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 (LIBETPAN_VERSION_MAJOR > 0 || LIBETPAN_VERSION_MINOR > 48)
 684 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
 685         case MAILIMAP_ERROR_SSL:
 686                 log_warning(LOG_PROTOCOL, _("IMAP error: SSL error\n"));
 687                 break;
 688 #endif
 689 #endif
 690         default:
 691                 log_warning(LOG_PROTOCOL, _("IMAP error: Unknown error [%d]\n"),
 692                         libetpan_errcode);
 693                 break;
 694         }
 695
 696         if (session && is_fatal(libetpan_errcode)) {
 697                 imap_disc_session_destroy(IMAP_SESSION(session));
 698         } else if (session && !is_fatal(libetpan_errcode)) {
 699                 if (IMAP_SESSION(session)->busy)
 700                         unlock_session(IMAP_SESSION(session));
 701         }
 702 }
 703
 704 static Folder *imap_folder_new(const gchar *name, const gchar *path)
 705 {
 706         Folder *folder;
 707
 708         folder = (Folder *)g_new0(IMAPFolder, 1);
 709         folder->klass = &imap_class;
 710         imap_folder_init(folder, name, path);
 711
 712         return folder;
 713 }
 714
 715 static void imap_folder_destroy(Folder *folder)
 716 {
 717         while (imap_folder_get_refcnt(folder) > 0)
 718                 gtk_main_iteration();
 719
 720         folder_remote_folder_destroy(REMOTE_FOLDER(folder));
 721         imap_done(folder);
 722 }
 723
 724 static void imap_folder_init(Folder *folder, const gchar *name,
 725                              const gchar *path)
 726 {
 727         folder_remote_folder_init((Folder *)folder, name, path);
 728         IMAP_FOLDER(folder)->max_set_size = IMAP_SET_MAX_COUNT;
 729 }
 730
 731 static FolderItem *imap_folder_item_new(Folder *folder)
 732 {
 733         IMAPFolderItem *item;
 734
 735         item = g_new0(IMAPFolderItem, 1);
 736         item->lastuid = 0;
 737         item->uid_next = 0;
 738         item->uid_list = NULL;
 739
 740         return (FolderItem *)item;
 741 }
 742
 743 static void imap_folder_item_destroy(Folder *folder, FolderItem *_item)
 744 {
 745         IMAPFolderItem *item = (IMAPFolderItem *)_item;
 746
 747         g_return_if_fail(item != NULL);
 748         g_slist_free(item->uid_list);
 749
 750         g_free(_item);
 751 }
 752
 753 static gboolean imap_reset_uid_lists_func(GNode *node, gpointer data)
 754 {
 755         IMAPFolderItem *item = (IMAPFolderItem *)node->data;
 756
 757         item->lastuid = 0;
 758         g_slist_free(item->uid_list);
 759         item->uid_list = NULL;
 760
 761         return FALSE;
 762 }
 763
 764 static void imap_reset_uid_lists(Folder *folder)
 765 {
 766         if(folder->node == NULL)
 767                 return;
 768
 769         /* Destroy all uid lists and rest last uid */
 770         g_node_traverse(folder->node, G_IN_ORDER, G_TRAVERSE_ALL, -1, imap_reset_uid_lists_func, NULL);
 771 }
 772
 773 static int imap_get_capabilities(IMAPSession *session)
 774 {
 775         struct mailimap_capability_data *capabilities = NULL;
 776         clistiter *cur;
 777         int result = -1;
 778
 779         if (session->capability != NULL)
 780                 return MAILIMAP_NO_ERROR;
 781
 782         capabilities = imap_threaded_capability(session->folder, &result);
 783
 784         if (result != MAILIMAP_NO_ERROR) {
 785                 return result;
 786         }
 787
 788         if (capabilities == NULL) {
 789                 return MAILIMAP_NO_ERROR;
 790         }
 791
 792         for(cur = clist_begin(capabilities->cap_list) ; cur != NULL ;
 793             cur = clist_next(cur)) {
 794                 struct mailimap_capability * cap =
 795                         clist_content(cur);
 796                 if (!cap || cap->cap_data.cap_name == NULL)
 797                         continue;
 798                 session->capability = g_slist_append
 799                                 (session->capability,
 800                                  g_strdup(cap->cap_data.cap_name));
 801                 debug_print("got capa %s\n", cap->cap_data.cap_name);
 802         }
 803         mailimap_capability_data_free(capabilities);
 804         return MAILIMAP_NO_ERROR;
 805 }
 806
 807 static gboolean imap_has_capability(IMAPSession *session, const gchar *cap)
 808 {
 809         GSList *cur;
 810         for (cur = session->capability; cur; cur = cur->next) {
 811                 if (!g_ascii_strcasecmp(cur->data, cap))
 812                         return TRUE;
 813         }
 814         return FALSE;
 815 }
 816
 817 static gint imap_auth(IMAPSession *session, const gchar *user, const gchar *pass,
 818                       IMAPAuthType type)
 819 {
 820         gint ok = MAILIMAP_ERROR_LOGIN;
 821         static time_t last_login_err = 0;
 822         gchar *ext_info = "";
 823         int r;
 824         gchar *server = NULL;
 825         if ((r = imap_get_capabilities(session)) != MAILIMAP_NO_ERROR) {
 826                 imap_handle_error(SESSION(session), r);
 827                 return r;
 828         }
 829         server = g_strdup(SESSION(session)->server);
 830         switch(type) {
 831         case IMAP_AUTH_ANON:
 832                 ok = imap_cmd_login(session, user, pass, "ANONYMOUS");
 833                 break;
 834         case IMAP_AUTH_CRAM_MD5:
 835                 ok = imap_cmd_login(session, user, pass, "CRAM-MD5");
 836                 break;
 837         case IMAP_AUTH_DIGEST_MD5:
 838                 ok = imap_cmd_login(session, user, pass, "DIGEST-MD5");
 839                 break;
 840         case IMAP_AUTH_LOGIN:
 841                 ok = imap_cmd_login(session, user, pass, "LOGIN");
 842                 break;
 843         case IMAP_AUTH_GSSAPI:
 844                 ok = imap_cmd_login(session, user, pass, "GSSAPI");
 845                 break;
 846         default:
 847                 debug_print("capabilities:\n"
 848                                 "\t ANONYMOUS %d\n"
 849                                 "\t CRAM-MD5 %d\n"
 850                                 "\t DIGEST-MD5 %d\n"
 851                                 "\t LOGIN %d\n"
 852                                 "\t GSSAPI %d\n",
 853                         imap_has_capability(session, "ANONYMOUS"),
 854                         imap_has_capability(session, "CRAM-MD5"),
 855                         imap_has_capability(session, "DIGEST-MD5"),
 856                         imap_has_capability(session, "LOGIN"),
 857                         imap_has_capability(session, "GSSAPI"));
 858                 if (imap_has_capability(session, "CRAM-MD5"))
 859                         ok = imap_cmd_login(session, user, pass, "CRAM-MD5");
 860                 if (ok == MAILIMAP_ERROR_LOGIN && imap_has_capability(session, "DIGEST-MD5"))
 861                         ok = imap_cmd_login(session, user, pass, "DIGEST-MD5");
 862                 if (ok == MAILIMAP_ERROR_LOGIN && imap_has_capability(session, "GSSAPI"))
 863                         ok = imap_cmd_login(session, user, pass, "GSSAPI");
 864                 if (ok == MAILIMAP_ERROR_LOGIN) /* we always try LOGIN before giving up */
 865                         ok = imap_cmd_login(session, user, pass, "LOGIN");
 866         }
 867
 868         if (ok == MAILIMAP_NO_ERROR)
 869                 session->authenticated = TRUE;
 870         else {
 871                 if (type == IMAP_AUTH_CRAM_MD5) {
 872                         ext_info = _("\n\nCRAM-MD5 logins only work if libetpan has been "
 873                                      "compiled with SASL support and the "
 874                                      "CRAM-MD5 SASL plugin is installed.");
 875                 }
 876
 877                 if (type == IMAP_AUTH_DIGEST_MD5) {
 878                         ext_info = _("\n\nDIGEST-MD5 logins only work if libetpan has been "
 879                                      "compiled with SASL support and the "
 880                                      "DIGEST-MD5 SASL plugin is installed.");
 881                 }
 882
 883                 if (time(NULL) - last_login_err > 10) {
 884                         if (!prefs_common.no_recv_err_panel) {
 885                                 alertpanel_error_log(_("Connection to %s failed: "
 886                                         "login refused.%s"),
 887                                         server, ext_info);
 888                         } else {
 889                                 log_error(LOG_PROTOCOL, _("Connection to %s failed: "
 890                                         "login refused.%s\n"),
 891                                         server, ext_info);
 892                         }
 893                 }
 894                 last_login_err = time(NULL);
 895         }
 896         g_free(server);
 897         return ok;
 898 }
 899
 900 static IMAPSession *imap_reconnect_if_possible(Folder *folder, IMAPSession *session)
 901 {
 902         RemoteFolder *rfolder = REMOTE_FOLDER(folder);
 903         /* Check if this is the first try to establish a
 904            connection, if yes we don't try to reconnect */
 905         debug_print("reconnecting\n");
 906         if (rfolder->session == NULL) {
 907                 log_warning(LOG_PROTOCOL, _("Connecting to %s failed"),
 908                             folder->account->recv_server);
 909                 SESSION(session)->sock = NULL;
 910                 session_destroy(SESSION(session));
 911                 session = NULL;
 912         } else {
 913                 rfolder->session = NULL;
 914                 log_warning(LOG_PROTOCOL, _("IMAP4 connection to %s has been"
 915                             " disconnected. Reconnecting...\n"),
 916                             folder->account->recv_server);
 917                 statusbar_print_all(_("IMAP4 connection to %s has been"
 918                             " disconnected. Reconnecting...\n"),
 919                             folder->account->recv_server);
 920                 SESSION(session)->state = SESSION_DISCONNECTED;
 921                 SESSION(session)->sock = NULL;
 922                 session_destroy(SESSION(session));
 923                 /* Clear folders session to make imap_session_get create
 924                    a new session, because of rfolder->session == NULL
 925                    it will not try to reconnect again and so avoid an
 926                    endless loop */
 927                 debug_print("getting session...\n");
 928                 session = imap_session_get(folder);
 929                 rfolder->session = SESSION(session);
 930                 statusbar_pop_all();
 931         }
 932         return session;
 933 }
 934
 935 static IMAPSession *imap_session_get(Folder *folder)
 936 {
 937         RemoteFolder *rfolder = REMOTE_FOLDER(folder);
 938         IMAPSession *session = NULL;
 939         gint r = MAILIMAP_NO_ERROR;
 940
 941         g_return_val_if_fail(folder != NULL, NULL);
 942         g_return_val_if_fail(FOLDER_CLASS(folder) == &imap_class, NULL);
 943         g_return_val_if_fail(folder->account != NULL, NULL);
 944
 945         if (prefs_common.work_offline &&
 946             !inc_offline_should_override(FALSE,
 947                 _("Claws Mail needs network access in order "
 948                   "to access the IMAP server."))) {
 949                 return NULL;
 950         }
 951
 952         /* Make sure we have a session */
 953         if (rfolder->session != NULL && rfolder->session->state != SESSION_DISCONNECTED) {
 954                 session = IMAP_SESSION(rfolder->session);
 955         } else if (rfolder->session != NULL && rfolder->session->state == SESSION_DISCONNECTED) {
 956                 session_destroy(SESSION(rfolder->session));
 957                 rfolder->session = NULL;
 958                 goto new_conn;
 959         } else if (rfolder->connecting) {
 960                 debug_print("already connecting\n");
 961                 return NULL;
 962         } else {
 963 new_conn:
 964                 imap_reset_uid_lists(folder);
 965                 if (time(NULL) - rfolder->last_failure <= 2)
 966                         return NULL;
 967                 rfolder->connecting = TRUE;
 968                 session = imap_session_new(folder, folder->account);
 969         }
 970         if(session == NULL) {
 971                 rfolder->last_failure = time(NULL);
 972                 rfolder->connecting = FALSE;
 973                 return NULL;
 974         }
 975
 976         /* Make sure session is authenticated */
 977         if (!IMAP_SESSION(session)->authenticated)
 978                 r = imap_session_authenticate(IMAP_SESSION(session), folder->account);
 979
 980         if (r != MAILIMAP_NO_ERROR || (!is_fatal(r) && !IMAP_SESSION(session)->authenticated)) {
 981                 rfolder->session = NULL;
 982                 if (!is_fatal(r)) {
 983                         imap_threaded_disconnect(session->folder);
 984                         SESSION(session)->state = SESSION_DISCONNECTED;
 985                         SESSION(session)->sock = NULL;
 986                         session_destroy(SESSION(session));
 987                 }
 988                 rfolder->last_failure = time(NULL);
 989                 rfolder->connecting = FALSE;
 990                 return NULL;
 991         }
 992
 993         /* I think the point of this code is to avoid sending a
 994          * keepalive if we've used the session recently and therefore
 995          * think it's still alive.  Unfortunately, most of the code
 996          * does not yet check for errors on the socket, and so if the
 997          * connection drops we don't notice until the timeout expires.
 998          * A better solution than sending a NOOP every time would be
 999          * for every command to be prepared to retry until it is
1000          * successfully sent. -- mbp */
1001         if ((time(NULL) - SESSION(session)->last_access_time > SESSION_TIMEOUT_INTERVAL) || session->cancelled) {
1002                 /* verify that the session is still alive */
1003                 if ((r = imap_cmd_noop(session)) != MAILIMAP_NO_ERROR) {
1004                         debug_print("disconnected!\n");
1005                         if (!is_fatal(r))
1006                                 session = imap_reconnect_if_possible(folder, session);
1007                         else {
1008                                 rfolder->session = NULL;
1009                                 rfolder->connecting = FALSE;
1010                                 session = imap_session_get(folder);
1011                         }
1012                 }
1013                 if (session)
1014                         session->cancelled = FALSE;
1015         }
1016
1017         rfolder->session = SESSION(session);
1018         rfolder->connecting = FALSE;
1019
1020         return IMAP_SESSION(session);
1021 }
1022
1023 static IMAPSession *imap_session_new(Folder * folder,
1024                                      const PrefsAccount *account)
1025 {
1026         IMAPSession *session;
1027         gushort port;
1028         int r;
1029         int authenticated = FALSE;
1030
1031 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
1032         /* FIXME: IMAP over SSL only... */
1033         SSLType ssl_type;
1034
1035         port = account->set_imapport ? account->imapport
1036                 : account->ssl_imap == SSL_TUNNEL ? IMAPS_PORT : IMAP4_PORT;
1037         ssl_type = account->ssl_imap;
1038 #else
1039         if (account->ssl_imap != SSL_NONE) {
1040                 if (alertpanel_full(_("Insecure connection"),
1041                         _("This connection is configured to be secured "
1042                           "using SSL, but SSL is not available in this "
1043                           "build of Claws Mail. \n\n"
1044                           "Do you want to continue connecting to this "
1045                           "server? The communication would not be "
1046                           "secure."),
1047                           GTK_STOCK_CANCEL, _("Con_tinue connecting"),
1048                           NULL, FALSE, NULL, ALERT_WARNING,
1049                           G_ALERTDEFAULT) != G_ALERTALTERNATE)
1050                         return NULL;
1051         }
1052         port = account->set_imapport ? account->imapport
1053                 : IMAP4_PORT;
1054 #endif
1055
1056         imap_init(folder);
1057         statuswindow_print_all(_("Connecting to IMAP4 server: %s..."), folder->account->recv_server);
1058 #ifndef G_OS_WIN32
1059         if (account->set_tunnelcmd) {
1060                 r = imap_threaded_connect_cmd(folder,
1061                                               account->tunnelcmd,
1062                                               account->recv_server,
1063                                               port);
1064         }
1065         else
1066 #endif
1067         {
1068 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
1069                 if (ssl_type == SSL_TUNNEL) {
1070                         r = imap_threaded_connect_ssl(folder,
1071                                                       account->recv_server,
1072                                                       port);
1073                 }
1074                 else
1075 #endif
1076                 {
1077                         r = imap_threaded_connect(folder,
1078                                                   account->recv_server,
1079                                                   port);
1080                 }
1081         }
1082
1083         statuswindow_pop_all();
1084         if (r == MAILIMAP_NO_ERROR_AUTHENTICATED) {
1085                 authenticated = TRUE;
1086         }
1087         else if (r == MAILIMAP_NO_ERROR_NON_AUTHENTICATED) {
1088                 authenticated = FALSE;
1089         }
1090         else {
1091 #if (LIBETPAN_VERSION_MAJOR > 0 || LIBETPAN_VERSION_MINOR > 48)
1092 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
1093                 if (r == MAILIMAP_ERROR_SSL)
1094                         log_error(LOG_PROTOCOL, _("SSL handshake failed\n"));
1095                 else
1096 #endif
1097 #endif
1098                         imap_handle_error(NULL, r);
1099
1100                 if(!prefs_common.no_recv_err_panel) {
1101                         alertpanel_error_log(_("Can't connect to IMAP4 server: %s:%d"),
1102                                          account->recv_server, port);
1103                 } else {
1104                         log_error(LOG_PROTOCOL, _("Can't connect to IMAP4 server: %s:%d\n"),
1105                                          account->recv_server, port);
1106                 }
1107
1108                 return NULL;
1109         }
1110
1111         session = g_new0(IMAPSession, 1);
1112         session_init(SESSION(session));
1113         SESSION(session)->type             = SESSION_IMAP;
1114         SESSION(session)->server           = g_strdup(account->recv_server);
1115         SESSION(session)->port             = port;
1116         SESSION(session)->sock             = NULL;
1117
1118         SESSION(session)->destroy          = imap_session_destroy;
1119
1120         session->capability = NULL;
1121
1122         session->authenticated = authenticated;
1123         session->mbox = NULL;
1124         session->exists = 0;
1125         session->recent = 0;
1126         session->expunge = 0;
1127         session->cmd_count = 0;
1128         session->folder = folder;
1129         IMAP_FOLDER(session->folder)->last_seen_separator = 0;
1130
1131 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
1132         if (account->ssl_imap == SSL_STARTTLS) {
1133                 gint ok;
1134
1135                 ok = imap_cmd_starttls(session);
1136                 if (ok != MAILIMAP_NO_ERROR) {
1137                         log_warning(LOG_PROTOCOL, _("Can't start TLS session.\n"));
1138                         if (!is_fatal(ok)) {
1139                                 SESSION(session)->sock = NULL;
1140                                 session_destroy(SESSION(session));
1141                         }
1142                         return NULL;
1143                 }
1144
1145                 imap_free_capabilities(session);
1146                 session->authenticated = FALSE;
1147                 session->uidplus = FALSE;
1148                 session->cmd_count = 1;
1149         }
1150 #endif
1151         log_message(LOG_PROTOCOL, "IMAP connection is %s-authenticated\n",
1152                     (session->authenticated) ? "pre" : "un");
1153
1154         return session;
1155 }
1156
1157 static gint imap_session_authenticate(IMAPSession *session,
1158                                       const PrefsAccount *account)
1159 {
1160         gchar *pass, *acc_pass;
1161         gboolean failed = FALSE;
1162         gint ok = MAILIMAP_NO_ERROR;
1163         g_return_val_if_fail(account->userid != NULL, MAILIMAP_ERROR_BAD_STATE);
1164         acc_pass = account->passwd;
1165 try_again:
1166         pass = acc_pass;
1167         if (!pass && account->imap_auth_type != IMAP_AUTH_ANON) {
1168                 gchar *tmp_pass;
1169                 tmp_pass = input_dialog_query_password(account->recv_server, account->userid);
1170                 if (!tmp_pass)
1171                         return MAILIMAP_NO_ERROR;
1172                 Xstrdup_a(pass, tmp_pass, {g_free(tmp_pass); return MAILIMAP_NO_ERROR;});
1173                 g_free(tmp_pass);
1174         } else if (account->imap_auth_type == IMAP_AUTH_ANON) {
1175                 pass = "";
1176         }
1177         statuswindow_print_all(_("Connecting to IMAP4 server %s...\n"),
1178                                 account->recv_server);
1179         if ((ok = imap_auth(session, account->userid, pass, account->imap_auth_type)) != MAILIMAP_NO_ERROR) {
1180                 statusbar_pop_all();
1181
1182                 if (!failed && !is_fatal(ok)) {
1183                         acc_pass = NULL;
1184                         failed = TRUE;
1185                         goto try_again;
1186                 } else {
1187                         if (prefs_common.no_recv_err_panel) {
1188                                 log_error(LOG_PROTOCOL, _("Couldn't login to IMAP server %s.\n"), account->recv_server);
1189                                 mainwindow_show_error();
1190                         } else
1191                                 alertpanel_error_log(_("Couldn't login to IMAP server %s."), account->recv_server);
1192                 }
1193
1194                 return ok;
1195         }
1196
1197         statuswindow_pop_all();
1198         session->authenticated = TRUE;
1199         return MAILIMAP_NO_ERROR;
1200 }
1201
1202 static void imap_session_destroy(Session *session)
1203 {
1204         if (session->state != SESSION_DISCONNECTED)
1205                 imap_threaded_disconnect(IMAP_SESSION(session)->folder);
1206
1207         imap_free_capabilities(IMAP_SESSION(session));
1208         g_free(IMAP_SESSION(session)->mbox);
1209 }
1210
1211 static gchar *imap_fetch_msg(Folder *folder, FolderItem *item, gint uid)
1212 {
1213         return imap_fetch_msg_full(folder, item, uid, TRUE, TRUE);
1214 }
1215
1216 static guint get_file_size_with_crs(const gchar *filename)
1217 {
1218         FILE *fp = NULL;
1219         guint cnt = 0;
1220         gchar buf[4096];
1221
1222         if (filename == NULL)
1223                 return -1;
1224
1225         fp = fopen(filename, "rb");
1226         if (!fp)
1227                 return -1;
1228
1229         while (fgets(buf, sizeof (buf), fp) != NULL) {
1230                 cnt += strlen(buf);
1231                 if (!strstr(buf, "\r\n") && strstr(buf, "\n"))
1232                         cnt++;
1233         }
1234
1235         fclose(fp);
1236         return cnt;
1237 }
1238
1239 static void imap_remove_cached_msg(Folder *folder, FolderItem *item, MsgInfo *msginfo)
1240 {
1241         gchar *path, *filename;
1242
1243         path = folder_item_get_path(item);
1244
1245         if (!is_dir_exist(path)) {
1246                 g_free(path);
1247                 return;
1248         }
1249
1250         filename = g_strconcat(path, G_DIR_SEPARATOR_S, itos(msginfo->msgnum), NULL);
1251         g_free(path);
1252
1253         if (is_file_exist(filename)) {
1254                 claws_unlink(filename);
1255         }
1256         g_free(filename);
1257 }
1258
1259 typedef struct _TagsData {
1260         gchar *str;
1261         GSList *msglist;
1262         IMAPFolderItem *item;
1263 } TagsData;
1264
1265 static void imap_commit_tags(FolderItem *item, MsgInfo *msginfo, GSList *tags_set, GSList *tags_unset)
1266 {
1267         IMAPSession *session;
1268         gint ok, can_create_tags;
1269         Folder *folder = NULL;
1270         TagsData *ht_data = NULL;
1271         GSList *cur;
1272
1273         g_return_if_fail(item != NULL);
1274         g_return_if_fail(msginfo != NULL);
1275
1276         folder = item->folder;
1277         debug_print("getting session...\n");
1278         session = imap_session_get(folder);
1279
1280         if (!session) {
1281                 debug_print("can't get session\n");
1282                 return;
1283         }
1284
1285         ok = imap_select(session, IMAP_FOLDER(folder), item,
1286                          NULL, NULL, NULL, NULL, &can_create_tags, FALSE);
1287
1288         if (ok != MAILIMAP_NO_ERROR) {
1289                 return;
1290         }
1291
1292
1293         if (IMAP_FOLDER_ITEM(item)->can_create_flags != ITEM_CAN_CREATE_FLAGS)
1294                 return;
1295
1296         if (IMAP_FOLDER_ITEM(item)->batching) {
1297                 /* instead of performing an UID STORE command for each message change,
1298                  * as a lot of them can change "together", we just fill in hashtables
1299                  * and defer the treatment so that we're able to send only one
1300                  * command.
