Fix(Core): fix file upload (#517)

* Fix(Core): fix file upload

* fix CS

* fix CS

* fix

Author: stonebuzz

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [UNRELEASED]
+
+### Fixed
+
+- Fix file upload
+
+
 ## [2.15.0] - 2025-09-30
 
 ### Added

inc/backend.class.php

@@ -27,7 +27,7 @@
  * @link      https://github.com/pluginsGLPI/datainjection
  * -------------------------------------------------------------------------
  */
-use Glpi\Exception\Http\HttpException;
+
 
 use function Safe\preg_match;
 
@@ -78,12 +78,17 @@ public static function getHeader($injectionData, $header_present)
    **/
     public static function getInstance($type)
     {
+        $allowedBackends = [
+            'csv' => PluginDatainjectionBackendcsv::class,
+        ];
 
-        $class = 'PluginDatainjectionBackend' . $type;
-        if (!is_a($class, CommonDBTM::class, true)) {
-            throw new HttpException(500, 'Class ' . $class . ' is not a valid class');
+        if (!isset($allowedBackends[$type])) {
+            throw new InvalidArgumentException("Unknown backend type: $type");
         }
-        return new $class();
+
+        return new $allowedBackends[$type]();
+
+
     }