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| 1 | <?php |
| 2 | /** |
| 3 | * PrivateBin |
| 4 | * |
| 5 | * a zero-knowledge paste bin |
| 6 | * |
| 7 | * @link https://github.com/PrivateBin/PrivateBin |
| 8 | * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net) |
| 9 | * @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License |
| 10 | * @version 1.7.2 |
| 11 | */ |
| 12 | |
| 13 | namespace PrivateBin\Persistence; |
| 14 | |
| 15 | use PrivateBin\Configuration; |
| 16 | |
| 17 | /** |
| 18 | * PurgeLimiter |
| 19 | * |
| 20 | * Handles purge limiting, so purging is not triggered too frequently. |
| 21 | */ |
| 22 | class PurgeLimiter extends AbstractPersistence |
| 23 | { |
| 24 | /** |
| 25 | * time limit in seconds, defaults to 300s |
| 26 | * |
| 27 | * @access private |
| 28 | * @static |
| 29 | * @var int |
| 30 | */ |
| 31 | private static $_limit = 300; |
| 32 | |
| 33 | /** |
| 34 | * set the time limit in seconds |
| 35 | * |
| 36 | * @access public |
| 37 | * @static |
| 38 | * @param int $limit |
| 39 | */ |
| 40 | public static function setLimit($limit) |
| 41 | { |
| 42 | self::$_limit = $limit; |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * set configuration options of the traffic limiter |
| 47 | * |
| 48 | * @access public |
| 49 | * @static |
| 50 | * @param Configuration $conf |
| 51 | */ |
| 52 | public static function setConfiguration(Configuration $conf) |
| 53 | { |
| 54 | self::setLimit($conf->getKey('limit', 'purge')); |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * check if the purge can be performed |
| 59 | * |
| 60 | * @access public |
| 61 | * @static |
| 62 | * @return bool |
| 63 | */ |
| 64 | public static function canPurge() |
| 65 | { |
| 66 | // disable limits if set to less then 1 |
| 67 | if (self::$_limit < 1) { |
| 68 | return true; |
| 69 | } |
| 70 | |
| 71 | $now = time(); |
| 72 | $pl = (int) self::$_store->getValue('purge_limiter'); |
| 73 | if ($pl + self::$_limit >= $now) { |
| 74 | return false; |
| 75 | } |
| 76 | $hasStored = self::$_store->setValue((string) $now, 'purge_limiter'); |
| 77 | if (!$hasStored) { |
| 78 | error_log('failed to store the purge limiter, skipping purge cycle to avoid getting stuck in a purge loop'); |
| 79 | } |
| 80 | return $hasStored; |
| 81 | } |
| 82 | } |