1301                  */
1302                 debug_print("IMAP batch mode on, deferring tags change\n");
1303                 for (cur = tags_set; cur; cur = cur->next) {
1304                         gint cur_tag = GPOINTER_TO_INT(cur->data);
1305                         if (cur_tag) {
1306                                 ht_data = g_hash_table_lookup(IMAP_FOLDER_ITEM(item)->tags_set_table,
1307                                         GINT_TO_POINTER(cur_tag));
1308                                 if (ht_data == NULL) {
1309                                         ht_data = g_new0(TagsData, 1);
1310                                         ht_data->str = g_strdup(tags_get_tag(cur_tag));
1311                                         ht_data->item = IMAP_FOLDER_ITEM(item);
1312                                         g_hash_table_insert(IMAP_FOLDER_ITEM(item)->tags_set_table,
1313                                                 GINT_TO_POINTER(cur_tag), ht_data);
1314                                 }
1315                                 ht_data->msglist = g_slist_prepend(ht_data->msglist, GINT_TO_POINTER(msginfo->msgnum));
1316                         }
1317                 }
1318                 for (cur = tags_unset; cur; cur = cur->next) {
1319                         gint cur_tag = GPOINTER_TO_INT(cur->data);
1320                         if (cur_tag) {
1321                                 ht_data = g_hash_table_lookup(IMAP_FOLDER_ITEM(item)->tags_unset_table,
1322                                         GINT_TO_POINTER(cur_tag));
1323                                 if (ht_data == NULL) {
1324                                         ht_data = g_new0(TagsData, 1);
1325                                         ht_data->str = g_strdup(tags_get_tag(cur_tag));
1326                                         ht_data->item = IMAP_FOLDER_ITEM(item);
1327                                         g_hash_table_insert(IMAP_FOLDER_ITEM(item)->tags_unset_table,
1328                                                 GINT_TO_POINTER(cur_tag), ht_data);
1329                                 }
1330                                 ht_data->msglist = g_slist_prepend(ht_data->msglist, GINT_TO_POINTER(msginfo->msgnum));
1331                         }
1332                 }
1333         } else {
1334                 GSList *list_set = NULL;
1335                 GSList *list_unset = NULL;
1336                 GSList numlist;
1337
1338                 numlist.data = GINT_TO_POINTER(msginfo->msgnum);
1339                 numlist.next = NULL;
1340
1341                 debug_print("IMAP changing tags NOW\n");
1342                 for (cur = tags_set; cur; cur = cur->next) {
1343                         gint cur_tag = GPOINTER_TO_INT(cur->data);
1344                         const gchar *str = tags_get_tag(cur_tag);
1345                         list_set = g_slist_prepend(list_set, g_strdup(str));
1346                 }
1347                 if (list_set) {
1348                         ok = imap_set_message_flags(session,
1349                                 IMAP_FOLDER_ITEM(item), &numlist, 0, list_set, TRUE);
1350                         slist_free_strings(list_set);
1351                         g_slist_free(list_set);
1352                         if (ok != MAILIMAP_NO_ERROR) {
1353                                 return;
1354                         }
1355                 }
1356
1357                 for (cur = tags_unset; cur; cur = cur->next) {
1358                         gint cur_tag = GPOINTER_TO_INT(cur->data);
1359                         const gchar *str = tags_get_tag(cur_tag);
1360                         list_unset = g_slist_prepend(list_unset, g_strdup(str));
1361                 }
1362                 if (list_unset) {
1363                         ok = imap_set_message_flags(session,
1364                                 IMAP_FOLDER_ITEM(item), &numlist, 0, list_unset, FALSE);
1365                         slist_free_strings(list_unset);
1366                         g_slist_free(list_unset);
1367                         if (ok != MAILIMAP_NO_ERROR) {
1368                                 return;
1369                         }
1370                 }
1371         }
1372 }
1373
1374 static gchar *imap_fetch_msg_full(Folder *folder, FolderItem *item, gint uid,
1375                                   gboolean headers, gboolean body)
1376 {
1377         gchar *path, *filename;
1378         IMAPSession *session;
1379         gint ok;
1380
1381         g_return_val_if_fail(folder != NULL, NULL);
1382         g_return_val_if_fail(item != NULL, NULL);
1383
1384         if (uid == 0)
1385                 return NULL;
1386
1387         path = folder_item_get_path(item);
1388         if (!is_dir_exist(path))
1389                 make_dir_hier(path);
1390         filename = g_strconcat(path, G_DIR_SEPARATOR_S, itos(uid), NULL);
1391         g_free(path);
1392         debug_print("trying to fetch cached %s\n", filename);
1393         if (is_file_exist(filename)) {
1394                 /* see whether the local file represents the whole message
1395                  * or not. As the IMAP server reports size with \r chars,
1396                  * we have to update the local file (UNIX \n only) size */
1397                 MsgInfo *cached = msgcache_get_msg(item->cache,uid);
1398                 guint have_size = -1;
1399
1400                 if (cached)
1401                         debug_print("message %d has been already %scached.\n", uid,
1402                                 MSG_IS_FULLY_CACHED(cached->flags) ? "fully ":"");
1403
1404                 if (!cached || !MSG_IS_FULLY_CACHED(cached->flags)) {
1405                         have_size = get_file_size_with_crs(filename);
1406                         if (cached && (cached->size <= have_size || !body)) {
1407                                 procmsg_msginfo_free(cached);
1408                                 ok = file_strip_crs(filename);
1409                                 if (ok == 0 && cached && cached->size <= have_size) {
1410                                         /* we have it all and stripped */
1411                                         debug_print("...fully cached in fact; setting flag.\n");
1412                                         procmsg_msginfo_set_flags(cached, MSG_FULLY_CACHED, 0);
1413                                 }
1414                                 return filename;
1415                         } else if (!cached && time(NULL) - get_file_mtime(filename) < 60) {
1416                                 debug_print("message not cached and file recent, considering file complete\n");
1417                                 ok = file_strip_crs(filename);
1418                                 if (ok == 0)
1419                                         return filename;
1420                         } else {
1421                                 procmsg_msginfo_free(cached);
1422                         }
1423                 }
1424                 if (cached && MSG_IS_FULLY_CACHED(cached->flags)) {
1425                         procmsg_msginfo_free(cached);
1426                         return filename;
1427                 }
1428         } else {
1429                 MsgInfo *cached = msgcache_get_msg(item->cache,uid);
1430                 if (cached) {
1431                         procmsg_msginfo_unset_flags(cached, MSG_FULLY_CACHED, 0);
1432                         procmsg_msginfo_free(cached);
1433                 }
1434         }
1435
1436         debug_print("getting session...\n");
1437         session = imap_session_get(folder);
1438
1439         if (!session) {
1440                 g_free(filename);
1441                 return NULL;
1442         }
1443         session_set_access_time(SESSION(session));
1444         lock_session(session); /* unlocked later in the function */
1445
1446         debug_print("IMAP fetching messages\n");
1447         ok = imap_select(session, IMAP_FOLDER(folder), item,
1448                          NULL, NULL, NULL, NULL, NULL, FALSE);
1449         if (ok != MAILIMAP_NO_ERROR) {
1450                 g_warning("can't select mailbox %s\n", item->path);
1451                 g_free(filename);
1452                 return NULL;
1453         }
1454
1455         session_set_access_time(SESSION(session));
1456
1457         debug_print("getting message %d...\n", uid);
1458         ok = imap_cmd_fetch(session, (guint32)uid, filename, headers, body);
1459
1460         if (ok != MAILIMAP_NO_ERROR) {
1461                 g_warning("can't fetch message %d\n", uid);
1462                 g_free(filename);
1463                 return NULL;
1464         }
1465
1466         session_set_access_time(SESSION(session));
1467         unlock_session(session);
1468
1469         ok = file_strip_crs(filename);
1470
1471         if (ok == 0 && headers && body) {
1472                 MsgInfo *cached = msgcache_get_msg(item->cache,uid);
1473                 if (cached) {
1474                         procmsg_msginfo_set_flags(cached, MSG_FULLY_CACHED, 0);
1475                         procmsg_msginfo_free(cached);
1476                 }
1477         } else if (ok == -1) {
1478                 MsgInfo *cached = msgcache_get_msg(item->cache,uid);
1479                 if (cached) {
1480                         procmsg_msginfo_unset_flags(cached, MSG_FULLY_CACHED, 0);
1481                         procmsg_msginfo_free(cached);
1482                 }
1483         }
1484         return filename;
1485 }
1486
1487 static gboolean imap_is_msg_fully_cached(Folder *folder, FolderItem *item, gint uid)
1488 {
1489         gchar *path, *filename;
1490         guint size = 0;
1491         MsgInfo *cached = msgcache_get_msg(item->cache,uid);
1492
1493         if (!cached)
1494                 return FALSE;
1495
1496         if (MSG_IS_FULLY_CACHED(cached->flags)) {
1497                 procmsg_msginfo_free(cached);
1498                 return TRUE;
1499         }
1500         path = folder_item_get_path(item);
1501         if (!is_dir_exist(path))
1502                 return FALSE;
1503
1504         filename = g_strconcat(path, G_DIR_SEPARATOR_S, itos(uid), NULL);
1505         g_free(path);
1506         if (is_file_exist(filename)) {
1507                 if (cached && cached->total_size == cached->size) {
1508                         /* fast path */
1509                         g_free(filename);
1510                         procmsg_msginfo_set_flags(cached, MSG_FULLY_CACHED, 0);
1511                         return TRUE;
1512                 }
1513                 size = get_file_size_with_crs(filename);
1514                 g_free(filename);
1515         }
1516         if (cached && size >= cached->size) {
1517                 cached->total_size = cached->size;
1518                 procmsg_msginfo_set_flags(cached, MSG_FULLY_CACHED, 0);
1519                 procmsg_msginfo_free(cached);
1520                 return TRUE;
1521         }
1522         if (cached)
1523                 procmsg_msginfo_free(cached);
1524         return FALSE;
1525 }
1526
1527 void imap_cache_msg(FolderItem *item, gint msgnum)
1528 {
1529         Folder *folder = NULL;
1530
1531         if (!item)
1532                 return;
1533         folder = item->folder;
1534
1535         if (!imap_is_msg_fully_cached(folder, item, msgnum)) {
1536                 gchar *tmp = imap_fetch_msg_full(folder, item, msgnum, TRUE, TRUE);
1537                 debug_print("fetched %s\n", tmp);
1538                 g_free(tmp);
1539         }
1540 }
1541
1542 static gint imap_add_msg(Folder *folder, FolderItem *dest,
1543                          const gchar *file, MsgFlags *flags)
1544 {
1545         gint ret;
1546         GSList file_list;
1547         MsgFileInfo fileinfo;
1548
1549         g_return_val_if_fail(file != NULL, -1);
1550
1551         fileinfo.msginfo = NULL;
1552         fileinfo.file = (gchar *)file;
1553         fileinfo.flags = flags;
1554         file_list.data = &fileinfo;
1555         file_list.next = NULL;
1556
1557         ret = imap_add_msgs(folder, dest, &file_list, NULL);
1558         return ret;
1559 }
1560
1561 static gint imap_add_msgs(Folder *folder, FolderItem *dest, GSList *file_list,
1562                    GRelation *relation)
1563 {
1564         gchar *destdir;
1565         IMAPSession *session;
1566         guint32 last_uid = 0;
1567         GSList *cur;
1568         MsgFileInfo *fileinfo;
1569         gint ok = MAILIMAP_NO_ERROR;
1570         gint curnum = 0, total = 0;
1571         gboolean missing_uids = FALSE;
1572
1573         g_return_val_if_fail(folder != NULL, -1);
1574         g_return_val_if_fail(dest != NULL, -1);
1575         g_return_val_if_fail(file_list != NULL, -1);
1576
1577         debug_print("getting session...\n");
1578         session = imap_session_get(folder);
1579         if (!session) {
1580                 return -1;
1581         }
1582         destdir = imap_get_real_path(session, IMAP_FOLDER(folder), dest->path, &ok);
1583         if (is_fatal(ok))
1584                 return -1;
1585         statusbar_print_all(_("Adding messages..."));
1586         total = g_slist_length(file_list);
1587         for (cur = file_list; cur != NULL; cur = cur->next) {
1588                 IMAPFlags iflags = 0;
1589                 guint32 new_uid = 0;
1590                 gchar *real_file = NULL;
1591                 fileinfo = (MsgFileInfo *)cur->data;
1592
1593                 statusbar_progress_all(curnum, total, total < 10 ? 1:10);
1594                 curnum++;
1595
1596                 if (fileinfo->flags) {
1597                         if (MSG_IS_MARKED(*fileinfo->flags))
1598                                 iflags |= IMAP_FLAG_FLAGGED;
1599                         if (MSG_IS_REPLIED(*fileinfo->flags))
1600                                 iflags |= IMAP_FLAG_ANSWERED;
1601                         if (MSG_IS_FORWARDED(*fileinfo->flags))
1602                                 iflags |= IMAP_FLAG_FORWARDED;
1603                         if (!MSG_IS_UNREAD(*fileinfo->flags))
1604                                 iflags |= IMAP_FLAG_SEEN;
1605
1606                 }
1607
1608                 if (real_file == NULL)
1609                         real_file = g_strdup(fileinfo->file);
1610
1611                 if (folder_has_parent_of_type(dest, F_QUEUE) ||
1612                     folder_has_parent_of_type(dest, F_OUTBOX) ||
1613                     folder_has_parent_of_type(dest, F_DRAFT) ||
1614                     folder_has_parent_of_type(dest, F_TRASH))
1615                         iflags |= IMAP_FLAG_SEEN;
1616
1617                 ok = imap_cmd_append(session, IMAP_FOLDER_ITEM(dest), destdir, real_file, iflags,
1618                                      &new_uid);
1619
1620                 if (ok != MAILIMAP_NO_ERROR) {
1621                         g_warning("can't append message %s\n", real_file);
1622                         g_free(real_file);
1623                         g_free(destdir);
1624                         statusbar_progress_all(0,0,0);
1625                         statusbar_pop_all();
1626                         return -1;
1627                 } else {
1628                         debug_print("appended new message as %d\n", new_uid);
1629                         /* put the local file in the imapcache, so that we don't
1630                          * have to fetch it back later. */
1631
1632                         if (new_uid == 0) {
1633                                 missing_uids = TRUE;
1634                                 debug_print("Missing UID (0)\n");
1635                         }
1636                         if (new_uid > 0) {
1637                                 gchar *cache_path = folder_item_get_path(dest);
1638                                 if (!is_dir_exist(cache_path))
1639                                         make_dir_hier(cache_path);
1640                                 if (is_dir_exist(cache_path)) {
1641                                         gchar *cache_file = g_strconcat(
1642                                                 cache_path, G_DIR_SEPARATOR_S,
1643                                                 itos(new_uid), NULL);
1644                                         copy_file(real_file, cache_file, TRUE);
1645                                         debug_print("got UID %d, copied to cache: %s\n", new_uid, cache_file);
1646                                         g_free(cache_file);
1647                                 }
1648                                 g_free(cache_path);
1649                         }
1650                 }
1651
1652                 if (relation != NULL)
1653                         g_relation_insert(relation, fileinfo->msginfo != NULL ?
1654                                           (gpointer) fileinfo->msginfo : (gpointer) fileinfo,
1655                                           GINT_TO_POINTER(new_uid));
1656                 if (last_uid < new_uid) {
1657                         last_uid = new_uid;
1658                 }
1659
1660                 g_free(real_file);
1661         }
1662
1663         statusbar_progress_all(0,0,0);
1664         statusbar_pop_all();
1665
1666
1667         g_free(destdir);
1668
1669         imap_scan_required(folder, dest);
1670
1671         session = imap_session_get(folder);
1672         if (!session) {
1673                 return -1;
1674         }
1675         if (missing_uids) {
1676                 gint a;
1677                 ok = imap_select(session, IMAP_FOLDER(folder), dest,
1678                          &a, NULL, NULL, NULL, NULL, FALSE);
1679         }
1680         return last_uid;
1681 }
1682
1683 static GSList *flatten_mailimap_set(struct mailimap_set * set)
1684 {
1685         GSList *result = NULL;
1686         clistiter *list;
1687         int start, end, t;
1688         GSList *cur;
1689
1690         for (list = clist_begin(set->set_list); list; list = clist_next(list)) {
1691                 struct mailimap_set_item *item = (struct mailimap_set_item *)clist_content(list);
1692                 start = item->set_first;
1693                 end = item->set_last;
1694                 for (t = start; t <= end; t++) {
1695                         result = g_slist_prepend(result, GINT_TO_POINTER(t));
1696                 }
1697         }
1698         result = g_slist_reverse(result);
1699         if (debug_get_mode()) {
1700                 debug_print("flat imap set: ");
1701                 for (cur = result; cur; cur = cur->next) {
1702                         debug_print("%d ", GPOINTER_TO_INT(cur->data));
1703                 }
1704                 debug_print("\n");
1705         }
1706
1707         return result;
1708 }
1709 static gint imap_do_copy_msgs(Folder *folder, FolderItem *dest,
1710                               MsgInfoList *msglist, GRelation *relation)
1711 {
1712         FolderItem *src;
1713         gchar *destdir;
1714         GSList *seq_list, *cur;
1715         MsgInfo *msginfo;
1716         IMAPSession *session;
1717         gint ok = MAILIMAP_NO_ERROR;
1718         GRelation *uid_mapping;
1719         gint last_num = 0;
1720         gboolean single = FALSE;
1721
1722         g_return_val_if_fail(folder != NULL, -1);
1723         g_return_val_if_fail(dest != NULL, -1);
1724         g_return_val_if_fail(msglist != NULL, -1);
1725
1726         debug_print("getting session...\n");
1727         session = imap_session_get(folder);
1728
1729         if (!session) {
1730                 return -1;
1731         }
1732
1733         msginfo = (MsgInfo *)msglist->data;
1734         if (msglist->next == NULL)
1735                 single = TRUE;
1736         src = msginfo->folder;
1737         if (src == dest) {
1738                 g_warning("the src folder is identical to the dest.\n");
1739                 return -1;
1740         }
1741
1742         if (src->folder != dest->folder) {
1743                 GSList *infolist = NULL, *cur;
1744                 int res = -1;
1745                 for (cur = msglist; cur; cur = cur->next) {
1746                         msginfo = (MsgInfo *)cur->data;
1747                         MsgFileInfo *fileinfo = g_new0(MsgFileInfo, 1);
1748                         fileinfo->file = procmsg_get_message_file(msginfo);
1749                         fileinfo->flags = &(msginfo->flags);
1750                         infolist = g_slist_prepend(infolist, fileinfo);
1751                 }
1752                 infolist = g_slist_reverse(infolist);
1753                 res = folder_item_add_msgs(dest, infolist, FALSE);
1754                 for (cur = infolist; cur; cur = cur->next) {
1755                         MsgFileInfo *info = (MsgFileInfo *)cur->data;
1756                         g_free(info->file);
1757                         g_free(info);
1758                 }
1759                 g_slist_free(infolist);
1760                 return res;
1761         }
1762
1763         lock_session(session); /* unlocked later in the function */
1764
1765         ok = imap_select(session, IMAP_FOLDER(folder), msginfo->folder,
1766                          NULL, NULL, NULL, NULL, NULL, FALSE);
1767         if (ok != MAILIMAP_NO_ERROR) {
1768                 return ok;
1769         }
1770
1771         unlock_session(session);
1772
1773         destdir = imap_get_real_path(session, IMAP_FOLDER(folder), dest->path, &ok);
1774
1775         if (is_fatal(ok))
1776                 return ok;
1777
1778         seq_list = imap_get_lep_set_from_msglist(IMAP_FOLDER(folder), msglist);
1779         uid_mapping = g_relation_new(2);
1780         g_relation_index(uid_mapping, 0, g_direct_hash, g_direct_equal);
1781
1782         statusbar_print_all(_("Copying messages..."));
1783         for (cur = seq_list; cur != NULL; cur = g_slist_next(cur)) {
1784                 struct mailimap_set * seq_set;
1785                 struct mailimap_set * source = NULL;
1786                 struct mailimap_set * dest = NULL;
1787                 seq_set = cur->data;
1788
1789                 debug_print("Copying messages from %s to %s ...\n",
1790                             src->path, destdir);
1791
1792                 lock_session(session); /* unlocked later in the function */
1793                 ok = imap_cmd_copy(session, seq_set, destdir, uid_mapping,
1794                         &source, &dest);
1795
1796                 if (is_fatal(ok)) {
1797                         session = NULL;
1798                 }
1799
1800                 if (ok == MAILIMAP_NO_ERROR) {
1801                         unlock_session(session);
1802                         if (relation && source && dest) {
1803                                 GSList *s_list = flatten_mailimap_set(source);
1804                                 GSList *d_list = flatten_mailimap_set(dest);
1805                                 GSList *s_cur, *d_cur;
1806                                 if (g_slist_length(s_list) == g_slist_length(d_list)) {
1807
1808                                         for (s_cur = s_list, d_cur = d_list;
1809                                              s_cur && d_cur;
1810                                              s_cur = s_cur->next, d_cur = d_cur->next) {
1811                                                 g_relation_insert(uid_mapping, s_cur->data, d_cur->data);
1812                                         }
1813
1814                                 } else {
1815                                         debug_print("hhhmm, source list length != dest list length.\n");
1816                                 }
1817                                 g_slist_free(s_list);
1818                                 g_slist_free(d_list);
1819                         }
1820                 }
1821
1822
1823                 if (source)
1824                         mailimap_set_free(source);
1825                 if (dest)
1826                         mailimap_set_free(dest);
1827
1828                 if (ok != MAILIMAP_NO_ERROR) {
1829                         g_relation_destroy(uid_mapping);
1830                         imap_lep_set_free(seq_list);
1831                         statusbar_pop_all();
1832                         return -1;
1833                 }
1834         }
1835
1836         for (cur = msglist; cur != NULL; cur = g_slist_next(cur)) {
1837                 MsgInfo *msginfo = (MsgInfo *)cur->data;
1838                 GTuples *tuples;
1839
1840                 tuples = g_relation_select(uid_mapping,
1841                                            GINT_TO_POINTER(msginfo->msgnum),
1842                                            0);
1843                 if (tuples->len > 0) {
1844                         gint num = GPOINTER_TO_INT(g_tuples_index(tuples, 0, 1));
1845                         g_relation_insert(relation, msginfo,
1846                                           GINT_TO_POINTER(num));
1847                         if (num > last_num)
1848                                 last_num = num;
1849                         debug_print("copied message %d as %d\n", msginfo->msgnum, num);
1850                         /* put the local file in the imapcache, so that we don't
1851                          * have to fetch it back later. */
1852                         if (num > 0) {
1853                                 gchar *cache_path = folder_item_get_path(msginfo->folder);
1854                                 gchar *real_file = g_strconcat(
1855                                         cache_path, G_DIR_SEPARATOR_S,
1856                                         itos(msginfo->msgnum), NULL);
1857                                 gchar *cache_file = NULL;
1858                                 g_free(cache_path);
1859                                 cache_path = folder_item_get_path(dest);
1860                                 cache_file = g_strconcat(
1861                                         cache_path, G_DIR_SEPARATOR_S,
1862                                         itos(num), NULL);
1863                                 if (!is_dir_exist(cache_path))
1864                                         make_dir_hier(cache_path);
