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<?php |
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namespace mindplay\kissform\Framework; |
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use mindplay\kissform\Facets\TokenServiceInterface; |
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use mindplay\kissform\Facets\TokenStoreInterface; |
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class TokenService implements TokenServiceInterface |
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{ |
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/** |
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* @var string hash algorithm |
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*/ |
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const HASH_ALGO = 'sha512'; |
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/** |
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* @var string timestamp key |
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*/ |
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const KEY_TIMESTAMP = 'T'; |
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/** |
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* @var string salt key |
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*/ |
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const KEY_SALT = 'S'; |
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/** |
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* @var string hash key |
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*/ |
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const KEY_HASH = 'H'; |
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/** |
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* @var int token is valid n seconds from now (prevents submission quicker than a human) |
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*/ |
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public $valid_from = 5; |
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/** |
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* @var int token is valid until n seconds from now (token expires after this time) |
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*/ |
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public $valid_to = 1200; |
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/** |
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* @var string secret salt |
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*/ |
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private $secret; |
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/** |
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* @var TokenStoreInterface |
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*/ |
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private $store; |
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/** |
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* @var int timestamp |
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*/ |
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public $timestamp; |
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/** |
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* @param TokenStoreInterface $store |
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* @param string $secret secret salt (unique to your form or controller) |
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*/ |
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public function __construct(TokenStoreInterface $store, $secret) |
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{ |
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$this->secret = $secret; |
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$this->store = $store; |
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$this->timestamp = time(); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function createToken($name) |
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{ |
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$salt = sha1(microtime(true) . rand(0, 9999999)); |
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$hash = $this->hash($name, $salt, $this->timestamp); |
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$token = base64_encode(json_encode([ |
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self::KEY_TIMESTAMP => $this->timestamp, |
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self::KEY_SALT => $salt, |
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self::KEY_HASH => $hash, |
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])); |
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$this->store->registerToken($token); |
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return $token; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function checkToken($name, $token) |
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{ |
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if (!$this->store->verifyToken($token)) { |
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return false; // no such token was issued |
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} |
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$data = @json_decode(base64_decode($token), true); |
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if (!isset($data[self::KEY_TIMESTAMP], $data[self::KEY_SALT], $data[self::KEY_HASH])) { |
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return false; // invalid token |
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} |
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$timestamp = $data[self::KEY_TIMESTAMP]; |
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$salt = $data[self::KEY_SALT]; |
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$hash = $data[self::KEY_HASH]; |
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if ($hash !== $this->hash($name, $salt, $timestamp)) { |
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return false; // wrong hash |
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} |
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$time = $this->timestamp - $timestamp; |
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return ($time >= $this->valid_from) |
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&& ($time <= $this->valid_to); |
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} |
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/** |
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* @param string $name |
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* @param string $salt |
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* @param int $timestamp |
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* |
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* @return string |
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*/ |
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private function hash($name, $salt, $timestamp) |
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{ |
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$data = $salt . $timestamp . $this->store->getClientSalt(); |
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return hash_hmac(self::HASH_ALGO, $data, $this->secret); |
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} |
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} |
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mindplay-dk /
kissform
This check looks from parameters that have been defined for a function or method, but which are not used in the method body.