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rcube_imap.php
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rcube_imap.php
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<?php
/*
+-----------------------------------------------------------------------+
| program/include/rcube_imap.php |
| |
| This file is part of the Roundcube Webmail client |
| Copyright (C) 2005-2011, The Roundcube Dev Team |
| Copyright (C) 2011, Kolab Systems AG |
| Licensed under the GNU GPL |
| |
| PURPOSE: |
| IMAP Engine |
| |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
| Author: Aleksander Machniak <alec@alec.pl> |
+-----------------------------------------------------------------------+
$Id$
*/
/**
* Interface class for accessing an IMAP server
*
* @package Mail
* @author Thomas Bruederli <roundcube@gmail.com>
* @author Aleksander Machniak <alec@alec.pl>
* @version 2.0
*/
class rcube_imap
{
public $debug_level = 1;
public $skip_deleted = false;
public $page_size = 10;
public $list_page = 1;
public $threading = false;
public $fetch_add_headers = '';
public $get_all_headers = false;
/**
* Instance of rcube_imap_generic
*
* @var rcube_imap_generic
*/
public $conn;
/**
* Instance of rcube_imap_cache
*
* @var rcube_imap_cache
*/
private $mcache;
/**
* Instance of rcube_cache
*
* @var rcube_cache
*/
private $cache;
/**
* Internal (in-memory) cache
*
* @var array
*/
private $icache = array();
private $mailbox = 'INBOX';
private $delimiter = NULL;
private $namespace = NULL;
private $sort_field = '';
private $sort_order = 'DESC';
private $default_charset = 'ISO-8859-1';
private $struct_charset = NULL;
private $default_folders = array('INBOX');
private $uid_id_map = array();
private $msg_headers = array();
public $search_set = NULL;
public $search_string = '';
private $search_charset = '';
private $search_sort_field = '';
private $search_threads = false;
private $search_sorted = false;
private $options = array('auth_method' => 'check');
private $host, $user, $pass, $port, $ssl;
private $caching = false;
private $messages_caching = false;
/**
* All (additional) headers used (in any way) by Roundcube
* Not listed here: DATE, FROM, TO, CC, REPLY-TO, SUBJECT, CONTENT-TYPE, LIST-POST
* (used for messages listing) are hardcoded in rcube_imap_generic::fetchHeaders()
*
* @var array
* @see rcube_imap::fetch_add_headers
*/
private $all_headers = array(
'IN-REPLY-TO',
'BCC',
'MESSAGE-ID',
'CONTENT-TRANSFER-ENCODING',
'REFERENCES',
'X-DRAFT-INFO',
'MAIL-FOLLOWUP-TO',
'MAIL-REPLY-TO',
'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.
*/
function __construct()
{
$this->conn = new rcube_imap_generic();
// Set namespace and delimiter from session,
// so some methods would work before connection
if (isset($_SESSION['imap_namespace']))
$this->namespace = $_SESSION['imap_namespace'];
if (isset($_SESSION['imap_delimiter']))
$this->delimiter = $_SESSION['imap_delimiter'];
}
/**
* Connect to an IMAP server
*
* @param string $host Host to connect
* @param string $user Username for IMAP account
* @param string $pass Password for IMAP account
* @param integer $port Port to connect to
* @param string $use_ssl SSL schema (either ssl or tls) or null if plain connection
* @return boolean TRUE on success, FALSE on failure
* @access public
*/
function connect($host, $user, $pass, $port=143, $use_ssl=null)
{
// check for OpenSSL support in PHP build
if ($use_ssl && extension_loaded('openssl'))
$this->options['ssl_mode'] = $use_ssl == 'imaps' ? 'ssl' : $use_ssl;
else if ($use_ssl) {
raise_error(array('code' => 403, 'type' => 'imap',
'file' => __FILE__, 'line' => __LINE__,
'message' => "OpenSSL not available"), true, false);
$port = 143;
}
$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',
array('host' => $host, 'user' => $user, 'attempt' => ++$attempt));
if (!empty($data['pass']))
$pass = $data['pass'];
$this->conn->connect($data['host'], $data['user'], $pass, $this->options);
} while(!$this->conn->connected() && $data['retry']);
$this->host = $data['host'];