1865                                 if (is_file_exist(real_file) && is_dir_exist(cache_path)) {
1866                                         copy_file(real_file, cache_file, TRUE);
1867                                         debug_print("copied to cache: %s\n", cache_file);
1868                                 }
1869                                 g_free(real_file);
1870                                 g_free(cache_file);
1871                                 g_free(cache_path);
1872                         }
1873                 } else
1874                         g_relation_insert(relation, msginfo,
1875                                           GINT_TO_POINTER(0));
1876                 g_tuples_destroy(tuples);
1877         }
1878         statusbar_pop_all();
1879
1880         g_relation_destroy(uid_mapping);
1881         imap_lep_set_free(seq_list);
1882
1883         g_free(destdir);
1884
1885         IMAP_FOLDER_ITEM(dest)->lastuid = 0;
1886         IMAP_FOLDER_ITEM(dest)->uid_next = 0;
1887         g_slist_free(IMAP_FOLDER_ITEM(dest)->uid_list);
1888         IMAP_FOLDER_ITEM(dest)->uid_list = NULL;
1889
1890         imap_scan_required(folder, dest);
1891         if (ok == MAILIMAP_NO_ERROR)
1892                 return last_num;
1893         else
1894                 return -1;
1895 }
1896
1897 static gint imap_copy_msg(Folder *folder, FolderItem *dest, MsgInfo *msginfo)
1898 {
1899         GSList msglist;
1900
1901         g_return_val_if_fail(msginfo != NULL, -1);
1902
1903         msglist.data = msginfo;
1904         msglist.next = NULL;
1905
1906         return imap_copy_msgs(folder, dest, &msglist, NULL);
1907 }
1908
1909 static gint imap_copy_msgs(Folder *folder, FolderItem *dest,
1910                     MsgInfoList *msglist, GRelation *relation)
1911 {
1912         MsgInfo *msginfo;
1913         gint ret;
1914
1915         g_return_val_if_fail(folder != NULL, -1);
1916         g_return_val_if_fail(dest != NULL, -1);
1917         g_return_val_if_fail(msglist != NULL, -1);
1918
1919         msginfo = (MsgInfo *)msglist->data;
1920         g_return_val_if_fail(msginfo->folder != NULL, -1);
1921
1922         ret = imap_do_copy_msgs(folder, dest, msglist, relation);
1923         return ret;
1924 }
1925
1926
1927 static gint imap_do_remove_msgs(Folder *folder, FolderItem *dest,
1928                                 MsgInfoList *msglist, GRelation *relation)
1929 {
1930         gchar *destdir, *dir;
1931         GSList *numlist = NULL, *cur;
1932         MsgInfo *msginfo;
1933         IMAPSession *session;
1934         gint ok = MAILIMAP_NO_ERROR;
1935         GRelation *uid_mapping;
1936
1937         g_return_val_if_fail(folder != NULL, -1);
1938         g_return_val_if_fail(dest != NULL, -1);
1939         g_return_val_if_fail(msglist != NULL, -1);
1940
1941         debug_print("getting session...\n");
1942         session = imap_session_get(folder);
1943         if (!session) {
1944                 return -1;
1945         }
1946
1947         lock_session(session); /* unlocked later in the function */
1948
1949         msginfo = (MsgInfo *)msglist->data;
1950
1951         ok = imap_select(session, IMAP_FOLDER(folder), msginfo->folder,
1952                          NULL, NULL, NULL, NULL, NULL, FALSE);
1953         if (ok != MAILIMAP_NO_ERROR) {
1954                 return ok;
1955         }
1956
1957         destdir = imap_get_real_path(session, IMAP_FOLDER(folder), dest->path, &ok);
1958         if (is_fatal(ok))
1959                 return ok;
1960         for (cur = msglist; cur; cur = cur->next) {
1961                 msginfo = (MsgInfo *)cur->data;
1962                 if (!MSG_IS_DELETED(msginfo->flags))
1963                         numlist = g_slist_prepend(numlist, GINT_TO_POINTER(msginfo->msgnum));
1964         }
1965         numlist = g_slist_reverse(numlist);
1966
1967         uid_mapping = g_relation_new(2);
1968         g_relation_index(uid_mapping, 0, g_direct_hash, g_direct_equal);
1969
1970         if (numlist != NULL) {
1971                 ok = imap_set_message_flags
1972                         (session, IMAP_FOLDER_ITEM(msginfo->folder), numlist, IMAP_FLAG_DELETED, NULL, TRUE);
1973                 if (ok != MAILIMAP_NO_ERROR) {
1974                         log_warning(LOG_PROTOCOL, _("can't set deleted flags\n"));
1975                         return ok;
1976                 }
1977         } /* else we just need to expunge */
1978         ok = imap_cmd_expunge(session);
1979         if (ok != MAILIMAP_NO_ERROR) {
1980                 log_warning(LOG_PROTOCOL, _("can't expunge\n"));
1981                 return ok;
1982         }
1983
1984         session->folder_content_changed = TRUE;
1985         unlock_session(session);
1986
1987         dir = folder_item_get_path(msginfo->folder);
1988         if (is_dir_exist(dir)) {
1989                 for (cur = msglist; cur; cur = cur->next) {
1990                         msginfo = (MsgInfo *)cur->data;
1991                         remove_numbered_files(dir, msginfo->msgnum, msginfo->msgnum);
1992                 }
1993         }
1994         g_free(dir);
1995
1996         g_relation_destroy(uid_mapping);
1997         g_slist_free(numlist);
1998
1999         imap_scan_required(folder, dest);
2000
2001         g_free(destdir);
2002         if (ok == MAILIMAP_NO_ERROR)
2003                 return 0;
2004         else
2005                 return -1;
2006 }
2007
2008 static gint imap_remove_msgs(Folder *folder, FolderItem *dest,
2009                     MsgInfoList *msglist, GRelation *relation)
2010 {
2011         MsgInfo *msginfo;
2012
2013         g_return_val_if_fail(folder != NULL, -1);
2014         g_return_val_if_fail(dest != NULL, -1);
2015         if (msglist == NULL)
2016                 return 0;
2017
2018         msginfo = (MsgInfo *)msglist->data;
2019         g_return_val_if_fail(msginfo->folder != NULL, -1);
2020
2021         return imap_do_remove_msgs(folder, dest, msglist, relation);
2022 }
2023
2024 static gint imap_remove_all_msg(Folder *folder, FolderItem *item)
2025 {
2026         GSList *list = folder_item_get_msg_list(item);
2027         gint res = imap_remove_msgs(folder, item, list, NULL);
2028         procmsg_msg_list_free(list);
2029         return res;
2030 }
2031
2032 static gboolean imap_is_msg_changed(Folder *folder, FolderItem *item,
2033                                     MsgInfo *msginfo)
2034 {
2035         /* TODO: properly implement this method */
2036         return FALSE;
2037 }
2038
2039 static gint imap_close(Folder *folder, FolderItem *item)
2040 {
2041         return 0;
2042 }
2043
2044 static gint imap_scan_tree_real(Folder *folder, gboolean subs_only)
2045 {
2046         FolderItem *item = NULL;
2047         IMAPSession *session;
2048         gchar *root_folder = NULL;
2049
2050         g_return_val_if_fail(folder != NULL, -1);
2051         g_return_val_if_fail(folder->account != NULL, -1);
2052
2053         debug_print("getting session...\n");
2054         session = imap_session_get(folder);
2055         if (!session) {
2056                 if (!folder->node) {
2057                         folder_tree_destroy(folder);
2058                         item = folder_item_new(folder, folder->name, NULL);
2059                         item->folder = folder;
2060                         folder->node = item->node = g_node_new(item);
2061                 }
2062                 return -1;
2063         }
2064
2065         if (folder->account->imap_dir && *folder->account->imap_dir) {
2066                 gchar *real_path;
2067                 int r;
2068                 clist * lep_list;
2069
2070                 Xstrdup_a(root_folder, folder->account->imap_dir, {return -1;});
2071                 extract_quote(root_folder, '"');
2072                 subst_char(root_folder,
2073                            imap_get_path_separator(session, IMAP_FOLDER(folder),
2074                                                    root_folder, &r),
2075                            '/');
2076                 if (is_fatal(r))
2077                         return -1;
2078                 strtailchomp(root_folder, '/');
2079                 real_path = imap_get_real_path
2080                         (session, IMAP_FOLDER(folder), root_folder, &r);
2081                 if (is_fatal(r))
2082                         return -1;
2083                 debug_print("IMAP root directory: %s\n", real_path);
2084
2085                 /* check if root directory exist */
2086
2087                 r = imap_threaded_list(session->folder, "", real_path,
2088                                        &lep_list);
2089
2090                 if (r != MAILIMAP_NO_ERROR)
2091                         imap_handle_error(SESSION(session), r);
2092
2093                 if ((r != MAILIMAP_NO_ERROR) || (clist_count(lep_list) == 0)) {
2094                         if (!folder->node) {
2095                                 item = folder_item_new(folder, folder->name, NULL);
2096                                 item->folder = folder;
2097                                 folder->node = item->node = g_node_new(item);
2098                         }
2099                         return -1;
2100                 }
2101                 mailimap_list_result_free(lep_list);
2102
2103                 g_free(real_path);
2104         }
2105
2106         if (folder->node)
2107                 item = FOLDER_ITEM(folder->node->data);
2108
2109         if (item && !item->path && root_folder) {
2110                 item->path = g_strdup(root_folder);
2111         }
2112
2113         if (!item || ((item->path || root_folder) &&
2114                       strcmp2(item->path, root_folder) != 0)) {
2115                 folder_tree_destroy(folder);
2116                 item = folder_item_new(folder, folder->name, root_folder);
2117                 item->folder = folder;
2118                 folder->node = item->node = g_node_new(item);
2119         }
2120
2121         imap_scan_tree_recursive(session, FOLDER_ITEM(folder->node->data), subs_only);
2122         imap_create_missing_folders(folder);
2123
2124         return 0;
2125 }
2126
2127 static gint imap_scan_tree(Folder *folder)
2128 {
2129         gboolean subs_only = FALSE;
2130         if (folder->account) {
2131                 debug_print(" scanning only subs %d\n", folder->account->imap_subsonly);
2132                 subs_only = folder->account->imap_subsonly;
2133         }
2134         return imap_scan_tree_real(folder, subs_only);
2135 }
2136
2137 static gint imap_scan_tree_recursive(IMAPSession *session, FolderItem *item, gboolean subs_only)
2138 {
2139         Folder *folder;
2140         IMAPFolder *imapfolder;
2141         FolderItem *new_item;
2142         GSList *item_list, *cur;
2143         GNode *node;
2144         gchar *real_path;
2145         gchar *wildcard_path;
2146         gchar separator;
2147         gchar wildcard[3];
2148         clist * lep_list;
2149         int r;
2150
2151         g_return_val_if_fail(item != NULL, -1);
2152         g_return_val_if_fail(item->folder != NULL, -1);
2153         g_return_val_if_fail(item->no_sub == FALSE, -1);
2154
2155         folder = item->folder;
2156         imapfolder = IMAP_FOLDER(folder);
2157
2158         separator = imap_get_path_separator(session, imapfolder, item->path, &r);
2159         if (is_fatal(r))
2160                 return r;
2161
2162         if (folder->ui_func)
2163                 folder->ui_func(folder, item, folder->ui_func_data);
2164
2165         if (item->path) {
2166                 wildcard[0] = separator;
2167                 wildcard[1] = '%';
2168                 wildcard[2] = '\0';
2169                 real_path = imap_get_real_path(session, imapfolder, item->path, &r);
2170                 if (is_fatal(r))
2171                         return r;
2172         } else {
2173                 wildcard[0] = '%';
2174                 wildcard[1] = '\0';
2175                 real_path = g_strdup("");
2176         }
2177
2178         Xstrcat_a(wildcard_path, real_path, wildcard,
2179                   {g_free(real_path); return MAILIMAP_ERROR_BAD_STATE;});
2180         lep_list = NULL;
2181
2182         if (subs_only)
2183                 r = imap_threaded_lsub(folder, "", wildcard_path, &lep_list);
2184         else
2185                 r = imap_threaded_list(folder, "", wildcard_path, &lep_list);
2186
2187         if (r != MAILIMAP_NO_ERROR) {
2188                 imap_handle_error(SESSION(session), r);
2189                 item_list = NULL;
2190                 return r;
2191         }
2192         else {
2193                 item_list = imap_list_from_lep(imapfolder,
2194                                                lep_list, real_path, FALSE);
2195                 mailimap_list_result_free(lep_list);
2196         }
2197
2198         g_free(real_path);
2199
2200         node = item->node->children;
2201         while (node != NULL) {
2202                 FolderItem *old_item = FOLDER_ITEM(node->data);
2203                 GNode *next = node->next;
2204
2205                 new_item = NULL;
2206                 for (cur = item_list; cur != NULL; cur = cur->next) {
2207                         FolderItem *cur_item = FOLDER_ITEM(cur->data);
2208                         if (!strcmp2(old_item->path, cur_item->path)) {
2209                                 new_item = cur_item;
2210                                 break;
2211                         }
2212                 }
2213                 if (!new_item) {
2214                         if (old_item && old_item->path && !strcmp(old_item->path, "INBOX")) {
2215                                 debug_print("not removing INBOX\n");
2216                         } else {
2217                                 debug_print("folder '%s' not found. removing...\n",
2218                                             old_item->path);
2219                                 folder_item_remove(old_item);
2220                         }
2221                 } else {
2222                         old_item->no_sub = new_item->no_sub;
2223                         old_item->no_select = new_item->no_select;
2224                         if (old_item->no_sub == TRUE && node->children) {
2225                                 debug_print("folder '%s' doesn't have "
2226                                             "subfolders. removing...\n",
2227                                             old_item->path);
2228                                 folder_item_remove_children(old_item);
2229                         }
2230                 }
2231
2232                 node = next;
2233         }
2234
2235         for (cur = item_list; cur != NULL; cur = cur->next) {
2236                 FolderItem *cur_item = FOLDER_ITEM(cur->data);
2237                 new_item = NULL;
2238
2239                 for (node = item->node->children; node != NULL;
2240                      node = node->next) {
2241                         if (!strcmp2(FOLDER_ITEM(node->data)->path,
2242                                      cur_item->path)) {
2243                                 new_item = FOLDER_ITEM(node->data);
2244                                 folder_item_destroy(cur_item);
2245                                 cur_item = NULL;
2246                                 break;
2247                         }
2248                 }
2249                 if (!new_item) {
2250                         new_item = cur_item;
2251                         debug_print("new folder '%s' found.\n", new_item->path);
2252                         folder_item_append(item, new_item);
2253                 }
2254
2255                 if (!strcmp(new_item->path, "INBOX")) {
2256                         new_item->stype = F_INBOX;
2257                         folder->inbox = new_item;
2258                 } else if (!folder_item_parent(item) || item->stype == F_INBOX) {
2259                         gchar *base;
2260
2261                         base = g_path_get_basename(new_item->path);
2262
2263                         if (!folder->outbox && !g_ascii_strcasecmp(base, "Sent")) {
2264                                 new_item->stype = F_OUTBOX;
2265                                 folder->outbox = new_item;
2266                         } else if (!folder->draft && !g_ascii_strcasecmp(base, "Drafts")) {
2267                                 new_item->stype = F_DRAFT;
2268                                 folder->draft = new_item;
2269                         } else if (!folder->queue && !g_ascii_strcasecmp(base, "Queue")) {
2270                                 new_item->stype = F_QUEUE;
2271                                 folder->queue = new_item;
2272                         } else if (!folder->trash && !g_ascii_strcasecmp(base, "Trash")) {
2273                                 new_item->stype = F_TRASH;
2274                                 folder->trash = new_item;
2275                         }
2276                         g_free(base);
2277                 }
2278
2279                 if (new_item->no_sub == FALSE)
2280                         imap_scan_tree_recursive(session, new_item, subs_only);
2281         }
2282
2283         g_slist_free(item_list);
2284
2285         return MAILIMAP_NO_ERROR;
2286 }
2287
2288 GList *imap_scan_subtree(Folder *folder, FolderItem *item, gboolean unsubs_only, gboolean recursive)
2289 {
2290         IMAPSession *session = imap_session_get(folder);
2291         gchar *real_path;
2292         gchar *wildcard_path;
2293         gchar separator;
2294         gchar wildcard[3];
2295         clist * lep_list;
2296         GSList *item_list = NULL, *cur;
2297         GList *child_list = NULL, *tmplist = NULL;
2298         GSList *sub_list = NULL;
2299         int r;
2300
2301         if (!session)
2302                 return NULL;
2303
2304         separator = imap_get_path_separator(session, IMAP_FOLDER(folder), item->path, &r);
2305         if (is_fatal(r))
2306                 return NULL;
2307
2308         if (item->path) {
2309                 wildcard[0] = separator;
2310                 wildcard[1] = '%';
2311                 wildcard[2] = '\0';
2312                 real_path = imap_get_real_path(session, IMAP_FOLDER(folder), item->path, &r);
2313                 if (is_fatal(r))
2314                         return NULL;
2315         } else {
2316                 wildcard[0] = '%';
2317                 wildcard[1] = '\0';
2318                 real_path = g_strdup("");
2319         }
2320
2321         Xstrcat_a(wildcard_path, real_path, wildcard,
2322                   {g_free(real_path); return NULL;});
2323         lep_list = NULL;
2324
2325         if (unsubs_only)
2326                 statusbar_print_all(_("Looking for unsubscribed folders in %s..."),
2327                                 item->path?item->path:item->name);
2328         else
2329                 statusbar_print_all(_("Looking for subfolders of %s..."),
2330                                 item->path?item->path:item->name);
2331
2332         r = imap_threaded_list(folder, "", wildcard_path, &lep_list);
2333         if (r) {
2334                 statusbar_pop_all();
2335                 return NULL;
2336         }
2337         item_list = imap_list_from_lep(IMAP_FOLDER(folder),
2338                                lep_list, real_path, FALSE);
2339         mailimap_list_result_free(lep_list);
2340
2341         for (cur = item_list; cur != NULL; cur = cur->next) {
2342                 FolderItem *cur_item = FOLDER_ITEM(cur->data);
2343                 if (recursive) {
2344                         tmplist = imap_scan_subtree(folder, cur_item,
2345                                         unsubs_only, recursive);
2346                         if (tmplist)
2347                                 child_list = g_list_concat(child_list, tmplist);
2348                 }
2349                 child_list = g_list_prepend(child_list,
2350                                 imap_get_real_path(session,
2351                                         IMAP_FOLDER(folder), cur_item->path, &r));
2352                 if (is_fatal(r)) {
2353                         statusbar_pop_all();
2354                         return NULL;
2355                 }
2356                 folder_item_destroy(cur_item);
2357         }
2358         child_list = g_list_reverse(child_list);
2359         g_slist_free(item_list);
2360
2361         if (unsubs_only) {
2362                 r = imap_threaded_lsub(folder, "", wildcard_path, &lep_list);
2363                 if (r) {
2364                         statusbar_pop_all();
2365                         return NULL;
2366                 }
2367                 sub_list = imap_list_from_lep(IMAP_FOLDER(folder),
2368                                        lep_list, real_path, FALSE);
2369                 mailimap_list_result_free(lep_list);
2370
2371                 for (cur = sub_list; cur != NULL; cur = cur->next) {
2372                         FolderItem *cur_item = FOLDER_ITEM(cur->data);
2373                         GList *oldlitem = NULL;
2374                         gchar *tmp = imap_get_real_path(session,
2375                                         IMAP_FOLDER(folder), cur_item->path, &r);
2376                         if (r) {
2377                                 statusbar_pop_all();
2378                                 return NULL;
2379                         }
2380                         folder_item_destroy(cur_item);
2381                         oldlitem = g_list_find_custom(
2382                                         child_list, tmp, (GCompareFunc)strcmp2);
2383                         if (oldlitem) {
2384                                 child_list = g_list_remove_link(child_list, oldlitem);
2385                                 g_free(oldlitem->data);
2386                                 g_list_free(oldlitem);
2387                         }
2388                         g_free(tmp);
2389                 }
2390         }
2391
2392         statusbar_pop_all();
2393
2394         return child_list;
2395 }
2396
2397 static gint imap_create_tree(Folder *folder)
2398 {
2399         g_return_val_if_fail(folder != NULL, -1);
2400         g_return_val_if_fail(folder->node != NULL, -1);
2401         g_return_val_if_fail(folder->node->data != NULL, -1);
2402         g_return_val_if_fail(folder->account != NULL, -1);
2403
2404         imap_scan_tree(folder);
2405         imap_create_missing_folders(folder);
2406
2407         return 0;
2408 }
2409
2410 static void imap_create_missing_folders(Folder *folder)
2411 {
2412         g_return_if_fail(folder != NULL);
2413
2414         if (!folder->inbox)
2415                 folder->inbox = imap_create_special_folder
2416                         (folder, F_INBOX, "INBOX");
2417         if (!folder->trash)
2418                 folder->trash = imap_create_special_folder
2419                         (folder, F_TRASH, "Trash");
2420         if (!folder->queue)
2421                 folder->queue = imap_create_special_folder
2422                         (folder, F_QUEUE, "Queue");
2423         if (!folder->outbox)
2424                 folder->outbox = imap_create_special_folder
2425                         (folder, F_OUTBOX, "Sent");
2426         if (!folder->draft)
2427                 folder->draft = imap_create_special_folder
2428                         (folder, F_DRAFT, "Drafts");
2429 }
2430
2431 static FolderItem *imap_create_special_folder(Folder *folder,
2432                                               SpecialFolderItemType stype,
2433                                               const gchar *name)
2434 {
2435         FolderItem *item;
2436         FolderItem *new_item;
2437
2438         g_return_val_if_fail(folder != NULL, NULL);
2439         g_return_val_if_fail(folder->node != NULL, NULL);
2440         g_return_val_if_fail(folder->node->data != NULL, NULL);
2441         g_return_val_if_fail(folder->account != NULL, NULL);
2442         g_return_val_if_fail(name != NULL, NULL);
2443
2444         item = FOLDER_ITEM(folder->node->data);
2445         new_item = imap_create_folder(folder, item, name);
2446
2447         if (!new_item) {
2448                 g_warning("Can't create '%s'\n", name);
2449                 if (!folder->inbox) return NULL;
2450
2451                 new_item = imap_create_folder(folder, folder->inbox, name);
2452                 if (!new_item)
2453                         g_warning("Can't create '%s' under INBOX\n", name);
2454                 else
2455                         new_item->stype = stype;
2456         } else
2457                 new_item->stype = stype;
2458
2459         return new_item;
2460 }
2461
2462 static gchar *imap_folder_get_path(Folder *folder)
2463 {
2464         gchar *folder_path;
2465
2466         g_return_val_if_fail(folder != NULL, NULL);
2467         g_return_val_if_fail(folder->account != NULL, NULL);
2468
2469         folder_path = g_strconcat(get_imap_cache_dir(),
2470                                   G_DIR_SEPARATOR_S,
2471                                   folder->account->recv_server,
2472                                   G_DIR_SEPARATOR_S,
2473                                   folder->account->userid,
2474                                   NULL);
2475
2476         return folder_path;
2477 }
2478
2479 static gchar *imap_item_get_path(Folder *folder, FolderItem *item)
2480 {
2481         gchar *folder_path, *path;
2482
2483         g_return_val_if_fail(folder != NULL, NULL);
2484         g_return_val_if_fail(item != NULL, NULL);
2485         folder_path = imap_folder_get_path(folder);
2486
2487         g_return_val_if_fail(folder_path != NULL, NULL);
2488         if (folder_path[0] == G_DIR_SEPARATOR) {
2489                 if (item->path)
2490                         path = g_strconcat(folder_path, G_DIR_SEPARATOR_S,
2491                                            item->path, NULL);
2492                 else
2493                         path = g_strdup(folder_path);
2494         } else {
2495                 if (item->path)
2496                         path = g_strconcat(get_home_dir(), G_DIR_SEPARATOR_S,
2497                                            folder_path, G_DIR_SEPARATOR_S,
