From ab0b51a1fef87bcc643c3aaf2e635c811b28ccd8 Mon Sep 17 00:00:00 2001
From: alecpl <alec@alec.pl>
Date: Tue, 15 Feb 2011 06:10:59 -0500
Subject: [PATCH] - Use only one from IMAP authentication methods to prevent login delays (1487784)

---
 program/include/rcube_imap.php | 1042 ++++++++++++++++++++++++++++++++++++++++-----------------
 1 files changed, 721 insertions(+), 321 deletions(-)

diff --git a/program/include/rcube_imap.php b/program/include/rcube_imap.php
index cd0ac20..f5a9368 100644
--- a/program/include/rcube_imap.php
+++ b/program/include/rcube_imap.php
@@ -5,7 +5,7 @@
  | program/include/rcube_imap.php                                        |
  |                                                                       |
  | This file is part of the Roundcube Webmail client                     |
- | Copyright (C) 2005-2010, Roundcube Dev. - Switzerland                 |
+ | Copyright (C) 2005-2010, The Roundcube Dev Team                       |
  | Licensed under the GNU GPL                                            |
  |                                                                       |
  | PURPOSE:                                                              |
@@ -33,10 +33,8 @@
 {
     public $debug_level = 1;
     public $skip_deleted = false;
-    public $root_dir = '';
     public $page_size = 10;
     public $list_page = 1;
-    public $delimiter = NULL;
     public $threading = false;
     public $fetch_add_headers = '';
     public $get_all_headers = false;
@@ -54,8 +52,9 @@
      * @var rcube_mdb2
      */
     private $db;
-    private $root_ns = '';
     private $mailbox = 'INBOX';
+    private $delimiter = NULL;
+    private $namespace = NULL;
     private $sort_field = '';
     private $sort_order = 'DESC';
     private $caching_enabled = false;
@@ -101,6 +100,16 @@
         'RETURN-PATH',
     );
 
+    const UNKNOWN       = 0;
+    const NOPERM        = 1;
+    const READONLY      = 2;
+    const TRYCREATE     = 3;
+    const INUSE         = 4;
+    const OVERQUOTA     = 5;
+    const ALREADYEXISTS = 6;
+    const NONEXISTENT   = 7;
+    const CONTACTADMIN  = 8;
+
 
     /**
      * Object constructor
@@ -113,7 +122,7 @@
         $this->conn = new rcube_imap_generic();
     }
 
-    
+
     /**
      * Connect to an IMAP server
      *
@@ -139,6 +148,18 @@
 
         $this->options['port'] = $port;
 
+        if ($this->options['debug']) {
+            $this->conn->setDebug(true, array($this, 'debug_handler'));
+
+            $this->options['ident'] = array(
+                'name' => 'Roundcube Webmail',
+                'version' => RCMAIL_VERSION,
+                'php' => PHP_VERSION,
+                'os' => PHP_OS,
+                'command' => $_SERVER['REQUEST_URI'],
+            );
+        }
+
         $attempt = 0;
         do {
             $data = rcmail::get_instance()->plugins->exec_hook('imap_connect',
@@ -156,32 +177,27 @@
         $this->port = $port;
         $this->ssl  = $use_ssl;
 
-        // print trace messages
         if ($this->conn->connected()) {
-            if ($this->conn->message && ($this->debug_level & 8)) {
-                console($this->conn->message);
-            }
-
-            // get server properties
-            if (!empty($this->conn->rootdir))
-                $this->set_rootdir($this->conn->rootdir);
-            if (empty($this->delimiter))
-	            $this->get_hierarchy_delimiter();
-
+            // get namespace and delimiter
+            $this->set_env();
             return true;
         }
         // write error log
         else if ($this->conn->error) {
-            if ($pass && $user)
+            if ($pass && $user) {
+                $message = sprintf("Login failed for %s from %s. %s",
+                    $user, rcmail_remote_ip(), $this->conn->error);
+
                 raise_error(array('code' => 403, 'type' => 'imap',
                     'file' => __FILE__, 'line' => __LINE__,
-                    'message' => $this->conn->error), true, false);
+                    'message' => $message), true, false);
+            }
         }
 
         return false;
     }
 
-    
+
     /**
      * Close IMAP connection
      * Usually done on script shutdown
@@ -190,11 +206,11 @@
      */
     function close()
     {
-        $this->conn->close();
+        $this->conn->closeConnection();
         $this->write_cache();
     }
 
-    
+
     /**
      * Close IMAP connection and re-connect
      * This is used to avoid some strange socket errors when talking to Courier IMAP
@@ -203,11 +219,11 @@
      */
     function reconnect()
     {
-        $this->close();
-        $this->connect($this->host, $this->user, $this->pass, $this->port, $this->ssl);
+        $this->conn->closeConnection();
+        $connected = $this->connect($this->host, $this->user, $this->pass, $this->port, $this->ssl);
 
         // issue SELECT command to restore connection status
-        if ($this->mailbox)
+        if ($connected && strlen($this->mailbox))
             $this->conn->select($this->mailbox);
     }
 
@@ -219,7 +235,7 @@
      */
     function get_error_code()
     {
-        return ($this->conn) ? $this->conn->errornum : 0;
+        return $this->conn->errornum;
     }
 
 
@@ -230,9 +246,50 @@
      */
     function get_error_str()
     {
-        return ($this->conn) ? $this->conn->error : '';
+        return $this->conn->error;
     }
-    
+
+
+    /**
+     * Returns code of last command response
+     *
+     * @return int Response code
+     */
+    function get_response_code()
+    {
+        switch ($this->conn->resultcode) {
+            case 'NOPERM':
+                return self::NOPERM;
+            case 'READ-ONLY':
+                return self::READONLY;
+            case 'TRYCREATE':
+                return self::TRYCREATE;
+            case 'INUSE':
+                return self::INUSE;
+            case 'OVERQUOTA':
+                return self::OVERQUOTA;
+            case 'ALREADYEXISTS':
+                return self::ALREADYEXISTS;
+            case 'NONEXISTENT':
+                return self::NONEXISTENT;
+            case 'CONTACTADMIN':
+                return self::CONTACTADMIN;
+            default:
+                return self::UNKNOWN;
+        }
+    }
+
+
+    /**
+     * Returns last command response
+     *
+     * @return string Response
+     */
+    function get_response_str()
+    {
+        return $this->conn->result;
+    }
+
 
     /**
      * Set options to be used in rcube_imap_generic::connect()
@@ -244,29 +301,7 @@
         $this->options = array_merge($this->options, (array)$opt);
     }
 
-    
-    /**
-     * Set a root folder for the IMAP connection.
-     *
-     * Only folders within this root folder will be displayed
-     * and all folder paths will be translated using this folder name
-     *
-     * @param  string   $root Root folder
-     * @access public
-     */
-    function set_rootdir($root)
-    {
-        if (preg_match('/[.\/]$/', $root)) //(substr($root, -1, 1)==='/')
-            $root = substr($root, 0, -1);
 
-        $this->root_dir = $root;
-        $this->options['rootdir'] = $root;
-
-        if (empty($this->delimiter))
-            $this->get_hierarchy_delimiter();
-    }
-
-    
     /**
      * Set default message charset
      *
@@ -280,7 +315,7 @@
         $this->default_charset = $cs;
     }
 
-    
+
     /**
      * This list of folders will be listed above all other folders
      *
@@ -298,7 +333,7 @@
         }
     }
 
