From 6ddb16d181e285d4f0ef0ef55bdd0ba787f1b583 Mon Sep 17 00:00:00 2001
From: Thomas Bruederli <thomas@roundcube.net>
Date: Sat, 17 Nov 2012 10:24:09 -0500
Subject: [PATCH] Merge branch 'master' of github.com:roundcube/roundcubemail

---
 program/include/rcube_imap.php |  523 ++++++++++++++++++++++++++++++++++++++-------------------
 1 files changed, 349 insertions(+), 174 deletions(-)

diff --git a/program/include/rcube_imap.php b/program/include/rcube_imap.php
index 2be2256..9054b6b 100644
--- a/program/include/rcube_imap.php
+++ b/program/include/rcube_imap.php
@@ -19,19 +19,16 @@
  | Author: Thomas Bruederli <roundcube@gmail.com>                        |
  | Author: Aleksander Machniak <alec@alec.pl>                            |
  +-----------------------------------------------------------------------+
-
- $Id$
-
 */
 
 
 /**
  * Interface class for accessing an IMAP server
  *
- * @package    Mail
+ * @package    Framework
+ * @subpackage Storage
  * @author     Thomas Bruederli <roundcube@gmail.com>
  * @author     Aleksander Machniak <alec@alec.pl>
- * @version    2.0
  */
 class rcube_imap extends rcube_storage
 {
@@ -132,7 +129,7 @@
             $this->options['ssl_mode'] = $use_ssl == 'imaps' ? 'ssl' : $use_ssl;
         }
         else if ($use_ssl) {
-            raise_error(array('code' => 403, 'type' => 'imap',
+            rcube::raise_error(array('code' => 403, 'type' => 'imap',
                 'file' => __FILE__, 'line' => __LINE__,
                 'message' => "OpenSSL not available"), true, false);
             $port = 143;
@@ -154,7 +151,7 @@
 
         $attempt = 0;
         do {
-            $data = rcmail::get_instance()->plugins->exec_hook('imap_connect',
+            $data = rcube::get_instance()->plugins->exec_hook('imap_connect',
                 array_merge($this->options, array('host' => $host, 'user' => $user,
                     'attempt' => ++$attempt)));
 
@@ -185,9 +182,9 @@
         else if ($this->conn->error) {
             if ($pass && $user) {
                 $message = sprintf("Login failed for %s from %s. %s",
-                    $user, rcmail_remote_ip(), $this->conn->error);
+                    $user, rcube_utils::remote_ip(), $this->conn->error);
 
-                raise_error(array('code' => 403, 'type' => 'imap',
+                rcube::raise_error(array('code' => 403, 'type' => 'imap',
                     'file' => __FILE__, 'line' => __LINE__,
                     'message' => $message), true, false);
             }
@@ -362,11 +359,11 @@
 
         return array(
             $this->search_string,
-	        $this->search_set,
-        	$this->search_charset,
-        	$this->search_sort_field,
-        	$this->search_sorted,
-	    );
+            $this->search_set,
+            $this->search_charset,
+            $this->search_sort_field,
+            $this->search_sorted,
+        );
     }
 
 
@@ -404,15 +401,56 @@
      */
     public function check_permflag($flag)
     {
-        $flag = strtoupper($flag);
-        $imap_flag = $this->conn->flags[$flag];
+        $flag       = strtoupper($flag);
+        $imap_flag  = $this->conn->flags[$flag];
+        $perm_flags = $this->get_permflags($this->folder);
 
-        if ($this->folder !== null) {
-            $this->check_connection();
+        return in_array_nocase($imap_flag, $perm_flags);
+    }
+
+
+    /**
+     * Returns PERMANENTFLAGS of the specified folder
+     *
+     * @param  string $folder Folder name
+     *
+     * @return array Flags
+     */
+    public function get_permflags($folder)
+    {
+        if (!strlen($folder)) {
+            return array();
         }
-        // @TODO: cache permanent flags (?)
+/*
+        Checking PERMANENTFLAGS is rather rare, so we disable caching of it
+        Re-think when we'll use it for more than only MDNSENT flag
 
