added extra check for save internal link extensions. (for use with

[squirrelmail.git] / functions / mime.php

<?php

/**
 * mime.php
 *
 * Copyright (c) 1999-2002 The SquirrelMail Project Team
 * Licensed under the GNU GPL. For full terms see the file COPYING.
 *
 * This contains the functions necessary to detect and decode MIME
 * messages.
 *
 * $Id$
 */

require_once('../functions/imap.php');
require_once('../functions/attachment_common.php');

/* --------------------------------------------------------------------------------- */
/* MIME DECODING                                                                     */
/* --------------------------------------------------------------------------------- */

/* This function gets the structure of a message and stores it in the "message" class.
 * It will return this object for use with all relevant header information and
 * fully parsed into the standard "message" object format.
 */

function mime_structure ($bodystructure, $flags=array()) {

    // isolate the body structure and remove beginning and end parenthesis
    $read = trim(substr ($bodystructure, strpos(strtolower($bodystructure), 'bodystructure') + 13));
    $msg = &new message();
    $read = trim(substr ($read, 0, -1));
    $res = $msg->parseStructure($read);
    $msg = $res[0];
    $msg->setEnt('0');
    if (count($flags)) {
        foreach ($flags as $flag) {
            $char = strtoupper($flag{1});
            switch ($char) {
            case 'S':
                if (strtolower($flag) == '\\seen') {
                    $msg->is_seen = true;
                }
                break;
            case 'A':
                if (strtolower($flag) == '\\answered') {
                    $msg->is_answered = true;
                }
                break;
            case 'D':
                if (strtolower($flag) == '\\deleted') {
                    $msg->is_deleted = true;
                }
                break;
            case 'F':
                if (strtolower($flag) == '\\flagged') {
                    $msg->is_flagged = true;
                }
                break;
            case 'M':
                if (strtolower($flag) == '$mdnsent') {
                    $msg->is_mdnsent = true;
                }
                break;
            default:
                break;
            }
        }
    }
    //    listEntities($msg);
    return( $msg );
}

/* this starts the parsing of a particular structure.  It is called recursively,
 * so it can be passed different structures.  It returns an object of type
 * $message.
 * First, it checks to see if it is a multipart message.  If it is, then it
 * handles that as it sees is necessary.  If it is just a regular entity,
 * then it parses it and adds the necessary header information (by calling out
 * to mime_get_elements()
 */

function mime_fetch_body($imap_stream, $id, $ent_id) {
    global $uid_support; 
    /*
     * do a bit of error correction.  If we couldn't find the entity id, just guess
     * that it is the first one.  That is usually the case anyway.
     */
    if (!$ent_id) {
        $ent_id = 1;
    }
    $cmd = "FETCH $id BODY[$ent_id]";
    
    $data = sqimap_run_command ($imap_stream, $cmd, true, $response, $message, $uid_support);
    do {
        $topline = trim(array_shift( $data ));
    } while( $topline && $topline[0] == '*' && !preg_match( '/\* [0-9]+ FETCH.*/i', $topline )) ;

    $wholemessage = implode('', $data);
    if (ereg('\\{([^\\}]*)\\}', $topline, $regs)) {

        $ret = substr( $wholemessage, 0, $regs[1] );
        /*
            There is some information in the content info header that could be important
            in order to parse html messages. Let's get them here.
        */
        if ( $ret{0} == '<' ) {
            $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message, $uid_support);
        }
    } else if (ereg('"([^"]*)"', $topline, $regs)) {
        $ret = $regs[1];
    } else {
        global $where, $what, $mailbox, $passed_id, $startMessage;
        $par = 'mailbox=' . urlencode($mailbox) . "&amp;passed_id=$passed_id";
        if (isset($where) && isset($what)) {
            $par .= '&amp;where='. urlencode($where) . "&amp;what=" . urlencode($what);
        } else {
            $par .= "&amp;startMessage=$startMessage&amp;show_more=0";
        }
        $par .= '&amp;response=' . urlencode($response) .
                '&amp;message=' . urlencode($message).
                '&amp;topline=' . urlencode($topline);

        echo   '<tt><br>' .
               '<table width="80%"><tr>' .
               '<tr><td colspan=2>' .
               _("Body retrieval error. The reason for this is most probably that the message is malformed. Please help us making future versions better by submitting this message to the developers knowledgebase!") .
               " <A HREF=\"../src/retrievalerror.php?$par\"><br>" .
               _("Submit message") . '</A><BR>&nbsp;' .
               '</td></tr>' .
               '<td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
               '<td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
               '<td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
               '<td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
               "</table><BR></tt></font><hr>";

        $data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message, $uid_support);
        array_shift($data);
        $wholemessage = implode('', $data);

        $ret = $wholemessage;
    }
    return( $ret );
}

function mime_print_body_lines ($imap_stream, $id, $ent_id, $encoding) {
    global $uid_support;
    // do a bit of error correction.  If we couldn't find the entity id, just guess
    // that it is the first one.  That is usually the case anyway.
    if (!$ent_id) {
        $ent_id = 1;
    }
    $sid = sqimap_session_id($uid_support);
    // Don't kill the connection if the browser is over a dialup
    // and it would take over 30 seconds to download it.