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673 lines
19 KiB
PHP
673 lines
19 KiB
PHP
<?php
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/*
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+-----------------------------------------------------------------------+
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| program/include/rcube_result_thread.php |
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| |
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| This file is part of the Roundcube Webmail client |
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| Copyright (C) 2005-2011, The Roundcube Dev Team |
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| Copyright (C) 2011, Kolab Systems AG |
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| |
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| Licensed under the GNU General Public License version 3 or |
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| any later version with exceptions for skins & plugins. |
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| See the README file for a full license statement. |
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| PURPOSE: |
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| THREAD response handler |
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+-----------------------------------------------------------------------+
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| Author: Thomas Bruederli <roundcube@gmail.com> |
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| Author: Aleksander Machniak <alec@alec.pl> |
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+-----------------------------------------------------------------------+
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$Id$
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*/
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/**
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* Class for accessing IMAP's THREAD result
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*/
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class rcube_result_thread
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{
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protected $raw_data;
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protected $mailbox;
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protected $meta = array();
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protected $order = 'ASC';
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const SEPARATOR_ELEMENT = ' ';
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const SEPARATOR_ITEM = '~';
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const SEPARATOR_LEVEL = ':';
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/**
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* Object constructor.
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*/
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public function __construct($mailbox = null, $data = null)
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{
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$this->mailbox = $mailbox;
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$this->init($data);
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}
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/**
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* Initializes object with IMAP command response
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*
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* @param string $data IMAP response string
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*/
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public function init($data = null)
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{
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$this->meta = array();
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$data = explode('*', (string)$data);
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// ...skip unilateral untagged server responses
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for ($i=0, $len=count($data); $i<$len; $i++) {
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if (preg_match('/^ THREAD/i', $data[$i])) {
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$data[$i] = substr($data[$i], 7);
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break;
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}
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unset($data[$i]);
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}
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if (empty($data)) {
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return;
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}
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$data = array_shift($data);
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$data = trim($data);
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$data = preg_replace('/[\r\n]/', '', $data);
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$data = preg_replace('/\s+/', ' ', $data);
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$this->raw_data = $this->parse_thread($data);
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}
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/**
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* Checks the result from IMAP command
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*
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* @return bool True if the result is an error, False otherwise
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*/
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public function is_error()
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{
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return $this->raw_data === null ? true : false;
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}
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/**
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* Checks if the result is empty
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*
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* @return bool True if the result is empty, False otherwise
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*/
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public function is_empty()
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{
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return empty($this->raw_data) ? true : false;
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}
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/**
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* Returns number of elements (threads) in the result
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*
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* @return int Number of elements
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*/
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public function count()
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{
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if ($this->meta['count'] !== null)
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return $this->meta['count'];
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if (empty($this->raw_data)) {
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$this->meta['count'] = 0;
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}
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else {
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$this->meta['count'] = 1 + substr_count($this->raw_data, self::SEPARATOR_ELEMENT);
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}
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if (!$this->meta['count'])
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$this->meta['messages'] = 0;
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return $this->meta['count'];
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}
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/**
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* Returns number of all messages in the result
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*
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* @return int Number of elements
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*/
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public function count_messages()
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{
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if ($this->meta['messages'] !== null)
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return $this->meta['messages'];
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if (empty($this->raw_data)) {
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$this->meta['messages'] = 0;
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}
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else {
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$this->meta['messages'] = 1
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+ substr_count($this->raw_data, self::SEPARATOR_ELEMENT)
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+ substr_count($this->raw_data, self::SEPARATOR_ITEM);
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}
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if ($this->meta['messages'] == 0 || $this->meta['messages'] == 1)
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$this->meta['count'] = $this->meta['messages'];
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return $this->meta['messages'];
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}
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/**
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* Returns maximum message identifier in the result
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*
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* @return int Maximum message identifier
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*/
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public function max()
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{
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if (!isset($this->meta['max'])) {
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$this->meta['max'] = (int) @max($this->get());
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}
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return $this->meta['max'];
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}
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/**
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* Returns minimum message identifier in the result
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*
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* @return int Minimum message identifier
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*/
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public function min()
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{
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if (!isset($this->meta['min'])) {
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$this->meta['min'] = (int) @min($this->get());
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}
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return $this->meta['min'];
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}
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/**
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* Slices data set.
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*
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* @param $offset Offset (as for PHP's array_slice())
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* @param $length Number of elements (as for PHP's array_slice())
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*/
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public function slice($offset, $length)
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{
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$data = explode(self::SEPARATOR_ELEMENT, $this->raw_data);
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$data = array_slice($data, $offset, $length);
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$this->meta = array();
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$this->meta['count'] = count($data);
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$this->raw_data = implode(self::SEPARATOR_ELEMENT, $data);
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}
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/**
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* Filters data set. Removes threads not listed in $roots list.
