Moves current API under JSON namespace

lib/API/JSON/Endpoint.php

@@ -0,0 +1,35 @@
+<?php
+namespace MailPoet\API\JSON;
+
+if(!defined('ABSPATH')) exit;
+
+abstract class Endpoint {
+
+  public $permissions = array();
+
+  function successResponse(
+    $data = array(), $meta = array(), $status = Response::STATUS_OK
+  ) {
+    return new SuccessResponse($data, $meta, $status);
+  }
+
+  function errorResponse(
+    $errors = array(), $meta = array(), $status = Response::STATUS_NOT_FOUND
+  ) {
+    if(empty($errors)) {
+      $errors = array(
+        Error::UNKNOWN  => __('An unknown error occurred.', 'mailpoet')
+      );
+    }
+    return new ErrorResponse($errors, $meta, $status);
+  }
+
+  function badRequest($errors = array(), $meta = array()) {
+    if(empty($errors)) {
+      $errors = array(
+        Error::BAD_REQUEST => __('Invalid request parameters', 'mailpoet')
+      );
+    }
+    return new ErrorResponse($errors, $meta, Response::STATUS_BAD_REQUEST);
+  }
+}