-        return (in_array_nocase($imap_flag, $this->conn->data['PERMANENTFLAGS']));
+        $cache_key = 'mailboxes.permanentflags.' . $folder;
+        $permflags = $this->get_cache($cache_key);
+
+        if ($permflags !== null) {
+            return explode(' ', $permflags);
+        }
+*/
+        if (!$this->check_connection()) {
+            return array();
+        }
+
+        if ($this->conn->select($folder)) {
+            $permflags = $this->conn->data['PERMANENTFLAGS'];
+        }
+        else {
+            return array();
+        }
+
+        if (!is_array($permflags)) {
+            $permflags = array();
+        }
+/*
+        // Store permflags as string to limit cached object size
+        $this->update_cache($cache_key, implode(' ', $permflags));
+*/
+        return $permflags;
     }
 
 
@@ -457,7 +495,7 @@
             return;
         }
 
-        $config = rcmail::get_instance()->config;
+        $config = rcube::get_instance()->config;
         $imap_personal  = $config->get('imap_ns_personal');
         $imap_other     = $config->get('imap_ns_other');
         $imap_shared    = $config->get('imap_ns_shared');
@@ -546,7 +584,7 @@
             $folder = $this->folder;
         }
 
-        return $this->messagecount($folder, $mode, $force, $status);
+        return $this->countmessages($folder, $mode, $force, $status);
     }
 
 
@@ -562,12 +600,12 @@
      * @return int Number of messages
      * @see rcube_imap::count()
      */
-    protected function messagecount($folder, $mode='ALL', $force=false, $status=true)
+    protected function countmessages($folder, $mode='ALL', $force=false, $status=true)
     {
         $mode = strtoupper($mode);
 
-        // count search set
-        if ($this->search_string && $folder == $this->folder && ($mode == 'ALL' || $mode == 'THREADS') && !$force) {
+        // count search set, assume search set is always up-to-date (don't check $force flag)
+        if ($this->search_string && $folder == $this->folder && ($mode == 'ALL' || $mode == 'THREADS')) {
             if ($mode == 'ALL') {
                 return $this->search_set->count_messages();
             }
@@ -834,8 +872,8 @@
      * protected method for setting threaded messages flags:
      * depth, has_children and unread_children
      *
-     * @param  array             $headers Reference to headers array indexed by message UID
-     * @param  rcube_imap_result $threads Threads data object
+     * @param  array               $headers  Reference to headers array indexed by message UID
+     * @param  rcube_result_thread $threads  Threads data object
      *
      * @return array Message headers array indexed by message UID
      */
@@ -974,8 +1012,8 @@
                 $a_msg_headers, $this->sort_field, $this->sort_order);
 
             // only return the requested part of the set
-            $a_msg_headers = array_slice(array_values($a_msg_headers),
-                $from, min($cnt-$to, $this->page_size));
+            $slice_length  = min($this->page_size, $cnt - ($to > $cnt ? $from : $to));
+            $a_msg_headers = array_slice(array_values($a_msg_headers), $from, $slice_length);
 
             if ($slice) {
                 $a_msg_headers = array_slice($a_msg_headers, -$slice, $slice);
@@ -1048,7 +1086,7 @@
 
         if ($sort) {
             // use this class for message sorting
-            $sorter = new rcube_header_sorter();
+            $sorter = new rcube_message_header_sorter();
             $sorter->set_index($msgs);
             $sorter->sort_headers($a_msg_headers);
         }
@@ -1075,7 +1113,7 @@
         $old = $this->get_folder_stats($folder);
 
         // refresh message count -> will update
-        $this->messagecount($folder, 'ALL', true);
+        $this->countmessages($folder, 'ALL', true);
 
         $result = 0;
 
@@ -1213,7 +1251,9 @@
         }
         // use message index sort as default sorting
         else if (!$sort_field) {
+            // use search result from count() if possible
             if ($this->options['skip_deleted'] && !empty($this->icache['undeleted_idx'])
+                && $this->icache['undeleted_idx']->get_parameters('ALL') !== null
                 && $this->icache['undeleted_idx']->get_parameters('MAILBOX') == $folder
             ) {
                 $index = $this->icache['undeleted_idx'];
@@ -1346,21 +1386,21 @@
      *
      * @return rcube_result_index  Search result (UIDs)
      */
-    public function search_once($mailbox = null, $str = 'ALL')
+    public function search_once($folder = null, $str = 'ALL')
     {
         if (!$str) {
             return 'ALL';
         }
 
-        if (!strlen($mailbox)) {
-            $mailbox = $this->mailbox;
+        if (!strlen($folder)) {
+            $folder = $this->folder;
         }
 
         if (!$this->check_connection()) {
             return new rcube_result_index();
         }
 
