROR) {
 846                 return result;
 847         }
 848
 849         if (capabilities == NULL || capabilities->cap_list == NULL) {
 850                 return MAILIMAP_NO_ERROR;
 851         }
 852
 853         for(cur = clist_begin(capabilities->cap_list) ; cur != NULL ;
 854             cur = clist_next(cur)) {
 855                 struct mailimap_capability * cap =
 856                         clist_content(cur);
 857                 if (!cap || cap->cap_data.cap_name == NULL)
 858                         continue;
 859                 session->capability = g_slist_append
 860                                 (session->capability,
 861                                  g_strdup(cap->cap_data.cap_name));
 862                 debug_print("got capa %s\n", cap->cap_data.cap_name);
 863         }
 864         mailimap_capability_data_free(capabilities);
 865         return MAILIMAP_NO_ERROR;
 866 }
 867
 868 static gboolean imap_has_capability(IMAPSession *session, const gchar *cap)
 869 {
 870         GSList *cur;
 871         for (cur = session->capability; cur; cur = cur->next) {
 872                 if (!g_ascii_strcasecmp(cur->data, cap))
 873                         return TRUE;
 874         }
 875         return FALSE;
 876 }
 877
 878 static gint imap_auth(IMAPSession *session, const gchar *user, const gchar *pass,
 879                       IMAPAuthType type)
 880 {
 881         gint ok = MAILIMAP_ERROR_LOGIN;
 882         static time_t last_login_err = 0;
 883         gchar *ext_info = "";
 884         int r;
 885         gchar *server = NULL;
 886         if ((r = imap_get_capabilities(session)) != MAILIMAP_NO_ERROR) {
 887                 imap_handle_error(SESSION(session), NULL, r);
 888                 return r;
 889         }
 890         server = g_strdup(SESSION(session)->server);
 891         switch(type) {
 892         case IMAP_AUTH_ANON:
 893                 ok = imap_cmd_login(session, user, pass, "ANONYMOUS");
 894                 break;
 895         case IMAP_AUTH_CRAM_MD5:
 896                 ok = imap_cmd_login(session, user, pass, "CRAM-MD5");
 897                 break;
 898         case IMAP_AUTH_DIGEST_MD5:
 899                 ok = imap_cmd_login(session, user, pass, "DIGEST-MD5");
 900                 break;
 901         case IMAP_AUTH_LOGIN:
 902                 ok = imap_cmd_login(session, user, pass, "LOGIN");
 903                 break;
 904         case IMAP_AUTH_GSSAPI:
 905                 ok = imap_cmd_login(session, user, pass, "GSSAPI");
 906                 break;
 907         default:
 908                 debug_print("capabilities:\n"
 909                                 "\t ANONYMOUS %d\n"
 910                                 "\t CRAM-MD5 %d\n"
 911                                 "\t DIGEST-MD5 %d\n"
 912                                 "\t LOGIN %d\n"
 913                                 "\t GSSAPI %d\n",
 914                         imap_has_capability(session, "ANONYMOUS"),
 915                         imap_has_capability(session, "CRAM-MD5"),
 916                         imap_has_capability(session, "DIGEST-MD5"),
 917                         imap_has_capability(session, "LOGIN"),
 918                         imap_has_capability(session, "GSSAPI"));
 919                 if (imap_has_capability(session, "CRAM-MD5"))
 920                         ok = imap_cmd_login(session, user, pass, "CRAM-MD5");
 921                 if (ok == MAILIMAP_ERROR_LOGIN && imap_has_capability(session, "DIGEST-MD5"))
 922                         ok = imap_cmd_login(session, user, pass, "DIGEST-MD5");
 923                 if (ok == MAILIMAP_ERROR_LOGIN && imap_has_capability(session, "GSSAPI"))
 924                         ok = imap_cmd_login(session, user, pass, "GSSAPI");
 925                 if (ok == MAILIMAP_ERROR_LOGIN) /* we always try LOGIN before giving up */
 926                         ok = imap_cmd_login(session, user, pass, "LOGIN");
 927         }
 928
 929         if (ok == MAILIMAP_NO_ERROR)
 930                 session->authenticated = TRUE;
 931         else {
 932                 if (type == IMAP_AUTH_CRAM_MD5) {
 933                         ext_info = _("\n\nCRAM-MD5 logins only work if libetpan has been "
 934                                      "compiled with SASL support and the "
 935                                      "CRAM-MD5 SASL plugin is installed.");
 936                 }
 937
 938                 if (type == IMAP_AUTH_DIGEST_MD5) {
 939                         ext_info = _("\n\nDIGEST-MD5 logins only work if libetpan has been "
 940                                      "compiled with SASL support and the "
 941                                      "DIGEST-MD5 SASL plugin is installed.");
 942                 }
 943
 944                 if (time(NULL) - last_login_err > 10) {
 945                         if (!prefs_common.no_recv_err_panel) {
 946                                 alertpanel_error_log(_("Connection to %s failed: "
 947                                         "login refused.%s"),
 948                                         server, ext_info);
 949                         } else {
 950                                 log_error(LOG_PROTOCOL, _("Connection to %s failed: "
 951                                         "login refused.%s\n"),
 952                                         server, ext_info);
 953                         }
 954                 }
 955                 last_login_err = time(NULL);
 956         }
 957         g_free(server);
 958         return ok;
 959 }
 960
 961 static IMAPSession *imap_reconnect_if_possible(Folder *folder, IMAPSession *session)
 962 {
 963         RemoteFolder *rfolder = REMOTE_FOLDER(folder);
 964         /* Check if this is the first try to establish a
 965            connection, if yes we don't try to reconnect */
 966         debug_print("reconnecting\n");
 967         if (rfolder->session == NULL) {
 968                 log_warning(LOG_PROTOCOL, _("Connecting to %s failed"),
 969                             folder->account->recv_server);
 970                 SESSION(session)->sock = NULL;
 971                 imap_safe_destroy(session);
 972                 session = NULL;
 973         } else {
 974                 rfolder->session = NULL;
 975                 log_warning(LOG_PROTOCOL, _("IMAP4 connection to %s has been"
 976                             " disconnected. Reconnecting...\n"),
 977                             folder->account->recv_server);
 978                 statusbar_print_all(_("IMAP4 connection to %s has been"
 979                             " disconnected. Reconnecting...\n"),
 980                             folder->account->recv_server);
 981                 SESSION(session)->state = SESSION_DISCONNECTED;
 982                 SESSION(session)->sock = NULL;
 983                 imap_safe_destroy(session);
 984                 /* Clear folders session to make imap_session_get create
 985                    a new session, because of rfolder->session == NULL
 986                    it will not try to reconnect again and so avoid an
 987                    endless loop */
 988                 debug_print("getting session...\n");
 989                 session = imap_session_get(folder);
 990                 rfolder->session = SESSION(session);
 991                 statusbar_pop_all();
 992         }
 993         return session;
 994 }
 995
 996 static IMAPSession *imap_session_get(Folder *folder)
 997 {
 998         RemoteFolder *rfolder = REMOTE_FOLDER(folder);
 999         IMAPSession *session = NULL;
1000         gint r = MAILIMAP_NO_ERROR;
1001
1002         g_return_val_if_fail(folder != NULL, NULL);
1003         g_return_val_if_fail(FOLDER_CLASS(folder) == &imap_class, NULL);
1004         g_return_val_if_fail(folder->account != NULL, NULL);
1005
1006         if (prefs_common.work_offline &&
1007             !inc_offline_should_override(FALSE,
1008                 _("Claws Mail needs network access in order "
1009                   "to access the IMAP server."))) {
1010                 return NULL;
1011         }
1012
1013         /* check for deferred destroy */
1014         if (rfolder->session != NULL) {
1015                 session = IMAP_SESSION(rfolder->session);
1016                 if (!session->busy && session->do_destroy) {
1017                         rfolder->session = NULL;
1018                         imap_safe_destroy(session);
1019                         session = NULL;
1020                 }
1021         }
1022
1023         /* Make sure we have a session */
1024         if (rfolder->session != NULL && rfolder->session->state != SESSION_DISCONNECTED) {
1025                 session = IMAP_SESSION(rfolder->session);
1026         } else if (rfolder->session != NULL && rfolder->session->state == SESSION_DISCONNECTED) {
1027                 imap_safe_destroy(IMAP_SESSION(rfolder->session));
1028                 rfolder->session = NULL;
1029                 goto new_conn;
1030         } else if (rfolder->connecting) {
1031                 debug_print("already connecting\n");
1032                 return NULL;
1033         } else {
1034 new_conn:
1035                 imap_reset_uid_lists(folder);
1036                 if (time(NULL) - rfolder->last_failure <= 2)
1037                         return NULL;
1038                 rfolder->connecting = TRUE;
1039                 session = imap_session_new(folder, folder->account);
1040         }
1041         if(session == NULL) {
1042                 rfolder->last_failure = time(NULL);
1043                 rfolder->connecting = FALSE;
1044                 return NULL;
1045         }
1046
1047         /* Make sure session is authenticated */
1048         if (!IMAP_SESSION(session)->authenticated)
1049                 r = imap_session_authenticate(IMAP_SESSION(session), folder->account);
1050
1051         if (r != MAILIMAP_NO_ERROR || (!is_fatal(r) && !IMAP_SESSION(session)->authenticated)) {
1052                 rfolder->session = NULL;
1053                 if (!is_fatal(r)) {
1054                         imap_threaded_disconnect(session->folder);
1055                 }
1056                 SESSION(session)->state = SESSION_DISCONNECTED;
1057                 SESSION(session)->sock = NULL;
1058                 imap_safe_destroy(session);
1059                 rfolder->last_failure = time(NULL);
1060                 rfolder->connecting = FALSE;
1061                 return NULL;
1062         }
1063
1064         /* I think the point of this code is to avoid sending a
1065          * keepalive if we've used the session recently and therefore
1066          * think it's still alive.  Unfortunately, most of the code
1067          * does not yet check for errors on the socket, and so if the
1068          * connection drops we don't notice until the timeout expires.
1069          * A better solution than sending a NOOP every time would be
1070          * for every command to be prepared to retry until it is
1071          * successfully sent. -- mbp */
1072         if ((time(NULL) - SESSION(session)->last_access_time > SESSION_TIMEOUT_INTERVAL) || session->cancelled) {
1073                 /* verify that the session is still alive */
1074                 r = imap_cmd_noop(session);
1075
1076                 if (r != MAILIMAP_NO_ERROR) {
1077                         debug_print("disconnected!\n");
1078                         if (!is_fatal(r))
1079                                 session = imap_reconnect_if_possible(folder, session);
1080                         else {
1081                                 rfolder->session = NULL;
1082                                 rfolder->connecting = FALSE;
1083                                 SESSION(session)->state = SESSION_DISCONNECTED;
1084                                 SESSION(session)->sock = NULL;
1085                                 imap_safe_destroy(session);
1086                                 session = imap_session_get(folder);
1087                         }
1088                 }
1089                 if (session)
1090                         session->cancelled = FALSE;
1091         }
1092
1093         rfolder->session = SESSION(session);
1094         rfolder->connecting = FALSE;
1095
1096         return IMAP_SESSION(session);
1097 }
1098
1099 static IMAPSession *imap_session_new(Folder * folder,
1100                                      const PrefsAccount *account)
1101 {
1102         IMAPSession *session;
1103         gushort port;
1104         int r;
1105         int authenticated = FALSE;
1106         gchar *buf;
1107
1108 #ifdef USE_GNUTLS
1109         /* FIXME: IMAP over SSL only... */
1110         SSLType ssl_type;
1111
1112         port = account->set_imapport ? account->imapport
1113                 : account->ssl_imap == SSL_TUNNEL ? IMAPS_PORT : IMAP4_PORT;
1114         ssl_type = account->ssl_imap;
1115 #else
1116         if (account->ssl_imap != SSL_NONE) {
1117                 if (alertpanel_full(_("Insecure connection"),
1118                         _("This connection is configured to be secured "
1119                           "using SSL, but SSL is not available in this "
1120                           "build of Claws Mail. \n\n"
1121                           "Do you want to continue connecting to this "
1122                           "server? The communication would not be "
1123                           "secure."),
1124                           GTK_STOCK_CANCEL, _("Con_tinue connecting"),
1125                           NULL, FALSE, NULL, ALERT_WARNING,
1126                           G_ALERTDEFAULT) != G_ALERTALTERNATE)
1127                         return NULL;
1128         }
1129         port = account->set_imapport ? account->imapport
1130                 : IMAP4_PORT;
1131 #endif
1132
1133         imap_init(folder);
1134         buf = g_strdup_printf(_("Account '%s': Connecting to IMAP4 server: %s:%d..."),
1135                                 folder->account->account_name, folder->account->recv_server,
1136                                 port);
1137         statuswindow_print_all("%s", buf);
1138         log_message(LOG_PROTOCOL, "%s\n", buf);
1139         g_free(buf);
1140
1141 #ifndef G_OS_WIN32
1142         if (account->set_tunnelcmd) {
1143                 r = imap_threaded_connect_cmd(folder,
1144                                               account->tunnelcmd,
1145                                               account->recv_server,
1146                                               port);
1147         }
1148         else
1149 #endif
1150         {
1151 #ifdef USE_GNUTLS
1152                 if (ssl_type == SSL_TUNNEL) {
1153                         r = imap_threaded_connect_ssl(folder,
1154                                                       account->recv_server,
1155                                                       port);
1156                 }
1157                 else
1158 #endif
1159                 {
1160                         r = imap_threaded_connect(folder,
1161                                                   account->recv_server,
1162                                                   port);
1163                 }
1164         }
1165
1166         statuswindow_pop_all();
1167         if (r == MAILIMAP_NO_ERROR_AUTHENTICATED) {
1168                 authenticated = TRUE;
1169         }
1170         else if (r == MAILIMAP_NO_ERROR_NON_AUTHENTICATED) {
1171                 authenticated = FALSE;
1172         }
1173         else {
1174 #ifdef USE_GNUTLS
1175                 if (r == MAILIMAP_ERROR_SSL)
1176                         log_error(LOG_PROTOCOL, _("SSL handshake failed\n"));
1177                 else
1178 #endif
1179                         imap_handle_error(NULL, account->recv_server, r);
1180
1181                 if(!prefs_common.no_recv_err_panel) {
1182                         alertpanel_error_log(_("Can't connect to IMAP4 server: %s:%d"),
1183                                          account->recv_server, port);
1184                 } else {
1185                         log_error(LOG_PROTOCOL, _("Can't connect to IMAP4 server: %s:%d\n"),
1186                                          account->recv_server, port);
1187                 }
1188
1189                 return NULL;
1190         }
1191
1192         session = g_new0(IMAPSession, 1);
1193         session_init(SESSION(session), account, FALSE);
1194         SESSION(session)->type             = SESSION_IMAP;
1195         SESSION(session)->server           = g_strdup(account->recv_server);
1196         SESSION(session)->port             = port;
1197         SESSION(session)->sock             = NULL;
1198
1199         SESSION(session)->destroy          = imap_session_destroy;
1200
1201         session->capability = NULL;
1202
1203         session->authenticated = authenticated;
1204         session->mbox = NULL;
1205         session->exists = 0;
1206         session->recent = 0;
1207         session->expunge = 0;
1208         session->cmd_count = 0;
1209         session->folder = folder;
1210         IMAP_FOLDER(session->folder)->last_seen_separator = 0;
1211
1212 #ifdef USE_GNUTLS
1213         if (account->ssl_imap == SSL_STARTTLS) {
1214                 gint ok;
1215
1216                 ok = imap_cmd_starttls(session);
1217                 if (ok != MAILIMAP_NO_ERROR) {
1218                         log_warning(LOG_PROTOCOL, _("Can't start TLS session.\n"));
1219                         if (!is_fatal(ok)) {
1220                                 SESSION(session)->sock = NULL;
1221                                 imap_safe_destroy(session);
1222                         }
1223                         return NULL;
1224                 }
1225
1226                 imap_free_capabilities(session);
1227                 session->authenticated = FALSE;
1228                 session->uidplus = FALSE;
1229                 session->cmd_count = 1;
1230         }
1231 #endif
1232         log_message(LOG_PROTOCOL, "IMAP connection is %s-authenticated\n",
1233                     (session->authenticated) ? "pre" : "un");
1234
1235         session_register_ping(SESSION(session), imap_ping);
1236
1237         return session;
1238 }
1239
1240 static gint imap_session_authenticate(IMAPSession *session,
1241                                       PrefsAccount *account)
1242 {
1243         gchar *pass, *acc_pass;
1244         gboolean failed = FALSE;
1245         gint ok = MAILIMAP_NO_ERROR;
1246         g_return_val_if_fail(account->userid != NULL, MAILIMAP_ERROR_BAD_STATE);
1247
1248         if (password_get(account->userid, account->recv_server, "imap",
1249                          SESSION(session)->port, &pass)) {
1250                 Xstrdup_a(acc_pass, pass, {g_free(pass); return MAILIMAP_NO_ERROR;});
1251                 g_free(pass);
1252         } else {
1253                 acc_pass = account->passwd;
1254         }
1255 try_again:
1256         pass = acc_pass;
1257         if (!pass && account->imap_auth_type != IMAP_AUTH_ANON && account->imap_auth_type != IMAP_AUTH_GSSAPI) {
1258                 gchar *tmp_pass;
1259                 tmp_pass = input_dialog_query_password_keep(account->recv_server,
1260                                                             account->userid,
1261                                                             &(account->session_passwd));
1262                 if (!tmp_pass)
1263                         return MAILIMAP_NO_ERROR;
1264                 Xstrdup_a(pass, tmp_pass, {g_free(tmp_pass); return MAILIMAP_NO_ERROR;});
1265                 g_free(tmp_pass);
1266         } else if (account->imap_auth_type == IMAP_AUTH_ANON || account->imap_auth_type == IMAP_AUTH_GSSAPI) {
1267                 pass = "";
1268         }
1269         if ((ok = imap_auth(session, account->userid, pass, account->imap_auth_type)) != MAILIMAP_NO_ERROR) {
1270
1271                 if (!failed && !is_fatal(ok)) {
1272                         acc_pass = NULL;
1273                         failed = TRUE;
1274                         if (account->session_passwd != NULL) {
1275                                 g_free(account->session_passwd);
1276                                 account->session_passwd = NULL;
1277                         }
1278                         goto try_again;
1279                 } else {
1280                         if (prefs_common.no_recv_err_panel) {
1281                                 log_error(LOG_PROTOCOL, _("Couldn't login to IMAP server %s.\n"), account->recv_server);
1282                                 mainwindow_show_error();
1283                         } else
1284                                 alertpanel_error_log(_("Couldn't login to IMAP server %s."), account->recv_server);
1285                 }
1286
1287                 return ok;
1288         }
1289
1290         statuswindow_pop_all();
1291         session->authenticated = TRUE;
1292         return MAILIMAP_NO_ERROR;
1293 }
1294
1295 static void imap_session_destroy(Session *session)
1296 {
1297         if (session->state != SESSION_DISCONNECTED)
1298                 imap_threaded_disconnect(IMAP_SESSION(session)->folder);
1299
1300         imap_free_capabilities(IMAP_SESSION(session));
1301         g_free(IMAP_SESSION(session)->mbox);
1302 }
1303
1304 static gchar *imap_fetch_msg(Folder *folder, FolderItem *item, gint uid)
1305 {
1306         return imap_fetch_msg_full(folder, item, uid, TRUE, TRUE);
1307 }
1308
1309 static guint get_file_size_with_crs(const gchar *filename)
1310 {
1311         FILE *fp = NULL;
1312         guint cnt = 0;
1313         gchar buf[4096];
1314
1315         if (filename == NULL)
1316                 return -1;
1317
1318         fp = g_fopen(filename, "rb");
1319         if (!fp)
1320                 return -1;
1321
1322         while (fgets(buf, sizeof (buf), fp) != NULL) {
1323                 cnt += strlen(buf);
1324                 if (!strstr(buf, "\r\n") && strstr(buf, "\n"))
1325                         cnt++;
1326         }
1327
1328         fclose(fp);
1329         return cnt;
1330 }
1331
1332 static gchar *imap_get_cached_filename(FolderItem *item, guint msgnum)
1333 {
1334         gchar *path, *filename;
1335
1336         cm_return_val_if_fail(item != NULL, NULL);
1337
1338         path = folder_item_get_path(item);
1339
1340         if (!is_dir_exist(path)) {
1341                 g_free(path);
1342                 return NULL;
1343         }
1344
1345         filename = g_strconcat(path, G_DIR_SEPARATOR_S, itos(msgnum), NULL);
1346
1347         if (is_dir_exist(filename)) {
1348                 g_free(filename);
1349                 filename = g_strconcat(path, G_DIR_SEPARATOR_S, ".", itos(msgnum), NULL);
1350         }
1351         g_free(path);
1352
1353         return filename;
1354 }
1355
1356 static void imap_remove_cached_msg(Folder *folder, FolderItem *item, MsgInfo *msginfo)
1357 {
1358         gchar *filename;
1359
1360         filename = imap_get_cached_filename(item, msginfo->msgnum);
1361
1362         cm_return_if_fail(filename != NULL);
1363
1364         if (is_file_exist(filename)) {
1365                 claws_unlink(filename);
1366         }
1367         g_free(filename);
1368 }
1369
1370 typedef struct _TagsData {
1371         gchar *str;
1372         GSList *msglist;
1373         IMAPFolderItem *item;
1374 } TagsData;
1375
1376 static void imap_commit_tags(FolderItem *item, MsgInfo *msginfo, GSList *tags_set, GSList *tags_unset)
1377 {
1378         IMAPSession *session;
1379         gint ok, can_create_tags;
1380         Folder *folder = NULL;
1381         TagsData *ht_data = NULL;
1382         GSList *cur;
1383
1384         g_return_if_fail(item != NULL);
1385         g_return_if_fail(msginfo != NULL);
1386
1387         folder = item->folder;
1388         debug_print("getting session...\n");
1389         session = imap_session_get(folder);
1390
1391         if (!session) {
1392                 debug_print("can't get session\n");
1393                 return;
1394         }
1395
1396         ok = imap_select(session, IMAP_FOLDER(folder), item,
1397                          NULL, NULL, NULL, NULL, &can_create_tags, FALSE);
1398
1399         if (ok != MAILIMAP_NO_ERROR) {
1400                 return;
1401         }
1402
1403
1404         if (IMAP_FOLDER_ITEM(item)->can_create_flags != ITEM_CAN_CREATE_FLAGS)
1405                 return;
1406
1407         if (IMAP_FOLDER_ITEM(item)->batching) {
1408                 /* instead of performing an UID STORE command for each message change,
1409                  * as a lot of them can change "together", we just fill in hashtables
1410                  * and defer the treatment so that we're able to send only one
1411                  * command.