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*
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* @param array $roots List of IDs of thread roots.
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*/
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public function filter($roots)
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{
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$datalen = strlen($this->raw_data);
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$roots = array_flip($roots);
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$result = '';
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$start = 0;
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$this->meta = array();
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$this->meta['count'] = 0;
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while (($pos = @strpos($this->raw_data, self::SEPARATOR_ELEMENT, $start))
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|| ($start < $datalen && ($pos = $datalen))
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) {
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$len = $pos - $start;
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$elem = substr($this->raw_data, $start, $len);
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$start = $pos + 1;
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// extract root message ID
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if ($npos = strpos($elem, self::SEPARATOR_ITEM)) {
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$root = (int) substr($elem, 0, $npos);
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}
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else {
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$root = $elem;
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}
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if (isset($roots[$root])) {
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$this->meta['count']++;
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$result .= self::SEPARATOR_ELEMENT . $elem;
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}
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}
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$this->raw_data = ltrim($result, self::SEPARATOR_ELEMENT);
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}
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/**
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* Reverts order of elements in the result
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*/
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public function revert()
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{
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$this->order = $this->order == 'ASC' ? 'DESC' : 'ASC';
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if (empty($this->raw_data)) {
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return;
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}
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$this->meta['pos'] = array();
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$datalen = strlen($this->raw_data);
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$result = '';
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$start = 0;
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while (($pos = @strpos($this->raw_data, self::SEPARATOR_ELEMENT, $start))
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|| ($start < $datalen && ($pos = $datalen))
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) {
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$len = $pos - $start;
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$elem = substr($this->raw_data, $start, $len);
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$start = $pos + 1;
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$result = $elem . self::SEPARATOR_ELEMENT . $result;
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}
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$this->raw_data = rtrim($result, self::SEPARATOR_ELEMENT);
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}
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/**
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* Check if the given message ID exists in the object
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*
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* @param int $msgid Message ID
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* @param bool $get_index When enabled element's index will be returned.
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* Elements are indexed starting with 0
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*
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* @return boolean True on success, False if message ID doesn't exist
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*/
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public function exists($msgid, $get_index = false)
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{
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$msgid = (int) $msgid;
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$begin = implode('|', array(
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'^',
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preg_quote(self::SEPARATOR_ELEMENT, '/'),
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preg_quote(self::SEPARATOR_LEVEL, '/'),
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));
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$end = implode('|', array(
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'$',
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preg_quote(self::SEPARATOR_ELEMENT, '/'),
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preg_quote(self::SEPARATOR_ITEM, '/'),
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));
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if (preg_match("/($begin)$msgid($end)/", $this->raw_data, $m,
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$get_index ? PREG_OFFSET_CAPTURE : null)
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) {
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if ($get_index) {
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$idx = 0;
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if ($m[0][1]) {
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$idx = substr_count($this->raw_data, self::SEPARATOR_ELEMENT, 0, $m[0][1]+1)
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+ substr_count($this->raw_data, self::SEPARATOR_ITEM, 0, $m[0][1]+1);
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}
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// cache position of this element, so we can use it in get_element()
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$this->meta['pos'][$idx] = (int)$m[0][1];
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return $idx;
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}
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return true;
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}
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return false;
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}
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/**
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* Return IDs of all messages in the result. Threaded data will be flattened.
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*
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* @return array List of message identifiers
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*/
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public function get()
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{
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if (empty($this->raw_data)) {
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return array();
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}
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$regexp = '/(' . preg_quote(self::SEPARATOR_ELEMENT, '/')
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. '|' . preg_quote(self::SEPARATOR_ITEM, '/') . '[0-9]+' . preg_quote(self::SEPARATOR_LEVEL, '/')
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.')/';
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return preg_split($regexp, $this->raw_data);
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}
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/**
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* Return all messages in the result.
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*
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* @return array List of message identifiers
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*/
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public function get_compressed()
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{
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if (empty($this->raw_data)) {
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return '';
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}
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return rcube_imap_generic::compressMessageSet($this->get());
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}
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/**
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* Return result element at specified index (all messages, not roots)
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*
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* @param int|string $index Element's index or "FIRST" or "LAST"
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*
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* @return int Element value
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*/
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public function get_element($index)
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{
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$count = $this->count();
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if (!$count) {
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return null;
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}
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// first element
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if ($index === 0 || $index === '0' || $index === 'FIRST') {
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preg_match('/^([0-9]+)/', $this->raw_data, $m);
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$result = (int) $m[1];
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return $result;
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}
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// last element
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if ($index === 'LAST' || $index == $count-1) {
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preg_match('/([0-9]+)$/', $this->raw_data, $m);
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$result = (int) $m[1];
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return $result;
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}
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// do we know the position of the element or the neighbour of it?