-    
+
     /**
      * Set internal mailbox reference.
      *
@@ -320,7 +355,27 @@
         $this->_clear_messagecount($mailbox);
     }
 
-    
+
+    /**
+     * Forces selection of a mailbox
+     *
+     * @param  string $mailbox Mailbox/Folder name
+     * @access public
+     */
+    function select_mailbox($mailbox=null)
+    {
+        $mailbox = strlen($mailbox) ? $this->mod_mailbox($mailbox) : $this->mailbox;
+
+        $selected = $this->conn->select($mailbox);
+
+        if ($selected && $this->mailbox != $mailbox) {
+            // clear messagecount cache for this mailbox
+            $this->_clear_messagecount($mailbox);
+            $this->mailbox = $mailbox;
+        }
+    }
+
+
     /**
      * Set internal list page
      *
@@ -332,7 +387,7 @@
         $this->list_page = (int)$page;
     }
 
-    
+
     /**
      * Set internal page size
      *
@@ -344,7 +399,7 @@
         $this->page_size = (int)$size;
     }
 
-    
+
     /**
      * Save a set of message ids for future message listing methods
      *
@@ -371,7 +426,7 @@
         $this->search_sorted     = $sorted;
     }
 
-    
+
     /**
      * Return the saved search set as hash array
      * @return array Search set
@@ -387,7 +442,7 @@
 	    );
     }
 
-    
+
     /**
      * Returns the currently used mailbox name
      *
@@ -399,7 +454,7 @@
         return $this->conn->connected() ? $this->mod_mailbox($this->mailbox, 'out') : '';
     }
 
-    
+
     /**
      * Returns the IMAP server's capability
      *
@@ -412,7 +467,7 @@
         return $this->conn->getCapability(strtoupper($cap));
     }
 
-    
+
     /**
      * Sets threading flag to the best supported THREAD algorithm
      *
@@ -424,19 +479,19 @@
     {
         $this->threading = false;
 
-        if ($enable) {
-            if ($this->get_capability('THREAD=REFS'))
+        if ($enable && ($caps = $this->get_capability('THREAD'))) {
+            if (in_array('REFS', $caps))
                 $this->threading = 'REFS';
-            else if ($this->get_capability('THREAD=REFERENCES'))
+            else if (in_array('REFERENCES', $caps))
                 $this->threading = 'REFERENCES';
-            else if ($this->get_capability('THREAD=ORDEREDSUBJECT'))
+            else if (in_array('ORDEREDSUBJECT', $caps))
                 $this->threading = 'ORDEREDSUBJECT';
         }
 
         return $this->threading;
     }
 
-    
+
     /**
      * Checks the PERMANENTFLAGS capability of the current mailbox
      * and returns true if the given flag is supported by the IMAP server
@@ -449,10 +504,10 @@
     {
         $flag = strtoupper($flag);
         $imap_flag = $this->conn->flags[$flag];
-        return (in_array_nocase($imap_flag, $this->conn->permanentflags));
+        return (in_array_nocase($imap_flag, $this->conn->data['PERMANENTFLAGS']));
     }
 
-    
+
     /**
      * Returns the delimiter that is used by the IMAP server for folder separation
      *
@@ -461,16 +516,104 @@
      */
     function get_hierarchy_delimiter()
     {
-        if ($this->conn && empty($this->delimiter))
-            $this->delimiter = $this->conn->getHierarchyDelimiter();
-
-        if (empty($this->delimiter))
-            $this->delimiter = '/';
-
         return $this->delimiter;
     }
 
-    
+
+    /**
+     * Get namespace
+     *
+     * @return  array  Namespace data
+     * @access  public
+     */
+    function get_namespace()
+    {
+        return $this->namespace;
+    }
+
+
+    /**
+     * Sets delimiter and namespaces
+     *
+     * @access private
+     */
+    private function set_env()
+    {
+        if ($this->delimiter !== null && $this->namespace !== null) {
+            return;
+        }
+
+        if (isset($_SESSION['imap_namespace']) && isset($_SESSION['imap_delimiter'])) {
+            $this->namespace = $_SESSION['imap_namespace'];
+            $this->delimiter = $_SESSION['imap_delimiter'];
+            return;
+        }
+
+        $config = rcmail::get_instance()->config;
+        $imap_personal  = $config->get('imap_ns_personal');
+        $imap_other     = $config->get('imap_ns_other');
+        $imap_shared    = $config->get('imap_ns_shared');
+        $imap_delimiter = $config->get('imap_delimiter');
+
+        if (!$this->conn->connected())
+            return;
+
+        $ns = $this->conn->getNamespace();
+
+        // Set namespaces (NAMESPACE supported)
+        if (is_array($ns)) {
+            $this->namespace = $ns;
+        }
+        else {
+            $this->namespace = array(
+                'personal' => NULL,
+                'other'    => NULL,
+                'shared'   => NULL,
+            );
+        }
+
+        if ($imap_delimiter) {
+            $this->delimiter = $imap_delimiter;
+        }
+        if (empty($this->delimiter)) {
+            $this->delimiter = $this->namespace['personal'][0][1];
+        }
+        if (empty($this->delimiter)) {
+            $this->delimiter = $this->conn->getHierarchyDelimiter();
+        }
+        if (empty($this->delimiter)) {
+            $this->delimiter = '/';
+        }
+
+        // Overwrite namespaces
+        if ($imap_personal !== null) {
+            $this->namespace['personal'] = NULL;
+            foreach ((array)$imap_personal as $dir) {
+                $this->namespace['personal'][] = array($dir, $this->delimiter);
+            }
+        }
+        if ($imap_other !== null) {
+            $this->namespace['other'] = NULL;
+            foreach ((array)$imap_other as $dir) {
+                if ($dir) {
+                    $this->namespace['other'][] = array($dir, $this->delimiter);
+                }
+            }
+        }
+        if ($imap_shared !== null) {
+            $this->namespace['shared'] = NULL;
+            foreach ((array)$imap_shared as $dir) {
+                if ($dir) {
+                    $this->namespace['shared'][] = array($dir, $this->delimiter);
+                }
+            }
+        }
+
+        $_SESSION['imap_namespace'] = $this->namespace;
+        $_SESSION['imap_delimiter'] = $this->delimiter;
+    }
+
+
     /**
      * Get message count for a specific mailbox
      *
@@ -484,11 +627,11 @@
      */
     function messagecount($mbox_name='', $mode='ALL', $force=false, $status=true)
     {
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
         return $this->_messagecount($mailbox, $mode, $force, $status);
     }
 
-    
+
     /**
      * Private method for getting nr of messages
      *
@@ -505,7 +648,7 @@
     {
         $mode = strtoupper($mode);
 
-        if (empty($mailbox))
+        if (!strlen($mailbox))
             $mailbox = $this->mailbox;
 
         // count search set
@@ -526,32 +669,52 @@
             $a_mailbox_cache[$mailbox] = array();
 
         if ($mode == 'THREADS') {
-            $count = $this->_threadcount($mailbox, $msg_count);
+            $res   = $this->_threadcount($mailbox, $msg_count);
+            $count = $res['count'];
+
             if ($status) {
-                $this->set_folder_stats($mailbox, 'cnt', $msg_count);
-                $this->set_folder_stats($mailbox, 'maxuid', $msg_count ? $this->_id2uid($msg_count, $mailbox) : 0);
+                $this->set_folder_stats($mailbox, 'cnt', $res['msgcount']);
+                $this->set_folder_stats($mailbox, 'maxuid', $res['maxuid'] ? $this->_id2uid($res['maxuid'], $mailbox) : 0);
             }
         }
         // RECENT count is fetched a bit different
         else if ($mode == 'RECENT') {
-            $count = $this->conn->checkForRecent($mailbox);
+            $count = $this->conn->countRecent($mailbox);
         }
         // use SEARCH for message counting
         else if ($this->skip_deleted) {
             $search_str = "ALL UNDELETED";
+            $keys       = array('COUNT');
+            $need_uid   = false;
 