1412                  */
1413                 debug_print("IMAP batch mode on, deferring tags change\n");
1414                 for (cur = tags_set; cur; cur = cur->next) {
1415                         gint cur_tag = GPOINTER_TO_INT(cur->data);
1416                         if (cur_tag) {
1417                                 ht_data = g_hash_table_lookup(IMAP_FOLDER_ITEM(item)->tags_set_table,
1418                                         GINT_TO_POINTER(cur_tag));
1419                                 if (ht_data == NULL) {
1420                                         ht_data = g_new0(TagsData, 1);
1421                                         ht_data->str = g_strdup(tags_get_tag(cur_tag));
1422                                         ht_data->item = IMAP_FOLDER_ITEM(item);
1423                                         g_hash_table_insert(IMAP_FOLDER_ITEM(item)->tags_set_table,
1424                                                 GINT_TO_POINTER(cur_tag), ht_data);
1425                                 }
1426                                 ht_data->msglist = g_slist_prepend(ht_data->msglist, GINT_TO_POINTER(msginfo->msgnum));
1427                         }
1428                 }
1429                 for (cur = tags_unset; cur; cur = cur->next) {
1430                         gint cur_tag = GPOINTER_TO_INT(cur->data);
1431                         if (cur_tag) {
1432                                 ht_data = g_hash_table_lookup(IMAP_FOLDER_ITEM(item)->tags_unset_table,
1433                                         GINT_TO_POINTER(cur_tag));
1434                                 if (ht_data == NULL) {
1435                                         ht_data = g_new0(TagsData, 1);
1436                                         ht_data->str = g_strdup(tags_get_tag(cur_tag));
1437                                         ht_data->item = IMAP_FOLDER_ITEM(item);
1438                                         g_hash_table_insert(IMAP_FOLDER_ITEM(item)->tags_unset_table,
1439                                                 GINT_TO_POINTER(cur_tag), ht_data);
1440                                 }
1441                                 ht_data->msglist = g_slist_prepend(ht_data->msglist, GINT_TO_POINTER(msginfo->msgnum));
1442                         }
1443                 }
1444         } else {
1445                 GSList *list_set = NULL;
1446                 GSList *list_unset = NULL;
1447                 GSList numlist;
1448
1449                 numlist.data = GINT_TO_POINTER(msginfo->msgnum);
1450                 numlist.next = NULL;
1451
1452                 debug_print("IMAP changing tags NOW\n");
1453                 for (cur = tags_set; cur; cur = cur->next) {
1454                         gint cur_tag = GPOINTER_TO_INT(cur->data);
1455                         const gchar *str = tags_get_tag(cur_tag);
1456                         if (IS_NOT_RESERVED_TAG(str))
1457                                 list_set = g_slist_prepend(list_set, g_strdup(str));
1458                 }
1459                 if (list_set) {
1460                         ok = imap_set_message_flags(session,
1461                                 IMAP_FOLDER_ITEM(item), &numlist, 0, list_set, TRUE);
1462                         slist_free_strings_full(list_set);
1463                         if (ok != MAILIMAP_NO_ERROR) {
1464                                 return;
1465                         }
1466                 }
1467
1468                 for (cur = tags_unset; cur; cur = cur->next) {
1469                         gint cur_tag = GPOINTER_TO_INT(cur->data);
1470                         const gchar *str = tags_get_tag(cur_tag);
1471                         if (IS_NOT_RESERVED_TAG(str))
1472                                 list_unset = g_slist_prepend(list_unset, g_strdup(str));
1473                 }
1474                 if (list_unset) {
1475                         ok = imap_set_message_flags(session,
1476                                 IMAP_FOLDER_ITEM(item), &numlist, 0, list_unset, FALSE);
1477                         slist_free_strings_full(list_unset);
1478                         if (ok != MAILIMAP_NO_ERROR) {
1479                                 return;
1480                         }
1481                 }
1482         }
1483 }
1484
1485 static gchar *imap_fetch_msg_full(Folder *folder, FolderItem *item, gint uid,
1486                                   gboolean headers, gboolean body)
1487 {
1488         gchar *path, *filename;
1489         IMAPSession *session;
1490         gint ok;
1491
1492         g_return_val_if_fail(folder != NULL, NULL);
1493         g_return_val_if_fail(item != NULL, NULL);
1494
1495         if (uid == 0)
1496                 return NULL;
1497
1498         path = folder_item_get_path(item);
1499         if (!is_dir_exist(path)) {
1500                 if(is_file_exist(path))
1501                         claws_unlink(path);
1502                 make_dir_hier(path);
1503         }
1504         g_free(path);
1505
1506         filename = imap_get_cached_filename(item, uid);
1507         debug_print("trying to fetch cached %s\n", filename);
1508
1509         if (is_file_exist(filename)) {
1510                 /* see whether the local file represents the whole message
1511                  * or not. As the IMAP server reports size with \r chars,
1512                  * we have to update the local file (UNIX \n only) size */
1513                 MsgInfo *cached = msgcache_get_msg(item->cache,uid);
1514                 guint have_size = -1;
1515
1516                 if (cached)
1517                         debug_print("message %d has been already %scached.\n", uid,
1518                                 MSG_IS_FULLY_CACHED(cached->flags) ? "fully ":"");
1519
1520                 if (!cached || !MSG_IS_FULLY_CACHED(cached->flags)) {
1521                         have_size = get_file_size_with_crs(filename);
1522                         if (cached && (cached->size <= have_size || !body)) {
1523                                 ok = file_strip_crs(filename);
1524                                 if (ok == 0 && cached && cached->size <= have_size) {
1525                                         /* we have it all and stripped */
1526                                         debug_print("...fully cached in fact (%u/%zd); setting flag.\n",
1527                                                         have_size, cached->size);
1528                                         procmsg_msginfo_set_flags(cached, MSG_FULLY_CACHED, 0);
1529                                 }
1530                                 procmsg_msginfo_free(cached);
1531                                 return filename;
1532                         } else if (!cached && time(NULL) - get_file_mtime(filename) < 60) {
1533                                 debug_print("message not cached and file recent, considering file complete\n");
1534                                 ok = file_strip_crs(filename);
1535                                 if (ok == 0)
1536                                         return filename;
1537                         } else {
1538                                 procmsg_msginfo_free(cached);
1539                         }
1540                 }
1541                 if (cached && MSG_IS_FULLY_CACHED(cached->flags)) {
1542                         procmsg_msginfo_free(cached);
1543                         return filename;
1544                 }
1545         } else {
1546                 MsgInfo *cached = msgcache_get_msg(item->cache,uid);
1547                 if (cached) {
1548                         procmsg_msginfo_unset_flags(cached, MSG_FULLY_CACHED, 0);
1549                         procmsg_msginfo_free(cached);
1550                 }
1551         }
1552
1553         debug_print("getting session...\n");
1554         session = imap_session_get(folder);
1555
1556         if (!session) {
1557                 g_free(filename);
1558                 return NULL;
1559         }
1560         session_set_access_time(SESSION(session));
1561         lock_session(session); /* unlocked later in the function */
1562
1563         debug_print("IMAP fetching messages\n");
1564         ok = imap_select(session, IMAP_FOLDER(folder), item,
1565                          NULL, NULL, NULL, NULL, NULL, FALSE);
1566         if (ok != MAILIMAP_NO_ERROR) {
1567                 g_warning("can't select mailbox %s\n", item->path);
1568                 g_free(filename);
1569                 return NULL;
1570         }
1571
1572         session_set_access_time(SESSION(session));
1573
1574         debug_print("getting message %d...\n", uid);
1575         ok = imap_cmd_fetch(session, (guint32)uid, filename, headers, body);
1576
1577         if (ok != MAILIMAP_NO_ERROR) {
1578                 g_warning("can't fetch message %d\n", uid);
1579                 g_free(filename);
1580                 return NULL;
1581         }
1582
1583         session_set_access_time(SESSION(session));
1584         unlock_session(session);
1585
1586         ok = file_strip_crs(filename);
1587
1588         if (ok == 0 && headers && body) {
1589                 MsgInfo *cached = msgcache_get_msg(item->cache,uid);
1590                 if (cached) {
1591                         procmsg_msginfo_set_flags(cached, MSG_FULLY_CACHED, 0);
1592                         procmsg_msginfo_free(cached);
1593                 }
1594         } else if (ok == -1) {
1595                 MsgInfo *cached = msgcache_get_msg(item->cache,uid);
1596                 if (cached) {
1597                         procmsg_msginfo_unset_flags(cached, MSG_FULLY_CACHED, 0);
1598                         procmsg_msginfo_free(cached);
1599                 }
1600         }
1601         return filename;
1602 }
1603
1604 static gboolean imap_is_msg_fully_cached(Folder *folder, FolderItem *item, gint uid)
1605 {
1606         gchar *filename;
1607         guint size = 0;
1608         MsgInfo *cached = msgcache_get_msg(item->cache,uid);
1609
1610         if (!cached)
1611                 return FALSE;
1612
1613         if (MSG_IS_FULLY_CACHED(cached->flags)) {
1614                 procmsg_msginfo_free(cached);
1615                 return TRUE;
1616         }
1617
1618         filename = imap_get_cached_filename(item, uid);
1619
1620         if (is_file_exist(filename)) {
1621                 if (cached && cached->total_size == cached->size) {
1622                         /* fast path */
1623                         g_free(filename);
1624                         procmsg_msginfo_set_flags(cached, MSG_FULLY_CACHED, 0);
1625                         return TRUE;
1626                 }
1627                 size = get_file_size_with_crs(filename);
1628         }
1629         g_free(filename);
1630         debug_print("msg %d cached, has size %d, full should be %zd.\n", uid, size, cached->size);
1631         if (cached && size >= cached->size) {
1632                 cached->total_size = cached->size;
1633                 procmsg_msginfo_set_flags(cached, MSG_FULLY_CACHED, 0);
1634                 procmsg_msginfo_free(cached);
1635                 return TRUE;
1636         }
1637         if (cached)
1638                 procmsg_msginfo_free(cached);
1639         return FALSE;
1640 }
1641
1642 void imap_cache_msg(FolderItem *item, gint msgnum)
1643 {
1644         Folder *folder = NULL;
1645
1646         if (!item)
1647                 return;
1648         folder = item->folder;
1649
1650         if (!imap_is_msg_fully_cached(folder, item, msgnum)) {
1651                 gchar *tmp = imap_fetch_msg_full(folder, item, msgnum, TRUE, TRUE);
1652                 debug_print("fetched %s\n", tmp);
1653                 g_free(tmp);
1654         }
1655 }
1656
1657 static gint imap_add_msg(Folder *folder, FolderItem *dest,
1658                          const gchar *file, MsgFlags *flags)
1659 {
1660         gint ret;
1661         GSList file_list;
1662         MsgFileInfo fileinfo;
1663
1664         g_return_val_if_fail(file != NULL, -1);
1665
1666         fileinfo.msginfo = NULL;
1667         fileinfo.file = (gchar *)file;
1668         fileinfo.flags = flags;
1669         file_list.data = &fileinfo;
1670         file_list.next = NULL;
1671
1672         ret = imap_add_msgs(folder, dest, &file_list, NULL);
1673         return ret;
1674 }
1675
1676 static gint imap_add_msgs(Folder *folder, FolderItem *dest, GSList *file_list,
1677                    GHashTable *relation)
1678 {
1679         gchar *destdir;
1680         IMAPSession *session;
1681         guint32 last_uid = 0;
1682         GSList *cur;
1683         MsgFileInfo *fileinfo;
1684         gint ok = MAILIMAP_NO_ERROR;
1685         gint curnum = 0, total = 0;
1686         gboolean missing_uids = FALSE;
1687
1688         g_return_val_if_fail(folder != NULL, -1);
1689         g_return_val_if_fail(dest != NULL, -1);
1690         g_return_val_if_fail(file_list != NULL, -1);
1691
1692         debug_print("getting session...\n");
1693         session = imap_session_get(folder);
1694         if (!session) {
1695                 return -1;
1696         }
1697         destdir = imap_get_real_path(session, IMAP_FOLDER(folder), dest->path, &ok);
1698         if (is_fatal(ok)) {
1699                 g_free(destdir);
1700                 return -1;
1701         }
1702         statusbar_print_all(_("Adding messages..."));
1703         total = g_slist_length(file_list);
1704         for (cur = file_list; cur != NULL; cur = cur->next) {
1705                 IMAPFlags iflags = 0;
1706                 guint32 new_uid = 0;
1707                 gchar *real_file = NULL;
1708                 fileinfo = (MsgFileInfo *)cur->data;
1709
1710                 statusbar_progress_all(curnum, total, total < 10 ? 1:10);
1711                 curnum++;
1712
1713                 if (fileinfo->flags) {
1714                         if (MSG_IS_MARKED(*fileinfo->flags))
1715                                 iflags |= IMAP_FLAG_FLAGGED;
1716                         if (MSG_IS_REPLIED(*fileinfo->flags))
1717                                 iflags |= IMAP_FLAG_ANSWERED;
1718                         if (MSG_IS_FORWARDED(*fileinfo->flags))
1719                                 iflags |= IMAP_FLAG_FORWARDED;
1720                         if (MSG_IS_SPAM(*fileinfo->flags))
1721                                 iflags |= IMAP_FLAG_SPAM;
1722                         else
1723                                 iflags |= IMAP_FLAG_HAM;
1724                         if (!MSG_IS_UNREAD(*fileinfo->flags))
1725                                 iflags |= IMAP_FLAG_SEEN;
1726
1727                 }
1728
1729                 if (real_file == NULL)
1730                         real_file = g_strdup(fileinfo->file);
1731
1732                 if (folder_has_parent_of_type(dest, F_QUEUE) ||
1733                     folder_has_parent_of_type(dest, F_OUTBOX) ||
1734                     folder_has_parent_of_type(dest, F_DRAFT) ||
1735                     folder_has_parent_of_type(dest, F_TRASH))
1736                         iflags |= IMAP_FLAG_SEEN;
1737
1738                 ok = imap_cmd_append(session, IMAP_FOLDER_ITEM(dest), destdir, real_file, iflags,
1739                                      &new_uid);
1740
1741                 if (ok != MAILIMAP_NO_ERROR) {
1742                         g_warning("can't append message %s\n", real_file);
1743                         g_free(real_file);
1744                         g_free(destdir);
1745                         statusbar_progress_all(0,0,0);
1746                         statusbar_pop_all();
1747                         return -1;
1748                 } else {
1749                         debug_print("appended new message as %d\n", new_uid);
1750                         /* put the local file in the imapcache, so that we don't
1751                          * have to fetch it back later. */
1752
1753                         if (new_uid == 0) {
1754                                 missing_uids = TRUE;
1755                                 debug_print("Missing UID (0)\n");
1756                         }
1757                         if (new_uid > 0) {
1758                                 gchar *cache_path = folder_item_get_path(dest);
1759                                 if (!is_dir_exist(cache_path))
1760                                         make_dir_hier(cache_path);
1761                                 if (is_dir_exist(cache_path)) {
1762                                         gchar *cache_file = g_strconcat(
1763                                                 cache_path, G_DIR_SEPARATOR_S,
1764                                                 itos(new_uid), NULL);
1765                                         copy_file(real_file, cache_file, TRUE);
1766                                         debug_print("got UID %d, copied to cache: %s\n", new_uid, cache_file);
1767                                         g_free(cache_file);
1768                                 }
1769                                 g_free(cache_path);
1770                         }
1771                 }
1772
1773                 if (relation != NULL)
1774                         g_hash_table_insert(relation, fileinfo->msginfo != NULL ?
1775                                           (gpointer) fileinfo->msginfo : (gpointer) fileinfo,
1776                                           GINT_TO_POINTER(new_uid));
1777                 if (last_uid < new_uid) {
1778                         last_uid = new_uid;
1779                 }
1780
1781                 g_free(real_file);
1782         }
1783
1784         statusbar_progress_all(0,0,0);
1785         statusbar_pop_all();
1786
1787
1788         g_free(destdir);
1789
1790         imap_scan_required(folder, dest);
1791
1792         session = imap_session_get(folder);
1793         if (!session) {
1794                 return -1;
1795         }
1796         if (missing_uids) {
1797                 gint a;
1798                 ok = imap_select(session, IMAP_FOLDER(folder), dest,
1799                          &a, NULL, NULL, NULL, NULL, FALSE);
1800         }
1801         return last_uid;
1802 }
1803
1804 static GSList *flatten_mailimap_set(struct mailimap_set * set)
1805 {
1806         GSList *result = NULL;
1807         clistiter *list;
1808         guint32 start, end, t;
1809         GSList *cur;
1810
1811         if (!set || !set->set_list)
1812                 return NULL;
1813
1814         for (list = clist_begin(set->set_list); list; list = clist_next(list)) {
1815                 struct mailimap_set_item *item = (struct mailimap_set_item *)clist_content(list);
1816                 start = item->set_first;
1817                 end = item->set_last;
1818                 if (start <= end) {
1819                         for (t = start; t <= end; t++) {
1820                                 result = g_slist_prepend(result, GINT_TO_POINTER(t));
1821                         }
1822                 }
1823         }
1824         result = g_slist_reverse(result);
1825         if (debug_get_mode()) {
1826                 debug_print("flat imap set: ");
1827                 for (cur = result; cur; cur = cur->next) {
1828                         debug_print("%d ", GPOINTER_TO_INT(cur->data));
1829                 }
1830                 debug_print("\n");
1831         }
1832
1833         return result;
1834 }
1835 static gint imap_do_copy_msgs(Folder *folder, FolderItem *dest,
1836                               MsgInfoList *msglist, GHashTable *relation,
1837                               gboolean same_dest_ok)
1838 {
1839         FolderItem *src;
1840         gchar *destdir;
1841         GSList *seq_list, *cur;
1842         MsgInfo *msginfo;
1843         IMAPSession *session;
1844         gint ok = MAILIMAP_NO_ERROR;
1845         GHashTable *uid_hash;
1846         gint last_num = 0;
1847
1848         g_return_val_if_fail(folder != NULL, -1);
1849         g_return_val_if_fail(dest != NULL, -1);
1850         g_return_val_if_fail(msglist != NULL, -1);
1851
1852         debug_print("getting session...\n");
1853         session = imap_session_get(folder);
1854
1855         if (!session) {
1856                 return -1;
1857         }
1858
1859         msginfo = (MsgInfo *)msglist->data;
1860         src = msginfo->folder;
1861         if (!same_dest_ok && src == dest) {
1862                 g_warning("the src folder is identical to the dest.\n");
1863                 return -1;
1864         }
1865
1866         if (src->folder != dest->folder) {
1867                 GSList *infolist = NULL, *cur;
1868                 int res = -1;
1869                 for (cur = msglist; cur; cur = cur->next) {
1870                         msginfo = (MsgInfo *)cur->data;
1871                         MsgFileInfo *fileinfo = g_new0(MsgFileInfo, 1);
1872                         fileinfo->file = procmsg_get_message_file(msginfo);
1873                         fileinfo->flags = &(msginfo->flags);
1874                         infolist = g_slist_prepend(infolist, fileinfo);
1875                 }
1876                 infolist = g_slist_reverse(infolist);
1877                 res = folder_item_add_msgs(dest, infolist, FALSE);
1878                 for (cur = infolist; cur; cur = cur->next) {
1879                         MsgFileInfo *info = (MsgFileInfo *)cur->data;
1880                         g_free(info->file);
1881                         g_free(info);
1882                 }
1883                 g_slist_free(infolist);
1884                 return res;
1885         }
1886
1887         lock_session(session); /* unlocked later in the function */
1888
1889         ok = imap_select(session, IMAP_FOLDER(folder), msginfo->folder,
1890                          NULL, NULL, NULL, NULL, NULL, FALSE);
1891         if (ok != MAILIMAP_NO_ERROR) {
1892                 return ok;
1893         }
1894
1895         unlock_session(session);
1896
1897         destdir = imap_get_real_path(session, IMAP_FOLDER(folder), dest->path, &ok);
1898
1899         if (is_fatal(ok)) {
1900                 g_free(destdir);
1901                 return ok;
1902         }
1903
1904         seq_list = imap_get_lep_set_from_msglist(IMAP_FOLDER(folder), msglist);
1905         uid_hash = g_hash_table_new(g_direct_hash, g_direct_equal);
1906
1907         statusbar_print_all(_("Copying messages..."));
1908         for (cur = seq_list; cur != NULL; cur = g_slist_next(cur)) {
1909                 struct mailimap_set * seq_set;
1910                 struct mailimap_set * source = NULL;
1911                 struct mailimap_set * dest = NULL;
1912                 seq_set = cur->data;
1913
1914                 debug_print("Copying messages from %s to %s ...\n",
1915                             src->path, destdir);
1916
1917                 lock_session(session); /* unlocked later in the function */
1918                 ok = imap_cmd_copy(session, seq_set, destdir,
1919                         &source, &dest);
1920
1921                 if (is_fatal(ok)) {
1922                         session = NULL;
1923                 }
1924
1925                 if (ok == MAILIMAP_NO_ERROR) {
1926                         unlock_session(session);
1927                         if (relation && source && dest) {
1928                                 GSList *s_list = flatten_mailimap_set(source);
1929                                 GSList *d_list = flatten_mailimap_set(dest);
1930                                 GSList *s_cur, *d_cur;
1931                                 if (g_slist_length(s_list) == g_slist_length(d_list)) {
1932
1933                                         for (s_cur = s_list, d_cur = d_list;
1934                                              s_cur && d_cur;
1935                                              s_cur = s_cur->next, d_cur = d_cur->next) {
1936                                                 g_hash_table_insert(uid_hash, s_cur->data, d_cur->data);
1937                                         }
1938
1939                                 } else {
1940                                         debug_print("hhhmm, source list length != dest list length.\n");
1941                                 }
1942                                 g_slist_free(s_list);
1943                                 g_slist_free(d_list);
1944                         }
1945                 }
1946
1947
1948                 if (source)
1949                         mailimap_set_free(source);
1950                 if (dest)
1951                         mailimap_set_free(dest);
1952
1953                 if (ok != MAILIMAP_NO_ERROR) {
1954                         g_hash_table_destroy(uid_hash);
1955                         imap_lep_set_free(seq_list);
1956                         statusbar_pop_all();
1957                         return -1;
1958                 }
1959         }
1960
1961         for (cur = msglist; cur != NULL; cur = g_slist_next(cur)) {
1962                 MsgInfo *msginfo = (MsgInfo *)cur->data;
1963                 gpointer hashval;
1964
1965                 hashval = g_hash_table_lookup(uid_hash, GINT_TO_POINTER(msginfo->msgnum));
1966
1967                 if (hashval != NULL) {
1968                         gint num = GPOINTER_TO_INT(hashval);
1969                         g_hash_table_insert(relation, msginfo,
1970                                           GINT_TO_POINTER(num));
1971                         if (num > last_num)
1972                                 last_num = num;
1973                         debug_print("copied message %d as %d\n", msginfo->msgnum, num);
1974                         /* put the local file in the imapcache, so that we don't
1975                          * have to fetch it back later. */
1976                         if (num > 0) {
1977                                 gchar *cache_path = folder_item_get_path(msginfo->folder);
1978                                 gchar *real_file = g_strconcat(
1979                                         cache_path, G_DIR_SEPARATOR_S,
1980                                         itos(msginfo->msgnum), NULL);
1981                                 gchar *cache_file = NULL;
1982                                 g_free(cache_path);
1983                                 cache_path = folder_item_get_path(dest);
1984                                 cache_file = g_strconcat(
1985                                         cache_path, G_DIR_SEPARATOR_S,
1986                                         itos(num), NULL);
1987                                 if (!is_dir_exist(cache_path))
1988                                         make_dir_hier(cache_path);
1989                                 if (is_file_exist(real_file) && is_dir_exist(cache_path)) {
1990                                         copy_file(real_file, cache_file, TRUE);
1991                                         debug_print("copied to cache: %s\n", cache_file);
1992                                 }
1993                                 g_free(real_file);
1994                                 g_free(cache_file);
1995                                 g_free(cache_path);
1996                         }
1997                 } else
1998                         g_hash_table_insert(relation, msginfo,
1999                                           GINT_TO_POINTER(0));
2000         }
2001         statusbar_pop_all();
2002
2003         g_hash_table_destroy(uid_hash);
2004         imap_lep_set_free(seq_list);
2005
2006         g_free(destdir);
2007
2008         IMAP_FOLDER_ITEM(dest)->lastuid = 0;
2009         IMAP_FOLDER_ITEM(dest)->uid_next = 0;
2010         g_slist_free(IMAP_FOLDER_ITEM(dest)->uid_list);
2011         IMAP_FOLDER_ITEM(dest)->uid_list = NULL;
2012
2013         imap_scan_required(folder, dest);
2014         if (ok == MAILIMAP_NO_ERROR)
2015                 return last_num;
2016         else
2017                 return -1;
2018 }
2019
2020 static gint imap_copy_msg(Folder *folder, FolderItem *dest, MsgInfo *msginfo)
2021 {
2022         GSList msglist;
2023
2024         g_return_val_if_fail(msginfo != NULL, -1);
2025
2026         msglist.data = msginfo;
2027         msglist.next = NULL;
2028
2029         return imap_copy_msgs(folder, dest, &msglist, NULL);
2030 }
2031
2032 static gint imap_copy_msgs(Folder *folder, FolderItem *dest,
2033                     MsgInfoList *msglist, GHashTable *relation)
2034 {
2035         MsgInfo *msginfo;
2036         gint ret;
2037
2038         g_return_val_if_fail(folder != NULL, -1);
2039         g_return_val_if_fail(dest != NULL, -1);
2040         g_return_val_if_fail(msglist != NULL, -1);
2041
2042         msginfo = (MsgInfo *)msglist->data;
2043         g_return_val_if_fail(msginfo->folder != NULL, -1);
2044
2045         ret = imap_do_copy_msgs(folder, dest, msglist, relation, FALSE);
2046         return ret;
2047 }
2048
2049 static gboolean imap_matcher_type_is_local(gint matchertype)
2050 {
2051         switch (matchertype) {
2052         case MATCHCRITERIA_FROM:
2053         case MATCHCRITERIA_TO:
2054         case MATCHCRITERIA_CC:
2055         case MATCHCRITERIA_TO_OR_CC:
2056         case MATCHCRITERIA_SUBJECT:
2057         case MATCHCRITERIA_REFERENCES:
2058         case MATCHCRITERIA_INREPLYTO:
2059         case MATCHCRITERIA_AGE_GREATER:
2060         case MATCHCRITERIA_AGE_LOWER:
2061         case MATCHCRITERIA_FORWARDED:
2062         case MATCHCRITERIA_SPAM:
2063         case MATCHCRITERIA_UNREAD:
2064         case MATCHCRITERIA_NEW:
2065         case MATCHCRITERIA_MARKED:
2066         case MATCHCRITERIA_REPLIED:
2067         case MATCHCRITERIA_DELETED:
2068         case MATCHCRITERIA_SIZE_GREATER:
2069         case MATCHCRITERIA_SIZE_SMALLER:
2070         case MATCHCRITERIA_SIZE_EQUAL:
2071                 return TRUE;
2072         }
2073         return FALSE;
2074 }
2075
2076 static IMAPSearchKey* search_make_key(MatcherProp* match, gboolean* is_all)
2077 {
2078         if (match->matchtype == MATCHTYPE_MATCHCASE || match->matchtype == MATCHTYPE_MATCH) {
2079                 IMAPSearchKey* result = NULL;
2080                 gboolean invert = FALSE;
2081                 gint matchertype = match->criteria;
2082
2083                 if (is_all) {
2084                         *is_all = FALSE;
2085                 }
2086
2087                 switch (matchertype) {
2088                 case MATCHCRITERIA_NOT_NEW: invert = TRUE; matchertype = MATCHCRITERIA_NEW; break;
2089                 case MATCHCRITERIA_NOT_MARKED: invert = TRUE; matchertype = MATCHCRITERIA_MARKED; break;
2090                 case MATCHCRITERIA_NOT_FORWARDED: invert = TRUE; matchertype = MATCHCRITERIA_FORWARDED; break;
2091                 case MATCHCRITERIA_NOT_SPAM: invert = TRUE; matchertype = MATCHCRITERIA_SPAM; break;
2092                 case MATCHCRITERIA_NOT_SUBJECT: invert = TRUE; matchertype = MATCHCRITERIA_SUBJECT; break;
2093                 case MATCHCRITERIA_NOT_FROM: invert = TRUE; matchertype = MATCHCRITERIA_FROM; break;
2094                 case MATCHCRITERIA_NOT_TO: invert = TRUE; matchertype = MATCHCRITERIA_TO; break;
2095                 case MATCHCRITERIA_NOT_CC: invert = TRUE; matchertype = MATCHCRITERIA_CC; break;
2096                 case MATCHCRITERIA_NOT_REFERENCES: invert = TRUE; matchertype = MATCHCRITERIA_REFERENCES; break;
2097                 case MATCHCRITERIA_NOT_HEADER: invert = TRUE; matchertype = MATCHCRITERIA_HEADER; break;
2098                 case MATCHCRITERIA_NOT_TAG: invert = TRUE; matchertype = MATCHCRITERIA_TAG; break;
2099                 case MATCHCRITERIA_NOT_HEADERS_PART: invert = TRUE; matchertype = MATCHCRITERIA_HEADERS_PART; break;
2100                 case MATCHCRITERIA_NOT_HEADERS_CONT: invert = TRUE; matchertype = MATCHCRITERIA_HEADERS_CONT; break;
2101                 case MATCHCRITERIA_NOT_MESSAGE: invert = TRUE; matchertype = MATCHCRITERIA_MESSAGE; break;
2102                 case MATCHCRITERIA_NOT_BODY_PART: invert = TRUE; matchertype = MATCHCRITERIA_BODY_PART; break;
2103                 case MATCHCRITERIA_NOT_TO_AND_NOT_CC: invert = TRUE; matchertype = MATCHCRITERIA_TO_OR_CC; break;
2104                 case MATCHCRITERIA_NOT_INREPLYTO: invert = TRUE; matchertype = MATCHCRITERIA_INREPLYTO; break;
2105                 }
2106
2107                 /*
2108                  * this aborts conversion even for predicates understood by the following code.
2109                  * while that might seem wasteful, claws local search for information listed below
2110                  * has proven faster than IMAP search plus network roundtrips. once this changes,
2111                  * consider removing these exceptions.
