Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/woocommerce/src/Admin/API/Experiments.php

@@ -0,0 +1,85 @@
+<?php
+/**
+ * REST API Experiment Controller
+ *
+ * Handles requests to /experiment
+ */
+
+namespace Automattic\WooCommerce\Admin\API;
+
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * Data controller.
+ *
+ * @extends WC_REST_Data_Controller
+ */
+class Experiments extends \WC_REST_Data_Controller {
+
+	/**
+	 * Endpoint namespace.
+	 *
+	 * @var string
+	 */
+	protected $namespace = 'wc-admin';
+
+	/**
+	 * Route base.
+	 *
+	 * @var string
+	 */
+	protected $rest_base = 'experiments';
+
+	/**
+	 * Register routes.
+	 */
+	public function register_routes() {
+		register_rest_route(
+			$this->namespace,
+			'/' . $this->rest_base . '/assignment',
+			array(
+				array(
+					'methods'             => \WP_REST_Server::READABLE,
+					'callback'            => array( $this, 'get_assignment' ),
+					'permission_callback' => array( $this, 'get_item_permissions_check' ),
+				),
+				'schema' => array( $this, 'get_public_item_schema' ),
+			)
+		);
+	}
+
+
+	/**
+	 * Forward the experiment request to WP.com and return the WP.com response.
+	 *
+	 * @param \WP_REST_Request $request Request data.
+	 *
+	 * @return \WP_Error|\WP_REST_Response
+	 */
+	public function get_assignment( $request ) {
+		$args = $request->get_query_params();
+
+		if ( ! isset( $args['experiment_name'] ) ) {
+			return new \WP_Error(
+				'woocommerce_rest_experiment_name_required',
+				__( 'Sorry, experiment_name is required.', 'woocommerce' ),
+				array( 'status' => 400 )
+			);
+		}
+
+		unset( $args['rest_route'] );
+
+		$abtest   = new \WooCommerce\Admin\Experimental_Abtest(
+			$request->get_param( 'anon_id' ) ?? '',
+			'woocommerce',
+			true, // set consent to true here since frontend has checked it already.
+			true  // set true to send request as auth user.
+		);
+		$response = $abtest->request_assignment( $args );
+		if ( is_wp_error( $response ) ) {
+			return $response;
+		}
+
+		return json_decode( $response['body'], true );
+	}
+}