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<?php |
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/** |
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* Payments controller |
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* |
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* @author Pronamic <[email protected]> |
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* @copyright 2005-2020 Pronamic |
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* @license GPL-3.0-or-later |
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* @package Pronamic\WordPress\Pay\Gateways\Adyen |
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*/ |
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namespace Pronamic\WordPress\Pay\Gateways\Adyen; |
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use JsonSchema\Exception\ValidationException; |
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use Pronamic\WordPress\Pay\Core\Server; |
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use Pronamic\WordPress\Pay\Plugin; |
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use WP_REST_Request; |
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/** |
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* Payments result controller |
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* |
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* @link https://docs.adyen.com/developers/checkout/web-sdk/customization/logic#beforecomplete |
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* |
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* @author Reüel van der Steege |
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* @version 1.1.1 |
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* @since 1.1.0 |
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*/ |
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class PaymentsController { |
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/** |
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* Setup. |
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* |
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* @return void |
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*/ |
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public function setup() { |
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add_action( 'rest_api_init', array( $this, 'rest_api_init' ) ); |
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} |
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/** |
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* REST API init. |
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* |
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* @link https://developer.wordpress.org/rest-api/extending-the-rest-api/adding-custom-endpoints/ |
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* @link https://developer.wordpress.org/reference/hooks/rest_api_init/ |
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* |
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* @return void |
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*/ |
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public function rest_api_init() { |
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// Register REST route `/payments//{payment_id}`. |
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register_rest_route( |
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Integration::REST_ROUTE_NAMESPACE, |
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'/payments/(?P<payment_id>\d+)', |
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array( |
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'methods' => 'POST', |
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'callback' => array( $this, 'rest_api_adyen_payments' ), |
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'args' => array( |
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'payment_id' => array( |
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'description' => __( 'Payment ID.', 'pronamic_ideal' ), |
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'type' => 'integer', |
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), |
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), |
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) |
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); |
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// Register REST route `/payments/details/{payment_id}`. |
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register_rest_route( |
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Integration::REST_ROUTE_NAMESPACE, |
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'/payments/details/(?P<payment_id>\d+)', |
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array( |
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'methods' => 'POST', |
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'callback' => array( $this, 'rest_api_adyen_payment_details' ), |
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'args' => array( |
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'payment_id' => array( |
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'description' => __( 'Payment ID.', 'pronamic_ideal' ), |
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'type' => 'integer', |
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), |
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), |
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) |
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); |
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// Register REST route `/payments/applepay/merchant-validation/`. |
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register_rest_route( |
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Integration::REST_ROUTE_NAMESPACE, |