2112                  */
2113                 if (imap_matcher_type_is_local(matchertype))
2114                         return NULL;
2115
2116                 /* the Message-ID header is also cached */
2117                 if (matchertype == MATCHCRITERIA_HEADER && g_strcmp0("Message-ID", match->header) == 0) {
2118                         return NULL;
2119                 }
2120
2121                 switch (matchertype) {
2122                 case MATCHCRITERIA_FORWARDED:
2123                         result = imap_search_new(IMAP_SEARCH_CRITERIA_TAG, NULL, RTAG_FORWARDED, 0);
2124                         break;
2125
2126                 case MATCHCRITERIA_SPAM:
2127                         result = imap_search_new(IMAP_SEARCH_CRITERIA_TAG, NULL, RTAG_JUNK, 0);
2128                         break;
2129
2130                 case MATCHCRITERIA_INREPLYTO:
2131                         result = imap_search_new(IMAP_SEARCH_CRITERIA_HEADER, "In-Reply-To", match->expr, 0);
2132                         break;
2133
2134                 case MATCHCRITERIA_REFERENCES:
2135                         result = imap_search_new(IMAP_SEARCH_CRITERIA_HEADER, "References", match->expr, 0);
2136                         break;
2137
2138                 case MATCHCRITERIA_TO_OR_CC:
2139                         result = imap_search_or(
2140                                         imap_search_new(IMAP_SEARCH_CRITERIA_TO, NULL, match->expr, 0),
2141                                         imap_search_new(IMAP_SEARCH_CRITERIA_CC, NULL, match->expr, 0)
2142                                         );
2143                         break;
2144
2145                 case MATCHCRITERIA_HEADERS_PART:
2146                 case MATCHCRITERIA_HEADERS_CONT:
2147                         result = imap_search_and(
2148                                         imap_search_not(imap_search_new(IMAP_SEARCH_CRITERIA_BODY, NULL, match->expr, 0)),
2149                                         imap_search_new(IMAP_SEARCH_CRITERIA_MESSAGE, NULL, match->expr, 0)
2150                                         );
2151                         break;
2152
2153                 case MATCHCRITERIA_SIZE_EQUAL:
2154                         result = imap_search_and(
2155                                         imap_search_not(imap_search_new(IMAP_SEARCH_CRITERIA_SIZE_SMALLER, NULL, NULL, match->value)),
2156                                         imap_search_not(imap_search_new(IMAP_SEARCH_CRITERIA_SIZE_GREATER, NULL, NULL, match->value))
2157                                         );
2158                         break;
2159
2160                 case MATCHCRITERIA_NOT_UNREAD:
2161                         result = imap_search_new(IMAP_SEARCH_CRITERIA_READ, NULL, NULL, 0);
2162                         break;
2163
2164                 case MATCHCRITERIA_UNREAD:
2165                         result = imap_search_new(IMAP_SEARCH_CRITERIA_UNREAD, NULL, NULL, 0);
2166                         break;
2167
2168                 case MATCHCRITERIA_NEW:
2169                         result = imap_search_new(IMAP_SEARCH_CRITERIA_NEW, NULL, NULL, 0);
2170                         break;
2171
2172                 case MATCHCRITERIA_MARKED:
2173                         result = imap_search_new(IMAP_SEARCH_CRITERIA_MARKED, NULL, NULL, 0);
2174                         break;
2175
2176                 case MATCHCRITERIA_DELETED:
2177                         result = imap_search_new(IMAP_SEARCH_CRITERIA_DELETED, NULL, NULL, 0);
2178                         break;
2179
2180                 case MATCHCRITERIA_REPLIED:
2181                         result = imap_search_new(IMAP_SEARCH_CRITERIA_REPLIED, NULL, NULL, 0);
2182                         break;
2183
2184                 case MATCHCRITERIA_TAG:
2185                         {
2186                                 gchar *tmp = imap_utf8_to_modified_utf7(match->expr, TRUE);
2187                                 result = imap_search_new(IMAP_SEARCH_CRITERIA_TAG, NULL, tmp, 0);
2188                                 g_free(tmp);
2189                         }
2190                         break;
2191
2192                 case MATCHCRITERIA_SUBJECT:
2193                         result = imap_search_new(IMAP_SEARCH_CRITERIA_SUBJECT, NULL, match->expr, 0);
2194                         break;
2195
2196                 case MATCHCRITERIA_FROM:
2197                         result = imap_search_new(IMAP_SEARCH_CRITERIA_FROM, NULL, match->expr, 0);
2198                         break;
2199
2200                 case MATCHCRITERIA_TO:
2201                         result = imap_search_new(IMAP_SEARCH_CRITERIA_TO, NULL, match->expr, 0);
2202                         break;
2203
2204                 case MATCHCRITERIA_CC:
2205                         result = imap_search_new(IMAP_SEARCH_CRITERIA_CC, NULL, match->expr, 0);
2206                         break;
2207
2208                 case MATCHCRITERIA_AGE_GREATER:
2209                         result = imap_search_new(IMAP_SEARCH_CRITERIA_AGE_GREATER, NULL, NULL, match->value);
2210                         break;
2211
2212                 case MATCHCRITERIA_AGE_LOWER:
2213                         result = imap_search_new(IMAP_SEARCH_CRITERIA_AGE_LOWER, NULL, NULL, match->value);
2214                         break;
2215
2216                 case MATCHCRITERIA_BODY_PART:
2217                         result = imap_search_new(IMAP_SEARCH_CRITERIA_BODY, NULL, match->expr, 0);
2218                         break;
2219
2220                 case MATCHCRITERIA_MESSAGE:
2221                         result = imap_search_new(IMAP_SEARCH_CRITERIA_MESSAGE, NULL, match->expr, 0);
2222                         break;
2223
2224                 case MATCHCRITERIA_HEADER:
2225                         result = imap_search_new(IMAP_SEARCH_CRITERIA_HEADER, match->header, match->expr, 0);
2226                         break;
2227
2228                 case MATCHCRITERIA_SIZE_GREATER:
2229                         result = imap_search_new(IMAP_SEARCH_CRITERIA_SIZE_GREATER, NULL, NULL, match->value);
2230                         break;
2231
2232                 case MATCHCRITERIA_SIZE_SMALLER:
2233                         result = imap_search_new(IMAP_SEARCH_CRITERIA_SIZE_SMALLER, NULL, NULL, match->value);
2234                         break;
2235
2236                 default:
2237                         result = imap_search_new(IMAP_SEARCH_CRITERIA_ALL, NULL, NULL, 0);
2238                         if (is_all) {
2239                                 *is_all = TRUE;
2240                         }
2241                         break;
2242                 }
2243
2244                 if (invert) {
2245                         result = imap_search_not(result);
2246                         if (is_all && *is_all) {
2247                                 *is_all = FALSE;
2248                         }
2249                 }
2250
2251                 return result;
2252         }
2253
2254         return NULL;
2255 }
2256
2257 static void imap_change_search_charset(IMAPFolder *folder)
2258 {
2259         /* If server supports charset in searches, but the last used one failed,
2260          * changed to the next preferred charset. If none are still available,
2261          * disable charset searches.
2262          * Charsets are tried in the following order:
2263          * UTF-8, locale's charset, UTF-7.
2264          */
2265
2266         if (folder->search_charset_supported) {
2267                 if (folder->search_charset && !strcmp(folder->search_charset, conv_get_locale_charset_str_no_utf8()))
2268                         folder->search_charset = "UTF-8";
2269                 else if (folder->search_charset && !strcmp(folder->search_charset, "UTF-8"))
2270                         folder->search_charset = "UTF-7";
2271                 else {
2272                         folder->search_charset = NULL;
2273                         folder->search_charset_supported = FALSE;
2274                 }
2275         }
2276 }
2277
2278 static MatcherProp *imap_matcher_prop_set_charset(IMAPFolder *folder,
2279                                                   MatcherProp *utf8_prop,
2280                                                   gchar **charset)
2281 {
2282         /* If the match is going to be done locally, or the criteria is on
2283          * tag (special-cased to modified-UTF-7), or the expression searched
2284          * is ASCII, don't bother converting.
2285          */
2286         if (imap_matcher_type_is_local(utf8_prop->criteria)
2287          || utf8_prop->criteria == MATCHCRITERIA_TAG
2288          || utf8_prop->criteria == MATCHCRITERIA_NOT_TAG
2289          || utf8_prop->expr == NULL
2290          || is_ascii_str(utf8_prop->expr))
2291                 return matcherprop_new(utf8_prop->criteria,
2292                                utf8_prop->header,
2293                                utf8_prop->matchtype,
2294                                utf8_prop->expr,
2295                                utf8_prop->value);
2296         else {
2297                 gchar *conv_expr = NULL;
2298
2299                 /* If the search is server-side and the server doesn't support
2300                  * searching with the charsets we handle, bail out.
2301                  */
2302                 if (folder->search_charset_supported == FALSE)
2303                         return NULL;
2304
2305                 /* Else, convert. */
2306                 if (*charset == NULL)
2307                         *charset = g_strdup(folder->search_charset);
2308
2309                 conv_expr = conv_codeset_strdup(utf8_prop->expr, CS_UTF_8, *charset);
2310
2311                 if (conv_expr == NULL)
2312                         conv_expr = g_strdup(utf8_prop->expr);
2313
2314                 return matcherprop_new(utf8_prop->criteria,
2315                                utf8_prop->header,
2316                                utf8_prop->matchtype,
2317                                conv_expr,
2318                                utf8_prop->value);
2319         }
2320 }
2321
2322 static gint     search_msgs             (Folder                 *folder,
2323                                          FolderItem             *container,
2324                                          MsgNumberList          **msgs,
2325                                          gboolean               *on_server,
2326                                          MatcherList            *predicate,
2327                                          SearchProgressNotify   progress_cb,
2328                                          gpointer               progress_data)
2329 {
2330         IMAPSearchKey* key = NULL;
2331         GSList* cur;
2332         int result = -1;
2333         clist* uidlist = NULL;
2334         gboolean server_filtering_useless = FALSE;
2335         IMAPSession *session;
2336         gchar *charset_to_use = NULL;
2337
2338         if (on_server == NULL || !*on_server) {
2339                 return folder_item_search_msgs_local(folder, container, msgs, on_server,
2340                                 predicate, progress_cb, progress_data);
2341         }
2342
2343         for (cur = predicate->matchers; cur != NULL; cur = cur->next) {
2344                 IMAPSearchKey* matcherPart = NULL;
2345                 MatcherProp* prop = (MatcherProp*) cur->data;
2346                 gboolean is_all;
2347                 MatcherProp *imap_prop = imap_matcher_prop_set_charset(IMAP_FOLDER(folder), prop, &charset_to_use);
2348
2349                 if (imap_prop == NULL) {
2350                         /* Couldn't convert matcherprop to IMAP - probably not ascii
2351                          * and server doesn't support the charsets we do. */
2352                          return -1;
2353                 }
2354
2355                 matcherPart = search_make_key(imap_prop, &is_all);
2356
2357                 matcherprop_free(imap_prop);
2358
2359                 if (on_server) {
2360                         *on_server &= matcherPart != NULL && prop->matchtype == MATCHTYPE_MATCHCASE;
2361                 }
2362
2363                 if (matcherPart) {
2364                         if (key == NULL) {
2365                                 key = matcherPart;
2366                                 server_filtering_useless = is_all;
2367                         } else if (predicate->bool_and) {
2368                                 key = imap_search_and(key, matcherPart);
2369                                 server_filtering_useless &= is_all;
2370                         } else {
2371                                 key = imap_search_or(key, matcherPart);
2372                                 server_filtering_useless |= is_all;
2373                         }
2374                 }
2375         }
2376
2377         if (server_filtering_useless) {
2378                 imap_search_free(key);
2379                 key = NULL;
2380         }
2381
2382         if (key == NULL && progress_cb != NULL) {
2383                 GSList* cur;
2384                 GSList* list;
2385                 int count = 0;
2386
2387                 progress_cb(progress_data, TRUE, 0, 0, container->total_msgs);
2388                 progress_cb(progress_data, TRUE, container->total_msgs, 0, container->total_msgs);
2389
2390                 list = folder_item_get_msg_list(container);
2391                 for (cur = list; cur != NULL; cur = cur->next) {
2392                         *msgs = g_slist_prepend(*msgs, GUINT_TO_POINTER(((MsgInfo*) cur->data)->msgnum));
2393                         count++;
2394                 }
2395                 procmsg_msg_list_free(list);
2396
2397                 *msgs = g_slist_reverse(*msgs);
2398
2399                 return count;
2400         }
2401
2402         session = imap_session_get(folder);
2403         if (!session) {
2404                 return -1;
2405         }
2406         result = imap_select(session, IMAP_FOLDER(folder), FOLDER_ITEM(container),
2407                          NULL, NULL, NULL, NULL, NULL, TRUE);
2408         if (result != MAILIMAP_NO_ERROR)
2409                 return -1;
2410
2411         if (progress_cb)
2412                 progress_cb(progress_data, TRUE, 0, 0, container->total_msgs);
2413         result = imap_threaded_search(folder, IMAP_SEARCH_TYPE_KEYED, key, charset_to_use, NULL, &uidlist);
2414         if (progress_cb)
2415                 progress_cb(progress_data, TRUE, container->total_msgs, 0, container->total_msgs);
2416
2417         if (result == MAILIMAP_NO_ERROR) {
2418                 gint result = 0;
2419
2420                 *msgs = imap_uid_list_from_lep(uidlist, &result);
2421
2422                 mailimap_search_result_free(uidlist);
2423
2424                 if (charset_to_use != NULL)
2425                         g_free(charset_to_use);
2426
2427                 return result;
2428         } else if (charset_to_use != NULL) {
2429                 /* If search failed and was on an 8-bit string, try the next
2430                  * available charset to search if there still are some.
2431                  */
2432                 g_free(charset_to_use);
2433
2434                 imap_change_search_charset(IMAP_FOLDER(folder));
2435                 if (IMAP_FOLDER(folder)->search_charset_supported)
2436                         return search_msgs(folder, container, msgs, on_server, predicate,
2437                                    progress_cb, progress_data);
2438                 else
2439                         return -1;
2440         } else {
2441                 return -1;
2442         }
2443 }
2444
2445
2446 static gint imap_do_remove_msgs(Folder *folder, FolderItem *dest,
2447                                 MsgInfoList *msglist, GHashTable *relation)
2448 {
2449         gchar *destdir, *dir;
2450         GSList *numlist = NULL, *cur;
2451         MsgInfo *msginfo;
2452         IMAPSession *session;
2453         gint ok = MAILIMAP_NO_ERROR;
2454
2455         g_return_val_if_fail(folder != NULL, -1);
2456         g_return_val_if_fail(dest != NULL, -1);
2457         g_return_val_if_fail(msglist != NULL, -1);
2458
2459         debug_print("getting session...\n");
2460         session = imap_session_get(folder);
2461         if (!session) {
2462                 return -1;
2463         }
2464
2465         lock_session(session); /* unlocked later in the function */
2466
2467         msginfo = (MsgInfo *)msglist->data;
2468
2469         ok = imap_select(session, IMAP_FOLDER(folder), msginfo->folder,
2470                          NULL, NULL, NULL, NULL, NULL, FALSE);
2471         if (ok != MAILIMAP_NO_ERROR) {
2472                 return ok;
2473         }
2474
2475         destdir = imap_get_real_path(session, IMAP_FOLDER(folder), dest->path, &ok);
2476         if (is_fatal(ok)) {
2477                 g_free(destdir);
2478                 return ok;
2479         }
2480         for (cur = msglist; cur; cur = cur->next) {
2481                 msginfo = (MsgInfo *)cur->data;
2482                 if (!MSG_IS_DELETED(msginfo->flags))
2483                         numlist = g_slist_prepend(numlist, GINT_TO_POINTER(msginfo->msgnum));
2484         }
2485         numlist = g_slist_reverse(numlist);
2486
2487         if (numlist != NULL) {
2488                 ok = imap_set_message_flags
2489                         (session, IMAP_FOLDER_ITEM(msginfo->folder), numlist, IMAP_FLAG_DELETED, NULL, TRUE);
2490                 if (ok != MAILIMAP_NO_ERROR) {
2491                         log_warning(LOG_PROTOCOL, _("can't set deleted flags\n"));
2492                         g_free(destdir);
2493                         return ok;
2494                 }
2495         } /* else we just need to expunge */
2496         ok = imap_cmd_expunge(session, folder->account->imap_use_trash);
2497         if (ok != MAILIMAP_NO_ERROR) {
2498                 log_warning(LOG_PROTOCOL, _("can't expunge\n"));
2499                 g_free(destdir);
2500                 return ok;
2501         }
2502
2503         session->folder_content_changed = TRUE;
2504         unlock_session(session);
2505
2506         dir = folder_item_get_path(msginfo->folder);
2507         if (is_dir_exist(dir)) {
2508                 for (cur = msglist; cur; cur = cur->next) {
2509                         msginfo = (MsgInfo *)cur->data;
2510                         remove_numbered_files(dir, msginfo->msgnum, msginfo->msgnum);
2511                 }
2512         }
2513         g_free(dir);
2514
2515         g_slist_free(numlist);
2516
2517         imap_scan_required(folder, dest);
2518
2519         g_free(destdir);
2520
2521         return 0;
2522 }
2523
2524 static gint imap_remove_msgs(Folder *folder, FolderItem *dest,
2525                     MsgInfoList *msglist, GHashTable *relation)
2526 {
2527         MsgInfo *msginfo;
2528
2529         g_return_val_if_fail(folder != NULL, -1);
2530         g_return_val_if_fail(dest != NULL, -1);
2531         if (msglist == NULL)
2532                 return 0;
2533
2534         msginfo = (MsgInfo *)msglist->data;
2535         g_return_val_if_fail(msginfo->folder != NULL, -1);
2536
2537         return imap_do_remove_msgs(folder, dest, msglist, relation);
2538 }
2539
2540 static gint imap_remove_all_msg(Folder *folder, FolderItem *item)
2541 {
2542         GSList *list = folder_item_get_msg_list(item);
2543         gint res = imap_remove_msgs(folder, item, list, NULL);
2544         procmsg_msg_list_free(list);
2545         return res;
2546 }
2547
2548 static gboolean imap_is_msg_changed(Folder *folder, FolderItem *item,
2549                                     MsgInfo *msginfo)
2550 {
2551         /* TODO: properly implement this method */
2552         return FALSE;
2553 }
2554
2555 static gint imap_close(Folder *folder, FolderItem *item)
2556 {
2557         return 0;
2558 }
2559
2560 static gint imap_scan_tree_real(Folder *folder, gboolean subs_only)
2561 {
2562         FolderItem *item = NULL;
2563         IMAPSession *session;
2564         gchar *root_folder = NULL;
2565
2566         g_return_val_if_fail(folder != NULL, -1);
2567         g_return_val_if_fail(folder->account != NULL, -1);
2568
2569         debug_print("getting session...\n");
2570         session = imap_session_get(folder);
2571         if (!session) {
2572                 if (!folder->node) {
2573                         folder_tree_destroy(folder);
2574                         item = folder_item_new(folder, folder->name, NULL);
2575                         item->folder = folder;
2576                         folder->node = item->node = g_node_new(item);
2577                 }
2578                 return -1;
2579         }
2580
2581         if (folder->account->imap_dir && *folder->account->imap_dir) {
2582                 gchar *real_path;
2583                 int r = MAILIMAP_NO_ERROR;
2584                 clist * lep_list;
2585
2586                 Xstrdup_a(root_folder, folder->account->imap_dir, {return -1;});
2587                 extract_quote(root_folder, '"');
2588                 subst_char(root_folder,
2589                            imap_get_path_separator(session, IMAP_FOLDER(folder),
2590                                                    root_folder, &r),
2591                            '/');
2592                 if (is_fatal(r))
2593                         return -1;
2594                 strtailchomp(root_folder, '/');
2595                 real_path = imap_get_real_path
2596                         (session, IMAP_FOLDER(folder), root_folder, &r);
2597                 if (is_fatal(r)) {
2598                         g_free(real_path);
2599                         return -1;
2600                 }
2601                 debug_print("IMAP root directory: %s\n", real_path);
2602
2603                 /* check if root directory exist */
2604
2605                 r = imap_threaded_list(session->folder, "", real_path,
2606                                        &lep_list);
2607
2608                 if (r != MAILIMAP_NO_ERROR)
2609                         imap_handle_error(SESSION(session), NULL, r);
2610
2611                 if ((r != MAILIMAP_NO_ERROR) || (clist_count(lep_list) == 0)) {
2612                         if (!folder->node) {
2613                                 item = folder_item_new(folder, folder->name, NULL);
2614                                 item->folder = folder;
2615                                 folder->node = item->node = g_node_new(item);
2616                         }
2617                         return -1;
2618                 }
2619                 mailimap_list_result_free(lep_list);
2620
2621                 g_free(real_path);
2622         }
2623
2624         if (folder->node)
2625                 item = FOLDER_ITEM(folder->node->data);
2626
2627         if (item && !item->path && root_folder) {
2628                 item->path = g_strdup(root_folder);
2629         }
2630
2631         if (!item || ((item->path || root_folder) &&
2632                       strcmp2(item->path, root_folder) != 0)) {
2633                 folder_tree_destroy(folder);
2634                 item = folder_item_new(folder, folder->name, root_folder);
2635                 item->folder = folder;
2636                 folder->node = item->node = g_node_new(item);
2637         }
2638
2639         imap_scan_tree_recursive(session, FOLDER_ITEM(folder->node->data), subs_only);
2640         imap_create_missing_folders(folder);
2641
2642         return 0;
2643 }
2644
2645 static gint imap_scan_tree(Folder *folder)
2646 {
2647         gboolean subs_only = FALSE;
2648         if (folder->account) {
2649                 debug_print(" scanning only subs %d\n", folder->account->imap_subsonly);
2650                 subs_only = folder->account->imap_subsonly;
2651         }
2652         return imap_scan_tree_real(folder, subs_only);
2653 }
2654
2655 static gint imap_scan_tree_recursive(IMAPSession *session, FolderItem *item, gboolean subs_only)
2656 {
2657         Folder *folder;
2658         IMAPFolder *imapfolder;
2659         FolderItem *new_item;
2660         GSList *item_list, *cur;
2661         GNode *node;
2662         gchar *real_path;
2663         gchar *wildcard_path;
2664         gchar separator;
2665         gchar wildcard[3];
2666         clist * lep_list;
2667         int r = MAILIMAP_NO_ERROR;
2668
2669         g_return_val_if_fail(item != NULL, -1);
2670         g_return_val_if_fail(item->folder != NULL, -1);
2671         g_return_val_if_fail(item->no_sub == FALSE, -1);
2672
2673         folder = item->folder;
2674         imapfolder = IMAP_FOLDER(folder);
2675
2676         separator = imap_get_path_separator(session, imapfolder, item->path, &r);
2677         if (is_fatal(r))
2678                 return r;
2679
2680         if (folder->ui_func)
2681                 folder->ui_func(folder, item, folder->ui_func_data);
2682
2683         if (item->path) {
2684                 wildcard[0] = separator;
2685                 wildcard[1] = '%';
2686                 wildcard[2] = '\0';
2687                 real_path = imap_get_real_path(session, imapfolder, item->path, &r);
2688                 if (is_fatal(r)) {
2689                         g_free(real_path);
2690                         return r;
2691                 }
2692         } else {
2693                 wildcard[0] = '%';
2694                 wildcard[1] = '\0';
2695                 real_path = g_strdup("");
2696         }
2697
2698         Xstrcat_a(wildcard_path, real_path, wildcard,
2699                   {g_free(real_path); return MAILIMAP_ERROR_BAD_STATE;});
2700         lep_list = NULL;
2701
2702         if (subs_only)
2703                 r = imap_threaded_lsub(folder, "", wildcard_path, &lep_list);
2704         else
2705                 r = imap_threaded_list(folder, "", wildcard_path, &lep_list);
2706
2707         if (r != MAILIMAP_NO_ERROR) {
2708                 imap_handle_error(SESSION(session), NULL, r);
2709                 item_list = NULL;
2710                 g_free(real_path);
2711                 return r;
2712         }
2713         else {
2714                 item_list = imap_list_from_lep(imapfolder,
2715                                                lep_list, real_path, FALSE);
2716                 mailimap_list_result_free(lep_list);
2717         }
2718
2719         g_free(real_path);
2720
2721         node = item->node->children;
2722         while (node != NULL) {
2723                 FolderItem *old_item = FOLDER_ITEM(node->data);
2724                 GNode *next = node->next;
2725
2726                 new_item = NULL;
2727                 for (cur = item_list; cur != NULL; cur = cur->next) {
2728                         FolderItem *cur_item = FOLDER_ITEM(cur->data);
2729                         if (!strcmp2(old_item->path, cur_item->path)) {
2730                                 new_item = cur_item;
2731                                 break;
2732                         }
2733                 }
2734                 if (!new_item) {
2735                         if (old_item && old_item->path && !strcasecmp(old_item->path, "INBOX")) {
2736                                 debug_print("not removing INBOX\n");
2737                         } else {
2738                                 debug_print("folder '%s' not found. removing...\n",
2739                                             old_item->path);
2740                                 folder_item_remove(old_item);
2741                         }
2742                 } else {
2743                         old_item->no_sub = new_item->no_sub;
2744                         old_item->no_select = new_item->no_select;
2745                         if (old_item->no_sub == TRUE && node->children) {
2746                                 debug_print("folder '%s' doesn't have "
2747                                             "subfolders. removing...\n",
2748                                             old_item->path);
2749                                 folder_item_remove_children(old_item);
2750                         }
2751                 }
2752
2753                 node = next;
2754         }
2755
2756         for (cur = item_list; cur != NULL; cur = cur->next) {
2757                 FolderItem *cur_item = FOLDER_ITEM(cur->data);
2758                 new_item = NULL;
2759
2760                 for (node = item->node->children; node != NULL;
2761                      node = node->next) {
2762                         if (!strcmp2(FOLDER_ITEM(node->data)->path,
2763                                      cur_item->path)) {
2764                                 new_item = FOLDER_ITEM(node->data);
2765                                 folder_item_destroy(cur_item);
2766                                 cur_item = NULL;
2767                                 break;
2768                         }
2769                 }
2770                 if (!new_item) {
2771                         new_item = cur_item;
2772                         debug_print("new folder '%s' found.\n", new_item->path);
2773                         folder_item_append(item, new_item);
2774                 }
2775
2776                 if (!strcasecmp(new_item->path, "INBOX")) {
2777                         new_item->stype = F_INBOX;
