rcube_message.php
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rcube_message.php
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	<?php

	/*
	+-----------------------------------------------------------------------+
	\| program/include/rcube_message.php \|
	\| \|
	\| This file is part of the Roundcube Webmail client \|
	\| Copyright (C) 2008-2010, The Roundcube Dev Team \|
	\| Licensed under the GNU GPL \|
	\| \|
	\| PURPOSE: \|
	\| Logical representation of a mail message with all its data \|
	\| and related functions \|
	+-----------------------------------------------------------------------+
	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	+-----------------------------------------------------------------------+

	$Id$

	*/


	/**
	* Logical representation of a mail message with all its data
	* and related functions
	*
	* @package Mail
	* @author Thomas Bruederli <roundcube@gmail.com>
	*/
	class rcube_message
	{
	/**
	* Instace of rcmail.
	*
	* @var rcmail
	*/
	private $app;

	/**
	* Instance of imap class
	*
	* @var rcube_imap
	*/
	private $imap;
	private $opt = array();
	private $inline_parts = array();
	private $parse_alternative = false;

	public $uid = null;
	public $headers;
	public $structure;
	public $parts = array();
	public $mime_parts = array();
	public $attachments = array();
	public $subject = '';
	public $sender = null;
	public $is_safe = false;


	/**
	* __construct
	*
	* Provide a uid, and parse message structure.
	*
	* @param string $uid The message UID.
	*
	* @uses rcmail::get_instance()
	* @uses rcube_imap::decode_mime_string()
	* @uses self::set_safe()
	*
	* @see self::$app, self::$imap, self::$opt, self::$structure
	*/
	function __construct($uid)
	{
	$this->app = rcmail::get_instance();
	$this->imap = $this->app->imap;
	$this->imap->get_all_headers = true;

	$this->uid = $uid;
	$this->headers = $this->imap->get_message($uid);

	if (!$this->headers)
	return;

	$this->subject = rcube_imap::decode_mime_string(
	$this->headers->subject, $this->headers->charset);
	list(, $this->sender) = each($this->imap->decode_address_list($this->headers->from));

	$this->set_safe((intval($_GET['_safe']) \|\| $_SESSION['safe_messages'][$uid]));
	$this->opt = array(
	'safe' => $this->is_safe,
	'prefer_html' => $this->app->config->get('prefer_html'),
	'get_url' => rcmail_url('get', array(
	'_mbox' => $this->imap->get_mailbox_name(), '_uid' => $uid))
	);

	if (!empty($this->headers->structure)) {
	$this->get_mime_numbers($this->headers->structure);
	$this->parse_structure($this->headers->structure);
	}
	else {
	$this->body = $this->imap->get_body($uid);
	}

	// notify plugins and let them analyze this structured message object
	$this->app->plugins->exec_hook('message_load', array('object' => $this));
	}


	/**
	* Return a (decoded) message header
	*
	* @param string $name Header name
	* @param bool $row Don't mime-decode the value
	* @return string Header value
	*/
	public function get_header($name, $raw = false)
	{
	if ($this->headers->$name)
	$value = $this->headers->$name;
	else if ($this->headers->others[$name])
	$value = $this->headers->others[$name];

	return $raw ? $value : $this->imap->decode_header($value);
	}


	/**
	* Set is_safe var and session data
	*
	* @param bool $safe enable/disable
	*/
	public function set_safe($safe = true)
	{
	$this->is_safe = $safe;
	$_SESSION['safe_messages'][$this->uid] = $this->is_safe;
	}


	/**
	* Compose a valid URL for getting a message part
	*
	* @param string $mime_id Part MIME-ID
	* @return string URL or false if part does not exist
	*/
	public function get_part_url($mime_id)
	{
	if ($this->mime_parts[$mime_id])
	return $this->opt['get_url'] . '&_part=' . $mime_id;
	else
	return false;
	}