-        $index = $this->conn->search($mailbox, $str, true);
+        $index = $this->conn->search($folder, $str, true);
 
         return $index;
     }
@@ -1394,6 +1434,12 @@
             $criteria = 'UNDELETED '.$criteria;
         }
 
+        // unset CHARSET if criteria string is ASCII, this way
+        // SEARCH won't be re-sent after "unsupported charset" response
+        if ($charset && $charset != 'US-ASCII' && is_ascii($criteria)) {
+            $charset = 'US-ASCII';
+        }
+
         if ($this->threading) {
             $threads = $this->conn->thread($folder, $this->threading, $criteria, true, $charset);
 
@@ -1425,7 +1471,7 @@
         }
 
         $messages = $this->conn->search($folder,
-            ($charset ? "CHARSET $charset " : '') . $criteria, true);
+            ($charset && $charset != 'US-ASCII' ? "CHARSET $charset " : '') . $criteria, true);
 
         // Error, try with US-ASCII (some servers may support only US-ASCII)
         if ($messages->is_error() && $charset && $charset != 'US-ASCII') {
@@ -1456,7 +1502,7 @@
             foreach ($matches[1] as $m) {
                 $string_offset = $m[1] + strlen($m[0]) + 4; // {}\r\n
                 $string = substr($str, $string_offset - 1, $m[0]);
-                $string = rcube_charset_convert($string, $charset, $dest_charset);
+                $string = rcube_charset::convert($string, $charset, $dest_charset);
                 if ($string === false) {
                     continue;
                 }
@@ -1498,7 +1544,7 @@
      * @param string  $folder   Folder to read from
      * @param bool    $force    True to skip cache
      *
-     * @return rcube_mail_header Message headers
+     * @return rcube_message_header Message headers
      */
     public function get_message_headers($uid, $folder = null, $force = false)
     {
@@ -1529,7 +1575,7 @@
      * @param int     $uid      Message UID to fetch
      * @param string  $folder   Folder to read from
      *
-     * @return object rcube_mail_header Message data
+     * @return object rcube_message_header Message data
      */
     public function get_message($uid, $folder = null)
     {
@@ -1595,11 +1641,24 @@
                 $structure[1] = $m[2];
             }
             else {
-                return $headers;
+                // Try to parse the message using Mail_mimeDecode package
+                // We need a better solution, Mail_mimeDecode parses message
+                // in memory, which wouldn't work for very big messages,
+                // (it uses up to 10x more memory than the message size)
+                // it's also buggy and not actively developed
+                if ($headers->size && rcube_utils::mem_check($headers->size * 10)) {
+                    $raw_msg = $this->get_raw_body($uid);
+                    $struct = rcube_mime::parse_message($raw_msg);
+                }
+                else {
+                    return $headers;
+                }
             }
         }
 
-        $struct = $this->structure_part($structure, 0, '', $headers);
+        if (empty($struct)) {
+            $struct = $this->structure_part($structure, 0, '', $headers);
+        }
 
         // don't trust given content-type
         if (empty($struct->parts) && !empty($headers->ctype)) {
@@ -1948,7 +2007,7 @@
                 $charset = $this->struct_charset;
             }
             else {
-                $charset = rc_detect_encoding($filename_mime, $this->default_charset);
+                $charset = rcube_charset::detect($filename_mime, $this->default_charset);
             }
 
             $part->filename = rcube_mime::decode_mime_string($filename_mime, $charset);
@@ -1960,7 +2019,7 @@
                 $filename_encoded = $fmatches[2];
             }
 
-            $part->filename = rcube_charset_convert(urldecode($filename_encoded), $filename_charset);
+            $part->filename = rcube_charset::convert(urldecode($filename_encoded), $filename_charset);
         }
     }
 
@@ -2015,7 +2074,7 @@
 
         if ($o_part && $o_part->size) {
             $body = $this->conn->handlePartBody($this->folder, $uid, true,
-                $part ? $part : 'TEXT', $o_part->encoding, $print, $fp);
+                $part ? $part : 'TEXT', $o_part->encoding, $print, $fp, $o_part->ctype_primary == 'text');
         }
 
         if ($fp || $print) {
@@ -2039,7 +2098,7 @@
                         $o_part->charset = $this->default_charset;
                     }
                 }
-                $body = rcube_charset_convert($body, $o_part->charset);
+                $body = rcube_charset::convert($body, $o_part->charset);
             }
         }
 
