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<?php namespace Yoast\WP\SEO\Config; use Exception; use Yoast\WP\SEO\Exceptions\OAuth\Authentication_Failed_Exception; use Yoast\WP\SEO\Exceptions\OAuth\Tokens\Empty_Property_Exception; use Yoast\WP\SEO\Exceptions\OAuth\Tokens\Empty_Token_Exception; use Yoast\WP\SEO\Exceptions\OAuth\Tokens\Failed_Storage_Exception; use Yoast\WP\SEO\Helpers\Options_Helper; use Yoast\WP\SEO\Values\OAuth\OAuth_Token; use YoastSEO_Vendor\League\OAuth2\Client\Provider\Exception\IdentityProviderException; use YoastSEO_Vendor\League\OAuth2\Client\Provider\GenericProvider; /** * Class OAuth_Client */ abstract class OAuth_Client { /** * The option's key. * * @var string */ protected $token_option = null; /** * The provider. * * @var Wincher_PKCE_Provider|GenericProvider */ protected $provider; /** * The options helper. * * @var Options_Helper */ protected $options_helper; /** * The token. * * @var OAuth_Token|null */ protected $token = null; /** * OAuth_Client constructor. * * @param string $token_option The option's name to save the token as. * @param Wincher_PKCE_Provider|GenericProvider $provider The provider. * @param Options_Helper $options_helper The Options_Helper instance. * * @throws Empty_Property_Exception Exception thrown if a token property is empty. */ public function __construct( $token_option, $provider, Options_Helper $options_helper ) { $this->provider = $provider; $this->token_option = $token_option; $this->options_helper = $options_helper; $tokens = $this->options_helper->get( $this->token_option ); if ( ! empty( $tokens ) ) { $this->token = new OAuth_Token( $tokens['access_token'], $tokens['refresh_token'], $tokens['expires'], $tokens['has_expired'], $tokens['created_at'], ( $tokens['error_count'] ?? 0 ) ); } } /** * Requests the access token and refresh token based on the passed code. * * @param string $code The code to send. * * @return OAuth_Token The requested tokens. * * @throws Authentication_Failed_Exception Exception thrown if authentication has failed. */ public function request_tokens( $code ) { try { $response = $this->provider ->getAccessToken( 'authorization_code', [ 'code' => $code, ] ); $token = OAuth_Token::from_response( $response ); return $this->store_token( $token ); } catch ( Exception $exception ) { throw new Authentication_Failed_Exception( $exception ); } } /** * Performs an authenticated GET request to the desired URL. * * @param string $url The URL to send the request to. * @param array $options The options to pass along to the request. * * @return mixed The parsed API response. * * @throws IdentityProviderException Exception thrown if there's something wrong with the identifying data. * @throws Authentication_Failed_Exception Exception thrown if authentication has failed. * @throws Empty_Token_Exception Exception thrown if the token is empty. */ public function get( $url, $options = [] ) { return $this->do_request( 'GET', $url, $options ); } /** * Performs an authenticated POST request to the desired URL. * * @param string $url The URL to send the request to. * @param mixed $body The data to send along in the request's body. * @param array $options The options to pass along to the request. * * @return mixed The parsed API response. * * @throws IdentityProviderException Exception thrown if there's something wrong with the identifying data. * @throws Authentication_Failed_Exception Exception thrown if authentication has failed. * @throws Empty_Token_Exception Exception thrown if the token is empty. */ public function post( $url, $body, $options = [] ) { $options['body'] = $body; return $this->do_request( 'POST', $url, $options ); } /** * Performs an authenticated DELETE request to the desired URL. * * @param string $url The URL to send the request to. * @param array $options The options to pass along to the request. * * @return mixed The parsed API response. * * @throws IdentityProviderException Exception thrown if there's something wrong with the identifying data. * @throws Authentication_Failed_Exception Exception thrown if authentication has failed. * @throws Empty_Token_Exception Exception thrown if the token is empty. */ public function delete( $url, $options = [] ) { return $this->do_request( 