first commit

wp/wp-content/plugins/wordpress-seo/src/routes/supported-features-route.php

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+<?php
+
+namespace Yoast\WP\SEO\Routes;
+
+use WP_REST_Response;
+use Yoast\WP\SEO\Conditionals\Addon_Installation_Conditional;
+use Yoast\WP\SEO\Main;
+
+/**
+ * Supported_Features_Route class.
+ */
+class Supported_Features_Route implements Route_Interface {
+
+	/**
+	 * Represents the supported features route.
+	 *
+	 * @var string
+	 */
+	const SUPPORTED_FEATURES_ROUTE = '/supported-features';
+
+	/**
+	 * Returns the conditionals based in which this loadable should be active.
+	 *
+	 * @return array
+	 */
+	public static function get_conditionals() {
+		return [
+			Addon_Installation_Conditional::class,
+		];
+	}
+
+	/**
+	 * Registers routes with WordPress.
+	 *
+	 * @return void
+	 */
+	public function register_routes() {
+		$supported_features_route = [
+			'methods'             => 'GET',
+			'callback'            => [ $this, 'get_supported_features' ],
+			'permission_callback' => '__return_true',
+		];
+
+		\register_rest_route( Main::API_V1_NAMESPACE, self::SUPPORTED_FEATURES_ROUTE, $supported_features_route );
+	}
+
+	/**
+	 * Returns a list of features supported by this yoast seo installation.
+	 *
+	 * @return WP_REST_Response a list of features supported by this yoast seo installation.
+	 */
+	public function get_supported_features() {
+		return new WP_REST_Response(
+			[
+				'addon-installation' => 1,
+			]
+		);
+	}
+}