@@ -2085,14 +2144,17 @@
 
     /**
      * Sends the whole message source to stdout
+     *
+     * @param int  $uid       Message UID
+     * @param bool $formatted Enables line-ending formatting
      */
-    public function print_raw_body($uid)
+    public function print_raw_body($uid, $formatted = true)
     {
         if (!$this->check_connection()) {
             return;
         }
 
-        $this->conn->handlePartBody($this->folder, $uid, true, NULL, NULL, true);
+        $this->conn->handlePartBody($this->folder, $uid, true, null, null, true, null, $formatted);
     }
 
 
@@ -2157,23 +2219,33 @@
      * @param string  $message The message source string or filename
      * @param string  $headers Headers string if $message contains only the body
      * @param boolean $is_file True if $message is a filename
+     * @param array   $flags   Message flags
+     * @param mixed   $date    Message internal date
      *
      * @return int|bool Appended message UID or True on success, False on error
      */
-    public function save_message($folder, &$message, $headers='', $is_file=false)
+    public function save_message($folder, &$message, $headers='', $is_file=false, $flags = array(), $date = null)
     {
         if (!strlen($folder)) {
             $folder = $this->folder;
         }
 
+        if (!$this->check_connection()) {
+            return false;
+        }
+
         // make sure folder exists
-        if ($this->folder_exists($folder)) {
-            if ($is_file) {
-                $saved = $this->conn->appendFromFile($folder, $message, $headers);
-            }
-            else {
-                $saved = $this->conn->append($folder, $message);
-            }
+        if (!$this->folder_exists($folder)) {
+            return false;
+        }
+
+        $date = $this->date_format($date);
+
+        if ($is_file) {
+            $saved = $this->conn->appendFromFile($folder, $message, $headers, $flags, $date);
+        }
+        else {
+            $saved = $this->conn->append($folder, $message, $flags, $date);
         }
 
         if ($saved) {
@@ -2227,7 +2299,7 @@
             }
         }
 
-        $config = rcmail::get_instance()->config;
+        $config = rcube::get_instance()->config;
         $to_trash = $to_mbox == $config->get('trash_mbox');
 
         // flag messages as read before moving them
@@ -2466,7 +2538,16 @@
             return $a_mboxes;
         }
 
-        $a_mboxes = $this->_list_folders_subscribed($root, $name, $filter, $rights);
+        // Give plugins a chance to provide a list of folders
+        $data = rcube::get_instance()->plugins->exec_hook('storage_folders',
+            array('root' => $root, 'name' => $name, 'filter' => $filter, 'mode' => 'LSUB'));
+
+        if (isset($data['folders'])) {
+            $a_mboxes = $data['folders'];
+        }
+        else {
+            $a_mboxes = $this->list_folders_subscribed_direct($root, $name);
+        }
 
         if (!is_array($a_mboxes)) {
             return array();
@@ -2495,76 +2576,74 @@
 
 
     /**
-     * protected method for folders listing (LSUB)
+     * Method for direct folders listing (LSUB)
      *
      * @param   string  $root   Optional root folder
      * @param   string  $name   Optional name pattern
-     * @param   mixed   $filter Optional filter
-     * @param   string  $rights Optional ACL requirements
      *
      * @return  array   List of subscribed folders
      * @see     rcube_imap::list_folders_subscribed()
      */
-    protected function _list_folders_subscribed($root='', $name='*', $filter=null, $rights=null)
+    public function list_folders_subscribed_direct($root='', $name='*')
     {
-        $a_defaults = $a_out = array();
-
-        // Give plugins a chance to provide a list of folders
-        $data = rcmail::get_instance()->plugins->exec_hook('storage_folders',
-            array('root' => $root, 'name' => $name, 'filter' => $filter, 'mode' => 'LSUB'));
-
-        if (isset($data['folders'])) {
-            $a_folders = $data['folders'];
-        }
-        else if (!$this->check_connection()) {
+        if (!$this->check_connection()) {
            return null;
         }
-        else {
-            // Server supports LIST-EXTENDED, we can use selection options
-            $config = rcmail::get_instance()->config;
-            // #1486225: Some dovecot versions returns wrong result using LIST-EXTENDED
-            if (!$config->get('imap_force_lsub') && $this->get_capability('LIST-EXTENDED')) {
-                // This will also set folder options, LSUB doesn't do that
-                $a_folders = $this->conn->listMailboxes($root, $name,
-                    NULL, array('SUBSCRIBED'));
 