	/**
	* Get content of a specific part of this message
	*
	* @param string $mime_id Part MIME-ID
	* @param resource $fp File pointer to save the message part
	* @return string Part content
	*/
	public function get_part_content($mime_id, $fp=NULL)
	{
	if ($part = $this->mime_parts[$mime_id]) {
	// stored in message structure (winmail/inline-uuencode)
	if ($part->encoding == 'stream') {
	if ($fp) {
	fwrite($fp, $part->body);
	}
	return $fp ? true : $part->body;
	}
	// get from IMAP
	return $this->imap->get_message_part($this->uid, $mime_id, $part, NULL, $fp);
	} else
	return null;
	}


	/**
	* Determine if the message contains a HTML part
	*
	* @return bool True if a HTML is available, False if not
	*/
	function has_html_part()
	{
	// check all message parts
	foreach ($this->parts as $pid => $part) {
	$mimetype = strtolower($part->ctype_primary . '/' . $part->ctype_secondary);
	if ($mimetype == 'text/html')
	return true;
	}

	return false;
	}


	/**
	* Return the first HTML part of this message
	*
	* @return string HTML message part content
	*/
	function first_html_part()
	{
	// check all message parts
	foreach ($this->mime_parts as $mime_id => $part) {
	$mimetype = strtolower($part->ctype_primary . '/' . $part->ctype_secondary);
	if ($mimetype == 'text/html') {
	return $this->imap->get_message_part($this->uid, $mime_id, $part);
	}
	}
	}


	/**
	* Return the first text part of this message
	*
	* @param rcube_message_part $part Reference to the part if found
	* @return string Plain text message/part content
	*/
	function first_text_part(&$part=null)
	{
	// no message structure, return complete body
	if (empty($this->parts))
	return $this->body;

	// check all message parts
	foreach ($this->mime_parts as $mime_id => $part) {
	$mimetype = $part->ctype_primary . '/' . $part->ctype_secondary;

	if ($mimetype == 'text/plain') {
	return $this->imap->get_message_part($this->uid, $mime_id, $part);
	}
	else if ($mimetype == 'text/html') {
	$out = $this->imap->get_message_part($this->uid, $mime_id, $part);

	// remove special chars encoding
	$trans = array_flip(get_html_translation_table(HTML_ENTITIES));
	$out = strtr($out, $trans);

	// create instance of html2text class
	$txt = new html2text($out);
	return $txt->get_text();
	}
	}

	$part = null;
	return null;
	}


	/**
	* Raad the message structure returend by the IMAP server
	* and build flat lists of content parts and attachments
	*
	* @param rcube_message_part $structure Message structure node
	* @param bool $recursive True when called recursively
	*/
	private function parse_structure($structure, $recursive = false)
	{
	// real content-type of message/rfc822 part
	if ($structure->mimetype == 'message/rfc822' && $structure->real_mimetype)
	$mimetype = $structure->real_mimetype;
	else
	$mimetype = $structure->mimetype;

	// show message headers
	if ($recursive && is_array($structure->headers) && isset($structure->headers['subject'])) {
	$c = new stdClass;
	$c->type = 'headers';
	$c->headers = &$structure->headers;
	$this->parts[] = $c;
	}

	// Allow plugins to handle message parts
	$plugin = $this->app->plugins->exec_hook('message_part_structure',
	array('object' => $this, 'structure' => $structure,
	'mimetype' => $mimetype, 'recursive' => $recursive));

	if ($plugin['abort'])
	return;

	$structure = $plugin['structure'];
	list($message_ctype_primary, $message_ctype_secondary) = explode('/', $plugin['mimetype']);

	// print body if message doesn't have multiple parts
	if ($message_ctype_primary == 'text' && !$recursive) {
	$structure->type = 'content';
	$this->parts[] = &$structure;