2498                                            item->path, NULL);
2499                 else
2500                         path = g_strconcat(get_home_dir(), G_DIR_SEPARATOR_S,
2501                                            folder_path, NULL);
2502         }
2503         g_free(folder_path);
2504
2505         return path;
2506 }
2507
2508 static FolderItem *imap_create_folder(Folder *folder, FolderItem *parent,
2509                                const gchar *name)
2510 {
2511         gchar *dirpath, *imap_path;
2512         IMAPSession *session;
2513         FolderItem *new_item;
2514         gchar separator;
2515         gchar *new_name;
2516         const gchar *p;
2517         gint ok;
2518         gboolean no_select = FALSE, no_sub = FALSE;
2519         gboolean exist = FALSE;
2520
2521         g_return_val_if_fail(folder != NULL, NULL);
2522         g_return_val_if_fail(folder->account != NULL, NULL);
2523         g_return_val_if_fail(parent != NULL, NULL);
2524         g_return_val_if_fail(name != NULL, NULL);
2525
2526         debug_print("getting session...\n");
2527         session = imap_session_get(folder);
2528         if (!session) {
2529                 return NULL;
2530         }
2531
2532         if (!folder_item_parent(parent) && strcmp(name, "INBOX") == 0) {
2533                 dirpath = g_strdup(name);
2534         }else if (parent->path)
2535                 dirpath = g_strconcat(parent->path, "/", name, NULL);
2536         else if ((p = strchr(name, '/')) != NULL && *(p + 1) != '\0')
2537                 dirpath = g_strdup(name);
2538         else if (folder->account->imap_dir && *folder->account->imap_dir) {
2539                 gchar *imap_dir;
2540
2541                 Xstrdup_a(imap_dir, folder->account->imap_dir, {return NULL;});
2542                 strtailchomp(imap_dir, '/');
2543                 dirpath = g_strconcat(imap_dir, "/", name, NULL);
2544         } else
2545                 dirpath = g_strdup(name);
2546
2547
2548
2549         /* keep trailing directory separator to create a folder that contains
2550            sub folder */
2551         imap_path = imap_utf8_to_modified_utf7(dirpath, FALSE);
2552
2553         strtailchomp(dirpath, '/');
2554         Xstrdup_a(new_name, name, {
2555                 g_free(dirpath);
2556                 return NULL;});
2557
2558         separator = imap_get_path_separator(session, IMAP_FOLDER(folder), imap_path, &ok);
2559         if (is_fatal(ok))
2560                 return NULL;
2561         imap_path_separator_subst(imap_path, separator);
2562         /* remove trailing / for display */
2563         strtailchomp(new_name, '/');
2564
2565         if (strcmp(dirpath, "INBOX") != 0) {
2566                 GPtrArray *argbuf;
2567                 int r;
2568                 clist * lep_list;
2569
2570                 argbuf = g_ptr_array_new();
2571                 r = imap_threaded_list(folder, "", imap_path, &lep_list);
2572                 if (r != MAILIMAP_NO_ERROR) {
2573                         imap_handle_error(SESSION(session), r);
2574                         log_warning(LOG_PROTOCOL, _("can't create mailbox: LIST failed\n"));
2575                         g_free(imap_path);
2576                         g_free(dirpath);
2577                         ptr_array_free_strings(argbuf);
2578                         g_ptr_array_free(argbuf, TRUE);
2579                         return NULL;
2580                 }
2581
2582                 if (clist_count(lep_list) > 0)
2583                         exist = TRUE;
2584                 mailimap_list_result_free(lep_list);
2585                 lep_list = NULL;
2586                 if (!exist) {
2587                         ok = imap_cmd_create(session, imap_path);
2588                         if (ok != MAILIMAP_NO_ERROR) {
2589                                 log_warning(LOG_PROTOCOL, _("can't create mailbox\n"));
2590                                 g_free(imap_path);
2591                                 g_free(dirpath);
2592                                 return NULL;
2593                         }
2594                         r = imap_threaded_list(folder, "", imap_path, &lep_list);
2595                         if (r == MAILIMAP_NO_ERROR) {
2596                                 GSList *item_list = imap_list_from_lep(IMAP_FOLDER(folder),
2597                                                lep_list, dirpath, TRUE);
2598                                 if (item_list) {
2599                                         FolderItem *cur_item = FOLDER_ITEM(item_list->data);
2600                                         no_select = cur_item->no_select;
2601                                         no_sub = cur_item->no_sub;
2602                                         g_slist_free(item_list);
2603                                 }
2604                                 mailimap_list_result_free(lep_list);
2605                         } else {
2606                                 imap_handle_error(SESSION(session), r);
2607                         }
2608                 }
2609                 imap_threaded_subscribe(folder, imap_path, TRUE);
2610         } else {
2611                 clist *lep_list;
2612                 int r;
2613                 /* just get flags */
2614                 r = imap_threaded_list(folder, "", "INBOX", &lep_list);
2615                 if (r == MAILIMAP_NO_ERROR) {
2616                         GSList *item_list = imap_list_from_lep(IMAP_FOLDER(folder),
2617                                        lep_list, dirpath, TRUE);
2618                         if (item_list) {
2619                                 FolderItem *cur_item = FOLDER_ITEM(item_list->data);
2620                                 no_select = cur_item->no_select;
2621                                 no_sub = cur_item->no_sub;
2622                                 g_slist_free(item_list);
2623                         }
2624                         mailimap_list_result_free(lep_list);
2625                 } else {
2626                         imap_handle_error(SESSION(session), r);
2627                 }
2628         }
2629
2630         new_item = folder_item_new(folder, new_name, dirpath);
2631         new_item->no_select = no_select;
2632         new_item->no_sub = no_sub;
2633         folder_item_append(parent, new_item);
2634         g_free(imap_path);
2635         g_free(dirpath);
2636
2637         dirpath = folder_item_get_path(new_item);
2638         if (!is_dir_exist(dirpath))
2639                 make_dir_hier(dirpath);
2640         g_free(dirpath);
2641
2642         if (exist) {
2643                 /* folder existed, scan it */
2644                 imap_scan_required(folder, new_item);
2645                 folder_item_scan_full(new_item, FALSE);
2646         }
2647
2648         return new_item;
2649 }
2650
2651 static gint imap_rename_folder(Folder *folder, FolderItem *item,
2652                                const gchar *name)
2653 {
2654         gchar *dirpath;
2655         gchar *newpath;
2656         gchar *real_oldpath;
2657         gchar *real_newpath;
2658         gchar *paths[2];
2659         gchar *old_cache_dir;
2660         gchar *new_cache_dir;
2661         IMAPSession *session;
2662         gchar separator;
2663         gint ok;
2664         gint exists, recent, unseen;
2665         guint32 uid_validity;
2666
2667         g_return_val_if_fail(folder != NULL, -1);
2668         g_return_val_if_fail(item != NULL, -1);
2669         g_return_val_if_fail(item->path != NULL, -1);
2670         g_return_val_if_fail(name != NULL, -1);
2671
2672         debug_print("getting session...\n");
2673         session = imap_session_get(folder);
2674         if (!session) {
2675                 return -1;
2676         }
2677
2678         if (strchr(name, imap_get_path_separator(session, IMAP_FOLDER(folder), item->path, &ok)) != NULL ||
2679                 is_fatal(ok)) {
2680                 g_warning(_("New folder name must not contain the namespace "
2681                             "path separator"));
2682                 return -1;
2683         }
2684
2685         real_oldpath = imap_get_real_path(session, IMAP_FOLDER(folder), item->path, &ok);
2686         if (is_fatal(ok)) {
2687                 return -1;
2688         }
2689
2690         g_free(session->mbox);
2691         session->mbox = NULL;
2692         session->exists = 0;
2693         session->recent = 0;
2694         session->expunge = 0;
2695         ok = imap_cmd_examine(session, "INBOX",
2696                               &exists, &recent, &unseen, &uid_validity, FALSE);
2697         if (ok != MAILIMAP_NO_ERROR) {
2698                 g_free(real_oldpath);
2699                 return -1;
2700         }
2701
2702         separator = imap_get_path_separator(session, IMAP_FOLDER(folder), item->path, &ok);
2703         if (is_fatal(ok))
2704                 return -1;
2705         if (strchr(item->path, G_DIR_SEPARATOR)) {
2706                 dirpath = g_path_get_dirname(item->path);
2707                 newpath = g_strconcat(dirpath, G_DIR_SEPARATOR_S, name, NULL);
2708                 g_free(dirpath);
2709         } else
2710                 newpath = g_strdup(name);
2711
2712         real_newpath = imap_utf8_to_modified_utf7(newpath, FALSE);
2713         imap_path_separator_subst(real_newpath, separator);
2714
2715         ok = imap_cmd_rename(session, real_oldpath, real_newpath);
2716         if (ok != MAILIMAP_NO_ERROR) {
2717                 log_warning(LOG_PROTOCOL, _("can't rename mailbox: %s to %s\n"),
2718                             real_oldpath, real_newpath);
2719                 g_free(real_oldpath);
2720                 g_free(newpath);
2721                 g_free(real_newpath);
2722                 return -1;
2723         }
2724         g_free(item->name);
2725         item->name = g_strdup(name);
2726
2727         old_cache_dir = folder_item_get_path(item);
2728
2729         paths[0] = g_strdup(item->path);
2730         paths[1] = newpath;
2731         g_node_traverse(item->node, G_PRE_ORDER, G_TRAVERSE_ALL, -1,
2732                         imap_rename_folder_func, paths);
2733
2734         if (is_dir_exist(old_cache_dir)) {
2735                 new_cache_dir = folder_item_get_path(item);
2736                 if (rename(old_cache_dir, new_cache_dir) < 0) {
2737                         FILE_OP_ERROR(old_cache_dir, "rename");
2738                 }
2739                 g_free(new_cache_dir);
2740         }
2741
2742         g_free(old_cache_dir);
2743         g_free(paths[0]);
2744         g_free(newpath);
2745         g_free(real_oldpath);
2746         g_free(real_newpath);
2747         return 0;
2748 }
2749
2750 gint imap_subscribe(Folder *folder, FolderItem *item, gchar *rpath, gboolean sub)
2751 {
2752         gchar *path;
2753         gint r = -1;
2754         IMAPSession *session;
2755         debug_print("getting session...\n");
2756
2757         session = imap_session_get(folder);
2758         if (!session) {
2759                 return -1;
2760         }
2761         if (item && item->path) {
2762                 path = imap_get_real_path(session, IMAP_FOLDER(folder), item->path, &r);
2763                 if (!path || is_fatal(r))
2764                         return -1;
2765                 if (!strcmp(path, "INBOX") && sub == FALSE)
2766                         return -1;
2767                 debug_print("%ssubscribing %s\n", sub?"":"un", path);
2768                 r = imap_threaded_subscribe(folder, path, sub);
2769                 g_free(path);
2770         } else if (rpath) {
2771                 r = imap_threaded_subscribe(folder, rpath, sub);
2772         } else
2773                 return -1;
2774         return r;
2775 }
2776
2777 static gint imap_remove_folder_real(Folder *folder, FolderItem *item)
2778 {
2779         gint ok;
2780         IMAPSession *session;
2781         gchar *path;
2782         gchar *cache_dir;
2783         gboolean selected_folder;
2784
2785         g_return_val_if_fail(folder != NULL, -1);
2786         g_return_val_if_fail(item != NULL, -1);
2787         g_return_val_if_fail(item->path != NULL, -1);
2788
2789         debug_print("getting session...\n");
2790         session = imap_session_get(folder);
2791         if (!session) {
2792                 return -1;
2793         }
2794         path = imap_get_real_path(session, IMAP_FOLDER(folder), item->path, &ok);
2795         if (is_fatal(ok))
2796                 return -1;
2797
2798         imap_threaded_subscribe(folder, path, FALSE);
2799
2800         selected_folder = (session->mbox != NULL) &&
2801                           (!strcmp(session->mbox, item->path));
2802         if (selected_folder) {
2803                 ok = imap_cmd_close(session);
2804                 if (ok != MAILIMAP_NO_ERROR) {
2805                         debug_print("close err %d\n", ok);
2806                         return ok;
2807                 }
2808         }
2809         ok = imap_cmd_delete(session, path);
2810         if (ok != MAILIMAP_NO_ERROR && !is_fatal(ok)) {
2811                 gchar *tmp = g_strdup_printf("%s%c", path,
2812                                 imap_get_path_separator(session, IMAP_FOLDER(folder), path, &ok));
2813                 g_free(path);
2814                 path = tmp;
2815                 if (!is_fatal(ok))
2816                         ok = imap_cmd_delete(session, path);
2817         }
2818
2819         if (ok != MAILIMAP_NO_ERROR) {
2820                 log_warning(LOG_PROTOCOL, _("can't delete mailbox\n"));
2821                 g_free(path);
2822                 return -1;
2823         }
2824
2825         g_free(path);
2826         cache_dir = folder_item_get_path(item);
2827         if (is_dir_exist(cache_dir) && remove_dir_recursive(cache_dir) < 0)
2828                 g_warning("can't remove directory '%s'\n", cache_dir);
2829         g_free(cache_dir);
2830         folder_item_remove(item);
2831         return 0;
2832 }
2833
2834 static gint imap_remove_folder(Folder *folder, FolderItem *item)
2835 {
2836         GNode *node, *next;
2837
2838         g_return_val_if_fail(item != NULL, -1);
2839         g_return_val_if_fail(item->folder != NULL, -1);
2840         g_return_val_if_fail(item->node != NULL, -1);
2841
2842         node = item->node->children;
2843         while (node != NULL) {
2844                 next = node->next;
2845                 if (imap_remove_folder(folder, FOLDER_ITEM(node->data)) < 0)
2846                         return -1;
2847                 node = next;
2848         }
2849         debug_print("IMAP removing %s\n", item->path);
2850
2851         if (imap_remove_all_msg(folder, item) < 0)
2852                 return -1;
2853         return imap_remove_folder_real(folder, item);
2854 }
2855
2856 typedef struct _uncached_data {
2857         IMAPSession *session;
2858         FolderItem *item;
2859         MsgNumberList *numlist;
2860         guint cur;
2861         guint total;
2862         gboolean done;
2863         int ok;
2864 } uncached_data;
2865
2866 static void *imap_get_uncached_messages_thread(void *data)
2867 {
2868         uncached_data *stuff = (uncached_data *)data;
2869         IMAPSession *session = stuff->session;
2870         FolderItem *item = stuff->item;
2871         MsgNumberList *numlist = stuff->numlist;
2872         GSList *newlist = NULL;
2873         GSList *llast = NULL;
2874         GSList *seq_list, *cur;
2875         gboolean got_alien_tags = FALSE;
2876
2877         debug_print("uncached_messages\n");
2878
2879         if (session == NULL || item == NULL || item->folder == NULL
2880             || FOLDER_CLASS(item->folder) != &imap_class) {
2881                 stuff->done = TRUE;
2882                 return NULL;
2883         }
2884
2885         seq_list = imap_get_lep_set_from_numlist(IMAP_FOLDER(item->folder), numlist);
2886         debug_print("get msgs info\n");
2887         for (cur = seq_list; cur != NULL; cur = g_slist_next(cur)) {
2888                 struct mailimap_set * imapset;
2889                 unsigned int i;
2890                 int r;
2891                 carray * env_list;
2892                 int count;
2893
2894                 if (session->cancelled)
2895                         break;
2896
2897                 imapset = cur->data;
2898
2899                 r = imap_threaded_fetch_env(session->folder,
2900                                             imapset, &env_list);
2901                 if (r != MAILIMAP_NO_ERROR) {
2902                         imap_handle_error(SESSION(session), r);
2903                         if (is_fatal(r)) {
2904                                 stuff->ok = r;
2905                                 return NULL;
2906                         }
2907                         continue;
2908                 }
2909
2910                 session_set_access_time(SESSION(session));
2911
2912                 count = 0;
2913                 for(i = 0 ; i < carray_count(env_list) ; i += 2) {
2914                         struct imap_fetch_env_info * info;
2915                         MsgInfo * msginfo;
2916                         GSList *tags = NULL, *cur = NULL;
2917                         info = carray_get(env_list, i);
2918                         tags = carray_get(env_list, i+1);
2919                         msginfo = imap_envelope_from_lep(info, item);
2920                         if (msginfo == NULL) {
2921                                 slist_free_strings(tags);
2922                                 g_slist_free(tags);
2923                                 continue;
2924                         }
2925                         if (tags != NULL) {
2926                                 g_slist_free(msginfo->tags);
2927                                 msginfo->tags = NULL;
2928                         }
2929                         for (cur = tags; cur; cur = cur->next) {
2930                                 gchar *real_tag = imap_modified_utf7_to_utf8(cur->data, TRUE);
2931                                 gint id = 0;
2932                                 id = tags_get_id_for_str(real_tag);
2933                                 if (id == -1) {
2934                                         id = tags_add_tag(real_tag);
2935                                         got_alien_tags = TRUE;
2936                                 }
2937                                 if (!g_slist_find(msginfo->tags, GINT_TO_POINTER(id))) {
2938                                         msginfo->tags = g_slist_append(
2939                                                         msginfo->tags,
2940                                                         GINT_TO_POINTER(id));
2941                                 }
2942                                 g_free(real_tag);
2943                         }
2944                         slist_free_strings(tags);
2945                         g_slist_free(tags);
2946                         msginfo->folder = item;
2947                         if (!newlist)
2948                                 llast = newlist = g_slist_append(newlist, msginfo);
2949                         else {
2950                                 llast = g_slist_append(llast, msginfo);
2951                                 llast = llast->next;
2952                         }
2953                         count ++;
2954                 }
2955
2956                 imap_fetch_env_free(env_list);
2957         }
2958
2959         if (got_alien_tags) {
2960                 tags_write_tags();
2961                 main_window_reflect_tags_changes(mainwindow_get_mainwindow());
2962         }
2963
2964         for (cur = seq_list; cur != NULL; cur = g_slist_next(cur)) {
2965                 struct mailimap_set * imapset;
2966
2967                 imapset = cur->data;
2968                 mailimap_set_free(imapset);
2969         }
2970
2971         session_set_access_time(SESSION(session));
2972         stuff->done = TRUE;
2973         return newlist;
2974 }
2975
2976 #define MAX_MSG_NUM 50
2977
2978 static GSList *imap_get_uncached_messages(IMAPSession *session,
2979                                         FolderItem *item,
2980                                         MsgNumberList *numlist,
2981                                         int *r)
2982 {
2983         GSList *result = NULL;
2984         GSList * cur;
2985         uncached_data *data = g_new0(uncached_data, 1);
2986         int finished;
2987
2988         finished = 0;
2989         cur = numlist;
2990         data->total = g_slist_length(numlist);
2991         data->ok = MAILIMAP_NO_ERROR;
2992         debug_print("messages list : %i\n", data->total);
2993
2994         while (cur != NULL) {
2995                 GSList * partial_result;
2996                 int count;
2997                 GSList * newlist;
2998                 GSList * llast;
2999
3000                 llast = NULL;
3001                 count = 0;
3002                 newlist = NULL;
3003                 while (count < MAX_MSG_NUM) {
3004                         void * p;
3005
3006                         p = cur->data;
3007
3008                         if (newlist == NULL)
3009                                 llast = newlist = g_slist_append(newlist, p);
3010                         else {
3011                                 llast = g_slist_append(llast, p);
3012                                 llast = llast->next;
3013                         }
3014                         count ++;
3015
3016                         cur = cur->next;
3017                         if (cur == NULL)
3018                                 break;
3019                 }
3020
3021                 data->done = FALSE;
3022                 data->session = session;
3023                 data->item = item;
3024                 data->numlist = newlist;
3025                 data->cur += count;
3026
3027                 if (prefs_common.work_offline &&
3028                     !inc_offline_should_override(FALSE,
3029                         _("Claws Mail needs network access in order "
3030                           "to access the IMAP server."))) {
3031                         g_free(data);
3032                         return NULL;
3033                 }
3034
3035                 partial_result =
3036                         (GSList *)imap_get_uncached_messages_thread(data);
3037                 *r = data->ok;
3038                 if (data->ok != MAILIMAP_NO_ERROR) {
3039                         goto bail;
3040                 }
3041                 statusbar_progress_all(data->cur,data->total, 1);
3042
3043                 g_slist_free(newlist);
3044
3045                 result = g_slist_concat(result, partial_result);
3046         }
3047 bail:
3048         g_free(data);
3049
3050         statusbar_progress_all(0,0,0);
3051         statusbar_pop_all();
3052
3053         return result;
3054 }
3055
3056 static void imap_delete_all_cached_messages(FolderItem *item)
3057 {
3058         gchar *dir;
3059
3060         g_return_if_fail(item != NULL);
3061         g_return_if_fail(item->folder != NULL);
3062         g_return_if_fail(FOLDER_CLASS(item->folder) == &imap_class);
3063
3064         debug_print("Deleting all cached messages...\n");
3065
3066         dir = folder_item_get_path(item);
3067         if (is_dir_exist(dir))
3068                 remove_all_numbered_files(dir);
3069         g_free(dir);
3070
3071         debug_print("done.\n");
3072 }
3073
3074 gchar imap_get_path_separator_for_item(FolderItem *item)
3075 {
3076         Folder *folder = NULL;
3077         IMAPFolder *imap_folder = NULL;
3078         IMAPSession *session = NULL;
3079         gchar result = '/';
3080         gint ok;
3081         if (!item)
3082                 return '/';
3083         folder = item->folder;
3084
3085         if (!folder)
3086                 return '/';
3087
3088         imap_folder = IMAP_FOLDER(folder);
3089
3090         if (!imap_folder)
3091                 return '/';
3092
3093         debug_print("getting session...");
3094         session = imap_session_get(FOLDER(folder));
3095         result = imap_get_path_separator(session, imap_folder, item->path, &ok);
3096         return result;
3097 }
3098
3099 static gchar imap_refresh_path_separator(IMAPSession *session, IMAPFolder *folder, const gchar *subfolder, gint *ok)
3100 {
3101         clist * lep_list;
3102         int r;
3103         gchar separator = '\0';
3104
3105         g_return_val_if_fail(session != NULL, '/');
3106         r = imap_threaded_list((Folder *)folder, "", subfolder, &lep_list);
3107
3108         if (r != MAILIMAP_NO_ERROR) {
3109                 imap_handle_error(SESSION(session), r);
3110                 log_warning(LOG_PROTOCOL, _("LIST failed\n"));
3111                 *ok = r;
3112                 return '\0';
3113         }
3114
3115         if (clist_count(lep_list) > 0) {
3116                 clistiter * iter = clist_begin(lep_list);
3117                 struct mailimap_mailbox_list * mb;
3118                 mb = clist_content(iter);
3119
3120                 separator = mb->mb_delimiter;
3121                 debug_print("got separator: %c\n", folder->last_seen_separator);
3122         }
3123         *ok = MAILIMAP_NO_ERROR;
3124         mailimap_list_result_free(lep_list);
3125         return separator;
3126 }
3127
3128 static gchar imap_get_path_separator(IMAPSession *session, IMAPFolder *folder, const gchar *path, gint *ok)
3129 {
3130         gchar separator = '/';
3131
3132         if (folder->last_seen_separator == 0) {
3133                 folder->last_seen_separator = imap_refresh_path_separator(session, folder, "", ok);
3134         }
3135
3136         if (folder->last_seen_separator == 0) {
3137                 folder->last_seen_separator = imap_refresh_path_separator(session, folder, "INBOX", ok);
3138         }
3139
3140         if (folder->last_seen_separator != 0) {
3141                 debug_print("using separator: %c\n", folder->last_seen_separator);
3142                 return folder->last_seen_separator;
3143         }
3144
3145         return separator;
3146 }
3147
