[Monetize] Local checkout page

projects/plugins/jetpack/changelog/Add Monetize Checkout plugin

@@ -0,0 +1,4 @@
+Significance: minor
+Type: other
+
+Add Monetize Checkout plugin

projects/plugins/jetpack/extensions/shared/memberships.js

@@ -6,7 +6,7 @@ let premiumContentJWTTokenForCookie = '';
  * @listens window#message
  */
 export function handleIframeResult( eventFromIframe ) {
-	if ( eventFromIframe.origin === 'https://subscribe.wordpress.com' && eventFromIframe.data ) {
+	if ( eventFromIframe.data ) {
 		let data = eventFromIframe.data;
 		if ( typeof data === 'string' ) {
 			try {

projects/plugins/jetpack/modules/memberships/class-jetpack-memberships.php

@@ -19,6 +19,7 @@
 }
 
 require_once __DIR__ . '/../../extensions/blocks/subscriptions/constants.php';
+require_once __DIR__ . '/class-jetpack-monetize-checkout.php';
 
 /**
  * Class Jetpack_Memberships
@@ -566,7 +567,7 @@ public function get_subscription_url( $plan_id ) {
 				'pid'      => esc_attr( get_the_ID() ), // Needed for analytics purposes.
 				'redirect' => esc_attr( rawurlencode( home_url( $wp->request ) ) ), // Needed for redirect back in case of redirect-based flow.
 			),
-			'https://subscribe.wordpress.com/memberships/'
+			Jetpack_Monetize_Checkout::init()->get_page_monetize_checkout_link()
 		);
 	}
 

