1 | <?php |
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2 | /** |
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3 | * ElggHMACCache |
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4 | * Store cached data in a temporary database, only used by the HMAC stuff. |
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5 | * |
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6 | * @package Elgg.Core |
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7 | * @subpackage HMAC |
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8 | */ |
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9 | class ElggHMACCache extends ElggCache { |
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10 | /** |
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11 | * Set the Elgg cache. |
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12 | * |
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13 | * @param int $max_age Maximum age in seconds, 0 if no limit. |
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14 | */ |
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15 | function __construct($max_age = 0) { |
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16 | $this->setVariable("max_age", $max_age); |
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17 | } |
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18 | |||
19 | /** |
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20 | * Save a key |
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21 | * |
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22 | * @param string $key Name |
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23 | * @param string $data Value |
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24 | * @param int $expire_after Number of seconds to expire cache after |
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25 | * |
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26 | * @return boolean |
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27 | */ |
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28 | public function save($key, $data, $expire_after = null) { |
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29 | $dbprefix = elgg_get_config('dbprefix'); |
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30 | $key = sanitise_string($key); |
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31 | $time = time(); |
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32 | |||
33 | $query = "INSERT into {$dbprefix}hmac_cache (hmac, ts) VALUES ('$key', '$time')"; |
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34 | return insert_data($query); |
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35 | } |
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36 | |||
37 | /** |
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38 | * Load a key |
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39 | * |
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40 | * @param string $key Name |
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41 | * @param int $offset Offset |
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42 | * @param int $limit Limit |
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43 | * |
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44 | * @return string |
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45 | */ |
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46 | public function load($key, $offset = 0, $limit = null) { |
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47 | $dbprefix = elgg_get_config('dbprefix'); |
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48 | $key = sanitise_string($key); |
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49 | |||
50 | $row = get_data_row("SELECT * from {$dbprefix}hmac_cache where hmac='$key'"); |
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51 | if ($row) { |
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52 | return $row->hmac; |
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53 | } |
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54 | |||
55 | return false; |
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56 | } |
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57 | |||
58 | /** |
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59 | * Invalidate a given key. |
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60 | * |
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61 | * @param string $key Name |
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62 | * |
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63 | * @return bool |
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64 | */ |
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65 | public function delete($key) { |
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66 | $dbprefix = elgg_get_config('dbprefix'); |
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67 | $key = sanitise_string($key); |
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68 | |||
69 | return delete_data("DELETE from {$dbprefix}hmac_cache where hmac='$key'"); |
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70 | } |
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71 | |||
72 | /** |
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73 | * Clear out all the contents of the cache. |
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74 | * |
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75 | * Not currently implemented in this cache type. |
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76 | * |
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77 | * @return true |
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78 | */ |
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79 | public function clear() { |
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80 | return true; |
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81 | } |
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82 | |||
83 | /** |
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84 | * Clean out old stuff. |
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85 | * |
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86 | */ |
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87 | public function __destruct() { |
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88 | $dbprefix = elgg_get_config('dbprefix'); |
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89 | $time = time(); |
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90 | $age = (int) $this->getVariable("max_age"); |
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91 | |||
92 | $expires = $time - $age; |
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93 | |||
94 | delete_data("DELETE from {$dbprefix}hmac_cache where ts<$expires"); |
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95 | } |
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96 | } |
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97 |