* src/folder.[ch]
[claws.git] / src / imap.c
index a4a05f5c3ae5ca9346f4e31ebfdcb38229421b5d..2024a5a14869b5084359c9614831c82a5a85269d 100644 (file)
        }                                                       \
 }
 
+struct _IMAPFolderItem
+{
+       FolderItem item;
+
+       guint lastuid;
+       GSList *uid_list;
+};
+
 static GList *session_list = NULL;
 
 static gint imap_cmd_count = 0;
@@ -77,11 +85,16 @@ static void imap_folder_init                (Folder         *folder,
                                         const gchar    *name,
                                         const gchar    *path);
 
+static FolderItem *imap_folder_item_new        (Folder         *folder);
+static void imap_folder_item_destroy   (Folder         *folder,
+                                        FolderItem     *item);
+
 static IMAPSession *imap_session_get   (Folder         *folder);
 
 static gint imap_scan_tree_recursive   (IMAPSession    *session,
                                         FolderItem     *item);
-static GSList *imap_parse_list         (IMAPSession    *session,
+static GSList *imap_parse_list         (Folder         *folder,
+                                        IMAPSession    *session,
                                         const gchar    *real_path);
 
 static void imap_create_missing_folders        (Folder                 *folder);
@@ -270,7 +283,13 @@ static gchar *imap_locale_to_modified_utf7 (const gchar    *from);
 
 static gboolean imap_rename_folder_func                (GNode          *node,
                                                 gpointer        data);
-
+GSList *imap_get_num_list                      (Folder         *folder,
+                                                FolderItem     *item);
+MsgInfo *imap_fetch_msginfo                    (Folder         *folder,
+                                                FolderItem     *item,
+                                                gint            num);
+gboolean imap_check_msgnum_validity            (Folder         *folder,
+                                                FolderItem     *item);
 
 Folder *imap_folder_new(const gchar *name, const gchar *path)
 {
@@ -282,34 +301,96 @@ Folder *imap_folder_new(const gchar *name, const gchar *path)
        return folder;
 }
 
-void imap_folder_destroy(IMAPFolder *folder)
+void imap_folder_destroy(Folder *folder)
 {
+       gchar *dir;
+
+       dir = folder_get_path(folder);
+       if (is_dir_exist(dir))
+               remove_dir_recursive(dir);
+       g_free(dir);
+
        folder_remote_folder_destroy(REMOTE_FOLDER(folder));
 }
 
 static void imap_folder_init(Folder *folder, const gchar *name,
                             const gchar *path)
 {
-       folder_remote_folder_init(folder, name, path);
-
        folder->type = F_IMAP;
 
