Commit | Line | Data |
---|---|---|
5063e355 | 1 | <?php |
50bfb460 SB |
2 | /* |
3 | +--------------------------------------------------------------------+ | |
bc77d7c0 | 4 | | Copyright CiviCRM LLC. All rights reserved. | |
50bfb460 | 5 | | | |
bc77d7c0 TO |
6 | | This work is published under the GNU AGPLv3 license with some | |
7 | | permitted exceptions and without any warranty. For full license | | |
8 | | and copyright information, see https://civicrm.org/licensing | | |
50bfb460 SB |
9 | +--------------------------------------------------------------------+ |
10 | */ | |
5063e355 | 11 | |
50bfb460 SB |
12 | /** |
13 | * | |
14 | * @package CiviCRM_Hook | |
ca5cec67 | 15 | * @copyright CiviCRM LLC https://civicrm.org/licensing |
50bfb460 | 16 | */ |
5063e355 TO |
17 | class CRM_Utils_Http { |
18 | ||
19 | /** | |
20 | * Parse the expiration time from a series of HTTP headers. | |
21 | * | |
22 | * @param array $headers | |
e97c66ff | 23 | * @return int|null |
5063e355 TO |
24 | * Expiration tme as seconds since epoch, or NULL if not cacheable. |
25 | */ | |
26 | public static function parseExpiration($headers) { | |
27 | $headers = CRM_Utils_Array::rekey($headers, function ($k, $v) { | |
28 | return strtolower($k); | |
29 | }); | |
30 | ||
31 | if (!empty($headers['cache-control'])) { | |
32 | $cc = self::parseCacheControl($headers['cache-control']); | |
33 | if ($cc['max-age'] && is_numeric($cc['max-age'])) { | |
34 | return CRM_Utils_Time::getTimeRaw() + $cc['max-age']; | |
35 | } | |
36 | } | |
37 | ||
38 | return NULL; | |
39 | } | |
40 | ||
41 | /** | |
42 | * @param string $value | |
43 | * Ex: "max-age=86400, public". | |
44 | * @return array | |
45 | * Ex: Array("max-age"=>86400, "public"=>1). | |
46 | */ | |
47 | public static function parseCacheControl($value) { | |
be2fb01f | 48 | $result = []; |
5063e355 TO |
49 | |
50 | $parts = preg_split('/, */', $value); | |
51 | foreach ($parts as $part) { | |
52 | if (strpos($part, '=') !== FALSE) { | |
53 | list ($key, $value) = explode('=', $part, 2); | |
54 | $result[$key] = $value; | |
55 | } | |
56 | else { | |
57 | $result[$part] = TRUE; | |
58 | } | |
59 | } | |
60 | ||
61 | return $result; | |
62 | } | |
63 | ||
64 | } |