Add REST API JSON request/response handler

includes/api/class-wc-api-json-handler.php

@@ -0,0 +1,73 @@
+<?php
+/**
+ * WooCommerce API
+ *
+ * Handles parsing JSON request bodies and generating JSON responses
+ *
+ * @author      WooThemes
+ * @category    API
+ * @package     WooCommerce/API
+ * @since       2.1
+ */
+
+if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly
+
+class WC_API_JSON_Handler implements WC_API_Handler {
+
+	/**
+	 * Get the content type for the response
+	 *
+	 * @since 2.1
+	 * @return string
+	 */
+	public function get_content_type() {
+
+		return 'application/json; charset=' . get_option( 'blog_charset' );
+	}
+
+	/**
+	 * Parse the raw request body entity
+	 *
+	 * @since 2.1
+	 * @param string $body the raw request body
+	 * @return array|mixed
+	 */
+	public function parse_body( $body ) {
+
+		return json_decode( $body, true );
+	}
+
+	/**
+	 * Generate a JSON response given an array of data
+	 *
+	 * @since 2.1
+	 * @param array $data the response data
+	 * @return string
+	 */
+	public function generate_response( $data ) {
+
+		if ( isset( $_GET['_jsonp'] ) ) {
+
+			// JSONP enabled by default
+			if ( ! apply_filters( 'woocommerce_api_jsonp_enabled', true ) ) {
+
+				WC()->api->server->send_status( 400 );
+
+				$data = array( array( 'code' => 'woocommerce_api_jsonp_disabled', 'message' => __( 'JSONP support is disabled on this site', 'woocommerce' ) ) );
+			}
+
+			// Check for invalid characters (only alphanumeric allowed)
+			if ( preg_match( '/\W/', $_GET['_jsonp'] ) ) {
+
+				WC()->api->server->send_status( 400 );
+
+				$data = array( array( 'code' => 'woocommerce_api_json_callback_invalid', __( 'The JSONP callback function is invalid', 'woocommerce' ) ) );;
+			}
+
+			return $_GET['_jsonp'] . '(' . json_encode( $data ) . ')';
+		}
+
+		return json_encode( $data );
+	}
+
+}