3148 static gchar *imap_get_real_path(IMAPSession *session, IMAPFolder *folder, const gchar *path, gint *ok)
3149 {
3150         gchar *real_path;
3151         gchar separator;
3152
3153         g_return_val_if_fail(folder != NULL, NULL);
3154         g_return_val_if_fail(path != NULL, NULL);
3155
3156         real_path = imap_utf8_to_modified_utf7(path, FALSE);
3157         separator = imap_get_path_separator(session, folder, path, ok);
3158         imap_path_separator_subst(real_path, separator);
3159
3160         return real_path;
3161 }
3162
3163 static gint imap_set_message_flags(IMAPSession *session,
3164                                    IMAPFolderItem *item,
3165                                    MsgNumberList *numlist,
3166                                    IMAPFlags flags,
3167                                    GSList *tags,
3168                                    gboolean is_set)
3169 {
3170         gint ok = 0;
3171         GSList *seq_list;
3172         GSList * cur;
3173         gint total = 0;
3174         IMAPFolder *folder = NULL;
3175         GSList *sorted_list = NULL;
3176
3177         if (numlist == NULL || session == NULL)
3178                 return MAILIMAP_ERROR_BAD_STATE;
3179
3180         folder = IMAP_FOLDER(session->folder);
3181
3182         sorted_list = g_slist_copy(numlist);
3183         sorted_list = g_slist_sort(sorted_list, g_int_compare);
3184
3185         cur = g_slist_last(sorted_list);
3186
3187         if (cur)
3188                 total = GPOINTER_TO_INT(cur->data);
3189
3190         seq_list = imap_get_lep_set_from_numlist(IMAP_FOLDER(session->folder), sorted_list);
3191
3192         statusbar_print_all(_("Flagging messages..."));
3193
3194         for(cur = seq_list ; cur != NULL ; cur = g_slist_next(cur)) {
3195                 struct mailimap_set * imapset = (struct mailimap_set *)cur->data;
3196                 struct mailimap_set_item *set_item = clist_content(
3197                                                         clist_begin(imapset->set_list));
3198
3199                 statusbar_progress_all(set_item->set_first, total, 1);
3200
3201                 ok = imap_cmd_store(session, item, imapset,
3202                                     flags, tags, is_set);
3203                 statusbar_progress_all(set_item->set_last, total, 1);
3204                 if (ok != MAILIMAP_NO_ERROR && folder->max_set_size > 20) {
3205                         /* reduce max set size */
3206                         folder->max_set_size /= 2;
3207                 }
3208                 if (ok != MAILIMAP_NO_ERROR && is_fatal(ok)) {
3209                         break;
3210                 }
3211         }
3212
3213         g_slist_free(sorted_list);
3214
3215         statusbar_progress_all(0,0,0);
3216         statusbar_pop_all();
3217
3218         imap_lep_set_free(seq_list);
3219
3220         return ok;
3221 }
3222
3223 typedef struct _select_data {
3224         IMAPSession *session;
3225         gchar *real_path;
3226         gint *exists;
3227         gint *recent;
3228         gint *unseen;
3229         guint32 *uid_validity;
3230         gboolean done;
3231 } select_data;
3232
3233 static gint imap_select(IMAPSession *session, IMAPFolder *folder,
3234                         FolderItem *item,
3235                         gint *exists, gint *recent, gint *unseen,
3236                         guint32 *uid_validity, gint *can_create_flags,
3237                         gboolean block)
3238 {
3239         gchar *real_path;
3240         gint ok;
3241         gint exists_, recent_, unseen_;
3242         guint32 uid_validity_;
3243         gint can_create_flags_;
3244         const gchar *path = item ? item->path:NULL;
3245
3246         if (!item) {
3247                 return MAILIMAP_ERROR_BAD_STATE;
3248         }
3249
3250         if (!exists && !recent && !unseen && !uid_validity && !can_create_flags) {
3251                 if (session->mbox && strcmp(session->mbox, path) == 0)
3252                         return MAILIMAP_NO_ERROR;
3253         }
3254         if (!exists && !recent && !unseen && !uid_validity && can_create_flags) {
3255                 if (session->mbox && strcmp(session->mbox, path) == 0) {
3256                         if (IMAP_FOLDER_ITEM(item)->can_create_flags != ITEM_CAN_CREATE_FLAGS_UNKNOWN)
3257                                 return MAILIMAP_NO_ERROR;
3258                 }
3259         }
3260         if (!exists)
3261                 exists = &exists_;
3262         if (!recent)
3263                 recent = &recent_;
3264         if (!unseen)
3265                 unseen = &unseen_;
3266         if (!uid_validity)
3267                 uid_validity = &uid_validity_;
3268         if (!can_create_flags)
3269                 can_create_flags = &can_create_flags_;
3270
3271         g_free(session->mbox);
3272         session->mbox = NULL;
3273         session->exists = 0;
3274         session->recent = 0;
3275         session->expunge = 0;
3276
3277         real_path = imap_get_real_path(session, folder, path, &ok);
3278         if (is_fatal(ok))
3279                 return ok;
3280         g_slist_free(IMAP_FOLDER_ITEM(item)->ok_flags);
3281         IMAP_FOLDER_ITEM(item)->ok_flags = NULL;
3282         ok = imap_cmd_select(session, real_path,
3283                              exists, recent, unseen, uid_validity, can_create_flags,
3284                              &(IMAP_FOLDER_ITEM(item)->ok_flags), block);
3285         if (ok != MAILIMAP_NO_ERROR) {
3286                 log_warning(LOG_PROTOCOL, _("can't select folder: %s\n"), real_path);
3287         } else {
3288                 session->mbox = g_strdup(path);
3289                 session->folder_content_changed = FALSE;
3290                 session->exists = *exists;
3291                 session->recent = *recent;
3292                 session->expunge = 0;
3293                 session->unseen = *unseen;
3294                 session->uid_validity = *uid_validity;
3295                 debug_print("select: exists %d recent %d expunge %d uid_validity %d can_create_flags %d\n",
3296                         session->exists, session->recent, session->expunge,
3297                         session->uid_validity, *can_create_flags);
3298         }
3299         if (*can_create_flags) {
3300                 IMAP_FOLDER_ITEM(item)->can_create_flags = ITEM_CAN_CREATE_FLAGS;
3301         } else {
3302                 IMAP_FOLDER_ITEM(item)->can_create_flags = ITEM_CANNOT_CREATE_FLAGS;
3303         }
3304         g_free(real_path);
3305
3306         return ok;
3307 }
3308
3309 static gint imap_status(IMAPSession *session, IMAPFolder *folder,
3310                         const gchar *path, IMAPFolderItem *item,
3311                         gint *messages,
3312                         guint32 *uid_next, guint32 *uid_validity,
3313                         gint *unseen, gboolean block)
3314 {
3315         int r;
3316         clistiter * iter;
3317         struct mailimap_mailbox_data_status * data_status;
3318         int got_values;
3319         gchar *real_path;
3320         guint mask = 0;
3321
3322         real_path = imap_get_real_path(session, folder, path, &r);
3323         if (is_fatal(r))
3324                 return r;
3325
3326         if (messages) {
3327                 mask |= 1 << 0;
3328                 *messages = 0;
3329         }
3330         if (uid_next) {
3331                 mask |= 1 << 2;
3332                 *uid_next = 0;
3333         }
3334         if (uid_validity) {
3335                 mask |= 1 << 3;
3336                 *uid_validity = 0;
3337         }
3338         if (unseen) {
3339                 mask |= 1 << 4;
3340                 *unseen = 0;
3341         }
3342
3343         if (session->mbox != NULL &&
3344             !strcmp(session->mbox, item->item.path)) {
3345                 r = imap_cmd_close(session);
3346                 if (r != MAILIMAP_NO_ERROR) {
3347                         debug_print("close err %d\n", r);
3348                         return r;
3349                 }
3350         }
3351
3352         r = imap_threaded_status(FOLDER(folder), real_path,
3353                 &data_status, mask);
3354
3355         g_free(real_path);
3356         if (r != MAILIMAP_NO_ERROR) {
3357                 imap_handle_error(SESSION(session), r);
3358                 debug_print("status err %d\n", r);
3359                 return r;
3360         }
3361
3362         if (data_status->st_info_list == NULL) {
3363                 mailimap_mailbox_data_status_free(data_status);
3364                 debug_print("status->st_info_list == NULL\n");
3365                 return MAILIMAP_ERROR_BAD_STATE;
3366         }
3367
3368         got_values = 0;
3369         for(iter = clist_begin(data_status->st_info_list) ; iter != NULL ;
3370             iter = clist_next(iter)) {
3371                 struct mailimap_status_info * info;
3372
3373                 info = clist_content(iter);
3374                 switch (info->st_att) {
3375                 case MAILIMAP_STATUS_ATT_MESSAGES:
3376                         if (messages) {
3377                                 * messages = info->st_value;
3378                                 got_values |= 1 << 0;
3379                         }
3380                         break;
3381
3382                 case MAILIMAP_STATUS_ATT_UIDNEXT:
3383                         if (uid_next) {
3384                                 * uid_next = info->st_value;
3385                                 got_values |= 1 << 2;
3386                         }
3387                         break;
3388
3389                 case MAILIMAP_STATUS_ATT_UIDVALIDITY:
3390                         if (uid_validity) {
3391                                 * uid_validity = info->st_value;
3392                                 got_values |= 1 << 3;
3393                         }
3394                         break;
3395
3396                 case MAILIMAP_STATUS_ATT_UNSEEN:
3397                         if (unseen) {
3398                                 * unseen = info->st_value;
3399                                 got_values |= 1 << 4;
3400                         }
3401                         break;
3402                 }
3403         }
3404         mailimap_mailbox_data_status_free(data_status);
3405
3406         if (got_values != mask) {
3407                 g_warning("status: incomplete values received (%d)\n", got_values);
3408         }
3409         return MAILIMAP_NO_ERROR;
3410 }
3411
3412 static void imap_free_capabilities(IMAPSession *session)
3413 {
3414         slist_free_strings(session->capability);
3415         g_slist_free(session->capability);
3416         session->capability = NULL;
3417 }
3418
3419 /* low-level IMAP4rev1 commands */
3420
3421 static gint imap_cmd_login(IMAPSession *session,
3422                            const gchar *user, const gchar *pass,
3423                            const gchar *type)
3424 {
3425         int r;
3426         gint ok;
3427
3428         if (!strcmp(type, "LOGIN") && imap_has_capability(session, "LOGINDISABLED")) {
3429                 gint ok = MAILIMAP_ERROR_BAD_STATE;
3430                 if (imap_has_capability(session, "STARTTLS")) {
3431 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
3432                         log_warning(LOG_PROTOCOL, _("Server requires TLS to log in.\n"));
3433                         ok = imap_cmd_starttls(session);
3434                         if (ok != MAILIMAP_NO_ERROR) {
3435                                 log_warning(LOG_PROTOCOL, _("Can't start TLS session.\n"));
3436                                 return ok;
3437                         } else {
3438                                 /* refresh capas */
3439                                 imap_free_capabilities(session);
3440                                 if ((r = imap_get_capabilities(session)) != MAILIMAP_NO_ERROR) {
3441                                         imap_handle_error(SESSION(session), r);
3442                                         log_warning(LOG_PROTOCOL, _("Can't refresh capabilities.\n"));
3443                                         return r;
3444                                 }
3445                         }
3446 #else
3447                         log_error(LOG_PROTOCOL, _("Connection to %s failed: "
3448                                         "server requires TLS, but Claws Mail "
3449                                         "has been compiled without OpenSSL "
3450                                         "support.\n"),
3451                                         SESSION(session)->server);
3452                         return MAILIMAP_ERROR_LOGIN;
3453 #endif
3454                 } else {
3455                         log_error(LOG_PROTOCOL, _("Server logins are disabled.\n"));
3456                         return MAILIMAP_ERROR_LOGIN;
3457                 }
3458         }
3459
3460         log_print(LOG_PROTOCOL, "IMAP4> Logging %s to %s using %s\n",
3461                         user,
3462                         SESSION(session)->server,
3463                         type);
3464         r = imap_threaded_login(session->folder, user, pass, type);
3465         if (r != MAILIMAP_NO_ERROR) {
3466                 imap_handle_error(SESSION(session), r);
3467                 log_print(LOG_PROTOCOL, "IMAP4< Error logging in to %s\n",
3468                                 SESSION(session)->server);
3469                 ok = r;
3470         } else {
3471                 log_print(LOG_PROTOCOL, "IMAP4< Login to %s successful\n",
3472                                 SESSION(session)->server);
3473                 ok = MAILIMAP_NO_ERROR;
3474         }
3475         return ok;
3476 }
3477
3478 static gint imap_cmd_noop(IMAPSession *session)
3479 {
3480         int r;
3481         unsigned int exists, recent, expunge, unseen, uidnext, uidval;
3482
3483         r = imap_threaded_noop(session->folder, &exists, &recent, &expunge, &unseen, &uidnext, &uidval);
3484         if (r != MAILIMAP_NO_ERROR) {
3485                 imap_handle_error(SESSION(session), r);
3486                 debug_print("noop err %d\n", r);
3487                 return r;
3488         }
3489
3490         session->folder_content_changed = FALSE;
3491
3492         if ((exists && exists != session->exists)
3493          || (recent && recent != session->recent)
3494          || (expunge && expunge != session->expunge)
3495          || (unseen && unseen != session->unseen)) {
3496                 session->folder_content_changed = TRUE;
3497         }
3498         if (uidnext != 0 && uidnext != session->uid_next) {
3499                 session->uid_next = uidnext;
3500                 session->folder_content_changed = TRUE;
3501         }
3502         if (uidval != 0 && uidval != session->uid_validity) {
3503                 session->uid_validity = uidval;
3504                 session->folder_content_changed = TRUE;
3505         }
3506
3507         session->exists = exists;
3508         session->recent = recent;
3509         session->expunge = expunge;
3510         session->unseen = unseen;
3511
3512         session_set_access_time(SESSION(session));
3513
3514         return MAILIMAP_NO_ERROR;
3515 }
3516
3517 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
3518 static gint imap_cmd_starttls(IMAPSession *session)
3519 {
3520         int r;
3521
3522         r = imap_threaded_starttls(session->folder,
3523                 SESSION(session)->server, SESSION(session)->port);
3524         if (r != MAILIMAP_NO_ERROR) {
3525                 imap_handle_error(SESSION(session), r);
3526                 debug_print("starttls err %d\n", r);
3527                 return r;
3528         }
3529         return MAILIMAP_NO_ERROR;
3530 }
3531 #endif
3532
3533 static gint imap_cmd_select(IMAPSession *session, const gchar *folder,
3534                             gint *exists, gint *recent, gint *unseen,
3535                             guint32 *uid_validity, gint *can_create_flags,
3536                             GSList **ok_flags, gboolean block)
3537 {
3538         int r;
3539
3540         r = imap_threaded_select(session->folder, folder,
3541                                  exists, recent, unseen, uid_validity, can_create_flags, ok_flags);
3542         if (r != MAILIMAP_NO_ERROR) {
3543                 imap_handle_error(SESSION(session), r);
3544                 debug_print("select err %d\n", r);
3545                 return r;
3546         }
3547         return MAILIMAP_NO_ERROR;
3548 }
3549
3550 static gint imap_cmd_close(IMAPSession *session)
3551 {
3552         int r;
3553
3554         r = imap_threaded_close(session->folder);
3555         if (r != MAILIMAP_NO_ERROR) {
3556                 imap_handle_error(SESSION(session), r);
3557                 debug_print("close err %d\n", r);
3558                 return r;
3559         }
3560         g_free(session->mbox);
3561         session->mbox = NULL;
3562         session->exists = 0;
3563         session->recent = 0;
3564         session->expunge = 0;
3565         return MAILIMAP_NO_ERROR;
3566 }
3567
3568 static gint imap_cmd_examine(IMAPSession *session, const gchar *folder,
3569                              gint *exists, gint *recent, gint *unseen,
3570                              guint32 *uid_validity, gboolean block)
3571 {
3572         int r;
3573
3574         r = imap_threaded_examine(session->folder, folder,
3575                                   exists, recent, unseen, uid_validity);
3576         if (r != MAILIMAP_NO_ERROR) {
3577                 imap_handle_error(SESSION(session), r);
3578                 debug_print("examine err %d\n", r);
3579
3580                 return r;
3581         }
3582         return MAILIMAP_NO_ERROR;
3583 }
3584
3585 static gint imap_cmd_create(IMAPSession *session, const gchar *folder)
3586 {
3587         int r;
3588
3589         r = imap_threaded_create(session->folder, folder);
3590         if (r != MAILIMAP_NO_ERROR) {
3591                 imap_handle_error(SESSION(session), r);
3592                 return r;
3593         }
3594
3595         return MAILIMAP_NO_ERROR;
3596 }
3597
3598 static gint imap_cmd_rename(IMAPSession *session, const gchar *old_folder,
3599                             const gchar *new_folder)
3600 {
3601         int r;
3602
3603         r = imap_threaded_rename(session->folder, old_folder,
3604                                  new_folder);
3605         if (r != MAILIMAP_NO_ERROR) {
3606                 imap_handle_error(SESSION(session), r);
3607                 return r;
3608         }
3609
3610         return MAILIMAP_NO_ERROR;
3611 }
3612
3613 static gint imap_cmd_delete(IMAPSession *session, const gchar *folder)
3614 {
3615         int r;
3616
3617
3618         r = imap_threaded_delete(session->folder, folder);
3619         if (r != MAILIMAP_NO_ERROR) {
3620                 imap_handle_error(SESSION(session), r);
3621                 return r;
3622         }
3623
3624         return MAILIMAP_NO_ERROR;
3625 }
3626
3627 typedef struct _fetch_data {
3628         IMAPSession *session;
3629         guint32 uid;
3630         const gchar *filename;
3631         gboolean headers;
3632         gboolean body;
3633         gboolean done;
3634 } fetch_data;
3635
3636 static void *imap_cmd_fetch_thread(void *data)
3637 {
3638         fetch_data *stuff = (fetch_data *)data;
3639         IMAPSession *session = stuff->session;
3640         guint32 uid = stuff->uid;
3641         const gchar *filename = stuff->filename;
3642         int r;
3643
3644         if (stuff->body) {
3645                 r = imap_threaded_fetch_content(session->folder,
3646                                                uid, 1, filename);
3647         }
3648         else {
3649                 r = imap_threaded_fetch_content(session->folder,
3650                                                 uid, 0, filename);
3651         }
3652         if (r != MAILIMAP_NO_ERROR) {
3653                 imap_handle_error(SESSION(session), r);
3654                 debug_print("fetch err %d\n", r);
3655                 return GINT_TO_POINTER(r);
3656         }
3657         return GINT_TO_POINTER(MAILIMAP_NO_ERROR);
3658 }
3659
3660 static gint imap_cmd_fetch(IMAPSession *session, guint32 uid,
3661                                 const gchar *filename, gboolean headers,
3662                                 gboolean body)
3663 {
3664         fetch_data *data = g_new0(fetch_data, 1);
3665         int result = 0;
3666         data->done = FALSE;
3667         data->session = session;
3668         data->uid = uid;
3669         data->filename = filename;
3670         data->headers = headers;
3671         data->body = body;
3672
3673         if (prefs_common.work_offline &&
3674             !inc_offline_should_override(FALSE,
3675                 _("Claws Mail needs network access in order "
3676                   "to access the IMAP server."))) {
3677                 g_free(data);
3678                 return -1;
3679         }
3680         statusbar_print_all(_("Fetching message..."));
3681         result = GPOINTER_TO_INT(imap_cmd_fetch_thread(data));
3682         statusbar_pop_all();
3683         g_free(data);
3684         return result;
3685 }
3686
3687
3688 static gint imap_cmd_append(IMAPSession *session,
3689                             IMAPFolderItem *item,
3690                             const gchar *destfolder,
3691                             const gchar *file, IMAPFlags flags,
3692                             guint32 *new_uid)
3693 {
3694         struct mailimap_flag_list * flag_list;
3695         int r;
3696
3697         g_return_val_if_fail(file != NULL, MAILIMAP_ERROR_BAD_STATE);
3698
3699         flag_list = imap_flag_to_lep(item, flags, NULL);
3700         lock_session(session);
3701         r = imap_threaded_append(session->folder, destfolder,
3702                          file, flag_list, (int *)new_uid);
3703         mailimap_flag_list_free(flag_list);
3704
3705         if (r != MAILIMAP_NO_ERROR) {
3706                 imap_handle_error(SESSION(session), r);
3707                 debug_print("append err %d\n", r);
3708                 return r;
3709         }
3710
3711         unlock_session(session);
3712
3713         return MAILIMAP_NO_ERROR;
3714 }
3715
3716 static gint imap_cmd_copy(IMAPSession *session, struct mailimap_set * set,
3717                           const gchar *destfolder, GRelation *uid_mapping,
3718                           struct mailimap_set **source, struct mailimap_set **dest)
3719 {
3720         int r;
3721
3722         g_return_val_if_fail(session != NULL, MAILIMAP_ERROR_BAD_STATE);
3723         g_return_val_if_fail(set != NULL, MAILIMAP_ERROR_BAD_STATE);
3724         g_return_val_if_fail(destfolder != NULL, MAILIMAP_ERROR_BAD_STATE);
3725
3726         r = imap_threaded_copy(session->folder, set, destfolder, source, dest);
3727         if (r != MAILIMAP_NO_ERROR) {
3728                 imap_handle_error(SESSION(session), r);
3729                 return r;
3730         }
3731
3732         return MAILIMAP_NO_ERROR;
3733 }
3734
3735 static gint imap_cmd_store(IMAPSession *session,
3736                            IMAPFolderItem *item,
3737                            struct mailimap_set * set,
3738                            IMAPFlags flags, GSList *tags, int do_add)
3739 {
3740         int r;
3741         struct mailimap_flag_list * flag_list = NULL;
3742         struct mailimap_store_att_flags * store_att_flags;
3743
3744         flag_list = imap_flag_to_lep(item, flags, tags);
3745
3746         if (do_add)
3747                 store_att_flags =
3748                         mailimap_store_att_flags_new_add_flags_silent(flag_list);
3749         else
3750                 store_att_flags =
3751                         mailimap_store_att_flags_new_remove_flags_silent(flag_list);
3752
3753         r = imap_threaded_store(session->folder, set, store_att_flags);
3754         mailimap_store_att_flags_free(store_att_flags);
3755         if (r != MAILIMAP_NO_ERROR) {
3756                 imap_handle_error(SESSION(session), r);
3757                 return r;
3758         }
3759
3760         return MAILIMAP_NO_ERROR;
3761 }
3762
3763 static gint imap_cmd_expunge(IMAPSession *session)
3764 {
3765         int r;
3766
3767         if (prefs_common.work_offline &&
3768             !inc_offline_should_override(FALSE,
3769                 _("Claws Mail needs network access in order "
3770                   "to access the IMAP server."))) {
3771                 return -1;
3772         }
3773
3774         r = imap_threaded_expunge(session->folder);
3775         if (r != MAILIMAP_NO_ERROR) {
3776                 imap_handle_error(SESSION(session), r);
3777                 return r;
3778         }
3779
3780         return MAILIMAP_NO_ERROR;
3781 }
3782
3783 static void imap_path_separator_subst(gchar *str, gchar separator)
3784 {
3785         gchar *p;
3786         gboolean in_escape = FALSE;
3787
3788         if (!separator || separator == '/') return;
3789
3790         for (p = str; *p != '\0'; p++) {
3791                 if (*p == '/' && !in_escape)
3792                         *p = separator;
3793                 else if (*p == '&' && *(p + 1) != '-' && !in_escape)
3794                         in_escape = TRUE;
3795                 else if (*p == '-' && in_escape)
3796                         in_escape = FALSE;
3797         }
3798 }
3799
3800 static gboolean imap_rename_folder_func(GNode *node, gpointer data)
3801 {
3802         FolderItem *item = node->data;
3803         gchar **paths = data;
3804         const gchar *oldpath = paths[0];
3805         const gchar *newpath = paths[1];
3806         gchar *real_oldpath, *real_newpath;
3807         gchar *base;
3808         gchar *new_itempath;
3809         gint oldpathlen;
3810         IMAPSession *session = imap_session_get(item->folder);
3811         gint ok;
3812         oldpathlen = strlen(oldpath);
3813         if (strncmp(oldpath, item->path, oldpathlen) != 0) {
3814                 g_warning("path doesn't match: %s, %s\n", oldpath, item->path);
3815                 return TRUE;
3816         }
3817
3818         base = item->path + oldpathlen;
