Move plugin files to a subfolder

[MAILPOET-3988]

mailpoet/lib/API/JSON/ErrorResponse.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace MailPoet\API\JSON;
+
+use MailPoet\WP\Functions as WPFunctions;
+
+class ErrorResponse extends Response {
+  public $errors;
+
+  public function __construct(
+    $errors = [],
+    $meta = [],
+    $status = self::STATUS_NOT_FOUND
+  ) {
+    parent::__construct($status, $meta);
+    $this->errors = $this->formatErrors($errors);
+  }
+
+  public function getData() {
+    return (empty($this->errors)) ? null : ['errors' => $this->errors];
+  }
+
+  public function formatErrors($errors = []) {
+    return array_map(function($error, $message) {
+      // sanitize SQL error
+      if (preg_match('/^SQLSTATE/i', $message)) {
+        $message = WPFunctions::get()->__('An unknown error occurred.', 'mailpoet');
+      }
+      return [
+        'error' => $error,
+        'message' => $message,
+      ];
+    }, array_keys($errors), array_values($errors));
+  }
+}