-            // get message count and store in cache
-            if ($mode == 'UNSEEN')
+            if ($mode == 'UNSEEN') {
                 $search_str .= " UNSEEN";
-            // get message count using SEARCH
+            }
+            else {
+                if ($this->caching_enabled) {
+                    $keys[] = 'ALL';
+                }
+                if ($status) {
+                    $keys[]   = 'MAX';
+                    $need_uid = true;
+                }
+            }
+
+            // get message count using (E)SEARCH
             // not very performant but more precise (using UNDELETED)
-            $index = $this->conn->search($mailbox, $search_str);
+            $index = $this->conn->search($mailbox, $search_str, $need_uid, $keys);
 
-            $count = is_array($index) ? count($index) : 0;
+            $count = is_array($index) ? $index['COUNT'] : 0;
 
-            if ($mode == 'ALL' && $status) {
-                $this->set_folder_stats($mailbox, 'cnt', $count);
-                $this->set_folder_stats($mailbox, 'maxuid', $index ? $this->_id2uid(max($index), $mailbox) : 0);
+            if ($mode == 'ALL') {
+                if ($need_uid && $this->caching_enabled) {
+                    // Save messages index for check_cache_status()
+                    $this->icache['all_undeleted_idx'] = $index['ALL'];
+                }
+                if ($status) {
+                    $this->set_folder_stats($mailbox, 'cnt', $count);
+                    $this->set_folder_stats($mailbox, 'maxuid', is_array($index) ? $index['MAX'] : 0);
+                }
             }
         }
         else {
@@ -579,25 +742,33 @@
      * Private method for getting nr of threads
      *
      * @param string $mailbox   Folder name
-     * @param int    $msg_count Number of messages in the folder
+     *
+     * @returns array Array containing items: 'count' - threads count,
+     *                'msgcount' = messages count, 'maxuid' = max. UID in the set
      * @access  private
-     * @see     rcube_imap::messagecount()
      */
-    private function _threadcount($mailbox, &$msg_count)
+    private function _threadcount($mailbox)
     {
+        $result = array();
+
         if (!empty($this->icache['threads'])) {
-            $msg_count = count($this->icache['threads']['depth']);
-            return count($this->icache['threads']['tree']);
+            $dcount = count($this->icache['threads']['depth']);
+            $result = array(
+                'count'    => count($this->icache['threads']['tree']),
+                'msgcount' => $dcount,
+                'maxuid'   => $dcount ? max(array_keys($this->icache['threads']['depth'])) : 0,
+            );
+        }
+        else if (is_array($result = $this->_fetch_threads($mailbox))) {
+            $dcount = count($result[1]);
+            $result = array(
+                'count'    => count($result[0]),
+                'msgcount' => $dcount,
+                'maxuid'   => $dcount ? max(array_keys($result[1])) : 0,
+            );
         }
 
-        if (is_array($result = $this->_fetch_threads($mailbox))) {
-            $thread_tree = array_shift($result);
-            $msg_count = count($result[0]);
-        }
-
-//        list ($thread_tree, $msg_depth, $has_children) = $result;
-//        $this->update_thread_cache($mailbox, $thread_tree, $msg_depth, $has_children);
-        return count($thread_tree);
+        return $result;
     }
 
 
@@ -615,7 +786,7 @@
      */
     function list_headers($mbox_name='', $page=NULL, $sort_field=NULL, $sort_order=NULL, $slice=0)
     {
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
         return $this->_list_headers($mailbox, $page, $sort_field, $sort_order, false, $slice);
     }
 
@@ -795,14 +966,14 @@
     {
         if (empty($this->icache['threads'])) {
             // get all threads
-            list ($thread_tree, $msg_depth, $has_children) = $this->conn->thread(
-                $mailbox, $this->threading, $this->skip_deleted ? 'UNDELETED' : '');
+            $result = $this->conn->thread($mailbox, $this->threading,
+                $this->skip_deleted ? 'UNDELETED' : '');
 
             // add to internal (fast) cache
             $this->icache['threads'] = array();
-            $this->icache['threads']['tree'] = $thread_tree;
-            $this->icache['threads']['depth'] = $msg_depth;
-            $this->icache['threads']['has_children'] = $has_children;
+            $this->icache['threads']['tree'] = is_array($result) ? $result[0] : array();
+            $this->icache['threads']['depth'] = is_array($result) ? $result[1] : array();
+            $this->icache['threads']['has_children'] = is_array($result) ? $result[2] : array();
         }
 
         return array(
@@ -842,7 +1013,7 @@
         // flatten threads array
         // @TODO: fetch children only in expanded mode (?)
         $all_ids = array();
-        foreach($msg_index as $root) {
+        foreach ($msg_index as $root) {
             $all_ids[] = $root;
             if (!empty($thread_tree[$root]))
                 $all_ids = array_merge($all_ids, array_keys_recursive($thread_tree[$root]));
@@ -1180,7 +1351,7 @@
      */
     function mailbox_status($mbox_name = null)
     {
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
         $old = $this->get_folder_stats($mailbox);
 
         // refresh message count -> will update
@@ -1247,11 +1418,11 @@
 
         $this->_set_sort_order($sort_field, $sort_order);
 
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
         $key = "{$mailbox}:{$this->sort_field}:{$this->sort_order}:{$this->search_string}.msgi";
 
         // we have a saved search result, get index from there
-        if (!isset($this->cache[$key]) && $this->search_string
+        if (!isset($this->icache[$key]) && $this->search_string
             && !$this->search_threads && $mailbox == $this->mailbox) {
             // use message index sort as default sorting
             if (!$this->sort_field) {
@@ -1261,9 +1432,9 @@
                     sort($msgs);
 
                 if ($this->sort_order == 'DESC')
-                    $this->cache[$key] = array_reverse($msgs);
+                    $this->icache[$key] = array_reverse($msgs);
                 else
-                    $this->cache[$key] = $msgs;
+                    $this->icache[$key] = $msgs;
             }
             // sort with SORT command
             else if ($this->search_sorted) {
@@ -1271,9 +1442,9 @@
                     $this->search('', $this->search_string, $this->search_charset, $this->sort_field);
 
                 if ($this->sort_order == 'DESC')
-                    $this->cache[$key] = array_reverse($this->search_set);
+                    $this->icache[$key] = array_reverse($this->search_set);
                 else
-                    $this->cache[$key] = $this->search_set;
+                    $this->icache[$key] = $this->search_set;
             }
             else {
                 $a_index = $this->conn->fetchHeaderIndex($mailbox,
@@ -1285,17 +1456,17 @@
                     else if ($this->sort_order=="DESC")
                         arsort($a_index);
 
-                    $this->cache[$key] = array_keys($a_index);
+                    $this->icache[$key] = array_keys($a_index);
                 }
                 else {
-                    $this->cache[$key] = array();
+                    $this->icache[$key] = array();
                 }
             }
         }
 
         // have stored it in RAM
-        if (isset($this->cache[$key]))
-            return $this->cache[$key];
+        if (isset($this->icache[$key]))
+            return $this->icache[$key];
 