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'/payments/applepay/merchant-validation/(?P<payment_id>\d+)', |
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array( |
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'methods' => 'POST', |
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'callback' => array( $this, 'rest_api_applepay_merchant_validation' ), |
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'args' => array( |
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'payment_id' => array( |
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'description' => __( 'Payment ID.', 'pronamic_ideal' ), |
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'type' => 'integer', |
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), |
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), |
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) |
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); |
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} |
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/** |
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* REST API Adyen payments handler. |
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* |
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* @param WP_REST_Request $request Request. |
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* @return object |
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* @throws \Exception Throws exception on Adyen service exception response. |
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*/ |
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public function rest_api_adyen_payments( WP_REST_Request $request ) { |
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$payment_id = $request->get_param( 'payment_id' ); |
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// Payment ID. |
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if ( null === $payment_id ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-no-payment-id', |
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__( 'No payment ID given in `payment_id` parameter.', 'pronamic_ideal' ) |
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); |
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} |
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$payment = \get_pronamic_payment( $payment_id ); |
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if ( null === $payment ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-payment-not-found', |
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sprintf( |
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/* translators: %s: payment ID */ |
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__( 'Could not find payment with ID `%s`.', 'pronamic_ideal' ), |
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$payment_id |
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), |
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$payment_id |
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); |
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} |
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// State data. |
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$data = \json_decode( $request->get_body() ); |
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if ( null === $data ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-no-data', |
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__( 'No data given in request body.', 'pronamic_ideal' ) |
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); |
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} |
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// Gateway. |
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$config_id = $payment->get_config_id(); |
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if ( null === $config_id ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-no-config', |
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__( 'No gateway configuration ID given in payment.', 'pronamic_ideal' ) |
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); |
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} |
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$gateway = Plugin::get_gateway( $config_id ); |
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if ( empty( $gateway ) ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-gateway-not-found', |
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sprintf( |
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/* translators: %s: Gateway configuration ID */ |
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__( 'Could not find gateway with ID `%s`.', 'pronamic_ideal' ), |
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$config_id |
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), |
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$config_id |
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); |
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} |
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if ( ! isset( $gateway->client ) ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-client-not-found', |
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sprintf( |
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/* translators: %s: Gateway configuration ID */ |
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__( 'Could not find client in gateway with ID `%s`.', 'pronamic_ideal' ), |
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$config_id |
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), |
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$config_id |
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); |
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} |
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// Create payment. |
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// phpcs:ignore WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase -- Adyen JSON object. |
