<?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: rcube_message.php 5261 2011-09-21 12:22:40Z alec $

*/


/**
 * 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 = $this->imap->get_headers($uid, NULL, true, true);

        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 ($this->structure = $this->imap->get_structure($uid, $this->headers->body_structure)) {
            $this->get_mime_numbers($this->structure);
            $this->parse_structure($this->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 alternative parts
        else if ($mimetype == 'multipart/alternative' && is_array($structure->parts)) {
            // 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);

            $this->parts[] = $p;
        }
        // message contains multiple parts
        else if (is_array($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);
    }

}