Server side payment method registration

src/BlockTypes/Cart.php

@@ -64,10 +64,12 @@ public function render( $attributes = array(), $content = '' ) {
 		if ( ! $data_registry->exists( 'cartData' ) ) {
 			$data_registry->add( 'cartData', WC()->api->get_endpoint_data( '/wc/store/cart' ) );
 		}
+		do_action( 'woocommerce_blocks_enqueue_cart_block_scripts_before' );
 		\Automattic\WooCommerce\Blocks\Assets::register_block_script(
 			$this->block_name . '-frontend',
 			$this->block_name . '-block-frontend'
 		);
+		do_action( 'woocommerce_blocks_enqueue_cart_block_scripts_after' );
 		return $content . $this->get_skeleton();
 	}
 

src/BlockTypes/Checkout.php

@@ -75,7 +75,10 @@ public function render( $attributes = array(), $content = '' ) {
 		if ( ! $data_registry->exists( 'defaultAddressFields' ) ) {
 			$data_registry->add( 'defaultAddressFields', WC()->countries->get_default_address_fields() );
 		}
+		do_action( 'woocommerce_blocks_enqueue_checkout_block_scripts_before' );
 		\Automattic\WooCommerce\Blocks\Assets::register_block_script( $this->block_name . '-frontend', $this->block_name . '-block-frontend' );
+		do_action( 'woocommerce_blocks_enqueue_checkout_block_scripts_after' );
+
 		return $content;
 	}
 }

src/Domain/Bootstrap.php

@@ -14,6 +14,7 @@
 use Automattic\WooCommerce\Blocks\Library;
 use Automattic\WooCommerce\Blocks\Registry\Container;
 use Automattic\WooCommerce\Blocks\RestApi;
+use Automattic\WooCommerce\Blocks\PaymentMethodIntegrations\Stripe;
 
 /**
  * Takes care of bootstrapping the plugin.
@@ -89,6 +90,10 @@ function( Container $container ) {
 		// load AssetDataRegistry.
 		$this->container->get( AssetDataRegistry::class );
 
+		// @todo this will eventually get moved into the relevant payment
+		// extensions
+		$this->load_payment_method_integrations();
+
 		Library::init();
 		OldAssets::init();
 		RestApi::init();
@@ -163,4 +168,31 @@ protected function define_feature_flag() {
 		}
 		define( 'WOOCOMMERCE_BLOCKS_PHASE', $flag );
 	}
+
+	/**
+	 * This is a temporary method that is used for setting up payment method
+	 * integrations with Cart and Checkout blocks. This logic should get moved
+	 * to the payment gateway extensions.
+	 */
+	protected function load_payment_method_integrations() {
+		// stripe registration.
+		$this->container->register(
+			Stripe::class,
+			function( Container $container ) {
+				$asset_data_registry = $container->get( AssetDataRegistry::class );
+				return new Stripe( $asset_data_registry );
+			}
+		);
+		add_action(
+			'plugins_loaded',
+			function() {
+				if ( class_exists( 'WC_Stripe' ) ) {
+					// initialize hooking into blocks.
+					$stripe = $this->container->get( Stripe::class );
+					$stripe->register_assets();
+				}
+			},
+			15
+		);
+	}
 }

