100 lines
3.6 KiB
PHP
100 lines
3.6 KiB
PHP
<?php
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/** This file is part of KCFinder project
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*
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* @desc HTTP cache helper class
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* @package KCFinder
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* @version 3.12
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* @author Pavel Tzonkov <sunhater@sunhater.com>
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* @copyright 2010-2014 KCFinder Project
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* @license http://opensource.org/licenses/GPL-3.0 GPLv3
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* @license http://opensource.org/licenses/LGPL-3.0 LGPLv3
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* @link http://kcfinder.sunhater.com
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*/
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namespace kcfinder;
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class httpCache {
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const DEFAULT_TYPE = "text/html";
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const DEFAULT_EXPIRE = 604800; // in seconds
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/** Cache a file. The $type parameter might define the MIME type of the file
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* or path to magic file to autodetect the MIME type. If you skip $type
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* parameter the method will try with the default magic file. Autodetection
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* of MIME type requires Fileinfo PHP extension used in file::getMimeType()
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* @param string $file
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* @param string $type
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* @param integer $expire
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* @param array $headers */
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static function file($file, $type=null, $expire=null, array $headers=null) {
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$mtime = @filemtime($file);
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if ($mtime !== false) self::checkMTime($mtime);
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if ($type === null) {
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$magic = ((substr($type, 0, 1) == "/") || preg_match('/^[a-z]\:/i', $type))
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? $type : null;
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$type = file::getMimeType($file, $magic);
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if (!$type) $type = null;
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}
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self::content(@file_get_contents($file), $mtime, $type, $expire, $headers, false);
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}
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/** Cache the given $content with $mtime modification time.
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* @param binary $content
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* @param integer $mtime
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* @param string $type
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* @param integer $expire
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* @param array $headers
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* @param bool $checkMTime */
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static function content($content, $mtime, $type=null, $expire=null, array $headers=null, $checkMTime=true) {
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if ($checkMTime) self::checkMTime($mtime);
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if ($type === null) $type = self::DEFAULT_TYPE;
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if ($expire === null) $expire = self::DEFAULT_EXPIRE;
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$size = strlen($content);
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$expires = gmdate("D, d M Y H:i:s", time() + $expire) . " GMT";
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header("Content-Type: $type");
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header("Expires: $expires");
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header("Cache-Control: max-age=$expire");
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header("Pragma: !invalid");
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header("Content-Length: $size");
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if ($headers !== null) foreach ($headers as $header) header($header);
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echo $content;
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}
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/** Check if given modification time is newer than client-side one. If not,
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* the method will tell the client to get the content from its own cache.
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* Afterwards the script process will be terminated. This feature requires
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* the PHP to be configured as Apache module.
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* @param integer $mtime
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* @param mixed $sendHeaders */
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static function checkMTime($mtime, $sendHeaders=null) {
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header("Last-Modified: " . gmdate("D, d M Y H:i:s", $mtime) . " GMT");
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$headers = function_exists("getallheaders")
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? getallheaders()
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: (function_exists("apache_request_headers")
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? apache_request_headers()
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: false);
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if (is_array($headers) && isset($headers['If-Modified-Since'])) {
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$client_mtime = explode(';', $headers['If-Modified-Since']);
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$client_mtime = @strtotime($client_mtime[0]);
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if ($client_mtime >= $mtime) {
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header('HTTP/1.1 304 Not Modified');
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if (is_array($sendHeaders) && count($sendHeaders))
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foreach ($sendHeaders as $header)
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header($header);
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elseif ($sendHeaders !== null)
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header($sendHeaders);
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die;
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}
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}
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}
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}
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?>
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