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5063e355 | 1 | <?php |
50bfb460 SB |
2 | /* |
3 | +--------------------------------------------------------------------+ | |
fee14197 | 4 | | CiviCRM version 5 | |
50bfb460 | 5 | +--------------------------------------------------------------------+ |
6b83d5bd | 6 | | Copyright CiviCRM LLC (c) 2004-2019 | |
50bfb460 SB |
7 | +--------------------------------------------------------------------+ |
8 | | This file is a part of CiviCRM. | | |
9 | | | | |
10 | | CiviCRM is free software; you can copy, modify, and distribute it | | |
11 | | under the terms of the GNU Affero General Public License | | |
12 | | Version 3, 19 November 2007 and the CiviCRM Licensing Exception. | | |
13 | | | | |
14 | | CiviCRM is distributed in the hope that it will be useful, but | | |
15 | | WITHOUT ANY WARRANTY; without even the implied warranty of | | |
16 | | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | | |
17 | | See the GNU Affero General Public License for more details. | | |
18 | | | | |
19 | | You should have received a copy of the GNU Affero General Public | | |
20 | | License and the CiviCRM Licensing Exception along | | |
21 | | with this program; if not, contact CiviCRM LLC | | |
22 | | at info[AT]civicrm[DOT]org. If you have questions about the | | |
23 | | GNU Affero General Public License or the licensing of CiviCRM, | | |
24 | | see the CiviCRM license FAQ at http://civicrm.org/licensing | | |
25 | +--------------------------------------------------------------------+ | |
26 | */ | |
5063e355 | 27 | |
50bfb460 SB |
28 | /** |
29 | * | |
30 | * @package CiviCRM_Hook | |
6b83d5bd | 31 | * @copyright CiviCRM LLC (c) 2004-2019 |
50bfb460 | 32 | */ |
5063e355 TO |
33 | class CRM_Utils_Http { |
34 | ||
35 | /** | |
36 | * Parse the expiration time from a series of HTTP headers. | |
37 | * | |
38 | * @param array $headers | |
e97c66ff | 39 | * @return int|null |
5063e355 TO |
40 | * Expiration tme as seconds since epoch, or NULL if not cacheable. |
41 | */ | |
42 | public static function parseExpiration($headers) { | |
43 | $headers = CRM_Utils_Array::rekey($headers, function ($k, $v) { | |
44 | return strtolower($k); | |
45 | }); | |
46 | ||
47 | if (!empty($headers['cache-control'])) { | |
48 | $cc = self::parseCacheControl($headers['cache-control']); | |
49 | if ($cc['max-age'] && is_numeric($cc['max-age'])) { | |
50 | return CRM_Utils_Time::getTimeRaw() + $cc['max-age']; | |
51 | } | |
52 | } | |
53 | ||
54 | return NULL; | |
55 | } | |
56 | ||
57 | /** | |
58 | * @param string $value | |
59 | * Ex: "max-age=86400, public". | |
60 | * @return array | |
61 | * Ex: Array("max-age"=>86400, "public"=>1). | |
62 | */ | |
63 | public static function parseCacheControl($value) { | |
be2fb01f | 64 | $result = []; |
5063e355 TO |
65 | |
66 | $parts = preg_split('/, */', $value); | |
67 | foreach ($parts as $part) { | |
68 | if (strpos($part, '=') !== FALSE) { | |
69 | list ($key, $value) = explode('=', $part, 2); | |
70 | $result[$key] = $value; | |
71 | } | |
72 | else { | |
73 | $result[$part] = TRUE; | |
74 | } | |
75 | } | |
76 | ||
77 | return $result; | |
78 | } | |
79 | ||
80 | } |