-                // unsubscribe non-existent folders, remove from the list
-                // we can do this only when LIST response is available
-                if (is_array($a_folders) && $name == '*' && !empty($this->conn->data['LIST'])) {
-                    foreach ($a_folders as $idx => $folder) {
-                        if (($opts = $this->conn->data['LIST'][$folder])
-                            && in_array('\\NonExistent', $opts)
-                        ) {
+        $config = rcube::get_instance()->config;
+
+        // Server supports LIST-EXTENDED, we can use selection options
+        // #1486225: Some dovecot versions returns wrong result using LIST-EXTENDED
+        $list_extended = !$config->get('imap_force_lsub') && $this->get_capability('LIST-EXTENDED');
+        if ($list_extended) {
+            // This will also set folder options, LSUB doesn't do that
+            $a_folders = $this->conn->listMailboxes($root, $name,
+                NULL, array('SUBSCRIBED'));
+        }
+        else {
+            // retrieve list of folders from IMAP server using LSUB
+            $a_folders = $this->conn->listSubscribed($root, $name);
+        }
+
+        if (!is_array($a_folders)) {
+            return array();
+        }
+
+        // #1486796: some server configurations doesn't return folders in all namespaces
+        if ($root == '' && $name == '*' && $config->get('imap_force_ns')) {
+            $this->list_folders_update($a_folders, ($list_extended ? 'ext-' : '') . 'subscribed');
+        }
+
+        if ($list_extended) {
+            // unsubscribe non-existent folders, remove from the list
+            // we can do this only when LIST response is available
+            if (is_array($a_folders) && $name == '*' && !empty($this->conn->data['LIST'])) {
+                foreach ($a_folders as $idx => $folder) {
+                    if (($opts = $this->conn->data['LIST'][$folder])
+                        && in_array('\\NonExistent', $opts)
+                    ) {
+                        $this->conn->unsubscribe($folder);
+                        unset($a_folders[$idx]);
+                    }
+                }
+            }
+        }
+        else {
+            // unsubscribe non-existent folders, remove them from the list,
+            // we can do this only when LIST response is available
+            if (is_array($a_folders) && $name == '*' && !empty($this->conn->data['LIST'])) {
+                foreach ($a_folders as $idx => $folder) {
+                    if (!isset($this->conn->data['LIST'][$folder])
+                        || in_array('\\Noselect', $this->conn->data['LIST'][$folder])
+                    ) {
+                        // Some servers returns \Noselect for existing folders
+                        if (!$this->folder_exists($folder)) {
                             $this->conn->unsubscribe($folder);
                             unset($a_folders[$idx]);
                         }
                     }
                 }
             }
-            // retrieve list of folders from IMAP server using LSUB
-            else {
-                $a_folders = $this->conn->listSubscribed($root, $name);
-
-                // unsubscribe non-existent folders, remove them from the list,
-                // we can do this only when LIST response is available
-                if (is_array($a_folders) && $name == '*' && !empty($this->conn->data['LIST'])) {
-                    foreach ($a_folders as $idx => $folder) {
-                        if (!isset($this->conn->data['LIST'][$folder])
-                            || in_array('\\Noselect', $this->conn->data['LIST'][$folder])
-                        ) {
-                            // Some servers returns \Noselect for existing folders
-                            if (!$this->folder_exists($folder)) {
-                                $this->conn->unsubscribe($folder);
-                                unset($a_folders[$idx]);
-                            }
-                        }
-                    }
-                }
-            }
-        }
-
-        if (!is_array($a_folders) || !sizeof($a_folders)) {
-            $a_folders = array();
         }
 
         return $a_folders;
@@ -2598,7 +2677,7 @@
         }
 
         // Give plugins a chance to provide a list of folders
-        $data = rcmail::get_instance()->plugins->exec_hook('storage_folders',
+        $data = rcube::get_instance()->plugins->exec_hook('storage_folders',
             array('root' => $root, 'name' => $name, 'filter' => $filter, 'mode' => 'LIST'));
 
         if (isset($data['folders'])) {
@@ -2606,7 +2685,7 @@
         }
         else {
             // retrieve list of folders from IMAP server
-            $a_mboxes = $this->_list_folders($root, $name);
+            $a_mboxes = $this->list_folders_direct($root, $name);
         }
 
         if (!is_array($a_mboxes)) {
@@ -2641,7 +2720,7 @@
 
 
     /**
-     * protected method for folders listing (LIST)
+     * Method for direct folders listing (LIST)
      *
      * @param   string  $root   Optional root folder
      * @param   string  $name   Optional name pattern
@@ -2649,7 +2728,7 @@
      * @return  array   List of folders
      * @see     rcube_imap::list_folders()
      */
-    protected function _list_folders($root='', $name='*')
+    public function list_folders_direct($root='', $name='*')
     {
         if (!$this->check_connection()) {
             return null;
@@ -2661,50 +2740,71 @@
             return array();
         }
 
