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