         // check local cache
         $cache_key = $mailbox.'.msg';
@@ -1319,7 +1490,7 @@
             if ($a_index !== false && $this->sort_order == 'DESC')
                 $a_index = array_reverse($a_index);
 
-            $this->cache[$key] = $a_index;
+            $this->icache[$key] = $a_index;
         }
         // fetch complete message index
         else if ($this->get_capability('SORT') &&
@@ -1329,7 +1500,7 @@
             if ($this->sort_order == 'DESC')
                 $a_index = array_reverse($a_index);
 
-            $this->cache[$key] = $a_index;
+            $this->icache[$key] = $a_index;
         }
         else if ($a_index = $this->conn->fetchHeaderIndex(
             $mailbox, "1:*", $this->sort_field, $this->skip_deleted)) {
@@ -1338,10 +1509,10 @@
             else if ($this->sort_order=="DESC")
                 arsort($a_index);
 
-            $this->cache[$key] = array_keys($a_index);
+            $this->icache[$key] = array_keys($a_index);
         }
 
-        return $this->cache[$key] !== false ? $this->cache[$key] : array();
+        return $this->icache[$key] !== false ? $this->icache[$key] : array();
     }
 
 
@@ -1357,20 +1528,20 @@
     {
         $this->_set_sort_order($sort_field, $sort_order);
 
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
         $key = "{$mailbox}:{$this->sort_field}:{$this->sort_order}:{$this->search_string}.thi";
 
         // we have a saved search result, get index from there
-        if (!isset($this->cache[$key]) && $this->search_string
+        if (!isset($this->icache[$key]) && $this->search_string
             && $this->search_threads && $mailbox == $this->mailbox) {
             // use message IDs for better performance
             $ids = array_keys_recursive($this->search_set['tree']);
-            $this->cache[$key] = $this->_flatten_threads($mailbox, $this->search_set['tree'], $ids);
+            $this->icache[$key] = $this->_flatten_threads($mailbox, $this->search_set['tree'], $ids);
         }
 
         // have stored it in RAM
-        if (isset($this->cache[$key]))
-            return $this->cache[$key];
+        if (isset($this->icache[$key]))
+            return $this->icache[$key];
 /*
         // check local cache
         $cache_key = $mailbox.'.msg';
@@ -1385,9 +1556,9 @@
         // get all threads (default sort order)
         list ($thread_tree) = $this->_fetch_threads($mailbox);
 
-        $this->cache[$key] = $this->_flatten_threads($mailbox, $thread_tree);
+        $this->icache[$key] = $this->_flatten_threads($mailbox, $thread_tree);
 
-        return $this->cache[$key];
+        return $this->icache[$key];
     }
 
 
@@ -1414,7 +1585,7 @@
 
         // flatten threads array
         $all_ids = array();
-        foreach($msg_index as $root) {
+        foreach ($msg_index as $root) {
             $all_ids[] = $root;
             if (!empty($thread_tree[$root])) {
                 foreach (array_keys_recursive($thread_tree[$root]) as $val)
@@ -1534,7 +1705,7 @@
         if (!$str)
             return false;
 
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
 
         $results = $this->_search_index($mailbox, $str, $charset, $sort_field);
 
@@ -1583,7 +1754,7 @@
 
             return $a_messages;
         }
-        
+
         if ($sort_field && $this->get_capability('SORT')) {
             $charset = $charset ? $charset : $this->default_charset;
             $a_messages = $this->conn->sort($mailbox, $sort_field, $criteria, false, $charset);
@@ -1639,7 +1810,7 @@
         if (!$str)
             return false;
 
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
 
         return $this->conn->search($mailbox, $str, $ret_uid);
     }
@@ -1816,7 +1987,7 @@
      */
     function get_headers($id, $mbox_name=NULL, $is_uid=true, $bodystr=false)
     {
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
         $uid = $is_uid ? $id : $this->_id2uid($id, $mailbox);
 
         // get cached headers
@@ -1891,7 +2062,7 @@
                 return false;
         }
 
-        $struct = &$this->_structure_part($structure);
+        $struct = &$this->_structure_part($structure, 0, '', $headers);
         $struct->headers = get_object_vars($headers);
 
         // don't trust given content-type
@@ -2023,6 +2194,11 @@
                 $struct->charset = $struct->ctype_parameters['charset'];
         }
 
+        // #1487700: workaround for lack of charset in malformed structure
+        if (empty($struct->charset) && !empty($mime_headers) && $mime_headers->charset) {
+            $struct->charset = $mime_headers->charset;
+        }
+
         // read content encoding
         if (!empty($part[5]) && $part[5]!='NIL') {
             $struct->encoding = strtolower($part[5]);
@@ -2071,7 +2247,11 @@
                 $mime_headers = $this->conn->fetchPartHeader(
                     $this->mailbox, $this->_msg_id, false, $struct->mime_id);
             }
-            $struct->headers = $this->_parse_headers($mime_headers) + $struct->headers;
+
+            if (is_string($mime_headers))
+                $struct->headers = $this->_parse_headers($mime_headers) + $struct->headers;
+            else if (is_object($mime_headers))
+                $struct->headers = get_object_vars($mime_headers) + $struct->headers;
 
             // get real content-type of message/rfc822
             if ($struct->mimetype == 'message/rfc822') {
@@ -2267,20 +2447,21 @@
 
         // TODO: Add caching for message parts
 
-        if (!$part) $part = 'TEXT';
+        if (!$part) {
+            $part = 'TEXT';
+        }
 
         $body = $this->conn->handlePartBody($this->mailbox, $uid, true, $part,
             $o_part->encoding, $print, $fp);
 
-        if ($fp || $print)
+        if ($fp || $print) {
             return true;
+        }
 
-        // convert charset (if text or message part)
-        if ($body && ($o_part->ctype_primary == 'text' || $o_part->ctype_primary == 'message')) {
-            // assume default if no charset specified
-            if (empty($o_part->charset) || strtolower($o_part->charset) == 'us-ascii')
-                $o_part->charset = $this->default_charset;
-
+        // convert charset (if text or message part) and part's charset is specified
+        if ($body && $o_part->charset
+            && preg_match('/^(text|message)$/', $o_part->ctype_primary)
+        ) {
             $body = rcube_charset_convert($body, $o_part->charset);
         }
 
@@ -2345,11 +2526,11 @@
      * @param string  $flag       Flag to set: SEEN, UNDELETED, DELETED, RECENT, ANSWERED, DRAFT, MDNSENT
      * @param string  $mbox_name  Folder name
      * @param boolean $skip_cache True to skip message cache clean up
-     * @return int    Number of flagged messages, -1 on failure
+     * @return boolean  Operation status
      */
     function set_flag($uids, $flag, $mbox_name=NULL, $skip_cache=false)
     {
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
 
         $flag = strtoupper($flag);
         list($uids, $all_mode) = $this->_parse_uids($uids, $mailbox);
@@ -2359,7 +2540,7 @@
         else
             $result = $this->conn->flag($mailbox, $uids, $flag);
 