src/PaymentMethodIntegrations/Stripe.php

@@ -0,0 +1,157 @@
+<?php
+/**
+ * Temporary integration of the stripe payment method for the new cart and
+ * checkout blocks. Once the api is demonstrated to be stable, this integration
+ * will be moved to the Stripe extension
+ *
+ * @package WooCommerce/Blocks
+ * @since $VID:$
+ */
+
+namespace Automattic\WooCommerce\Blocks\PaymentMethodIntegrations;
+
+use Exception;
+use WC_Stripe_Payment_Request;
+use WC_Stripe_Helper;
+use Automattic\WooCommerce\Blocks\Assets\Api;
+use Automattic\WooCommerce\Blocks\Assets\AssetDataRegistry;
+
+/**
+ * Stripe payment method integration
+ *
+ * @since $VID:$
+ */
+class Stripe {
+
+	/**
+	 * An instance of the AssetDataRegistry
+	 *
+	 * @var AssetDataRegistry
+	 */
+	private $asset_registry;
+
+	/**
+	 * Stripe settings from the WP options table
+	 *
+	 * @var array
+	 */
+	private $stripe_settings;
+
+	/**
+	 * Constructor for the class
+	 *
+	 * @param   AssetDataRegistry $asset_registry  Used for registering data
+	 * to pass along to the request.
+	 */
+	public function __construct( AssetDataRegistry $asset_registry ) {
+		$this->asset_registry  = $asset_registry;
+		$this->stripe_settings = get_option( 'woocommerce_stripe_settings', [] );
+	}
+
+	/**
+	 * When called registers the stripe handle for enqueueing with cart and
+	 * checkout blocks.
+	 * Note: this assumes the stripe extension has registered this script.
+	 * This will also ensure stripe data is loaded with the blocks.
+	 */
+	public function register_assets() {
+		add_action( 'woocommerce_blocks_enqueue_checkout_block_scripts_before', [ $this, 'enqueue_stripe_and_data' ] );
+		add_action( 'woocommerce_blocks_enqueue_cart_block_scripts_before', [ $this, 'enqueue_stripe_and_data' ] );
+	}
+
+	/**
+	 * When called, registers a stripe data object (with 'stripe_data' as the
+	 * key) for including everywhere stripe integration happens.
+	 */
+	public function enqueue_data() {
+		$data = [
+			'stripeTotalLabel' => $this->get_total_label(),
+			'publicKey'        => $this->get_publishable_key(),
+			'allowPrepaidCard' => $this->get_allow_prepaid_card(),
+			'button'           => [
+				'type'   => $this->get_button_type(),
+				'theme'  => $this->get_button_theme(),
+				'height' => $this->get_button_height(),
+				'locale' => $this->get_button_locale(),
+			],
+		];
+		if ( ! $this->asset_registry->exists( 'stripe_data' ) ) {
+			$this->asset_registry->add( 'stripe_data', $data );
+		}
+	}
+
+	/**
+	 * Callback hooked into cart and checkout block script enqueue action.
+	 */
+	public function enqueue_stripe_and_data() {
+		wp_enqueue_script( 'stripe', 'https://js.stripe.com/v3/', '', '3.0', true );
+		$this->enqueue_data();
+	}
+
+	/**
+	 * Returns the label to use accompanying the total in the stripe statement.
+	 *
+	 * @return  string  Statement descriptor
+	 */
+	private function get_total_label() {
+		return ! empty( $this->stripe_settings['statement_descriptor'] ) ? WC_Stripe_Helper::clean_statement_descriptor( $this->stripe_settings['statement_descriptor'] ) : '';
+	}
+
+	/**
+	 * Returns the publishable api key for the Stripe service.
+	 *
+	 * @return  string  Public api key.
+	 */
+	private function get_publishable_key() {
+		$test_mode = ( ! empty( $this->stripe_settings['testmode'] ) && 'yes' === $this->stripe_settings['testmode'] );
+		if ( $test_mode ) {
+			return ! empty( $this->stripe_settings['test_publishable_key'] ) ? $this->stripe_settings['test_publishable_key'] : '';
+		}
+		return ! empty( $this->stripe_settings['publishable_key'] ) ? $this->stripe_settings['publishable_key'] : '';
+	}
+
+	/**
+	 * Returns whether to allow prepaid cards for payments.
+	 *
+	 * @return  bool  True means to allow prepaid card (default)
+	 */
+	private function get_allow_prepaid_card() {
+		return apply_filters( 'wc_stripe_allow_prepaid_card', true );
+	}
+
+	/**
+	 * Return the button type for the payment button.
+	 *
+	 * @return  string  Defaults to 'default'
+	 */
+	private function get_button_type() {
+		return isset( $this->stripe_settings['payment_request_button_type'] ) ? $this->stripe_settings['payment_request_button_type'] : 'default';
+	}
+
+	/**
+	 * Return the theme to use for the payment button.
+	 *
+	 * @return  string  Defaults to 'dark'.
+	 */
+	private function get_button_theme() {
+		return isset( $this->stripe_settings['payment_request_button_theme'] ) ? $this->stripe_settings['payment_request_button_theme'] : 'dark';
+	}
+
+	/**
+	 * Return the height for the payment button.
+	 *
+	 * @return  string  A pixel value for the hight (defaults to '64')
+	 */
+	private function get_button_height() {
+		return isset( $this->stripe_settings['payment_request_button_height'] ) ? str_replace( 'px', '', $this->stripe_settings['payment_request_button_height'] ) : '64';
+	}
+
+	/**
+	 * Return the locale for the payment button.
+	 *
+	 * @return  string  Defaults to en_US.
+	 */
+	private function get_button_locale() {
+		return apply_filters( 'wc_stripe_payment_request_button_locale', substr( get_locale(), 0, 2 ) );
+	}
+}