3819         while (*base == G_DIR_SEPARATOR) base++;
3820         if (*base == '\0')
3821                 new_itempath = g_strdup(newpath);
3822         else
3823                 new_itempath = g_strconcat(newpath, G_DIR_SEPARATOR_S, base,
3824                                            NULL);
3825
3826         real_oldpath = imap_get_real_path(session, IMAP_FOLDER(item->folder), item->path, &ok);
3827         g_free(item->path);
3828         item->path = new_itempath;
3829
3830         real_newpath = imap_get_real_path(session, IMAP_FOLDER(item->folder), item->path, &ok);
3831
3832         imap_threaded_subscribe(item->folder, real_oldpath, FALSE);
3833         imap_threaded_subscribe(item->folder, real_newpath, TRUE);
3834
3835         g_free(real_oldpath);
3836         g_free(real_newpath);
3837         return FALSE;
3838 }
3839
3840 static gint get_list_of_uids(IMAPSession *session, Folder *folder, IMAPFolderItem *item, GSList **msgnum_list)
3841 {
3842         GSList *uidlist, *elem;
3843         int r = -1;
3844         clist * lep_uidlist;
3845         gint ok, nummsgs = 0, lastuid_old;
3846
3847         if (session == NULL) {
3848                 return -1;
3849         }
3850
3851         ok = imap_select(session, IMAP_FOLDER(folder), FOLDER_ITEM(item),
3852                          NULL, NULL, NULL, NULL, NULL, TRUE);
3853         if (ok != MAILIMAP_NO_ERROR) {
3854                 return -1;
3855         }
3856
3857         g_slist_free(item->uid_list);
3858         item->uid_list = NULL;
3859
3860         uidlist = NULL;
3861
3862         if (folder->account && folder->account->low_bandwidth) {
3863                 r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_SIMPLE, NULL,
3864                                  &lep_uidlist);
3865         }
3866
3867         if (r == MAILIMAP_NO_ERROR) {
3868                 GSList * fetchuid_list =
3869                         imap_uid_list_from_lep(lep_uidlist);
3870                 mailimap_search_result_free(lep_uidlist);
3871
3872                 uidlist = g_slist_concat(fetchuid_list, uidlist);
3873         } else {
3874                 carray * lep_uidtab;
3875                 if (r != -1) { /* inited */
3876                         imap_handle_error(SESSION(session), r);
3877                         if (is_fatal(r))
3878                                 return -1;
3879                 }
3880                 r = imap_threaded_fetch_uid(folder, 1,
3881                                     &lep_uidtab);
3882                 if (r == MAILIMAP_NO_ERROR) {
3883                         GSList * fetchuid_list =
3884                                 imap_uid_list_from_lep_tab(lep_uidtab);
3885                         imap_fetch_uid_list_free(lep_uidtab);
3886                         uidlist = g_slist_concat(fetchuid_list, uidlist);
3887                 }
3888         }
3889
3890         if (r != MAILIMAP_NO_ERROR) {
3891                 imap_handle_error(SESSION(session), r);
3892                 return -1;
3893         }
3894
3895         lastuid_old = item->lastuid;
3896
3897         for (elem = uidlist; elem != NULL; elem = g_slist_next(elem)) {
3898                 guint msgnum;
3899
3900                 msgnum = GPOINTER_TO_INT(elem->data);
3901
3902                 *msgnum_list = g_slist_prepend(*msgnum_list, GINT_TO_POINTER(msgnum));
3903                 item->uid_list = g_slist_prepend(item->uid_list, GINT_TO_POINTER(msgnum));
3904                 nummsgs++;
3905         }
3906         g_slist_free(uidlist);
3907
3908         unlock_session(session); /* locked from imap_get_num_list */
3909
3910         return nummsgs;
3911
3912 }
3913
3914 gint imap_get_num_list(Folder *folder, FolderItem *_item, GSList **msgnum_list, gboolean *old_uids_valid)
3915 {
3916         IMAPFolderItem *item = (IMAPFolderItem *)_item;
3917         IMAPSession *session;
3918         gint nummsgs;
3919         GSList *uidlist = NULL;
3920         gchar *dir;
3921         gboolean selected_folder;
3922         gint known_list_len = 0;
3923         debug_print("get_num_list\n");
3924
3925         g_return_val_if_fail(folder != NULL, -1);
3926         g_return_val_if_fail(item != NULL, -1);
3927         g_return_val_if_fail(item->item.path != NULL, -1);
3928         g_return_val_if_fail(FOLDER_CLASS(folder) == &imap_class, -1);
3929         g_return_val_if_fail(folder->account != NULL, -1);
3930
3931         known_list_len = g_slist_length(item->uid_list);
3932         if (!item->should_update) {
3933                 debug_print("get_num_list: nothing to update\n");
3934                 *old_uids_valid = TRUE;
3935                 if (known_list_len == item->item.total_msgs
3936                  && known_list_len > 0) {
3937                         *msgnum_list = g_slist_copy(item->uid_list);
3938                         return known_list_len;
3939                 } else {
3940                         debug_print("don't know the list length...\n");
3941                 }
3942         }
3943
3944         if (prefs_common.work_offline &&
3945             !inc_offline_should_override(FALSE,
3946                 _("Claws Mail needs network access in order "
3947                   "to access the IMAP server."))) {
3948                 return -1;
3949         }
3950
3951         debug_print("getting session...\n");
3952         session = imap_session_get(folder);
3953         g_return_val_if_fail(session != NULL, -1);
3954
3955         lock_session(session); /* unlocked by get_list_of_uids */
3956         if (FOLDER_ITEM(item)->path)
3957                 statusbar_print_all(_("Scanning folder %s%c%s ..."),
3958                                       FOLDER_ITEM(item)->folder->name,
3959                                       G_DIR_SEPARATOR,
3960                                       FOLDER_ITEM(item)->path);
3961         else
3962                 statusbar_print_all(_("Scanning folder %s ..."),
3963                                       FOLDER_ITEM(item)->folder->name);
3964
3965         selected_folder = (session->mbox != NULL) &&
3966                           (!strcmp(session->mbox, item->item.path));
3967
3968         if (item->should_trash_cache) {
3969                 *old_uids_valid = FALSE;
3970                 debug_print("get_num_list: trashing num list\n");
3971                 debug_print("Freeing imap uid cache\n");
3972                 item->lastuid = 0;
3973                 g_slist_free(item->uid_list);
3974                 item->uid_list = NULL;
3975
3976                 imap_delete_all_cached_messages((FolderItem *)item);
3977         } else {
3978                 debug_print("get_num_list: updating num list\n");
3979                 *old_uids_valid = TRUE;
3980         }
3981
3982         nummsgs = get_list_of_uids(session, folder, item, &uidlist);
3983         /* session could be broken now, in case of fatal error */
3984
3985         debug_print("get_num_list: got %d msgs\n", nummsgs);
3986
3987         if (nummsgs < 0) {
3988                 statusbar_pop_all();
3989                 return -1;
3990         }
3991
3992         *msgnum_list = uidlist;
3993
3994         dir = folder_item_get_path((FolderItem *)item);
3995         debug_print("removing old messages from %s\n", dir);
3996         remove_numbered_files_not_in_list(dir, *msgnum_list);
3997         g_free(dir);
3998
3999         debug_print("get_num_list - ok - %i\n", nummsgs);
4000         statusbar_pop_all();
4001         item->should_trash_cache = FALSE;
4002         item->should_update = FALSE;
4003         return nummsgs;
4004 }
4005
4006 static MsgInfo *imap_parse_msg(const gchar *file, FolderItem *item)
4007 {
4008         MsgInfo *msginfo;
4009         MsgFlags flags;
4010
4011         flags.perm_flags = MSG_NEW|MSG_UNREAD;
4012         flags.tmp_flags = 0;
4013
4014         g_return_val_if_fail(item != NULL, NULL);
4015         g_return_val_if_fail(file != NULL, NULL);
4016
4017         if (folder_has_parent_of_type(item, F_QUEUE)) {
4018                 MSG_SET_TMP_FLAGS(flags, MSG_QUEUED);
4019         } else if (folder_has_parent_of_type(item, F_DRAFT)) {
4020                 MSG_SET_TMP_FLAGS(flags, MSG_DRAFT);
4021         }
4022
4023         msginfo = procheader_parse_file(file, flags, FALSE, FALSE);
4024         if (!msginfo) return NULL;
4025
4026         msginfo->plaintext_file = g_strdup(file);
4027         msginfo->folder = item;
4028
4029         return msginfo;
4030 }
4031
4032 GSList *imap_get_msginfos(Folder *folder, FolderItem *item,
4033                           GSList *msgnum_list)
4034 {
4035         IMAPSession *session;
4036         MsgInfoList *ret = NULL;
4037         gint ok;
4038
4039         debug_print("get_msginfos\n");
4040
4041         g_return_val_if_fail(folder != NULL, NULL);
4042         g_return_val_if_fail(item != NULL, NULL);
4043         g_return_val_if_fail(msgnum_list != NULL, NULL);
4044
4045         debug_print("getting session...\n");
4046         session = imap_session_get(folder);
4047         g_return_val_if_fail(session != NULL, NULL);
4048
4049         lock_session(session); /* unlocked later in the function */
4050
4051         debug_print("IMAP getting msginfos\n");
4052         ok = imap_select(session, IMAP_FOLDER(folder), item,
4053                          NULL, NULL, NULL, NULL, NULL, FALSE);
4054         if (ok != MAILIMAP_NO_ERROR) {
4055                 return NULL;
4056         }
4057         if (!(folder_has_parent_of_type(item, F_DRAFT) ||
4058               folder_has_parent_of_type(item, F_QUEUE))) {
4059                 ret = g_slist_concat(ret,
4060                         imap_get_uncached_messages(session, item,
4061                                                    msgnum_list, &ok));
4062                 if (ok != MAILIMAP_NO_ERROR)
4063                         return NULL;
4064                 unlock_session(session);
4065         } else {
4066                 MsgNumberList *sorted_list, *elem, *llast = NULL;
4067                 gint startnum, lastnum;
4068
4069                 unlock_session(session);
4070
4071                 sorted_list = g_slist_sort(g_slist_copy(msgnum_list), g_int_compare);
4072
4073                 startnum = lastnum = GPOINTER_TO_INT(sorted_list->data);
4074
4075                 llast = g_slist_last(ret);
4076                 for (elem = sorted_list;; elem = g_slist_next(elem)) {
4077                         guint num = 0;
4078
4079                         if (elem)
4080                                 num = GPOINTER_TO_INT(elem->data);
4081
4082                         if (num > lastnum + 1 || elem == NULL) {
4083                                 int i;
4084                                 for (i = startnum; i <= lastnum; ++i) {
4085                                         gchar *file;
4086                                         file = imap_fetch_msg(folder, item, i);
4087                                         if (file != NULL) {
4088                                                 MsgInfo *msginfo = imap_parse_msg(file, item);
4089                                                 if (msginfo != NULL) {
4090                                                         msginfo->msgnum = i;
4091                                                         if (llast == NULL)
4092                                                                 llast = ret = g_slist_append(ret, msginfo);
4093                                                         else {
4094                                                                 llast = g_slist_append(llast, msginfo);
4095                                                                 llast = llast->next;
4096                                                         }
4097                                                 }
4098                                                 g_free(file);
4099                                         }
4100                                 }
4101
4102                                 if (elem == NULL)
4103                                         break;
4104
4105                                 startnum = num;
4106                         }
4107                         lastnum = num;
4108                 }
4109
4110                 g_slist_free(sorted_list);
4111         }
4112         return ret;
4113 }
4114
4115 MsgInfo *imap_get_msginfo(Folder *folder, FolderItem *item, gint uid)
4116 {
4117         MsgInfo *msginfo = NULL;
4118         MsgInfoList *msginfolist;
4119         MsgNumberList numlist;
4120
4121         numlist.next = NULL;
4122         numlist.data = GINT_TO_POINTER(uid);
4123
4124         msginfolist = imap_get_msginfos(folder, item, &numlist);
4125         if (msginfolist != NULL) {
4126                 msginfo = msginfolist->data;
4127                 g_slist_free(msginfolist);
4128         }
4129
4130         return msginfo;
4131 }
4132
4133 gboolean imap_scan_required(Folder *folder, FolderItem *_item)
4134 {
4135         IMAPSession *session;
4136         IMAPFolderItem *item = (IMAPFolderItem *)_item;
4137         gint ok, exists = 0, unseen = 0;
4138         guint32 uid_next = 0, uid_val = 0;
4139         gboolean selected_folder;
4140
4141         g_return_val_if_fail(folder != NULL, FALSE);
4142         g_return_val_if_fail(item != NULL, FALSE);
4143         g_return_val_if_fail(item->item.folder != NULL, FALSE);
4144         g_return_val_if_fail(FOLDER_CLASS(item->item.folder) == &imap_class, FALSE);
4145
4146         if (item->item.path == NULL)
4147                 return FALSE;
4148
4149         if (item->should_update) {
4150                 debug_print("scan already required\n");
4151                 return TRUE;
4152         }
4153         debug_print("getting session...\n");
4154         session = imap_session_get(folder);
4155
4156         g_return_val_if_fail(session != NULL, FALSE);
4157         lock_session(session); /* unlocked later in the function */
4158
4159         selected_folder = (session->mbox != NULL) &&
4160                           (!strcmp(session->mbox, item->item.path));
4161         if (selected_folder) {
4162                 if (!session->folder_content_changed) {
4163                         ok = imap_cmd_noop(session);
4164                         if (ok != MAILIMAP_NO_ERROR) {
4165                                 debug_print("disconnected!\n");
4166                                 if (!is_fatal(ok))
4167                                         session = imap_reconnect_if_possible(folder, session);
4168                                 else
4169                                         session = imap_session_get(folder);
4170                                 if (session == NULL)
4171                                         return FALSE;
4172                         }
4173
4174                         if (session->folder_content_changed) {
4175                                 debug_print("CHANGED (self-noop)! scan_required\n");
4176                                 item->should_update = TRUE;
4177                                 if (session->uid_validity && session->uid_validity != item->item.mtime) {
4178                                         item->item.mtime = session->uid_validity;
4179                                         item->should_trash_cache = TRUE;
4180                                 }
4181                                 unlock_session(session);
4182                                 return TRUE;
4183                         }
4184                 } else {
4185                         debug_print("CHANGED (previous noop)! scan_required\n");
4186                         item->should_update = TRUE;
4187                         if (session->uid_validity && session->uid_validity != item->item.mtime) {
4188                                 item->item.mtime = session->uid_validity;
4189                                 item->should_trash_cache = TRUE;
4190                         }
4191                         unlock_session(session);
4192                         return TRUE;
4193                 }
4194         } else {
4195                 ok = imap_status(session, IMAP_FOLDER(folder), item->item.path, IMAP_FOLDER_ITEM(item),
4196                                  &exists, &uid_next, &uid_val, &unseen, FALSE);
4197                 if (ok != MAILIMAP_NO_ERROR) {
4198                         return FALSE;
4199                 }
4200
4201                 debug_print("exists %d, item->item.total_msgs %d\n",
4202                         exists, item->item.total_msgs);
4203                 if (exists != item->item.total_msgs
4204                     || unseen != item->item.unread_msgs
4205                     || uid_next != item->uid_next
4206                     || uid_val != item->item.mtime) {
4207                         debug_print("CHANGED (status)! scan_required\n");
4208                         item->last_change = time(NULL);
4209                         item->should_update = TRUE;
4210                         item->uid_next = uid_next;
4211                         if (uid_val != item->item.mtime) {
4212                                 item->item.mtime = uid_val;
4213                                 item->should_trash_cache = TRUE;
4214                         }
4215                         unlock_session(session);
4216                         return TRUE;
4217                 }
4218         }
4219         unlock_session(session);
4220
4221         item->should_update = FALSE;
4222         return FALSE;
4223 }
4224
4225 void imap_change_flags(Folder *folder, FolderItem *item, MsgInfo *msginfo, MsgPermFlags newflags)
4226 {
4227         IMAPSession *session;
4228         IMAPFlags flags_set = 0, flags_unset = 0;
4229         gint ok = MAILIMAP_NO_ERROR;
4230         MsgNumberList numlist;
4231         hashtable_data *ht_data = NULL;
4232
4233         g_return_if_fail(folder != NULL);
4234         g_return_if_fail(folder->klass == &imap_class);
4235         g_return_if_fail(item != NULL);
4236         g_return_if_fail(item->folder == folder);
4237         g_return_if_fail(msginfo != NULL);
4238         g_return_if_fail(msginfo->folder == item);
4239
4240         if (!MSG_IS_MARKED(msginfo->flags) &&  (newflags & MSG_MARKED))
4241                 flags_set |= IMAP_FLAG_FLAGGED;
4242         if ( MSG_IS_MARKED(msginfo->flags) && !(newflags & MSG_MARKED))
4243                 flags_unset |= IMAP_FLAG_FLAGGED;
4244
4245         if (!MSG_IS_UNREAD(msginfo->flags) &&  (newflags & MSG_UNREAD))
4246                 flags_unset |= IMAP_FLAG_SEEN;
4247         if ( MSG_IS_UNREAD(msginfo->flags) && !(newflags & MSG_UNREAD))
4248                 flags_set |= IMAP_FLAG_SEEN;
4249
4250         if (!MSG_IS_REPLIED(msginfo->flags) &&  (newflags & MSG_REPLIED))
4251                 flags_set |= IMAP_FLAG_ANSWERED;
4252         if ( MSG_IS_REPLIED(msginfo->flags) && !(newflags & MSG_REPLIED))
4253                 flags_unset |= IMAP_FLAG_ANSWERED;
4254
4255         if (!MSG_IS_FORWARDED(msginfo->flags) &&  (newflags & MSG_FORWARDED))
4256                 flags_set |= IMAP_FLAG_FORWARDED;
4257         if ( MSG_IS_FORWARDED(msginfo->flags) && !(newflags & MSG_FORWARDED))
4258                 flags_unset |= IMAP_FLAG_FORWARDED;
4259
4260         if (!MSG_IS_DELETED(msginfo->flags) &&  (newflags & MSG_DELETED))
4261                 flags_set |= IMAP_FLAG_DELETED;
4262         if ( MSG_IS_DELETED(msginfo->flags) && !(newflags & MSG_DELETED))
4263                 flags_unset |= IMAP_FLAG_DELETED;
4264
4265         if (!flags_set && !flags_unset) {
4266                 /* the changed flags were not translatable to IMAP-speak.
4267                  * like MSG_POSTFILTERED, so just apply. */
4268                 msginfo->flags.perm_flags = newflags;
4269                 return;
4270         }
4271
4272         debug_print("getting session...\n");
4273         session = imap_session_get(folder);
4274         if (!session) {
4275                 return;
4276         }
4277
4278         if ((ok = imap_select(session, IMAP_FOLDER(folder), msginfo->folder,
4279             NULL, NULL, NULL, NULL, NULL, FALSE)) != MAILIMAP_NO_ERROR) {
4280                 return;
4281         }
4282         numlist.next = NULL;
4283         numlist.data = GINT_TO_POINTER(msginfo->msgnum);
4284
4285         if (IMAP_FOLDER_ITEM(item)->batching) {
4286                 /* instead of performing an UID STORE command for each message change,
4287                  * as a lot of them can change "together", we just fill in hashtables
4288                  * and defer the treatment so that we're able to send only one
4289                  * command.
4290                  */
4291                 debug_print("IMAP batch mode on, deferring flags change\n");
4292                 if (flags_set) {
4293                         ht_data = g_hash_table_lookup(IMAP_FOLDER_ITEM(item)->flags_set_table,
4294                                 GINT_TO_POINTER(flags_set));
4295                         if (ht_data == NULL) {
4296                                 ht_data = g_new0(hashtable_data, 1);
4297                                 ht_data->item = IMAP_FOLDER_ITEM(item);
4298                                 g_hash_table_insert(IMAP_FOLDER_ITEM(item)->flags_set_table,
4299                                         GINT_TO_POINTER(flags_set), ht_data);
4300                         }
4301                         ht_data->msglist = g_slist_prepend(ht_data->msglist, GINT_TO_POINTER(msginfo->msgnum));
4302                 }
4303                 if (flags_unset) {
4304                         ht_data = g_hash_table_lookup(IMAP_FOLDER_ITEM(item)->flags_unset_table,
4305                                 GINT_TO_POINTER(flags_unset));
4306                         if (ht_data == NULL) {
4307                                 ht_data = g_new0(hashtable_data, 1);
4308                                 ht_data->item = IMAP_FOLDER_ITEM(item);
4309                                 g_hash_table_insert(IMAP_FOLDER_ITEM(item)->flags_unset_table,
4310                                         GINT_TO_POINTER(flags_unset), ht_data);
4311                         }
4312                         ht_data->msglist = g_slist_prepend(ht_data->msglist,
4313                                         GINT_TO_POINTER(msginfo->msgnum));
4314                 }
4315         } else {
4316                 debug_print("IMAP changing flags\n");
4317                 if (flags_set) {
4318                         ok = imap_set_message_flags(session, IMAP_FOLDER_ITEM(item), &numlist, flags_set, NULL, TRUE);
4319                         if (ok != MAILIMAP_NO_ERROR) {
4320                                 return;
4321                         }
4322                 }
4323
4324                 if (flags_unset) {
4325                         ok = imap_set_message_flags(session, IMAP_FOLDER_ITEM(item), &numlist, flags_unset, NULL, FALSE);
4326                         if (ok != MAILIMAP_NO_ERROR) {
4327                                 return;
4328                         }
4329                 }
4330         }
4331         msginfo->flags.perm_flags = newflags;
4332         return;
4333 }
4334
4335 static gint imap_remove_msg(Folder *folder, FolderItem *item, gint uid)
4336 {
4337         gint ok;
4338         IMAPSession *session;
4339         gchar *dir;
4340         MsgNumberList numlist;
4341
4342         g_return_val_if_fail(folder != NULL, -1);
4343         g_return_val_if_fail(FOLDER_CLASS(folder) == &imap_class, -1);
4344         g_return_val_if_fail(item != NULL, -1);
4345
4346         debug_print("getting session...\n");
4347         session = imap_session_get(folder);
4348         if (!session) return -1;
4349
4350         ok = imap_select(session, IMAP_FOLDER(folder), item,
4351                          NULL, NULL, NULL, NULL, NULL, FALSE);
4352         if (ok != MAILIMAP_NO_ERROR) {
4353                 return ok;
4354         }
4355         numlist.next = NULL;
4356         numlist.data = GINT_TO_POINTER(uid);
4357
4358         ok = imap_set_message_flags
4359                 (session, IMAP_FOLDER_ITEM(item), &numlist, IMAP_FLAG_DELETED, NULL, TRUE);
4360         if (ok != MAILIMAP_NO_ERROR) {
4361                 log_warning(LOG_PROTOCOL, _("can't set deleted flags: %d\n"), uid);
4362                 return ok;
4363         }
4364
4365         if (!session->uidplus) {
4366                 ok = imap_cmd_expunge(session);
4367         } else {
4368                 gchar *uidstr;
4369
4370                 uidstr = g_strdup_printf("%u", uid);
4371                 ok = imap_cmd_expunge(session);
4372                 g_free(uidstr);
4373         }
4374         if (ok != MAILIMAP_NO_ERROR) {
4375                 log_warning(LOG_PROTOCOL, _("can't expunge\n"));
4376                 return ok;
4377         }
4378
4379         IMAP_FOLDER_ITEM(item)->uid_list = g_slist_remove(
4380             IMAP_FOLDER_ITEM(item)->uid_list, numlist.data);
4381         dir = folder_item_get_path(item);
4382         if (is_dir_exist(dir))
4383                 remove_numbered_files(dir, uid, uid);
4384         g_free(dir);
4385         return MAILIMAP_NO_ERROR;
4386 }
4387
4388 static gint compare_msginfo(gconstpointer a, gconstpointer b)
4389 {
4390         return ((MsgInfo *)a)->msgnum - ((MsgInfo *)b)->msgnum;
4391 }
4392
4393 static guint gslist_find_next_num(MsgNumberList **list, guint num)
4394 {
4395         GSList *elem;
4396
4397         g_return_val_if_fail(list != NULL, -1);
4398
4399         for (elem = *list; elem != NULL; elem = g_slist_next(elem))
4400                 if (GPOINTER_TO_INT(elem->data) >= num)
4401                         break;
4402         *list = elem;
4403         return elem != NULL ? GPOINTER_TO_INT(elem->data) : (gint)-1;
4404 }
4405
4406 static gboolean flag_ok(IMAPFolderItem *item, guint flag)
4407 {
4408         if (item->ok_flags && g_slist_find(item->ok_flags, GUINT_TO_POINTER(flag))) {
4409                 debug_print("flag %d is OK\n", flag);
4410                 return TRUE;
4411         }
4412         if (item->can_create_flags == ITEM_CAN_CREATE_FLAGS) {
4413                 debug_print("creating flags is OK\n");
