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<?php |
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namespace mindplay\kissform\Framework; |
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use mindplay\kissform\Facets\TokenStoreInterface; |
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use RuntimeException; |
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/** |
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* This class implements a token store using `$_SESSION`. |
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*/ |
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class SessionTokenStore implements TokenStoreInterface |
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{ |
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/** |
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* @var int hard limit for unique tokens stored per user session |
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*/ |
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const HARD_LIMIT = 10; |
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/** |
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* @var bool[] map of tokens validated and consumed during the lifetime of this object |
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*/ |
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private $valid = []; |
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/** |
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* @inheritdoc |
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* |
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* @throws RuntimeException |
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* |
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* @SuppressWarnings(Superglobals) |
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*/ |
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public function registerToken($token) |
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{ |
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if (!session_id()) { |
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throw new RuntimeException("no active session"); |
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} |
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if (!isset($_SESSION[__CLASS__])) { |
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$_SESSION[__CLASS__] = []; |
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} |
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$_SESSION[__CLASS__][$token] = true; |
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if (count($_SESSION[__CLASS__]) > self::HARD_LIMIT) { |
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// truncate garbage tokens (which may accummulate if the user keeps hitting "refresh") |
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$_SESSION[__CLASS__] = array_slice($_SESSION[__CLASS__], -self::HARD_LIMIT, null, true); |
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} |
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} |
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/** |
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* @inheritdoc |
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* |
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* @throws RuntimeException |
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* |
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* @SuppressWarnings(Superglobals) |
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*/ |
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public function verifyToken($token) |
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{ |
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if (!session_id()) { |
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throw new RuntimeException("no active session"); |
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} |
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if (isset($_SESSION[__CLASS__][$token])) { |
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unset($_SESSION[__CLASS__][$token]); |
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$this->valid[$token] = true; |
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} |
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return isset($this->valid[$token]); |
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} |
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/** |
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* @inheritdoc |
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* |
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* @SuppressWarnings(Superglobals) |
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*/ |
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public function getClientSalt() |
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{ |
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return @$_SERVER['REMOTE_ADDR'] . @$_SERVER['HTTP_USER_AGENT'] . session_id(); |
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} |
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} |
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mindplay-dk /
kissform