2778                         folder->inbox = new_item;
2779                 } else if (!folder_item_parent(item) || item->stype == F_INBOX) {
2780                         gchar *base;
2781
2782                         base = g_path_get_basename(new_item->path);
2783
2784                         if (!folder->outbox && !g_ascii_strcasecmp(base, "Sent")) {
2785                                 new_item->stype = F_OUTBOX;
2786                                 folder->outbox = new_item;
2787                         } else if (!folder->draft && (!g_ascii_strcasecmp(base, "Drafts") || !g_ascii_strcasecmp(base, "Draft"))) {
2788                                 new_item->stype = F_DRAFT;
2789                                 folder->draft = new_item;
2790                         } else if (!folder->queue && !g_ascii_strcasecmp(base, "Queue")) {
2791                                 new_item->stype = F_QUEUE;
2792                                 folder->queue = new_item;
2793                         } else if (!folder->trash && !g_ascii_strcasecmp(base, "Trash")) {
2794                                 new_item->stype = F_TRASH;
2795                                 folder->trash = new_item;
2796                         }
2797                         g_free(base);
2798                 }
2799
2800                 if (new_item->no_sub == FALSE)
2801                         imap_scan_tree_recursive(session, new_item, subs_only);
2802         }
2803
2804         g_slist_free(item_list);
2805
2806         return MAILIMAP_NO_ERROR;
2807 }
2808
2809 GList *imap_scan_subtree(Folder *folder, FolderItem *item, gboolean unsubs_only, gboolean recursive)
2810 {
2811         IMAPSession *session = imap_session_get(folder);
2812         gchar *real_path;
2813         gchar *wildcard_path;
2814         gchar separator;
2815         gchar wildcard[3];
2816         clist * lep_list;
2817         GSList *item_list = NULL, *cur;
2818         GList *child_list = NULL, *tmplist = NULL;
2819         GSList *sub_list = NULL;
2820         int r = MAILIMAP_NO_ERROR;
2821
2822         if (!session)
2823                 return NULL;
2824
2825         separator = imap_get_path_separator(session, IMAP_FOLDER(folder), item->path, &r);
2826         if (is_fatal(r))
2827                 return NULL;
2828
2829         if (item->path) {
2830                 wildcard[0] = separator;
2831                 wildcard[1] = '%';
2832                 wildcard[2] = '\0';
2833                 real_path = imap_get_real_path(session, IMAP_FOLDER(folder), item->path, &r);
2834                 if (is_fatal(r)) {
2835                         g_free(real_path);
2836                         return NULL;
2837                 }
2838         } else {
2839                 wildcard[0] = '%';
2840                 wildcard[1] = '\0';
2841                 real_path = g_strdup("");
2842         }
2843
2844         Xstrcat_a(wildcard_path, real_path, wildcard,
2845                   {g_free(real_path); return NULL;});
2846         lep_list = NULL;
2847
2848         if (unsubs_only)
2849                 statusbar_print_all(_("Looking for unsubscribed folders in %s..."),
2850                                 item->path?item->path:item->name);
2851         else
2852                 statusbar_print_all(_("Looking for subfolders of %s..."),
2853                                 item->path?item->path:item->name);
2854
2855         r = imap_threaded_list(folder, "", wildcard_path, &lep_list);
2856         if (r) {
2857                 g_free(real_path);
2858                 statusbar_pop_all();
2859                 return NULL;
2860         }
2861         item_list = imap_list_from_lep(IMAP_FOLDER(folder),
2862                                lep_list, real_path, FALSE);
2863         mailimap_list_result_free(lep_list);
2864
2865         for (cur = item_list; cur != NULL; cur = cur->next) {
2866                 FolderItem *cur_item = FOLDER_ITEM(cur->data);
2867                 if (recursive) {
2868                         tmplist = imap_scan_subtree(folder, cur_item,
2869                                         unsubs_only, recursive);
2870                         if (tmplist)
2871                                 child_list = g_list_concat(child_list, tmplist);
2872                 }
2873                 child_list = g_list_prepend(child_list,
2874                                 imap_get_real_path(session,
2875                                         IMAP_FOLDER(folder), cur_item->path, &r));
2876                 if (is_fatal(r)) {
2877                         g_free(real_path);
2878                         statusbar_pop_all();
2879                         return NULL;
2880                 }
2881                 folder_item_destroy(cur_item);
2882         }
2883         child_list = g_list_reverse(child_list);
2884         g_slist_free(item_list);
2885
2886         if (unsubs_only) {
2887                 r = imap_threaded_lsub(folder, "", wildcard_path, &lep_list);
2888                 if (r) {
2889                         g_free(real_path);
2890                         statusbar_pop_all();
2891                         return NULL;
2892                 }
2893                 sub_list = imap_list_from_lep(IMAP_FOLDER(folder),
2894                                        lep_list, real_path, FALSE);
2895                 mailimap_list_result_free(lep_list);
2896
2897                 for (cur = sub_list; cur != NULL; cur = cur->next) {
2898                         FolderItem *cur_item = FOLDER_ITEM(cur->data);
2899                         GList *oldlitem = NULL;
2900                         gchar *tmp = imap_get_real_path(session,
2901                                         IMAP_FOLDER(folder), cur_item->path, &r);
2902                         if (r) {
2903                                 g_free(real_path);
2904                                 statusbar_pop_all();
2905                                 g_free(tmp);
2906                                 return NULL;
2907                         }
2908                         folder_item_destroy(cur_item);
2909                         oldlitem = g_list_find_custom(
2910                                         child_list, tmp, (GCompareFunc)strcmp2);
2911                         if (oldlitem) {
2912                                 child_list = g_list_remove_link(child_list, oldlitem);
2913                                 g_free(oldlitem->data);
2914                                 g_list_free(oldlitem);
2915                         }
2916                         g_free(tmp);
2917                 }
2918         }
2919
2920         g_free(real_path);
2921         statusbar_pop_all();
2922
2923         return child_list;
2924 }
2925
2926 static gint imap_create_tree(Folder *folder)
2927 {
2928         g_return_val_if_fail(folder != NULL, -1);
2929         g_return_val_if_fail(folder->node != NULL, -1);
2930         g_return_val_if_fail(folder->node->data != NULL, -1);
2931         g_return_val_if_fail(folder->account != NULL, -1);
2932
2933         imap_scan_tree(folder);
2934         imap_create_missing_folders(folder);
2935
2936         return 0;
2937 }
2938
2939 static void imap_create_missing_folders(Folder *folder)
2940 {
2941         g_return_if_fail(folder != NULL);
2942
2943         if (!folder->inbox)
2944                 folder->inbox = imap_create_special_folder
2945                         (folder, F_INBOX, "INBOX");
2946         if (!folder->trash)
2947                 folder->trash = imap_create_special_folder
2948                         (folder, F_TRASH, "Trash");
2949         if (!folder->queue)
2950                 folder->queue = imap_create_special_folder
2951                         (folder, F_QUEUE, "Queue");
2952         if (!folder->outbox)
2953                 folder->outbox = imap_create_special_folder
2954                         (folder, F_OUTBOX, "Sent");
2955         if (!folder->draft)
2956                 folder->draft = imap_create_special_folder
2957                         (folder, F_DRAFT, "Drafts");
2958 }
2959
2960 static FolderItem *imap_create_special_folder(Folder *folder,
2961                                               SpecialFolderItemType stype,
2962                                               const gchar *name)
2963 {
2964         FolderItem *item;
2965         FolderItem *new_item;
2966
2967         g_return_val_if_fail(folder != NULL, NULL);
2968         g_return_val_if_fail(folder->node != NULL, NULL);
2969         g_return_val_if_fail(folder->node->data != NULL, NULL);
2970         g_return_val_if_fail(folder->account != NULL, NULL);
2971         g_return_val_if_fail(name != NULL, NULL);
2972
2973         item = FOLDER_ITEM(folder->node->data);
2974         new_item = imap_create_folder(folder, item, name);
2975
2976         if (!new_item) {
2977                 g_warning("Can't create '%s'\n", name);
2978                 if (!folder->inbox) return NULL;
2979
2980                 new_item = imap_create_folder(folder, folder->inbox, name);
2981                 if (!new_item)
2982                         g_warning("Can't create '%s' under INBOX\n", name);
2983                 else
2984                         new_item->stype = stype;
2985         } else
2986                 new_item->stype = stype;
2987
2988         return new_item;
2989 }
2990
2991 static gchar *imap_folder_get_path(Folder *folder)
2992 {
2993         gchar *folder_path;
2994
2995         g_return_val_if_fail(folder != NULL, NULL);
2996         g_return_val_if_fail(folder->account != NULL, NULL);
2997
2998         folder_path = g_strconcat(get_imap_cache_dir(),
2999                                   G_DIR_SEPARATOR_S,
3000                                   folder->account->recv_server,
3001                                   G_DIR_SEPARATOR_S,
3002                                   folder->account->userid,
3003                                   NULL);
3004
3005         return folder_path;
3006 }
3007
3008 #ifdef G_OS_WIN32
3009 static gchar *imap_encode_unsafe_chars(const gchar *str)
3010 {
3011         gchar *ret = NULL, *o_ret;
3012         gchar *i;
3013         if (!str)
3014                 return NULL;
3015         ret = g_malloc(3*strlen(str)+1);
3016         o_ret = ret;
3017         for (i = str; *i; i++) {
3018                 switch(*i) {
3019                         case ':':
3020                         case '|':
3021                         case '<':
3022                         case '>':
3023                         case '*':
3024                         case '?':
3025                         case '#':
3026                                 *ret++ = '%';
3027                                 *ret++ = '0'+(*i/10);
3028                                 *ret++ = '0'+(*i%10);
3029                                 break;
3030                         default:
3031                                 *ret++ = *i;
3032                 }
3033         }
3034         *ret++ = '\0';
3035         return o_ret;
3036 }
3037 #endif
3038 static gchar *imap_item_get_path(Folder *folder, FolderItem *item)
3039 {
3040         gchar *folder_path, *path;
3041         gchar *item_path = NULL;
3042
3043         g_return_val_if_fail(folder != NULL, NULL);
3044         g_return_val_if_fail(item != NULL, NULL);
3045         folder_path = imap_folder_get_path(folder);
3046
3047         g_return_val_if_fail(folder_path != NULL, NULL);
3048
3049 #ifdef G_OS_UNIX
3050         item_path = g_strdup(item->path);
3051 #else
3052         item_path = imap_encode_unsafe_chars(item->path);
3053 #endif
3054
3055         if (g_path_is_absolute(folder_path)) {
3056                 if (item_path)
3057                         path = g_strconcat(folder_path, G_DIR_SEPARATOR_S,
3058                                            item_path, NULL);
3059                 else
3060                         path = g_strdup(folder_path);
3061         } else {
3062                 if (item_path)
3063                         path = g_strconcat(get_home_dir(), G_DIR_SEPARATOR_S,
3064                                            folder_path, G_DIR_SEPARATOR_S,
3065                                            item_path, NULL);
3066                 else
3067                         path = g_strconcat(get_home_dir(), G_DIR_SEPARATOR_S,
3068                                            folder_path, NULL);
3069         }
3070         g_free(folder_path);
3071         g_free(item_path);
3072 #ifdef G_OS_WIN32
3073         while (strchr(path, '/'))
3074                 *strchr(path, '/') = '\\';
3075 #endif
3076
3077         return path;
3078 }
3079
3080 static FolderItem *imap_create_folder(Folder *folder, FolderItem *parent,
3081                                const gchar *name)
3082 {
3083         gchar *dirpath, *imap_path;
3084         IMAPSession *session;
3085         FolderItem *new_item;
3086         gchar separator;
3087         gchar *new_name;
3088         const gchar *p;
3089         gint ok = MAILIMAP_NO_ERROR;
3090         gboolean no_select = FALSE, no_sub = FALSE;
3091         gboolean exist = FALSE;
3092
3093         g_return_val_if_fail(folder != NULL, NULL);
3094         g_return_val_if_fail(folder->account != NULL, NULL);
3095         g_return_val_if_fail(parent != NULL, NULL);
3096         g_return_val_if_fail(name != NULL, NULL);
3097
3098         if (to_number(name) > 0) {
3099                 gchar *cached_msg = imap_get_cached_filename(parent, to_number(name));
3100                 if (is_file_exist(cached_msg)) {
3101                         if (claws_unlink(cached_msg) != 0) {
3102                                 return NULL;
3103                         }
3104                 }
3105         }
3106
3107         debug_print("getting session...\n");
3108         session = imap_session_get(folder);
3109         if (!session) {
3110                 return NULL;
3111         }
3112
3113         if (!folder_item_parent(parent) && strcasecmp(name, "INBOX") == 0) {
3114                 dirpath = g_strdup(name);
3115         }else if (parent->path)
3116                 dirpath = g_strconcat(parent->path, "/", name, NULL);
3117         else if ((p = strchr(name, '/')) != NULL && *(p + 1) != '\0')
3118                 dirpath = g_strdup(name);
3119         else if (folder->account->imap_dir && *folder->account->imap_dir) {
3120                 gchar *imap_dir;
3121
3122                 Xstrdup_a(imap_dir, folder->account->imap_dir, {return NULL;});
3123                 strtailchomp(imap_dir, '/');
3124                 dirpath = g_strconcat(imap_dir, "/", name, NULL);
3125         } else
3126                 dirpath = g_strdup(name);
3127
3128
3129
3130         /* keep trailing directory separator to create a folder that contains
3131            sub folder */
3132         imap_path = imap_utf8_to_modified_utf7(dirpath, FALSE);
3133
3134         strtailchomp(dirpath, '/');
3135         Xstrdup_a(new_name, name, {
3136                 g_free(dirpath);
3137                 g_free(imap_path);
3138                 return NULL;});
3139
3140         separator = imap_get_path_separator(session, IMAP_FOLDER(folder), imap_path, &ok);
3141         if (is_fatal(ok)) {
3142                 g_free(imap_path);
3143                 return NULL;
3144         }
3145         imap_path_separator_subst(imap_path, separator);
3146         /* remove trailing / for display */
3147         strtailchomp(new_name, '/');
3148
3149         if (strcasecmp(dirpath, "INBOX") != 0) {
3150                 GPtrArray *argbuf;
3151                 int r;
3152                 clist * lep_list;
3153
3154                 argbuf = g_ptr_array_new();
3155                 r = imap_threaded_list(folder, "", imap_path, &lep_list);
3156                 if (r != MAILIMAP_NO_ERROR) {
3157                         imap_handle_error(SESSION(session), NULL, r);
3158                         log_warning(LOG_PROTOCOL, _("can't create mailbox: LIST failed\n"));
3159                         g_free(imap_path);
3160                         g_free(dirpath);
3161                         ptr_array_free_strings(argbuf);
3162                         g_ptr_array_free(argbuf, TRUE);
3163                         return NULL;
3164                 }
3165
3166                 if (clist_count(lep_list) > 0)
3167                         exist = TRUE;
3168                 mailimap_list_result_free(lep_list);
3169                 lep_list = NULL;
3170                 if (!exist) {
3171                         ok = imap_cmd_create(session, imap_path);
3172                         if (ok != MAILIMAP_NO_ERROR) {
3173                                 log_warning(LOG_PROTOCOL, _("can't create mailbox\n"));
3174                                 g_free(imap_path);
3175                                 g_free(dirpath);
3176                                 return NULL;
3177                         }
3178                         r = imap_threaded_list(folder, "", imap_path, &lep_list);
3179                         if (r == MAILIMAP_NO_ERROR) {
3180                                 GSList *item_list = imap_list_from_lep(IMAP_FOLDER(folder),
3181                                                lep_list, dirpath, TRUE);
3182                                 if (item_list) {
3183                                         FolderItem *cur_item = FOLDER_ITEM(item_list->data);
3184                                         no_select = cur_item->no_select;
3185                                         no_sub = cur_item->no_sub;
3186                                         g_slist_free(item_list);
3187                                 }
3188                                 mailimap_list_result_free(lep_list);
3189                         } else {
3190                                 imap_handle_error(SESSION(session), NULL, r);
3191                         }
3192                 }
3193                 imap_threaded_subscribe(folder, imap_path, TRUE);
3194         } else {
3195                 clist *lep_list;
3196                 int r;
3197                 /* just get flags */
3198                 r = imap_threaded_list(folder, "", "INBOX", &lep_list);
3199                 if (r == MAILIMAP_NO_ERROR) {
3200                         GSList *item_list = imap_list_from_lep(IMAP_FOLDER(folder),
3201                                        lep_list, dirpath, TRUE);
3202                         if (item_list) {
3203                                 FolderItem *cur_item = FOLDER_ITEM(item_list->data);
3204                                 no_select = cur_item->no_select;
3205                                 no_sub = cur_item->no_sub;
3206                                 g_slist_free(item_list);
3207                         }
3208                         mailimap_list_result_free(lep_list);
3209                 } else {
3210                         imap_handle_error(SESSION(session), NULL, r);
3211                 }
3212         }
3213
3214         new_item = folder_item_new(folder, new_name, dirpath);
3215         new_item->no_select = no_select;
3216         new_item->no_sub = no_sub;
3217         folder_item_append(parent, new_item);
3218         g_free(imap_path);
3219         g_free(dirpath);
3220
3221         dirpath = folder_item_get_path(new_item);
3222         if (!is_dir_exist(dirpath))
3223                 make_dir_hier(dirpath);
3224         g_free(dirpath);
3225
3226         if (exist) {
3227                 /* folder existed, scan it */
3228                 imap_scan_required(folder, new_item);
3229                 folder_item_scan_full(new_item, FALSE);
3230         }
3231
3232         return new_item;
3233 }
3234
3235 static gint imap_rename_folder(Folder *folder, FolderItem *item,
3236                                const gchar *name)
3237 {
3238         gchar *dirpath;
3239         gchar *newpath;
3240         gchar *real_oldpath;
3241         gchar *real_newpath;
3242         gchar *paths[2];
3243         gchar *old_cache_dir;
3244         gchar *new_cache_dir;
3245         IMAPSession *session;
3246         gchar separator;
3247         gint ok = MAILIMAP_NO_ERROR;
3248         gint exists, recent, unseen;
3249         guint32 uid_validity;
3250
3251         g_return_val_if_fail(folder != NULL, -1);
3252         g_return_val_if_fail(item != NULL, -1);
3253         g_return_val_if_fail(item->path != NULL, -1);
3254         g_return_val_if_fail(name != NULL, -1);
3255
3256         debug_print("getting session...\n");
3257         session = imap_session_get(folder);
3258         if (!session) {
3259                 return -1;
3260         }
3261
3262         if (strchr(name, imap_get_path_separator(session, IMAP_FOLDER(folder), item->path, &ok)) != NULL ||
3263                 is_fatal(ok)) {
3264                 g_warning(_("New folder name must not contain the namespace "
3265                             "path separator"));
3266                 return -1;
3267         }
3268
3269         real_oldpath = imap_get_real_path(session, IMAP_FOLDER(folder), item->path, &ok);
3270         if (is_fatal(ok)) {
3271                 g_free(real_oldpath);
3272                 return -1;
3273         }
3274
3275         g_free(session->mbox);
3276         session->mbox = NULL;
3277         session->exists = 0;
3278         session->recent = 0;
3279         session->expunge = 0;
3280         ok = imap_cmd_examine(session, "INBOX",
3281                               &exists, &recent, &unseen, &uid_validity, FALSE);
3282         if (ok != MAILIMAP_NO_ERROR) {
3283                 g_free(real_oldpath);
3284                 return -1;
3285         }
3286
3287         separator = imap_get_path_separator(session, IMAP_FOLDER(folder), item->path, &ok);
3288         if (is_fatal(ok)) {
3289                 g_free(real_oldpath);
3290                 return -1;
3291         }
3292         if (strchr(item->path, G_DIR_SEPARATOR)) {
3293                 dirpath = g_path_get_dirname(item->path);
3294                 newpath = g_strconcat(dirpath, G_DIR_SEPARATOR_S, name, NULL);
3295                 g_free(dirpath);
3296         } else
3297                 newpath = g_strdup(name);
3298
3299         real_newpath = imap_utf8_to_modified_utf7(newpath, FALSE);
3300         imap_path_separator_subst(real_newpath, separator);
3301
3302         ok = imap_cmd_rename(session, real_oldpath, real_newpath);
3303         if (ok != MAILIMAP_NO_ERROR) {
3304                 log_warning(LOG_PROTOCOL, _("can't rename mailbox: %s to %s\n"),
3305                             real_oldpath, real_newpath);
3306                 g_free(real_oldpath);
3307                 g_free(newpath);
3308                 g_free(real_newpath);
3309                 return -1;
3310         }
3311         g_free(item->name);
3312         item->name = g_strdup(name);
3313
3314         old_cache_dir = folder_item_get_path(item);
3315
3316         paths[0] = g_strdup(item->path);
3317         paths[1] = newpath;
3318         g_node_traverse(item->node, G_PRE_ORDER, G_TRAVERSE_ALL, -1,
3319                         imap_rename_folder_func, paths);
3320
3321         if (is_dir_exist(old_cache_dir)) {
3322                 new_cache_dir = folder_item_get_path(item);
3323                 if (g_rename(old_cache_dir, new_cache_dir) < 0) {
3324                         FILE_OP_ERROR(old_cache_dir, "rename");
3325                 }
3326                 g_free(new_cache_dir);
3327         }
3328
3329         g_free(old_cache_dir);
3330         g_free(paths[0]);
3331         g_free(newpath);
3332         g_free(real_oldpath);
3333         g_free(real_newpath);
3334         return 0;
3335 }
3336
3337 gint imap_subscribe(Folder *folder, FolderItem *item, gchar *rpath, gboolean sub)
3338 {
3339         gchar *path;
3340         gint r = MAILIMAP_NO_ERROR;
3341         IMAPSession *session;
3342         debug_print("getting session...\n");
3343
3344         session = imap_session_get(folder);
3345         if (!session) {
3346                 return -1;
3347         }
3348         if (item && item->path) {
3349                 path = imap_get_real_path(session, IMAP_FOLDER(folder), item->path, &r);
3350                 if (!path)
3351                         return -1;
3352                 if (is_fatal(r)) {
3353                         g_free(path);
3354                         return -1;
3355                 }
3356                 if (!strcasecmp(path, "INBOX") && sub == FALSE) {
3357                         g_free(path);
3358                         return -1;
3359                 }
3360                 debug_print("%ssubscribing %s\n", sub?"":"un", path);
3361                 r = imap_threaded_subscribe(folder, path, sub);
3362                 g_free(path);
3363         } else if (rpath) {
3364                 r = imap_threaded_subscribe(folder, rpath, sub);
3365         } else
3366                 return -1;
3367         return r;
3368 }
3369
3370 static gint imap_remove_folder_real(Folder *folder, FolderItem *item)
3371 {
3372         gint ok = MAILIMAP_NO_ERROR;
3373         IMAPSession *session;
3374         gchar *path;
3375         gchar *cache_dir;
3376         gboolean selected_folder;
3377
3378         g_return_val_if_fail(folder != NULL, -1);
3379         g_return_val_if_fail(item != NULL, -1);
3380         g_return_val_if_fail(item->path != NULL, -1);
3381
3382         debug_print("getting session...\n");
3383         session = imap_session_get(folder);
3384         if (!session) {
3385                 return -1;
3386         }
3387         path = imap_get_real_path(session, IMAP_FOLDER(folder), item->path, &ok);
3388         if (is_fatal(ok)) {
3389                 g_free(path);
3390                 return -1;
3391         }
3392         imap_threaded_subscribe(folder, path, FALSE);
3393
3394         selected_folder = (session->mbox != NULL) &&
3395                           (!strcmp(session->mbox, item->path));
3396         if (selected_folder) {
3397                 ok = imap_cmd_close(session);
3398                 if (ok != MAILIMAP_NO_ERROR) {
3399                         debug_print("close err %d\n", ok);
3400                         return ok;
3401                 }
3402         }
3403         ok = imap_cmd_delete(session, path);
3404         if (ok != MAILIMAP_NO_ERROR && !is_fatal(ok)) {
3405                 gchar *tmp = NULL;
3406
3407                 ok = MAILIMAP_NO_ERROR;
3408                 tmp = g_strdup_printf("%s%c", path,
3409                                 imap_get_path_separator(session, IMAP_FOLDER(folder), path, &ok));
3410                 g_free(path);
3411                 path = tmp;
3412                 if (!is_fatal(ok))
3413                         ok = imap_cmd_delete(session, path);
3414         }
3415
3416         if (ok != MAILIMAP_NO_ERROR) {
3417                 log_warning(LOG_PROTOCOL, _("can't delete mailbox\n"));
3418                 g_free(path);
3419                 return -1;
3420         }
3421
3422         g_free(path);
3423         cache_dir = folder_item_get_path(item);
3424         if (is_dir_exist(cache_dir) && remove_dir_recursive(cache_dir) < 0)
3425                 g_warning("can't remove directory '%s'\n", cache_dir);
3426         g_free(cache_dir);
3427         folder_item_remove(item);
3428         return 0;
3429 }
3430
3431 static gint imap_remove_folder(Folder *folder, FolderItem *item)
3432 {
3433         GNode *node, *next;
3434
3435         g_return_val_if_fail(item != NULL, -1);
3436         g_return_val_if_fail(item->folder != NULL, -1);
3437         g_return_val_if_fail(item->node != NULL, -1);
3438
3439         node = item->node->children;
3440         while (node != NULL) {
3441                 next = node->next;
3442                 if (imap_remove_folder(folder, FOLDER_ITEM(node->data)) < 0)
3443                         return -1;
3444                 node = next;
3445         }
3446         debug_print("IMAP removing %s\n", item->path);
3447
3448         if (imap_remove_all_msg(folder, item) < 0)
3449                 return -1;
3450         return imap_remove_folder_real(folder, item);
3451 }
3452
3453 typedef struct _uncached_data {
3454         IMAPSession *session;
3455         FolderItem *item;
3456         MsgNumberList *numlist;
3457         guint cur;
3458         guint total;
3459         gboolean done;
3460         int ok;
3461 } uncached_data;
3462
3463 static void *imap_get_uncached_messages_thread(void *data)
3464 {
3465         uncached_data *stuff = (uncached_data *)data;
3466         IMAPSession *session = stuff->session;
3467         FolderItem *item = stuff->item;
3468         MsgNumberList *numlist = stuff->numlist;
3469         GSList *newlist = NULL;
3470         GSList *llast = NULL;
3471         GSList *seq_list, *cur;
3472         gboolean got_alien_tags = FALSE;
3473
3474         debug_print("uncached_messages\n");
3475
3476         if (session == NULL || item == NULL || item->folder == NULL
3477             || FOLDER_CLASS(item->folder) != &imap_class) {
3478                 stuff->done = TRUE;
3479                 return NULL;
3480         }
3481
3482         seq_list = imap_get_lep_set_from_numlist(IMAP_FOLDER(item->folder), numlist);
3483         debug_print("get msgs info\n");
3484         for (cur = seq_list; cur != NULL; cur = g_slist_next(cur)) {