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if ( ! isset( $data->paymentMethod->type ) ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-no-payment-method', |
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__( 'No payment method given.', 'pronamic_ideal' ) |
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); |
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} |
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// phpcs:ignore WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase -- Adyen JSON object. |
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$payment_method = PaymentMethod::from_object( $data->paymentMethod ); |
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try { |
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if ( ! \is_callable( array( $gateway, 'create_payment' ) ) ) { |
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return (object) array( |
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'error' => __( 'Gateway does not support method to create payment.', 'pronamic_ideal' ), |
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); |
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} |
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try { |
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$response = $gateway->create_payment( $payment, $payment_method, $data ); |
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} catch ( \Pronamic\WordPress\Pay\Gateways\Adyen\ServiceException $service_exception ) { |
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$message = $service_exception->getMessage(); |
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$error_code = $service_exception->get_error_code(); |
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if ( ! empty( $error_code ) ) { |
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$message = sprintf( |
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/* translators: 1: error message, 2: error code */ |
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__( '%1$s (error %2$s)', 'pronamic_ideal' ), |
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$service_exception->getMessage(), |
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$error_code |
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); |
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} |
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throw new \Exception( $message ); |
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} |
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} catch ( \Exception $e ) { |
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$error = $e->getMessage(); |
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$error_code = $e->getCode(); |
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if ( ! empty( $error_code ) ) { |
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$error = sprintf( '%s - %s', $error_code, $e->getMessage() ); |
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} |
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return (object) array( 'error' => $error ); |
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} |
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// Update payment status based on response. |
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PaymentResponseHelper::update_payment( $payment, $response ); |
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$result = array( |
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'resultCode' => $response->get_result_code(), |
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); |
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// Return action if available. |
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$action = $response->get_action(); |
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if ( null !== $action ) { |
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$result['action'] = $action->get_json(); |
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} |
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// Return refusal reason if available. |
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$refusal_reason = $response->get_refusal_reason(); |
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if ( null !== $refusal_reason ) { |
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$result['refusalReason'] = $refusal_reason; |
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} |
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return (object) $result; |
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} |
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/** |
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* REST API Adyen payment details handler. |
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* |
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* @param WP_REST_Request $request Request. |
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* @return object |
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* @throws \Exception Throws exception on Adyen service exception response. |
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*/ |
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public function rest_api_adyen_payment_details( WP_REST_Request $request ) { |
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$payment_id = $request->get_param( 'payment_id' ); |
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// Payment ID. |
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if ( null === $payment_id ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-no-payment-id', |
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__( 'No payment ID given in `payment_id` parameter.', 'pronamic_ideal' ) |
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); |
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} |