+       folder_remote_folder_init((Folder *)folder, name, path);
+
+/*
        folder->get_msg_list        = imap_get_msg_list;
-       folder->fetch_msg           = imap_fetch_msg;
-       folder->add_msg             = imap_add_msg;
-       folder->move_msg            = imap_move_msg;
-       folder->move_msgs_with_dest = imap_move_msgs_with_dest;
-       folder->copy_msg            = imap_copy_msg;
-       folder->copy_msgs_with_dest = imap_copy_msgs_with_dest;
-       folder->remove_msg          = imap_remove_msg;
-       folder->remove_all_msg      = imap_remove_all_msg;
-       folder->is_msg_changed      = imap_is_msg_changed;
+*/
+       folder->item_new              = imap_folder_item_new;
+       folder->item_destroy          = imap_folder_item_destroy;
+       folder->fetch_msg             = imap_fetch_msg;
+       folder->add_msg               = imap_add_msg;
+       folder->move_msg              = imap_move_msg;
+       folder->move_msgs_with_dest   = imap_move_msgs_with_dest;
+       folder->copy_msg              = imap_copy_msg;
+       folder->copy_msgs_with_dest   = imap_copy_msgs_with_dest;
+       folder->remove_msg            = imap_remove_msg;
+       folder->remove_msgs           = imap_remove_msgs;
+       folder->remove_all_msg        = imap_remove_all_msg;
+       folder->is_msg_changed        = imap_is_msg_changed;
+/*
        folder->scan                = imap_scan_folder;
-       folder->scan_tree           = imap_scan_tree;
-       folder->create_tree         = imap_create_tree;
-       folder->create_folder       = imap_create_folder;
-       folder->rename_folder       = imap_rename_folder;
-       folder->remove_folder       = imap_remove_folder;
+*/
+       folder->scan_tree             = imap_scan_tree;
+       folder->create_tree           = imap_create_tree;
+       folder->create_folder         = imap_create_folder;
+       folder->rename_folder         = imap_rename_folder;
+       folder->remove_folder         = imap_remove_folder;
+       folder->destroy               = imap_folder_destroy;
+       folder->check_msgnum_validity = imap_check_msgnum_validity;
+
+       folder->get_num_list          = imap_get_num_list;
+       folder->fetch_msginfo         = imap_fetch_msginfo;
+       
+       ((IMAPFolder *)folder)->selected_folder = NULL;
+}
+
+static FolderItem *imap_folder_item_new(Folder *folder)
+{
+       IMAPFolderItem *item;
+       
+       item = g_new0(IMAPFolderItem, 1);
+       item->lastuid = 0;
+       item->uid_list = NULL;
+
+       return (FolderItem *)item;
+}
+
+static void imap_folder_item_destroy(Folder *folder, FolderItem *_item)
+{
+       IMAPFolderItem *item = (IMAPFolderItem *)_item;
+
+       g_return_if_fail(item != NULL);
+       g_slist_free(item->uid_list);
+
+       g_free(_item);
+}
+
+static gboolean imap_reset_uid_lists_func(GNode *node, gpointer data)
+{
+       IMAPFolderItem *item = (IMAPFolderItem *)node->data;
+       
+       item->lastuid = 0;
+       g_slist_free(item->uid_list);
+       item->uid_list = NULL;
+       
+       return FALSE;
+}
+
+static void imap_reset_uid_lists(Folder *folder)
+{
+       if(folder->node == NULL)
+               return;
+       
+       /* Destroy all uid lists and rest last uid */
+       g_node_traverse(folder->node, G_IN_ORDER, G_TRAVERSE_ALL, -1, imap_reset_uid_lists_func, NULL); 
 }
 
 static IMAPSession *imap_session_get(Folder *folder)
@@ -337,6 +418,9 @@ static IMAPSession *imap_session_get(Folder *folder)
                        imap_parse_namespace(IMAP_SESSION(rfolder->session),
                                             IMAP_FOLDER(folder));
                        rfolder->session->last_access_time = time(NULL);
+                       g_free(((IMAPFolder *)folder)->selected_folder);
+                       ((IMAPFolder *)folder)->selected_folder = NULL;
+                       imap_reset_uid_lists(folder);
                }
                statusbar_pop_all();
                return IMAP_SESSION(rfolder->session);
@@ -363,9 +447,13 @@ static IMAPSession *imap_session_get(Folder *folder)
                session_destroy(rfolder->session);
                rfolder->session =
                        imap_session_new(folder->account);
-               if (rfolder->session)
+               if (rfolder->session) {
                        imap_parse_namespace(IMAP_SESSION(rfolder->session),
                                             IMAP_FOLDER(folder));
+                       g_free(((IMAPFolder *)folder)->selected_folder);
+                       ((IMAPFolder *)folder)->selected_folder = NULL;
+                       imap_reset_uid_lists(folder);
+               }
        }
 
        if (rfolder->session)
@@ -445,6 +533,7 @@ Session *imap_session_new(const PrefsAccount *account)
        }
 
        session = g_new(IMAPSession, 1);
+
        SESSION(session)->type             = SESSION_IMAP;
        SESSION(session)->server           = g_strdup(account->recv_server);
        SESSION(session)->sock             = imap_sock;
@@ -452,6 +541,9 @@ Session *imap_session_new(const PrefsAccount *account)
        SESSION(session)->phase            = SESSION_READY;
        SESSION(session)->last_access_time = time(NULL);
        SESSION(session)->data             = NULL;
+
+       SESSION(session)->destroy          = imap_session_destroy;
+
        session->mbox = NULL;
 
        session_list = g_list_append(session_list, session);
@@ -459,12 +551,12 @@ Session *imap_session_new(const PrefsAccount *account)
        return SESSION(session);
 }
 