3485                 struct mailimap_set * imapset;
3486                 unsigned int i;
3487                 int r;
3488                 carray * env_list;
3489                 int count;
3490
3491                 if (session->cancelled)
3492                         break;
3493
3494                 imapset = cur->data;
3495
3496                 r = imap_threaded_fetch_env(session->folder,
3497                                             imapset, &env_list);
3498                 if (r != MAILIMAP_NO_ERROR) {
3499                         imap_handle_error(SESSION(session), NULL, r);
3500                         if (is_fatal(r)) {
3501                                 stuff->ok = r;
3502                                 return NULL;
3503                         }
3504                         continue;
3505                 }
3506
3507                 session_set_access_time(SESSION(session));
3508
3509                 count = 0;
3510                 for(i = 0 ; i < carray_count(env_list) ; i += 2) {
3511                         struct imap_fetch_env_info * info;
3512                         MsgInfo * msginfo;
3513                         GSList *tags = NULL, *cur = NULL;
3514                         info = carray_get(env_list, i);
3515                         tags = carray_get(env_list, i+1);
3516                         msginfo = imap_envelope_from_lep(info, item);
3517                         if (msginfo == NULL) {
3518                                 slist_free_strings_full(tags);
3519                                 continue;
3520                         }
3521                         g_slist_free(msginfo->tags);
3522                         msginfo->tags = NULL;
3523
3524                         for (cur = tags; cur; cur = cur->next) {
3525                                 gchar *real_tag = imap_modified_utf7_to_utf8(cur->data, TRUE);
3526                                 gint id = 0;
3527                                 id = tags_get_id_for_str(real_tag);
3528                                 if (id == -1) {
3529                                         id = tags_add_tag(real_tag);
3530                                         got_alien_tags = TRUE;
3531                                 }
3532                                 if (!g_slist_find(msginfo->tags, GINT_TO_POINTER(id))) {
3533                                         msginfo->tags = g_slist_prepend(
3534                                                         msginfo->tags,
3535                                                         GINT_TO_POINTER(id));
3536                                 }
3537                                 g_free(real_tag);
3538                         }
3539                         if (msginfo->tags)
3540                                 msginfo->tags = g_slist_reverse(msginfo->tags);
3541                         slist_free_strings_full(tags);
3542                         msginfo->folder = item;
3543                         if (!newlist)
3544                                 llast = newlist = g_slist_append(newlist, msginfo);
3545                         else {
3546                                 llast = g_slist_append(llast, msginfo);
3547                                 llast = llast->next;
3548                         }
3549                         count ++;
3550                 }
3551
3552                 imap_fetch_env_free(env_list);
3553         }
3554
3555         if (got_alien_tags) {
3556                 tags_write_tags();
3557                 main_window_reflect_tags_changes(mainwindow_get_mainwindow());
3558         }
3559
3560         imap_lep_set_free(seq_list);
3561
3562         session_set_access_time(SESSION(session));
3563         stuff->done = TRUE;
3564         return newlist;
3565 }
3566
3567 #define MAX_MSG_NUM 50
3568
3569 static GSList *imap_get_uncached_messages(IMAPSession *session,
3570                                         FolderItem *item,
3571                                         MsgNumberList *numlist,
3572                                         int *r)
3573 {
3574         GSList *result = NULL;
3575         GSList * cur;
3576         uncached_data *data = g_new0(uncached_data, 1);
3577
3578         cur = numlist;
3579         data->total = g_slist_length(numlist);
3580         data->ok = MAILIMAP_NO_ERROR;
3581         debug_print("messages list : %i\n", data->total);
3582
3583         while (cur != NULL) {
3584                 GSList * partial_result;
3585                 int count;
3586                 GSList * newlist;
3587                 GSList * llast;
3588
3589                 llast = NULL;
3590                 count = 0;
3591                 newlist = NULL;
3592                 while (count < MAX_MSG_NUM) {
3593                         void * p;
3594
3595                         p = cur->data;
3596
3597                         if (newlist == NULL)
3598                                 llast = newlist = g_slist_append(newlist, p);
3599                         else {
3600                                 llast = g_slist_append(llast, p);
3601                                 llast = llast->next;
3602                         }
3603                         count ++;
3604
3605                         cur = cur->next;
3606                         if (cur == NULL)
3607                                 break;
3608                 }
3609
3610                 data->done = FALSE;
3611                 data->session = session;
3612                 data->item = item;
3613                 data->numlist = newlist;
3614                 data->cur += count;
3615
3616                 if (prefs_common.work_offline &&
3617                     !inc_offline_should_override(FALSE,
3618                         _("Claws Mail needs network access in order "
3619                           "to access the IMAP server."))) {
3620                         g_free(data);
3621                         return NULL;
3622                 }
3623
3624                 partial_result =
3625                         (GSList *)imap_get_uncached_messages_thread(data);
3626                 *r = data->ok;
3627                 if (data->ok != MAILIMAP_NO_ERROR) {
3628                         goto bail;
3629                 }
3630                 statusbar_progress_all(data->cur,data->total, 1);
3631
3632                 g_slist_free(newlist);
3633
3634                 result = g_slist_concat(result, partial_result);
3635         }
3636 bail:
3637         g_free(data);
3638
3639         statusbar_progress_all(0,0,0);
3640         statusbar_pop_all();
3641
3642         return result;
3643 }
3644
3645 static void imap_delete_all_cached_messages(FolderItem *item)
3646 {
3647         gchar *dir;
3648
3649         g_return_if_fail(item != NULL);
3650         g_return_if_fail(item->folder != NULL);
3651         g_return_if_fail(FOLDER_CLASS(item->folder) == &imap_class);
3652
3653         debug_print("Deleting all cached messages...\n");
3654
3655         dir = folder_item_get_path(item);
3656         if (is_dir_exist(dir))
3657                 remove_all_numbered_files(dir);
3658         g_free(dir);
3659
3660         debug_print("done.\n");
3661 }
3662
3663 gchar imap_get_path_separator_for_item(FolderItem *item)
3664 {
3665         Folder *folder = NULL;
3666         IMAPFolder *imap_folder = NULL;
3667         IMAPSession *session = NULL;
3668         gchar result = '/';
3669         gint ok = MAILIMAP_NO_ERROR;
3670         if (!item)
3671                 return '/';
3672         folder = item->folder;
3673
3674         if (!folder)
3675                 return '/';
3676
3677         imap_folder = IMAP_FOLDER(folder);
3678
3679         debug_print("getting session...");
3680         session = imap_session_get(FOLDER(folder));
3681         result = imap_get_path_separator(session, imap_folder, item->path, &ok);
3682         return result;
3683 }
3684
3685 static gchar imap_refresh_path_separator(IMAPSession *session, IMAPFolder *folder, const gchar *subfolder, gint *ok)
3686 {
3687         clist * lep_list;
3688         int r;
3689         gchar separator = '\0';
3690
3691         g_return_val_if_fail(session != NULL, '/');
3692         r = imap_threaded_list((Folder *)folder, "", subfolder, &lep_list);
3693
3694         if (r != MAILIMAP_NO_ERROR) {
3695                 imap_handle_error(SESSION(session), NULL, r);
3696                 log_warning(LOG_PROTOCOL, _("LIST failed\n"));
3697                 *ok = r;
3698                 return '\0';
3699         }
3700
3701         if (lep_list != NULL && clist_count(lep_list) > 0) {
3702                 clistiter * iter = clist_begin(lep_list);
3703                 struct mailimap_mailbox_list * mb;
3704                 mb = clist_content(iter);
3705
3706                 separator = mb->mb_delimiter;
3707                 debug_print("got separator: %c\n", folder->last_seen_separator);
3708         }
3709         *ok = MAILIMAP_NO_ERROR;
3710         mailimap_list_result_free(lep_list);
3711         return separator;
3712 }
3713
3714 static gchar imap_get_path_separator(IMAPSession *session, IMAPFolder *folder, const gchar *path, gint *ok)
3715 {
3716         gchar separator = '/';
3717         *ok = MAILIMAP_NO_ERROR;
3718         if (folder->last_seen_separator == 0) {
3719                 folder->last_seen_separator = imap_refresh_path_separator(session, folder, "", ok);
3720         }
3721
3722         if (folder->last_seen_separator == 0) {
3723                 folder->last_seen_separator = imap_refresh_path_separator(session, folder, "INBOX", ok);
3724         }
3725
3726         if (folder->last_seen_separator != 0) {
3727                 debug_print("using separator: %c\n", folder->last_seen_separator);
3728                 return folder->last_seen_separator;
3729         }
3730
3731         return separator;
3732 }
3733
3734 static gchar *imap_get_real_path(IMAPSession *session, IMAPFolder *folder, const gchar *path, gint *ok)
3735 {
3736         gchar *real_path = NULL;
3737         gchar separator;
3738
3739         g_return_val_if_fail(folder != NULL, NULL);
3740         g_return_val_if_fail(path != NULL, NULL);
3741
3742         *ok = MAILIMAP_NO_ERROR;
3743
3744         real_path = imap_utf8_to_modified_utf7(path, FALSE);
3745         separator = imap_get_path_separator(session, folder, path, ok);
3746         if (*ok == MAILIMAP_NO_ERROR)
3747                 imap_path_separator_subst(real_path, separator);
3748
3749         return real_path;
3750 }
3751
3752 static gint imap_set_message_flags(IMAPSession *session,
3753                                    IMAPFolderItem *item,
3754                                    MsgNumberList *numlist,
3755                                    IMAPFlags flags,
3756                                    GSList *tags,
3757                                    gboolean is_set)
3758 {
3759         gint ok = 0;
3760         GSList *seq_list;
3761         GSList * cur;
3762         gint total = 0;
3763         IMAPFolder *folder = NULL;
3764         GSList *sorted_list = NULL;
3765
3766         if (numlist == NULL || session == NULL)
3767                 return MAILIMAP_ERROR_BAD_STATE;
3768
3769         folder = IMAP_FOLDER(session->folder);
3770
3771         sorted_list = g_slist_copy(numlist);
3772         sorted_list = g_slist_sort(sorted_list, g_int_compare);
3773
3774         cur = g_slist_last(sorted_list);
3775
3776         if (cur)
3777                 total = GPOINTER_TO_INT(cur->data);
3778
3779         seq_list = imap_get_lep_set_from_numlist(IMAP_FOLDER(session->folder), sorted_list);
3780
3781         statusbar_print_all(_("Flagging messages..."));
3782
3783         for(cur = seq_list ; cur != NULL ; cur = g_slist_next(cur)) {
3784                 struct mailimap_set * imapset = (struct mailimap_set *)cur->data;
3785                 struct mailimap_set_item *set_item = NULL;
3786
3787                 if (imapset->set_list)
3788                         set_item = clist_content(clist_begin(imapset->set_list));
3789                 else
3790                         continue;
3791
3792                 if (set_item == NULL)
3793                         continue;
3794
3795                 statusbar_progress_all(set_item->set_first, total, 1);
3796
3797                 ok = imap_cmd_store(session, item, imapset,
3798                                     flags, tags, is_set);
3799                 statusbar_progress_all(set_item->set_last, total, 1);
3800                 if (ok != MAILIMAP_NO_ERROR && folder->max_set_size > 20) {
3801                         /* reduce max set size */
3802                         folder->max_set_size /= 2;
3803                 }
3804                 if (ok != MAILIMAP_NO_ERROR && is_fatal(ok)) {
3805                         break;
3806                 }
3807         }
3808
3809         g_slist_free(sorted_list);
3810
3811         statusbar_progress_all(0,0,0);
3812         statusbar_pop_all();
3813
3814         imap_lep_set_free(seq_list);
3815
3816         return ok;
3817 }
3818
3819 typedef struct _select_data {
3820         IMAPSession *session;
3821         gchar *real_path;
3822         gint *exists;
3823         gint *recent;
3824         gint *unseen;
3825         guint32 *uid_validity;
3826         gboolean done;
3827 } select_data;
3828
3829 static gint imap_select(IMAPSession *session, IMAPFolder *folder,
3830                         FolderItem *item,
3831                         gint *exists, gint *recent, gint *unseen,
3832                         guint32 *uid_validity, gint *can_create_flags,
3833                         gboolean block)
3834 {
3835         gchar *real_path;
3836         gint ok = MAILIMAP_NO_ERROR;
3837         gint exists_, recent_, unseen_;
3838         guint32 uid_validity_;
3839         gint can_create_flags_;
3840         const gchar *path = item ? item->path:NULL;
3841
3842         if (!item) {
3843                 return MAILIMAP_ERROR_BAD_STATE;
3844         }
3845
3846         if (!exists && !recent && !unseen && !uid_validity && !can_create_flags) {
3847                 if (session->mbox && strcmp(session->mbox, path) == 0)
3848                         return MAILIMAP_NO_ERROR;
3849         }
3850         if (!exists && !recent && !unseen && !uid_validity && can_create_flags) {
3851                 if (session->mbox && strcmp(session->mbox, path) == 0) {
3852                         if (IMAP_FOLDER_ITEM(item)->can_create_flags != ITEM_CAN_CREATE_FLAGS_UNKNOWN)
3853                                 return MAILIMAP_NO_ERROR;
3854                 }
3855         }
3856         if (!exists)
3857                 exists = &exists_;
3858         if (!recent)
3859                 recent = &recent_;
3860         if (!unseen)
3861                 unseen = &unseen_;
3862         if (!uid_validity)
3863                 uid_validity = &uid_validity_;
3864         if (!can_create_flags)
3865                 can_create_flags = &can_create_flags_;
3866
3867         g_free(session->mbox);
3868         session->mbox = NULL;
3869         session->exists = 0;
3870         session->recent = 0;
3871         session->expunge = 0;
3872
3873         real_path = imap_get_real_path(session, folder, path, &ok);
3874         if (is_fatal(ok)) {
3875                 g_free(real_path);
3876                 return ok;
3877         }
3878         g_slist_free(IMAP_FOLDER_ITEM(item)->ok_flags);
3879         IMAP_FOLDER_ITEM(item)->ok_flags = NULL;
3880         ok = imap_cmd_select(session, real_path,
3881                              exists, recent, unseen, uid_validity, can_create_flags,
3882                              &(IMAP_FOLDER_ITEM(item)->ok_flags), block);
3883         if (ok != MAILIMAP_NO_ERROR) {
3884                 log_warning(LOG_PROTOCOL, _("can't select folder: %s\n"), real_path);
3885         } else {
3886                 session->mbox = g_strdup(path);
3887                 session->folder_content_changed = FALSE;
3888                 session->exists = *exists;
3889                 session->recent = *recent;
3890                 session->expunge = 0;
3891                 session->unseen = *unseen;
3892                 session->uid_validity = *uid_validity;
3893                 debug_print("select: exists %d recent %d expunge %d uid_validity %d can_create_flags %d\n",
3894                         session->exists, session->recent, session->expunge,
3895                         session->uid_validity, *can_create_flags);
3896         }
3897         if (*can_create_flags) {
3898                 IMAP_FOLDER_ITEM(item)->can_create_flags = ITEM_CAN_CREATE_FLAGS;
3899         } else {
3900                 IMAP_FOLDER_ITEM(item)->can_create_flags = ITEM_CANNOT_CREATE_FLAGS;
3901         }
3902         g_free(real_path);
3903
3904         return ok;
3905 }
3906
3907 static gint imap_status(IMAPSession *session, IMAPFolder *folder,
3908                         const gchar *path, IMAPFolderItem *item,
3909                         gint *messages,
3910                         guint32 *uid_next, guint32 *uid_validity,
3911                         gint *unseen, gboolean block)
3912 {
3913         int r = MAILIMAP_NO_ERROR;
3914         clistiter * iter;
3915         struct mailimap_mailbox_data_status * data_status;
3916         int got_values;
3917         gchar *real_path;
3918         guint mask = 0;
3919
3920         real_path = imap_get_real_path(session, folder, path, &r);
3921         if (is_fatal(r)) {
3922                 g_free(real_path);
3923                 return r;
3924         }
3925         if (messages) {
3926                 mask |= 1 << 0;
3927                 *messages = 0;
3928         }
3929         if (uid_next) {
3930                 mask |= 1 << 2;
3931                 *uid_next = 0;
3932         }
3933         if (uid_validity) {
3934                 mask |= 1 << 3;
3935                 *uid_validity = 0;
3936         }
3937         if (unseen) {
3938                 mask |= 1 << 4;
3939                 *unseen = 0;
3940         }
3941
3942         if (session->mbox != NULL &&
3943             !strcmp(session->mbox, item->item.path)) {
3944                 r = imap_cmd_close(session);
3945                 if (r != MAILIMAP_NO_ERROR) {
3946                         debug_print("close err %d\n", r);
3947                         g_free(real_path);
3948                         return r;
3949                 }
3950         }
3951
3952         r = imap_threaded_status(FOLDER(folder), real_path,
3953                 &data_status, mask);
3954
3955         g_free(real_path);
3956         if (r != MAILIMAP_NO_ERROR) {
3957                 imap_handle_error(SESSION(session), NULL, r);
3958                 debug_print("status err %d\n", r);
3959                 return r;
3960         }
3961
3962         if (data_status == NULL || data_status->st_info_list == NULL) {
3963                 debug_print("data_status %p\n", data_status);
3964                 if (data_status) {
3965                         debug_print("data_status->st_info_list %p\n", data_status->st_info_list);
3966                         mailimap_mailbox_data_status_free(data_status);
3967                 }
3968                 return MAILIMAP_ERROR_BAD_STATE;
3969         }
3970
3971         got_values = 0;
3972         if (data_status->st_info_list) {
3973                 for(iter = clist_begin(data_status->st_info_list) ; iter != NULL ;
3974                     iter = clist_next(iter)) {
3975                         struct mailimap_status_info * info;
3976
3977                         info = clist_content(iter);
3978                         switch (info->st_att) {
3979                         case MAILIMAP_STATUS_ATT_MESSAGES:
3980                                 if (messages) {
3981                                         * messages = info->st_value;
3982                                         got_values |= 1 << 0;
3983                                 }
3984                                 break;
3985
3986                         case MAILIMAP_STATUS_ATT_UIDNEXT:
3987                                 if (uid_next) {
3988                                         * uid_next = info->st_value;
3989                                         got_values |= 1 << 2;
3990                                 }
3991                                 break;
3992
3993                         case MAILIMAP_STATUS_ATT_UIDVALIDITY:
3994                                 if (uid_validity) {
3995                                         * uid_validity = info->st_value;
3996                                         got_values |= 1 << 3;
3997                                 }
3998                                 break;
3999
4000                         case MAILIMAP_STATUS_ATT_UNSEEN:
4001                                 if (unseen) {
4002                                         * unseen = info->st_value;
4003                                         got_values |= 1 << 4;
4004                                 }
4005                                 break;
4006                         }
4007                 }
4008         }
4009         mailimap_mailbox_data_status_free(data_status);
4010
4011         if (got_values != mask) {
4012                 g_warning("status: incomplete values received (%d)\n", got_values);
4013         }
4014         return MAILIMAP_NO_ERROR;
4015 }
4016
4017 static void imap_free_capabilities(IMAPSession *session)
4018 {
4019         slist_free_strings_full(session->capability);
4020         session->capability = NULL;
4021 }
4022
4023 /* low-level IMAP4rev1 commands */
4024
4025 static gint imap_cmd_login(IMAPSession *session,
4026                            const gchar *user, const gchar *pass,
4027                            const gchar *type)
4028 {
4029         int r;
4030         gint ok;
4031
4032         if (!strcmp(type, "LOGIN") && imap_has_capability(session, "LOGINDISABLED")) {
4033                 gint ok = MAILIMAP_ERROR_BAD_STATE;
4034                 if (imap_has_capability(session, "STARTTLS")) {
4035 #ifdef USE_GNUTLS
4036                         log_warning(LOG_PROTOCOL, _("Server requires TLS to log in.\n"));
4037                         ok = imap_cmd_starttls(session);
4038                         if (ok != MAILIMAP_NO_ERROR) {
4039                                 log_warning(LOG_PROTOCOL, _("Can't start TLS session.\n"));
4040                                 return ok;
4041                         } else {
4042                                 /* refresh capas */
4043                                 imap_free_capabilities(session);
4044                                 if ((r = imap_get_capabilities(session)) != MAILIMAP_NO_ERROR) {
4045                                         imap_handle_error(SESSION(session), NULL, r);
4046                                         log_warning(LOG_PROTOCOL, _("Can't refresh capabilities.\n"));
4047                                         return r;
4048                                 }
4049                         }
4050 #else
4051                         log_error(LOG_PROTOCOL, _("Connection to %s failed: "
4052                                         "server requires TLS, but Claws Mail "
4053                                         "has been compiled without OpenSSL "
4054                                         "support.\n"),
4055                                         SESSION(session)->server);
4056                         return MAILIMAP_ERROR_LOGIN;
4057 #endif
4058                 } else {
4059                         log_error(LOG_PROTOCOL, _("Server logins are disabled.\n"));
4060                         return MAILIMAP_ERROR_LOGIN;
4061                 }
4062         }
4063
4064         log_print(LOG_PROTOCOL, "IMAP4> Logging %s to %s using %s\n",
4065                         user,
4066                         SESSION(session)->server,
4067                         type);
4068         r = imap_threaded_login(session->folder, user, pass, type);
4069         if (r != MAILIMAP_NO_ERROR) {
4070                 imap_handle_error(SESSION(session), NULL, r);
4071                 log_print(LOG_PROTOCOL, "IMAP4< Error logging in to %s\n",
4072                                 SESSION(session)->server);
4073                 ok = r;
4074         } else {
4075                 log_print(LOG_PROTOCOL, "IMAP4< Login to %s successful\n",
4076                                 SESSION(session)->server);
4077                 ok = MAILIMAP_NO_ERROR;
4078         }
4079         return ok;
4080 }
4081
4082 static gint imap_cmd_noop(IMAPSession *session)
4083 {
4084         int r;
4085         unsigned int exists, recent, expunge, unseen, uidnext, uidval;
4086
4087         r = imap_threaded_noop(session->folder, &exists, &recent, &expunge, &unseen, &uidnext, &uidval);
4088         if (r != MAILIMAP_NO_ERROR) {
4089                 imap_handle_error(SESSION(session), NULL, r);
4090                 debug_print("noop err %d\n", r);
4091                 return r;
4092         }
4093
4094         if ((exists && exists != session->exists)
4095          || (recent && recent != session->recent)
4096          || (expunge && expunge != session->expunge)
4097          || (unseen && unseen != session->unseen)) {
4098                 session->folder_content_changed = TRUE;
4099         }
4100         if (uidnext != 0 && uidnext != session->uid_next) {
4101                 session->uid_next = uidnext;
4102                 session->folder_content_changed = TRUE;
4103         }
4104         if (uidval != 0 && uidval != session->uid_validity) {
4105                 session->uid_validity = uidval;
4106                 session->folder_content_changed = TRUE;
4107         }
4108
4109         session->exists = exists;
4110         session->recent = recent;
4111         session->expunge = expunge;
4112         session->unseen = unseen;
4113
4114         session_set_access_time(SESSION(session));
4115
4116         return MAILIMAP_NO_ERROR;
4117 }
4118
4119 #ifdef USE_GNUTLS
4120 static gint imap_cmd_starttls(IMAPSession *session)
4121 {
4122         int r;
4123
4124         r = imap_threaded_starttls(session->folder,
4125                 SESSION(session)->server, SESSION(session)->port);
4126         if (r != MAILIMAP_NO_ERROR) {
4127                 imap_handle_error(SESSION(session), NULL, r);
4128                 debug_print("starttls err %d\n", r);
4129                 return r;
4130         }
4131         return MAILIMAP_NO_ERROR;
4132 }
4133 #endif
4134
4135 static gint imap_cmd_select(IMAPSession *session, const gchar *folder,
4136                             gint *exists, gint *recent, gint *unseen,
4137                             guint32 *uid_validity, gint *can_create_flags,
4138                             GSList **ok_flags, gboolean block)
4139 {
4140         int r;
4141
4142         r = imap_threaded_select(session->folder, folder,
4143                                  exists, recent, unseen, uid_validity, can_create_flags, ok_flags);
4144         if (r != MAILIMAP_NO_ERROR) {
4145                 imap_handle_error(SESSION(session), NULL, r);
4146                 debug_print("select err %d\n", r);
4147                 return r;
4148         }
4149         return MAILIMAP_NO_ERROR;
4150 }
4151
4152 static gint imap_cmd_close(IMAPSession *session)
4153 {
4154         int r;
4155
4156         r = imap_threaded_close(session->folder);
4157         if (r != MAILIMAP_NO_ERROR) {
4158                 imap_handle_error(SESSION(session), NULL, r);
4159                 debug_print("close err %d\n", r);
4160                 return r;
4161         }
4162         g_free(session->mbox);
4163         session->mbox = NULL;
4164         session->exists = 0;
4165         session->recent = 0;
4166         session->expunge = 0;
4167         return MAILIMAP_NO_ERROR;
4168 }
4169
4170 static gint imap_cmd_examine(IMAPSession *session, const gchar *folder,
4171                              gint *exists, gint *recent, gint *unseen,
4172                              guint32 *uid_validity, gboolean block)
4173 {
4174         int r;
4175
4176         r = imap_threaded_examine(session->folder, folder,
4177                                   exists, recent, unseen, uid_validity);
4178         if (r != MAILIMAP_NO_ERROR) {
4179                 imap_handle_error(SESSION(session), NULL, r);
4180                 debug_print("examine err %d\n", r);
4181
4182                 return r;
4183         }
4184         return MAILIMAP_NO_ERROR;
4185 }
4186
4187 static gint imap_cmd_create(IMAPSession *session, const gchar *folder)
4188 {
4189         int r;
4190
4191         r = imap_threaded_create(session->folder, folder);
4192         if (r != MAILIMAP_NO_ERROR) {
4193                 imap_handle_error(SESSION(session), NULL, r);
4194                 return r;
4195         }
4196
4197         return MAILIMAP_NO_ERROR;
4198 }
4199
4200 static gint imap_cmd_rename(IMAPSession *session, const gchar *old_folder,
4201                             const gchar *new_folder)
4202 {
4203         int r;
4204
4205         r = imap_threaded_rename(session->folder, old_folder,
4206                                  new_folder);
4207         if (r != MAILIMAP_NO_ERROR) {
4208                 imap_handle_error(SESSION(session), NULL, r);
