<?php

/*
 +-----------------------------------------------------------------------+
 | rcube_sieve_script class for sieverules script parsing                |
 |                                                                       |
 | Author: Aleksander Machniak <alec@alec.pl>                            |
 | Modifications by: Philip Weir                                         |
 |   * Changed name of keys in script array                              |
 |   * Added support for address and envelope                            |
 |   * Added support for vacation                                        |
 |   * Added support for disabled rules (written to file as comment)     |
 |   * Added support for regex tests                                     |
 |   * Added support for imapflags                                       |
 |   * Added support for relational operators and comparators            |
 |   * Added support for subaddress tests                                |
 |   * Added support for notify action                                   |
 |   * Added support for stop action                                     |
 |   * Added support for body and copy                                   |
 |   * Added support for spamtest and virustest                          |
 |   * Added support for date                                            |
 |   * Added support for editheader                                      |
 +-----------------------------------------------------------------------+
*/

define('SIEVE_ERROR_BAD_ACTION', 1);
define('SIEVE_ERROR_NOT_FOUND', 2);

// define constants for sieve file
if (!defined('RCUBE_SIEVE_NEWLINE'))
	define('RCUBE_SIEVE_NEWLINE', "\r\n");

if (!defined('RCUBE_SIEVE_INDENT'))
	define('RCUBE_SIEVE_INDENT', "\t");

if (!defined('RCUBE_SIEVE_HEADER'))
	define('RCUBE_SIEVE_HEADER', "## Generated by Roundcube Webmail SieveRules Plugin ##");

class rcube_sieve_script
{
	private $elsif = true;
	private $content = array();
	private $supported = array(
						'fileinto',
						'reject',
						'ereject',
						'vacation',
						'imapflags',
						'imap4flags',
						'notify',
						'enotify',
						'spamtest',
						'virustest',
						'date',
						'editheader'
						);
	public $raw = '';

	public function __construct($script, $ext = array(), $elsif = true)
	{
		$this->raw = $script;
		$this->elsif = $elsif;

		// adjust supported extenstion to match sieve server
		$this->supported = array_intersect($this->supported, $ext);
		if (in_array('copy', $ext))
			$this->supported = array_merge($this->supported, array('fileinto_copy','redirect_copy'));

		if (in_array('editheader', $ext))
			$this->supported = array_merge($this->supported, array('editheaderadd','editheaderrem'));

		// include standard actions in supported list
		$this->supported = array_merge($this->supported, array('redirect','keep','discard','stop'));

		// load script
		$this->content = $this->parse_text($script);
	}

	public function add_text($script)
	{
		$content = $this->parse_text($script);
		$result = false;

		// check existsing script rules names
		foreach ($this->content as $idx => $elem)
			$names[$elem['name']] = $idx;

		foreach ($content as $elem) {
			if (!isset($names[$elem['name']])) {
				array_push($this->content, $elem);
				$result = true;
			}
		}

		return $result;
	}

	public function import_filters($content)
	{
		if (is_array($content)) {
			$result = false;

			// check existsing script rules names
			foreach ($this->content as $idx => $elem)
				$names[$elem['name']] = $idx;

			foreach ($content as $elem) {
				if (!isset($names[$elem['name']])) {
					array_push($this->content, $elem);
					$result = true;
				}
			}
		}
		else {
			$this->add_text($content);
		}
	}

	public function add_rule($content, $pos = null)
	{
		foreach ($content['actions'] as $action) {
			if (!in_array($action['type'], $this->supported))
				return SIEVE_ERROR_BAD_ACTION;
		}

		if ($pos !== null)
			array_splice($this->content, $pos, 0, array($content));
		else
			array_push($this->content, $content);

		return true;
	}

	public function delete_rule($index)
	{
		if (isset($this->content[$index])) {
			unset($this->content[$index]);
			$this->content = array_values($this->content);
			return true;
		}

		return SIEVE_ERROR_NOT_FOUND;
	}

	public function size()
	{
		return sizeof($this->content);
	}

	public function update_rule($index, $content)
	{
		foreach ($content['actions'] as $action) {
			if (!in_array($action['type'], $this->supported))
				return SIEVE_ERROR_BAD_ACTION;
		}

		if ($this->content[$index]) {
			$this->content[$index] = $content;
			return true;
		}

		return SIEVE_ERROR_NOT_FOUND;
	}

	public function move_rule($source, $destination)
	{
		$this->add_rule($this->content[$source], $destination);

		if ($source < $destination)
			$this->delete_rule($source);
		else
			$this->delete_rule($source + 1);
	}

	public function as_text()
	{
		$script = '';
		$variables = '';
		$exts = array();

		// rules
		$activeRules = 0;
		foreach ($this->content as $rule) {
			$tests = array();
			$i = 0;

			if ($rule['disabled'] == 1) {
				$script .= '# rule:[' . $rule['name'] . "]" . RCUBE_SIEVE_NEWLINE;
				$script .= '# disabledRule:[' . $this->_safe_serial(serialize($rule)) . "]" . RCUBE_SIEVE_NEWLINE;
			}
			else {
				// header
				$script .= '# rule:[' . $rule['name'] . "]" . RCUBE_SIEVE_NEWLINE;