-        if ($result >= 0) {
+        if ($result) {
             // reload message headers if cached
             if ($this->caching_enabled && !$skip_cache) {
                 $cache_key = $mailbox.'.msg';
@@ -2368,13 +2549,15 @@
                 else
                     $this->remove_message_cache($cache_key, explode(',', $uids));
             }
-            // update counters
-            if ($flag=='SEEN')
-                $this->_set_messagecount($mailbox, 'UNSEEN', $result*(-1));
-            else if ($flag=='UNSEEN')
-                $this->_set_messagecount($mailbox, 'UNSEEN', $result);
-            else if ($flag=='DELETED')
-                $this->_set_messagecount($mailbox, 'ALL', $result*(-1));
+
+            // clear cached counters
+            if ($flag == 'SEEN' || $flag == 'UNSEEN') {
+                $this->_clear_messagecount($mailbox, 'SEEN');
+                $this->_clear_messagecount($mailbox, 'UNSEEN');
+            }
+            else if ($flag == 'DELETED') {
+                $this->_clear_messagecount($mailbox, 'DELETED');
+            }
         }
 
         return $result;
@@ -2411,7 +2594,7 @@
         $mailbox = $this->mod_mailbox($mbox_name);
 
         // make sure mailbox exists
-        if ($this->mailbox_exists($mbox_name, true)) {
+        if ($this->mailbox_exists($mbox_name)) {
             if ($is_file)
                 $saved = $this->conn->appendFromFile($mailbox, $message, $headers);
             else
@@ -2440,7 +2623,10 @@
         $fbox = $from_mbox;
         $tbox = $to_mbox;
         $to_mbox = $this->mod_mailbox($to_mbox);
-        $from_mbox = $from_mbox ? $this->mod_mailbox($from_mbox) : $this->mailbox;
+        $from_mbox = strlen($from_mbox) ? $this->mod_mailbox($from_mbox) : $this->mailbox;
+
+        if ($to_mbox === $from_mbox)
+            return false;
 
         list($uids, $all_mode) = $this->_parse_uids($uids, $from_mbox);
 
@@ -2449,7 +2635,7 @@
             return false;
 
         // make sure mailbox exists
-        if ($to_mbox != 'INBOX' && !$this->mailbox_exists($tbox, true)) {
+        if ($to_mbox != 'INBOX' && !$this->mailbox_exists($tbox)) {
             if (in_array($tbox, $this->default_folders))
                 $this->create_mailbox($tbox, true);
             else
@@ -2464,8 +2650,7 @@
         }
 
         // move messages
-        $move = $this->conn->move($uids, $from_mbox, $to_mbox);
-        $moved = !($move === false || $move < 0);
+        $moved = $this->conn->move($uids, $from_mbox, $to_mbox);
 
         // send expunge command in order to have the moved message
         // really deleted from the source mailbox
@@ -2526,11 +2711,12 @@
         list($uids, $all_mode) = $this->_parse_uids($uids, $from_mbox);
 
         // exit if no message uids are specified
-        if (empty($uids))
+        if (empty($uids)) {
             return false;
+        }
 
         // make sure mailbox exists
-        if ($to_mbox != 'INBOX' && !$this->mailbox_exists($tbox, true)) {
+        if ($to_mbox != 'INBOX' && !$this->mailbox_exists($tbox)) {
             if (in_array($tbox, $this->default_folders))
                 $this->create_mailbox($tbox, true);
             else
@@ -2538,8 +2724,7 @@
         }
 
         // copy messages
-        $copy = $this->conn->copy($uids, $from_mbox, $to_mbox);
-        $copied = !($copy === false || $copy < 0);
+        $copied = $this->conn->copy($uids, $from_mbox, $to_mbox);
 
         if ($copied) {
             $this->_clear_messagecount($to_mbox);
@@ -2558,7 +2743,7 @@
      */
     function delete_message($uids, $mbox_name='')
     {
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
 
         list($uids, $all_mode) = $this->_parse_uids($uids, $mailbox);
 
@@ -2611,14 +2796,12 @@
      */
     function clear_mailbox($mbox_name=NULL)
     {
-        $mailbox = !empty($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
-        $msg_count = $this->_messagecount($mailbox, 'ALL');
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
 
-        if (!$msg_count) {
-            return 0;
+        // SELECT will set messages count for clearFolder()
+        if ($this->conn->select($mailbox)) {
+            $cleared = $this->conn->clearFolder($mailbox);
         }
-
-        $cleared = $this->conn->clearFolder($mailbox);
 
         // make sure the message count cache is cleared as well
         if ($cleared) {
@@ -2641,7 +2824,7 @@
      */
     function expunge($mbox_name='', $clear_cache=true)
     {
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
         return $this->_expunge($mailbox, $clear_cache);
     }
 
@@ -2663,9 +2846,25 @@
         else
             $a_uids = NULL;
 
-        $result = $this->conn->expunge($mailbox, $a_uids);
+        // force mailbox selection and check if mailbox is writeable
+        // to prevent a situation when CLOSE is executed on closed
+        // or EXPUNGE on read-only mailbox
+        $result = $this->conn->select($mailbox);
+        if (!$result) {
+            return false;
+        }
+        if (!$this->conn->data['READ-WRITE']) {
+            $this->conn->setError(rcube_imap_generic::ERROR_READONLY, "Mailbox is read-only");
+            return false;
+        }
 
-        if ($result>=0 && $clear_cache) {
+        // CLOSE(+SELECT) should be faster than EXPUNGE
+        if (empty($a_uids) || $a_uids == '1:*')
+            $result = $this->conn->close();
+        else
+            $result = $this->conn->expunge($mailbox, $a_uids);
+
+        if ($result && $clear_cache) {
             $this->clear_message_cache($mailbox.'.msg');
             $this->_clear_messagecount($mailbox);
         }
@@ -2726,7 +2925,7 @@
      */
     function get_id($uid, $mbox_name=NULL)
     {
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
         return $this->_uid2id($uid, $mailbox);
     }
 
@@ -2738,9 +2937,9 @@
      * @param string $mbox_name Mailbox name
      * @return int   Message UID
      */
-    function get_uid($id,$mbox_name=NULL)
+    function get_uid($id, $mbox_name=NULL)
     {
-        $mailbox = $mbox_name ? $this->mod_mailbox($mbox_name) : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $this->mod_mailbox($mbox_name) : $this->mailbox;
         return $this->_id2uid($id, $mailbox);
     }
 
@@ -2766,7 +2965,7 @@
         $a_mboxes = $this->_list_mailboxes($root, $filter);
 
         foreach ($a_mboxes as $idx => $mbox_row) {
-            if ($name = $this->mod_mailbox($mbox_row, 'out'))
+            if (strlen($name = $this->mod_mailbox($mbox_row, 'out')))
                 $a_out[] = $name;
             unset($a_mboxes[$idx]);
         }
@@ -2808,8 +3007,29 @@
             $a_folders = $data['folders'];
         }
         else {
-            // retrieve list of folders from IMAP server
-            $a_folders = $this->conn->listSubscribed($this->mod_mailbox($root), $filter);
+            // 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 mailbox options, LSUB doesn't do that
+                $a_folders = $this->conn->listMailboxes($this->mod_mailbox($root), $filter,
+                    NULL, array('SUBSCRIBED'));
+
+                // remove non-existent folders
+                if (is_array($a_folders)) {
+                    foreach ($a_folders as $idx => $folder) {
+                        if ($this->conn->data['LIST'] && ($opts = $this->conn->data['LIST'][$folder])
+                            && in_array('\\NonExistent', $opts)
+                        ) {
+                            unset($a_folders[$idx]);
+                        } 
+                    }
+                }
+            }
+            // retrieve list of folders from IMAP server using LSUB
+            else {
+                $a_folders = $this->conn->listSubscribed($this->mod_mailbox($root), $filter);
+            }
         }
 
         if (!is_array($a_folders) || !sizeof($a_folders))
@@ -2849,7 +3069,7 @@
 
         // modify names with root dir
         foreach ($a_mboxes as $idx => $mbox_name) {
-            if ($name = $this->mod_mailbox($mbox_name, 'out'))
+            if (strlen($name = $this->mod_mailbox($mbox_name, 'out')))
                 $a_folders[] = $name;
             unset($a_mboxes[$idx]);
         }
@@ -2876,6 +3096,26 @@
             return $this->conn->getQuota();
 
         return false;
+    }
+
+
+    /**
+     * Get mailbox size (size of all messages in a mailbox)
+     *
+     * @param string $name Mailbox name
+     * @return int Mailbox size in bytes, False on error
+     */
+    function get_mailbox_size($name)
+    {
+        $name = $this->mod_mailbox($name);
+
+        // @TODO: could we try to use QUOTA here?
+        $result = $this->conn->fetchHeaderIndex($name, '1:*', 'SIZE', false);
+
+        if (is_array($result))
+            $result = array_sum($result);
+
+        return $result;
     }
 
