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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($input); |
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$isPayloadEncoded = null; |
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if (array_key_exists('payload', $json)) { |
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$rawPayload = $json['payload']; |
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} else { |
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$rawPayload = null; |
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} |
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$signatures = []; |
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foreach ($json['signatures'] as $signature) { |
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$encodedProtectedHeaders = self::getProtectedHeaders($signature); |
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$protectedHeaders = null !== $encodedProtectedHeaders ? json_decode(Base64Url::decode($encodedProtectedHeaders), true) : []; |
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$signatures[] = [ |
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'signature' => Base64Url::decode($signature['signature']), |
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'protected' => $protectedHeaders, |
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'encoded_protected' => $encodedProtectedHeaders, |
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'header' => self::getHeaders($signature), |
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]; |
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if (null === $isPayloadEncoded) { |
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$isPayloadEncoded = self::isPayloadEncoded($protectedHeaders); |
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} |
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if (self::isPayloadEncoded($protectedHeaders) !== $isPayloadEncoded) { |
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throw new \InvalidArgumentException('Foreign payload encoding detected.'); |
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} |
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} |
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if (null === $rawPayload) { |
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$payload = null; |
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} else { |
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$payload = false === $isPayloadEncoded ? $rawPayload : Base64Url::decode($rawPayload); |
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} |
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$jws = JWS::create($payload, $rawPayload); |
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foreach ($signatures as $signature) { |
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$jws = $jws->addSignature( |
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$signature['signature'], |
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$signature['protected'], |
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$signature['encoded_protected'], |
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$signature['header'] |
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); |
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} |
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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 array $protectedHeaders |
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* |
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* @return bool |
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*/ |
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private static function isPayloadEncoded(array $protectedHeaders): bool |
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{ |
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return !array_key_exists('b64', $protectedHeaders) || true === $protectedHeaders['b64']; |
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} |
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} |
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Spomky-Labs /
jose