				// constraints expressions
				foreach ($rule['tests'] as $test) {
					$tests[$i] = '';

					switch ($test['type']) {
						case 'size':
							$tests[$i] .= ($test['not'] ? 'not ' : '');
							$tests[$i] .= 'size :' . ($test['operator']=='under' ? 'under ' : 'over ') . $test['target'];
							break;
						case 'virustest':
						case 'spamtest':
							array_push($exts, $test['type']);
							array_push($exts, 'relational');
							array_push($exts, 'comparator-i;ascii-numeric');
							$tests[$i] .= ($test['not'] ? 'not ' : '');
							$tests[$i] .= $test['type'] . ' :value ' . ($test['operator'] == 'eq' ? '"eq" ' :
									($test['operator'] == 'le' ? '"le" ' : '"ge" ')) .
									':comparator "i;ascii-numeric" "' . $test['target'] .'"';
							break;
						case 'true':
							$tests[$i] .= ($test['not'] ? 'not true' : 'true');
							break;
						case 'exists':
							$tests[$i] .= ($test['not'] ? 'not ' : '');

							if (is_array($test['header']))
								$tests[$i] .= 'exists ["' . implode('", "', $this->_escape_string($test['header'])) . '"]';
							else
								$tests[$i] .= 'exists "' . $this->_escape_string($test['header']) . '"';

							break;
						case 'envelope':
							array_push($exts, 'envelope');
						case 'header':
						case 'address':
							if ($test['operator'] == 'regex')
								array_push($exts, 'regex');
							elseif (substr($test['operator'], 0, 5) == 'count' || substr($test['operator'], 0, 5) == 'value')
								array_push($exts, 'relational');
							elseif ($test['operator'] == 'user' || $test['operator'] == 'detail' || $test['operator'] == 'domain')
								array_push($exts, 'subaddress');

							$tests[$i] .= ($test['not'] ? 'not ' : '');
							$tests[$i] .= $test['type']. ' :' . $test['operator'];

							if ($test['comparator'] != '') {
								if ($test['comparator'] != 'i;ascii-casemap' && $test['comparator'] != 'i;octet')
									array_push($exts, 'comparator-' . $test['comparator']);

								$tests[$i] .= ' :comparator "' . $test['comparator'] . '"';
							}

							if (is_array($test['header']))
								$tests[$i] .= ' ["' . implode('", "', $this->_escape_string($test['header'])) . '"]';
							else
								$tests[$i] .= ' "' . $this->_escape_string($test['header']) . '"';

							if (is_array($test['target']))
								$tests[$i] .= ' ["' . implode('", "', $this->_escape_string($test['target'])) . '"]';
							else
								$tests[$i] .= ' "' . $this->_escape_string($test['target']) . '"';

							break;
						case 'body':
							array_push($exts, 'body');
							if ($test['operator'] == 'regex')
								array_push($exts, 'regex');
							elseif (substr($test['operator'], 0, 5) == 'count' || substr($test['operator'], 0, 5) == 'value')
								array_push($exts, 'relational');

							$tests[$i] .= ($test['not'] ? 'not ' : '');
							$tests[$i] .= $test['type'];

							if ($test['bodypart'] != '')
								$tests[$i] .= ' :' . $test['bodypart'];

							if ($test['contentpart'] != '')
								$tests[$i] .= ' "'. $test['contentpart'] .'"';

							$tests[$i] .= ' :' . $test['operator'];

							if ($test['comparator'] != '') {
								if ($test['comparator'] != 'i;ascii-casemap' && $test['comparator'] != 'i;octet')
									array_push($exts, 'comparator-' . $test['comparator']);

								$tests[$i] .= ' :comparator "' . $test['comparator'] . '"';
							}

							if (is_array($test['target']))
								$tests[$i] .= ' ["' . implode('", "', $this->_escape_string($test['target'])) . '"]';
							else
								$tests[$i] .= ' "' . $this->_escape_string($test['target']) . '"';

							break;
						case 'date':
							array_push($exts, 'date');
							if ($test['operator'] == 'regex')
								array_push($exts, 'regex');
							elseif (substr($test['operator'], 0, 5) == 'count' || substr($test['operator'], 0, 5) == 'value')
								array_push($exts, 'relational');

							$tests[$i] .= ($test['not'] ? 'not ' : '');
							$tests[$i] .= $test['header'];

							$timezone = rcube::get_instance()->config->get('timezone', 'auto');
							if ($timezone != 'auto') {
								$tz = new DateTimeZone($timezone);
								$date = new DateTime('now', $tz);
								$tests[$i] .= ' :zone ' . '"' . $date->format('O') . '"';
							}

							$tests[$i] .= ' :' . $test['operator'];

							if ($test['comparator'] != '') {
								if ($test['comparator'] != 'i;ascii-casemap' && $test['comparator'] != 'i;octet')
									array_push($exts, 'comparator-' . $test['comparator']);

								$tests[$i] .= ' :comparator "' . $test['comparator'] . '"';
							}

							$tests[$i] .= ' "' . $this->_escape_string($test['datepart']) . '"';
							$tests[$i] .= ' "' . $this->_escape_string($test['target']) . '"';

							break;
					}

					$i++;
				}

				$script .= ($activeRules > 0 && $this->elsif ? 'els' : '') . ($rule['join'] ? 'if allof (' : 'if anyof (');
				$activeRules++;

				if (sizeof($tests) > 1)
					$script .= implode("," . RCUBE_SIEVE_NEWLINE . RCUBE_SIEVE_INDENT, $tests);
				elseif (sizeof($tests))
					$script .= $tests[0];
				else
					$script .= 'true';


				$script .= ")". RCUBE_SIEVE_NEWLINE ."{" . RCUBE_SIEVE_NEWLINE;

