81 lines
2.8 KiB
PHP
81 lines
2.8 KiB
PHP
<?php
|
|
/*
|
|
+--------------------------------------------------------------------+
|
|
| CiviCRM version 4.7 |
|
|
+--------------------------------------------------------------------+
|
|
| Copyright CiviCRM LLC (c) 2004-2017 |
|
|
+--------------------------------------------------------------------+
|
|
| This file is a part of CiviCRM. |
|
|
| |
|
|
| CiviCRM is free software; you can copy, modify, and distribute it |
|
|
| under the terms of the GNU Affero General Public License |
|
|
| Version 3, 19 November 2007 and the CiviCRM Licensing Exception. |
|
|
| |
|
|
| CiviCRM is distributed in the hope that it will be useful, but |
|
|
| WITHOUT ANY WARRANTY; without even the implied warranty of |
|
|
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
|
|
| See the GNU Affero General Public License for more details. |
|
|
| |
|
|
| You should have received a copy of the GNU Affero General Public |
|
|
| License and the CiviCRM Licensing Exception along |
|
|
| with this program; if not, contact CiviCRM LLC |
|
|
| at info[AT]civicrm[DOT]org. If you have questions about the |
|
|
| GNU Affero General Public License or the licensing of CiviCRM, |
|
|
| see the CiviCRM license FAQ at http://civicrm.org/licensing |
|
|
+--------------------------------------------------------------------+
|
|
*/
|
|
|
|
/**
|
|
*
|
|
* @package CiviCRM_Hook
|
|
* @copyright CiviCRM LLC (c) 2004-2017
|
|
*/
|
|
class CRM_Utils_Http {
|
|
|
|
/**
|
|
* Parse the expiration time from a series of HTTP headers.
|
|
*
|
|
* @param array $headers
|
|
* @return int|NULL
|
|
* Expiration tme as seconds since epoch, or NULL if not cacheable.
|
|
*/
|
|
public static function parseExpiration($headers) {
|
|
$headers = CRM_Utils_Array::rekey($headers, function ($k, $v) {
|
|
return strtolower($k);
|
|
});
|
|
|
|
if (!empty($headers['cache-control'])) {
|
|
$cc = self::parseCacheControl($headers['cache-control']);
|
|
if ($cc['max-age'] && is_numeric($cc['max-age'])) {
|
|
return CRM_Utils_Time::getTimeRaw() + $cc['max-age'];
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* @param string $value
|
|
* Ex: "max-age=86400, public".
|
|
* @return array
|
|
* Ex: Array("max-age"=>86400, "public"=>1).
|
|
*/
|
|
public static function parseCacheControl($value) {
|
|
$result = array();
|
|
|
|
$parts = preg_split('/, */', $value);
|
|
foreach ($parts as $part) {
|
|
if (strpos($part, '=') !== FALSE) {
|
|
list ($key, $value) = explode('=', $part, 2);
|
|
$result[$key] = $value;
|
|
}
|
|
else {
|
|
$result[$part] = TRUE;
|
|
}
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
}
|