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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 Psr\Http\Message\RequestInterface; |
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use UMA\Psr\Http\Message\Internal\HashCalculator; |
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use UMA\Psr\Http\Message\Internal\TimeProvider; |
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use UMA\Psr\Http\Message\Serializer\MessageSerializer; |
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class Signer |
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{ |
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/** |
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* @var string |
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*/ |
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private $secret; |
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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 TimeProvider |
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*/ |
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private $timeProvider; |
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/** |
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* @param string $secret |
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*/ |
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public function __construct($secret) |
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{ |
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$this->secret = $secret; |
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$this->calculator = new HashCalculator(); |
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$this->timeProvider = new TimeProvider(); |
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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 The signed message. |
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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 signed. |
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*/ |
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public function sign(MessageInterface $message) |
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{ |
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$serialization = MessageSerializer::serialize( |
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$preSignedMessage = $this->withSignedHeadersHeader($this->withDateHeader($message)) |
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); |
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return $preSignedMessage->withHeader( |
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Specification::AUTH_HEADER, |
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Specification::AUTH_PREFIX.$this->calculator->hmac($serialization, $this->secret) |
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); |
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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 withSignedHeadersHeader(MessageInterface $message) |
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{ |
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$headers = array_keys(array_change_key_case($message->getHeaders(), CASE_LOWER)); |
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array_push($headers, mb_strtolower(Specification::SIGN_HEADER)); |
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// Some of the tested RequestInterface implementations do not include |
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// the Host header in $message->getHeaders(), so it is explicitly set when needed |
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if ($message instanceof RequestInterface && !in_array('host', $headers)) { |
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array_push($headers, 'host'); |
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} |
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// There is no guarantee about the order of the headers returned by |
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// $message->getHeaders(), so they are explicitly sorted in order |
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// to produce the exact same string regardless of the underlying implementation |
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sort($headers); |
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return $message->withHeader(Specification::SIGN_HEADER, implode(',', $headers)); |
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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 withDateHeader(MessageInterface $message) |
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{ |
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return $message->withHeader(Specification::DATE_HEADER, $this->timeProvider->currentTime()); |
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} |
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} |
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1ma /
Psr7Hmac