				// action(s)
				$actions = '';
				foreach ($rule['actions'] as $action) {
					switch ($action['type']) {
						case 'fileinto':
						case 'fileinto_copy':
							array_push($exts, 'fileinto');

							$args = '';
							if ($action['type'] == 'fileinto_copy') {
								array_push($exts, 'copy');
								$args .= ' :copy';
							}

							if ($action['create']) {
								array_push($exts, 'mailbox');
								$args .= ' :create';
							}

							// variables support in fileinto by David Warden
							if (preg_match('/\$\{\d+\}/', $action['target']))
								array_push($exts, 'variables');

							$actions .= RCUBE_SIEVE_INDENT . "fileinto" . $args . " \"" . $this->_escape_string($action['target']) . "\";" . RCUBE_SIEVE_NEWLINE;
							break;
						case 'redirect':
						case 'redirect_copy':
							$args = '';
							if ($action['type'] == 'redirect_copy') {
								array_push($exts, 'copy');
								$args .= ' :copy';
							}

							$tokens = preg_split('/[,;\s]/', $action['target']);
							foreach ($tokens as $email)
								$actions .= RCUBE_SIEVE_INDENT . "redirect" . $args . " \"" . $this->_escape_string($email) . "\";" . RCUBE_SIEVE_NEWLINE;
							break;
						case 'reject':
						case 'ereject':
							array_push($exts, $action['type']);

							if (strpos($action['target'], "\n")!==false)
								$actions .= RCUBE_SIEVE_INDENT . $action['type']." text:" . RCUBE_SIEVE_NEWLINE . $action['target'] . RCUBE_SIEVE_NEWLINE . "." . RCUBE_SIEVE_NEWLINE . ";" . RCUBE_SIEVE_NEWLINE;
							else
								$actions .= RCUBE_SIEVE_INDENT . $action['type']." \"" . $this->_escape_string($action['target']) . "\";" . RCUBE_SIEVE_NEWLINE;

							break;
						case 'vacation':
							array_push($exts, 'vacation');
							$action['subject'] = $this->_escape_string($action['subject']);

//							// encoding subject header with mb_encode provides better results with asian characters
//							if (function_exists("mb_encode_mimeheader"))
//							{
//								mb_internal_encoding($action['charset']);
//								$action['subject'] = mb_encode_mimeheader($action['subject'], $action['charset'], 'Q');
//								mb_internal_encoding(RCUBE_CHARSET);
//							}

							// detect original recipient
							if ($action['from'] == 'auto' && strpos($variables, 'set "from"') === false) {
								array_push($exts, 'variables');

								$variables .= 'set "from" "";' . RCUBE_SIEVE_NEWLINE;
								$variables .= 'if header :matches "to" "*" {' . RCUBE_SIEVE_NEWLINE;
								$variables .= RCUBE_SIEVE_INDENT . 'set "from" "${1}";' . RCUBE_SIEVE_NEWLINE;
								$variables .= '}' . RCUBE_SIEVE_NEWLINE;

								$action['from'] = "\${from}";
							}
							elseif ($action['from'] == 'auto') {
								$action['from'] = "\${from}";
							}

							// append original subject
							if ($action['origsubject'] == '1' && strpos($variables, 'set "subject"') === false) {
								array_push($exts, 'variables');

								$variables .= 'set "subject" "";' . RCUBE_SIEVE_NEWLINE;
								$variables .= 'if header :matches "subject" "*" {' . RCUBE_SIEVE_NEWLINE;
								$variables .= RCUBE_SIEVE_INDENT . 'set "subject" "${1}";' . RCUBE_SIEVE_NEWLINE;
								$variables .= '}' . RCUBE_SIEVE_NEWLINE;

								$action['subject'] = trim($action['subject']);
								if (substr($action['subject'], -1, 1) != ":") $action['subject'] .= ":";
								$action['subject'] .= " \${subject}";
							}

							$actions .= RCUBE_SIEVE_INDENT . "vacation" . RCUBE_SIEVE_NEWLINE;
							if (!empty($action['days'])) $actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":days ". $action['days'] . RCUBE_SIEVE_NEWLINE;
							if (!empty($action['addresses'])) $actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":addresses [\"". str_replace(",", "\",\"", $this->_escape_string($action['addresses'])) ."\"]" . RCUBE_SIEVE_NEWLINE;
							if (!empty($action['subject'])) $actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":subject \"". $action['subject'] ."\"" . RCUBE_SIEVE_NEWLINE;
							if (!empty($action['handle'])) $actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":handle \"". $this->_escape_string($action['handle']) ."\"" . RCUBE_SIEVE_NEWLINE;
							if (!empty($action['from'])) $actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":from \"". $this->_escape_string($action['from']) ."\"" . RCUBE_SIEVE_NEWLINE;

							if ($action['htmlmsg']) {
								$MAIL_MIME = new Mail_mime("\r\n");

								$action['msg'] = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">' .
									"\r\n<html><body>\r\n" . $action['msg'] . "\r\n</body></html>\r\n";

								$MAIL_MIME->setHTMLBody($action['msg']);

								// add a plain text version of the e-mail as an alternative part.
								$h2t = new rcube_html2text($action['msg'], false, true, 0);
								$plainTextPart = $h2t->get_text();
								if (!$plainTextPart) {
									// empty message body breaks attachment handling in drafts
									$plainTextPart = "\r\n";
								}
								else {
									// make sure all line endings are CRLF (#1486712)
									$plainTextPart = preg_replace('/\r?\n/', "\r\n", $plainTextPart);
								}