-        // #1486796: some server configurations doesn't
-        // return folders in all namespaces, we'll try to detect that situation
-        // and ask for these namespaces separately
-        if ($root == '' && $name == '*') {
-            $delim     = $this->get_hierarchy_delimiter();
-            $namespace = $this->get_namespace();
-            $search    = array();
+        $config = rcube::get_instance()->config;
 
-            // build list of namespace prefixes
-            foreach ((array)$namespace as $ns) {
-                if (is_array($ns)) {
-                    foreach ($ns as $ns_data) {
-                        if (strlen($ns_data[0])) {
-                            $search[] = $ns_data[0];
-                        }
-                    }
-                }
-            }
+        // #1486796: some server configurations doesn't return folders in all namespaces
+        if ($root == '' && $name == '*' && $config->get('imap_force_ns')) {
+            $this->list_folders_update($result);
+        }
 
-            if (!empty($search)) {
-                // go through all folders detecting namespace usage
-                foreach ($result as $folder) {
-                    foreach ($search as $idx => $prefix) {
-                        if (strpos($folder, $prefix) === 0) {
-                            unset($search[$idx]);
-                        }
-                    }
-                    if (empty($search)) {
-                        break;
-                    }
-                }
+        return $result;
+    }
 
-                // get folders in hidden namespaces and add to the result
-                foreach ($search as $prefix) {
-                    $list = $this->conn->listMailboxes($prefix, $name);
 
-                    if (!empty($list)) {
-                        $result = array_merge($result, $list);
+    /**
+     * Fix folders list by adding folders from other namespaces.
+     * Needed on some servers eg. Courier IMAP
+     *
+     * @param array  $result  Reference to folders list
+     * @param string $type    Listing type (ext-subscribed, subscribed or all)
+     */
+    private function list_folders_update(&$result, $type = null)
+    {
+        $delim     = $this->get_hierarchy_delimiter();
+        $namespace = $this->get_namespace();
+        $search    = array();
+
+        // build list of namespace prefixes
+        foreach ((array)$namespace as $ns) {
+            if (is_array($ns)) {
+                foreach ($ns as $ns_data) {
+                    if (strlen($ns_data[0])) {
+                        $search[] = $ns_data[0];
                     }
                 }
             }
         }
 
-        return $result;
+        if (!empty($search)) {
+            // go through all folders detecting namespace usage
+            foreach ($result as $folder) {
+                foreach ($search as $idx => $prefix) {
+                    if (strpos($folder, $prefix) === 0) {
+                        unset($search[$idx]);
+                    }
+                }
+                if (empty($search)) {
+                    break;
+                }
+            }
+
+            // get folders in hidden namespaces and add to the result
+            foreach ($search as $prefix) {
+                if ($type == 'ext-subscribed') {
+                    $list = $this->conn->listMailboxes('', $prefix . '*', null, array('SUBSCRIBED'));
+                }
+                else if ($type == 'subscribed') {
+                    $list = $this->conn->listSubscribed('', $prefix . '*');
+                }
+                else {
+                    $list = $this->conn->listMailboxes('', $prefix . '*');
+                }
+
+                if (!empty($list)) {
+                    $result = array_merge($result, $list);
+                }
+            }
+        }
     }
 
 
@@ -2845,11 +2945,11 @@
 
         // get list of subscribed folders
         if ((strpos($folder, '%') === false) && (strpos($folder, '*') === false)) {
-            $a_subscribed = $this->_list_folders_subscribed('', $folder . $delm . '*');
+            $a_subscribed = $this->list_folders_subscribed('', $folder . $delm . '*');
             $subscribed   = $this->folder_exists($folder, true);
         }
         else {
-            $a_subscribed = $this->_list_folders_subscribed();
+            $a_subscribed = $this->list_folders_subscribed();
             $subscribed   = in_array($folder, $a_subscribed);
         }
 
@@ -2917,7 +3017,7 @@
                 if (strpos($c_mbox, $folder.$delm) === 0) {
                     $this->conn->unsubscribe($c_mbox);
                     if ($this->conn->deleteFolder($c_mbox)) {
-	                    $this->clear_message_cache($c_mbox);
+                        $this->clear_message_cache($c_mbox);
                     }
                 }
             }
@@ -3144,6 +3244,14 @@
             return $this->icache['options'];
         }
 