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if (!empty($this->meta['pos'])) {
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$element = preg_quote(self::SEPARATOR_ELEMENT, '/');
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$item = preg_quote(self::SEPARATOR_ITEM, '/') . '[0-9]+' . preg_quote(self::SEPARATOR_LEVEL, '/') .'?';
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$regexp = '(' . $element . '|' . $item . ')';
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if (isset($this->meta['pos'][$index])) {
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if (preg_match('/([0-9]+)/', $this->raw_data, $m, null, $this->meta['pos'][$index]))
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$result = $m[1];
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}
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else if (isset($this->meta['pos'][$index-1])) {
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// get chunk of data after previous element
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$data = substr($this->raw_data, $this->meta['pos'][$index-1]+1, 50);
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$data = preg_replace('/^[0-9]+/', '', $data); // remove UID at $index position
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$data = preg_replace("/^$regexp/", '', $data); // remove separator
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if (preg_match('/^([0-9]+)/', $data, $m))
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$result = $m[1];
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}
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else if (isset($this->meta['pos'][$index+1])) {
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// get chunk of data before next element
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$pos = max(0, $this->meta['pos'][$index+1] - 50);
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$len = min(50, $this->meta['pos'][$index+1]);
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$data = substr($this->raw_data, $pos, $len);
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$data = preg_replace("/$regexp\$/", '', $data); // remove separator
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if (preg_match('/([0-9]+)$/', $data, $m))
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$result = $m[1];
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}
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if (isset($result)) {
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return (int) $result;
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}
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}
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// Finally use less effective method
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$data = $this->get();
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return $data[$index];
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}
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/**
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* Returns response parameters e.g. MAILBOX, ORDER
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*
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* @param string $param Parameter name
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*
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* @return array|string Response parameters or parameter value
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*/
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public function get_parameters($param=null)
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{
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$params = $this->params;
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$params['MAILBOX'] = $this->mailbox;
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$params['ORDER'] = $this->order;
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if ($param !== null) {
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return $params[$param];
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}
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return $params;
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}
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/**
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* THREAD=REFS sorting implementation (based on provided index)
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*
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* @param rcube_result_index $index Sorted message identifiers
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*/
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public function sort($index)
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{
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$this->sort_order = $index->get_parameters('ORDER');
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if (empty($this->raw_data)) {
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return;
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}
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// when sorting search result it's good to make the index smaller
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if ($index->count() != $this->count_messages()) {
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$index->intersect($this->get());
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}
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$result = array_fill_keys($index->get(), null);
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$datalen = strlen($this->raw_data);
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$start = 0;
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// Here we're parsing raw_data twice, we want only one big array
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// in memory at a time
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// Assign roots
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while (($pos = @strpos($this->raw_data, self::SEPARATOR_ELEMENT, $start))
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|| ($start < $datalen && ($pos = $datalen))
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) {
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$len = $pos - $start;
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$elem = substr($this->raw_data, $start, $len);
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$start = $pos + 1;
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$items = explode(self::SEPARATOR_ITEM, $elem);
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$root = (int) array_shift($items);
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$result[$elem] = $elem;
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foreach ($items as $item) {
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list($lv, $id) = explode(self::SEPARATOR_LEVEL, $item);
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$result[$id] = $root;
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}
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}
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// get only unique roots
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$result = array_filter($result); // make sure there are no nulls
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$result = array_unique($result, SORT_NUMERIC);
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// Re-sort raw data
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$result = array_fill_keys($result, null);
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$start = 0;
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while (($pos = @strpos($this->raw_data, self::SEPARATOR_ELEMENT, $start))
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|| ($start < $datalen && ($pos = $datalen))
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) {
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$len = $pos - $start;
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$elem = substr($this->raw_data, $start, $len);
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$start = $pos + 1;
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$npos = strpos($elem, self::SEPARATOR_ITEM);
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$root = (int) ($npos ? substr($elem, 0, $npos) : $elem);
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$result[$root] = $elem;
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}
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$this->raw_data = implode(self::SEPARATOR_ELEMENT, $result);
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}
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/**
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* Returns data as tree
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*
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* @return array Data tree
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*/
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public function get_tree()
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{
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$datalen = strlen($this->raw_data);
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$result = array();
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$start = 0;
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while (($pos = @strpos($this->raw_data, self::SEPARATOR_ELEMENT, $start))
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|| ($start < $datalen && ($pos = $datalen))
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) {
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$len = $pos - $start;
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$elem = substr($this->raw_data, $start, $len);
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$items = explode(self::SEPARATOR_ITEM, $elem);
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$result[array_shift($items)] = $this->build_thread($items);
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$start = $pos + 1;
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}
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return $result;
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}
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/**
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* Returns thread depth and children data
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*
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* @return array Thread data
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*/
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public function get_thread_data()
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{
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$data = $this->get_tree();
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$depth = array();
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$children = array();
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$this->build_thread_data($data, $depth, $children);
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return array($depth, $children);
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}
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/**
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* Creates 'depth' and 'children' arrays from stored thread 'tree' data.
