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