+        // get cached metadata
+        $cache_key = 'mailboxes.folder-info.' . $folder;
+        $cached = $this->get_cache($cache_key);
+
+        if (is_array($cached)) {
+            return $cached;
+        }
+
         $acl       = $this->get_capability('ACL');
         $namespace = $this->get_namespace();
         $options   = array();
@@ -3179,10 +3287,9 @@
         $options['name']       = $folder;
         $options['attributes'] = $this->folder_attributes($folder, true);
         $options['namespace']  = $this->folder_namespace($folder);
-        $options['rights']     = $acl && !$options['is_root'] ? (array)$this->my_rights($folder) : array();
         $options['special']    = in_array($folder, $this->default_folders);
 
-        // Set 'noselect' and 'norename' flags
+        // Set 'noselect' flag
         if (is_array($options['attributes'])) {
             foreach ($options['attributes'] as $attrib) {
                 $attrib = strtolower($attrib);
@@ -3195,6 +3302,12 @@
             $options['noselect'] = true;
         }
 
+        // Get folder rights (MYRIGHTS)
+        if ($acl && ($rights = $this->my_rights($folder))) {
+            $options['rights'] = $rights;
+        }
+
+        // Set 'norename' flag
         if (!empty($options['rights'])) {
             $options['norename'] = !in_array('x', $options['rights']) && !in_array('d', $options['rights']);
 
@@ -3206,7 +3319,9 @@
             $options['norename'] = $options['is_root'] || $options['namespace'] != 'personal';
         }
 
+        // update caches
         $this->icache['options'] = $options;
+        $this->update_cache($cache_key, $options);
 
         return $options;
     }
@@ -3271,6 +3386,8 @@
         if (!$this->check_connection()) {
             return false;
         }
+
+        $this->clear_cache('mailboxes.folder-info.' . $folder);
 
         return $this->conn->setACL($folder, $user, $acl);
     }
@@ -3385,6 +3502,8 @@
             return false;
         }
 
+        $this->clear_cache('mailboxes.metadata.', true);
+
         if ($this->get_capability('METADATA') ||
             (!strlen($folder) && $this->get_capability('METADATA-SERVER'))
         ) {
@@ -3417,7 +3536,9 @@
             return false;
         }
 
-        if ($this->get_capability('METADATA') || 
+        $this->clear_cache('mailboxes.metadata.', true);
+
+        if ($this->get_capability('METADATA') ||
             (!strlen($folder) && $this->get_capability('METADATA-SERVER'))
         ) {
             return $this->conn->deleteMetadata($folder, $entries);
@@ -3446,6 +3567,23 @@
      */
     public function get_metadata($folder, $entries, $options=array())
     {
+        $entries = (array)$entries;
+
+        // create cache key
+        // @TODO: this is the simplest solution, but we do the same with folders list
+        //        maybe we should store data per-entry and merge on request
+        sort($options);
+        sort($entries);
+        $cache_key = 'mailboxes.metadata.' . $folder;
+        $cache_key .= '.' . md5(serialize($options).serialize($entries));
+
+        // get cached data
+        $cached_data = $this->get_cache($cache_key);
+
+        if (is_array($cached_data)) {
+            return $cached_data;
+        }
+
         if (!$this->check_connection()) {
             return null;
         }
@@ -3453,14 +3591,14 @@
         if ($this->get_capability('METADATA') ||
             (!strlen($folder) && $this->get_capability('METADATA-SERVER'))
         ) {
-            return $this->conn->getMetadata($folder, $entries, $options);
+            $res = $this->conn->getMetadata($folder, $entries, $options);
         }
         else if ($this->get_capability('ANNOTATEMORE') || $this->get_capability('ANNOTATEMORE2')) {
             $queries = array();
             $res     = array();
 
             // Convert entry names
-            foreach ((array)$entries as $entry) {
+            foreach ($entries as $entry) {
                 list($ent, $attr) = $this->md2annotate($entry);
                 $queries[$attr][] = $ent;
             }
@@ -3471,7 +3609,10 @@
                     $res = array_merge_recursive($res, $result);
                 }
             }
+        }
 
+        if (isset($res)) {
+            $this->update_cache($cache_key, $res);
             return $res;
         }
 
