get.inc
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get.inc
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	<?php

	/*
	+-----------------------------------------------------------------------+
	\| program/steps/mail/get.inc \|
	\| \|
	\| This file is part of the Roundcube Webmail client \|
	\| Copyright (C) 2005-2011, The Roundcube Dev Team \|
	\| \|
	\| Licensed under the GNU General Public License version 3 or \|
	\| any later version with exceptions for skins & plugins. \|
	\| See the README file for a full license statement. \|
	\| \|
	\| PURPOSE: \|
	\| Delivering a specific part of a mail message \|
	\| \|
	+-----------------------------------------------------------------------+
	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	+-----------------------------------------------------------------------+
	*/


	// show loading page
	if (!empty($_GET['_preload'])) {
	$url = preg_replace('/([&?]+)_preload=/', '\\1_embed=', $_SERVER['REQUEST_URI']);
	$message = rcube_label('loadingdata');

	header('Content-Type: text/html; charset=' . RCMAIL_CHARSET);
	print "<html>\n<head>\n"
	. '<meta http-equiv="refresh" content="0; url='.Q($url).'">' . "\n"
	. '<meta http-equiv="content-type" content="text/html; charset='.RCMAIL_CHARSET.'">' . "\n"
	. "</head>\n<body>\n$message\n</body>\n</html>";
	exit;
	}

	ob_end_clean();

	// similar code as in program/steps/mail/show.inc
	if (!empty($_GET['_uid'])) {
	$RCMAIL->config->set('prefer_html', true);
	$MESSAGE = new rcube_message(get_input_value('_uid', RCUBE_INPUT_GET));
	}

	// check connection status
	check_storage_status();

	// show part page
	if (!empty($_GET['_frame'])) {
	if (($part_id = get_input_value('_part', RCUBE_INPUT_GPC)) && ($part = $MESSAGE->mime_parts[$part_id])) {
	$filename = $part->filename;
	if (empty($filename) && $part->mimetype == 'text/html') {
	$filename = rcube_label('htmlmessage');
	}
	if (!empty($filename)) {
	$OUTPUT->set_pagetitle($filename);
	}
	}

	$OUTPUT->send('messagepart');
	exit;
	}

	else if (strlen($pid = get_input_value('_part', RCUBE_INPUT_GET))) {

	if ($part = $MESSAGE->mime_parts[$pid]) {
	$ctype_primary = strtolower($part->ctype_primary);
	$ctype_secondary = strtolower($part->ctype_secondary);
	$mimetype = sprintf('%s/%s', $ctype_primary, $ctype_secondary);

	// allow post-processing of the message body
	$plugin = $RCMAIL->plugins->exec_hook('message_part_get',
	array('uid' => $MESSAGE->uid, 'id' => $part->mime_id, 'mimetype' => $mimetype, 'part' => $part, 'download' => !empty($_GET['_download'])));

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

	// overwrite modified vars from plugin
	$mimetype = $plugin['mimetype'];

	// TIFF to JPEG conversion, if needed
	$tiff_support = !empty($_SESSION['browser_caps']) && !empty($_SESSION['browser_caps']['tif']);
	if (!empty($_REQUEST['_embed']) && !$tiff_support
	&& $RCMAIL->config->get('im_convert_path')
	&& rcmail_part_image_type($part) == 'image/tiff'
	) {
	$tiff2jpeg = true;
	$mimetype = 'image/jpeg';
	}

	list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);
	if ($plugin['body'])
	$part->body = $plugin['body'];

	$browser = $RCMAIL->output->browser;

	// send download headers
	if ($plugin['download']) {
	header("Content-Type: application/octet-stream");
	if ($browser->ie)
	header("Content-Type: application/force-download");
	}
	else if ($ctype_primary == 'text') {
	header("Content-Type: text/$ctype_secondary; charset=" . ($part->charset ? $part->charset : RCMAIL_CHARSET));
	}
	else {
	$mimetype = rcmail_fix_mimetype($mimetype);
	header("Content-Type: $mimetype");
	header("Content-Transfer-Encoding: binary");
	}

	// deliver part content
	if ($ctype_primary == 'text' && $ctype_secondary == 'html' && empty($plugin['download'])) {
	// Check if we have enough memory to handle the message in it
	// #1487424: we need up to 10x more memory than the body
	if (!rcmail_mem_check($part->size * 10)) {
	$out = '<body>' . rcube_label('messagetoobig'). ' '
	. html::a('?_task=mail&_action=get&_download=1&_uid='.$MESSAGE->uid.'&_part='.$part->mime_id
	.'&_mbox='. urlencode($RCMAIL->storage->get_folder()), rcube_label('download')) . '</body></html>';
	}
	else {
	// get part body if not available
	if (!$part->body)
	$part->body = $MESSAGE->get_part_content($part->mime_id);