$this->user = $data['user'];
$this->pass = $pass;
$this->port = $port;
$this->ssl = $use_ssl;
if ($this->conn->connected()) {
// get namespace and delimiter
$this->set_env();
return true;
}
// write error log
else if ($this->conn->error) {
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' => $message), true, false);
}
}
return false;
}
/**
* Close IMAP connection
* Usually done on script shutdown
*
* @access public
*/
function close()
{
$this->conn->closeConnection();
if ($this->mcache)
$this->mcache->close();
}
/**
* Close IMAP connection and re-connect
* This is used to avoid some strange socket errors when talking to Courier IMAP
*
* @access public
*/
function reconnect()
{
$this->conn->closeConnection();
$connected = $this->connect($this->host, $this->user, $this->pass, $this->port, $this->ssl);
// issue SELECT command to restore connection status
if ($connected && strlen($this->mailbox))
$this->conn->select($this->mailbox);
}
/**
* Returns code of last error
*
* @return int Error code
*/
function get_error_code()
{
return $this->conn->errornum;
}
/**
* Returns message of last error
*
* @return string Error message
*/
function get_error_str()
{
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()
*
* @param array $opt Options array
*/
function set_options($opt)
{
$this->options = array_merge($this->options, (array)$opt);
}
/**
* Set default message charset
*
* This will be used for message decoding if a charset specification is not available
*
* @param string $cs Charset string
* @access public
*/
function set_charset($cs)
{
$this->default_charset = $cs;
}
/**
* This list of folders will be listed above all other folders
*
* @param array $arr Indexed list of folder names
* @access public
*/
function set_default_mailboxes($arr)
{
if (is_array($arr)) {
$this->default_folders = $arr;
// add inbox if not included
if (!in_array('INBOX', $this->default_folders))
array_unshift($this->default_folders, 'INBOX');
}
}
/**
* Set internal mailbox reference.
*
* All operations will be perfomed on this mailbox/folder
*
* @param string $mailbox Mailbox/Folder name
* @access public
*/
function set_mailbox($mailbox)
{
if ($this->mailbox == $mailbox)
return;
$this->mailbox = $mailbox;
// clear messagecount cache for this mailbox
$this->_clear_messagecount($mailbox);
}
/**
* Forces selection of a mailbox
*
* @param string $mailbox Mailbox/Folder name
* @access public
*/
function select_mailbox($mailbox=null)
{
if (!strlen($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
*
* @param number $page Page number to list
* @access public
*/
function set_page($page)
{
$this->list_page = (int)$page;
}
/**
* Set internal page size
*
* @param number $size Number of messages to display on one page
* @access public
*/
function set_pagesize($size)
{
$this->page_size = (int)$size;
}
/**
* Save a set of message ids for future message listing methods
*
* @param string IMAP Search query
* @param array List of message ids or NULL if empty
* @param string Charset of search string
* @param string Sorting field
* @param string True if set is sorted (SORT was used for searching)
*/
function set_search_set($str=null, $msgs=null, $charset=null, $sort_field=null, $threads=false, $sorted=false)
{
if (is_array($str) && $msgs == null)
list($str, $msgs, $charset, $sort_field, $threads, $sorted) = $str;
if ($msgs === false)
$msgs = array();
else if ($msgs != null && !is_array($msgs))
$msgs = explode(',', $msgs);
$this->search_string = $str;
$this->search_set = $msgs;
$this->search_charset = $charset;
$this->search_sort_field = $sort_field;
$this->search_threads = $threads;
$this->search_sorted = $sorted;
}
/**
* Return the saved search set as hash array
* @return array Search set
*/
function get_search_set()
{
return array($this->search_string,
$this->search_set,
$this->search_charset,
$this->search_sort_field,
$this->search_threads,
$this->search_sorted,
);
}
/**
* Returns the currently used mailbox name
*
* @return string Name of the mailbox/folder
* @access public
*/
function get_mailbox_name()