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$payment = \get_pronamic_payment( $payment_id ); |
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if ( null === $payment ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-payment-not-found', |
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sprintf( |
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/* translators: %s: payment ID */ |
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__( 'Could not find payment with ID `%s`.', 'pronamic_ideal' ), |
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$payment_id |
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), |
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$payment_id |
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); |
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} |
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// State data. |
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$data = \json_decode( $request->get_body() ); |
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if ( null === $data ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-no-data', |
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__( 'No data given in request body.', 'pronamic_ideal' ) |
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); |
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} |
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// Gateway. |
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$config_id = $payment->get_config_id(); |
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if ( null === $config_id ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-no-config', |
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__( 'No gateway configuration ID given in payment.', 'pronamic_ideal' ) |
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); |
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} |
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$gateway = Plugin::get_gateway( $config_id ); |
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300
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if ( empty( $gateway ) ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-gateway-not-found', |
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sprintf( |
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/* translators: %s: Gateway configuration ID */ |
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__( 'Could not find gateway with ID `%s`.', 'pronamic_ideal' ), |
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$config_id |
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), |
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$config_id |
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); |
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} |
311
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|
312
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if ( ! isset( $gateway->client ) ) { |
313
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return new \WP_Error( |
314
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'pronamic-pay-adyen-client-not-found', |
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sprintf( |
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/* translators: %s: Gateway configuration ID */ |
317
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__( 'Could not find client in gateway with ID `%s`.', 'pronamic_ideal' ), |
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$config_id |
319
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), |
320
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$config_id |
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); |
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} |
323
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|
324
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// phpcs:ignore WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase -- Adyen JSON object. |
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if ( ! isset( $data->paymentMethod->type ) ) { |
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return new \WP_Error( |
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'pronamic-pay-adyen-no-payment-method', |
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__( 'No payment method given.', 'pronamic_ideal' ) |
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); |
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} |
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|
332
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// Send additional payment details. |
333
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$payment_details_request = new PaymentDetailsRequest(); |
334
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|
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// Set payment data from original payment response. |
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$payment_response = $payment->get_meta( 'adyen_payment_response' ); |
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|
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if ( is_string( $payment_response ) && '' !== $payment_response ) { |
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$payment_response = \json_decode( $payment_response ); |
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$payment_response = PaymentResponse::from_object( $payment_response ); |
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$payment_data = $payment_response->get_payment_data(); |
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$payment_details_request->set_payment_data( $payment_data ); |
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} |
347
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348
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try { |
349
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if ( ! \is_callable( array( $gateway, 'send_payment_details' ) ) ) { |