-void imap_session_destroy(IMAPSession *session)
+void imap_session_destroy(Session *session)
 {
-       sock_close(SESSION(session)->sock);
-       SESSION(session)->sock = NULL;
+       sock_close(session->sock);
+       session->sock = NULL;
 
-       g_free(session->mbox);
+       g_free(IMAP_SESSION(session)->mbox);
 
        session_list = g_list_remove(session_list, session);
 }
@@ -498,7 +590,7 @@ GSList *imap_get_msg_list(Folder *folder, FolderItem *item, gboolean use_cache)
 
        if (!session) {
                mlist = procmsg_read_cache(item, FALSE);
-               item->last_num = procmsg_get_last_num_in_cache(mlist);
+               item->last_num = procmsg_get_last_num_in_msg_list(mlist);
                procmsg_set_flags(mlist, item);
                statusbar_pop_all();
                return mlist;
@@ -526,7 +618,7 @@ GSList *imap_get_msg_list(Folder *folder, FolderItem *item, gboolean use_cache)
 
                mlist = procmsg_read_cache(item, FALSE);
                procmsg_set_flags(mlist, item);
-               cache_last = procmsg_get_last_num_in_cache(mlist);
+               cache_last = procmsg_get_last_num_in_msg_list(mlist);
 
                /* calculating the range of envelope to get */
                if (item->mtime != uid_validity) {
@@ -591,7 +683,7 @@ gchar *imap_fetch_msg(Folder *folder, FolderItem *item, gint uid)
        g_free(path);
  
        if (is_file_exist(filename)) {
-               debug_print(_("message %d has been already cached.\n"), uid);
+               debug_print("message %d has been already cached.\n", uid);
                return filename;
        }
 
@@ -610,7 +702,7 @@ gchar *imap_fetch_msg(Folder *folder, FolderItem *item, gint uid)
                return NULL;
        }
 
-       debug_print(_("getting message %d...\n"), uid);
+       debug_print("getting message %d...\n", uid);
        ok = imap_cmd_fetch(SESSION(session)->sock, (guint32)uid, filename);
 
        statusbar_pop_all();
@@ -670,6 +762,8 @@ static gint imap_do_copy(Folder *folder, FolderItem *dest, MsgInfo *msginfo,
 {
        gchar *destdir;
        IMAPSession *session;
+       gint messages, recent, unseen;
+       guint32 uid_next, uid_validity;
        gint ok;
 
        g_return_val_if_fail(folder != NULL, -1);
@@ -685,14 +779,22 @@ static gint imap_do_copy(Folder *folder, FolderItem *dest, MsgInfo *msginfo,
                return -1;
        }
 
+       ok = imap_status(session, IMAP_FOLDER(folder), dest->path,
+                        &messages, &recent, &uid_next, &uid_validity, &unseen);
+       statusbar_pop_all();
+       if (ok != IMAP_SUCCESS) {
+               g_warning(_("can't copy message\n"));
+               return -1;
+       }
+
        destdir = imap_get_real_path(IMAP_FOLDER(folder), dest->path);
 
        if (remove_source)
-               debug_print(_("Moving message %s%c%d to %s ...\n"),
+               debug_print("Moving message %s%c%d to %s ...\n",
                            msginfo->folder->path, G_DIR_SEPARATOR,
                            msginfo->msgnum, destdir);
        else
-               debug_print(_("Copying message %s%c%d to %s ...\n"),
+               debug_print("Copying message %s%c%d to %s ...\n",
                            msginfo->folder->path, G_DIR_SEPARATOR,
                            msginfo->msgnum, destdir);
 
@@ -708,7 +810,7 @@ static gint imap_do_copy(Folder *folder, FolderItem *dest, MsgInfo *msginfo,
        statusbar_pop_all();
 
        if (ok == IMAP_SUCCESS)
-               return 0;
+               return uid_next;
        else
                return -1;
 }
@@ -741,11 +843,11 @@ static gint imap_do_copy_msgs_with_dest(Folder *folder, FolderItem *dest,
                }
 
                if (remove_source)
-                       debug_print(_("Moving message %s%c%d to %s ...\n"),
+                       debug_print("Moving message %s%c%d to %s ...\n",
                                    msginfo->folder->path, G_DIR_SEPARATOR,
                                    msginfo->msgnum, destdir);
                else
-                       debug_print(_("Copying message %s%c%d to %s ...\n"),
+                       debug_print("Copying message %s%c%d to %s ...\n",
                                    msginfo->folder->path, G_DIR_SEPARATOR,
                                    msginfo->msgnum, destdir);
 
