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