| 1 | <?php
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| 2 |
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| 3 | /** This file is part of KCFinder project
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| 4 | *
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| 5 | * @desc HTTP cache helper class
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| 6 | * @package KCFinder
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| 7 | * @version 2.51
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| 8 | * @author Pavel Tzonkov <pavelc@users.sourceforge.net>
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| 9 | * @copyright 2010, 2011 KCFinder Project
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| 10 | * @license http://www.opensource.org/licenses/gpl-2.0.php GPLv2
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| 11 | * @license http://www.opensource.org/licenses/lgpl-2.1.php LGPLv2
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| 12 | * @link http://kcfinder.sunhater.com
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| 13 | */
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| 14 |
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| 15 | class httpCache {
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| 16 | const DEFAULT_TYPE = "text/html";
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| 17 | const DEFAULT_EXPIRE = 604800; // in seconds
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| 18 |
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| 19 | /** Cache a file. The $type parameter might define the MIME type of the file
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| 20 | * or path to magic file to autodetect the MIME type. If you skip $type
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| 21 | * parameter the method will try with the default magic file. Autodetection
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| 22 | * of MIME type requires Fileinfo PHP extension used in file::getMimeType()
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| 23 | * @param string $file
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| 24 | * @param string $type
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| 25 | * @param integer $expire
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| 26 | * @param array $headers */
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| 27 |
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| 28 | static function file($file, $type=null, $expire=null, array $headers=null) {
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| 29 | $mtime = @filemtime($file);
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| 30 | if ($mtime !== false) self::checkMTime($mtime);
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| 31 |
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| 32 | if ($type === null) {
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| 33 | $magic = ((substr($type, 0, 1) == "/") || preg_match('/^[a-z]\:/i', $type))
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| 34 | ? $type : null;
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| 35 | $type = file::getMimeType($file, $magic);
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| 36 | if (!$type) $type = null;
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| 37 | }
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| 38 |
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| 39 | self::content(@file_get_contents($file), $mtime, $type, $expire, $headers, false);
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| 40 | }
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| 41 |
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| 42 | /** Cache the given $content with $mtime modification time.
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| 43 | * @param binary $content
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| 44 | * @param integer $mtime
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| 45 | * @param string $type
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| 46 | * @param integer $expire
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| 47 | * @param array $headers
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| 48 | * @param bool $checkMTime */
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| 49 |
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| 50 | static function content($content, $mtime, $type=null, $expire=null, array $headers=null, $checkMTime=true) {
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| 51 | if ($checkMTime) self::checkMTime($mtime);
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| 52 | if ($type === null) $type = self::DEFAULT_TYPE;
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| 53 | if ($expire === null) $expire = self::DEFAULT_EXPIRE;
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| 54 | $size = strlen($content);
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| 55 | $expires = gmdate("D, d M Y H:i:s", time() + $expire) . " GMT";
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| 56 | header("Content-Type: $type");
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| 57 | header("Expires: $expires");
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| 58 | header("Cache-Control: max-age=$expire");
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| 59 | header("Pragma: !invalid");
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| 60 | header("Content-Length: $size");
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| 61 | if ($headers !== null) foreach ($headers as $header) header($header);
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| 62 | echo $content;
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| 63 | }
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| 64 |
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| 65 | /** Check if given modification time is newer than client-side one. If not,
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| 66 | * the method will tell the client to get the content from its own cache.
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| 67 | * Afterwards the script process will be terminated. This feature requires
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| 68 | * the PHP to be configured as Apache module.
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| 69 | * @param integer $mtime */
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| 70 |
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| 71 | static function checkMTime($mtime, $sendHeaders=null) {
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| 72 | header("Last-Modified: " . gmdate("D, d M Y H:i:s", $mtime) . " GMT");
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| 73 |
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| 74 | $headers = function_exists("getallheaders")
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| 75 | ? getallheaders()
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| 76 | : (function_exists("apache_request_headers")
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| 77 | ? apache_request_headers()
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| 78 | : false);
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| 79 |
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| 80 | if (is_array($headers) && isset($headers['If-Modified-Since'])) {
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| 81 | $client_mtime = explode(';', $headers['If-Modified-Since']);
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| 82 | $client_mtime = @strtotime($client_mtime[0]);
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| 83 | if ($client_mtime >= $mtime) {
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| 84 | header('HTTP/1.1 304 Not Modified');
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| 85 | if (is_array($sendHeaders) && count($sendHeaders))
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| 86 | foreach ($sendHeaders as $header)
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| 87 | header($header);
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| 88 | elseif ($sendHeaders !== null)
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| 89 | header($sendHeaders);
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| 90 |
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| 91 |
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| 92 | die;
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| 93 | }
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| 94 | }
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| 95 | }
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| 96 | }
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| 97 |
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| 98 | ?>
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