add REST routes for customers, handler for single customer (https://github.com/woocommerce/woocommerce-admin/pull/3174)

* add REST routes for customers, handler for single customer

* use customer id vs user_id, add collection link

plugins/woocommerce-admin/src/API/Customers.php

@@ -26,6 +26,45 @@ class Customers extends \Automattic\WooCommerce\Admin\API\Reports\Customers\Cont
 	 */
 	protected $rest_base = 'customers';
 
+	/**
+	 * Register the routes for customers.
+	 */
+	public function register_routes() {
+		register_rest_route(
+			$this->namespace,
+			'/' . $this->rest_base,
+			array(
+				array(
+					'methods'             => \WP_REST_Server::READABLE,
+					'callback'            => array( $this, 'get_items' ),
+					'permission_callback' => array( $this, 'get_items_permissions_check' ),
+					'args'                => $this->get_collection_params(),
+				),
+				'schema' => array( $this, 'get_public_item_schema' ),
+			)
+		);
+
+		register_rest_route(
+			$this->namespace,
+			'/' . $this->rest_base . '/(?P<id>[\d-]+)',
+			array(
+				'args'   => array(
+					'id' => array(
+						'description' => __( 'Unique ID for the resource.', 'woocommerce-admin' ),
+						'type'        => 'integer',
+					),
+				),
+				array(
+					'methods'             => \WP_REST_Server::READABLE,
+					'callback'            => array( $this, 'get_item' ),
+					'permission_callback' => array( $this, 'get_items_permissions_check' ),
+					'args'                => $this->get_collection_params(),
+				),
+				'schema' => array( $this, 'get_public_item_schema' ),
+			)
+		);
+	}
+
 	/**
 	 * Maps query arguments from the REST request.
 	 *

plugins/woocommerce-admin/src/API/Reports/Customers/Controller.php

@@ -131,6 +131,33 @@ class Controller extends \WC_REST_Reports_Controller implements ExportableInterf
 		return $response;
 	}
 
+
+	/**
+	 * Get one report.
+	 *
+	 * @param WP_REST_Request $request Request data.
+	 * @return array|WP_Error
+	 */
+	public function get_item( $request ) {
+		$query_args              = $this->prepare_reports_query( $request );
+		$query_args['customers'] = array( $request->get_param( 'id' ) );
+		$customers_query         = new Query( $query_args );
+		$report_data             = $customers_query->get_data();
+
+		$data = array();
+
+		foreach ( $report_data->data as $customer_data ) {
+			$item   = $this->prepare_item_for_response( $customer_data, $request );
+			$data[] = $this->prepare_response_for_collection( $item );
+		}
+
+		$response = rest_ensure_response( $data );
+		$response->header( 'X-WP-Total', (int) $report_data->total );
+		$response->header( 'X-WP-TotalPages', (int) $report_data->pages );
+
+		return $response;
+	}
+
 	/**
 	 * Prepare a report object for serialization.
 	 *
@@ -174,8 +201,11 @@ class Controller extends \WC_REST_Reports_Controller implements ExportableInterf
 		}
 
 		return array(
-			'customer' => array(
+			'customer'   => array(
-				'href' => rest_url( sprintf( '/%s/customers/%d', $this->namespace, $object['user_id'] ) ),
+				'href' => rest_url( sprintf( '/%s/customers/%d', $this->namespace, $object['id'] ) ),
+			),
+			'collection' => array(
+				'href' => rest_url( sprintf( '/%s/customers', $this->namespace ) ),
 			),
 		);
 	}