	// Parse simple (plain text) message body
	if ($message_ctype_secondary == 'plain')
	foreach ((array)$this->uu_decode($structure) as $uupart) {
	$this->mime_parts[$uupart->mime_id] = $uupart;
	$this->attachments[] = $uupart;
	}
	}
	// the same for pgp signed messages
	else if ($mimetype == 'application/pgp' && !$recursive) {
	$structure->type = 'content';
	$this->parts[] = &$structure;
	}
	// message contains (more than one!) alternative parts
	else if ($mimetype == 'multipart/alternative'
	&& is_array($structure->parts) && count($structure->parts) > 1
	) {
	// get html/plaintext parts
	$plain_part = $html_part = $print_part = $related_part = null;

	foreach ($structure->parts as $p => $sub_part) {
	$sub_mimetype = $sub_part->mimetype;

	// check if sub part is
	if ($sub_mimetype == 'text/plain')
	$plain_part = $p;
	else if ($sub_mimetype == 'text/html')
	$html_part = $p;
	else if ($sub_mimetype == 'text/enriched')
	$enriched_part = $p;
	else if (in_array($sub_mimetype, array('multipart/related', 'multipart/mixed', 'multipart/alternative')))
	$related_part = $p;
	}

	// parse related part (alternative part could be in here)
	if ($related_part !== null && !$this->parse_alternative) {
	$this->parse_alternative = true;
	$this->parse_structure($structure->parts[$related_part], true);
	$this->parse_alternative = false;

	// if plain part was found, we should unset it if html is preferred
	if ($this->opt['prefer_html'] && count($this->parts))
	$plain_part = null;
	}

	// choose html/plain part to print
	if ($html_part !== null && $this->opt['prefer_html']) {
	$print_part = &$structure->parts[$html_part];
	}
	else if ($enriched_part !== null) {
	$print_part = &$structure->parts[$enriched_part];
	}
	else if ($plain_part !== null) {
	$print_part = &$structure->parts[$plain_part];
	}

	// add the right message body
	if (is_object($print_part)) {
	$print_part->type = 'content';
	$this->parts[] = $print_part;
	}
	// show plaintext warning
	else if ($html_part !== null && empty($this->parts)) {
	$c = new stdClass;
	$c->type = 'content';
	$c->ctype_primary = 'text';
	$c->ctype_secondary = 'plain';
	$c->body = rcube_label('htmlmessage');

	$this->parts[] = $c;
	}

	// add html part as attachment
	if ($html_part !== null && $structure->parts[$html_part] !== $print_part) {
	$html_part = &$structure->parts[$html_part];
	$html_part->filename = rcube_label('htmlmessage');
	$html_part->mimetype = 'text/html';

	$this->attachments[] = $html_part;
	}
	}
	// this is an ecrypted message -> create a plaintext body with the according message
	else if ($mimetype == 'multipart/encrypted') {
	$p = new stdClass;
	$p->type = 'content';
	$p->ctype_primary = 'text';
	$p->ctype_secondary = 'plain';
	$p->body = rcube_label('encryptedmessage');
	$p->size = strlen($p->body);
	}
	// message contains multiple parts
	else if (is_array($structure->parts) && !empty($structure->parts)) {
	// iterate over parts
	for ($i=0; $i < count($structure->parts); $i++) {
	$mail_part = &$structure->parts[$i];
	$primary_type = $mail_part->ctype_primary;
	$secondary_type = $mail_part->ctype_secondary;

	// real content-type of message/rfc822
	if ($mail_part->real_mimetype) {
	$part_orig_mimetype = $mail_part->mimetype;
	$part_mimetype = $mail_part->real_mimetype;
	list($primary_type, $secondary_type) = explode('/', $part_mimetype);
	}
	else
	$part_mimetype = $mail_part->mimetype;

	// multipart/alternative
	if ($primary_type == 'multipart') {
	$this->parse_structure($mail_part, true);

