119 lines
3 KiB
PHP
119 lines
3 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_NOT_FOUND = 404;
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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='.$cache_time.', must-revalidate');
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}
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else {
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self::setExpiresHeader(0);
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header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
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}
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}
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else {
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header('Cache-Control: cache');
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header('Pragma: cache');
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}
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}
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static public function setStatus($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 = $status . ' Not Found';
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break;
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}
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header($protocol.' '.$status);
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}
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static public function redirect($location) {
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self::setStatus(self::STATUS_TEMPORARY_REDIRECT);
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header('Location: '.$location);
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}
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static public function setExpiresHeader($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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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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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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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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static public function sendFile($filepath=null) {
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$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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