350
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return (object) array( |
351
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'error' => __( 'Gateway does not support sending additional payment details.', 'pronamic_ideal' ), |
352
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); |
353
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} |
354
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|
355
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try { |
356
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$response = $gateway->send_payment_details( $payment_details_request ); |
357
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} catch ( \Pronamic\WordPress\Pay\Gateways\Adyen\ServiceException $service_exception ) { |
358
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$message = $service_exception->getMessage(); |
359
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|
360
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$error_code = $service_exception->get_error_code(); |
361
|
|
|
|
362
|
|
|
if ( ! empty( $error_code ) ) { |
363
|
|
|
$message = sprintf( |
364
|
|
|
/* translators: 1: error message, 2: error code */ |
365
|
|
|
__( '%1$s (error %2$s)', 'pronamic_ideal' ), |
366
|
|
|
$service_exception->getMessage(), |
367
|
|
|
$error_code |
368
|
|
|
); |
369
|
|
|
} |
370
|
|
|
|
371
|
|
|
throw new \Exception( $message ); |
372
|
|
|
} |
373
|
|
|
|
374
|
|
|
// Update payment status based on response. |
375
|
|
|
PaymentResponseHelper::update_payment( $payment, $response ); |
376
|
|
|
} catch ( \Exception $e ) { |
377
|
|
|
$error = $e->getMessage(); |
378
|
|
|
|
379
|
|
|
$error_code = $e->getCode(); |
380
|
|
|
|
381
|
|
|
if ( ! empty( $error_code ) ) { |
382
|
|
|
$error = sprintf( '%s - %s', $error_code, $e->getMessage() ); |
383
|
|
|
} |
384
|
|
|
|
385
|
|
|
return (object) array( 'error' => $error ); |
386
|
|
|
} |
387
|
|
|
|
388
|
|
|
$result = array( |
389
|
|
|
'resultCode' => $response->get_result_code(), |
390
|
|
|
); |
391
|
|
|
|
392
|
|
|
// Return action if available. |
393
|
|
|
$action = $response->get_action(); |
394
|
|
|
|
395
|
|
|
if ( null !== $action ) { |
396
|
|
|
$result['action'] = $action->get_json(); |
397
|
|
|
} |
398
|
|
|
|
399
|
|
|
// Return refusal reason if available. |
400
|
|
|
$refusal_reason = $response->get_refusal_reason(); |
401
|
|
|
|
402
|
|
|
if ( null !== $refusal_reason ) { |
403
|
|
|
$result['refusalReason'] = $refusal_reason; |
404
|
|
|
} |
405
|
|
|
|
406
|
|
|
return (object) $result; |
407
|
|
|
} |
408
|
|
|
|
409
|
|
|
/** |
410
|
|
|
* REST API Apple Pay merchant validation handler. |
411
|
|
|
* |
412
|
|
|
* @param WP_REST_Request $request Request. |
413
|
|
|
* @return object |
414
|
|
|
* @throws \Exception Throws exception on merchant identity files problems. |
415
|
|
|
*/ |
416
|
|
|
public function rest_api_applepay_merchant_validation( WP_REST_Request $request ) { |
417
|
|
|
$payment_id = $request->get_param( 'payment_id' ); |
418
|
|
|
|
419
|
|
|
// Payment ID. |
420
|
|
|
if ( null === $payment_id ) { |
421
|
|
|
return new \WP_Error( |
422
|
|
|
'pronamic-pay-adyen-no-payment-id', |
423
|
|
|
__( 'No payment ID given in `payment_id` parameter.', 'pronamic_ideal' ) |
424
|
|
|
); |
425
|
|
|
} |
426
|
|
|
|
427
|
|
|
$payment = \get_pronamic_payment( $payment_id ); |
428
|
|
|
|
429
|
|
|
if ( null === $payment ) { |
430
|
|
|
return new \WP_Error( |
431
|
|
|
'pronamic-pay-adyen-payment-not-found', |
432
|
|
|
sprintf( |
433
|
|
|
/* translators: %s: payment ID */ |
434
|
|
|
__( 'Could not find payment with ID `%s`.', 'pronamic_ideal' ), |
435
|
|
|
$payment_id |
436
|
|
|
), |
437
|
|
|
$payment_id |
438
|
|
|
); |
439
|
|
|
} |
440
|
|
|
|
441
|
|
|
// State data. |
442
|
|
|
$data = \json_decode( $request->get_body() ); |
443
|
|
|
|
444
|
|
|
if ( null === $data ) { |
445
|
|
|
return new \WP_Error( |
446
|
|
|
'pronamic-pay-adyen-no-data', |
447
|
|
|
__( 'No data given in request body.', 'pronamic_ideal' ) |
448
|
|
|
); |
449
|
|
|
} |
450
|
|
|
|
451
|
|
|
// Gateway. |
452
|
|
|
$config_id = $payment->get_config_id(); |
453
|
|
|
|
454
|
|
|
if ( null === $config_id ) { |
455
|
|
|
return new \WP_Error( |
456
|
|
|
'pronamic-pay-adyen-no-config', |
457
|
|
|
__( 'No gateway configuration ID given in payment.', 'pronamic_ideal' ) |
458
|
|
|
); |
459
|
|
|
} |
460
|
|
|
|
461
|
|
|
$gateway = Plugin::get_gateway( $config_id ); |
462
|
|
|
|
463
|
|
|
if ( empty( $gateway ) ) { |
464
|
|
|
return new \WP_Error( |
465
|
|
|
'pronamic-pay-adyen-gateway-not-found', |
466
|
|
|
sprintf( |
467
|
|
|
/* translators: %s: Gateway configuration ID */ |
468
|
|
|
__( 'Could not find gateway with ID `%s`.', 'pronamic_ideal' ), |
469
|
|
|
$config_id |
470
|
|
|
), |
471
|
|
|
$config_id |
472
|
|
|
); |
473
|
|
|
} |
474
|
|
|
|
475
|
|
|
if ( ! isset( $gateway->client ) ) { |
476
|
|
|
return new \WP_Error( |
477
|
|
|
'pronamic-pay-adyen-client-not-found', |
478
|
|
|
sprintf( |
479
|
|
|
/* translators: %s: Gateway configuration ID */ |
480
|
|
|
__( 'Could not find client in gateway with ID `%s`.', 'pronamic_ideal' ), |
481
|
|
|
$config_id |
482
|
|
|
), |
483
|
|
|
$config_id |
484
|
|
|
); |
485
|
|
|
} |
486
|
|
|
|
487
|
|
|
// Merchant identifier. |
488
|
|
|
$integration = new Integration(); |
489
|
|
|
|
490
|
|
|
$config = $integration->get_config( $config_id ); |
491
|
|
|
|
492
|
|
|
$merchant_identifier = $config->get_apple_pay_merchant_id(); |
493
|
|
|
|
494
|
|
|
if ( empty( $merchant_identifier ) ) { |
495
|
|
|
return new \WP_Error( |
496
|
|
|
'pronamic-pay-adyen-applepay-no-merchant-identifier', |
497
|
|
|
__( 'Apple Pay merchant identifier not configured in gateway settings.', 'pronamic_ideal' ) |
498
|
|
|
); |
499
|
|
|
} |
500
|
|
|
|
501
|
|
|
if ( ! isset( $data->validation_url ) ) { |
502
|
|
|
return new \WP_Error( |
503
|
|
|