								$MAIL_MIME->setTXTBody($plainTextPart);

								$MAIL_MIME->setParam('html_charset', $action['charset']);
								$MAIL_MIME->setParam('text_charset', $action['charset']);

								$action['msg'] = $MAIL_MIME->getMessage();
							}

							// escape lines which start is a .
							$action['msg'] = preg_replace('/(^|\r?\n)\./', "$1..", $action['msg']);

							if ($action['htmlmsg'])
								$actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":mime text:". RCUBE_SIEVE_NEWLINE . $action['msg'] . RCUBE_SIEVE_NEWLINE . "." . RCUBE_SIEVE_NEWLINE . ";" . RCUBE_SIEVE_NEWLINE;
							elseif ($action['charset'] != "UTF-8")
								$actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":mime text:". RCUBE_SIEVE_NEWLINE ."Content-Type: text/plain; charset=". $action['charset'] . RCUBE_SIEVE_NEWLINE . RCUBE_SIEVE_NEWLINE . $action['msg'] . RCUBE_SIEVE_NEWLINE . "." . RCUBE_SIEVE_NEWLINE . ";" . RCUBE_SIEVE_NEWLINE;
							elseif (strpos($action['msg'], "\n") !== false)
								$actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . "text:" . RCUBE_SIEVE_NEWLINE . $action['msg'] . RCUBE_SIEVE_NEWLINE . "." . RCUBE_SIEVE_NEWLINE . ";" . RCUBE_SIEVE_NEWLINE;
							else
								$actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . "\"" . $this->_escape_string($action['msg']) . "\";" . RCUBE_SIEVE_NEWLINE;

							break;
						case 'imapflags':
						case 'imap4flags':
							array_push($exts, $action['type']);

							if (strpos($actions, "setflag") !== false)
								$actions .= RCUBE_SIEVE_INDENT . "addflag \"" . $this->_escape_string($action['target']) . "\";" . RCUBE_SIEVE_NEWLINE;
							else
								$actions .= RCUBE_SIEVE_INDENT . "setflag \"" . $this->_escape_string($action['target']) . "\";" . RCUBE_SIEVE_NEWLINE;

							break;
						case 'notify':
							array_push($exts, 'notify');
							$actions .= RCUBE_SIEVE_INDENT . "notify" . RCUBE_SIEVE_NEWLINE;
							$actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":method \"" . $this->_escape_string($action['method']) . "\"" . RCUBE_SIEVE_NEWLINE;
							if (!empty($action['options'])) $actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":options [\"" . str_replace(",", "\",\"", $this->_escape_string($action['options'])) . "\"]" . RCUBE_SIEVE_NEWLINE;
							if (!empty($action['from'])) $actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":from \"" . $this->_escape_string($action['from']) . "\"" . RCUBE_SIEVE_NEWLINE;
							if (!empty($action['importance'])) $actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":importance \"" . $this->_escape_string($action['importance']) . "\"" . RCUBE_SIEVE_NEWLINE;
							$actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":message \"". $this->_escape_string($action['msg']) ."\";" . RCUBE_SIEVE_NEWLINE;
							break;
						case 'enotify':
							array_push($exts, 'enotify');
							$actions .= RCUBE_SIEVE_INDENT . "notify" . RCUBE_SIEVE_NEWLINE;
							if (!empty($action['options'])) $actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":options [\"" . str_replace(",", "\",\"", $this->_escape_string($action['options'])) . "\"]" . RCUBE_SIEVE_NEWLINE;
							if (!empty($action['from'])) $actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":from \"" . $this->_escape_string($action['from']) . "\"" . RCUBE_SIEVE_NEWLINE;
							if (!empty($action['importance'])) $actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":importance \"" . $this->_escape_string($action['importance']) . "\"" . RCUBE_SIEVE_NEWLINE;
							$actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . ":message \"". $this->_escape_string($action['msg']) ."\"" . RCUBE_SIEVE_NEWLINE;
							$actions .= RCUBE_SIEVE_INDENT . RCUBE_SIEVE_INDENT . "\"" . $this->_escape_string($action['method']) . "\";" . RCUBE_SIEVE_NEWLINE;
							break;
						case 'editheaderadd':
							array_push($exts, 'editheader');
							$actions .= RCUBE_SIEVE_INDENT . "addheader";

							if ($action['index'] == 'last')
								$actions .= " :last";

							$actions .= " \"". $this->_escape_string($action['name']) ."\" \"". $this->_escape_string($action['value']) ."\";" . RCUBE_SIEVE_NEWLINE;
							break;
						case 'editheaderrem':
							array_push($exts, 'editheader');
							$actions .= RCUBE_SIEVE_INDENT . "deleteheader";

							if (is_numeric($action['index']))
								$actions .= " :index " . $action['index'];
							elseif ($action['index'] == 'last')
								$actions .= " :last";

							if (strlen($action['operator']) > 0)
								$actions .= " :" . $action['operator'];

							$actions .= " \"". $this->_escape_string($action['name']) ."\"";

							if (strlen($action['value']) > 0)
								$actions .= " \"". $this->_escape_string($action['value']) ."\"";

							$actions .= ";" . RCUBE_SIEVE_NEWLINE;
							break;
						case 'keep':
						case 'discard':
						case 'stop':
							$actions .= RCUBE_SIEVE_INDENT . $action['type'] .";" . RCUBE_SIEVE_NEWLINE;
							break;
					}
				}