@@ -3508,7 +3649,7 @@
     /**
      * Enable or disable indexes caching
      *
-     * @param string $type Cache type (@see rcmail::get_cache)
+     * @param string $type Cache type (@see rcube::get_cache)
      */
     public function set_caching($type)
     {
@@ -3530,9 +3671,9 @@
     protected function get_cache_engine()
     {
         if ($this->caching && !$this->cache) {
-            $rcmail = rcmail::get_instance();
-            $ttl = $rcmail->config->get('message_cache_lifetime', '10d') - mktime();
-            $this->cache = $rcmail->get_cache('IMAP', $this->caching, $ttl);
+            $rcube = rcube::get_instance();
+            $ttl = $rcube->config->get('message_cache_lifetime', '10d');
+            $this->cache = $rcube->get_cache('IMAP', $this->caching, $ttl);
         }
 
         return $this->cache;
@@ -3585,12 +3726,13 @@
     public function expunge_cache()
     {
         if ($this->mcache) {
-            $ttl = rcmail::get_instance()->config->get('message_cache_lifetime', '10d');
+            $ttl = rcube::get_instance()->config->get('message_cache_lifetime', '10d');
             $this->mcache->expunge($ttl);
         }
 
-        if ($this->cache)
+        if ($this->cache) {
             $this->cache->expunge();
+        }
     }
 
 
@@ -3624,10 +3766,10 @@
     protected function get_mcache_engine()
     {
         if ($this->messages_caching && !$this->mcache) {
-            $rcmail = rcmail::get_instance();
-            if ($dbh = $rcmail->get_dbh()) {
+            $rcube = rcube::get_instance();
+            if (($dbh = $rcube->get_dbh()) && ($userid = $rcube->get_user_id())) {
                 $this->mcache = new rcube_imap_cache(
-                    $dbh, $this, $rcmail->user->ID, $this->options['skip_deleted']);
+                    $dbh, $this, $userid, $this->options['skip_deleted']);
             }
         }
 
@@ -3691,7 +3833,7 @@
                 $a_defaults[$p] = $folder;
             }
             else {
-                $folders[$folder] = rcube_charset_convert($folder, 'UTF7-IMAP');
+                $folders[$folder] = rcube_charset::convert($folder, 'UTF7-IMAP');
             }
         }
 
@@ -3721,12 +3863,12 @@
     protected function rsort($folder, $delimiter, &$list, &$out)
     {
         while (list($key, $name) = each($list)) {
-	        if (strpos($name, $folder.$delimiter) === 0) {
-	            // set the type of folder name variable (#1485527)
-    	        $out[] = (string) $name;
-	            unset($list[$key]);
-	            $this->rsort($name, $delimiter, $list, $out);
-	        }
+            if (strpos($name, $folder.$delimiter) === 0) {
+                // set the type of folder name variable (#1485527)
+                $out[] = (string) $name;
+                unset($list[$key]);
+                $this->rsort($name, $delimiter, $list, $out);
+            }
         }
         reset($list);
     }
@@ -3846,12 +3988,35 @@
 
 
     /**
+     * Converts date string/object into IMAP date/time format
+     */
+    protected function date_format($date)
+    {
+        if (empty($date)) {
+            return null;
+        }
+
+        if (!is_object($date) || !is_a($date, 'DateTime')) {
+            try {
+                $timestamp = rcube_utils::strtotime($date);
+                $date      = new DateTime("@".$timestamp);
+            }
+            catch (Exception $e) {
+                return null;
+            }
+        }
+
+        return $date->format('d-M-Y H:i:s O');
+    }
+
+
+    /**
      * This is our own debug handler for the IMAP connection
      * @access public
      */
     public function debug_handler(&$imap, $message)
     {
-        write_log('imap', $message);
+        rcube::write_log('imap', $message);
     }
 
 
@@ -3904,6 +4069,11 @@
         return $this->list_messages($folder, $page, $sort_field, $sort_order, $slice);
     }
 
+    public function get_headers($uid, $folder = null, $force = false)
+    {
+        return $this->get_message_headers($uid, $folder, $force);
+    }
+
     public function mailbox_status($folder = null)
     {
         return $this->folder_status($folder);
@@ -3949,6 +4119,11 @@
         return $this->delete_folder($folder);
     }
 
+    function clear_mailbox($folder = null)
+    {
+        return $this->clear_folder($folder);
+    }
+
     public function mailbox_exists($folder, $subscription=false)
     {
         return $this->folder_exists($folder, $subscription);

--
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