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