src/imap.c

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