				$script .= $actions . "}" . RCUBE_SIEVE_NEWLINE;
			}
		}

		if ($variables)
			$variables .= RCUBE_SIEVE_NEWLINE;

		// requires
		$exts = array_unique($exts);
		if (sizeof($exts))
			$script = 'require ["' . implode('","', $exts) . "\"];" . RCUBE_SIEVE_NEWLINE . RCUBE_SIEVE_NEWLINE . $variables . $script;

		// author
		if ($script && RCUBE_SIEVE_HEADER)
			$script = RCUBE_SIEVE_HEADER . RCUBE_SIEVE_NEWLINE . $script;

		return $script;
	}

	public function as_array()
	{
		return $this->content;
	}

	public function parse_text($script)
	{
		$i = 0;
		$content = array();

		// remove C comments
		$script = preg_replace('|/\*.*?\*/|sm', '', $script);

		// tokenize rules - \r is optional for backward compatibility (added 20090413)
		if ($tokens = preg_split('/(# rule:\[.*\])\r?\n/', $script, -1, PREG_SPLIT_DELIM_CAPTURE)) {
			foreach($tokens as $token) {
				if (preg_match('/^# rule:\[(.*)\]/', $token, $matches)) {
					$content[$i]['name'] = $matches[1];
				}
				elseif (isset($content[$i]['name']) && sizeof($content[$i]) == 1 && preg_match('/^# disabledRule:\[(.*)\]/', $token, $matches)) {
					$content[$i] = unserialize($this->_regular_serial($matches[1]));
					$i++;
				}
				elseif (isset($content[$i]['name']) && sizeof($content[$i]) == 1) {
					if ($rule = $this->_tokenize_rule($token)) {
						$content[$i] = array_merge($content[$i], $rule);
						$i++;
					}
					else {
						unset($content[$i]);
					}
				}
			}
		}

		return $content;
	}

	private function _tokenize_rule($content)
	{
		$result = NULL;

		if (preg_match('/^(if|elsif|else)\s+((true|not\s+true|allof|anyof|exists|header|not|size|envelope|address|spamtest|virustest|date|currentdate)\s+(.*))\s+\{(.*)\}$/sm', trim($content), $matches)) {
			list($tests, $join) = $this->_parse_tests(trim($matches[2]));
			$actions = $this->_parse_actions(trim($matches[5]));

			if ($tests && $actions) {
				$result = array(
							'tests' => $tests,
							'actions' => $actions,
							'join' => $join,
							);
			}
		}

		return $result;
	}

	private function _parse_actions($content)
	{
		$content = str_replace("\r\n", "\n", $content);
		$result = NULL;

		// supported actions
		$patterns[] = '^\s*discard;';
		$patterns[] = '^\s*keep;';
		$patterns[] = '^\s*stop;';
		$patterns[] = '^\s*fileinto\s+(:copy\s+)?(:create\s+)?(.*?[^\\\]);';
		$patterns[] = '^\s*redirect\s+(:copy\s+)?(.*?[^\\\]);';
		$patterns[] = '^\s*setflag\s+(.*?[^\\\]);';
		$patterns[] = '^\s*addflag\s+(.*?[^\\\]);';
		$patterns[] = '^\s*reject\s+text:(.*)\n\.\n;';
		$patterns[] = '^\s*ereject\s+text:(.*)\n\.\n;';
		$patterns[] = '^\s*reject\s+(.*?[^\\\]);';
		$patterns[] = '^\s*ereject\s+(.*?[^\\\]);';
		$patterns[] = '^\s*vacation\s+(:days\s+([0-9]+)\s+)?(:addresses\s+\[(.*?[^\\\])\]\s+)?(:subject\s+(".*?[^"\\\]")\s+)?(:handle\s+(".*?[^"\\\]")\s+)?(:from\s+(".*?[^"\\\]")\s+)?(:mime\s+)?text:(.*)\n\.\n;';
		$patterns[] = '^\s*vacation\s+(:days\s+([0-9]+)\s+)?(:addresses\s+\[(.*?[^\\\])\]\s+)?(:subject\s+(".*?[^"\\\]")\s+)?(:handle\s+(".*?[^"\\\]")\s+)?(:from\s+(".*?[^"\\\]")\s+)?(.*?[^\\\]);';
		$patterns[] = '^\s*notify\s+:method\s+(".*?[^"\\\]")\s+(:options\s+\[(.*?[^\\\])\]\s+)?(:from\s+(".*?[^"\\\]")\s+)?(:importance\s+(".*?[^"\\\]")\s+)?:message\s+(".*?[^"\\\]");';
		$patterns[] = '^\s*notify\s+(:options\s+\[(.*?[^\\\])\]\s+)?(:from\s+(".*?[^"\\\]")\s+)?(:importance\s+(".*?[^"\\\]")\s+)?:message\s+(".*?[^"\\\]")\s+(.*);';
		$patterns[] = '^\s*addheader\s+(:(last))?\s*(".*?[^"\\\]")\s+(".*?[^"\\\]");';
		$patterns[] = '^\s*deleteheader\s+(:(last)|:index\s([0-9])+)?\s*(:(contains))?\s*(".*?[^"\\\]")\s*(".*?[^"\\\]")?;';

		$pattern = '/(' . implode('$)|(', $patterns) . '$)/ms';