4414                 return TRUE;
4415         }
4416         return FALSE;
4417 }
4418
4419 /*
4420  * NEW and DELETED flags are not syncronized
4421  * - The NEW/RECENT flags in IMAP folders can not really be directly
4422  *   modified by Sylpheed
4423  * - The DELETE/DELETED flag in IMAP and Sylpheed don't have the same
4424  *   meaning, in IMAP it always removes the messages from the FolderItem
4425  *   in Sylpheed it can mean to move the message to trash
4426  */
4427
4428 typedef struct _get_flags_data {
4429         Folder *folder;
4430         FolderItem *item;
4431         MsgInfoList *msginfo_list;
4432         GRelation *msgflags;
4433         gboolean full_search;
4434         gboolean done;
4435 } get_flags_data;
4436
4437 static /*gint*/ void *imap_get_flags_thread(void *data)
4438 {
4439         get_flags_data *stuff = (get_flags_data *)data;
4440         Folder *folder = stuff->folder;
4441         FolderItem *fitem = (FolderItem *) stuff->item;
4442         MsgInfoList *msginfo_list = stuff->msginfo_list;
4443         GRelation *msgflags = stuff->msgflags;
4444         GSList *elem;
4445         carray * lep_uidtab;
4446         IMAPSession *session;
4447         gint ok;
4448         int r = MAILIMAP_NO_ERROR;
4449         GHashTable *flags_hash = NULL;
4450         GHashTable *tags_hash = NULL;
4451         gboolean full_search = stuff->full_search;
4452         GSList *sorted_list = NULL;
4453         GSList *unseen = NULL, *answered = NULL, *flagged = NULL, *deleted = NULL, *forwarded = NULL;
4454         GSList *seq_list, *cur;
4455         gboolean reverse_seen = FALSE;
4456         gboolean selected_folder;
4457         gint exists_cnt, unseen_cnt;
4458         gboolean got_alien_tags = FALSE;
4459
4460         session = imap_session_get(folder);
4461
4462         if (session == NULL) {
4463                 stuff->done = TRUE;
4464                 return GINT_TO_POINTER(-1);
4465         }
4466         selected_folder = (session->mbox != NULL) &&
4467                           (!strcmp(session->mbox, fitem->path));
4468
4469         lock_session(session);
4470         if (!selected_folder) {
4471                 ok = imap_select(session, IMAP_FOLDER(folder), fitem,
4472                         &exists_cnt, NULL, &unseen_cnt, NULL, NULL, TRUE);
4473                 if (ok != MAILIMAP_NO_ERROR) {
4474                         stuff->done = TRUE;
4475                         return GINT_TO_POINTER(-1);
4476                 }
4477
4478                 if (unseen_cnt > exists_cnt / 2)
4479                         reverse_seen = TRUE;
4480         }
4481         else {
4482                 if (fitem->unread_msgs > fitem->total_msgs / 2)
4483                         reverse_seen = TRUE;
4484         }
4485
4486         sorted_list = g_slist_sort(g_slist_copy(msginfo_list), compare_msginfo);
4487         if (!full_search) {
4488                 seq_list = imap_get_lep_set_from_msglist(IMAP_FOLDER(folder), msginfo_list);
4489         } else {
4490                 struct mailimap_set * set;
4491                 set = mailimap_set_new_interval(1, 0);
4492                 seq_list = g_slist_append(NULL, set);
4493         }
4494
4495         if (folder->account && folder->account->low_bandwidth) {
4496                 for (cur = seq_list; cur != NULL; cur = g_slist_next(cur)) {
4497                         struct mailimap_set * imapset;
4498                         clist * lep_uidlist;
4499                         int r;
4500
4501                         imapset = cur->data;
4502                         if (reverse_seen) {
4503                                 r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_SEEN,
4504                                                          full_search ? NULL:imapset, &lep_uidlist);
4505                         }
4506                         else {
4507                                 r = imap_threaded_search(folder,
4508                                                          IMAP_SEARCH_TYPE_UNSEEN,
4509                                                          full_search ? NULL:imapset, &lep_uidlist);
4510                         }
4511                         if (r == MAILIMAP_NO_ERROR) {
4512                                 GSList * uidlist;
4513
4514                                 uidlist = imap_uid_list_from_lep(lep_uidlist);
4515                                 mailimap_search_result_free(lep_uidlist);
4516
4517                                 unseen = g_slist_concat(unseen, uidlist);
4518                         } else {
4519                                 imap_handle_error(SESSION(session), r);
4520                                 goto bail;
4521                         }
4522
4523                         r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_FLAGGED,
4524                                                  full_search ? NULL:imapset, &lep_uidlist);
4525                         if (r == MAILIMAP_NO_ERROR) {
4526                                 GSList * uidlist;
4527
4528                                 uidlist = imap_uid_list_from_lep(lep_uidlist);
4529                                 mailimap_search_result_free(lep_uidlist);
4530
4531                                 flagged = g_slist_concat(flagged, uidlist);
4532                         } else {
4533                                 imap_handle_error(SESSION(session), r);
4534                                 goto bail;
4535                         }
4536
4537                         if (fitem->opened || fitem->processing_pending || fitem == folder->inbox) {
4538                                 r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_ANSWERED,
4539                                                          full_search ? NULL:imapset, &lep_uidlist);
4540                                 if (r == MAILIMAP_NO_ERROR) {
4541                                         GSList * uidlist;
4542
4543                                         uidlist = imap_uid_list_from_lep(lep_uidlist);
4544                                         mailimap_search_result_free(lep_uidlist);
4545
4546                                         answered = g_slist_concat(answered, uidlist);
4547                                 } else {
4548                                         imap_handle_error(SESSION(session), r);
4549                                         goto bail;
4550                                 }
4551
4552                                 if (flag_ok(IMAP_FOLDER_ITEM(fitem), IMAP_FLAG_FORWARDED)) {
4553                                         r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_FORWARDED,
4554                                                                  full_search ? NULL:imapset, &lep_uidlist);
4555                                         if (r == MAILIMAP_NO_ERROR) {
4556                                                 GSList * uidlist;
4557
4558                                                 uidlist = imap_uid_list_from_lep(lep_uidlist);
4559                                                 mailimap_search_result_free(lep_uidlist);
4560
4561                                                 forwarded = g_slist_concat(forwarded, uidlist);
4562                                         } else {
4563                                                 imap_handle_error(SESSION(session), r);
4564                                                 goto bail;
4565                                         }
4566                                 }
4567
4568                                 r = imap_threaded_search(folder, IMAP_SEARCH_TYPE_DELETED,
4569                                                          full_search ? NULL:imapset, &lep_uidlist);
4570                                 if (r == MAILIMAP_NO_ERROR) {
4571                                         GSList * uidlist;
4572
4573                                         uidlist = imap_uid_list_from_lep(lep_uidlist);
4574                                         mailimap_search_result_free(lep_uidlist);
4575
4576                                         deleted = g_slist_concat(deleted, uidlist);
4577                                 } else {
4578                                         imap_handle_error(SESSION(session), r);
4579                                         goto bail;
4580                                 }
4581                         }
4582                 }
4583
4584         } else {
4585                 r = imap_threaded_fetch_uid_flags(folder, 1, &lep_uidtab);
4586                 if (r == MAILIMAP_NO_ERROR) {
4587                         flags_hash = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, NULL);
4588                         tags_hash = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, NULL);
4589                         imap_flags_hash_from_lep_uid_flags_tab(lep_uidtab, flags_hash, tags_hash);
4590                         imap_fetch_uid_flags_list_free(lep_uidtab);
4591                 } else {
4592                         imap_handle_error(SESSION(session), r);
4593                         goto bail;
4594                 }
4595         }
4596
4597 bail:
4598         if (r == MAILIMAP_NO_ERROR)
4599                 unlock_session(session);
4600
4601         for (elem = sorted_list; elem != NULL; elem = g_slist_next(elem)) {
4602                 MsgInfo *msginfo;
4603                 MsgPermFlags flags, oldflags;
4604                 gboolean wasnew;
4605
4606                 msginfo = (MsgInfo *) elem->data;
4607                 flags = msginfo->flags.perm_flags;
4608                 wasnew = (flags & MSG_NEW);
4609                 oldflags = flags & ~(MSG_NEW|MSG_UNREAD|MSG_REPLIED|MSG_FORWARDED|MSG_MARKED|MSG_DELETED);
4610
4611                 if (folder->account && folder->account->low_bandwidth) {
4612                         if (fitem->opened || fitem->processing_pending || fitem == folder->inbox) {
4613                                 flags &= ~((reverse_seen ? 0 : MSG_UNREAD | MSG_NEW) | MSG_REPLIED | MSG_FORWARDED | MSG_MARKED);
4614                         } else {
4615                                 flags &= ~((reverse_seen ? 0 : MSG_UNREAD | MSG_NEW | MSG_MARKED));
4616                         }
4617                         if (reverse_seen)
4618                                 flags |= MSG_UNREAD | (wasnew ? MSG_NEW : 0);
4619                         if (gslist_find_next_num(&unseen, msginfo->msgnum) == msginfo->msgnum) {
4620                                 if (!reverse_seen) {
4621                                         flags |= MSG_UNREAD | (wasnew ? MSG_NEW : 0);
4622                                 } else {
4623                                         flags &= ~(MSG_UNREAD | MSG_NEW);
4624                                 }
4625                         }
4626
4627                         if (gslist_find_next_num(&flagged, msginfo->msgnum) == msginfo->msgnum)
4628                                 flags |= MSG_MARKED;
4629                         else
4630                                 flags &= ~MSG_MARKED;
4631
4632                         if (fitem->opened || fitem->processing_pending || fitem == folder->inbox) {
4633                                 if (gslist_find_next_num(&answered, msginfo->msgnum) == msginfo->msgnum)
4634                                         flags |= MSG_REPLIED;
4635                                 else
4636                                         flags &= ~MSG_REPLIED;
4637                                 if (gslist_find_next_num(&forwarded, msginfo->msgnum) == msginfo->msgnum)
4638                                         flags |= MSG_FORWARDED;
4639                                 else
4640                                         flags &= ~MSG_FORWARDED;
4641                                 if (gslist_find_next_num(&deleted, msginfo->msgnum) == msginfo->msgnum)
4642                                         flags |= MSG_DELETED;
4643                                 else
4644                                         flags &= ~MSG_DELETED;
4645                         }
4646                 } else {
4647                         if (flags_hash != NULL) {
4648
4649                                 flags = GPOINTER_TO_INT(g_hash_table_lookup(flags_hash,
4650                                                 GINT_TO_POINTER(msginfo->msgnum)));
4651                         }
4652
4653                         if ((flags & MSG_UNREAD) == 0)
4654                                 flags &= ~MSG_NEW;
4655                         else if (wasnew)
4656                                 flags |= MSG_NEW;
4657                         flags |= oldflags;
4658
4659                         if (tags_hash != NULL) {
4660                                 GSList *tags = g_hash_table_lookup(tags_hash, GINT_TO_POINTER(msginfo->msgnum));
4661                                 GSList *cur;
4662
4663                                 if (tags != NULL) {
4664                                         g_slist_free(msginfo->tags);
4665                                         msginfo->tags = NULL;
4666                                 }
4667                                 for (cur = tags; cur; cur = cur->next) {
4668                                         gchar *real_tag = imap_modified_utf7_to_utf8(cur->data, TRUE);
4669                                         gint id = 0;
4670                                         id = tags_get_id_for_str(real_tag);
4671                                         if (id == -1) {
4672                                                 id = tags_add_tag(real_tag);
4673                                                 got_alien_tags = TRUE;
4674                                         }
4675                                         if (!g_slist_find(msginfo->tags, GINT_TO_POINTER(id))) {
4676                                                 msginfo->tags = g_slist_append(
4677                                                                 msginfo->tags,
4678                                                                 GINT_TO_POINTER(id));
4679                                         }
4680                                         g_free(real_tag);
4681                                 }
4682                                 slist_free_strings(tags);
4683                                 g_slist_free(tags);
4684                         }
4685                 }
4686
4687                 g_relation_insert(msgflags, msginfo, GINT_TO_POINTER(flags));
4688         }
4689
4690         if (got_alien_tags) {
4691                 tags_write_tags();
4692                 main_window_reflect_tags_changes(mainwindow_get_mainwindow());
4693         }
4694
4695         if (flags_hash)
4696                 g_hash_table_destroy(flags_hash);
4697         if (tags_hash)
4698                 g_hash_table_destroy(tags_hash);
4699
4700         imap_lep_set_free(seq_list);
4701         g_slist_free(flagged);
4702         g_slist_free(deleted);
4703         g_slist_free(answered);
4704         g_slist_free(forwarded);
4705         g_slist_free(unseen);
4706         g_slist_free(sorted_list);
4707
4708         stuff->done = TRUE;
4709         return GINT_TO_POINTER(0);
4710 }
4711
4712 static gint imap_get_flags(Folder *folder, FolderItem *item,
4713                            MsgInfoList *msginfo_list, GRelation *msgflags)
4714 {
4715         gint result;
4716         get_flags_data *data = g_new0(get_flags_data, 1);
4717         data->done = FALSE;
4718         data->folder = folder;
4719         data->item = item;
4720         data->msginfo_list = msginfo_list;
4721         data->msgflags = msgflags;
4722         data->full_search = FALSE;
4723
4724         GSList *tmp = NULL, *cur;
4725
4726         if (prefs_common.work_offline &&
4727             !inc_offline_should_override(FALSE,
4728                 _("Claws Mail needs network access in order "
4729                   "to access the IMAP server."))) {
4730                 g_free(data);
4731                 return -1;
4732         }
4733
4734         tmp = folder_item_get_msg_list(item);
4735
4736         if (g_slist_length(tmp) <= g_slist_length(msginfo_list))
4737                 data->full_search = TRUE;
4738
4739         for (cur = tmp; cur; cur = cur->next)
4740                 procmsg_msginfo_free((MsgInfo *)cur->data);
4741
4742         g_slist_free(tmp);
4743
4744         result = GPOINTER_TO_INT(imap_get_flags_thread(data));
4745
4746         g_free(data);
4747         return result;
4748
4749 }
4750
4751 static gboolean process_flags(gpointer key, gpointer value, gpointer user_data)
4752 {
4753         gboolean flags_set = GPOINTER_TO_INT(user_data);
4754         gint flags_value = GPOINTER_TO_INT(key);
4755         hashtable_data *data = (hashtable_data *)value;
4756         IMAPFolderItem *_item = data->item;
4757         FolderItem *item = (FolderItem *)_item;
4758         gint ok = MAILIMAP_ERROR_BAD_STATE;
4759         IMAPSession *session = NULL;
4760
4761         debug_print("getting session...\n");
4762         session = imap_session_get(item->folder);
4763
4764         data->msglist = g_slist_reverse(data->msglist);
4765
4766         debug_print("IMAP %ssetting flags to %d for %d messages\n",
4767                 flags_set?"":"un",
4768                 flags_value,
4769                 g_slist_length(data->msglist));
4770
4771         lock_session(session);
4772         if (session) {
4773                 ok = imap_select(session, IMAP_FOLDER(item->folder), item,
4774                          NULL, NULL, NULL, NULL, NULL, FALSE);
4775         }
4776         if (ok == MAILIMAP_NO_ERROR) {
4777                 ok = imap_set_message_flags(session, IMAP_FOLDER_ITEM(item),
4778                         data->msglist, flags_value, NULL, flags_set);
4779         } else {
4780                 g_warning("can't select mailbox %s\n", item->path);
4781         }
4782
4783         if (!is_fatal(ok))
4784                 unlock_session(session);
4785
4786         g_slist_free(data->msglist);
4787         g_free(data);
4788         return TRUE;
4789 }
4790
4791 static gboolean process_tags(gpointer key, gpointer value, gpointer user_data)
4792 {
4793         gboolean tags_set = GPOINTER_TO_INT(user_data);
4794         TagsData *data = (TagsData *)value;
4795         IMAPFolderItem *_item = data->item;
4796         FolderItem *item = (FolderItem *)_item;
4797         gchar *str = data->str;
4798         gint ok = MAILIMAP_ERROR_BAD_STATE;
4799         IMAPSession *session = NULL;
4800
4801         debug_print("getting session...\n");
4802         session = imap_session_get(item->folder);
4803
4804         data->msglist = g_slist_reverse(data->msglist);
4805
4806         debug_print("IMAP %ssetting tags %s for %d messages\n",
4807                 tags_set?"":"un",
4808                 str,
4809                 g_slist_length(data->msglist));
4810
4811         lock_session(session);
4812         if (session) {
4813                 ok = imap_select(session, IMAP_FOLDER(item->folder), item,
4814                          NULL, NULL, NULL, NULL, NULL, FALSE);
4815         }
4816         if (ok == MAILIMAP_NO_ERROR) {
4817                 GSList list;
4818                 list.data = str;
4819                 list.next = NULL;
4820                 ok = imap_set_message_flags(session, IMAP_FOLDER_ITEM(item),
4821                         data->msglist, 0, &list, tags_set);
4822         } else {
4823                 g_warning("can't select mailbox %s\n", item->path);
4824         }
4825
4826         if (!is_fatal(ok))
4827                 unlock_session(session);
4828
4829         g_slist_free(data->msglist);
4830         g_free(data->str);
4831         g_free(data);
4832         return TRUE;
4833 }
4834
4835 static void process_hashtable(IMAPFolderItem *item)
4836 {
4837         if (item->flags_set_table) {
4838                 g_hash_table_foreach_remove(item->flags_set_table, process_flags, GINT_TO_POINTER(TRUE));
4839                 g_hash_table_destroy(item->flags_set_table);
4840                 item->flags_set_table = NULL;
4841         }
4842         if (item->flags_unset_table) {
4843                 g_hash_table_foreach_remove(item->flags_unset_table, process_flags, GINT_TO_POINTER(FALSE));
4844                 g_hash_table_destroy(item->flags_unset_table);
4845                 item->flags_unset_table = NULL;
4846         }
4847         if (item->tags_set_table) {
4848                 g_hash_table_foreach_remove(item->tags_set_table, process_tags, GINT_TO_POINTER(TRUE));
4849                 g_hash_table_destroy(item->tags_set_table);
4850                 item->tags_set_table = NULL;
4851         }
4852         if (item->tags_unset_table) {
4853                 g_hash_table_foreach_remove(item->tags_unset_table, process_tags, GINT_TO_POINTER(FALSE));
4854                 g_hash_table_destroy(item->tags_unset_table);
4855                 item->tags_unset_table = NULL;
4856         }
4857
4858 }
4859
4860 static void imap_set_batch (Folder *folder, FolderItem *_item, gboolean batch)
4861 {
4862         IMAPFolderItem *item = (IMAPFolderItem *)_item;
4863         IMAPSession *session;
4864
4865         g_return_if_fail(item != NULL);
4866
4867         if (item->batching == batch)
4868                 return;
4869
4870         if (batch) {
4871                 item->batching = TRUE;
4872                 debug_print("IMAP switching to batch mode\n");
4873                 if (!item->flags_set_table) {
4874                         item->flags_set_table = g_hash_table_new(NULL, g_direct_equal);
4875                 }
4876                 if (!item->flags_unset_table) {
4877                         item->flags_unset_table = g_hash_table_new(NULL, g_direct_equal);
4878                 }
4879                 if (!item->tags_set_table) {
4880                         item->tags_set_table = g_hash_table_new(NULL, g_direct_equal);
4881                 }
4882                 if (!item->tags_unset_table) {
4883                         item->tags_unset_table = g_hash_table_new(NULL, g_direct_equal);
4884                 }
4885                 session = imap_session_get(folder);
4886                 if (session) {
4887                         imap_refresh_sensitivity(session);
4888                         session->sens_update_block = TRUE;
4889                 }
4890         } else {
4891                 debug_print("IMAP switching away from batch mode\n");
4892                 /* process stuff */
4893                 process_hashtable(item);
4894                 item->batching = FALSE;
4895                 session = imap_session_get(folder);
4896                 if (session) {
4897                         session->sens_update_block = FALSE;
4898                         imap_refresh_sensitivity(session);
4899                 }
4900         }
4901 }
4902
4903
4904
4905 /* data types conversion libetpan <-> claws */
4906
4907
4908
4909 #define ETPAN_IMAP_MB_MARKED      1
4910 #define ETPAN_IMAP_MB_UNMARKED    2
4911 #define ETPAN_IMAP_MB_NOSELECT    4
4912 #define ETPAN_IMAP_MB_NOINFERIORS 8
4913
4914 static int imap_flags_to_flags(struct mailimap_mbx_list_flags * imap_flags)
4915 {
4916   int flags;
4917   clistiter * cur;
4918
4919   flags = 0;
4920   if (imap_flags->mbf_type == MAILIMAP_MBX_LIST_FLAGS_SFLAG) {
4921     switch (imap_flags->mbf_sflag) {
4922     case MAILIMAP_MBX_LIST_SFLAG_MARKED:
4923       flags |= ETPAN_IMAP_MB_MARKED;
4924       break;
4925     case MAILIMAP_MBX_LIST_SFLAG_NOSELECT:
4926       flags |= ETPAN_IMAP_MB_NOSELECT;
4927       break;
4928     case MAILIMAP_MBX_LIST_SFLAG_UNMARKED:
4929       flags |= ETPAN_IMAP_MB_UNMARKED;
4930       break;
4931     }
4932   }
4933
4934   for(cur = clist_begin(imap_flags->mbf_oflags) ; cur != NULL ;
4935       cur = clist_next(cur)) {
4936     struct mailimap_mbx_list_oflag * oflag;
4937
4938     oflag = clist_content(cur);
4939
4940     switch (oflag->of_type) {
4941     case MAILIMAP_MBX_LIST_OFLAG_NOINFERIORS:
4942       flags |= ETPAN_IMAP_MB_NOINFERIORS;
4943       break;
4944     }
4945   }
4946
4947   return flags;
4948 }
4949
4950 static GSList * imap_list_from_lep(IMAPFolder * folder,
4951                                    clist * list, const gchar * real_path, gboolean all)
4952 {
4953         clistiter * iter;
4954         GSList * item_list = NULL, *llast = NULL;
4955
4956         for(iter = clist_begin(list) ; iter != NULL ;
4957             iter = clist_next(iter)) {
4958                 struct mailimap_mailbox_list * mb;
4959                 int flags;
4960                 char delimiter;
4961                 char * name;
4962                 char * dup_name;
4963                 gchar * base;
4964                 gchar * loc_name;
4965                 gchar * loc_path;
4966                 FolderItem *new_item;
4967
4968                 mb = clist_content(iter);
4969
4970                 if (mb == NULL)
4971                         continue;
4972
4973                 flags = 0;
4974                 if (mb->mb_flag != NULL)
4975                         flags = imap_flags_to_flags(mb->mb_flag);
4976
4977                 delimiter = mb->mb_delimiter;
4978                 name = mb->mb_name;
4979
4980                 dup_name = strdup(name);
4981                 if (delimiter != '\0')
4982                         subst_char(dup_name, delimiter, '/');
4983
4984                 base = g_path_get_basename(dup_name);
4985                 if (base[0] == '.') {
4986                         g_free(base);
4987                         free(dup_name);
4988                         continue;
4989                 }
4990                 if (!all && path_cmp(name, real_path) == 0) {
4991                         g_free(base);
4992                         free(dup_name);
4993                         continue;
4994                 }
4995
4996                 if (!all && dup_name[strlen(dup_name)-1] == '/') {
4997                         dup_name[strlen(dup_name)-1] = '\0';
4998                 }
4999
5000                 loc_name = imap_modified_utf7_to_utf8(base, FALSE);
5001                 loc_path = imap_modified_utf7_to_utf8(dup_name, FALSE);