 
@@ -2914,129 +3154,120 @@
     /**
      * Create a new mailbox on the server and register it in local cache
      *
-     * @param string  $name      New mailbox name (as utf-7 string)
+     * @param string  $name      New mailbox name
      * @param boolean $subscribe True if the new mailbox should be subscribed
-     * @param string  Name of the created mailbox, false on error
+     * @param boolean True on success
      */
     function create_mailbox($name, $subscribe=false)
     {
-        $result = false;
-
-        // reduce mailbox name to 100 chars
-        $name = substr($name, 0, 100);
+        $result   = false;
         $abs_name = $this->mod_mailbox($name);
-        $result = $this->conn->createFolder($abs_name);
+        $result   = $this->conn->createFolder($abs_name);
 
         // try to subscribe it
         if ($result && $subscribe)
             $this->subscribe($name);
 
-        return $result ? $name : false;
+        return $result;
     }
 
 
     /**
      * Set a new name to an existing mailbox
      *
-     * @param string $mbox_name Mailbox to rename (as utf-7 string)
-     * @param string $new_name  New mailbox name (as utf-7 string)
-     * @return string Name of the renames mailbox, False on error
+     * @param string $mbox_name Mailbox to rename
+     * @param string $new_name  New mailbox name
+     *
+     * @return boolean True on success
      */
     function rename_mailbox($mbox_name, $new_name)
     {
         $result = false;
 
-        // encode mailbox name and reduce it to 100 chars
-        $name = substr($new_name, 0, 100);
-
         // make absolute path
-        $mailbox = $this->mod_mailbox($mbox_name);
-        $abs_name = $this->mod_mailbox($name);
+        $mailbox  = $this->mod_mailbox($mbox_name);
+        $abs_name = $this->mod_mailbox($new_name);
+        $delm     = $this->get_hierarchy_delimiter();
 
-        // check if mailbox is subscribed
-        $a_subscribed = $this->_list_mailboxes();
-        $subscribed = in_array($mailbox, $a_subscribed);
-
-        // unsubscribe folder
-        if ($subscribed)
-            $this->conn->unsubscribe($mailbox);
+        // get list of subscribed folders
+        if ((strpos($mailbox, '%') === false) && (strpos($mailbox, '*') === false)) {
+            $a_subscribed = $this->_list_mailboxes('', $mbox_name . $delm . '*');
+            $subscribed   = $this->mailbox_exists($mbox_name, true);
+        }
+        else {
+            $a_subscribed = $this->_list_mailboxes();
+            $subscribed   = in_array($mailbox, $a_subscribed);
+        }
 
         if (strlen($abs_name))
             $result = $this->conn->renameFolder($mailbox, $abs_name);
 
         if ($result) {
-            $delm = $this->get_hierarchy_delimiter();
+            // unsubscribe the old folder, subscribe the new one
+            if ($subscribed) {
+                $this->conn->unsubscribe($mailbox);
+                $this->conn->subscribe($abs_name);
+            }
 
             // check if mailbox children are subscribed
-            foreach ($a_subscribed as $c_subscribed)
+            foreach ($a_subscribed as $c_subscribed) {
                 if (preg_match('/^'.preg_quote($mailbox.$delm, '/').'/', $c_subscribed)) {
                     $this->conn->unsubscribe($c_subscribed);
                     $this->conn->subscribe(preg_replace('/^'.preg_quote($mailbox, '/').'/',
                         $abs_name, $c_subscribed));
                 }
+            }
 
             // clear cache
             $this->clear_message_cache($mailbox.'.msg');
             $this->clear_cache('mailboxes');
         }
 
-        // try to subscribe it
-        if ($result && $subscribed)
-            $this->conn->subscribe($abs_name);
-
-        return $result ? $name : false;
+        return $result;
     }
 
 
     /**
-     * Remove mailboxes from server
+     * Remove mailbox from server
      *
-     * @param string|array $mbox_name sMailbox name(s) string/array
+     * @param string $mbox_name Mailbox name
+     *
      * @return boolean True on success
      */
     function delete_mailbox($mbox_name)
     {
-        $deleted = false;
+        $result  = false;
+        $mailbox = $this->mod_mailbox($mbox_name);
+        $delm    = $this->get_hierarchy_delimiter();
 
-        if (is_array($mbox_name))
-            $a_mboxes = $mbox_name;
-        else if (is_string($mbox_name) && strlen($mbox_name))
-            $a_mboxes = explode(',', $mbox_name);
+        // get list of folders
+        if ((strpos($mailbox, '%') === false) && (strpos($mailbox, '*') === false))
+            $sub_mboxes = $this->list_unsubscribed('', $mailbox . $delm . '*');
+        else
+            $sub_mboxes = $this->list_unsubscribed();
 
-        if (is_array($a_mboxes)) {
-            foreach ($a_mboxes as $mbox_name) {
-                $mailbox = $this->mod_mailbox($mbox_name);
-                $sub_mboxes = $this->conn->listMailboxes($this->mod_mailbox(''),
-	                $mbox_name . $this->delimiter . '*');
+        // send delete command to server
+        $result = $this->conn->deleteFolder($mailbox);
 
-                // unsubscribe mailbox before deleting
-                $this->conn->unsubscribe($mailbox);
+        if ($result) {
+            // unsubscribe mailbox
+            $this->conn->unsubscribe($mailbox);
 
-                // send delete command to server
-                $result = $this->conn->deleteFolder($mailbox);
-                if ($result) {
-                    $deleted = true;
-                    $this->clear_message_cache($mailbox.'.msg');
-	            }
-
-                foreach ($sub_mboxes as $c_mbox) {
-                    if ($c_mbox != 'INBOX') {
-                        $this->conn->unsubscribe($c_mbox);
-                        $result = $this->conn->deleteFolder($c_mbox);
-                        if ($result) {
-                            $deleted = true;
-    	                    $this->clear_message_cache($c_mbox.'.msg');
-                        }
+            foreach ($sub_mboxes as $c_mbox) {
+                if (preg_match('/^'.preg_quote($mailbox.$delm, '/').'/', $c_mbox)) {
+                    $this->conn->unsubscribe($c_mbox);
+                    if ($this->conn->deleteFolder($c_mbox)) {
+	                    $this->clear_message_cache($c_mbox.'.msg');
                     }
                 }
             }
+
+            // clear mailbox-related cache
+            $this->clear_message_cache($mailbox.'.msg');
+            $this->clear_cache('mailboxes');
         }
 
