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<?php |
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namespace MediaMonks\SonataMediaBundle\Handler; |
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use MediaMonks\SonataMediaBundle\Exception\SignatureInvalidException; |
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use MediaMonks\SonataMediaBundle\Model\MediaInterface; |
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class SignatureParameterHandler implements ParameterHandlerInterface |
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{ |
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const PARAMETER_SIGNATURE = 's'; |
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const PARAMETER_BUST_CACHE = 'bc'; |
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/** |
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* @var string |
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*/ |
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private $key; |
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/** |
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* @var string |
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*/ |
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private $hashAlgorithm; |
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/** |
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* @param $key |
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* @param string $hashAlgorithm |
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*/ |
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public function __construct($key, $hashAlgorithm = 'sha256') |
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{ |
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$this->key = $key; |
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$this->hashAlgorithm = $hashAlgorithm; |
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} |
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/** |
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* @param MediaInterface $media |
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* @param ParameterBag $parameterBag |
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* @return array |
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*/ |
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public function getRouteParameters(MediaInterface $media, ParameterBag $parameterBag) |
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{ |
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$parameters = $parameterBag->toArray($media); |
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$parameters[self::PARAMETER_SIGNATURE] = $this->calculateSignature($parameters); |
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return $parameters; |
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} |
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/** |
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* @param MediaInterface $media |
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* @param $width |
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* @param $height |
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* @param array $extra |
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* @return ParameterBag |
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* @throws SignatureInvalidException |
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*/ |
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public function getPayload(MediaInterface $media, $width, $height, array $extra = []) |
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{ |
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if (!isset($extra[self::PARAMETER_SIGNATURE])) { |
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throw new SignatureInvalidException(); |
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} |
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$signature = $extra[self::PARAMETER_SIGNATURE]; |
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unset($extra[self::PARAMETER_SIGNATURE]); |
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$parameters = new ParameterBag($width, $height, $extra); |
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if (!$this->isValid($media, $parameters, $signature)) { |
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throw new SignatureInvalidException(); |
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} |
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return $parameters; |
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} |
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/** |
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* @param MediaInterface $media |
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* @param ParameterBag $parameters |
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* @param $expectedSignature |
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* @return bool |
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*/ |
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private function isValid(MediaInterface $media, ParameterBag $parameters, $expectedSignature) |
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{ |
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return hash_equals($this->calculateSignature($parameters->toArray($media)), $expectedSignature); |
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} |
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/** |
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* @param array $parameters |
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* @return string |
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*/ |
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private function calculateSignature(array $parameters) |
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{ |
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return hash_hmac($this->hashAlgorithm, $this->key, json_encode($this->normalize($parameters))); |
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} |
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/** |
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* @param array $parameters |
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* @return array |
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*/ |
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private function normalize(array $parameters) |
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{ |
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if (isset($parameters[self::PARAMETER_BUST_CACHE])) { |
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unset($parameters[self::PARAMETER_BUST_CACHE]); |
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} |
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ksort($parameters); |
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return array_map('strval', $parameters); |
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} |
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} |
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mediamonks /
symfony-sonata-media-bundle