'pronamic-pay-adyen-applepay-no-validation-url', |
504
|
|
|
__( 'No Apple Pay merchant validation URL given.', 'pronamic_ideal' ) |
505
|
|
|
); |
506
|
|
|
} |
507
|
|
|
|
508
|
|
|
/* |
509
|
|
|
* Request an Apple Pay payment session. |
510
|
|
|
* |
511
|
|
|
* @link https://developer.apple.com/documentation/apple_pay_on_the_web/applepaysession/1778021-onvalidatemerchant |
512
|
|
|
* @link https://developer.apple.com/documentation/apple_pay_on_the_web/apple_pay_js_api/requesting_an_apple_pay_payment_session |
513
|
|
|
* @link https://docs.adyen.com/payment-methods/apple-pay/web-drop-in#show-apple-pay-in-your-payment-form |
514
|
|
|
*/ |
515
|
|
|
$request = array( |
516
|
|
|
'merchantIdentifier' => $merchant_identifier, |
517
|
|
|
'displayName' => \get_bloginfo( 'name' ), |
518
|
|
|
'initiative' => 'web', |
519
|
|
|
'initiativeContext' => Server::get( 'HTTP_HOST', FILTER_SANITIZE_STRING ), |
520
|
|
|
); |
521
|
|
|
|
522
|
|
|
try { |
523
|
|
|
add_action( 'http_api_curl', array( $this, 'http_curl_applepay_merchant_identity' ), 10, 3 ); |
524
|
|
|
|
525
|
|
|
$certificate = $config->get_apple_pay_merchant_id_certificate(); |
526
|
|
|
$private_key = $config->get_apple_pay_merchant_id_private_key(); |
527
|
|
|
|
528
|
|
|
if ( empty( $certificate ) || empty( $private_key ) ) { |
529
|
|
|
throw new \Exception( __( 'Invalid Apple Pay Merchant Identity configuration.', 'pronamic_ideal' ) ); |
530
|
|
|
} |
531
|
|
|
|
532
|
|
|
// Create temporary files for merchant validation. |
533
|
|
|
$certificate_file = \tmpfile(); |
534
|
|
|
$private_key_file = \tmpfile(); |
535
|
|
|
|
536
|
|
|
if ( false === $certificate_file || false === $private_key_file ) { |
537
|
|
|
throw new \Exception( __( 'Error creating merchant identity files.', 'pronamic_ideal' ) ); |
538
|
|
|
} |
539
|
|
|
|
540
|
|
|
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_read_fwrite -- Temporary files. |
541
|
|
|
\fwrite( $certificate_file, $certificate ); |
542
|
|
|
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_read_fwrite -- Temporary files. |
543
|
|
|
\fwrite( $private_key_file, $private_key ); |
544
|
|
|
|
545
|
|
|
// Validate merchant. |
546
|
|
|
$response = \wp_remote_request( |
547
|
|
|
$data->validation_url, |
548
|
|
|
array( |
549
|
|
|
'method' => 'POST', |
550
|
|
|
'headers' => array( |
551
|
|
|
'Content-Type' => 'application/json', |
552
|
|
|
), |
553
|
|
|
'body' => \wp_json_encode( (object) $request ), |
554
|
|
|
'adyen_applepay_merchant_identity' => array( |
555
|
|
|
'certificate_path' => stream_get_meta_data( $certificate_file )['uri'], |
556
|
|
|
'private_key_path' => stream_get_meta_data( $private_key_file )['uri'], |
557
|
|
|
'private_key_password' => $config->get_apple_pay_merchant_id_private_key_password(), |
558
|
|
|
), |
559
|
|
|
) |
560
|
|
|
); |
561
|
|
|
|
562
|
|
|
// Remove temporary files. |
563
|
|
|
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_read_fclose -- Temporary files. |
564
|
|
|
\fclose( $certificate_file ); |
565
|
|
|
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_read_fclose -- Temporary files. |
566
|
|
|
\fclose( $private_key_file ); |
567
|
|
|
|
568
|
|
|
$body = \wp_remote_retrieve_body( $response ); |
569
|
|
|
|
570
|
|
|
$result = \json_decode( $body ); |
571
|
|
|
} catch ( \Exception $e ) { |
572
|
|
|
$error = $e->getMessage(); |
573
|
|
|
|
574
|
|
|
$error_code = $e->getCode(); |
575
|
|
|
|
576
|
|
|
if ( ! empty( $error_code ) ) { |
577
|
|
|
$error = sprintf( '%s - %s', $error_code, $e->getMessage() ); |
578
|
|
|
} |
579
|
|
|
|
580
|
|
|
return (object) array( 'error' => $error ); |
581
|
|
|
} |
582
|
|
|
|
583
|
|
|
return (object) $result; |
584
|
|
|
} |
585
|
|
|
|
586
|
|
|
/** |
587
|
|
|
* HTTP CURL options for Apple Pay merchant validation. |
588
|
|
|
* |
589
|
|
|
* @param resource $handle CURL handle. |
590
|
|
|
* @param array<array<string>> $parsed_args Parsed arguments. |
591
|
|
|
* @param string $url Request URL. |
592
|
|
|
* @return void |
593
|
|
|
* @throws \Exception Throws exception on error while reading temporary files. |
594
|
|
|
*/ |
595
|
|
|
public function http_curl_applepay_merchant_identity( $handle, $parsed_args, $url ) { |
|
|
|
|
596
|
|
|
if ( ! isset( $parsed_args['adyen_applepay_merchant_identity'] ) ) { |
597
|
|
|
return; |
598
|
|
|
} |
599
|
|
|
|
600
|
|
|
$merchant_identity = $parsed_args['adyen_applepay_merchant_identity']; |
601
|
|
|
|
602
|
|
|
$certificate_path = $merchant_identity['certificate_path']; |
603
|
|
|
$private_key_path = $merchant_identity['private_key_path']; |
604
|
|
|
$private_key_password = $merchant_identity['private_key_password']; |
605
|
|
|
|
606
|
|
|
// Check temporary files existence. |
607
|
|
|
if ( ! \is_readable( $certificate_path ) || ! \is_readable( $private_key_path ) ) { |
608
|
|
|
throw new \Exception( __( 'Error reading merchant identity files.', 'pronamic_ideal' ) ); |
609
|
|
|
} |
610
|
|
|
|
611
|
|
|
// Set merchant identity certificate and private key SSL options. |
612
|
|
|
// phpcs:disable WordPress.WP.AlternativeFunctions.curl_curl_setopt |
613
|
|
|
\curl_setopt( $handle, CURLOPT_SSLCERT, $certificate_path ); |
614
|
|
|
\curl_setopt( $handle, CURLOPT_SSLKEY, $private_key_path ); |
615
|
|
|
|
616
|
|
|
// Set merchant identity private key password. |
617
|
|
|
if ( ! empty( $private_key_password ) ) { |
618
|
|
|
\curl_setopt( $handle, CURLOPT_SSLKEYPASSWD, $private_key_password ); |
619
|
|
|
} |
620
|
|
|
|
621
|
|
|
// phpcs:enable WordPress.WP.AlternativeFunctions.curl_curl_setopt |
622
|
|
|
} |
623
|
|
|
} |
624
|
|
|
|
This check looks for function or method calls that always return null and whose return value is assigned to a variable.
The method
getObject()
can return nothing but null, so it makes no sense to assign that value to a variable.The reason is most likely that a function or method is imcomplete or has been reduced for debug purposes.