4209                 return r;
4210         }
4211
4212         return MAILIMAP_NO_ERROR;
4213 }
4214
4215 static gint imap_cmd_delete(IMAPSession *session, const gchar *folder)
4216 {
4217         int r;
4218
4219
4220         r = imap_threaded_delete(session->folder, folder);
4221         if (r != MAILIMAP_NO_ERROR) {
4222                 imap_handle_error(SESSION(session), NULL, r);
4223                 return r;
4224         }
4225
4226         return MAILIMAP_NO_ERROR;
4227 }
4228
4229 typedef struct _fetch_data {
4230         IMAPSession *session;
4231         guint32 uid;
4232         const gchar *filename;
4233         gboolean headers;
4234         gboolean body;
4235         gboolean done;
4236 } fetch_data;
4237
4238 static void *imap_cmd_fetch_thread(void *data)
4239 {
4240         fetch_data *stuff = (fetch_data *)data;
4241         IMAPSession *session = stuff->session;
4242         guint32 uid = stuff->uid;
4243         const gchar *filename = stuff->filename;
4244         int r;
4245
4246         if (stuff->body) {
4247                 r = imap_threaded_fetch_content(session->folder,
4248                                                uid, 1, filename);
4249         }
4250         else {
4251                 r = imap_threaded_fetch_content(session->folder,
4252                                                 uid, 0, filename);
4253         }
4254         if (r != MAILIMAP_NO_ERROR) {
4255                 imap_handle_error(SESSION(session), NULL, r);
4256                 debug_print("fetch err %d\n", r);
4257                 return GINT_TO_POINTER(r);
4258         }
4259         return GINT_TO_POINTER(MAILIMAP_NO_ERROR);
4260 }
4261
4262 static gint imap_cmd_fetch(IMAPSession *session, guint32 uid,
4263                                 const gchar *filename, gboolean headers,
4264                                 gboolean body)
4265 {
4266         fetch_data *data = g_new0(fetch_data, 1);
4267         int result = 0;
4268         data->done = FALSE;
4269         data->session = session;
4270         data->uid = uid;
4271         data->filename = filename;
4272         data->headers = headers;
4273         data->body = body;
4274
4275         if (prefs_common.work_offline &&
4276             !inc_offline_should_override(FALSE,
4277                 _("Claws Mail needs network access in order "
4278                   "to access the IMAP server."))) {
4279                 g_free(data);
4280                 return -1;
4281         }
4282         statusbar_print_all(_("Fetching message..."));
4283         result = GPOINTER_TO_INT(imap_cmd_fetch_thread(data));
4284         statusbar_pop_all();
4285         g_free(data);
4286         return result;
4287 }
4288
4289
4290 static gint imap_cmd_append(IMAPSession *session,
4291                             IMAPFolderItem *item,
4292                             const gchar *destfolder,
4293                             const gchar *file, IMAPFlags flags,
4294                             guint32 *new_uid)
4295 {
4296         struct mailimap_flag_list * flag_list;
4297         int r;
4298
4299         cm_return_val_if_fail(file != NULL, MAILIMAP_ERROR_BAD_STATE);
4300
4301         flag_list = imap_flag_to_lep(item, flags, NULL);
4302         lock_session(session);
4303         r = imap_threaded_append(session->folder, destfolder,
4304                          file, flag_list, (int *)new_uid);
4305         mailimap_flag_list_free(flag_list);
4306
4307         if (r != MAILIMAP_NO_ERROR) {
4308                 imap_handle_error(SESSION(session), NULL, r);
4309                 debug_print("append err %d\n", r);
4310                 return r;
4311         }
4312
4313         unlock_session(session);
4314
4315         return MAILIMAP_NO_ERROR;
4316 }
4317
4318 static gint imap_cmd_copy(IMAPSession *session, struct mailimap_set * set,
4319                           const gchar *destfolder,
4320                           struct mailimap_set **source, struct mailimap_set **dest)
4321 {
4322         int r;
4323
4324         g_return_val_if_fail(session != NULL, MAILIMAP_ERROR_BAD_STATE);
4325         g_return_val_if_fail(set != NULL, MAILIMAP_ERROR_BAD_STATE);
4326         g_return_val_if_fail(destfolder != NULL, MAILIMAP_ERROR_BAD_STATE);
4327
4328         r = imap_threaded_copy(session->folder, set, destfolder, source, dest);
4329         if (r != MAILIMAP_NO_ERROR) {
4330                 imap_handle_error(SESSION(session), NULL, r);
4331                 return r;
4332         }
4333
4334         return MAILIMAP_NO_ERROR;
4335 }
4336
4337 static gint imap_cmd_store(IMAPSession *session,
4338                            IMAPFolderItem *item,
4339                            struct mailimap_set * set,
4340                            IMAPFlags flags, GSList *tags, int do_add)
4341 {
4342         int r;
4343         struct mailimap_flag_list * flag_list = NULL;
4344         struct mailimap_store_att_flags * store_att_flags;
4345
4346         flag_list = imap_flag_to_lep(item, flags, tags);
4347
4348         if (do_add)
4349                 store_att_flags =
4350                         mailimap_store_att_flags_new_add_flags_silent(flag_list);
4351         else
4352                 store_att_flags =
4353                         mailimap_store_att_flags_new_remove_flags_silent(flag_list);
4354
4355         r = imap_threaded_store(session->folder, set, store_att_flags);
4356         mailimap_store_att_flags_free(store_att_flags);
4357         if (r != MAILIMAP_NO_ERROR) {
4358                 imap_handle_error(SESSION(session), NULL, r);
4359                 return r;
4360         }
4361
4362         return MAILIMAP_NO_ERROR;
4363 }
4364
4365 static gint imap_cmd_expunge(IMAPSession *session, gboolean do_expunge)
4366 {
4367         int r;
4368
4369         if (!do_expunge)
4370                 return MAILIMAP_NO_ERROR;
4371
4372         if (prefs_common.work_offline &&
4373             !inc_offline_should_override(FALSE,
4374                 _("Claws Mail needs network access in order "
4375                   "to access the IMAP server."))) {
4376                 return -1;
4377         }
4378
4379         r = imap_threaded_expunge(session->folder);
4380         if (r != MAILIMAP_NO_ERROR) {
4381                 imap_handle_error(SESSION(session), NULL, r);
4382                 return r;
4383         }
4384
4385         return MAILIMAP_NO_ERROR;
4386 }
4387
4388 gint imap_expunge(Folder *folder, FolderItem *item)
4389 {
4390         IMAPSession *session = imap_session_get(folder);
4391         if (session == NULL)
4392                 return -1;
4393
4394         return imap_cmd_expunge(session, TRUE);
4395 }
4396
4397 static void imap_path_separator_subst(gchar *str, gchar separator)
4398 {
4399         gchar *p;
4400         gboolean in_escape = FALSE;
4401
4402         if (!separator || separator == '/') return;
4403
4404         for (p = str; *p != '\0'; p++) {
4405                 if (*p == '/' && !in_escape)
4406                         *p = separator;
4407                 else if (*p == '&' && *(p + 1) != '-' && !in_escape)
4408                         in_escape = TRUE;
4409                 else if (*p == '-' && in_escape)
4410                         in_escape = FALSE;
4411         }
4412 }
4413
4414 static gboolean imap_rename_folder_func(GNode *node, gpointer data)
4415 {
4416         FolderItem *item = node->data;
4417         gchar **paths = data;
4418         const gchar *oldpath = paths[0];
4419         const gchar *newpath = paths[1];
4420         gchar *real_oldpath, *real_newpath;
4421         gchar *base;
4422         gchar *new_itempath;
4423         gint oldpathlen;
4424         IMAPSession *session = imap_session_get(item->folder);
4425         gint ok = MAILIMAP_NO_ERROR;
4426         oldpathlen = strlen(oldpath);
4427         if (strncmp(oldpath, item->path, oldpathlen) != 0) {
4428                 g_warning("path doesn't match: %s, %s\n", oldpath, item->path);
4429                 return TRUE;
4430         }
4431
4432         base = item->path + oldpathlen;
4433         while (*base == G_DIR_SEPARATOR) base++;
4434         if (*base == '\0')
4435                 new_itempath = g_strdup(newpath);
4436         else
4437                 new_itempath = g_strconcat(newpath, G_DIR_SEPARATOR_S, base,
4438                                            NULL);
4439
4440         real_oldpath = imap_get_real_path(session, IMAP_FOLDER(item->folder), item->path, &ok);
4441         g_free(item->path);
4442         item->path = new_itempath;
4443
4444         real_newpath = imap_get_real_path(session, IMAP_FOLDER(item->folder), item->path, &ok);
4445
4446         imap_threaded_subscribe(item->folder, real_oldpath, FALSE);
4447         imap_threaded_subscribe(item->folder, real_newpath, TRUE);
4448
4449         g_free(real_oldpath);
4450         g_free(real_newpath);
4451         return FALSE;
4452 }
4453
4454 static gint get_list_of_uids(IMAPSession *session, Folder *folder, IMAPFolderItem *item, GSList **msgnum_list)
4455 {
4456         GSList *uidlist, *elem;
4457         int r = -1;
4458         clist * lep_uidlist;
4459         gint ok, nummsgs = 0;
4460
4461         if (session == NULL) {
4462                 return -1;
4463         }
4464
4465         ok = imap_select(session, IMAP_FOLDER(folder), FOLDER_ITEM(item),
4466                          NULL, NULL, NULL, NULL, NULL, TRUE);
4467         if (ok != MAILIMAP_NO_ERROR) {
4468                 return -1;
4469         }
4470
4471         g_slist_free(item->uid_list);
4472         item->uid_list = NULL;
4473
4474         uidlist = NULL;
4475
4476         if (folder->account && folder->account->low_bandwidth) {
4477                 r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_SIMPLE,
4478                                 NULL, NULL, NULL, &lep_uidlist);
4479         }
4480
4481         if (r == MAILIMAP_NO_ERROR) {
4482                 uidlist = imap_uid_list_from_lep(lep_uidlist, NULL);
4483                 mailimap_search_result_free(lep_uidlist);
4484         } else {
4485                 carray * lep_uidtab;
4486                 if (r != -1) { /* inited */
4487                         imap_handle_error(SESSION(session), NULL, r);
4488                         if (is_fatal(r))
4489                                 return -1;
4490                 }
4491                 r = imap_threaded_fetch_uid(folder, 1,
4492                                     &lep_uidtab);
4493                 if (r == MAILIMAP_NO_ERROR) {
4494                         uidlist = imap_uid_list_from_lep_tab(lep_uidtab);
4495                         imap_fetch_uid_list_free(lep_uidtab);
4496                 }
4497         }
4498
4499         if (r != MAILIMAP_NO_ERROR) {
4500                 imap_handle_error(SESSION(session), NULL, r);
4501                 return -1;
4502         }
4503
4504         for (elem = uidlist; elem != NULL; elem = g_slist_next(elem)) {
4505                 guint msgnum;
4506
4507                 msgnum = GPOINTER_TO_INT(elem->data);
4508
4509                 *msgnum_list = g_slist_prepend(*msgnum_list, GINT_TO_POINTER(msgnum));
4510                 item->uid_list = g_slist_prepend(item->uid_list, GINT_TO_POINTER(msgnum));
4511                 nummsgs++;
4512         }
4513         g_slist_free(uidlist);
4514
4515         unlock_session(session); /* locked from imap_get_num_list */
4516
4517         return nummsgs;
4518
4519 }
4520
4521 gint imap_get_num_list(Folder *folder, FolderItem *_item, GSList **msgnum_list, gboolean *old_uids_valid)
4522 {
4523         IMAPFolderItem *item = (IMAPFolderItem *)_item;
4524         IMAPSession *session;
4525         gint nummsgs;
4526         GSList *uidlist = NULL;
4527         gchar *dir;
4528         gint known_list_len = 0;
4529         gchar *path;
4530
4531         debug_print("get_num_list\n");
4532
4533         g_return_val_if_fail(folder != NULL, -1);
4534         g_return_val_if_fail(item != NULL, -1);
4535         g_return_val_if_fail(item->item.path != NULL, -1);
4536         g_return_val_if_fail(FOLDER_CLASS(folder) == &imap_class, -1);
4537         g_return_val_if_fail(folder->account != NULL, -1);
4538
4539         known_list_len = g_slist_length(item->uid_list);
4540         if (!item->should_update) {
4541                 debug_print("get_num_list: nothing to update\n");
4542                 *old_uids_valid = TRUE;
4543                 if (known_list_len == item->item.total_msgs
4544                  && known_list_len > 0) {
4545                         *msgnum_list = g_slist_copy(item->uid_list);
4546                         return known_list_len;
4547                 } else {
4548                         debug_print("don't know the list length...\n");
4549                 }
4550         }
4551
4552         if (prefs_common.work_offline &&
4553             !inc_offline_should_override(FALSE,
4554                 _("Claws Mail needs network access in order "
4555                   "to access the IMAP server."))) {
4556                 return -1;
4557         }
4558
4559         path = folder_item_get_path(_item);
4560         if (!is_dir_exist(path)) {
4561                 if(is_file_exist(path))
4562                         claws_unlink(path);
4563                 make_dir_hier(path);
4564         }
4565         g_free(path);
4566
4567         debug_print("getting session...\n");
4568         session = imap_session_get(folder);
4569         g_return_val_if_fail(session != NULL, -1);
4570
4571         lock_session(session); /* unlocked by get_list_of_uids */
4572         if (FOLDER_ITEM(item)->path)
4573                 statusbar_print_all(_("Scanning folder %s%c%s..."),
4574                                       FOLDER_ITEM(item)->folder->name,
4575                                       G_DIR_SEPARATOR,
4576                                       FOLDER_ITEM(item)->path);
4577         else
4578                 statusbar_print_all(_("Scanning folder %s..."),
4579                                       FOLDER_ITEM(item)->folder->name);
4580
4581         if (item->should_trash_cache) {
4582                 *old_uids_valid = FALSE;
4583                 debug_print("get_num_list: trashing num list\n");
4584                 debug_print("Freeing imap uid cache\n");
4585                 item->lastuid = 0;
4586                 g_slist_free(item->uid_list);
4587                 item->uid_list = NULL;
4588
4589                 imap_delete_all_cached_messages((FolderItem *)item);
4590         } else {
4591                 debug_print("get_num_list: updating num list\n");
4592                 *old_uids_valid = TRUE;
4593         }
4594
4595         nummsgs = get_list_of_uids(session, folder, item, &uidlist);
4596         /* session could be broken now, in case of fatal error */
4597
4598         debug_print("get_num_list: got %d msgs\n", nummsgs);
4599
4600         if (nummsgs < 0) {
4601                 statusbar_pop_all();
4602                 return -1;
4603         }
4604
4605         *msgnum_list = uidlist;
4606
4607         dir = folder_item_get_path((FolderItem *)item);
4608         debug_print("removing old messages from %s\n", dir);
4609         remove_numbered_files_not_in_list(dir, *msgnum_list);
4610         g_free(dir);
4611
4612         debug_print("get_num_list - ok - %i\n", nummsgs);
4613         statusbar_pop_all();
4614         item->should_trash_cache = FALSE;
4615         item->should_update = FALSE;
4616         return nummsgs;
4617 }
4618
4619 static MsgInfo *imap_parse_msg(const gchar *file, FolderItem *item)
4620 {
4621         MsgInfo *msginfo;
4622         MsgFlags flags;
4623
4624         flags.perm_flags = MSG_NEW|MSG_UNREAD;
4625         flags.tmp_flags = 0;
4626
4627         g_return_val_if_fail(item != NULL, NULL);
4628         g_return_val_if_fail(file != NULL, NULL);
4629
4630         if (folder_has_parent_of_type(item, F_QUEUE)) {
4631                 MSG_SET_TMP_FLAGS(flags, MSG_QUEUED);
4632         } else if (folder_has_parent_of_type(item, F_DRAFT)) {
4633                 MSG_SET_TMP_FLAGS(flags, MSG_DRAFT);
4634         }
4635
4636         msginfo = procheader_parse_file(file, flags, FALSE, FALSE);
4637         if (!msginfo) return NULL;
4638
4639         msginfo->plaintext_file = g_strdup(file);
4640         msginfo->folder = item;
4641
4642         return msginfo;
4643 }
4644
4645 GSList *imap_get_msginfos(Folder *folder, FolderItem *item,
4646                           GSList *msgnum_list)
4647 {
4648         IMAPSession *session;
4649         MsgInfoList *ret = NULL;
4650         gint ok;
4651
4652         debug_print("get_msginfos\n");
4653
4654         g_return_val_if_fail(folder != NULL, NULL);
4655         g_return_val_if_fail(item != NULL, NULL);
4656         g_return_val_if_fail(msgnum_list != NULL, NULL);
4657
4658         debug_print("getting session...\n");
4659         session = imap_session_get(folder);
4660         g_return_val_if_fail(session != NULL, NULL);
4661
4662         lock_session(session); /* unlocked later in the function */
4663
4664         debug_print("IMAP getting msginfos\n");
4665         ok = imap_select(session, IMAP_FOLDER(folder), item,
4666                          NULL, NULL, NULL, NULL, NULL, FALSE);
4667         if (ok != MAILIMAP_NO_ERROR) {
4668                 return NULL;
4669         }
4670         if (!(folder_has_parent_of_type(item, F_DRAFT) ||
4671               folder_has_parent_of_type(item, F_QUEUE))) {
4672                 ret = g_slist_concat(ret,
4673                         imap_get_uncached_messages(session, item,
4674                                                    msgnum_list, &ok));
4675                 if (ok != MAILIMAP_NO_ERROR)
4676                         return NULL;
4677                 unlock_session(session);
4678         } else {
4679                 MsgNumberList *sorted_list, *elem, *llast = NULL;
4680                 gint startnum, lastnum;
4681
4682                 unlock_session(session);
4683
4684                 sorted_list = g_slist_sort(g_slist_copy(msgnum_list), g_int_compare);
4685
4686                 startnum = lastnum = GPOINTER_TO_INT(sorted_list->data);
4687
4688                 llast = g_slist_last(ret);
4689                 for (elem = sorted_list;; elem = g_slist_next(elem)) {
4690                         guint num = 0;
4691
4692                         if (elem)
4693                                 num = GPOINTER_TO_INT(elem->data);
4694
4695                         if (num > lastnum + 1 || elem == NULL) {
4696                                 int i;
4697                                 for (i = startnum; i <= lastnum; ++i) {
4698                                         gchar *file;
4699                                         file = imap_fetch_msg(folder, item, i);
4700                                         if (file != NULL) {
4701                                                 MsgInfo *msginfo = imap_parse_msg(file, item);
4702                                                 if (msginfo != NULL) {
4703                                                         msginfo->msgnum = i;
4704                                                         if (llast == NULL)
4705                                                                 llast = ret = g_slist_append(ret, msginfo);
4706                                                         else {
4707                                                                 llast = g_slist_append(llast, msginfo);
4708                                                                 llast = llast->next;
4709                                                         }
4710                                                 }
4711                                                 g_free(file);
4712                                         }
4713                                 }
4714
4715                                 if (elem == NULL)
4716                                         break;
4717
4718                                 startnum = num;
4719                         }
4720                         lastnum = num;
4721                 }
4722
4723                 g_slist_free(sorted_list);
4724         }
4725         return ret;
4726 }
4727
4728 MsgInfo *imap_get_msginfo(Folder *folder, FolderItem *item, gint uid)
4729 {
4730         MsgInfo *msginfo = NULL;
4731         MsgInfoList *msginfolist;
4732         MsgNumberList numlist;
4733
4734         numlist.next = NULL;
4735         numlist.data = GINT_TO_POINTER(uid);
4736
4737         msginfolist = imap_get_msginfos(folder, item, &numlist);
4738         if (msginfolist != NULL) {
4739                 msginfo = msginfolist->data;
4740                 g_slist_free(msginfolist);
4741         }
4742
4743         return msginfo;
4744 }
4745
4746 gboolean imap_scan_required(Folder *folder, FolderItem *_item)
4747 {
4748         IMAPSession *session;
4749         IMAPFolderItem *item = (IMAPFolderItem *)_item;
4750         gint ok, exists = 0, unseen = 0;
4751         guint32 uid_next = 0, uid_val = 0;
4752         gboolean selected_folder;
4753
4754         g_return_val_if_fail(folder != NULL, FALSE);
4755         g_return_val_if_fail(item != NULL, FALSE);
4756         g_return_val_if_fail(item->item.folder != NULL, FALSE);
4757         g_return_val_if_fail(FOLDER_CLASS(item->item.folder) == &imap_class, FALSE);
4758
4759         if (item->item.path == NULL)
4760                 return FALSE;
4761
4762         if (item->should_update) {
4763                 debug_print("scan already required\n");
4764                 return TRUE;
4765         }
4766         debug_print("getting session...\n");
4767         session = imap_session_get(folder);
4768
4769         g_return_val_if_fail(session != NULL, FALSE);
4770         lock_session(session); /* unlocked later in the function */
4771
4772         selected_folder = (session->mbox != NULL) &&
4773                           (!strcmp(session->mbox, item->item.path));
4774         if (selected_folder) {
4775                 if (!session->folder_content_changed) {
4776                         ok = imap_cmd_noop(session);
4777                         if (ok != MAILIMAP_NO_ERROR) {
4778                                 debug_print("disconnected!\n");
4779                                 if (!is_fatal(ok))
4780                                         session = imap_reconnect_if_possible(folder, session);
4781                                 else
4782                                         session = imap_session_get(folder);
4783                                 if (session == NULL)
4784                                         return FALSE;
4785                         }
4786
4787                         if (session->folder_content_changed) {
4788                                 debug_print("CHANGED (self-noop)! scan_required\n");
4789                                 item->should_update = TRUE;
4790                                 if (session->uid_validity && session->uid_validity != item->item.mtime) {
4791                                         item->item.mtime = session->uid_validity;
4792                                         item->should_trash_cache = TRUE;
4793                                 }
4794                                 unlock_session(session);
4795                                 return TRUE;
4796                         }
4797                 } else {
4798                         debug_print("CHANGED (previous noop)! scan_required\n");
4799                         item->should_update = TRUE;
4800                         if (session->uid_validity && session->uid_validity != item->item.mtime) {
4801                                 item->item.mtime = session->uid_validity;
4802                                 item->should_trash_cache = TRUE;
4803                         }
4804                         unlock_session(session);
4805                         return TRUE;
4806                 }
4807         } else {
4808                 ok = imap_status(session, IMAP_FOLDER(folder), item->item.path, IMAP_FOLDER_ITEM(item),
4809                                  &exists, &uid_next, &uid_val, &unseen, FALSE);
4810                 if (ok != MAILIMAP_NO_ERROR) {
4811                         return FALSE;
4812                 }
4813
4814                 debug_print("exists %d, item->item.total_msgs %d\n"
4815                             "\tunseen %d, item->item.unread_msgs %d\n"
4816                             "\tuid_next %d, item->uid_next %d\n"
4817                             "\tuid_val %d, item->item.mtime %d\n",
4818                             exists, item->item.total_msgs,unseen, item->item.unread_msgs,
4819                             uid_next, item->uid_next,uid_val, item->item.mtime);
4820                 if (exists != item->item.total_msgs
4821                     || unseen != item->item.unread_msgs
4822                     || uid_next != item->uid_next
4823                     || uid_val != item->item.mtime) {
4824                         debug_print("CHANGED (status)! scan_required\n");
4825                         item->last_change = time(NULL);
4826                         item->should_update = TRUE;
4827                         item->uid_next = uid_next;
4828                         if (uid_val != item->item.mtime) {
4829                                 item->item.mtime = uid_val;
4830                                 item->should_trash_cache = TRUE;
4831                         }
4832                         unlock_session(session);
4833                         return TRUE;
4834                 }
4835         }
4836         unlock_session(session);
4837
4838         item->should_update = FALSE;
4839         return FALSE;
4840 }
4841
4842 void imap_change_flags(Folder *folder, FolderItem *item, MsgInfo *msginfo, MsgPermFlags newflags)
4843 {
4844         IMAPSession *session;
4845         IMAPFlags flags_set = 0, flags_unset = 0;
4846         gint ok = MAILIMAP_NO_ERROR;
4847         MsgNumberList numlist;
4848         hashtable_data *ht_data = NULL;
4849
4850         g_return_if_fail(folder != NULL);
4851         g_return_if_fail(folder->klass == &imap_class);
4852         g_return_if_fail(item != NULL);
4853         g_return_if_fail(item->folder == folder);
4854         g_return_if_fail(msginfo != NULL);
4855         g_return_if_fail(msginfo->folder == item);
4856
4857         if (!MSG_IS_MARKED(msginfo->flags) &&  (newflags & MSG_MARKED))
4858                 flags_set |= IMAP_FLAG_FLAGGED;
4859         if ( MSG_IS_MARKED(msginfo->flags) && !(newflags & MSG_MARKED))
4860                 flags_unset |= IMAP_FLAG_FLAGGED;
4861
4862         if (!MSG_IS_UNREAD(msginfo->flags) &&  (newflags & MSG_UNREAD))
4863                 flags_unset |= IMAP_FLAG_SEEN;
4864         if ( MSG_IS_UNREAD(msginfo->flags) && !(newflags & MSG_UNREAD))
4865                 flags_set |= IMAP_FLAG_SEEN;
4866
4867         if (!MSG_IS_REPLIED(msginfo->flags) &&  (newflags & MSG_REPLIED))
4868                 flags_set |= IMAP_FLAG_ANSWERED;
4869         if ( MSG_IS_REPLIED(msginfo->flags) && !(newflags & MSG_REPLIED))
4870                 flags_unset |= IMAP_FLAG_ANSWERED;
4871
4872         if (!MSG_IS_FORWARDED(msginfo->flags) &&  (newflags & MSG_FORWARDED))
4873                 flags_set |= IMAP_FLAG_FORWARDED;
4874         if ( MSG_IS_FORWARDED(msginfo->flags) && !(newflags & MSG_FORWARDED))
4875                 flags_unset |= IMAP_FLAG_FORWARDED;
4876
4877         if (!MSG_IS_SPAM(msginfo->flags) &&  (newflags & MSG_SPAM)) {
4878                 flags_set |= IMAP_FLAG_SPAM;
4879                 flags_unset |= IMAP_FLAG_HAM;
4880         }
4881         if ( MSG_IS_SPAM(msginfo->flags) && !(newflags & MSG_SPAM)) {
4882                 flags_set |= IMAP_FLAG_HAM;
4883                 flags_unset |= IMAP_FLAG_SPAM;
4884         }
4885         if (!MSG_IS_DELETED(msginfo->flags) &&  (newflags & MSG_DELETED))
4886                 flags_set |= IMAP_FLAG_DELETED;
4887         if ( MSG_IS_DELETED(msginfo->flags) && !(newflags & MSG_DELETED))
4888                 flags_unset |= IMAP_FLAG_DELETED;
4889
4890         if (!flags_set && !flags_unset) {
4891                 /* the changed flags were not translatable to IMAP-speak.
4892                  * like MSG_POSTFILTERED, so just apply. */
4893                 msginfo->flags.perm_flags = newflags;
4894                 return;
4895         }
4896
4897         debug_print("getting session...\n");
4898         session = imap_session_get(folder);
4899         if (!session) {
4900                 return;
4901         }
4902
4903         if ((ok = imap_select(session, IMAP_FOLDER(folder), msginfo->folder,
4904             NULL, NULL, NULL, NULL, NULL, FALSE)) != MAILIMAP_NO_ERROR) {
4905                 return;
4906         }
4907         numlist.next = NULL;
4908         numlist.data = GINT_TO_POINTER(msginfo->msgnum);
4909
4910         if (IMAP_FOLDER_ITEM(item)->batching) {
4911                 /* instead of performing an UID STORE command for each message change,
4912                  * as a lot of them can change "together", we just fill in hashtables
4913                  * and defer the treatment so that we're able to send only one
4914                  * command.