		// parse actions body
		if (preg_match_all($pattern, $content, $mm, PREG_SET_ORDER)) {
			foreach ($mm as $m) {
				$content = trim($m[0]);

				if (preg_match('/^(discard|keep|stop)/', $content, $matches)) {
					$result[] = array('type' => $matches[1]);
				}
				elseif (preg_match('/^fileinto\s+:copy/', $content)) {
					$result[] = array('type' => 'fileinto_copy', 'target' => $this->_parse_string($m[sizeof($m)-1]));
				}
				elseif (preg_match('/^fileinto/', $content)) {
					$result[] = array('type' => 'fileinto', 'target' => $this->_parse_string($m[sizeof($m)-1]));
				}
				elseif (preg_match('/^redirect\s+:copy/', $content)) {
					$result[] = array('type' => 'redirect_copy', 'target' => $this->_parse_string($m[sizeof($m)-1]));
				}
				elseif (preg_match('/^redirect/', $content)) {
					$result[] = array('type' => 'redirect', 'target' => $this->_parse_string($m[sizeof($m)-1]));
				}
				elseif (preg_match('/^(reject|ereject)\s+(.*);$/sm', $content, $matches)) {
					$result[] = array('type' => $matches[1], 'target' => $this->_parse_string($matches[2]));
				}
				elseif (preg_match('/^(setflag|addflag)/', $content)) {
					if (in_array('imap4flags', $this->supported))
						$result[] = array('type' => 'imap4flags', 'target' => $this->_parse_string($m[sizeof($m)-1]));
					else
						$result[] = array('type' => 'imapflags', 'target' => $this->_parse_string($m[sizeof($m)-1]));
				}
				elseif (preg_match('/^vacation\s+(:days\s+([0-9]+)\s+)?(:addresses\s+\[(.*?[^\\\])\]\s+)?(:subject\s+(".*?[^"\\\]")\s+)?(:handle\s+(".*?[^"\\\]")\s+)?(:from\s+(".*?[^"\\\]")\s+)?(.*);$/sm', $content, $matches)) {
					$origsubject = "";
					if (substr($matches[6], -13, 12) == ": \${subject}") {
						$matches[6] = trim(substr($matches[6], 0, -13)) . "\"";
						$origsubject = "1";
					}

					if ($matches[10] == "\"\${from}\"")
						$matches[10] = "\"auto\"";

//					if (function_exists("mb_decode_mimeheader")) $matches[5] = mb_decode_mimeheader($matches[5]);

					if (strpos($matches[11], 'Content-Type: multipart/alternative') !== false) {
						$htmlmsg = true;

						preg_match('/Content-Type: text\/html; charset=([^\r\n]+).*<body>(.+)<\/body>/sm', $matches[11], $htmlparts);
						$msg = quoted_printable_decode($htmlparts[2]);
						$charset = $htmlparts[1];
					}
					else {
						$htmlmsg = false;
						$msg = $this->_parse_string($matches[11]);
						$charset = $this->_parse_charset($matches[11]);
					}

					// unescape lines which start is a .
					$msg = preg_replace('/(^|\r?\n)\.\./', "$1.", $msg);

					$result[] = array('type' => 'vacation',
									'days' => $matches[2],
									'subject' => $this->_parse_string($matches[6]),
									'origsubject' => $origsubject,
									'from' => $this->_parse_string($matches[10]),
									'addresses' => $this->_parse_string(str_replace("\",\"", ",", $matches[4])),
									'handle' => $this->_parse_string($matches[8]),
									'msg' => $msg,
									'htmlmsg' => $htmlmsg,
									'charset' => $charset);
				}
				elseif (preg_match('/^notify\s+:method\s+(".*?[^"\\\]")\s+(:options\s+\[(.*?[^\\\])\]\s+)?(:from\s+(".*?[^"\\\]")\s+)?(:importance\s+(".*?[^"\\\]")\s+)?:message\s+(".*?[^"\\\]");$/sm', $content, $matches)) {
					$result[] = array('type' => 'notify',
									'method' => $this->_parse_string($matches[1]),
									'options' => $this->_parse_string($matches[3]),
									'from' => $this->_parse_string($matches[5]),
									'importance' => $this->_parse_string($matches[7]),
									'msg' => $this->_parse_string($matches[8]));
				}
				elseif (preg_match('/^notify\s+(:options\s+\[(.*?[^\\\])\]\s+)?(:from\s+(".*?[^"\\\]")\s+)?(:importance\s+(".*?[^"\\\]")\s+)?:message\s+(".*?[^"\\\]")\s+(.*);$/sm', $content, $matches)) {
					$result[] = array('type' => 'enotify',
									'method' => $this->_parse_string($matches[8]),
									'options' => $this->_parse_string($matches[2]),
									'from' => $this->_parse_string($matches[4]),
									'importance' => $this->_parse_string($matches[6]),
									'msg' => $this->_parse_string($matches[7]));
				}
				elseif (preg_match('/^addheader/', $content)) {
					$result[] = array('type' => 'editheaderadd',
									'index' => $m[sizeof($m)-3],
									'name' => $this->_parse_string($m[sizeof($m)-2]),
									'value' => $this->_parse_string($m[sizeof($m)-1]));
				}
				elseif (preg_match('/^deleteheader/', $content)) {
					$result[] = array('type' => 'editheaderrem',
									'index' => $m[sizeof($m)-6] == 'last' ? $m[sizeof($m)-6] : $m[sizeof($m)-5],
									'operator' => $m[sizeof($m)-3],
									'name' => strlen($m[sizeof($m)-2]) == 0 ? $this->_parse_string($m[sizeof($m)-1]) : $this->_parse_string($m[sizeof($m)-2]),
									'value' => strlen($m[sizeof($m)-2]) == 0 ? '' : $this->_parse_string($m[sizeof($m)-1]));
				}
			}
		}

		return $result;
	}

	private function _parse_tests($content)
	{
		$result = NULL;