@@ -790,9 +892,12 @@ gint imap_move_msg(Folder *folder, FolderItem *dest, MsgInfo *msginfo)
        ret = imap_add_msg(folder, dest, srcfile, FALSE);
        g_free(srcfile);
 
-       if (ret != -1)
-               ret = folder_item_remove_msg(msginfo->folder, msginfo->msgnum);
-
+       if (ret != -1) {
+               if(folder_item_remove_msg(msginfo->folder, msginfo->msgnum)) {
+                       ret = -1;
+               }
+       }
+               
        return ret;
 }
 
@@ -874,6 +979,7 @@ gint imap_remove_msg(Folder *folder, FolderItem *item, gint uid)
        guint32 uid_validity;
        gint ok;
        IMAPSession *session;
+       gchar *dir;
 
        g_return_val_if_fail(folder != NULL, -1);
        g_return_val_if_fail(folder->type == F_IMAP, -1);
@@ -904,6 +1010,69 @@ gint imap_remove_msg(Folder *folder, FolderItem *item, gint uid)
                return ok;
        }
 
+       dir = folder_item_get_path(item);
+       if (is_dir_exist(dir))
+               remove_numbered_files(dir, uid, uid);
+       g_free(dir);
+
+       return IMAP_SUCCESS;
+}
+
+gint imap_remove_msgs(Folder *folder, FolderItem *item, GSList *msglist)
+{
+       gint exists, recent, unseen;
+       guint32 uid_validity;
+       gint ok;
+       IMAPSession *session;
+       gchar *dir;
+       MsgInfo *msginfo;
+       GSList *cur;
+       guint32 uid;
+
+       g_return_val_if_fail(folder != NULL, -1);
+       g_return_val_if_fail(folder->type == F_IMAP, -1);
+       g_return_val_if_fail(item != NULL, -1);
+       g_return_val_if_fail(msglist != NULL, -1);
+
+       session = imap_session_get(folder);
+       if (!session) return -1;
+
+       ok = imap_select(session, IMAP_FOLDER(folder), item->path,
+                        &exists, &recent, &unseen, &uid_validity);
+       statusbar_pop_all();
+       if (ok != IMAP_SUCCESS)
+               return ok;
+
+       for (cur = msglist; cur != NULL; cur = cur->next) {
+               msginfo = (MsgInfo *)cur->data;
+               uid = msginfo->msgnum;
+               ok = imap_set_message_flags
+                       (IMAP_SESSION(REMOTE_FOLDER(folder)->session),
+                        uid, uid, IMAP_FLAG_DELETED, TRUE);
+               statusbar_pop_all();
+               if (ok != IMAP_SUCCESS) {
+                       log_warning(_("can't set deleted flags: %d\n"), uid);
+                       return ok;
+               }
+       }
+
+       ok = imap_cmd_expunge(SESSION(session)->sock);
+       statusbar_pop_all();
+       if (ok != IMAP_SUCCESS) {
+               log_warning(_("can't expunge\n"));
+               return ok;
+       }
+
+       dir = folder_item_get_path(item);
+       if (is_dir_exist(dir)) {
+               for (cur = msglist; cur != NULL; cur = cur->next) {
+                       msginfo = (MsgInfo *)cur->data;
+                       uid = msginfo->msgnum;
+                       remove_numbered_files(dir, uid, uid);
+               }
+       }
+       g_free(dir);
        return IMAP_SUCCESS;
 }
 
@@ -913,6 +1082,7 @@ gint imap_remove_all_msg(Folder *folder, FolderItem *item)
        guint32 uid_validity;
        gint ok;
        IMAPSession *session;
+       gchar *dir;
 
        g_return_val_if_fail(folder != NULL, -1);
        g_return_val_if_fail(item != NULL, -1);
@@ -944,6 +1114,11 @@ gint imap_remove_all_msg(Folder *folder, FolderItem *item)
                return ok;
        }
 