4915                  */
4916                 debug_print("IMAP batch mode on, deferring flags change\n");
4917                 if (flags_set) {
4918                         ht_data = g_hash_table_lookup(IMAP_FOLDER_ITEM(item)->flags_set_table,
4919                                 GINT_TO_POINTER(flags_set));
4920                         if (ht_data == NULL) {
4921                                 ht_data = g_new0(hashtable_data, 1);
4922                                 ht_data->item = IMAP_FOLDER_ITEM(item);
4923                                 g_hash_table_insert(IMAP_FOLDER_ITEM(item)->flags_set_table,
4924                                         GINT_TO_POINTER(flags_set), ht_data);
4925                         }
4926                         ht_data->msglist = g_slist_prepend(ht_data->msglist, GINT_TO_POINTER(msginfo->msgnum));
4927                 }
4928                 if (flags_unset) {
4929                         ht_data = g_hash_table_lookup(IMAP_FOLDER_ITEM(item)->flags_unset_table,
4930                                 GINT_TO_POINTER(flags_unset));
4931                         if (ht_data == NULL) {
4932                                 ht_data = g_new0(hashtable_data, 1);
4933                                 ht_data->item = IMAP_FOLDER_ITEM(item);
4934                                 g_hash_table_insert(IMAP_FOLDER_ITEM(item)->flags_unset_table,
4935                                         GINT_TO_POINTER(flags_unset), ht_data);
4936                         }
4937                         ht_data->msglist = g_slist_prepend(ht_data->msglist,
4938                                         GINT_TO_POINTER(msginfo->msgnum));
4939                 }
4940         } else {
4941                 debug_print("IMAP changing flags\n");
4942                 if (flags_set) {
4943                         ok = imap_set_message_flags(session, IMAP_FOLDER_ITEM(item), &numlist, flags_set, NULL, TRUE);
4944                         if (ok != MAILIMAP_NO_ERROR) {
4945                                 return;
4946                         }
4947                 }
4948
4949                 if (flags_unset) {
4950                         ok = imap_set_message_flags(session, IMAP_FOLDER_ITEM(item), &numlist, flags_unset, NULL, FALSE);
4951                         if (ok != MAILIMAP_NO_ERROR) {
4952                                 return;
4953                         }
4954                 }
4955         }
4956         msginfo->flags.perm_flags = newflags;
4957         return;
4958 }
4959
4960 static gint imap_remove_msg(Folder *folder, FolderItem *item, gint uid)
4961 {
4962         gint ok;
4963         IMAPSession *session;
4964         gchar *dir;
4965         MsgNumberList numlist;
4966
4967         g_return_val_if_fail(folder != NULL, -1);
4968         g_return_val_if_fail(FOLDER_CLASS(folder) == &imap_class, -1);
4969         g_return_val_if_fail(item != NULL, -1);
4970
4971         debug_print("getting session...\n");
4972         session = imap_session_get(folder);
4973         if (!session) return -1;
4974
4975         ok = imap_select(session, IMAP_FOLDER(folder), item,
4976                          NULL, NULL, NULL, NULL, NULL, FALSE);
4977         if (ok != MAILIMAP_NO_ERROR) {
4978                 return ok;
4979         }
4980         numlist.next = NULL;
4981         numlist.data = GINT_TO_POINTER(uid);
4982
4983         ok = imap_set_message_flags
4984                 (session, IMAP_FOLDER_ITEM(item), &numlist, IMAP_FLAG_DELETED, NULL, TRUE);
4985         if (ok != MAILIMAP_NO_ERROR) {
4986                 log_warning(LOG_PROTOCOL, _("can't set deleted flags: %d\n"), uid);
4987                 return ok;
4988         }
4989
4990         ok = imap_cmd_expunge(session, folder->account->imap_use_trash);
4991
4992         if (ok != MAILIMAP_NO_ERROR) {
4993                 log_warning(LOG_PROTOCOL, _("can't expunge\n"));
4994                 return ok;
4995         }
4996
4997         IMAP_FOLDER_ITEM(item)->uid_list = g_slist_remove(
4998             IMAP_FOLDER_ITEM(item)->uid_list, numlist.data);
4999         dir = folder_item_get_path(item);
5000         if (is_dir_exist(dir))
5001                 remove_numbered_files(dir, uid, uid);
5002         g_free(dir);
5003         return MAILIMAP_NO_ERROR;
5004 }
5005
5006 static gint compare_msginfo(gconstpointer a, gconstpointer b)
5007 {
5008         return ((MsgInfo *)a)->msgnum - ((MsgInfo *)b)->msgnum;
5009 }
5010
5011 static guint gslist_find_next_num(MsgNumberList **list, guint num)
5012 {
5013         GSList *elem;
5014
5015         g_return_val_if_fail(list != NULL, -1);
5016
5017         for (elem = *list; elem != NULL; elem = g_slist_next(elem))
5018                 if (GPOINTER_TO_INT(elem->data) >= num)
5019                         break;
5020         *list = elem;
5021         return elem != NULL ? GPOINTER_TO_INT(elem->data) : (gint)-1;
5022 }
5023
5024 static gboolean flag_ok(IMAPFolderItem *item, guint flag)
5025 {
5026         if (item->ok_flags && g_slist_find(item->ok_flags, GUINT_TO_POINTER(flag))) {
5027                 debug_print("flag %d is OK\n", flag);
5028                 return TRUE;
5029         }
5030         if (item->can_create_flags == ITEM_CAN_CREATE_FLAGS) {
5031                 debug_print("creating flags is OK\n");
5032                 return TRUE;
5033         }
5034         return FALSE;
5035 }
5036
5037 /*
5038  * NEW and DELETED flags are not syncronized
5039  * - The NEW/RECENT flags in IMAP folders can not really be directly
5040  *   modified by Sylpheed
5041  * - The DELETE/DELETED flag in IMAP and Sylpheed don't have the same
5042  *   meaning, in IMAP it always removes the messages from the FolderItem
5043  *   in Sylpheed it can mean to move the message to trash
5044  */
5045
5046 typedef struct _get_flags_data {
5047         Folder *folder;
5048         FolderItem *item;
5049         MsgInfoList *msginfo_list;
5050         GHashTable *msgflags;
5051         gboolean full_search;
5052         gboolean done;
5053 } get_flags_data;
5054
5055 static /*gint*/ void *imap_get_flags_thread(void *data)
5056 {
5057         get_flags_data *stuff = (get_flags_data *)data;
5058         Folder *folder = stuff->folder;
5059         FolderItem *fitem = (FolderItem *) stuff->item;
5060         MsgInfoList *msginfo_list = stuff->msginfo_list;
5061         GHashTable *msgflags = stuff->msgflags;
5062         GSList *elem;
5063         carray * lep_uidtab;
5064         IMAPSession *session;
5065         gint ok;
5066         int r = MAILIMAP_NO_ERROR;
5067         GHashTable *flags_hash = NULL;
5068         GHashTable *tags_hash = NULL;
5069         gboolean full_search = stuff->full_search;
5070         GSList *sorted_list = NULL;
5071         GSList *unseen = NULL, *answered = NULL, *flagged = NULL, *deleted = NULL, *forwarded = NULL, *spam = NULL;
5072         GSList *seq_list, *cur;
5073         gboolean reverse_seen = FALSE;
5074         gboolean selected_folder;
5075         gint exists_cnt, unseen_cnt;
5076         gboolean got_alien_tags = FALSE;
5077
5078         session = imap_session_get(folder);
5079
5080         if (session == NULL) {
5081                 stuff->done = TRUE;
5082                 return GINT_TO_POINTER(-1);
5083         }
5084         selected_folder = (session->mbox != NULL) &&
5085                           (!strcmp(session->mbox, fitem->path));
5086
5087         lock_session(session);
5088         if (!selected_folder) {
5089                 ok = imap_select(session, IMAP_FOLDER(folder), fitem,
5090                         &exists_cnt, NULL, &unseen_cnt, NULL, NULL, TRUE);
5091                 if (ok != MAILIMAP_NO_ERROR) {
5092                         stuff->done = TRUE;
5093                         return GINT_TO_POINTER(-1);
5094                 }
5095
5096                 if (unseen_cnt > exists_cnt / 2)
5097                         reverse_seen = TRUE;
5098         }
5099         else {
5100                 if (fitem->unread_msgs > fitem->total_msgs / 2)
5101                         reverse_seen = TRUE;
5102         }
5103
5104         sorted_list = g_slist_sort(g_slist_copy(msginfo_list), compare_msginfo);
5105         if (!full_search) {
5106                 seq_list = imap_get_lep_set_from_msglist(IMAP_FOLDER(folder), msginfo_list);
5107         } else {
5108                 struct mailimap_set * set;
5109                 set = mailimap_set_new_interval(1, 0);
5110                 seq_list = g_slist_append(NULL, set);
5111         }
5112
5113         if (folder->account && folder->account->low_bandwidth) {
5114                 for (cur = seq_list; cur != NULL; cur = g_slist_next(cur)) {
5115                         struct mailimap_set * imapset;
5116                         clist * lep_uidlist;
5117                         int r;
5118
5119                         imapset = cur->data;
5120                         if (reverse_seen) {
5121                                 r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_SEEN, NULL,
5122                                                          NULL, full_search ? NULL:imapset, &lep_uidlist);
5123                         }
5124                         else {
5125                                 r = imap_threaded_search(folder,
5126                                                          IMAP_SEARCH_TYPE_UNSEEN, NULL,
5127                                                          NULL, full_search ? NULL:imapset, &lep_uidlist);
5128                         }
5129                         if (r == MAILIMAP_NO_ERROR) {
5130                                 GSList * uidlist;
5131
5132                                 uidlist = imap_uid_list_from_lep(lep_uidlist, NULL);
5133                                 mailimap_search_result_free(lep_uidlist);
5134
5135                                 unseen = g_slist_concat(unseen, uidlist);
5136                         } else {
5137                                 imap_handle_error(SESSION(session), NULL, r);
5138                                 goto bail;
5139                         }
5140
5141                         r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_FLAGGED, NULL,
5142                                                  NULL, full_search ? NULL:imapset, &lep_uidlist);
5143                         if (r == MAILIMAP_NO_ERROR) {
5144                                 GSList * uidlist;
5145
5146                                 uidlist = imap_uid_list_from_lep(lep_uidlist, NULL);
5147                                 mailimap_search_result_free(lep_uidlist);
5148
5149                                 flagged = g_slist_concat(flagged, uidlist);
5150                         } else {
5151                                 imap_handle_error(SESSION(session), NULL, r);
5152                                 goto bail;
5153                         }
5154
5155                         if (fitem->opened || fitem->processing_pending || fitem == folder->inbox) {
5156                                 r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_ANSWERED, NULL,
5157                                                          NULL, full_search ? NULL:imapset, &lep_uidlist);
5158                                 if (r == MAILIMAP_NO_ERROR) {
5159                                         GSList * uidlist;
5160
5161                                         uidlist = imap_uid_list_from_lep(lep_uidlist, NULL);
5162                                         mailimap_search_result_free(lep_uidlist);
5163
5164                                         answered = g_slist_concat(answered, uidlist);
5165                                 } else {
5166                                         imap_handle_error(SESSION(session), NULL, r);
5167                                         goto bail;
5168                                 }
5169
5170                                 if (flag_ok(IMAP_FOLDER_ITEM(fitem), IMAP_FLAG_FORWARDED)) {
5171                                         r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_FORWARDED, NULL,
5172                                                                  NULL, full_search ? NULL:imapset, &lep_uidlist);
5173                                         if (r == MAILIMAP_NO_ERROR) {
5174                                                 GSList * uidlist;
5175
5176                                                 uidlist = imap_uid_list_from_lep(lep_uidlist, NULL);
5177                                                 mailimap_search_result_free(lep_uidlist);
5178
5179                                                 forwarded = g_slist_concat(forwarded, uidlist);
5180                                         } else {
5181                                                 imap_handle_error(SESSION(session), NULL, r);
5182                                                 goto bail;
5183                                         }
5184                                 }
5185
5186                                 if (flag_ok(IMAP_FOLDER_ITEM(fitem), IMAP_FLAG_SPAM)) {
5187                                         r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_SPAM, NULL,
5188                                                                  NULL, full_search ? NULL:imapset, &lep_uidlist);
5189                                         if (r == MAILIMAP_NO_ERROR) {
5190                                                 GSList * uidlist;
5191
5192                                                 uidlist = imap_uid_list_from_lep(lep_uidlist, NULL);
5193                                                 mailimap_search_result_free(lep_uidlist);
5194
5195                                                 spam = g_slist_concat(spam, uidlist);
5196                                         } else {
5197                                                 imap_handle_error(SESSION(session), NULL, r);
5198                                                 goto bail;
5199                                         }
5200                                 }
5201
5202                                 r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_DELETED, NULL,
5203                                                          NULL, full_search ? NULL:imapset, &lep_uidlist);
5204                                 if (r == MAILIMAP_NO_ERROR) {
5205                                         GSList * uidlist;
5206
5207                                         uidlist = imap_uid_list_from_lep(lep_uidlist, NULL);
5208                                         mailimap_search_result_free(lep_uidlist);
5209
5210                                         deleted = g_slist_concat(deleted, uidlist);
5211                                 } else {
5212                                         imap_handle_error(SESSION(session), NULL, r);
5213                                         goto bail;
5214                                 }
5215                         }
5216                 }
5217
5218         } else {
5219                 r = imap_threaded_fetch_uid_flags(folder, 1, &lep_uidtab);
5220                 if (r == MAILIMAP_NO_ERROR) {
5221                         flags_hash = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, NULL);
5222                         tags_hash = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, NULL);
5223                         imap_flags_hash_from_lep_uid_flags_tab(lep_uidtab, flags_hash, tags_hash);
5224                         imap_fetch_uid_flags_list_free(lep_uidtab);
5225                 } else {
5226                         imap_handle_error(SESSION(session), NULL, r);
5227                         goto bail;
5228                 }
5229         }
5230
5231 bail:
5232         if (r == MAILIMAP_NO_ERROR)
5233                 unlock_session(session);
5234
5235         for (elem = sorted_list; elem != NULL; elem = g_slist_next(elem)) {
5236                 MsgInfo *msginfo;
5237                 MsgPermFlags flags, oldflags;
5238                 gboolean wasnew;
5239
5240                 msginfo = (MsgInfo *) elem->data;
5241                 flags = msginfo->flags.perm_flags;
5242                 wasnew = (flags & MSG_NEW);
5243                 oldflags = flags & ~(MSG_NEW|MSG_UNREAD|MSG_REPLIED|MSG_FORWARDED|MSG_MARKED|MSG_DELETED|MSG_SPAM);
5244
5245                 if (folder->account && folder->account->low_bandwidth) {
5246                         if (fitem->opened || fitem->processing_pending || fitem == folder->inbox) {
5247                                 flags &= ~((reverse_seen ? 0 : MSG_UNREAD | MSG_NEW) | MSG_REPLIED | MSG_FORWARDED | MSG_MARKED | MSG_SPAM);
5248                         } else {
5249                                 flags &= ~((reverse_seen ? 0 : MSG_UNREAD | MSG_NEW | MSG_MARKED));
5250                         }
5251                         if (reverse_seen)
5252                                 flags |= MSG_UNREAD | (wasnew ? MSG_NEW : 0);
5253                         if (gslist_find_next_num(&unseen, msginfo->msgnum) == msginfo->msgnum) {
5254                                 if (!reverse_seen) {
5255                                         flags |= MSG_UNREAD | (wasnew ? MSG_NEW : 0);
5256                                 } else {
5257                                         flags &= ~(MSG_UNREAD | MSG_NEW);
5258                                 }
5259                         }
5260
5261                         if (gslist_find_next_num(&flagged, msginfo->msgnum) == msginfo->msgnum)
5262                                 flags |= MSG_MARKED;
5263                         else
5264                                 flags &= ~MSG_MARKED;
5265
5266                         if (fitem->opened || fitem->processing_pending || fitem == folder->inbox) {
5267                                 if (gslist_find_next_num(&answered, msginfo->msgnum) == msginfo->msgnum)
5268                                         flags |= MSG_REPLIED;
5269                                 else
5270                                         flags &= ~MSG_REPLIED;
5271                                 if (gslist_find_next_num(&forwarded, msginfo->msgnum) == msginfo->msgnum)
5272                                         flags |= MSG_FORWARDED;
5273                                 else
5274                                         flags &= ~MSG_FORWARDED;
5275                                 if (gslist_find_next_num(&spam, msginfo->msgnum) == msginfo->msgnum)
5276                                         flags |= MSG_SPAM;
5277                                 else
5278                                         flags &= ~MSG_SPAM;
5279                                 if (gslist_find_next_num(&deleted, msginfo->msgnum) == msginfo->msgnum)
5280                                         flags |= MSG_DELETED;
5281                                 else
5282                                         flags &= ~MSG_DELETED;
5283                         }
5284                 } else {
5285                         if (flags_hash != NULL) {
5286
5287                                 flags = GPOINTER_TO_INT(g_hash_table_lookup(flags_hash,
5288                                                 GINT_TO_POINTER(msginfo->msgnum)));
5289                         }
5290
5291                         if ((flags & MSG_UNREAD) == 0)
5292                                 flags &= ~MSG_NEW;
5293                         else if (wasnew)
5294                                 flags |= MSG_NEW;
5295                         flags |= oldflags;
5296
5297                         if (tags_hash != NULL) {
5298                                 GSList *tags = g_hash_table_lookup(tags_hash, GINT_TO_POINTER(msginfo->msgnum));
5299                                 GSList *cur;
5300
5301                                 g_slist_free(msginfo->tags);
5302                                 msginfo->tags = NULL;
5303
5304                                 for (cur = tags; cur; cur = cur->next) {
5305                                         gchar *real_tag = imap_modified_utf7_to_utf8(cur->data, TRUE);
5306                                         gint id = 0;
5307                                         id = tags_get_id_for_str(real_tag);
5308                                         if (id == -1) {
5309                                                 id = tags_add_tag(real_tag);
5310                                                 got_alien_tags = TRUE;
5311                                         }
5312                                         msginfo->tags = g_slist_append(
5313                                                                 msginfo->tags,
5314                                                                 GINT_TO_POINTER(id));
5315                                         g_free(real_tag);
5316                                 }
5317                                 slist_free_strings_full(tags);
5318                         }
5319                 }
5320
5321                 g_hash_table_insert(msgflags, msginfo, GINT_TO_POINTER(flags));
5322         }
5323
5324         if (got_alien_tags) {
5325                 tags_write_tags();
5326                 main_window_reflect_tags_changes(mainwindow_get_mainwindow());
5327         }
5328
5329         if (flags_hash)
5330                 g_hash_table_destroy(flags_hash);
5331         if (tags_hash)
5332                 g_hash_table_destroy(tags_hash);
5333
5334         imap_lep_set_free(seq_list);
5335         g_slist_free(flagged);
5336         g_slist_free(deleted);
5337         g_slist_free(answered);
5338         g_slist_free(forwarded);
5339         g_slist_free(spam);
5340         g_slist_free(unseen);
5341         g_slist_free(sorted_list);
5342
5343         stuff->done = TRUE;
5344         return GINT_TO_POINTER(0);
5345 }
5346
5347 static gint imap_get_flags(Folder *folder, FolderItem *item,
5348                            MsgInfoList *msginfo_list, GHashTable *msgflags)
5349 {
5350         gint result;
5351         get_flags_data *data = g_new0(get_flags_data, 1);
5352         data->done = FALSE;
5353         data->folder = folder;
5354         data->item = item;
5355         data->msginfo_list = msginfo_list;
5356         data->msgflags = msgflags;
5357         data->full_search = FALSE;
5358
5359         GSList *tmp = NULL, *cur;
5360
5361         if (prefs_common.work_offline &&
5362             !inc_offline_should_override(FALSE,
5363                 _("Claws Mail needs network access in order "
5364                   "to access the IMAP server."))) {
5365                 g_free(data);
5366                 return -1;
5367         }
5368
5369         tmp = folder_item_get_msg_list(item);
5370
5371         if (g_slist_length(tmp) <= g_slist_length(msginfo_list))
5372                 data->full_search = TRUE;
5373
5374         for (cur = tmp; cur; cur = cur->next)
5375                 procmsg_msginfo_free((MsgInfo *)cur->data);
5376
5377         g_slist_free(tmp);
5378
5379         result = GPOINTER_TO_INT(imap_get_flags_thread(data));
5380
5381         g_free(data);
5382         return result;
5383
5384 }
5385
5386 static gboolean process_flags(gpointer key, gpointer value, gpointer user_data)
5387 {
5388         gboolean flags_set = GPOINTER_TO_INT(user_data);
5389         gint flags_value = GPOINTER_TO_INT(key);
5390         hashtable_data *data = (hashtable_data *)value;
5391         IMAPFolderItem *_item = data->item;
5392         FolderItem *item = (FolderItem *)_item;
5393         gint ok = MAILIMAP_ERROR_BAD_STATE;
5394         IMAPSession *session = NULL;
5395
5396         debug_print("getting session...\n");
5397         session = imap_session_get(item->folder);
5398
5399         data->msglist = g_slist_reverse(data->msglist);
5400
5401         debug_print("IMAP %ssetting flags to %d for %d messages\n",
5402                 flags_set?"":"un",
5403                 flags_value,
5404                 g_slist_length(data->msglist));
5405
5406         lock_session(session);
5407         if (session) {
5408                 ok = imap_select(session, IMAP_FOLDER(item->folder), item,
5409                          NULL, NULL, NULL, NULL, NULL, FALSE);
5410         }
5411         if (ok == MAILIMAP_NO_ERROR) {
5412                 ok = imap_set_message_flags(session, IMAP_FOLDER_ITEM(item),
5413                         data->msglist, flags_value, NULL, flags_set);
5414         } else {
5415                 g_warning("can't select mailbox %s\n", item->path);
5416         }
5417
5418         if (!is_fatal(ok))
5419                 unlock_session(session);
5420
5421         g_slist_free(data->msglist);
5422         g_free(data);
5423         return TRUE;
5424 }
5425
5426 static gboolean process_tags(gpointer key, gpointer value, gpointer user_data)
5427 {
5428         gboolean tags_set = GPOINTER_TO_INT(user_data);
5429         TagsData *data = (TagsData *)value;
5430         IMAPFolderItem *_item = data->item;
5431         FolderItem *item = (FolderItem *)_item;
5432         gchar *str = data->str;
5433         gint ok = MAILIMAP_ERROR_BAD_STATE;
5434         IMAPSession *session = NULL;
5435
5436         debug_print("getting session...\n");
5437         session = imap_session_get(item->folder);
5438
5439         data->msglist = g_slist_reverse(data->msglist);
5440
5441         debug_print("IMAP %ssetting tags %s for %d messages\n",
5442                 tags_set?"":"un",
5443                 str,
5444                 g_slist_length(data->msglist));
5445
5446         lock_session(session);
5447         if (session) {
5448                 ok = imap_select(session, IMAP_FOLDER(item->folder), item,
5449                          NULL, NULL, NULL, NULL, NULL, FALSE);
5450         }
5451         if (ok == MAILIMAP_NO_ERROR) {
5452                 GSList list;
5453                 list.data = str;
5454                 list.next = NULL;
5455                 ok = imap_set_message_flags(session, IMAP_FOLDER_ITEM(item),
5456                         data->msglist, 0, &list, tags_set);
5457         } else {
5458                 g_warning("can't select mailbox %s\n", item->path);
5459         }
5460
5461         if (!is_fatal(ok))
5462                 unlock_session(session);
5463
5464         g_slist_free(data->msglist);
5465         g_free(data->str);
5466         g_free(data);
5467         return TRUE;
5468 }
5469
5470 static void process_hashtable(IMAPFolderItem *item)
5471 {
5472         if (item->flags_set_table) {
5473                 g_hash_table_foreach_remove(item->flags_set_table, process_flags, GINT_TO_POINTER(TRUE));
5474                 g_hash_table_destroy(item->flags_set_table);
5475                 item->flags_set_table = NULL;
5476         }
5477         if (item->flags_unset_table) {
5478                 g_hash_table_foreach_remove(item->flags_unset_table, process_flags, GINT_TO_POINTER(FALSE));
5479                 g_hash_table_destroy(item->flags_unset_table);
5480                 item->flags_unset_table = NULL;
5481         }
5482         if (item->tags_set_table) {
5483                 g_hash_table_foreach_remove(item->tags_set_table, process_tags, GINT_TO_POINTER(TRUE));
5484                 g_hash_table_destroy(item->tags_set_table);
5485                 item->tags_set_table = NULL;
5486         }
5487         if (item->tags_unset_table) {
5488                 g_hash_table_foreach_remove(item->tags_unset_table, process_tags, GINT_TO_POINTER(FALSE));
5489                 g_hash_table_destroy(item->tags_unset_table);
5490                 item->tags_unset_table = NULL;
5491         }
5492
5493 }
5494
5495 static void imap_set_batch (Folder *folder, FolderItem *_item, gboolean batch)
5496 {
5497         IMAPFolderItem *item = (IMAPFolderItem *)_item;
5498         IMAPSession *session;
5499
5500         g_return_if_fail(item != NULL);
5501
5502         if (item->batching == batch)
5503                 return;
5504
5505         if (batch) {
5506                 item->batching = TRUE;
5507                 debug_print("IMAP switching to batch mode\n");
5508                 if (!item->flags_set_table) {
5509                         item->flags_set_table = g_hash_table_new(NULL, g_direct_equal);
5510                 }
5511                 if (!item->flags_unset_table) {
5512                         item->flags_unset_table = g_hash_table_new(NULL, g_direct_equal);
5513                 }
5514                 if (!item->tags_set_table) {
5515                         item->tags_set_table = g_hash_table_new(NULL, g_direct_equal);
5516                 }
5517                 if (!item->tags_unset_table) {
5518                         item->tags_unset_table = g_hash_table_new(NULL, g_direct_equal);
5519                 }
5520                 session = imap_session_get(folder);
5521                 if (session) {
5522                         imap_refresh_sensitivity(session);
5523                         session->sens_update_block = TRUE;
5524                 }
5525         } else {
5526                 debug_print("IMAP switching away from batch mode\n");
5527                 /* process stuff */
5528                 process_hashtable(item);
5529                 item->batching = FALSE;
5530                 session = imap_session_get(folder);
5531                 if (session) {
5532                         session->sens_update_block = FALSE;
5533                         imap_refresh_sensitivity(session);
5534                 }
5535         }
5536 }
5537
5538
5539
5540 /* data types conversion libetpan <-> claws */
5541
5542
5543
5544 #define ETPAN_IMAP_MB_MARKED      1
5545 #define ETPAN_IMAP_MB_UNMARKED    2
5546 #define ETPAN_IMAP_MB_NOSELECT    4
5547 #define ETPAN_IMAP_MB_NOINFERIORS 8
5548
5549 static int imap_flags_to_flags(struct mailimap_mbx_list_flags * imap_flags)
5550 {
5551   int flags;
5552   clistiter * cur;
5553
5554   flags = 0;
5555   if (imap_flags->mbf_type == MAILIMAP_MBX_LIST_FLAGS_SFLAG) {
5556     switch (imap_flags->mbf_sflag) {
5557     case MAILIMAP_MBX_LIST_SFLAG_MARKED:
5558       flags |= ETPAN_IMAP_MB_MARKED;
5559       break;