	// list message/rfc822 as attachment as well (mostly .eml)
	if ($part_orig_mimetype == 'message/rfc822' && !empty($mail_part->filename))
	$this->attachments[] = $mail_part;
	}
	// part text/[plain\|html] or delivery status
	else if ((($part_mimetype == 'text/plain' \|\| $part_mimetype == 'text/html') && $mail_part->disposition != 'attachment') \|\|
	in_array($part_mimetype, array('message/delivery-status', 'text/rfc822-headers', 'message/disposition-notification'))
	) {
	// Allow plugins to handle also this part
	$plugin = $this->app->plugins->exec_hook('message_part_structure',
	array('object' => $this, 'structure' => $mail_part,
	'mimetype' => $part_mimetype, 'recursive' => true));

	if ($plugin['abort'])
	continue;

	if ($part_mimetype == 'text/html') {
	$got_html_part = true;
	}

	$mail_part = $plugin['structure'];
	list($primary_type, $secondary_type) = explode('/', $plugin['mimetype']);

	// add text part if it matches the prefs
	if (!$this->parse_alternative \|\|
	($secondary_type == 'html' && $this->opt['prefer_html']) \|\|
	($secondary_type == 'plain' && !$this->opt['prefer_html'])
	) {
	$mail_part->type = 'content';
	$this->parts[] = $mail_part;
	}

	// list as attachment as well
	if (!empty($mail_part->filename))
	$this->attachments[] = $mail_part;
	}
	// part message/*
	else if ($primary_type == 'message') {
	$this->parse_structure($mail_part, true);

	// list as attachment as well (mostly .eml)
	if (!empty($mail_part->filename))
	$this->attachments[] = $mail_part;
	}
	// ignore "virtual" protocol parts
	else if ($primary_type == 'protocol') {
	continue;
	}
	// part is Microsoft Outlook TNEF (winmail.dat)
	else if ($part_mimetype == 'application/ms-tnef') {
	foreach ((array)$this->tnef_decode($mail_part) as $tpart) {
	$this->mime_parts[$tpart->mime_id] = $tpart;
	$this->attachments[] = $tpart;
	}
	}
	// part is a file/attachment
	else if (preg_match('/^(inline\|attach)/', $mail_part->disposition) \|\|
	$mail_part->headers['content-id'] \|\|
	($mail_part->filename &&
	(empty($mail_part->disposition) \|\| preg_match('/^[a-z0-9!#$&.+^_-]+$/i', $mail_part->disposition)))
	) {
	// skip apple resource forks
	if ($message_ctype_secondary == 'appledouble' && $secondary_type == 'applefile')
	continue;

	// part belongs to a related message and is linked
	if ($mimetype == 'multipart/related'
	&& ($mail_part->headers['content-id'] \|\| $mail_part->headers['content-location'])) {
	if ($mail_part->headers['content-id'])
	$mail_part->content_id = preg_replace(array('/^</', '/>$/'), '', $mail_part->headers['content-id']);
	if ($mail_part->headers['content-location'])
	$mail_part->content_location = $mail_part->headers['content-base'] . $mail_part->headers['content-location'];

	$this->inline_parts[] = $mail_part;
	}
	// attachment encapsulated within message/rfc822 part needs further decoding (#1486743)
	else if ($part_orig_mimetype == 'message/rfc822') {
	$this->parse_structure($mail_part, true);

	// list as attachment as well (mostly .eml)
	if (!empty($mail_part->filename))
	$this->attachments[] = $mail_part;
	}
	// regular attachment with valid content type
	// (content-type name regexp according to RFC4288.4.2)
	else if (preg_match('/^[a-z0-9!#$&.+^_-]+\/[a-z0-9!#$&.+^_-]+$/i', $part_mimetype)) {
	if (!$mail_part->filename)
	$mail_part->filename = 'Part '.$mail_part->mime_id;

	$this->attachments[] = $mail_part;
	}
	// attachment with invalid content type
	// replace malformed content type with application/octet-stream (#1487767)
	else if ($mail_part->filename) {
	$mail_part->ctype_primary = 'application';
	$mail_part->ctype_secondary = 'octet-stream';
	$mail_part->mimetype = 'application/octet-stream';