-        // clear mailboxlist cache
-        if ($deleted)
-            $this->clear_cache('mailboxes');
-
-        return $deleted;
+        return $result;
     }
 
 
@@ -3064,25 +3295,25 @@
      */
     function mailbox_exists($mbox_name, $subscription=false)
     {
-        if ($mbox_name) {
-            if ($mbox_name == 'INBOX')
-                return true;
+        if ($mbox_name == 'INBOX')
+            return true;
 
-            $key = $subscription ? 'subscribed' : 'existing';
-            if (is_array($this->icache[$key]) && in_array($mbox_name, $this->icache[$key]))
-                return true;
+        $key  = $subscription ? 'subscribed' : 'existing';
+        $mbox = $this->mod_mailbox($mbox_name);
 
-            if ($subscription) {
-                $a_folders = $this->conn->listSubscribed($this->mod_mailbox(''), $mbox_name);
-            }
-            else {
-                $a_folders = $this->conn->listMailboxes($this->mod_mailbox(''), $mbox_name);
-	        }
+        if (is_array($this->icache[$key]) && in_array($mbox, $this->icache[$key]))
+            return true;
 
-            if (is_array($a_folders) && in_array($this->mod_mailbox($mbox_name), $a_folders)) {
-                $this->icache[$key][] = $mbox_name;
-                return true;
-            }
+        if ($subscription) {
+            $a_folders = $this->conn->listSubscribed('', $mbox);
+        }
+        else {
+            $a_folders = $this->conn->listMailboxes('', $mbox);
+        }
+
+        if (is_array($a_folders) && in_array($mbox, $a_folders)) {
+            $this->icache[$key][] = $mbox;
+            return true;
         }
 
         return false;
@@ -3098,17 +3329,81 @@
      */
     function mod_mailbox($mbox_name, $mode='in')
     {
-        if ($mbox_name == 'INBOX')
-            return $mbox_name;
+        if (!strlen($mbox_name))
+            return '';
 
-        if (!empty($this->root_dir)) {
-            if ($mode=='in')
-                $mbox_name = $this->root_dir.$this->delimiter.$mbox_name;
-            else if (!empty($mbox_name)) // $mode=='out'
-                $mbox_name = substr($mbox_name, strlen($this->root_dir)+1);
+        if ($mode == 'in') {
+            // If folder contains namespace prefix, don't modify it
+            if (is_array($this->namespace['shared'])) {
+                foreach ($this->namespace['shared'] as $ns) {
+                    if ($ns[0] && strpos($mbox_name, $ns[0]) === 0) {
+                        return $mbox_name;
+                    }
+                }
+            }
+            if (is_array($this->namespace['other'])) {
+                foreach ($this->namespace['other'] as $ns) {
+                    if ($ns[0] && strpos($mbox_name, $ns[0]) === 0) {
+                        return $mbox_name;
+                    }
+                }
+            }
+            if (is_array($this->namespace['personal'])) {
+                foreach ($this->namespace['personal'] as $ns) {
+                    if ($ns[0] && strpos($mbox_name, $ns[0]) === 0) {
+                        return $mbox_name;
+                    }
+                }
+                // Add prefix if first personal namespace is non-empty
+                if ($mbox_name != 'INBOX' && $this->namespace['personal'][0][0]) {
+                    return $this->namespace['personal'][0][0].$mbox_name;
+                }
+            }
+        }
+        else {
+            // Remove prefix if folder is from first ("non-empty") personal namespace
+            if (is_array($this->namespace['personal'])) {
+                if ($prefix = $this->namespace['personal'][0][0]) {
+                    if (strpos($mbox_name, $prefix) === 0) {
+                        return substr($mbox_name, strlen($prefix));
+                    }
+                }
+            }
         }
 
         return $mbox_name;
+    }
+
+
+    /**
+     * Gets folder options from LIST response, e.g. \Noselect, \Noinferiors
+     *
+     * @param string $mbox_name Folder name
+     * @param bool   $force     Set to True if options should be refreshed
+     *                          Options are available after LIST command only
+     *
+     * @return array Options list
+     */
+    function mailbox_options($mbox_name, $force=false)
+    {
+        $mbox = $this->mod_mailbox($mbox_name);
+
+        if ($mbox == 'INBOX') {
+            return array();
+        }
+
+        if (!is_array($this->conn->data['LIST']) || !is_array($this->conn->data['LIST'][$mbox])) {
+            if ($force) {
+                $this->conn->listMailboxes('', $mbox_name);
+            }
+            else {
+                return array();
+            }
+        }
+
+        $opts = $this->conn->data['LIST'][$mbox];
+
+        return is_array($opts) ? $opts : array();
     }
 
 
@@ -3258,8 +3553,8 @@
         if ($mailbox)
             $mailbox = $this->mod_mailbox($mailbox);
 
-        if ($this->get_capability('METADATA') || 
-            empty($mailbox) && $this->get_capability('METADATA-SERVER')
+        if ($this->get_capability('METADATA') ||
+            (!strlen($mailbox) && $this->get_capability('METADATA-SERVER'))
         ) {
             return $this->conn->setMetadata($mailbox, $entries);
         }
@@ -3292,7 +3587,7 @@
             $mailbox = $this->mod_mailbox($mailbox);
 
         if ($this->get_capability('METADATA') || 
-            empty($mailbox) && $this->get_capability('METADATA-SERVER')
+            (!strlen($mailbox) && $this->get_capability('METADATA-SERVER'))
         ) {
             return $this->conn->deleteMetadata($mailbox, $entries);
         }
@@ -3326,7 +3621,7 @@
             $mailbox = $this->mod_mailbox($mailbox);
 
         if ($this->get_capability('METADATA') || 
-            empty($mailbox) && $this->get_capability('METADATA-SERVER')
+            !strlen(($mailbox) && $this->get_capability('METADATA-SERVER'))
         ) {
             return $this->conn->getMetadata($mailbox, $entries, $options);
         }
@@ -3588,45 +3883,43 @@
         $cache_count = count($cache_index);
 
         // empty mailbox
-        if (!$msg_count)
+        if (!$msg_count) {
             return $cache_count ? -2 : 1;
+        }
 
-        if ($cache_count==$msg_count) {
+        if ($cache_count == $msg_count) {
             if ($this->skip_deleted) {
-	            $h_index = $this->conn->fetchHeaderIndex($mailbox, "1:*", 'UID', $this->skip_deleted);
-
-                // Save index in internal cache, will be used when syncing the cache
-                $this->icache['folder_index'] = $h_index;
-
-                if (empty($h_index))
-                    return -2;
-
-	            if (sizeof($h_index) == $cache_count) {
-	                $cache_index = array_flip($cache_index);
-	                foreach ($h_index as $idx => $uid)
-                        unset($cache_index[$uid]);
-
-	                if (empty($cache_index))
-	                    return 1;
-	            }
-	            return -2;
+                if (!empty($this->icache['all_undeleted_idx'])) {
+                    $uids = rcube_imap_generic::uncompressMessageSet($this->icache['all_undeleted_idx']);
+                    $uids = array_flip($uids);
+                    foreach ($cache_index as $uid) {
+                        unset($uids[$uid]);
+                    }
+                }
+                else {
+                    // get all undeleted messages excluding cached UIDs
+                    $uids = $this->search_once($mailbox, 'ALL UNDELETED NOT UID '.
+                        rcube_imap_generic::compressMessageSet($cache_index));
+                }
+                if (empty($uids)) {
+                    return 1;
+                }
             } else {
                 // get UID of the message with highest index
                 $uid = $this->_id2uid($msg_count, $mailbox);
                 $cache_uid = array_pop($cache_index);
 
