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<?php namespace Yoast\WP\SEO\Config; use Exception; use UnexpectedValueException; use YoastSEO_Vendor\GuzzleHttp\Exception\BadResponseException; use YoastSEO_Vendor\League\OAuth2\Client\Provider\Exception\IdentityProviderException; use YoastSEO_Vendor\League\OAuth2\Client\Provider\GenericProvider; use YoastSEO_Vendor\League\OAuth2\Client\Token\AccessToken; use YoastSEO_Vendor\League\OAuth2\Client\Token\AccessTokenInterface; use YoastSEO_Vendor\League\OAuth2\Client\Tool\BearerAuthorizationTrait; use YoastSEO_Vendor\Psr\Http\Message\RequestInterface; use YoastSEO_Vendor\Psr\Log\InvalidArgumentException; /** * Class Wincher_PKCE_Provider * * @codeCoverageIgnore Ignoring as this class is purely a temporary wrapper until https://github.com/thephpleague/oauth2-client/pull/901 is merged. * * @phpcs:disable WordPress.NamingConventions.ValidVariableName.PropertyNotSnakeCase -- This class extends an external class. * @phpcs:disable WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase -- This class extends an external class. / class Wincher_PKCE_Provider extends GenericProvider { use BearerAuthorizationTrait; /* * The method to use. * * @var string\|null / protected $pkceMethod = null; /* * The PKCE code. * * @var string / protected $pkceCode; /* * Set the value of the pkceCode parameter. * * When using PKCE this should be set before requesting an access token. * * @param string $pkce_code The value for the pkceCode. * @return self / public function setPkceCode( $pkce_code ) { $this->pkceCode = $pkce_code; return $this; } /* * Returns the current value of the pkceCode parameter. * * This can be accessed by the redirect handler during authorization. * * @return string / public function getPkceCode() { return $this->pkceCode; } /* * Returns a new random string to use as PKCE code_verifier and * hashed as code_challenge parameters in an authorization flow. * Must be between 43 and 128 characters long. * * @param int $length Length of the random string to be generated. * * @return string * * @throws Exception Throws exception if an invalid value is passed to random_bytes. / protected function getRandomPkceCode( $length = 64 ) { return \substr( \strtr( // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode \base64_encode( \random_bytes( $length ) ), '+/', '-_' ), 0, $length ); } /* * Returns the current value of the pkceMethod parameter. * * @return string\|null / protected function getPkceMethod() { return $this->pkceMethod; } /* * Returns authorization parameters based on provided options. * * @param array $options The options to use in the authorization parameters. * * @return array The authorization parameters * * @throws InvalidArgumentException Throws exception if an invalid PCKE method is passed in the options. * @throws Exception When something goes wrong with generating the PKCE code. / protected function getAuthorizationParameters( array $options ) { if ( empty( $options['state'] ) ) { $options['state'] = $this->getRandomState(); } if ( empty( $options['scope'] ) ) { $options['scope'] = $this->getDefaultScopes(); } $options += [ 'response_type' => 'code', ]; if ( \is_array( $options['scope'] ) ) { $separator = $this->getScopeSeparator(); $options['scope'] = \implode( $separator, $options['scope'] ); } // Store the state as it may need to be accessed later on. $this->state = $options['state']; $pkce_method = $this->getPkceMethod(); if ( ! empty( $pkce_method ) ) { $this->pkceCode = $this->getRandomPkceCode(); if ( $pkce_method === 'S256' ) { $options['code_challenge'] = \trim( \strtr( // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode \base64_encode( \hash( 'sha256', $this->pkceCode, true ) ), '+/', '-_' ), '=' ); } elseif ( $pkce_method === 'plain' ) { $options['code_challenge'] = $this->pkceCode; } else { throw new InvalidArgumentException( 'Unknown PKCE method "' . $pkce_method . '".' ); } $options['code_challenge_method'] = $pkce_method; } // Business code layer might set a different redirect_uri parameter. // Depending on the context, leave it as-is. if ( ! isset( $options['redirect_uri'] ) ) { $options['redirect_uri'] = $this->redirectUri; } $options['client_id'] = $this->clientId; return $options; } /* * Requests an access token using a specified grant and option set. * * @param mixed $grant The grant to request access for. * @param array $options The options to use with the current request. * * @return AccessToken\|AccessTokenInterface The access token. * * @throws UnexpectedValueException Exception thrown if the provider response contains errors. / public function getAccessToken( $grant, array $options = [] ) { $grant = $this->verifyGrant( $grant ); $params = [ 'client_id' => $this->clientId, 'client_secret' => $this->clientSecret, 'redirect_uri' => $this->redirectUri, ]; if ( ! empty( $this->pkceCode ) ) { $params['code_verifier'] = $this->pkceCode; } $params = $grant->prepareRequestParameters( $params, $options ); $request = $this->getAccessTokenRequest( $params ); $response = $this->getParsedResponse( $request ); if ( \is_array( $response ) === false ) { throw new UnexpectedValueException( 'Invalid response received from Authorization Server. Expected JSON.' ); } $prepared = $this->prepareAccessTokenResponse( $response ); $token = $this->createAccessToken( $prepared, $grant ); return $token; } /* * Returns all options that can be configured. * * @return array The configurable options. / protected function getConfigurableOptions() { return \array_merge( $this->getRequiredOptions(), [ 'accessTokenMethod', 'accessTokenResourceOwnerId', 'scopeSeparator', 'responseError', 'responseCode', 'responseResourceOwnerId', 'scopes', 'pkceMethod', ] ); } /* * Parses the request response. * * @param RequestInterface $request The request interface. * * @return array The parsed response. * * @throws IdentityProviderException Exception thrown if there is no proper identity provider. */ public function getParsedResponse( RequestInterface $request ) { try { $response = $this->getResponse( $request ); } catch ( BadResponseException $e ) { $response = $e->getResponse(); } $parsed = $this->parseResponse( $response ); $this->checkResponse( $response, $parsed ); // We always expect an array from the API except for on DELETE requests. // We convert to an array here to prevent problems with array_key_exists on PHP8. if ( ! \is_array( $parsed ) ) { $parsed = [ 'data' => [] ]; } // Add the response code as this is omitted from Winchers API. if ( ! \array_key_exists( 'status', $parsed ) ) { $parsed['status'] = $response->getStatusCode(); } return $parsed; } }

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