	$this->attachments[] = $mail_part;
	}
	}
	// attachment part as message/rfc822 (#1488026)
	else if ($mail_part->mimetype == 'message/rfc822') {
	$this->parse_structure($mail_part);
	}
	}

	// if this was a related part try to resolve references
	if ($mimetype == 'multipart/related' && sizeof($this->inline_parts)) {
	$a_replaces = array();
	$img_regexp = '/^image\/(gif\|jpe?g\|png\|tiff\|bmp\|svg)/';

	foreach ($this->inline_parts as $inline_object) {
	$part_url = $this->get_part_url($inline_object->mime_id);
	if ($inline_object->content_id)
	$a_replaces['cid:'.$inline_object->content_id] = $part_url;
	if ($inline_object->content_location) {
	$a_replaces[$inline_object->content_location] = $part_url;
	}

	if (!empty($inline_object->filename)) {
	// MS Outlook sends sometimes non-related attachments as related
	// In this case multipart/related message has only one text part
	// We'll add all such attachments to the attachments list
	if (!isset($got_html_part) && empty($inline_object->content_id)) {
	$this->attachments[] = $inline_object;
	}
	// MS Outlook sometimes also adds non-image attachments as related
	// We'll add all such attachments to the attachments list
	// Warning: some browsers support pdf in <img/>
	else if (!preg_match($img_regexp, $inline_object->mimetype)) {
	$this->attachments[] = $inline_object;
	}
	// @TODO: we should fetch HTML body and find attachment's content-id
	// to handle also image attachments without reference in the body
	// @TODO: should we list all image attachments in text mode?
	}
	}

	// add replace array to each content part
	// (will be applied later when part body is available)
	foreach ($this->parts as $i => $part) {
	if ($part->type == 'content')
	$this->parts[$i]->replaces = $a_replaces;
	}
	}
	}
	// message is a single part non-text
	else if ($structure->filename) {
	$this->attachments[] = $structure;
	}
	// message is a single part non-text (without filename)
	else if (preg_match('/application\//i', $mimetype)) {
	$structure->filename = 'Part '.$structure->mime_id;
	$this->attachments[] = $structure;
	}
	}


	/**
	* Fill aflat array with references to all parts, indexed by part numbers
	*
	* @param rcube_message_part $part Message body structure
	*/
	private function get_mime_numbers(&$part)
	{
	if (strlen($part->mime_id))
	$this->mime_parts[$part->mime_id] = &$part;

	if (is_array($part->parts))
	for ($i=0; $i<count($part->parts); $i++)
	$this->get_mime_numbers($part->parts[$i]);
	}


	/**
	* Decode a Microsoft Outlook TNEF part (winmail.dat)
	*
	* @param rcube_message_part $part Message part to decode
	* @return array
	*/
	function tnef_decode(&$part)
	{
	// @TODO: attachment may be huge, hadle it via file
	if (!isset($part->body))
	$part->body = $this->imap->get_message_part($this->uid, $part->mime_id, $part);

	$parts = array();
	$tnef = new tnef_decoder;
	$tnef_arr = $tnef->decompress($part->body);

	foreach ($tnef_arr as $pid => $winatt) {
	$tpart = new rcube_message_part;

	$tpart->filename = trim($winatt['name']);
	$tpart->encoding = 'stream';
	$tpart->ctype_primary = trim(strtolower($winatt['type']));
	$tpart->ctype_secondary = trim(strtolower($winatt['subtype']));
	$tpart->mimetype = $tpart->ctype_primary . '/' . $tpart->ctype_secondary;
	$tpart->mime_id = 'winmail.' . $part->mime_id . '.' . $pid;
	$tpart->size = $winatt['size'];
	$tpart->body = $winatt['stream'];

	$parts[] = $tpart;
	unset($tnef_arr[$pid]);
	}

	return $parts;
	}


	/**
	* Parse message body for UUencoded attachments bodies
	*
	* @param rcube_message_part $part Message part to decode
	* @return array
	*/
	function uu_decode(&$part)
	{
	// @TODO: messages may be huge, hadle body via file
	if (!isset($part->body))
	$part->body = $this->imap->get_message_part($this->uid, $part->mime_id, $part);