+       dir = folder_item_get_path(item);
+       if (is_dir_exist(dir))
+               remove_all_numbered_files(dir);
+       g_free(dir);
+
        return IMAP_SUCCESS;
 }
 
@@ -990,7 +1165,15 @@ void imap_scan_tree(Folder *folder)
        g_return_if_fail(folder->account != NULL);
 
        session = imap_session_get(folder);
-       if (!session) return;
+       if (!session) {
+               if (!folder->node) {
+                       folder_tree_destroy(folder);
+                       item = folder_item_new(folder, folder->name, NULL);
+                       item->folder = folder;
+                       folder->node = g_node_new(item);
+               }
+               return;
+       }
 
        if (folder->account->imap_dir && *folder->account->imap_dir) {
                Xstrdup_a(root_folder, folder->account->imap_dir, return);
@@ -998,9 +1181,9 @@ void imap_scan_tree(Folder *folder)
                debug_print("IMAP root directory: %s\n", root_folder);
        }
 
-       folder_tree_destroy(folder);
-       item = folder_item_new(folder->name, root_folder);
+       item = folder_item_new(folder, folder->name, root_folder);
        item->folder = folder;
+       item->no_select = TRUE;
        folder->node = g_node_new(item);
 
        imap_scan_tree_recursive(session, item);
@@ -1050,7 +1233,7 @@ static gint imap_scan_tree_recursive(IMAPSession *session, FolderItem *item)
                          wildcard_path);
 
        strtailchomp(real_path, separator);
-       item_list = imap_parse_list(session, real_path);
+       item_list = imap_parse_list(folder, session, real_path);
        g_free(real_path);
 
        for (cur = item_list; cur != NULL; cur = cur->next) {
@@ -1092,7 +1275,7 @@ static gint imap_scan_tree_recursive(IMAPSession *session, FolderItem *item)
        return IMAP_SUCCESS;
 }
 
-static GSList *imap_parse_list(IMAPSession *session, const gchar *real_path)
+static GSList *imap_parse_list(Folder *folder, IMAPSession *session, const gchar *real_path)
 {
        gchar buf[IMAPBUFSIZE];
        gchar flags[256];
@@ -1156,7 +1339,7 @@ static GSList *imap_parse_list(IMAPSession *session, const gchar *real_path)
 
                loc_name = imap_modified_utf7_to_locale(name);
                loc_path = imap_modified_utf7_to_locale(buf);
-               new_item = folder_item_new(loc_name, loc_path);
+               new_item = folder_item_new(folder, loc_name, loc_path);
                if (strcasestr(flags, "\\Noinferiors") != NULL)
                        new_item->no_sub = TRUE;
                if (strcmp(buf, "INBOX") != 0 &&
@@ -1326,7 +1509,7 @@ FolderItem *imap_create_folder(Folder *folder, FolderItem *parent,
                }
        }
 
-       new_item = folder_item_new(new_name, dirpath);
+       new_item = folder_item_new(folder, new_name, dirpath);
        folder_item_append(parent, new_item);
        g_free(imap_path);
        g_free(dirpath);
@@ -1553,11 +1736,12 @@ static GSList *imap_delete_cached_messages(GSList *mlist, FolderItem *item,
        g_return_val_if_fail(item->folder != NULL, mlist);
        g_return_val_if_fail(item->folder->type == F_IMAP, mlist);
 
-       debug_print(_("Deleting cached messages %u - %u ... "),
+       debug_print("Deleting cached messages %u - %u ... ",
                    first_uid, last_uid);
 
        dir = folder_item_get_path(item);
-       remove_numbered_files(dir, first_uid, last_uid);
+       if (is_dir_exist(dir))
+               remove_numbered_files(dir, first_uid, last_uid);
        g_free(dir);
 
        for (cur = mlist; cur != NULL; ) {
@@ -1573,7 +1757,7 @@ static GSList *imap_delete_cached_messages(GSList *mlist, FolderItem *item,
                cur = next;
        }
 
