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<?php
/**
* @author Andreas Fischer <bantu@owncloud.com>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Lukas Reschke <lukas@owncloud.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin McCorkell <rmccorkell@karoshi.org.uk>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @copyright Copyright (c) 2015, ownCloud, Inc.
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
class OC_Response {
const STATUS_FOUND = 304;
const STATUS_NOT_MODIFIED = 304;
const STATUS_TEMPORARY_REDIRECT = 307;
const STATUS_BAD_REQUEST = 400;
const STATUS_NOT_FOUND = 404;
const STATUS_INTERNAL_SERVER_ERROR = 500;
const STATUS_SERVICE_UNAVAILABLE = 503;
/**
* Enable response caching by sending correct HTTP headers
* @param integer $cache_time time to cache the response
* >0 cache time in seconds
* 0 and <0 enable default browser caching
* null cache indefinitly
*/
static public function enableCaching($cache_time = null) {
if (is_numeric($cache_time)) {
header('Pragma: public');// enable caching in IE
if ($cache_time > 0) {
self::setExpiresHeader('PT'.$cache_time.'S');
header('Cache-Control: max-age='.$cache_time.', must-revalidate');
}
else {
self::setExpiresHeader(0);
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
}
}
else {
header('Cache-Control: cache');
header('Pragma: cache');
}
}
/**
* disable browser caching
* @see enableCaching with cache_time = 0
*/
static public function disableCaching() {
self::enableCaching(0);
}
/**
* Set response status
* @param int $status a HTTP status code, see also the STATUS constants
*/
static public function setStatus($status) {
$protocol = $_SERVER['SERVER_PROTOCOL'];
switch($status) {
case self::STATUS_NOT_MODIFIED:
$status = $status . ' Not Modified';
break;
case self::STATUS_TEMPORARY_REDIRECT:
if ($protocol == 'HTTP/1.1') {
$status = $status . ' Temporary Redirect';
break;
} else {
$status = self::STATUS_FOUND;
// fallthrough
}
case self::STATUS_FOUND;
$status = $status . ' Found';
break;
case self::STATUS_NOT_FOUND;
$status = $status . ' Not Found';
break;
case self::STATUS_INTERNAL_SERVER_ERROR;
$status = $status . ' Internal Server Error';
break;
case self::STATUS_SERVICE_UNAVAILABLE;
$status = $status . ' Service Unavailable';
break;
}
header($protocol.' '.$status);
}
/**
* Send redirect response
* @param string $location to redirect to
*/
static public function redirect($location) {
self::setStatus(self::STATUS_TEMPORARY_REDIRECT);
header('Location: '.$location);
}
/**
* Set reponse expire time
* @param string|DateTime $expires date-time when the response expires
* string for DateInterval from now
* DateTime object when to expire response
*/
static public function setExpiresHeader($expires) {
if (is_string($expires) && $expires[0] == 'P') {
$interval = $expires;
$expires = new DateTime('now');
$expires->add(new DateInterval($interval));
}
if ($expires instanceof DateTime) {
$expires->setTimezone(new DateTimeZone('GMT'));
$expires = $expires->format(DateTime::RFC2822);
}
header('Expires: '.$expires);
}
/**
* Checks and set ETag header, when the request matches sends a
* 'not modified' response
* @param string $etag token to use for modification check
*/
static public function setETagHeader($etag) {
if (empty($etag)) {
return;
}
$etag = '"'.$etag.'"';
if (isset($_SERVER['HTTP_IF_NONE_MATCH']) &&
trim($_SERVER['HTTP_IF_NONE_MATCH']) == $etag) {
self::setStatus(self::STATUS_NOT_MODIFIED);
exit;
}
header('ETag: '.$etag);
}
/**
* Checks and set Last-Modified header, when the request matches sends a
* 'not modified' response
* @param int|DateTime|string $lastModified time when the reponse was last modified
*/
static public function setLastModifiedHeader($lastModified) {
if (empty($lastModified)) {
return;
}
if (is_int($lastModified)) {
