1 files changed, 94 insertions, 0 deletions
diff --git a/plugins/jetpack/_inc/lib/core-api/wpcom-endpoints/class-wpcom-rest-api-v2-endpoint-resolve-redirect.php b/plugins/jetpack/_inc/lib/core-api/wpcom-endpoints/class-wpcom-rest-api-v2-endpoint-resolve-redirect.php
new file mode 100644
index 00000000..442a2efa
--- /dev/null
+++ b/plugins/jetpack/_inc/lib/core-api/wpcom-endpoints/class-wpcom-rest-api-v2-endpoint-resolve-redirect.php
@@ -0,0 +1,94 @@
+<?php
+/**
+ * REST API endpoint for resolving URL redirects.
+ *
+ * @package Jetpack
+ * @since 8.0.0
+ */
+
+/**
+ * Resolve URL redirects.
+ *
+ * @since 8.0.0
+ */
+class WPCOM_REST_API_V2_Endpoint_Resolve_Redirect extends WP_REST_Controller {
+	/**
+	 * Constructor.
+	 */
+	public function __construct() {
+		$this->namespace = 'wpcom/v2';
+		$this->rest_base = 'resolve-redirect';
+		// This endpoint *does not* need to connect directly to Jetpack sites.
+		add_action( 'rest_api_init', array( $this, 'register_routes' ) );
+	}
+
+	/**
+	 * Register the route.
+	 */
+	public function register_routes() {
+		// GET /sites/<blog_id>/resolve-redirect/<url> - Follow 301/302 redirects on a URL, and return the final destination.
+		register_rest_route(
+			$this->namespace,
+			'/' . $this->rest_base . '/(?P<url>.+)',
+			array(
+				'args'   => array(
+					'url' => array(
+						'description'       => __( 'The URL to check for redirects.', 'jetpack' ),
+						'type'              => 'string',
+						'required'          => 'true',
+						'validate_callback' => 'wp_http_validate_url',
+					),
+				),
+				array(
+					'methods'             => WP_REST_Server::READABLE,
+					'callback'            => array( $this, 'follow_redirect' ),
+					'permission_callback' => 'is_user_logged_in',
+				),
+				'schema' => array( $this, 'get_public_item_schema' ),
+			)
+		);
+	}
+
+	/**
+	 * Follows 301/302 redirect for the passed URL, and returns the final destination.
+	 *
+	 * @param WP_REST_Request $request The REST API request data.
+	 * @return WP_REST_Response The REST API response.
+	 */
+	public function follow_redirect( $request ) {
+		$response = wp_safe_remote_get( $request['url'] );
+		if ( is_wp_error( $response ) ) {
+			return rest_ensure_response( '' );
+		}
+
+		$history = $response['http_response']->get_response_object()->history;
+		if ( ! $history ) {
+			return response_ensure_response( $request['url'] );
+		}
+
+		$location = $history[0]->headers->getValues( 'location' );
+		if ( ! $location ) {
+			return response_ensure_response( $request['url'] );
+		}
+
+		return rest_ensure_response( $location[0] );
+	}
+
+	/**
+	 * Retrieves the comment's schema, conforming to JSON Schema.
+	 *
+	 * @return array
+	 */
+	public function get_item_schema() {
+		$schema = array(
+			'$schema'     => 'http://json-schema.org/draft-04/schema#',
+			'title'       => 'resolve-redirect',
+			'type'        => 'string',
+			'description' => __( 'The final destination of the URL being checked for redirects.', 'jetpack' ),
+		);
+
+		return $schema;
+	}
+}
+
+wpcom_rest_api_v2_load_plugin( 'WPCOM_REST_API_V2_Endpoint_Resolve_Redirect' );