5560     case MAILIMAP_MBX_LIST_SFLAG_NOSELECT:
5561       flags |= ETPAN_IMAP_MB_NOSELECT;
5562       break;
5563     case MAILIMAP_MBX_LIST_SFLAG_UNMARKED:
5564       flags |= ETPAN_IMAP_MB_UNMARKED;
5565       break;
5566     }
5567   }
5568
5569   if (imap_flags->mbf_oflags) {
5570     for(cur = clist_begin(imap_flags->mbf_oflags) ; cur != NULL ;
5571         cur = clist_next(cur)) {
5572       struct mailimap_mbx_list_oflag * oflag;
5573
5574       oflag = clist_content(cur);
5575
5576       switch (oflag->of_type) {
5577       case MAILIMAP_MBX_LIST_OFLAG_NOINFERIORS:
5578         flags |= ETPAN_IMAP_MB_NOINFERIORS;
5579         break;
5580       }
5581     }
5582   }
5583   return flags;
5584 }
5585
5586 static GSList * imap_list_from_lep(IMAPFolder * folder,
5587                                    clist * list, const gchar * real_path, gboolean all)
5588 {
5589         clistiter * iter;
5590         GSList * item_list = NULL, *llast = NULL;
5591
5592         if (list) {
5593                 for(iter = clist_begin(list) ; iter != NULL ;
5594                     iter = clist_next(iter)) {
5595                         struct mailimap_mailbox_list * mb;
5596                         int flags;
5597                         char delimiter;
5598                         char * name;
5599                         char * dup_name;
5600                         gchar * base;
5601                         gchar * loc_name;
5602                         gchar * loc_path;
5603                         FolderItem *new_item;
5604
5605                         mb = clist_content(iter);
5606
5607                         if (mb == NULL)
5608                                 continue;
5609
5610                         flags = 0;
5611                         if (mb->mb_flag != NULL)
5612                                 flags = imap_flags_to_flags(mb->mb_flag);
5613
5614                         delimiter = mb->mb_delimiter;
5615                         name = mb->mb_name;
5616
5617                         dup_name = strdup(name);
5618                         if (delimiter != '\0')
5619                                 subst_char(dup_name, delimiter, '/');
5620
5621                         base = g_path_get_basename(dup_name);
5622                         if (base[0] == '.') {
5623                                 g_free(base);
5624                                 free(dup_name);
5625                                 continue;
5626                         }
5627                         if (!all && path_cmp(name, real_path) == 0) {
5628                                 g_free(base);
5629                                 free(dup_name);
5630                                 continue;
5631                         }
5632
5633                         if (!all && dup_name[strlen(dup_name)-1] == '/') {
5634                                 dup_name[strlen(dup_name)-1] = '\0';
5635                         }
5636
5637                         loc_name = imap_modified_utf7_to_utf8(base, FALSE);
5638                         loc_path = imap_modified_utf7_to_utf8(dup_name, FALSE);
5639
5640                         new_item = folder_item_new(FOLDER(folder), loc_name, loc_path);
5641                         if ((flags & ETPAN_IMAP_MB_NOINFERIORS) != 0)
5642                                 new_item->no_sub = TRUE;
5643                         if (strcasecmp(dup_name, "INBOX") != 0 &&
5644                             ((flags & ETPAN_IMAP_MB_NOSELECT) != 0))
5645                                 new_item->no_select = TRUE;
5646
5647                         if (item_list == NULL)
5648                                 llast = item_list = g_slist_append(item_list, new_item);
5649                         else {
5650                                 llast = g_slist_append(llast, new_item);
5651                                 llast = llast->next;
5652                         }
5653                         debug_print("folder '%s' found.\n", loc_path);
5654                         g_free(base);
5655                         g_free(loc_path);
5656                         g_free(loc_name);
5657
5658                         free(dup_name);
5659                 }
5660         }
5661         return item_list;
5662 }
5663
5664 static GSList * imap_get_lep_set_from_numlist(IMAPFolder *folder, MsgNumberList *numlist)
5665 {
5666         GSList *sorted_list, *cur;
5667         guint first, last, next;
5668         GSList *ret_list = NULL, *llast = NULL;
5669         struct mailimap_set * current_set;
5670         unsigned int item_count;
5671
5672         if (numlist == NULL)
5673                 return NULL;
5674
5675         current_set = mailimap_set_new_empty();
5676
5677         sorted_list = g_slist_copy(numlist);
5678         sorted_list = g_slist_sort(sorted_list, g_int_compare);
5679
5680         first = GPOINTER_TO_INT(sorted_list->data);
5681
5682         item_count = 0;
5683         for (cur = sorted_list; cur != NULL; cur = g_slist_next(cur)) {
5684                 if (GPOINTER_TO_INT(cur->data) == 0)
5685                         continue;
5686
5687                 item_count ++;
5688
5689                 last = GPOINTER_TO_INT(cur->data);
5690                 if (cur->next)
5691                         next = GPOINTER_TO_INT(cur->next->data);
5692                 else
5693                         next = 0;
5694
5695                 if (last + 1 != next || next == 0 || item_count >= folder->max_set_size) {
5696
5697                         struct mailimap_set_item * item;
5698                         item = mailimap_set_item_new(first, last);
5699                         mailimap_set_add(current_set, item);
5700
5701                         first = next;
5702
5703                         if (item_count >= folder->max_set_size) {
5704                                 if (ret_list == NULL)
5705                                         llast = ret_list = g_slist_append(ret_list,
5706                                                           current_set);
5707                                 else {
5708                                         llast = g_slist_append(llast, current_set);
5709                                         llast = llast->next;
5710                                 }
5711
5712                                 current_set = mailimap_set_new_empty();
5713                                 item_count = 0;
5714                         }
5715                 }
5716         }
5717
5718         if (clist_count(current_set->set_list) > 0) {
5719                 ret_list = g_slist_append(ret_list,
5720                                           current_set);
5721         }
5722
5723         g_slist_free(sorted_list);
5724
5725         return ret_list;
5726 }
5727
5728 static GSList * imap_get_lep_set_from_msglist(IMAPFolder *folder, MsgInfoList *msglist)
5729 {
5730         MsgNumberList *numlist = NULL;
5731         GSList *seq_list;
5732
5733         numlist = procmsg_get_number_list_for_msgs(msglist);
5734
5735         seq_list = imap_get_lep_set_from_numlist(folder, numlist);
5736         g_slist_free(numlist);
5737
5738         return seq_list;
5739 }
5740
5741 static GSList * imap_uid_list_from_lep(clist * list, gint* length)
5742 {
5743         clistiter * iter;
5744         GSList * result;
5745         gint len = 0;
5746
5747         result = NULL;
5748
5749         if (list) {
5750                 for(iter = clist_begin(list) ; iter != NULL ;
5751                     iter = clist_next(iter)) {
5752                         uint32_t * puid;
5753
5754                         puid = clist_content(iter);
5755                         result = g_slist_prepend(result, GINT_TO_POINTER(* puid));
5756                         len++;
5757                 }
5758                 result = g_slist_reverse(result);
5759         }
5760         if (length)
5761                 *length = len;
5762         return result;
5763 }
5764
5765 static GSList * imap_uid_list_from_lep_tab(carray * list)
5766 {
5767         unsigned int i;
5768         GSList * result;
5769
5770         result = NULL;
5771
5772         for(i = 0 ; i < carray_count(list) ; i ++) {
5773                 uint32_t * puid;
5774
5775                 puid = carray_get(list, i);
5776                 result = g_slist_prepend(result, GINT_TO_POINTER(* puid));
5777         }
5778         result = g_slist_reverse(result);
5779         return result;
5780 }
5781
5782 static void imap_flags_hash_from_lep_uid_flags_tab(carray * list,
5783                                                    GHashTable * hash,
5784                                                    GHashTable * tags_hash)
5785 {
5786         unsigned int i;
5787
5788         for(i = 0 ; i < carray_count(list) ; i += 3) {
5789                 uint32_t * puid;
5790                 int * pflags;
5791                 GSList *tags;
5792
5793                 puid = carray_get(list, i);
5794                 pflags = carray_get(list, i + 1);
5795                 tags = carray_get(list, i + 2);
5796
5797                 g_hash_table_insert(hash, GINT_TO_POINTER(*puid), GINT_TO_POINTER(* pflags));
5798                 g_hash_table_insert(tags_hash, GINT_TO_POINTER(*puid), tags);
5799         }
5800 }
5801
5802 static MsgInfo *imap_envelope_from_lep(struct imap_fetch_env_info * info,
5803                                        FolderItem *item)
5804 {
5805         MsgInfo *msginfo = NULL;
5806         guint32 uid = 0;
5807         goffset size = 0;
5808         MsgFlags flags = {0, 0};
5809
5810         if (info->headers == NULL)
5811                 return NULL;
5812
5813         MSG_SET_TMP_FLAGS(flags, MSG_IMAP);
5814         if (folder_has_parent_of_type(item, F_QUEUE)) {
5815                 MSG_SET_TMP_FLAGS(flags, MSG_QUEUED);
5816         } else if (folder_has_parent_of_type(item, F_DRAFT)) {
5817                 MSG_SET_TMP_FLAGS(flags, MSG_DRAFT);
5818         }
5819         flags.perm_flags = info->flags;
5820
5821         uid = info->uid;
5822         size = (goffset) info->size;
5823         msginfo = procheader_parse_str(info->headers, flags, FALSE, FALSE);
5824
5825         if (msginfo) {
5826                 msginfo->msgnum = uid;
5827                 msginfo->size = size;
5828         }
5829
5830         return msginfo;
5831 }
5832
5833 static void imap_lep_set_free(GSList *seq_list)
5834 {
5835         GSList * cur;
5836
5837         for(cur = seq_list ; cur != NULL ; cur = g_slist_next(cur)) {
5838                 struct mailimap_set * imapset;
5839
5840                 imapset = cur->data;
5841                 mailimap_set_free(imapset);
5842         }
5843         g_slist_free(seq_list);
5844 }
5845
5846 static struct mailimap_flag_list * imap_flag_to_lep(IMAPFolderItem *item, IMAPFlags flags, GSList *tags)
5847 {
5848         struct mailimap_flag_list * flag_list;
5849         GSList *cur = tags;
5850
5851         flag_list = mailimap_flag_list_new_empty();
5852
5853         if (IMAP_IS_SEEN(flags))
5854                 mailimap_flag_list_add(flag_list,
5855                                        mailimap_flag_new_seen());
5856         if (IMAP_IS_ANSWERED(flags))
5857                 mailimap_flag_list_add(flag_list,
5858                                        mailimap_flag_new_answered());
5859         if (IMAP_IS_FLAGGED(flags))
5860                 mailimap_flag_list_add(flag_list,
5861                                        mailimap_flag_new_flagged());
5862         if (IMAP_IS_DELETED(flags))
5863                 mailimap_flag_list_add(flag_list,
5864                                        mailimap_flag_new_deleted());
5865         if (IMAP_IS_DRAFT(flags))
5866                 mailimap_flag_list_add(flag_list,
5867                                        mailimap_flag_new_draft());
5868         if (IMAP_IS_FORWARDED(flags) && flag_ok(item, IMAP_FLAG_FORWARDED))
5869                 mailimap_flag_list_add(flag_list,
5870                                        mailimap_flag_new_flag_keyword(strdup(RTAG_FORWARDED)));
5871         if (IMAP_IS_SPAM(flags) && flag_ok(item, IMAP_FLAG_SPAM))
5872                 mailimap_flag_list_add(flag_list,
5873                                        mailimap_flag_new_flag_keyword(strdup(RTAG_JUNK)));
5874         else if (IMAP_IS_HAM(flags) && flag_ok(item, IMAP_FLAG_HAM))
5875                 mailimap_flag_list_add(flag_list,
5876                                        mailimap_flag_new_flag_keyword(strdup(RTAG_NON_JUNK)));
5877
5878         for (; cur; cur = cur->next) {
5879                 gchar *enc_str =
5880                         imap_utf8_to_modified_utf7(cur->data, TRUE);
5881                 g_strstrip(enc_str);
5882
5883                 mailimap_flag_list_add(flag_list,
5884                         mailimap_flag_new_flag_keyword(enc_str));
5885         }
5886
5887         return flag_list;
5888 }
5889
5890 guint imap_folder_get_refcnt(Folder *folder)
5891 {
5892         return ((IMAPFolder *)folder)->refcnt;
5893 }
5894
5895 void imap_folder_ref(Folder *folder)
5896 {
5897         ((IMAPFolder *)folder)->refcnt++;
5898 }
5899
5900 void imap_disconnect_all(gboolean have_connectivity)
5901 {
5902         GList *list;
5903         gboolean short_timeout;
5904 #ifdef HAVE_NETWORKMANAGER_SUPPORT
5905         GError *error;
5906 #endif
5907
5908 #ifdef HAVE_NETWORKMANAGER_SUPPORT
5909         error = NULL;
5910         short_timeout = !networkmanager_is_online(&error);
5911         if(error) {
5912                 short_timeout = TRUE;
5913                 g_error_free(error);
5914         }
5915 #else
5916         short_timeout = TRUE;
5917 #endif
5918
5919         if(short_timeout)
5920                 imap_main_set_timeout(1);
5921
5922         for (list = account_get_list(); list != NULL; list = list->next) {
5923                 PrefsAccount *account = list->data;
5924                 if (account->protocol == A_IMAP4) {
5925                         RemoteFolder *folder = (RemoteFolder *)account->folder;
5926                         if (folder && folder->session) {
5927                                 if (imap_is_busy(FOLDER(folder)))
5928                                         imap_threaded_cancel(FOLDER(folder));
5929
5930                                 IMAPSession *session = (IMAPSession *)folder->session;
5931                                 if (have_connectivity)
5932                                         imap_threaded_disconnect(FOLDER(folder));
5933                                 SESSION(session)->state = SESSION_DISCONNECTED;
5934                                 SESSION(session)->sock = NULL;
5935                                 imap_safe_destroy(session);
5936                                 folder->session = NULL;
5937                         }
5938                 }
5939         }
5940
5941         if(short_timeout)
5942                 imap_main_set_timeout(prefs_common.io_timeout_secs);
5943 }
5944
5945 void imap_folder_unref(Folder *folder)
5946 {
5947         if (((IMAPFolder *)folder)->refcnt > 0)
5948                 ((IMAPFolder *)folder)->refcnt--;
5949 }
5950
5951 void imap_cancel_all(void)
5952 {
5953         GList *folderlist;
5954         GList *cur;
5955
5956         folderlist = folder_get_list();
5957         for (cur = folderlist; cur != NULL; cur = g_list_next(cur)) {
5958                 Folder *folder = (Folder *) cur->data;
5959
5960                 if (folder->klass == &imap_class) {
5961                         if (imap_is_busy(folder)) {
5962                                 IMAPSession *imap_session;
5963                                 RemoteFolder *rfolder;
5964
5965                                 g_printerr("cancelled\n");
5966                                 imap_threaded_cancel(folder);
5967                                 rfolder = (RemoteFolder *) folder;
5968                                 imap_session = (IMAPSession *) rfolder->session;
5969                                 if (imap_session)
5970                                         imap_session->cancelled = 1;
5971                         }
5972                 }
5973         }
5974 }
5975
5976 gboolean imap_cancel_all_enabled(void)
5977 {
5978         GList *folderlist;
5979         GList *cur;
5980
5981         folderlist = folder_get_list();
5982         for (cur = folderlist; cur != NULL; cur = g_list_next(cur)) {
5983                 Folder *folder = (Folder *) cur->data;
5984
5985                 if (folder->klass == &imap_class) {
5986                         if (imap_is_busy(folder)) {
5987                                 return TRUE;
5988                         }
5989                 }
5990         }
5991
5992         return FALSE;
5993 }
5994
5995 static gboolean imap_is_busy(Folder *folder)
5996 {
5997         IMAPSession *imap_session;
5998         RemoteFolder *rfolder;
5999
6000         rfolder = (RemoteFolder *) folder;
6001         imap_session = (IMAPSession *) rfolder->session;
6002         if (imap_session == NULL)
6003                 return FALSE;
6004
6005         return imap_session->busy;
6006 }
6007
6008 #else /* HAVE_LIBETPAN */
6009
6010 static FolderClass imap_class;
6011
6012 static XMLTag *imap_item_get_xml(Folder *folder, FolderItem *item);
6013 static void imap_item_set_xml(Folder *folder, FolderItem *item, XMLTag *tag);
6014
6015 static Folder   *imap_folder_new        (const gchar    *name,
6016                                          const gchar    *path)
6017 {
6018         static gboolean missing_imap_warning = TRUE;
6019         if (missing_imap_warning) {
6020                 missing_imap_warning = FALSE;
6021                 alertpanel_error(
6022                         _("You have one or more IMAP accounts "
6023                           "defined. However this version of "
6024                           "Claws Mail has been built without "
6025                           "IMAP support; your IMAP account(s) are "
6026                           "disabled.\n\n"
6027                           "You probably need to "
6028                           "install libetpan and recompile "
6029                           "Claws Mail."));
6030         }
6031         return NULL;
6032 }
6033 static gint     imap_create_tree        (Folder         *folder)
6034 {
6035         return -1;
6036 }
6037 static FolderItem *imap_create_folder   (Folder         *folder,
6038                                          FolderItem     *parent,
6039                                          const gchar    *name)
6040 {
6041         return NULL;
6042 }
6043 static gint     imap_rename_folder      (Folder         *folder,
6044                                          FolderItem     *item,
6045                                          const gchar    *name)
6046 {
6047         return -1;
6048 }
6049
6050 gchar imap_get_path_separator_for_item(FolderItem *item)
6051 {
6052         return '/';
6053 }
6054
6055 FolderClass *imap_get_class(void)
6056 {
6057         if (imap_class.idstr == NULL) {
6058                 imap_class.type = F_IMAP;
6059                 imap_class.idstr = "imap";
6060                 imap_class.uistr = "IMAP4";
6061
6062                 imap_class.new_folder = imap_folder_new;
6063                 imap_class.create_tree = imap_create_tree;
6064                 imap_class.create_folder = imap_create_folder;
6065                 imap_class.rename_folder = imap_rename_folder;
6066
6067                 imap_class.set_xml = folder_set_xml;
6068                 imap_class.get_xml = folder_get_xml;
6069                 imap_class.item_set_xml = imap_item_set_xml;
6070                 imap_class.item_get_xml = imap_item_get_xml;
6071                 /* nothing implemented */
6072         }
6073
6074         return &imap_class;
6075 }
6076
6077 void imap_disconnect_all(gboolean have_connectivity)
6078 {
6079 }
6080
6081 gint imap_subscribe(Folder *folder, FolderItem *item, gchar *rpath, gboolean sub)
6082 {
6083         return -1;
6084 }
6085
6086 GList * imap_scan_subtree(Folder *folder, FolderItem *item, gboolean unsubs_only, gboolean recursive)
6087 {
6088         return NULL;
6089 }
6090
6091 void imap_cache_msg(FolderItem *item, gint msgnum)
6092 {
6093 }
6094
6095 void imap_cancel_all(void)
6096 {
6097 }
6098
6099 gboolean imap_cancel_all_enabled(void)
6100 {
6101         return FALSE;
6102 }
6103
6104 #endif
6105
6106 #ifdef HAVE_LIBETPAN
6107 static void imap_synchronise(FolderItem *item, gint days)
6108 {
6109         if (IMAP_FOLDER_ITEM(item)->last_sync == IMAP_FOLDER_ITEM(item)->last_change) {
6110                 debug_print("%s already synced\n", item->path?item->path:item->name);
6111                 return;
6112         }
6113         debug_print("syncing %s\n", item->path?item->path:item->name);
6114         imap_gtk_synchronise(item, days);
6115         IMAP_FOLDER_ITEM(item)->last_sync = IMAP_FOLDER_ITEM(item)->last_change;
6116 }
6117 #endif
6118
6119 static void imap_item_set_xml(Folder *folder, FolderItem *item, XMLTag *tag)
6120 {
6121 #ifdef HAVE_LIBETPAN
6122         GList *cur;
6123 #endif
6124         folder_item_set_xml(folder, item, tag);
6125
6126 #ifdef HAVE_LIBETPAN
6127         for (cur = tag->attr; cur != NULL; cur = g_list_next(cur)) {
6128                 XMLAttr *attr = (XMLAttr *) cur->data;
6129
6130                 if (!attr || !attr->name || !attr->value) continue;
6131                 if (!strcmp(attr->name, "uidnext"))
6132                         IMAP_FOLDER_ITEM(item)->uid_next = atoi(attr->value);
6133                 if (!strcmp(attr->name, "last_sync"))
6134                         IMAP_FOLDER_ITEM(item)->last_sync = atoi(attr->value);
6135                 if (!strcmp(attr->name, "last_change"))
6136                         IMAP_FOLDER_ITEM(item)->last_change = atoi(attr->value);
6137         }
6138         if (IMAP_FOLDER_ITEM(item)->last_change == 0)
6139                 IMAP_FOLDER_ITEM(item)->last_change = time(NULL);
6140 #endif
6141 }
6142
6143 static XMLTag *imap_item_get_xml(Folder *folder, FolderItem *item)
6144 {
6145         XMLTag *tag;
6146
6147         tag = folder_item_get_xml(folder, item);
6148
6149 #ifdef HAVE_LIBETPAN
6150         xml_tag_add_attr(tag, xml_attr_new_int("uidnext",
6151                         IMAP_FOLDER_ITEM(item)->uid_next));
6152         xml_tag_add_attr(tag, xml_attr_new_int("last_sync",
6153                         IMAP_FOLDER_ITEM(item)->last_sync));
6154         xml_tag_add_attr(tag, xml_attr_new_int("last_change",
6155                         IMAP_FOLDER_ITEM(item)->last_change));
6156
6157 #endif
6158         return tag;
6159 }
6160
6161 /* ===================================================================
6162  * UTF-7 conversion routines as in RFC 2192
6163  * ===================================================================
6164  * These two functions from:
6165  * libimap library.
6166  * Copyright (C) 2003-2004 Pawel Salek. */
6167
6168 /* UTF7 modified base64 alphabet */
6169 static char base64chars[] =
6170   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
6171 #define UNDEFINED 64
6172
6173 /* UTF16 definitions */
6174 #define UTF16MASK       0x03FFUL
6175 #define UTF16SHIFT      10
6176 #define UTF16BASE       0x10000UL
6177 #define UTF16HIGHSTART  0xD800UL
6178 #define UTF16HIGHEND    0xDBFFUL
6179 #define UTF16LOSTART    0xDC00UL
6180 #define UTF16LOEND      0xDFFFUL
6181
6182
6183 /* Convert an IMAP mailbox to a UTF-8 string.
6184  *  dst needs to have roughly 4 times the storage space of src
6185  *    Hex encoding can triple the size of the input
6186  *    UTF-7 can be slightly denser than UTF-8
6187  *     (worst case: 8 octets UTF-7 becomes 9 octets UTF-8)
6188  */
6189 char* imap_modified_utf7_to_utf8(const char *mbox, gboolean change_spaces)
6190 {
6191   unsigned c, i, bitcount;
6192   unsigned long ucs4, utf16, bitbuf;
6193   unsigned char base64[256];
6194   const char *src;
6195   char *dst, *res  = g_malloc(2*strlen(mbox)+1);
6196
6197   dst = res;
6198   src = mbox;
6199   if(!dst) return NULL;
6200   /* initialize modified base64 decoding table */
6201   memset(base64, UNDEFINED, sizeof (base64));
6202   for (i = 0; i < sizeof (base64chars); ++i) {
6203     base64[(unsigned)base64chars[i]] = i;
6204   }
6205
6206   /* loop until end of string */
6207   while (*src != '\0') {
6208     c = *src++;
6209     /* deal with literal characters and &- */
6210     if (c != '&' || *src == '-') {
6211       /* encode literally */
6212       if (change_spaces && c == '_')
6213         *dst++ = ' ';
6214       else
6215         *dst++ = c;
6216       /* skip over the '-' if this is an &- sequence */
6217       if (c == '&') ++src;
6218     } else {
6219       /* convert modified UTF-7 -> UTF-16 -> UCS-4 -> UTF-8 -> HEX */
6220       bitbuf = 0;
6221       bitcount = 0;
6222       ucs4 = 0;
6223       while ((c = base64[(unsigned char) *src]) != UNDEFINED) {
6224         ++src;
6225         bitbuf = (bitbuf << 6) | c;
6226         bitcount += 6;
6227         /* enough bits for a UTF-16 character? */
6228         if (bitcount >= 16) {
6229           bitcount -= 16;
6230           utf16 = (bitcount ? bitbuf >> bitcount
6231                    : bitbuf) & 0xffff;
6232           /* convert UTF16 to UCS4 */
6233           if
6234             (utf16 >= UTF16HIGHSTART && utf16 <= UTF16HIGHEND) {
6235             ucs4 = (utf16 - UTF16HIGHSTART) << UTF16SHIFT;
6236             continue;
6237           } else if
6238             (utf16 >= UTF16LOSTART && utf16 <= UTF16LOEND) {
6239             ucs4 += utf16 - UTF16LOSTART + UTF16BASE;
6240           } else {
6241             ucs4 = utf16;
6242           }
6243
6244           /* convert UTF-16 range of UCS4 to UTF-8 */
6245           if (ucs4 <= 0x7fUL) {
6246             dst[0] = ucs4;
6247             dst += 1;
6248           } else if (ucs4 <= 0x7ffUL) {
6249             dst[0] = 0xc0 | (ucs4 >> 6);
6250             dst[1] = 0x80 | (ucs4 & 0x3f);
6251             dst += 2;
6252           } else if (ucs4 <= 0xffffUL) {
6253             dst[0] = 0xe0 | (ucs4 >> 12);
6254             dst[1] = 0x80 | ((ucs4 >> 6) & 0x3f);
6255             dst[2] = 0x80 | (ucs4 & 0x3f);
6256             dst += 3;
6257           } else {
6258             dst[0] = 0xf0 | (ucs4 >> 18);
6259             dst[1] = 0x80 | ((ucs4 >> 12) & 0x3f);
6260             dst[2] = 0x80 | ((ucs4 >> 6) & 0x3f);
6261             dst[3] = 0x80 | (ucs4 & 0x3f);
6262             dst += 4;
6263           }
6264         }
6265       }
6266       /* skip over trailing '-' in modified UTF-7 encoding */
6267       if (*src == '-') ++src;
6268     }
6269   }
6270   /* terminate destination string */
6271   *dst = '\0';
6272   return res;
6273 }
6274
6275 /* Convert hex coded UTF-8 string to modified UTF-7 IMAP mailbox
6276  *  dst should be about twice the length of src to deal with non-hex
6277  *  coded URLs
6278  */
6279 char* imap_utf8_to_modified_utf7(const char *src, gboolean change_spaces)
6280 {
6281   unsigned int utf8pos, utf8total, c, utf7mode, bitstogo, utf16flag;
6282   unsigned long ucs4 = 0, bitbuf = 0;
6283
6284   /* initialize hex lookup table */
6285   char *dst, *res;
6286
6287   if (!src) return NULL;
6288
6289   res = malloc(2*strlen(src)+1);
6290   dst = res;
6291   if(!dst) return NULL;
6292
6293   utf7mode = 0;
6294   utf8total = 0;
6295   bitstogo = 0;
6296   utf8pos = 0;
6297   while ((c = (unsigned char)*src) != '\0') {
6298     ++src;
6299     /* normal character? */
6300     if (c >= ' ' && c <= '~' && (c != '_' || !change_spaces)) {
6301       /* switch out of UTF-7 mode */
6302       if (utf7mode) {
6303         if (bitstogo) {
6304           *dst++ = base64chars[(bitbuf << (6 - bitstogo)) & 0x3F];
6305         }
6306         *dst++ = '-';
6307         utf7mode = 0;
6308         utf8pos  = 0;
6309         bitstogo = 0;
6310         utf8total= 0;
6311       }
6312       if (change_spaces && c == ' ')
6313         *dst++ = '_';
6314       else
6315         *dst++ = c;
6316       /* encode '&' as '&-' */
6317       if (c == '&') {
6318         *dst++ = '-';
6319       }
6320       continue;
6321     }
6322     /* switch to UTF-7 mode */
6323     if (!utf7mode) {
6324       *dst++ = '&';
6325       utf7mode = 1;
6326     }
6327     /* Encode US-ASCII characters as themselves */
6328     if (c < 0x80) {
6329       ucs4 = c;
6330     } else if (utf8total) {
6331       /* save UTF8 bits into UCS4 */
6332       ucs4 = (ucs4 << 6) | (c & 0x3FUL);
6333       if (++utf8pos < utf8total) {
6334         continue;
6335       }
6336     } else {
6337       utf8pos = 1;
6338       if (c < 0xE0) {
6339         utf8total = 2;
6340         ucs4 = c & 0x1F;
6341       } else if (c < 0xF0) {
6342         utf8total = 3;
6343         ucs4 = c & 0x0F;
6344       } else {
6345         /* NOTE: can't convert UTF8 sequences longer than 4 */
6346         utf8total = 4;
6347         ucs4 = c & 0x03;
6348       }
6349       continue;
6350     }
6351     /* loop to split ucs4 into two utf16 chars if necessary */
6352     utf8total = 0;
6353     do {
6354       if (ucs4 >= UTF16BASE) {
6355         ucs4 -= UTF16BASE;
6356         bitbuf = (bitbuf << 16) | ((ucs4 >> UTF16SHIFT)
6357                                    + UTF16HIGHSTART);
6358         ucs4 = (ucs4 & UTF16MASK) + UTF16LOSTART;
6359         utf16flag = 1;
6360       } else {
6361         bitbuf = (bitbuf << 16) | ucs4;
6362         utf16flag = 0;
6363       }
6364       bitstogo += 16;
6365       /* spew out base64 */
6366       while (bitstogo >= 6) {
6367         bitstogo -= 6;
6368         *dst++ = base64chars[(bitstogo ? (bitbuf >> bitstogo)
6369                               : bitbuf)
6370                              & 0x3F];
6371       }
6372     } while (utf16flag);
6373   }
6374   /* if in UTF-7 mode, finish in ASCII */
6375   if (utf7mode) {
6376     if (bitstogo) {
6377       *dst++ = base64chars[(bitbuf << (6 - bitstogo)) & 0x3F];
6378     }
6379     *dst++ = '-';
6380   }
6381   /* tie off string */
6382   *dst = '\0';
6383   return res;
6384 }