{
return $this->conn->connected() ? $this->mailbox : '';
}
/**
* Returns the IMAP server's capability
*
* @param string $cap Capability name
* @return mixed Capability value or TRUE if supported, FALSE if not
* @access public
*/
function get_capability($cap)
{
return $this->conn->getCapability(strtoupper($cap));
}
/**
* Sets threading flag to the best supported THREAD algorithm
*
* @param boolean $enable TRUE to enable and FALSE
* @return string Algorithm or false if THREAD is not supported
* @access public
*/
function set_threading($enable=false)
{
$this->threading = false;
if ($enable && ($caps = $this->get_capability('THREAD'))) {
if (in_array('REFS', $caps))
$this->threading = 'REFS';
else if (in_array('REFERENCES', $caps))
$this->threading = 'REFERENCES';
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
*
* @param string $flag Permanentflag name
* @return boolean True if this flag is supported
* @access public
*/
function check_permflag($flag)
{
$flag = strtoupper($flag);
$imap_flag = $this->conn->flags[$flag];
return (in_array_nocase($imap_flag, $this->conn->data['PERMANENTFLAGS']));
}
/**
* Returns the delimiter that is used by the IMAP server for folder separation
*
* @return string Delimiter string
* @access public
*/
function get_hierarchy_delimiter()
{
return $this->delimiter;
}
/**
* Get namespace
*
* @param string $name Namespace array index: personal, other, shared, prefix
*
* @return array Namespace data
* @access public
*/
function get_namespace($name=null)
{
$ns = $this->namespace;
if ($name) {
return isset($ns[$name]) ? $ns[$name] : null;
}
unset($ns['prefix']);
return $ns;
}
/**
* Sets delimiter and namespaces
*
* @access private
*/
private function set_env()
{
if ($this->delimiter !== null && $this->namespace !== null) {
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, $this->delimiter);
}
}
}
// Find personal namespace prefix for mod_mailbox()
// Prefix can be removed when there is only one personal namespace
if (is_array($this->namespace['personal']) && count($this->namespace['personal']) == 1) {
$this->namespace['prefix'] = $this->namespace['personal'][0][0];
}
$_SESSION['imap_namespace'] = $this->namespace;
$_SESSION['imap_delimiter'] = $this->delimiter;
}
/**
* Get message count for a specific mailbox
*
* @param string $mailbox Mailbox/folder name
* @param string $mode Mode for count [ALL|THREADS|UNSEEN|RECENT]
* @param boolean $force Force reading from server and update cache
* @param boolean $status Enables storing folder status info (max UID/count),
* required for mailbox_status()
* @return int Number of messages
* @access public
*/
function messagecount($mailbox='', $mode='ALL', $force=false, $status=true)
{
if (!strlen($mailbox)) {
$mailbox = $this->mailbox;
}
return $this->_messagecount($mailbox, $mode, $force, $status);
}
/**
* Private method for getting nr of messages
*
* @param string $mailbox Mailbox name
* @param string $mode Mode for count [ALL|THREADS|UNSEEN|RECENT]
* @param boolean $force Force reading from server and update cache
* @param boolean $status Enables storing folder status info (max UID/count),
* required for mailbox_status()
* @return int Number of messages
* @access private
* @see rcube_imap::messagecount()
*/
private function _messagecount($mailbox, $mode='ALL', $force=false, $status=true)
{
$mode = strtoupper($mode);
// count search set
if ($this->search_string && $mailbox == $this->mailbox && ($mode == 'ALL' || $mode == 'THREADS') && !$force) {
if ($this->search_threads)
return $mode == 'ALL' ? count((array)$this->search_set['depth']) : count((array)$this->search_set['tree']);
else
return count((array)$this->search_set);
}
$a_mailbox_cache = $this->get_cache('messagecount');
// return cached value
if (!$force && is_array($a_mailbox_cache[$mailbox]) && isset($a_mailbox_cache[$mailbox][$mode]))
return $a_mailbox_cache[$mailbox][$mode];
if (!is_array($a_mailbox_cache[$mailbox]))
$a_mailbox_cache[$mailbox] = array();
if ($mode == 'THREADS') {
$res = $this->_threadcount($mailbox, $msg_count);