		// lists
		if (preg_match('/^(allof|anyof)\s+\((.*)\)$/sm', $content, $matches)) {
			$content = $matches[2];
			$join = $matches[1]=='allof' ? true : false;
		}
		else {
			$join = false;
		}

		// supported tests regular expressions
		$patterns[] = '(not\s+)?(exists)\s+\[(.*?[^\\\])\]';
		$patterns[] = '(not\s+)?(exists)\s+(".*?[^\\\]")';
		$patterns[] = '(not\s+)?(true)';
		$patterns[] = '(not\s+)?(size)\s+:(under|over)\s+([0-9]+[KGM]{0,1})';
		$patterns[] = '(not\s+)?(spamtest|virustest)\s+:value\s+"(eq|ge|le)"\s+:comparator\s+"i;ascii-numeric"\s+"(.*?[^\\\])"';
		$patterns[] = '(not\s+)?(header|address|envelope)\s+:(contains|is|matches|regex|user|detail|domain)((\s+))\[(.*?[^\\\]")\]\s+\[(.*?[^\\\]")\]';
		$patterns[] = '(not\s+)?(header|address|envelope)\s+:(contains|is|matches|regex|user|detail|domain)((\s+))(".*?[^\\\]")\s+(".*?[^\\\]")';
		$patterns[] = '(not\s+)?(header|address|envelope)\s+:(contains|is|matches|regex|user|detail|domain)((\s+))\[(.*?[^\\\]")\]\s+(".*?[^\\\]")';
		$patterns[] = '(not\s+)?(header|address|envelope)\s+:(contains|is|matches|regex|user|detail|domain)((\s+))(".*?[^\\\]")\s+\[(.*?[^\\\]")\]';
		$patterns[] = '(not\s+)?(header|address|envelope)\s+:(count\s+".*?[^\\\]"|value\s+".*?[^\\\]")(\s+:comparator\s+"(.*?[^\\\])")?\s+\[(.*?[^\\\]")\]\s+\[(.*?[^\\\]")\]';
		$patterns[] = '(not\s+)?(header|address|envelope)\s+:(count\s+".*?[^\\\]"|value\s+".*?[^\\\]")(\s+:comparator\s+"(.*?[^\\\])")?\s+(".*?[^\\\]")\s+(".*?[^\\\]")';
		$patterns[] = '(not\s+)?(header|address|envelope)\s+:(count\s+".*?[^\\\]"|value\s+".*?[^\\\]")(\s+:comparator\s+"(.*?[^\\\])")?\s+\[(.*?[^\\\]")\]\s+(".*?[^\\\]")';
		$patterns[] = '(not\s+)?(header|address|envelope)\s+:(count\s+".*?[^\\\]"|value\s+".*?[^\\\]")(\s+:comparator\s+"(.*?[^\\\])")?\s+(".*?[^\\\]")\s+\[(.*?[^\\\]")\]';
		$patterns[] = '(not\s+)?(body)(\s+:(raw|text|content\s+".*?[^\\\]"))?\s+:(contains|is|matches|regex)((\s+))\[(.*?[^\\\]")\]';
		$patterns[] = '(not\s+)?(body)(\s+:(raw|text|content\s+".*?[^\\\]"))?\s+:(contains|is|matches|regex)((\s+))(".*?[^\\\]")';
		$patterns[] = '(not\s+)?(body)(\s+:(raw|text|content\s+".*?[^\\\]"))?\s+:(count\s+".*?[^\\\]"|value\s+".*?[^\\\]")(\s+:comparator\s+"(.*?[^\\\])")?\s+\[(.*?[^\\\]")\]';
		$patterns[] = '(not\s+)?(body)(\s+:(raw|text|content\s+".*?[^\\\]"))?\s+:(count\s+".*?[^\\\]"|value\s+".*?[^\\\]")(\s+:comparator\s+"(.*?[^\\\])")?\s+(".*?[^\\\]")';
		$patterns[] = '(not\s+)?(date|currentdate)(\s+:zone\s+"([\+\-][0-9]{4})")?\s+:(contains|is|matches|regex)((\s+))(".*?[^\\\]"\s+)?(".*?[^\\\]")\s+(".*?[^\\\]")';
		$patterns[] = '(not\s+)?(date|currentdate)(\s+:zone\s+"([\+\-][0-9]{4})")?\s+:(count\s+".*?[^\\\]"|value\s+".*?[^\\\]")(\s+:comparator\s+"(.*?[^\\\])")?(\s+".*?[^\\\]")?\s+(".*?[^\\\]")\s+(".*?[^\\\]")';

		// join patterns...
		$pattern = '/(' . implode(')|(', $patterns) . ')/';