-       debug_print(_("done.\n"));
+       debug_print("done.\n");
 
        return mlist;
 }
@@ -1586,13 +1770,14 @@ static void imap_delete_all_cached_messages(FolderItem *item)
        g_return_if_fail(item->folder != NULL);
        g_return_if_fail(item->folder->type == F_IMAP);
 
-       debug_print(_("Deleting all cached messages... "));
+       debug_print("Deleting all cached messages...\n");
 
        dir = folder_item_get_path(item);
-       remove_all_numbered_files(dir);
+       if (is_dir_exist(dir))
+               remove_all_numbered_files(dir);
        g_free(dir);
 
-       debug_print(_("done.\n"));
+       debug_print("done.\n");
 }
 
 #if USE_SSL
@@ -2180,6 +2365,9 @@ static gint imap_select(IMAPSession *session, IMAPFolder *folder,
                session->mbox = g_strdup(path);
        g_free(real_path);
 
+       g_free(folder->selected_folder);
+       folder->selected_folder = g_strdup(path);
+       
        return ok;
 }
 
@@ -3012,3 +3200,184 @@ static gboolean imap_rename_folder_func(GNode *node, gpointer data)
 
        return FALSE;
 }
+
+GSList *imap_get_num_list(Folder *folder, FolderItem *_item)
+{
+       IMAPFolderItem *item = (IMAPFolderItem *)_item;
+       IMAPSession *session;
+       GSList *msgnum_list = NULL;
+       gint i, lastuid_old;
+       gint ok, exists = 0, recent = 0, unseen = 0;
+       guint32 uid_validity = 0;
+       GPtrArray *argbuf;
+       gchar *cmdbuf = NULL;
+       gchar *dir;
+       
+       g_return_val_if_fail(folder != NULL, NULL);
+       g_return_val_if_fail(item != NULL, NULL);
+       g_return_val_if_fail(item->item.path != NULL, NULL);
+       g_return_val_if_fail(folder->type == F_IMAP, NULL);
+       g_return_val_if_fail(folder->account != NULL, NULL);
+
+       session = imap_session_get(folder);
+       g_return_val_if_fail(session != NULL, NULL);
+
+       ok = imap_select(session, IMAP_FOLDER(folder), item->item.path,
+                        &exists, &recent, &unseen, &uid_validity);
+       if (ok != IMAP_SUCCESS)
+               return NULL;
+
+       argbuf = g_ptr_array_new();
+       if(item->lastuid) {
+               cmdbuf = g_strdup_printf("UID FETCH %d:* (UID)", (item->lastuid + 1));
+       } else {
+               cmdbuf = g_strdup("FETCH 1:* (UID)");
+       }
+       imap_cmd_gen_send(SESSION(session)->sock, cmdbuf);
+       g_free(cmdbuf);
+       ok = imap_cmd_ok(SESSION(session)->sock, argbuf);
+       if (ok != IMAP_SUCCESS) {
+               ptr_array_free_strings(argbuf);
+               g_ptr_array_free(argbuf, TRUE);
+               return NULL;
+       }
+
+       lastuid_old = item->lastuid;
+       msgnum_list = g_slist_copy(item->uid_list);
+       debug_print("Got %d uids from cache\n", g_slist_length(msgnum_list));
+       for(i = 0; i < argbuf->len; i++) {
+               int ret, msgidx, msgnum;
+       
+               if((ret = sscanf(g_ptr_array_index(argbuf, i), "%d FETCH (UID %d)", &msgidx, &msgnum)) == 2) {
+                       if(msgnum > lastuid_old) {
+                               msgnum_list = g_slist_prepend(msgnum_list, GINT_TO_POINTER(msgnum));
+                               item->uid_list = g_slist_prepend(item->uid_list, GINT_TO_POINTER(msgnum));
+
+                               if(msgnum > item->lastuid)
+                                       item->lastuid = msgnum;
+                       }
+               }
+       }
+
+       dir = folder_item_get_path((FolderItem *)item);
+       debug_print("removing old messages from %s\n", dir);
+       remove_numbered_files_not_in_list(dir, msgnum_list);
+       g_free(dir);
+
+       return msgnum_list;
+}
+
+MsgInfo *imap_fetch_msginfo(Folder *_folder, FolderItem *item, gint num)
+{
