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<?php |
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namespace Parroauth2\Client\Extension; |
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use Base64Url\Base64Url; |
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use Parroauth2\Client\EndPoint\Authorization\AuthorizationEndPoint; |
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use Parroauth2\Client\EndPoint\EndPointTransformerTrait; |
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use Parroauth2\Client\EndPoint\Token\TokenEndPoint; |
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/** |
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* Extension for enable Proof Key for Code Exchange |
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* This extension may be register even if the provider do not supports PKCE |
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* |
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* Client options : |
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* - code_challenge_method : "plain" | "S256" Configure the code challenge method. This option is case sensitive |
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* |
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* @see https://tools.ietf.org/html/rfc7636 |
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*/ |
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final class Pkce extends AbstractEndPointTransformerExtension |
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{ |
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use EndPointTransformerTrait; |
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public const METHOD_PLAIN = 'plain'; |
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public const METHOD_S256 = 'S256'; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function onAuthorization(AuthorizationEndPoint $endPoint): AuthorizationEndPoint |
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{ |
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$codeVerifier = Base64Url::encode(random_bytes(96)); |
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$this->client()->storage()->store('code_verifier', $codeVerifier); |
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$codeChallengeMethod = $this->codeChallengeMethod(); |
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switch ($codeChallengeMethod) { |
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case self::METHOD_PLAIN: |
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$codeChallenge = $codeVerifier; |
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2 |
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break; |
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case self::METHOD_S256: |
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$codeChallenge = Base64Url::encode(hash('sha256', $codeVerifier, true)); |
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break; |
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default: |
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throw new \LogicException('Unsupported code challenge method ' . $codeChallengeMethod); |
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} |
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return $endPoint |
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->set('code_challenge', $codeChallenge) |
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->set('code_challenge_method', $codeChallengeMethod) |
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; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function onToken(TokenEndPoint $endPoint): TokenEndPoint |
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{ |
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1 |
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if ($codeVerifier = $this->client()->storage()->remove('code_verifier')) { |
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1 |
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return $endPoint->set('code_verifier', $codeVerifier); |
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} |
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return $endPoint; |
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} |
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/** |
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* Get the supported code challenge method |
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* |
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* @return string |
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*/ |
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private function codeChallengeMethod(): string |
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{ |
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if ($method = $this->client()->clientConfig()->option('code_challenge_method')) { |
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return $method; |
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} |
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// Provider supports S256 |
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if ( |
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in_array( |
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self::METHOD_S256, |
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$this->client()->provider()->metadata('code_challenge_methods_supported', [self::METHOD_S256]) |
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) |
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) { |
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return self::METHOD_S256; |
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} |
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return self::METHOD_PLAIN; |
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} |
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} |
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b2pweb /
parroauth2-client
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