		// ...and parse tests list
		if (preg_match_all($pattern, $content, $matches, PREG_SET_ORDER)) {
			foreach ($matches as $match) {
				$size = sizeof($match);

				if (preg_match('/^(not\s+)?size/', $match[0])) {
					$result[] = array(
									'type'		=> 'size',
									'not'		=> $match[$size-4] ? true : false,
									'operator'	=> $match[$size-2], // under/over
									'target'	=> $match[$size-1], // value
								);
				}
				elseif (preg_match('/^(not\s+)?(spamtest|virustest)/', $match[0])) {
					$result[] = array(
									'type'		=> $match[$size-3],
									'not'		=> $match[$size-4] ? true : false,
									'operator'	=> $match[$size-2], // ge/le/eq
									'target'	=> $match[$size-1], // value
								);
				}
				elseif (preg_match('/^(not\s+)?(header|address|envelope)/', $match[0])) {
					$result[] = array(
									'type'			=> $match[$size-6],
									'not'			=> $match[$size-7] ? true : false,
									'operator'		=> $match[$size-5], // is/contains/matches
									'header'		=> $this->_parse_list($match[$size-2]), // header(s)
									'target'		=> $this->_parse_list($match[$size-1], ($match[$size-5] == 'regex' ? true : false)), // string(s)
									'comparator'	=> trim($match[$size-3])
								);
				}
				elseif (preg_match('/^(not\s+)?exists/', $match[0])) {
					$result[] = array(
									'type'		=> 'exists',
									'not'		=> $match[$size-3] ? true : false,
									'operator'	=> 'exists',
									'header'	=> $this->_parse_list($match[$size-1]), // header(s)
								);
				}
				elseif (preg_match('/^(not\s+)?true/', $match[0])) {
					$result[] = array(
									'type'	=> 'true',
									'not'	=> $match[$size-2] ? true : false,
								);
				}
				elseif (preg_match('/^(not\s+)?body/', $match[0])) {
					if (preg_match('/.*content\s+"(.*?[^\\\])".*/', $match[$size-5], $parts)) {
						$bodypart = 'content';
						$contentpart = $parts[1];
					}
					else {
						$bodypart = $match[$size-5];
						$contentpart = '';
					}

					$result[] = array(
									'type'		=> 'body',
									'not'		=> $match[$size-8] ? true : false,
									'bodypart'	=> $bodypart,
									'contentpart' => $contentpart,
									'operator'	=> $match[$size-4], // is/contains/matches
									'header'	=> 'body', // header(s)
									'target'	=> $this->_parse_list($match[$size-1], ($match[$size-4] == 'regex' ? true : false)), // string(s)
									'comparator' => trim($match[$size-2])
								);
				}
				elseif (preg_match('/^(not\s+)?(date|currentdate)/', $match[0])) {
					$result[] = array(
									'type'			=> 'date',
									'not'			=> $match[$size-10] ? true : false,
									'header'		=> $match[$size-9], // header
									'operator'		=> $match[$size-6], // is/contains/matches
									'datepart'		=> $this->_parse_list($match[$size-2]),
									'target'		=> $this->_parse_list($match[$size-1], ($match[$size-5] == 'regex' ? true : false)), // string(s)
									'field'			=> $match[$size-3], // received
									'comparator'	=> trim($match[$size-4])
								);
				}
			}
		}

		return array($result, $join);
	}

	private function _parse_string($content)
	{
		$text = '';
		$content = trim($content);

		if (preg_match('/^:mime\s+text:(.*)\.$/sm', $content, $matches)) {
			$parts = preg_split("/\r?\n/", $matches[1], 4);
			$text = trim($parts[3]);
		}
		elseif (preg_match('/^text:(.*)\.$/sm', $content, $matches))
			$text = trim($matches[1]);
		elseif (preg_match('/^"(.*)"$/', $content, $matches))
			$text = str_replace('\"', '"', $matches[1]);

		return $text;
	}

	private function _parse_charset($content)
	{
		$charset = RCUBE_CHARSET;
		$content = trim($content);

		if (preg_match('/^:mime\s+text:(.*)\.$/sm', $content, $matches)) {
			$parts = preg_split("/\r?\n/", $matches[1], 4);

			$charset = trim(substr($parts[1], stripos($parts[1], "charset=") + 8));
		}

		return $charset;
	}

	private function _escape_string($content)
	{
		$replace['/"/'] = '\\"';

		if (is_array($content)) {
			for ($x=0, $y=sizeof($content); $x<$y; $x++)
				$content[$x] = preg_replace(array_keys($replace), array_values($replace), $content[$x]);

			return $content;
		}
		else {
			return preg_replace(array_keys($replace), array_values($replace), $content);
		}
	}

	private function _parse_list($content, $regex = false)
	{
		$result = array();

		if ($regex) {
			if (preg_match('/^"(.*)"$/', $content, $matches));
				$content = $matches[1];

			$content = str_replace('\"', '"', $content);
			return $content;
		}

		for ($x=0, $len=strlen($content); $x<$len; $x++) {
			switch ($content[$x]) {
				case '\\':
					$str .= $content[++$x];

					break;
				case '"':
					if (isset($str)) {
						$result[] = $str;
						unset($str);
					}
					else {
						$str = '';
					}

					break;
				default:
					if (isset($str))
						$str .= $content[$x];

					break;
			}
		}

		if (sizeof($result)>1)
			return $result;
		elseif (sizeof($result) == 1)
			return $result[0];
		else
			return NULL;
	}

	private function _safe_serial($data)
	{
		$data = str_replace("\r", "[!r]", $data);
		$data = str_replace("\n", "[!n]", $data);
		return $data;
	}

	private function _regular_serial($data)
	{
		$data = str_replace("[!r]", "\r", $data);
		$data = str_replace("[!n]", "\n", $data);
		return $data;
	}
}

?>