$count = $res['count'];
if ($status) {
$this->set_folder_stats($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 = $this->conn->countRecent($mailbox);
}
// use SEARCH for message counting
else if ($this->skip_deleted) {
$search_str = "ALL UNDELETED";
$keys = array('COUNT');
$need_uid = false;
if ($mode == 'UNSEEN') {
$search_str .= " UNSEEN";
}
else {
if ($this->messages_caching) {
$keys[] = 'ALL';
}
if ($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, $need_uid, $keys);
$count = is_array($index) ? $index['COUNT'] : 0;
if ($mode == 'ALL') {
if ($this->messages_caching) {
// Save additional info required by cache status check
$this->icache['undeleted_idx'] = array($mailbox, $index['ALL'], $index['COUNT']);
}
if ($status) {
$this->set_folder_stats($mailbox, 'cnt', $count);
$this->set_folder_stats($mailbox, 'maxuid', is_array($index) ? $index['MAX'] : 0);
}
}
}
else {
if ($mode == 'UNSEEN')
$count = $this->conn->countUnseen($mailbox);
else {
$count = $this->conn->countMessages($mailbox);
if ($status) {
$this->set_folder_stats($mailbox,'cnt', $count);
$this->set_folder_stats($mailbox, 'maxuid', $count ? $this->id2uid($count, $mailbox) : 0);
}
}
}
$a_mailbox_cache[$mailbox][$mode] = (int)$count;
// write back to cache
$this->update_cache('messagecount', $a_mailbox_cache);
return (int)$count;
}
/**
* Private method for getting nr of threads
*
* @param string $mailbox Folder name
*
* @returns array Array containing items: 'count' - threads count,
* 'msgcount' = messages count, 'maxuid' = max. UID in the set
* @access private
*/
private function _threadcount($mailbox)
{
$result = array();
if (!empty($this->icache['threads'])) {
$dcount = count($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,
);
}
return $result;
}
/**
* Public method for listing headers
* convert mailbox name with root dir first
*
* @param string $mailbox Mailbox/folder name
* @param int $page Current page to list
* @param string $sort_field Header field to sort by
* @param string $sort_order Sort order [ASC|DESC]
* @param int $slice Number of slice items to extract from result array
* @return array Indexed array with message header objects
* @access public
*/
function list_headers($mailbox='', $page=NULL, $sort_field=NULL, $sort_order=NULL, $slice=0)
{
if (!strlen($mailbox)) {
$mailbox = $this->mailbox;
}
return $this->_list_headers($mailbox, $page, $sort_field, $sort_order, $slice);
}
/**
* Private method for listing message headers
*
* @param string $mailbox Mailbox name
* @param int $page Current page to list
* @param string $sort_field Header field to sort by
* @param string $sort_order Sort order [ASC|DESC]
* @param int $slice Number of slice items to extract from result array
*
* @return array Indexed array with message header objects
* @see rcube_imap::list_headers
*/
private function _list_headers($mailbox='', $page=NULL, $sort_field=NULL, $sort_order=NULL, $slice=0)
{
if (!strlen($mailbox))
return array();
// use saved message set
if ($this->search_string && $mailbox == $this->mailbox)
return $this->_list_header_set($mailbox, $page, $sort_field, $sort_order, $slice);
if ($this->threading)
return $this->_list_thread_headers($mailbox, $page, $sort_field, $sort_order, $slice);
$this->_set_sort_order($sort_field, $sort_order);
$page = $page ? $page : $this->list_page;
// Use messages cache
if ($mcache = $this->get_mcache_engine()) {
$msg_index = $mcache->get_index($mailbox, $this->sort_field, $this->sort_order);
if (empty($msg_index))
return array();
$from = ($page-1) * $this->page_size;
$to = $from + $this->page_size;
$msg_index = array_values($msg_index); // UIDs
$is_uid = true;
$sorted = true;
if ($from || $to)
$msg_index = array_slice($msg_index, $from, $to - $from);
if ($slice)
$msg_index = array_slice($msg_index, -$slice, $slice);
$a_msg_headers = $mcache->get_messages($mailbox, $msg_index);
}
// retrieve headers from IMAP
// use message index sort as default sorting (for better performance)
else if (!$this->sort_field) {
