Adds version support to public API

lib/API/Endpoints/v1/Settings.php

@@ -0,0 +1,37 @@
+<?php
+namespace MailPoet\API\Endpoints\v1;
+
+use MailPoet\API\Endpoint as APIEndpoint;
+use MailPoet\API\Error as APIError;
+use MailPoet\Mailer\Mailer as MailerConfig;
+use MailPoet\Models\Setting;
+use MailPoet\Services\Bridge;
+
+if(!defined('ABSPATH')) exit;
+
+class Settings extends APIEndpoint {
+  function get() {
+    return $this->successResponse(Setting::getAll());
+  }
+
+  function set($settings = array()) {
+    if(empty($settings)) {
+      return $this->badRequest(array(
+        APIError::BAD_REQUEST =>
+          __('You have not specified any settings to be saved.', 'mailpoet')
+      ));
+    } else {
+      foreach($settings as $name => $value) {
+        Setting::setValue($name, $value);
+      }
+      if(!empty($settings[MailerConfig::MAILER_CONFIG_SETTING_NAME]['mailpoet_api_key'])
+          && Bridge::isMPSendingServiceEnabled()
+      ) {
+        $bridge = new Bridge();
+        $result = $bridge->checkKey($settings[MailerConfig::MAILER_CONFIG_SETTING_NAME]['mailpoet_api_key']);
+        $bridge->updateSubscriberCount($result);
+      }
+      return $this->successResponse(Setting::getAll());
+    }
+  }
+}