Add user flags API endpoint [MAILPOET-1677]

lib/API/JSON/v1/UserFlags.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace MailPoet\API\JSON\v1;
+
+use MailPoet\API\JSON\Endpoint as APIEndpoint;
+use MailPoet\API\JSON\Error as APIError;
+use MailPoet\Config\AccessControl;
+use MailPoet\Services\Bridge;
+use MailPoet\Settings\UserFlags as UserFlagsController;
+use MailPoet\WP\Functions as WPFunctions;
+
+if (!defined('ABSPATH')) exit;
+
+class UserFlags extends APIEndpoint {
+
+  /** @var UserFlagsController */
+  private $user_flags;
+
+  public $permissions = array(
+    'global' => AccessControl::PERMISSION_MANAGE_SETTINGS
+  );
+
+  function __construct(UserFlagsController $user_flags) {
+    $this->user_flags = $user_flags;
+  }
+
+  function set(array $flags = []) {
+    if (empty($flags)) {
+      return $this->badRequest(
+        array(
+          APIError::BAD_REQUEST =>
+            WPFunctions::get()->__('You have not specified any user flags to be saved.', 'mailpoet')
+        ));
+    } else {
+      foreach ($flags as $name => $value) {
+        $this->user_flags->set($name, $value);
+      }
+      return $this->successResponse([]);
+    }
+  }
+}