<?php

/**
 * download.php
 *
 * Copyright (c) 1999-2003 The SquirrelMail Project Team
 * Licensed under the GNU GPL. For full terms see the file COPYING.
 *
 * Handles attachment downloads to the users computer.
 * Also allows displaying of attachments when possible.
 *
 * $Id$
 */

/* Path for SquirrelMail required files. */
define('SM_PATH','../');

/* SquirrelMail required files. */
require_once(SM_PATH . 'include/validate.php');
require_once(SM_PATH . 'functions/imap.php');
require_once(SM_PATH . 'functions/mime.php');

header('Pragma: ');
header('Cache-Control: cache');

/* globals */

$key = $_COOKIE['key'];
$username = $_SESSION['username'];
$onetimepad = $_SESSION['onetimepad'];
$mailbox = $_GET['mailbox'];
$passed_id = (int) $_GET['passed_id'];
$ent_id = $_GET['ent_id'];
$messages = $_SESSION['messages'];

if (isset($_GET['absolute_dl'])) {
   $absolute_dl = $_GET['absolute_dl'];
}

/* end globals */
$mailbox = decodeHeader($mailbox);

global $uid_support;

$imapConnection = sqimap_login($username, $key, $imapServerAddress, $imapPort, 0);
$mbx_response =  sqimap_mailbox_select($imapConnection, $mailbox);

$message = &$messages[$mbx_response['UIDVALIDITY']]["$passed_id"];
if (!is_object($message)) {
    $message = sqimap_get_message($imapConnection,$passed_id, $mailbox);
}
$subject = $message->rfc822_header->subject;
if ($ent_id) {
    $message = &$message->getEntity($ent_id);
    $header = $message->header;
    
    if ($message->rfc822_header) {
       $subject = $message->rfc822_header->subject;
       $charset = $header->content_type->properties['charset'];
    } else {
       $header = $message->header;
       $charset = $header->getParameter('charset');
    }
    $type0 = $header->type0;
    $type1 = $header->type1;
    $encoding = strtolower($header->encoding);
} else {
    /* raw message */
    $type0 = 'message';
    $type1 = 'rfc822';
    $encoding = "US-ASCII";
}

/*
 * lets redefine message as this particular entity that we wish to display.
 * it should hold only the header for this entity.  We need to fetch the body
 * yet before we can display anything.
 */

if (isset($override_type0)) {
    $type0 = $override_type0;
}
if (isset($override_type1)) {
    $type1 = $override_type1;
}
$filename = '';
if (is_object($message->header->disposition)) {
    $filename = decodeHeader($header->disposition->getProperty('filename'));
    if (!$filename) {
	$filename = decodeHeader($header->disposition->getProperty('name'));
    }
    if (!$filename) {
        $filename = decodeHeader($header->getParameter('name'));
    }    
} else {
    $filename = decodeHeader($header->getParameter('name'));
}

if (strlen($filename) < 1) {
    if ($type1 == 'plain' && $type0 == 'text') {
        $suffix = 'txt';
	$filename = $subject . '.txt';
    } else if ($type1 == 'richtext' && $type0 == 'text') {
        $suffix = 'rtf';
	$filename = $subject . '.rtf';
    } else if ($type1 == 'postscript' && $type0 == 'application') {
        $suffix = 'ps';
	$filename = $subject . '.ps';
    } else if ($type1 == 'rfc822' && $type0 == 'message') {
        $suffix = 'eml';
	$filename = $subject . '.msg';
    } else {
        $suffix = $type1;
    }

    if (strlen($filename) < 1) {
       $filename = 'untitled'.strip_tags($ent_id).$suffix;
    } else {
       $filename = "$filename.$suffix";
    }
}

/*
 * Note:
 *    The following sections display the attachment in different
 *    ways depending on how they choose.  The first way will download
 *    under any circumstance.  This sets the Content-type to be
 *    applicatin/octet-stream, which should be interpreted by the
 *    browser as "download me".
 *      The second method (view) is used for images or other formats
 *    that should be able to be handled by the browser.  It will
 *    most likely display the attachment inline inside the browser.
 *      And finally, the third one will be used by default.  If it
 *    is displayable (text or html), it will load them up in a text
 *    viewer (built in to squirrelmail).  Otherwise, it sets the
 *    content-type as application/octet-stream
 */
if (isset($absolute_dl) && $absolute_dl) {
    DumpHeaders($type0, $type1, $filename, 1);
} else {
    DumpHeaders($type0, $type1, $filename, 0);
}
/* be aware that any warning caused by download.php will corrupt the
 * attachment in case of ERROR reporting = E_ALL and the output is the screen */
mime_print_body_lines ($imapConnection, $passed_id, $ent_id, $encoding);

/*
 * This function is verified to work with Netscape and the *very latest*
 * version of IE.  I don't know if it works with Opera, but it should now.
 */
function DumpHeaders($type0, $type1, $filename, $force) {
    global $_SERVER, $languages, $squirrelmail_language;
    $isIE = $isIE6 = 0;

    $HTTP_USER_AGENT = $_SERVER['HTTP_USER_AGENT'];

    if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
        strstr($HTTP_USER_AGENT, 'Opera') === false) {
        $isIE = 1;
    }

    if (strstr($HTTP_USER_AGENT, 'compatible; MSIE 6') !== false &&
        strstr($HTTP_USER_AGENT, 'Opera') === false) {
        $isIE6 = 1;
    }

    if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
        function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
        $filename = 
            $languages[$squirrelmail_language]['XTRA_CODE']('downloadfilename', $filename, $HTTP_USER_AGENT);
    } else {
       $filename = ereg_replace('[^-a-zA-Z0-9\.]', '_', $filename);
    }

    // A Pox on Microsoft and it's Office!
    if (!$force) {
        // Try to show in browser window
        header("Content-Disposition: inline; filename=\"$filename\"");
        header("Content-Type: $type0/$type1; name=\"$filename\"");
    } else {
        // Try to pop up the "save as" box
        // IE makes this hard.  It pops up 2 save boxes, or none.
        // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
        // But, accordint to Microsoft, it is "RFC compliant but doesn't
        // take into account some deviations that allowed within the
        // specification."  Doesn't that mean RFC non-compliant?
        // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
        //
        // The best thing you can do for IE is to upgrade to the latest
        // version
        if ($isIE && !$isIE6) {
            // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
            // Do not have quotes around filename, but that applied to
            // "attachment"... does it apply to inline too?
            //
            // This combination seems to work mostly.  IE 5.5 SP 1 has
            // known issues (see the Microsoft Knowledge Base)
            header("Content-Disposition: inline; filename=$filename");
            // This works for most types, but doesn't work with Word files
            header("Content-Type: application/download; name=\"$filename\"");

            // These are spares, just in case.  :-)
            //header("Content-Type: $type0/$type1; name=\"$filename\"");
            //header("Content-Type: application/x-msdownload; name=\"$filename\"");
            //header("Content-Type: application/octet-stream; name=\"$filename\"");
        } else {
            header("Content-Disposition: attachment; filename=\"$filename\"");
            // application/octet-stream forces download for Netscape
            header("Content-Type: application/octet-stream; name=\"$filename\"");
        }
    }
}
?>