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*/
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protected function build_thread_data($data, &$depth, &$children, $level = 0)
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{
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foreach ((array)$data as $key => $val) {
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$empty = empty($val) || !is_array($val);
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$children[$key] = !$empty;
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$depth[$key] = $level;
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if (!$empty) {
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$this->build_thread_data($val, $depth, $children, $level + 1);
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}
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}
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}
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/**
|
|
* Converts part of the raw thread into an array
|
|
*/
|
|
protected function build_thread($items, $level = 1, &$pos = 0)
|
|
{
|
|
$result = array();
|
|
|
|
for ($len=count($items); $pos < $len; $pos++) {
|
|
list($lv, $id) = explode(self::SEPARATOR_LEVEL, $items[$pos]);
|
|
if ($level == $lv) {
|
|
$pos++;
|
|
$result[$id] = $this->build_thread($items, $level+1, $pos);
|
|
}
|
|
else {
|
|
$pos--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
|
|
/**
|
|
* IMAP THREAD response parser
|
|
*/
|
|
protected function parse_thread($str, $begin = 0, $end = 0, $depth = 0)
|
|
{
|
|
// Don't be tempted to change $str to pass by reference to speed this up - it will slow it down by about
|
|
// 7 times instead :-) See comments on http://uk2.php.net/references and this article:
|
|
// http://derickrethans.nl/files/phparch-php-variables-article.pdf
|
|
$node = '';
|
|
if (!$end) {
|
|
$end = strlen($str);
|
|
}
|
|
|
|
// Let's try to store data in max. compacted stracture as a string,
|
|
// arrays handling is much more expensive
|
|
// For the following structure: THREAD (2)(3 6 (4 23)(44 7 96))
|
|
// -- 2
|
|
//
|
|
// -- 3
|
|
// \-- 6
|
|
// |-- 4
|
|
// | \-- 23
|
|
// |
|
|
// \-- 44
|
|
// \-- 7
|
|
// \-- 96
|
|
//
|
|
// The output will be: 2,3^1:6^2:4^3:23^2:44^3:7^4:96
|
|
|
|
if ($str[$begin] != '(') {
|
|
$stop = $begin + strspn($str, '1234567890', $begin, $end - $begin);
|
|
$msg = substr($str, $begin, $stop - $begin);
|
|
if (!$msg) {
|
|
return $node;
|
|
}
|
|
|
|
$this->meta['messages']++;
|
|
|
|
$node .= ($depth ? self::SEPARATOR_ITEM.$depth.self::SEPARATOR_LEVEL : '').$msg;
|
|
|
|
if ($stop + 1 < $end) {
|
|
$node .= $this->parse_thread($str, $stop + 1, $end, $depth + 1);
|
|
}
|
|
} else {
|
|
$off = $begin;
|
|
while ($off < $end) {
|
|
$start = $off;
|
|
$off++;
|
|
$n = 1;
|
|
while ($n > 0) {
|
|
$p = strpos($str, ')', $off);
|
|
if ($p === false) {
|
|
// error, wrong structure, mismatched brackets in IMAP THREAD response
|
|
// @TODO: write error to the log or maybe set $this->raw_data = null;
|
|
return $node;
|
|
}
|
|
$p1 = strpos($str, '(', $off);
|
|
if ($p1 !== false && $p1 < $p) {
|
|
$off = $p1 + 1;
|
|
$n++;
|
|
} else {
|
|
$off = $p + 1;
|
|
$n--;
|
|
}
|
|
}
|
|
|
|
$thread = $this->parse_thread($str, $start + 1, $off - 1, $depth);
|
|
if ($thread) {
|
|
if (!$depth) {
|
|
if ($node) {
|
|
$node .= self::SEPARATOR_ELEMENT;
|
|
}
|
|
}
|
|
$node .= $thread;
|
|
}
|
|
}
|
|
}
|
|
|
|
return $node;
|
|
}
|
|
}
|