if ($this->skip_deleted) {
// @TODO: this could be cached
if ($msg_index = $this->_search_index($mailbox, 'ALL UNDELETED')) {
list($begin, $end) = $this->_get_message_range(count($msg_index), $page);
$msg_index = array_slice($msg_index, $begin, $end-$begin);
}
}
else if ($max = $this->conn->countMessages($mailbox)) {
list($begin, $end) = $this->_get_message_range($max, $page);
$msg_index = range($begin+1, $end);
}
else
$msg_index = array();
if ($slice && $msg_index)
$msg_index = array_slice($msg_index, ($this->sort_order == 'DESC' ? 0 : -$slice), $slice);
// fetch reqested headers from server
if ($msg_index)
$a_msg_headers = $this->fetch_headers($mailbox, $msg_index);
}
// use SORT command
else if ($this->get_capability('SORT') &&
// Courier-IMAP provides SORT capability but allows to disable it by admin (#1486959)
($msg_index = $this->conn->sort($mailbox, $this->sort_field,
$this->skip_deleted ? 'UNDELETED' : '', true)) !== false
) {
if (!empty($msg_index)) {
list($begin, $end) = $this->_get_message_range(count($msg_index), $page);
$msg_index = array_slice($msg_index, $begin, $end-$begin);
$is_uid = true;
if ($slice)
$msg_index = array_slice($msg_index, ($this->sort_order == 'DESC' ? 0 : -$slice), $slice);
// fetch reqested headers from server
$a_msg_headers = $this->fetch_headers($mailbox, $msg_index, true);
}
}
// fetch specified header for all messages and sort
else if ($msg_index = $this->conn->fetchHeaderIndex($mailbox, "1:*",
$this->sort_field, $this->skip_deleted, true)
) {
asort($msg_index); // ASC
$msg_index = array_keys($msg_index);
list($begin, $end) = $this->_get_message_range(count($msg_index), $page);
$msg_index = array_slice($msg_index, $begin, $end-$begin);
$is_uid = true;
if ($slice)
$msg_index = array_slice($msg_index, ($this->sort_order == 'DESC' ? 0 : -$slice), $slice);
// fetch reqested headers from server
$a_msg_headers = $this->fetch_headers($mailbox, $msg_index, true);
}
// return empty array if no messages found
if (!is_array($a_msg_headers) || empty($a_msg_headers))
return array();
// use this class for message sorting
$sorter = new rcube_header_sorter();
$sorter->set_index($msg_index, $is_uid);
$sorter->sort_headers($a_msg_headers);
if ($this->sort_order == 'DESC' && !$sorted)
$a_msg_headers = array_reverse($a_msg_headers);
return array_values($a_msg_headers);
}
/**
* Private method for listing message headers using threads
*
* @param string $mailbox Mailbox/folder name
* @param int $page Current page to list
* @param string $sort_field Header field to sort by
* @param string $sort_order Sort order [ASC|DESC]
* @param int $slice Number of slice items to extract from result array
*
* @return array Indexed array with message header objects
* @see rcube_imap::list_headers
*/
private function _list_thread_headers($mailbox, $page=NULL, $sort_field=NULL, $sort_order=NULL, $slice=0)
{
$this->_set_sort_order($sort_field, $sort_order);
$page = $page ? $page : $this->list_page;
$mcache = $this->get_mcache_engine();
// get all threads (not sorted)
if ($mcache)
list ($thread_tree, $msg_depth, $has_children) = $mcache->get_thread($mailbox);
else
list ($thread_tree, $msg_depth, $has_children) = $this->fetch_threads($mailbox);
if (empty($thread_tree))
return array();
$msg_index = $this->sort_threads($mailbox, $thread_tree);
return $this->_fetch_thread_headers($mailbox,
$thread_tree, $msg_depth, $has_children, $msg_index, $page, $slice);
}
/**
* Method for fetching threads data
*
* @param string $mailbox Folder name
* @param bool $force Use IMAP server, no cache
*
* @return array Array with thread data
*/
function fetch_threads($mailbox, $force = false)
{
if (!$force && ($mcache = $this->get_mcache_engine())) {
// don't store in self's internal cache, cache has it's own internal cache
return $mcache->get_thread($mailbox);
}
if (empty($this->icache['threads'])) {
// get all threads
$result = $this->conn->thread($mailbox, $this->threading,
$this->skip_deleted ? 'UNDELETED' : '');
// add to internal (fast) cache
$this->icache['threads'] = array();