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<?php |
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declare(strict_types=1); |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2017 Spomky-Labs |
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* |
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* This software may be modified and distributed under the terms |
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* of the MIT license. See the LICENSE file for details. |
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*/ |
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namespace Jose\Component\Signature; |
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use Base64Url\Base64Url; |
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/** |
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* Class able to parse JWS. |
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*/ |
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final class JWSParser |
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{ |
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/** |
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* Load data and return a JWS object. |
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* Compact, Flattened or complete serialization formats are supported. |
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* |
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* @param string $input A string that represents a JWS |
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* |
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* @return JWS |
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*/ |
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public static function parse(string $input): JWS |
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{ |
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$json = JWSConverter::convert($input); |
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$jws = JWS::create(); |
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foreach ($json['signatures'] as $signature) { |
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$bin_signature = Base64Url::decode($signature['signature']); |
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$protected_headers = self::getProtectedHeaders($signature); |
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$headers = self::getHeaders($signature); |
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$jws = $jws->addSignature($bin_signature, $protected_headers, $headers); |
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} |
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self::populatePayload($jws, $json); |
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return $jws; |
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} |
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/** |
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* @param array $data |
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* |
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* @return string|null |
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*/ |
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private static function getProtectedHeaders(array $data): ?string |
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{ |
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if (array_key_exists('protected', $data)) { |
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return $data['protected']; |
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} |
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return null; |
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} |
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/** |
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* @param array $data |
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* |
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* @return array |
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*/ |
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private static function getHeaders(array $data): array |
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{ |
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if (array_key_exists('header', $data)) { |
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return $data['header']; |
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} |
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return []; |
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} |
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/** |
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* @param JWS $jws |
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* @param array $data |
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*/ |
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private static function populatePayload(JWS &$jws, array $data) |
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{ |
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if (array_key_exists('payload', $data)) { |
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$isPayloadEncoded = null; |
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foreach ($jws->getSignatures() as $signature) { |
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if (null === $isPayloadEncoded) { |
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$isPayloadEncoded = self::isPayloadEncoded($signature); |
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} |
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if (self::isPayloadEncoded($signature) !== $isPayloadEncoded) { |
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throw new \InvalidArgumentException('Foreign payload encoding detected. The JWS cannot be loaded.'); |
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} |
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} |
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$payload = $data['payload']; |
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$jws = $jws->withAttachedPayload(); |
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$jws = $jws->withEncodedPayload($payload); |
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if (false !== $isPayloadEncoded) { |
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$payload = Base64Url::decode($payload); |
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} |
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$jws = $jws->withPayload($payload); |
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} else { |
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$jws = $jws->withDetachedPayload(); |
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} |
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} |
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/** |
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* @param Signature $signature |
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* |
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* @return bool |
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*/ |
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private static function isPayloadEncoded(Signature $signature): bool |
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{ |
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return !$signature->hasProtectedHeader('b64') || true === $signature->getProtectedHeader('b64'); |
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} |
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} |
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Spomky-Labs /
jose
