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Theodotos Andreou 2018-01-14 13:10:16 +00:00
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sites/all/modules/civicrm/CRM/Utils/Http.php Normal file
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<?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;
}
}