	$parts = array();
	// FIXME: line length is max.65?
	$uu_regexp = '/begin [0-7]{3,4} ([^\n]+)\n(([\x21-\x7E]{0,65}\n)+)`\nend/s';

	if (preg_match_all($uu_regexp, $part->body, $matches, PREG_SET_ORDER)) {
	// remove attachments bodies from the message body
	$part->body = preg_replace($uu_regexp, '', $part->body);
	// update message content-type
	$part->ctype_primary = 'multipart';
	$part->ctype_secondary = 'mixed';
	$part->mimetype = $part->ctype_primary . '/' . $part->ctype_secondary;

	// add attachments to the structure
	foreach ($matches as $pid => $att) {
	$uupart = new rcube_message_part;

	$uupart->filename = trim($att[1]);
	$uupart->encoding = 'stream';
	$uupart->body = convert_uudecode($att[2]);
	$uupart->size = strlen($uupart->body);
	$uupart->mime_id = 'uu.' . $part->mime_id . '.' . $pid;

	$ctype = rc_mime_content_type($uupart->body, $uupart->filename, 'application/octet-stream', true);
	$uupart->mimetype = $ctype;
	list($uupart->ctype_primary, $uupart->ctype_secondary) = explode('/', $ctype);

	$parts[] = $uupart;
	unset($matches[$pid]);
	}
	}

	return $parts;
	}


	/**
	* Interpret a format=flowed message body according to RFC 2646
	*
	* @param string $text Raw body formatted as flowed text
	* @return string Interpreted text with unwrapped lines and stuffed space removed
	*/
	public static function unfold_flowed($text)
	{
	$text = preg_split('/\r?\n/', $text);
	$last = -1;
	$q_level = 0;

	foreach ($text as $idx => $line) {
	if ($line[0] == '>' && preg_match('/^(>+\s*)/', $line, $regs)) {
	$q = strlen(str_replace(' ', '', $regs[0]));
	$line = substr($line, strlen($regs[0]));

	if ($q == $q_level && $line
	&& isset($text[$last])
	&& $text[$last][strlen($text[$last])-1] == ' '
	) {
	$text[$last] .= $line;
	unset($text[$idx]);
	}
	else {
	$last = $idx;
	}
	}
	else {
	$q = 0;
	if ($line == '-- ') {
	$last = $idx;
	}
	else {
	// remove space-stuffing
	$line = preg_replace('/^\s/', '', $line);

	if (isset($text[$last]) && $line
	&& $text[$last] != '-- '
	&& $text[$last][strlen($text[$last])-1] == ' '
	) {
	$text[$last] .= $line;
	unset($text[$idx]);
	}
	else {
	$text[$idx] = $line;
	$last = $idx;
	}
	}
	}
	$q_level = $q;
	}

	return implode("\r\n", $text);
	}


	/**
	* Wrap the given text to comply with RFC 2646
	*
	* @param string $text Text to wrap
	* @param int $length Length
	* @return string Wrapped text
	*/
	public static function format_flowed($text, $length = 72)
	{
	$text = preg_split('/\r?\n/', $text);

	foreach ($text as $idx => $line) {
	if ($line != '-- ') {
	if ($line[0] == '>' && preg_match('/^(>+)/', $line, $regs)) {
	$prefix = $regs[0];
	$level = strlen($prefix);
	$line = rtrim(substr($line, $level));
	$line = $prefix . rc_wordwrap($line, $length - $level - 2, " \r\n$prefix ");
	}
	else if ($line) {
	$line = rc_wordwrap(rtrim($line), $length - 2, " \r\n");
	// space-stuffing
	$line = preg_replace('/(^\|\r\n)(From\| \|>)/', '\\1 \\2', $line);
	}

	$text[$idx] = $line;
	}
	}

	return implode("\r\n", $text);
	}

	}

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