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