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