'DELETE', $url, $options ); } /** * Determines whether there are valid tokens available. * * @return bool Whether there are valid tokens. */ public function has_valid_tokens() { return ! empty( $this->token ) && $this->token->has_expired() === false; } /** * Gets the stored tokens and refreshes them if they've expired. * * @return OAuth_Token The stored tokens. * * @throws Empty_Token_Exception Exception thrown if the token is empty. */ public function get_tokens() { if ( empty( $this->token ) ) { throw new Empty_Token_Exception(); } if ( $this->token->has_expired() ) { $this->token = $this->refresh_tokens( $this->token ); } return $this->token; } /** * Stores the passed token. * * @param OAuth_Token $token The token to store. * * @return OAuth_Token The stored token. * * @throws Failed_Storage_Exception Exception thrown if storing of the token fails. */ public function store_token( OAuth_Token $token ) { $saved = $this->options_helper->set( $this->token_option, $token->to_array() ); if ( $saved === false ) { throw new Failed_Storage_Exception(); } return $token; } /** * Clears the stored token from storage. * * @return bool The stored token. * * @throws Failed_Storage_Exception Exception thrown if clearing of the token fails. */ public function clear_token() { $saved = $this->options_helper->set( $this->token_option, [] ); if ( $saved === false ) { throw new Failed_Storage_Exception(); } return true; } /** * Performs the specified request. * * @param string $method The HTTP method to use. * @param string $url The URL to send the request to. * @param array $options The options to pass along to the request. * * @return mixed The parsed API response. * * @throws IdentityProviderException Exception thrown if there's something wrong with the identifying data. * @throws Authentication_Failed_Exception Exception thrown if authentication has failed. * @throws Empty_Token_Exception Exception thrown if the token is empty. */ protected function do_request( $method, $url, array $options ) { $defaults = [ 'headers' => $this->provider->getHeaders( $this->get_tokens()->access_token ), ]; $options = \array_merge_recursive( $defaults, $options ); if ( \array_key_exists( 'params', $options ) ) { $url .= '?' . \http_build_query( $options['params'] ); unset( $options['params'] ); } $request = $this->provider ->getAuthenticatedRequest( $method, $url, null, $options ); return $this->provider->getParsedResponse( $request ); } /** * Refreshes the outdated tokens. * * @param OAuth_Token $tokens The outdated tokens. * * @return OAuth_Token The refreshed tokens. * * @throws Authentication_Failed_Exception Exception thrown if authentication has failed. */ protected function refresh_tokens( OAuth_Token $tokens ) { // We do this dance with transients since we need to make sure we don't // delete valid tokens because of a race condition when two calls are // made simultaneously to this function and refresh token rotation is // turned on in the OAuth server. This is not 100% safe, but should at // least be much better than not having any lock at all. $lock_name = \sprintf( 'lock:%s', $this->token_option ); $can_lock = \get_transient( $lock_name ) === false; $has_lock = $can_lock && \set_transient( $lock_name, true, 30 ); try { $new_tokens = $this->provider->getAccessToken( 'refresh_token', [ 'refresh_token' => $tokens->refresh_token, ] ); $token_obj = OAuth_Token::from_response( $new_tokens ); return $this->store_token( $token_obj ); } catch ( Exception $exception ) { // If we tried to refresh but the refresh token is invalid, delete // the tokens so that we don't try again. Only do this if we got the // lock at the beginning of the call. if ( $has_lock && $exception->getMessage() === 'invalid_grant' ) { try { // To protect from race conditions, only do this if we've // seen an error before with the same token. if ( $tokens->error_count >= 1 ) { $this->clear_token(); } else { $tokens->error_count += 1; $this->store_token( $tokens ); } } catch ( Exception $e ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch // Pass through. } } throw new Authentication_Failed_Exception( $exception ); } finally { \delete_transient( $lock_name ); } } }
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