projects/plugins/jetpack/modules/memberships/class-jetpack-monetize-checkout.php

@@ -0,0 +1,221 @@
+<?php
+/**
+ * Module Name: Monetize Checkout
+ * Module Description: Creates and manages the monetize checkout page for membership subscriptions.
+ * Sort Order: 23
+ * First Introduced: 14.0
+ * Requires Connection: Yes
+ * Auto Activate: Yes
+ * Module Tags: Monetization
+ * Additional Search Queries: checkout, monetize, membership, payment
+ * Requires Dependencies: subscriptions
+ *
+ * @package automattic/jetpack
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+/**
+ * Monetize_Checkout class
+ * Manages the monetize checkout page creation and maintenance.
+ */
+class Jetpack_Monetize_Checkout {
+
+	/**
+	 * Page meta key identifier
+	 */
+	const META_KEY = 'jp_mem_checkout';
+
+	/**
+	 * Base slug for the checkout page
+	 */
+	const BASE_SLUG = 'monetize-checkout';
+
+	/**
+	 * Singleton instance
+	 *
+	 * @var Jetpack_Monetize_Checkout
+	 */
+	private static $instance = null;
+
+	/**
+	 * Get singleton instance
+	 *
+	 * @return Jetpack_Monetize_Checkout
+	 */
+	public static function init() {
+
+		if ( null === self::$instance ) {
+			self::$instance = new self();
+		}
+		return self::$instance;
+	}
+
+	/**
+	 * Constructor
+	 */
+	private function __construct() {
+		// Only activate if subscriptions module is active
+		if ( ! $this->is_subscriptions_active() ) {
+			return;
+		}
+
+		// Check and create page on init
+		add_action( 'init', array( $this, 'ensure_checkout_page_exists' ) );
+		add_action( 'init', array( $this, 'maybe_set_checkout_content' ) );
+	}
+
+	public function maybe_set_checkout_content() {
+		$checkout_page = $this->find_checkout_page();
+		if ( is_page( $checkout_page->ID ) ) {
+			// Disable search engines from indexing the checkout page
+			add_filter( 'wp_head', array( $this, 'empty_content' ), 1, PHP_INT_MAX );
+			add_filter( 'wp_footer', array( $this, 'empty_content' ), 1, PHP_INT_MAX );
+			add_filter( 'the_content', array( $this, 'return_checkout_content' ), 1, PHP_INT_MAX );
+		}
+	}
+
+	/**
+	 * Returns empty content for header/footer
+	 */
+	public function empty_content( $content ) {
+		return '';
+	}
+
+	/**
+	 * Returns custom content for the checkout page
+	 */
+	public function return_checkout_content( $content ) {
+		// This is where we should retrieve the data from subscribe.wordpress.com
+		return 'Some content from subscribe.wordpress.com';
+	}
+
+	/**
+	 * Get the URL of the monetize checkout page
+	 *
+	 * @return string
+	 */
+	public function get_page_monetize_checkout_link() {
+		$this->ensure_checkout_page_exists();
+
+		$page = $this->find_checkout_page();
+
+		return get_page_link( $page );
+	}
+
+	/**
+	 * Check if subscriptions module is active
+	 *
+	 * @return bool
+	 */
+	private function is_subscriptions_active() {
+		if ( ! class_exists( 'Jetpack' ) ) {
+			return false;
+		}
+		return Jetpack::is_module_active( 'subscriptions' );
+	}
+	/**
+	 * Find existing checkout page by meta key
+	 *
+	 * @return WP_Post|null
+	 */
+	private function find_checkout_page() {
+		$pages = get_posts(
+			array(
+				'post_type'      => 'page',
+				'post_status'    => array( 'publish', 'draft', 'pending', 'private' ),
+				'posts_per_page' => 1,
+				'meta_key'       => self::META_KEY,
+				'meta_value'     => '1',
+			)
+		);
+
+		return ! empty( $pages ) ? $pages[0] : null;
+	}
+
+	/**
+	 * Generate a unique slug for the checkout page
+	 *
+	 * @return string
+	 */
+	private function generate_unique_slug() {
+		$slug    = self::BASE_SLUG;
+		$counter = 0;
+
+		// Check if base slug is available
+		if ( ! $this->slug_exists( $slug ) ) {
+			return $slug;
+		}
+
+		// Try numbered variants
+		do {
+			++$counter;
+			$slug = self::BASE_SLUG . '-' . $counter;
+		} while ( $this->slug_exists( $slug ) );
+
+		return $slug;
+	}
+
+	/**
+	 * Check if a slug exists in the database
+	 *
+	 * @param string $slug The slug to check.
+	 * @return bool
+	 */
+	private function slug_exists( $slug ) {
+		global $wpdb;
+
+		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
+		$count = $wpdb->get_var(
+			$wpdb->prepare(
+				"SELECT COUNT(*) FROM $wpdb->posts WHERE post_name = %s AND post_status != 'trash'",
+				$slug
+			)
+		);
+		return $count > 0;
+	}
+
+	/**
+	 * Create the checkout page
+	 *
+	 * @return int|WP_Error Post ID on success, WP_Error on failure
+	 */
+	private function create_checkout_page() {
+		$slug = $this->generate_unique_slug();
+
+		$page_data = array(
+			'post_title'   => __( 'Monetize Checkout', 'jetpack' ),
+			'post_content' => '',
+			'post_status'  => 'publish',
+			'post_type'    => 'page',
+			'post_name'    => $slug,
+		);
+
+		$page_id = wp_insert_post( $page_data );
+
+		if ( is_wp_error( $page_id ) ) {
+			return $page_id;
+		}
+
+		// Add the meta key to identify this page
+		update_post_meta( $page_id, self::META_KEY, '1' );
+
+		return $page_id;
+	}
+
+	/**
+	 * Ensure the checkout page exists, create if necessary
+	 */
+	public function ensure_checkout_page_exists() {
+		$existing_page = $this->find_checkout_page();
+
+		if ( null === $existing_page ) {
+			$this->create_checkout_page();
+		}
+	}
+}
+
+// Initialize the module
+Jetpack_Monetize_Checkout::init();