+       IMAPFolder *folder = (IMAPFolder *)_folder;
+       gchar *tmp;
+       IMAPSession *session;
+       GString *str;
+       MsgInfo *msginfo;
+       int same_folder;
+       
+       g_return_val_if_fail(folder != NULL, NULL);
+       g_return_val_if_fail(item != NULL, NULL);
+       g_return_val_if_fail(item->folder != NULL, NULL);
+       g_return_val_if_fail(item->folder->type == F_IMAP, NULL);
+
+       session = imap_session_get(_folder);
+       g_return_val_if_fail(session != NULL, NULL);
+
+       same_folder = FALSE;
+       if (folder->selected_folder != NULL)
+               if (strcmp(folder->selected_folder, item->path) == 0)
+                       same_folder = TRUE;
+       
+       if (!same_folder) {
+               gint ok, exists = 0, recent = 0, unseen = 0;
+               guint32 uid_validity = 0;
+
+               ok = imap_select(session, IMAP_FOLDER(folder), item->path,
+                                &exists, &recent, &unseen, &uid_validity);
+               if (ok != IMAP_SUCCESS)
+                       return NULL;
+       }
+       
+       if (imap_cmd_envelope(SESSION(session)->sock, num, num)
+           != IMAP_SUCCESS) {
+               log_warning(_("can't get envelope\n"));
+               return NULL;
+       }
+
+       str = g_string_new(NULL);
+
+       if ((tmp = sock_getline(SESSION(session)->sock)) == NULL) {
+               log_warning(_("error occurred while getting envelope.\n"));
+               g_string_free(str, TRUE);
+               return NULL;
+       }
+       strretchomp(tmp);
+       log_print("IMAP4< %s\n", tmp);
+       g_string_assign(str, tmp);
+       g_free(tmp);
+
+       /* if the server did not return a envelope */
+       if (str->str[0] != '*') {
+               g_string_free(str, TRUE);
+               return NULL;
+       }
+
+       msginfo = imap_parse_envelope(SESSION(session)->sock,
+                                     item, str);
+
+       /* Read all data on the socket until the server is read for a new command */
+       tmp = NULL;
+       do {
+               g_free(tmp);
+               tmp = sock_getline(SESSION(session)->sock);
+       } while (!(tmp == NULL || tmp[0] != '*' || tmp[1] != ' '));
+       g_free(tmp);
+
+       /* if message header could not be parsed */
+       if (!msginfo) {
+               log_warning(_("can't parse envelope: %s\n"), str->str);
+               return NULL;
+       }
+
+       g_string_free(str, TRUE);
+
+       msginfo->folder = item;
+
+       return msginfo;
+}
+
+gboolean imap_check_msgnum_validity(Folder *folder, FolderItem *_item)
+{
+       IMAPSession *session;
+       IMAPFolderItem *item = (IMAPFolderItem *)_item;
+       gint ok, exists = 0, recent = 0, unseen = 0;
+       guint32 uid_next, uid_validity = 0;
+       
+       g_return_val_if_fail(folder != NULL, FALSE);
+       g_return_val_if_fail(item != NULL, FALSE);
+       g_return_val_if_fail(item->item.folder != NULL, FALSE);
+       g_return_val_if_fail(item->item.folder->type == F_IMAP, FALSE);
+
+       session = imap_session_get(folder);
+       g_return_val_if_fail(session != NULL, FALSE);
+
+       ok = imap_status(session, IMAP_FOLDER(folder), item->item.path,
+                        &exists, &recent, &uid_next, &uid_validity, &unseen);
+       if (ok != IMAP_SUCCESS)
+               return FALSE;
+
+       if(item->item.mtime == uid_validity)
+               return TRUE;
+
+       debug_print("Freeing imap uid cache");
+       item->lastuid = 0;
+       g_slist_free(item->uid_list);
+       item->uid_list = NULL;
+               
+       item->item.mtime = uid_validity;
+
+       imap_delete_all_cached_messages((FolderItem *)item);
+
+       return FALSE;
+}