	$out = rcmail_print_body($part, array('safe' => $MESSAGE->is_safe, 'inline_html' => false));
	}

	// check connection status
	if ($part->size && empty($part->body)) {
	check_storage_status();
	}

	$OUTPUT = new rcube_output_html();
	$OUTPUT->write($out);
	}
	else {
	// don't kill the connection if download takes more than 30 sec.
	@set_time_limit(0);

	if ($part->filename) {
	$filename = $part->filename;
	}
	else if ($part->mimetype == 'text/html') {
	$filename = rcube_label('htmlmessage');
	}
	else {
	$ext = '.' . ($mimetype == 'text/plain' ? 'txt' : $ctype_secondary);
	$filename = ($MESSAGE->subject ? $MESSAGE->subject : 'roundcube') . $ext;
	}

	$filename = preg_replace('[\r\n]', '', $filename);

	if ($browser->ie && $browser->ver < 7)
	$filename = rawurlencode(abbreviate_string($filename, 55));
	else if ($browser->ie)
	$filename = rawurlencode($filename);
	else
	$filename = addcslashes($filename, '"');

	$disposition = !empty($plugin['download']) ? 'attachment' : 'inline';

	header("Content-Disposition: $disposition; filename=\"$filename\"");

	// handle tiff to jpeg conversion
	if (!empty($tiff2jpeg)) {
	$temp_dir = unslashify($RCMAIL->config->get('temp_dir'));
	$file_path = tempnam($temp_dir, 'rcmAttmnt');

	// write content to temp file
	if ($part->body) {
	$saved = file_put_contents($file_path, $part->body);
	}
	else if ($part->size) {
	$fd = fopen($file_path, 'w');
	$saved = $RCMAIL->storage->get_message_part($MESSAGE->uid, $part->mime_id, $part, false, $fd);
	fclose($fd);
	}

	// convert image to jpeg and send it to the browser
	if ($saved) {
	$image = new rcube_image($file_path);
	if ($image->convert(rcube_image::TYPE_JPG, $file_path)) {
	header("Content-Length: " . filesize($file_path));
	readfile($file_path);
	}
	unlink($file_path);
	}
	}
	// do content filtering to avoid XSS through fake images
	else if (!empty($_REQUEST['_embed']) && $browser->ie && $browser->ver <= 8) {
	if ($part->body) {
	echo preg_match('/<(script\|iframe\|object)/i', $part->body) ? '' : $part->body;
	$sent = true;
	}
	else if ($part->size) {
	$stdout = fopen('php://output', 'w');
	stream_filter_register('rcube_content', 'rcube_content_filter') or die('Failed to register content filter');
	stream_filter_append($stdout, 'rcube_content');
	$sent = $RCMAIL->storage->get_message_part($MESSAGE->uid, $part->mime_id, $part, false, $stdout);
	}
	}
	// send part as-it-is
	else {
	if ($part->body) {
	header("Content-Length: " . sizeof($part->body));
	echo $part->body;
	$sent = true;
	}
	else if ($part->size) {
	if ($size = (int)$part->d_parameters['size']) {
	header("Content-Length: $size");
	}

	$sent = $RCMAIL->storage->get_message_part($MESSAGE->uid, $part->mime_id, $part, true);
	}
	}

	// check connection status
	if ($part->size && !$sent) {
	check_storage_status();
	}
	}

	exit;
	}
	}

	// print message
	else {
	// send correct headers for content type
	header("Content-Type: text/html");

	$cont = "<html>\n<head><title></title>\n</head>\n<body>";
	$cont .= rcmail_message_body(array());
	$cont .= "\n</body>\n</html>";

	$OUTPUT = new rcube_html_page();
	$OUTPUT->write($cont);

	exit;
	}


	// if we arrive here, the requested part was not found
	header('HTTP/1.1 404 Not Found');
	exit;


	function check_storage_status()
	{
	$error = rcmail::get_instance()->storage->get_error_code();

	// Check if we have a connection error
	if ($error == rcube_imap_generic::ERROR_BAD) {
	ob_end_clean();

	// Get action is often executed simultanously.
	// Some servers have MAXPERIP or other limits.
	// To workaround this we'll wait for some time
	// and try again (once).
	// Note: Random sleep interval is used to minimize concurency
	// in getting message parts

	if (!isset($_GET['_redirected'])) {
	usleep(rand(10,30)*100000); // 1-3 sec.
	header('Location: ' . $_SERVER['REQUEST_URI'] . '&_redirected=1');
	}
	else {
	raise_error(array(
	'code' => 500, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => 'Unable to get/display message part. IMAP connection error'),
	true, true);
	}

	// Don't kill session, just quit (#1486995)
	exit;
	}
	}

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