src/imap.c

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