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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\Serializer\MessageSerializer; |
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class Verifier |
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{ |
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/** |
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* @var Calculator |
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*/ |
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private $calculator; |
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public function __construct() |
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{ |
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$this->calculator = new Calculator(); |
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72 |
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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, $secret) |
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{ |
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if (0 === preg_match( |
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'#^'.Specification::AUTH_PREFIX.' ([+/0-9A-Za-z]{43}=)$#', |
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$message->getHeaderLine(Specification::AUTH_HEADER), $matches) |
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) { |
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return false; |
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} |
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$clientSideSignature = $matches[1]; |
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$serverSideSignature = $this->calculator |
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->hmac(MessageSerializer::serialize($this->withoutUnsignedHeaders($message)), $secret); |
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return hash_equals($serverSideSignature, $clientSideSignature); |
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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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1ma /
Psr7Hmac
