223 lines
6.5 KiB
PHP
223 lines
6.5 KiB
PHP
<?php
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/**
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* Copyright (c) 2011 Bart Visscher bartv@thisnet.nl
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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*/
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class OC_Response {
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const STATUS_FOUND = 304;
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const STATUS_NOT_MODIFIED = 304;
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const STATUS_TEMPORARY_REDIRECT = 307;
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const STATUS_BAD_REQUEST = 400;
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const STATUS_NOT_FOUND = 404;
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const STATUS_INTERNAL_SERVER_ERROR = 500;
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const STATUS_SERVICE_UNAVAILABLE = 503;
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/**
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* Enable response caching by sending correct HTTP headers
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* @param integer $cache_time time to cache the response
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* >0 cache time in seconds
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* 0 and <0 enable default browser caching
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* null cache indefinitly
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*/
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static public function enableCaching($cache_time = null) {
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if (is_numeric($cache_time)) {
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header('Pragma: public');// enable caching in IE
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if ($cache_time > 0) {
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self::setExpiresHeader('PT'.$cache_time.'S');
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header('Cache-Control: max-age='.$cache_time.', must-revalidate');
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}
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else {
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self::setExpiresHeader(0);
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header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
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}
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}
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else {
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header('Cache-Control: cache');
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header('Pragma: cache');
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}
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}
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/**
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* disable browser caching
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* @see enableCaching with cache_time = 0
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*/
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static public function disableCaching() {
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self::enableCaching(0);
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}
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/**
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* Set response status
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* @param int $status a HTTP status code, see also the STATUS constants
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*/
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static public function setStatus($status) {
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$protocol = $_SERVER['SERVER_PROTOCOL'];
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switch($status) {
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case self::STATUS_NOT_MODIFIED:
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$status = $status . ' Not Modified';
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break;
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case self::STATUS_TEMPORARY_REDIRECT:
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if ($protocol == 'HTTP/1.1') {
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$status = $status . ' Temporary Redirect';
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break;
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} else {
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$status = self::STATUS_FOUND;
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// fallthrough
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}
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case self::STATUS_FOUND;
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$status = $status . ' Found';
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break;
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case self::STATUS_NOT_FOUND;
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$status = $status . ' Not Found';
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break;
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case self::STATUS_INTERNAL_SERVER_ERROR;
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$status = $status . ' Internal Server Error';
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break;
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case self::STATUS_SERVICE_UNAVAILABLE;
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$status = $status . ' Service Unavailable';
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break;
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}
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header($protocol.' '.$status);
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}
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/**
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* Send redirect response
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* @param string $location to redirect to
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*/
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static public function redirect($location) {
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self::setStatus(self::STATUS_TEMPORARY_REDIRECT);
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header('Location: '.$location);
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}
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/**
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* Set reponse expire time
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* @param string|DateTime $expires date-time when the response expires
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* string for DateInterval from now
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* DateTime object when to expire response
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*/
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static public function setExpiresHeader($expires) {
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if (is_string($expires) && $expires[0] == 'P') {
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$interval = $expires;
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$expires = new DateTime('now');
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$expires->add(new DateInterval($interval));
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}
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if ($expires instanceof DateTime) {
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$expires->setTimezone(new DateTimeZone('GMT'));
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$expires = $expires->format(DateTime::RFC2822);
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}
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header('Expires: '.$expires);
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}
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/**
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* Checks and set ETag header, when the request matches sends a
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* 'not modified' response
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* @param string $etag token to use for modification check
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*/
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static public function setETagHeader($etag) {
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if (empty($etag)) {
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return;
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}
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$etag = '"'.$etag.'"';
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if (isset($_SERVER['HTTP_IF_NONE_MATCH']) &&
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trim($_SERVER['HTTP_IF_NONE_MATCH']) == $etag) {
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self::setStatus(self::STATUS_NOT_MODIFIED);
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exit;
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}
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header('ETag: '.$etag);
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}
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/**
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* Checks and set Last-Modified header, when the request matches sends a
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* 'not modified' response
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* @param int|DateTime|string $lastModified time when the reponse was last modified
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*/
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static public function setLastModifiedHeader($lastModified) {
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if (empty($lastModified)) {
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return;
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}
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if (is_int($lastModified)) {
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$lastModified = gmdate(DateTime::RFC2822, $lastModified);
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}
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if ($lastModified instanceof DateTime) {
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$lastModified = $lastModified->format(DateTime::RFC2822);
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}
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if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) &&
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trim($_SERVER['HTTP_IF_MODIFIED_SINCE']) == $lastModified) {
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self::setStatus(self::STATUS_NOT_MODIFIED);
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exit;
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}
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header('Last-Modified: '.$lastModified);
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}
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/**
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* Sets the content disposition header (with possible workarounds)
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* @param string $filename file name
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* @param string $type disposition type, either 'attachment' or 'inline'
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*/
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static public function setContentDispositionHeader( $filename, $type = 'attachment' ) {
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if (OC_Request::isUserAgent(array(
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OC_Request::USER_AGENT_IE,
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OC_Request::USER_AGENT_ANDROID_MOBILE_CHROME,
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OC_Request::USER_AGENT_FREEBOX
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))) {
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header( 'Content-Disposition: ' . rawurlencode($type) . '; filename="' . rawurlencode( $filename ) . '"' );
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} else {
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header( 'Content-Disposition: ' . rawurlencode($type) . '; filename*=UTF-8\'\'' . rawurlencode( $filename )
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. '; filename="' . rawurlencode( $filename ) . '"' );
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}
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}
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/**
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* Send file as response, checking and setting caching headers
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* @param string $filepath of file to send
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*/
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static public function sendFile($filepath) {
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$fp = fopen($filepath, 'rb');
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if ($fp) {
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self::setLastModifiedHeader(filemtime($filepath));
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self::setETagHeader(md5_file($filepath));
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header('Content-Length: '.filesize($filepath));
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fpassthru($fp);
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}
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else {
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self::setStatus(self::STATUS_NOT_FOUND);
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}
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}
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/*
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* This function adds some security related headers to all requests served via base.php
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* The implementation of this function has to happen here to ensure that all third-party
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* components (e.g. SabreDAV) also benefit from this headers.
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*/
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public static function addSecurityHeaders() {
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header('X-XSS-Protection: 1; mode=block'); // Enforce browser based XSS filters
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header('X-Content-Type-Options: nosniff'); // Disable sniffing the content type for IE
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// iFrame Restriction Policy
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$xFramePolicy = OC_Config::getValue('xframe_restriction', true);
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if ($xFramePolicy) {
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header('X-Frame-Options: Sameorigin'); // Disallow iFraming from other domains
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}
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// Content Security Policy
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// If you change the standard policy, please also change it in config.sample.php
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$policy = OC_Config::getValue('custom_csp_policy',
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'default-src \'self\'; '
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. 'script-src \'self\' \'unsafe-eval\'; '
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. 'style-src \'self\' \'unsafe-inline\'; '
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. 'frame-src *; '
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. 'img-src *; '
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. 'font-src \'self\' data:; '
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. 'media-src *; '
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. 'connect-src *');
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header('Content-Security-Policy:' . $policy);
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// https://developers.google.com/webmasters/control-crawl-index/docs/robots_meta_tag
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header('X-Robots-Tag: none');
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}
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}
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