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<?php |
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namespace UMA\Psr\Http\Message\HMAC; |
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use Psr\Http\Message\MessageInterface; |
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use UMA\Psr\Http\Message\Internal\HashCalculator; |
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use UMA\Psr\Http\Message\Internal\HeaderValidator; |
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use UMA\Psr\Http\Message\Serializer\MessageSerializer; |
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class Verifier |
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{ |
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/** |
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* @var HashCalculator |
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*/ |
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private $calculator; |
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/** |
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* @var null|int |
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*/ |
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private $maxDelay = null; |
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/** |
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* @var HeaderValidator |
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*/ |
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private $validator; |
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public function __construct() |
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{ |
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$this->calculator = new HashCalculator(); |
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$this->validator = (new HeaderValidator()) |
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->addRule(Specification::AUTH_HEADER, Specification::AUTH_REGEXP) |
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->addRule(Specification::SIGN_HEADER, Specification::SIGN_REGEXP); |
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} |
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/** |
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* @param int $maxDelay |
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* |
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* @return Verifier |
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*/ |
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public function setMaximumDelay($maxDelay) |
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{ |
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$this->maxDelay = $maxDelay; |
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return $this; |
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} |
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/** |
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* @param MessageInterface $message |
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* @param string $secret |
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* |
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* @return bool Signature verification outcome. |
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* |
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* @throws \InvalidArgumentException When $message is an implementation of |
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* MessageInterface that cannot be |
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* serialized and thus neither verified. |
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*/ |
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public function verify(MessageInterface $message, $secret) |
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{ |
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if (false === $matches = $this->validator->conforms($message)) { |
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return false; |
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} |
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$clientSideSignature = $matches[Specification::AUTH_HEADER][1]; |
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$serverSideSignature = $this->calculator |
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->hmac(MessageSerializer::serialize($this->withoutUnsignedHeaders($message)), $secret); |
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if (!hash_equals($serverSideSignature, $clientSideSignature) || $this->delayed($message)) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* @param MessageInterface $message |
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* |
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* @return MessageInterface |
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*/ |
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private function withoutUnsignedHeaders(MessageInterface $message) |
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{ |
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$signedHeaders = array_filter(explode(',', $message->getHeaderLine(Specification::SIGN_HEADER))); |
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foreach ($message->getHeaders() as $name => $value) { |
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if (!in_array(mb_strtolower($name), $signedHeaders)) { |
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$message = $message->withoutHeader($name); |
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} |
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} |
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return $message; |
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} |
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/** |
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* @param MessageInterface $message |
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* |
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* @return bool |
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*/ |
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private function delayed(MessageInterface $message) |
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{ |
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$currentTimestamp = (new \DateTime('now', new \DateTimeZone('GMT')))->getTimestamp(); |
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$messageTimestamp = (new \DateTime($message->getHeaderLine(Specification::DATE_HEADER)))->getTimestamp(); |
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return is_int($this->maxDelay) && $currentTimestamp - $messageTimestamp > $this->maxDelay; |
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} |
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} |
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1ma /
Psr7Hmac