5002
5003                 new_item = folder_item_new(FOLDER(folder), loc_name, loc_path);
5004                 if ((flags & ETPAN_IMAP_MB_NOINFERIORS) != 0)
5005                         new_item->no_sub = TRUE;
5006                 if (strcmp(dup_name, "INBOX") != 0 &&
5007                     ((flags & ETPAN_IMAP_MB_NOSELECT) != 0))
5008                         new_item->no_select = TRUE;
5009
5010                 if (item_list == NULL)
5011                         llast = item_list = g_slist_append(item_list, new_item);
5012                 else {
5013                         llast = g_slist_append(llast, new_item);
5014                         llast = llast->next;
5015                 }
5016                 debug_print("folder '%s' found.\n", loc_path);
5017                 g_free(base);
5018                 g_free(loc_path);
5019                 g_free(loc_name);
5020
5021                 free(dup_name);
5022         }
5023
5024         return item_list;
5025 }
5026
5027 static GSList * imap_get_lep_set_from_numlist(IMAPFolder *folder, MsgNumberList *numlist)
5028 {
5029         GSList *sorted_list, *cur;
5030         guint first, last, next;
5031         GSList *ret_list = NULL, *llast = NULL;
5032         struct mailimap_set * current_set;
5033         unsigned int item_count;
5034
5035         if (numlist == NULL)
5036                 return NULL;
5037
5038         current_set = mailimap_set_new_empty();
5039
5040         sorted_list = g_slist_copy(numlist);
5041         sorted_list = g_slist_sort(sorted_list, g_int_compare);
5042
5043         first = GPOINTER_TO_INT(sorted_list->data);
5044
5045         item_count = 0;
5046         for (cur = sorted_list; cur != NULL; cur = g_slist_next(cur)) {
5047                 if (GPOINTER_TO_INT(cur->data) == 0)
5048                         continue;
5049
5050                 item_count ++;
5051
5052                 last = GPOINTER_TO_INT(cur->data);
5053                 if (cur->next)
5054                         next = GPOINTER_TO_INT(cur->next->data);
5055                 else
5056                         next = 0;
5057
5058                 if (last + 1 != next || next == 0 || item_count >= folder->max_set_size) {
5059
5060                         struct mailimap_set_item * item;
5061                         item = mailimap_set_item_new(first, last);
5062                         mailimap_set_add(current_set, item);
5063
5064                         first = next;
5065
5066                         if (item_count >= folder->max_set_size) {
5067                                 if (ret_list == NULL)
5068                                         llast = ret_list = g_slist_append(ret_list,
5069                                                           current_set);
5070                                 else {
5071                                         llast = g_slist_append(llast, current_set);
5072                                         llast = llast->next;
5073                                 }
5074
5075                                 current_set = mailimap_set_new_empty();
5076                                 item_count = 0;
5077                         }
5078                 }
5079         }
5080
5081         if (clist_count(current_set->set_list) > 0) {
5082                 ret_list = g_slist_append(ret_list,
5083                                           current_set);
5084         }
5085
5086         g_slist_free(sorted_list);
5087
5088         return ret_list;
5089 }
5090
5091 static GSList * imap_get_lep_set_from_msglist(IMAPFolder *folder, MsgInfoList *msglist)
5092 {
5093         MsgNumberList *numlist = NULL;
5094         MsgInfoList *cur;
5095         GSList *seq_list;
5096
5097         for (cur = msglist; cur != NULL; cur = g_slist_next(cur)) {
5098                 MsgInfo *msginfo = (MsgInfo *) cur->data;
5099
5100                 numlist = g_slist_prepend(numlist, GINT_TO_POINTER(msginfo->msgnum));
5101         }
5102         numlist = g_slist_reverse(numlist);
5103         seq_list = imap_get_lep_set_from_numlist(folder, numlist);
5104         g_slist_free(numlist);
5105
5106         return seq_list;
5107 }
5108
5109 static GSList * imap_uid_list_from_lep(clist * list)
5110 {
5111         clistiter * iter;
5112         GSList * result;
5113
5114         result = NULL;
5115
5116         for(iter = clist_begin(list) ; iter != NULL ;
5117             iter = clist_next(iter)) {
5118                 uint32_t * puid;
5119
5120                 puid = clist_content(iter);
5121                 result = g_slist_prepend(result, GINT_TO_POINTER(* puid));
5122         }
5123
5124         result = g_slist_reverse(result);
5125         return result;
5126 }
5127
5128 static GSList * imap_uid_list_from_lep_tab(carray * list)
5129 {
5130         unsigned int i;
5131         GSList * result;
5132
5133         result = NULL;
5134
5135         for(i = 0 ; i < carray_count(list) ; i ++) {
5136                 uint32_t * puid;
5137
5138                 puid = carray_get(list, i);
5139                 result = g_slist_prepend(result, GINT_TO_POINTER(* puid));
5140         }
5141         result = g_slist_reverse(result);
5142         return result;
5143 }
5144
5145 static void imap_flags_hash_from_lep_uid_flags_tab(carray * list,
5146                                                    GHashTable * hash,
5147                                                    GHashTable * tags_hash)
5148 {
5149         unsigned int i;
5150         GSList * result;
5151
5152         result = NULL;
5153
5154         for(i = 0 ; i < carray_count(list) ; i += 3) {
5155                 uint32_t * puid;
5156                 int * pflags;
5157                 GSList *tags;
5158
5159                 puid = carray_get(list, i);
5160                 pflags = carray_get(list, i + 1);
5161                 tags = carray_get(list, i + 2);
5162
5163                 g_hash_table_insert(hash, GINT_TO_POINTER(*puid), GINT_TO_POINTER(* pflags));
5164                 g_hash_table_insert(tags_hash, GINT_TO_POINTER(*puid), tags);
5165         }
5166 }
5167
5168 static MsgInfo *imap_envelope_from_lep(struct imap_fetch_env_info * info,
5169                                        FolderItem *item)
5170 {
5171         MsgInfo *msginfo = NULL;
5172         guint32 uid = 0;
5173         goffset size = 0;
5174         MsgFlags flags = {0, 0};
5175
5176         if (info->headers == NULL)
5177                 return NULL;
5178
5179         MSG_SET_TMP_FLAGS(flags, MSG_IMAP);
5180         if (folder_has_parent_of_type(item, F_QUEUE)) {
5181                 MSG_SET_TMP_FLAGS(flags, MSG_QUEUED);
5182         } else if (folder_has_parent_of_type(item, F_DRAFT)) {
5183                 MSG_SET_TMP_FLAGS(flags, MSG_DRAFT);
5184         }
5185         flags.perm_flags = info->flags;
5186
5187         uid = info->uid;
5188         size = (goffset) info->size;
5189         msginfo = procheader_parse_str(info->headers, flags, FALSE, FALSE);
5190
5191         if (msginfo) {
5192                 msginfo->msgnum = uid;
5193                 msginfo->size = size;
5194         }
5195
5196         return msginfo;
5197 }
5198
5199 static void imap_lep_set_free(GSList *seq_list)
5200 {
5201         GSList * cur;
5202
5203         for(cur = seq_list ; cur != NULL ; cur = g_slist_next(cur)) {
5204                 struct mailimap_set * imapset;
5205
5206                 imapset = cur->data;
5207                 mailimap_set_free(imapset);
5208         }
5209         g_slist_free(seq_list);
5210 }
5211
5212 static struct mailimap_flag_list * imap_flag_to_lep(IMAPFolderItem *item, IMAPFlags flags, GSList *tags)
5213 {
5214         struct mailimap_flag_list * flag_list;
5215         GSList *cur = tags;
5216
5217         flag_list = mailimap_flag_list_new_empty();
5218
5219         if (IMAP_IS_SEEN(flags))
5220                 mailimap_flag_list_add(flag_list,
5221                                        mailimap_flag_new_seen());
5222         if (IMAP_IS_ANSWERED(flags))
5223                 mailimap_flag_list_add(flag_list,
5224                                        mailimap_flag_new_answered());
5225         if (IMAP_IS_FLAGGED(flags))
5226                 mailimap_flag_list_add(flag_list,
5227                                        mailimap_flag_new_flagged());
5228         if (IMAP_IS_DELETED(flags))
5229                 mailimap_flag_list_add(flag_list,
5230                                        mailimap_flag_new_deleted());
5231         if (IMAP_IS_DRAFT(flags))
5232                 mailimap_flag_list_add(flag_list,
5233                                        mailimap_flag_new_draft());
5234         if (IMAP_IS_FORWARDED(flags) && flag_ok(item, IMAP_FLAG_FORWARDED))
5235                 mailimap_flag_list_add(flag_list,
5236                                        mailimap_flag_new_flag_keyword(strdup("$Forwarded")));
5237
5238         for (; cur; cur = cur->next) {
5239                 gchar *enc_str =
5240                         imap_utf8_to_modified_utf7(cur->data, TRUE);
5241                 g_strstrip(enc_str);
5242
5243                 mailimap_flag_list_add(flag_list,
5244                         mailimap_flag_new_flag_keyword(enc_str));
5245         }
5246
5247         return flag_list;
5248 }
5249
5250 guint imap_folder_get_refcnt(Folder *folder)
5251 {
5252         return ((IMAPFolder *)folder)->refcnt;
5253 }
5254
5255 void imap_folder_ref(Folder *folder)
5256 {
5257         ((IMAPFolder *)folder)->refcnt++;
5258 }
5259
5260 void imap_disconnect_all(void)
5261 {
5262         GList *list;
5263         gboolean short_timeout;
5264 #ifdef HAVE_NETWORKMANAGER_SUPPORT
5265         GError *error;
5266 #endif
5267
5268 #ifdef HAVE_NETWORKMANAGER_SUPPORT
5269         error = NULL;
5270         short_timeout = !networkmanager_is_online(&error);
5271         if(error) {
5272                 short_timeout = TRUE;
5273                 g_error_free(error);
5274         }
5275 #else
5276         short_timeout = TRUE;
5277 #endif
5278
5279         if(short_timeout)
5280                 imap_main_set_timeout(1);
5281
5282         for (list = account_get_list(); list != NULL; list = list->next) {
5283                 PrefsAccount *account = list->data;
5284                 if (account->protocol == A_IMAP4) {
5285                         RemoteFolder *folder = (RemoteFolder *)account->folder;
5286                         if (folder && folder->session) {
5287                                 IMAPSession *session = (IMAPSession *)folder->session;
5288                                 imap_threaded_disconnect(FOLDER(folder));
5289                                 SESSION(session)->state = SESSION_DISCONNECTED;
5290                                 SESSION(session)->sock = NULL;
5291                                 session_destroy(SESSION(session));
5292                                 folder->session = NULL;
5293                         }
5294                 }
5295         }
5296
5297         if(short_timeout)
5298                 imap_main_set_timeout(prefs_common.io_timeout_secs);
5299 }
5300
5301 void imap_folder_unref(Folder *folder)
5302 {
5303         if (((IMAPFolder *)folder)->refcnt > 0)
5304                 ((IMAPFolder *)folder)->refcnt--;
5305 }
5306
5307 void imap_cancel_all(void)
5308 {
5309         GList *folderlist;
5310         GList *cur;
5311
5312         folderlist = folder_get_list();
5313         for (cur = folderlist; cur != NULL; cur = g_list_next(cur)) {
5314                 Folder *folder = (Folder *) cur->data;
5315
5316                 if (folder->klass == &imap_class) {
5317                         if (imap_is_busy(folder)) {
5318                                 IMAPSession *imap_session;
5319                                 RemoteFolder *rfolder;
5320
5321                                 g_printerr("cancelled\n");
5322                                 imap_threaded_cancel(folder);
5323                                 rfolder = (RemoteFolder *) folder;
5324                                 imap_session = (IMAPSession *) rfolder->session;
5325                                 if (imap_session)
5326                                         imap_session->cancelled = 1;
5327                         }
5328                 }
5329         }
5330 }
5331
5332 gboolean imap_cancel_all_enabled(void)
5333 {
5334         GList *folderlist;
5335         GList *cur;
5336
5337         folderlist = folder_get_list();
5338         for (cur = folderlist; cur != NULL; cur = g_list_next(cur)) {
5339                 Folder *folder = (Folder *) cur->data;
5340
5341                 if (folder->klass == &imap_class) {
5342                         if (imap_is_busy(folder)) {
5343                                 return TRUE;
5344                         }
5345                 }
5346         }
5347
5348         return FALSE;
5349 }
5350
5351 static gboolean imap_is_busy(Folder *folder)
5352 {
5353         IMAPSession *imap_session;
5354         RemoteFolder *rfolder;
5355
5356         rfolder = (RemoteFolder *) folder;
5357         imap_session = (IMAPSession *) rfolder->session;
5358         if (imap_session == NULL)
5359                 return FALSE;
5360
5361         return imap_session->busy;
5362 }
5363
5364 #else /* HAVE_LIBETPAN */
5365
5366 static FolderClass imap_class;
5367
5368 static XMLTag *imap_item_get_xml(Folder *folder, FolderItem *item);
5369 static void imap_item_set_xml(Folder *folder, FolderItem *item, XMLTag *tag);
5370
5371 static Folder   *imap_folder_new        (const gchar    *name,
5372                                          const gchar    *path)
5373 {
5374         static gboolean missing_imap_warning = TRUE;
5375         if (missing_imap_warning) {
5376                 missing_imap_warning = FALSE;
5377                 alertpanel_error(
5378                         _("You have one or more IMAP accounts "
5379                           "defined. However this version of "
5380                           "Claws Mail has been built without "
5381                           "IMAP support; your IMAP account(s) are "
5382                           "disabled.\n\n"
5383                           "You probably need to "
5384                           "install libetpan and recompile "
5385                           "Claws Mail."));
5386         }
5387         return NULL;
5388 }
5389 static gint     imap_create_tree        (Folder         *folder)
5390 {
5391         return -1;
5392 }
5393 static FolderItem *imap_create_folder   (Folder         *folder,
5394                                          FolderItem     *parent,
5395                                          const gchar    *name)
5396 {
5397         return NULL;
5398 }
5399 static gint     imap_rename_folder      (Folder         *folder,
5400                                          FolderItem     *item,
5401                                          const gchar    *name)
5402 {
5403         return -1;
5404 }
5405
5406 gchar imap_get_path_separator_for_item(FolderItem *item)
5407 {
5408         return '/';
5409 }
5410
5411 FolderClass *imap_get_class(void)
5412 {
5413         if (imap_class.idstr == NULL) {
5414                 imap_class.type = F_IMAP;
5415                 imap_class.idstr = "imap";
5416                 imap_class.uistr = "IMAP4";
5417
5418                 imap_class.new_folder = imap_folder_new;
5419                 imap_class.create_tree = imap_create_tree;
5420                 imap_class.create_folder = imap_create_folder;
5421                 imap_class.rename_folder = imap_rename_folder;
5422
5423                 imap_class.set_xml = folder_set_xml;
5424                 imap_class.get_xml = folder_get_xml;
5425                 imap_class.item_set_xml = imap_item_set_xml;
5426                 imap_class.item_get_xml = imap_item_get_xml;
5427                 /* nothing implemented */
5428         }
5429
5430         return &imap_class;
5431 }
5432
5433 void imap_disconnect_all(void)
5434 {
5435 }
5436
5437 gint imap_subscribe(Folder *folder, FolderItem *item, gchar *rpath, gboolean sub)
5438 {
5439         return -1;
5440 }
5441
5442 GList * imap_scan_subtree(Folder *folder, FolderItem *item, gboolean unsubs_only, gboolean recursive)
5443 {
5444         return NULL;
5445 }
5446
5447 void imap_cache_msg(FolderItem *item, gint msgnum)
5448 {
5449 }
5450
5451 void imap_cancel_all(void)
5452 {
5453 }
5454
5455 gboolean imap_cancel_all_enabled(void)
5456 {
5457         return FALSE;
5458 }
5459
5460 #endif
5461
5462 #ifdef HAVE_LIBETPAN
5463 static void imap_synchronise(FolderItem *item, gint days)
5464 {
5465         if (IMAP_FOLDER_ITEM(item)->last_sync == IMAP_FOLDER_ITEM(item)->last_change) {
5466                 debug_print("%s already synced\n", item->path?item->path:item->name);
5467                 return;
5468         }
5469         debug_print("syncing %s\n", item->path?item->path:item->name);
5470         imap_gtk_synchronise(item, days);
5471         IMAP_FOLDER_ITEM(item)->last_sync = IMAP_FOLDER_ITEM(item)->last_change;
5472 }
5473 #endif
5474
5475 static void imap_item_set_xml(Folder *folder, FolderItem *item, XMLTag *tag)
5476 {
5477 #ifdef HAVE_LIBETPAN
5478         GList *cur;
5479 #endif
5480         folder_item_set_xml(folder, item, tag);
5481
5482 #ifdef HAVE_LIBETPAN
5483         for (cur = tag->attr; cur != NULL; cur = g_list_next(cur)) {
5484                 XMLAttr *attr = (XMLAttr *) cur->data;
5485
5486                 if (!attr || !attr->name || !attr->value) continue;
5487                 if (!strcmp(attr->name, "uidnext"))
5488                         IMAP_FOLDER_ITEM(item)->uid_next = atoi(attr->value);
5489                 if (!strcmp(attr->name, "last_sync"))
5490                         IMAP_FOLDER_ITEM(item)->last_sync = atoi(attr->value);
5491                 if (!strcmp(attr->name, "last_change"))
5492                         IMAP_FOLDER_ITEM(item)->last_change = atoi(attr->value);
5493         }
5494         if (IMAP_FOLDER_ITEM(item)->last_change == 0)
5495                 IMAP_FOLDER_ITEM(item)->last_change = time(NULL);
5496 #endif
5497 }
5498
5499 static XMLTag *imap_item_get_xml(Folder *folder, FolderItem *item)
5500 {
5501         XMLTag *tag;
5502
5503         tag = folder_item_get_xml(folder, item);
5504
5505 #ifdef HAVE_LIBETPAN
5506         xml_tag_add_attr(tag, xml_attr_new_int("uidnext",
5507                         IMAP_FOLDER_ITEM(item)->uid_next));
5508         xml_tag_add_attr(tag, xml_attr_new_int("last_sync",
5509                         IMAP_FOLDER_ITEM(item)->last_sync));
5510         xml_tag_add_attr(tag, xml_attr_new_int("last_change",
5511                         IMAP_FOLDER_ITEM(item)->last_change));
5512
5513 #endif
5514         return tag;
5515 }
5516
5517 /* ===================================================================
5518  * UTF-7 conversion routines as in RFC 2192
5519  * ===================================================================
5520  * These two functions from:
5521  * libimap library.
5522  * Copyright (C) 2003-2004 Pawel Salek. */
5523
5524 /* UTF7 modified base64 alphabet */
5525 static char base64chars[] =
5526   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
5527 #define UNDEFINED 64
5528
5529 /* UTF16 definitions */
5530 #define UTF16MASK       0x03FFUL
5531 #define UTF16SHIFT      10
5532 #define UTF16BASE       0x10000UL
5533 #define UTF16HIGHSTART  0xD800UL
5534 #define UTF16HIGHEND    0xDBFFUL
5535 #define UTF16LOSTART    0xDC00UL
5536 #define UTF16LOEND      0xDFFFUL
5537
5538
5539 /* Convert an IMAP mailbox to a UTF-8 string.
5540  *  dst needs to have roughly 4 times the storage space of src
5541  *    Hex encoding can triple the size of the input
5542  *    UTF-7 can be slightly denser than UTF-8
5543  *     (worst case: 8 octets UTF-7 becomes 9 octets UTF-8)
5544  */
5545 char* imap_modified_utf7_to_utf8(const char *mbox, gboolean change_spaces)
5546 {
5547   unsigned c, i, bitcount;
5548   unsigned long ucs4, utf16, bitbuf;
5549   unsigned char base64[256];
5550   const char *src;
5551   char *dst, *res  = malloc(2*strlen(mbox)+1);
5552
5553   bitbuf = 0;
5554   dst = res;
5555   src = mbox;
5556   if(!dst) return NULL;
5557   /* initialize modified base64 decoding table */
5558   memset(base64, UNDEFINED, sizeof (base64));
5559   for (i = 0; i < sizeof (base64chars); ++i) {
5560     base64[(unsigned)base64chars[i]] = i;
5561   }
5562
5563   /* loop until end of string */
5564   while (*src != '\0') {
5565     c = *src++;
5566     /* deal with literal characters and &- */
5567     if (c != '&' || *src == '-') {
5568       /* encode literally */
5569       if (change_spaces && c == '_')
5570         *dst++ = ' ';
5571       else
5572         *dst++ = c;
5573       /* skip over the '-' if this is an &- sequence */
5574       if (c == '&') ++src;
5575     } else {
5576       /* convert modified UTF-7 -> UTF-16 -> UCS-4 -> UTF-8 -> HEX */
5577       bitbuf = 0;
5578       bitcount = 0;
5579       ucs4 = 0;
5580       while ((c = base64[(unsigned char) *src]) != UNDEFINED) {
5581         ++src;
5582         bitbuf = (bitbuf << 6) | c;
5583         bitcount += 6;
5584         /* enough bits for a UTF-16 character? */
5585         if (bitcount >= 16) {
5586           bitcount -= 16;
5587           utf16 = (bitcount ? bitbuf >> bitcount
5588                    : bitbuf) & 0xffff;
5589           /* convert UTF16 to UCS4 */
5590           if
5591             (utf16 >= UTF16HIGHSTART && utf16 <= UTF16HIGHEND) {
5592             ucs4 = (utf16 - UTF16HIGHSTART) << UTF16SHIFT;
5593             continue;
5594           } else if
5595             (utf16 >= UTF16LOSTART && utf16 <= UTF16LOEND) {
5596             ucs4 += utf16 - UTF16LOSTART + UTF16BASE;
5597           } else {
5598             ucs4 = utf16;
5599           }
5600
5601           /* convert UTF-16 range of UCS4 to UTF-8 */
5602           if (ucs4 <= 0x7fUL) {
5603             dst[0] = ucs4;
5604             dst += 1;
5605           } else if (ucs4 <= 0x7ffUL) {
5606             dst[0] = 0xc0 | (ucs4 >> 6);
5607             dst[1] = 0x80 | (ucs4 & 0x3f);
5608             dst += 2;
5609           } else if (ucs4 <= 0xffffUL) {
5610             dst[0] = 0xe0 | (ucs4 >> 12);
5611             dst[1] = 0x80 | ((ucs4 >> 6) & 0x3f);
5612             dst[2] = 0x80 | (ucs4 & 0x3f);
5613             dst += 3;
5614           } else {
5615             dst[0] = 0xf0 | (ucs4 >> 18);
5616             dst[1] = 0x80 | ((ucs4 >> 12) & 0x3f);
5617             dst[2] = 0x80 | ((ucs4 >> 6) & 0x3f);
5618             dst[3] = 0x80 | (ucs4 & 0x3f);
5619             dst += 4;
5620           }
5621         }
5622       }
5623       /* skip over trailing '-' in modified UTF-7 encoding */
5624       if (*src == '-') ++src;
5625     }
5626   }
5627   /* terminate destination string */
5628   *dst = '\0';
5629   return res;
5630 }
5631
5632 /* Convert hex coded UTF-8 string to modified UTF-7 IMAP mailbox
5633  *  dst should be about twice the length of src to deal with non-hex
5634  *  coded URLs
5635  */
5636 char* imap_utf8_to_modified_utf7(const char *src, gboolean change_spaces)
5637 {
5638   unsigned int utf8pos, utf8total, c, utf7mode, bitstogo, utf16flag;
5639   unsigned long ucs4 = 0, bitbuf = 0;
5640
5641   /* initialize hex lookup table */
5642   char *dst, *res = malloc(2*strlen(src)+1);
5643   dst = res;
5644   if(!dst) return NULL;
5645
5646   utf7mode = 0;
5647   utf8total = 0;
5648   bitstogo = 0;
5649   utf8pos = 0;
5650   while ((c = (unsigned char)*src) != '\0') {
5651     ++src;
5652     /* normal character? */
5653     if (c >= ' ' && c <= '~' && (c != '_' || !change_spaces)) {
5654       /* switch out of UTF-7 mode */
5655       if (utf7mode) {
5656         if (bitstogo) {
5657           *dst++ = base64chars[(bitbuf << (6 - bitstogo)) & 0x3F];
5658         }
5659         *dst++ = '-';
5660         utf7mode = 0;
5661         utf8pos  = 0;
5662         bitstogo = 0;
5663         utf8total= 0;
5664       }
5665       if (change_spaces && c == ' ')
5666         *dst++ = '_';
5667       else
5668         *dst++ = c;
5669       /* encode '&' as '&-' */
5670       if (c == '&') {
5671         *dst++ = '-';
5672       }
5673       continue;
5674     }
5675     /* switch to UTF-7 mode */
5676     if (!utf7mode) {
5677       *dst++ = '&';
5678       utf7mode = 1;
5679     }
5680     /* Encode US-ASCII characters as themselves */
5681     if (c < 0x80) {
5682       ucs4 = c;
5683       utf8total = 1;
5684     } else if (utf8total) {
5685       /* save UTF8 bits into UCS4 */
5686       ucs4 = (ucs4 << 6) | (c & 0x3FUL);
5687       if (++utf8pos < utf8total) {
5688         continue;
5689       }
5690     } else {
5691       utf8pos = 1;
5692       if (c < 0xE0) {
5693         utf8total = 2;
5694         ucs4 = c & 0x1F;
5695       } else if (c < 0xF0) {
5696         utf8total = 3;
5697         ucs4 = c & 0x0F;
5698       } else {
5699         /* NOTE: can't convert UTF8 sequences longer than 4 */
5700         utf8total = 4;
5701         ucs4 = c & 0x03;
5702       }
5703       continue;
5704     }
5705     /* loop to split ucs4 into two utf16 chars if necessary */
5706     utf8total = 0;
5707     do {
5708       if (ucs4 >= UTF16BASE) {
5709         ucs4 -= UTF16BASE;
5710         bitbuf = (bitbuf << 16) | ((ucs4 >> UTF16SHIFT)
5711                                    + UTF16HIGHSTART);
5712         ucs4 = (ucs4 & UTF16MASK) + UTF16LOSTART;
5713         utf16flag = 1;
5714       } else {
5715         bitbuf = (bitbuf << 16) | ucs4;
5716         utf16flag = 0;
5717       }
5718       bitstogo += 16;
5719       /* spew out base64 */
5720       while (bitstogo >= 6) {
5721         bitstogo -= 6;
5722         *dst++ = base64chars[(bitstogo ? (bitbuf >> bitstogo)
5723                               : bitbuf)
5724                              & 0x3F];
5725       }
5726     } while (utf16flag);
5727   }
5728   /* if in UTF-7 mode, finish in ASCII */
5729   if (utf7mode) {
5730     if (bitstogo) {
5731       *dst++ = base64chars[(bitbuf << (6 - bitstogo)) & 0x3F];
5732     }
5733     *dst++ = '-';
5734   }
5735   /* tie off string */
5736   *dst = '\0';
5737   return res;
5738 }