                 // uids of highest message matches -> cache seems OK
-                if ($cache_uid == $uid)
+                if ($cache_uid == $uid) {
                     return 1;
+                }
             }
             // cache is dirty
             return -1;
         }
+
         // if cache count differs less than 10% report as dirty
-        else if (abs($msg_count - $cache_count) < $msg_count/10)
-            return -1;
-        else
-            return -2;
+        return (abs($msg_count - $cache_count) < $msg_count/10) ? -1 : -2;
     }
 
 
@@ -4000,10 +4293,7 @@
         foreach ($a as $val) {
             $j++;
             $address = trim($val['address']);
-            $name = trim($val['name']);
-
-            if ($name && preg_match('/^[\'"]/', $name) && preg_match('/[\'"]$/', $name))
-                $name = trim($name, '\'"');
+            $name    = trim($val['name']);
 
             if ($name && $address && $name != $address)
                 $string = sprintf('%s <%s>', preg_match("/$special_chars/", $name) ? '"'.addcslashes($name, '"').'"' : $name, $address);
@@ -4262,7 +4552,7 @@
      */
     private function _uid2id($uid, $mbox_name=NULL)
     {
-        if (!$mbox_name)
+        if (!strlen($mbox_name))
             $mbox_name = $this->mailbox;
 
         if (!isset($this->uid_id_map[$mbox_name][$uid])) {
@@ -4284,7 +4574,7 @@
      */
     private function _id2uid($id, $mbox_name=NULL)
     {
-        if (!$mbox_name)
+        if (!strlen($mbox_name))
             $mbox_name = $this->mailbox;
 
         if ($uid = array_search($id, (array)$this->uid_id_map[$mbox_name]))
@@ -4345,7 +4635,7 @@
     private function _set_messagecount($mbox_name, $mode, $increment)
     {
         $a_mailbox_cache = false;
-        $mailbox = $mbox_name ? $mbox_name : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $mbox_name : $this->mailbox;
         $mode = strtoupper($mode);
 
         $a_mailbox_cache = $this->get_cache('messagecount');
@@ -4371,15 +4661,19 @@
      * Remove messagecount of a specific mailbox from cache
      * @access private
      */
-    private function _clear_messagecount($mbox_name='')
+    private function _clear_messagecount($mbox_name='', $mode=null)
     {
-        $a_mailbox_cache = false;
-        $mailbox = $mbox_name ? $mbox_name : $this->mailbox;
+        $mailbox = strlen($mbox_name) ? $mbox_name : $this->mailbox;
 
         $a_mailbox_cache = $this->get_cache('messagecount');
 
         if (is_array($a_mailbox_cache[$mailbox])) {
-            unset($a_mailbox_cache[$mailbox]);
+            if ($mode) {
+                unset($a_mailbox_cache[$mailbox][$mode]);
+            }
+            else {
+                unset($a_mailbox_cache[$mailbox]);
+            }
             $this->update_cache('messagecount', $a_mailbox_cache);
         }
     }
@@ -4415,31 +4709,137 @@
     private function _parse_address_list($str, $decode=true)
     {
         // remove any newlines and carriage returns before
-        $a = rcube_explode_quoted_string('[,;]', preg_replace( "/[\r\n]/", " ", $str));
+        $str = preg_replace('/\r?\n(\s|\t)?/', ' ', $str);
+
+        // extract list items, remove comments
+        $str = self::explode_header_string(',;', $str, true);
         $result = array();
 
-        foreach ($a as $key => $val) {
-            $val = preg_replace("/([\"\w])</", "$1 <", $val);
-            $sub_a = rcube_explode_quoted_string(' ', $decode ? $this->decode_header($val) : $val);
-            $result[$key]['name'] = '';
+        foreach ($str as $key => $val) {
+            $name    = '';
+            $address = '';
+            $val     = trim($val);
 
-            foreach ($sub_a as $k => $v) {
-	            // use angle brackets in regexp to not handle names with @ sign
-                if (preg_match('/^<\S+@\S+>$/', $v))
-                    $result[$key]['address'] = trim($v, '<>');
-                else
-                    $result[$key]['name'] .= (empty($result[$key]['name'])?'':' ').str_replace("\"",'',stripslashes($v));
+            if (preg_match('/(.*)<(\S+@\S+)>$/', $val, $m)) {
+                $address = $m[2];
+                $name    = trim($m[1]);
+            }
+            else if (preg_match('/^(\S+@\S+)$/', $val, $m)) {
+                $address = $m[1];
+                $name    = '';
+            }
+            else {
+                $name = $val;
             }
 
-//          if (empty($result[$key]['name']))
-//              $result[$key]['name'] = $result[$key]['address'];
-            if (empty($result[$key]['address']))
-                $result[$key]['address'] = $result[$key]['name'];
+            // dequote and/or decode name
+            if ($name) {
+                if ($name[0] == '"') {
+                    $name = substr($name, 1, -1);
+                    $name = stripslashes($name);
+                }
+                if ($decode) {
+                    $name = $this->decode_header($name);
+                }
+            }
+
+            if (!$address && $name) {
+                $address = $name;
+            }
+
+            if ($address) {
+                $result[$key] = array('name' => $name, 'address' => $address);
+            }
         }
 
         return $result;
     }
 
+
+    /**
+     * Explodes header (e.g. address-list) string into array of strings
+     * using specified separator characters with proper handling
+     * of quoted-strings and comments (RFC2822)
+     *
+     * @param string $separator       String containing separator characters
+     * @param string $str             Header string
+     * @param bool   $remove_comments Enable to remove comments
+     *
+     * @return array Header items
+     */
+    static function explode_header_string($separator, $str, $remove_comments=false)
+    {
+        $length  = strlen($str);
+        $result  = array();
+        $quoted  = false;
+        $comment = 0;
+        $out     = '';
+
+        for ($i=0; $i<$length; $i++) {
+            // we're inside a quoted string
+            if ($quoted) {
+                if ($str[$i] == '"') {
+                    $quoted = false;
+                }
+                else if ($str[$i] == '\\') {
+                    if ($comment <= 0) {
+                        $out .= '\\';
+                    }
+                    $i++;
+                }
+            }
+            // we're inside a comment string
+            else if ($comment > 0) {
+                    if ($str[$i] == ')') {
+                        $comment--;
+                    }
+                    else if ($str[$i] == '(') {
+                        $comment++;
+                    }
+                    else if ($str[$i] == '\\') {
+                        $i++;
+                    }
+                    continue;
+            }
+            // separator, add to result array
+            else if (strpos($separator, $str[$i]) !== false) {
+                    if ($out) {
+                        $result[] = $out;
+                    }
+                    $out = '';
+                    continue;
+            }
+            // start of quoted string
+            else if ($str[$i] == '"') {
+                    $quoted = true;
+            }
+            // start of comment
+            else if ($remove_comments && $str[$i] == '(') {
+                    $comment++;
+            }
+
+            if ($comment <= 0) {
+                $out .= $str[$i];
+            }
+        }
+
+        if ($out && $comment <= 0) {
+            $result[] = $out;
+        }
+
+        return $result;
+    }
+
+
+    /**
+     * This is our own debug handler for the IMAP connection
+     * @access public
+     */
+    public function debug_handler(&$imap, $message)
+    {
+        write_log('imap', $message);
+    }
+
 }  // end class rcube_imap
 
 

--
Gitblit v1.9.1