Move plugin files to a subfolder

[MAILPOET-3988]

mailpoet/lib/API/JSON/Response.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace MailPoet\API\JSON;
+
+use MailPoet\WP\Functions as WPFunctions;
+
+abstract class Response {
+  const STATUS_OK = 200;
+  const STATUS_BAD_REQUEST = 400;
+  const STATUS_UNAUTHORIZED = 401;
+  const STATUS_FORBIDDEN = 403;
+  const STATUS_NOT_FOUND = 404;
+  const STATUS_CONFLICT = 409;
+  const STATUS_UNKNOWN = 500;
+
+  public $status;
+  public $meta;
+
+  public function __construct(
+    $status,
+    $meta = []
+  ) {
+    $this->status = $status;
+    $this->meta = $meta;
+  }
+
+  public function send() {
+    WPFunctions::get()->statusHeader($this->status);
+
+    $data = $this->getData();
+    $response = [];
+
+    if (!empty($this->meta)) {
+      $response['meta'] = $this->meta;
+    }
+    if ($data === null) {
+      $data = [];
+    }
+    $response = array_merge($response, $data);
+
+    @header('Content-Type: application/json; charset=' . get_option('blog_charset'));
+    echo WPFunctions::get()->wpJsonEncode($response);
+    die();
+  }
+
+  public abstract function getData();
+}