$lastModified = gmdate(DateTime::RFC2822, $lastModified);
}
if ($lastModified instanceof DateTime) {
$lastModified = $lastModified->format(DateTime::RFC2822);
}
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) &&
trim($_SERVER['HTTP_IF_MODIFIED_SINCE']) == $lastModified) {
self::setStatus(self::STATUS_NOT_MODIFIED);
exit;
}
header('Last-Modified: '.$lastModified);
}
/**
* Sets the content disposition header (with possible workarounds)
* @param string $filename file name
* @param string $type disposition type, either 'attachment' or 'inline'
*/
static public function setContentDispositionHeader( $filename, $type = 'attachment' ) {
if (\OC::$server->getRequest()->isUserAgent(
[
\OC\AppFramework\Http\Request::USER_AGENT_IE,
\OC\AppFramework\Http\Request::USER_AGENT_ANDROID_MOBILE_CHROME,
\OC\AppFramework\Http\Request::USER_AGENT_FREEBOX,
])) {
header( 'Content-Disposition: ' . rawurlencode($type) . '; filename="' . rawurlencode( $filename ) . '"' );
} else {
header( 'Content-Disposition: ' . rawurlencode($type) . '; filename*=UTF-8\'\'' . rawurlencode( $filename )
. '; filename="' . rawurlencode( $filename ) . '"' );
}
}
/**
* Sets the content length header (with possible workarounds)
* @param string|int|float $length Length to be sent
*/
static public function setContentLengthHeader($length) {
if (PHP_INT_SIZE === 4) {
if ($length > PHP_INT_MAX && stripos(PHP_SAPI, 'apache') === 0) {
// Apache PHP SAPI casts Content-Length headers to PHP integers.
// This enforces a limit of PHP_INT_MAX (2147483647 on 32-bit
// platforms). So, if the length is greater than PHP_INT_MAX,
// we just do not send a Content-Length header to prevent
// bodies from being received incompletely.
return;
}
// Convert signed integer or float to unsigned base-10 string.
$lfh = new \OC\LargeFileHelper;
$length = $lfh->formatUnsignedInteger($length);
}
header('Content-Length: '.$length);
}
/**
* Send file as response, checking and setting caching headers
* @param string $filepath of file to send
* @deprecated 8.1.0 - Use \OCP\AppFramework\Http\StreamResponse or another AppFramework controller instead
*/
static public function sendFile($filepath) {
$fp = fopen($filepath, 'rb');
if ($fp) {
self::setLastModifiedHeader(filemtime($filepath));
self::setETagHeader(md5_file($filepath));
self::setContentLengthHeader(filesize($filepath));
fpassthru($fp);
}
else {
self::setStatus(self::STATUS_NOT_FOUND);
}
}
/**
* This function adds some security related headers to all requests served via base.php
* The implementation of this function has to happen here to ensure that all third-party
* components (e.g. SabreDAV) also benefit from this headers.
*/
public static function addSecurityHeaders() {
/**
* FIXME: Content Security Policy for legacy ownCloud components. This
* can be removed once \OCP\AppFramework\Http\Response from the AppFramework
* is used everywhere.
* @see \OCP\AppFramework\Http\Response::getHeaders
*/
$policy = 'default-src \'self\'; '
. 'script-src \'self\' \'unsafe-eval\'; '
. 'style-src \'self\' \'unsafe-inline\'; '
. 'frame-src *; '
. 'img-src * data: blob:; '
. 'font-src \'self\' data:; '
. 'media-src *; '
. 'connect-src *';
header('Content-Security-Policy:' . $policy);
// Send fallback headers for installations that don't have the possibility to send
// custom headers on the webserver side
if(getenv('modHeadersAvailable') !== 'true') {
header('X-XSS-Protection: 1; mode=block'); // Enforce browser based XSS filters
header('X-Content-Type-Options: nosniff'); // Disable sniffing the content type for IE
header('X-Frame-Options: Sameorigin'); // Disallow iFraming from other domains
header('X-Robots-Tag: none'); // https://developers.google.com/webmasters/control-crawl-index/docs/robots_meta_tag
}
}
}
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