composer.json

@@ -13,12 +13,14 @@
         "symfony/config": "^5.3",
         "symfony/expression-language": "^5.3",
         "symfony/framework-bundle": "^5.3",
+        "symfony/mime": "^5.3",
         "symfony/security-bundle": "^5.3",
         "symfony/security-core": "^5.3",
         "symfony/security-guard": "^5.3",
         "symfony/twig-bundle": "^5.3",
         "symfony/validator": "^5.3",
         "symfony/yaml": "^5.3",
+        "ext-fileinfo": "*",
         "ext-json": "*"
     },
     "require-dev": {

src/Helpers/MimeTools.php

+<?php
+
+declare(strict_types=1);
+
+namespace Dbp\Relay\CoreBundle\Helpers;
+
+use Symfony\Component\Mime\MimeTypes;
+
+class MimeTools
+{
+    /**
+     * Convert binary data to a data url.
+     */
+    public static function getDataURI(string $data, string $mime): string
+    {
+        return 'data:'.$mime.';base64,'.base64_encode($data);
+    }
+
+    public static function getMimeType(string $data): string
+    {
+        $info = finfo_open();
+
+        return finfo_buffer($info, $data, FILEINFO_MIME_TYPE);
+    }
+
+    public static function getFileExtensionForMimeType(string $mimeType): string
+    {
+        $mimeTypes = new MimeTypes();
+        $extensions = $mimeTypes->getExtensions($mimeType);
+
+        return $extensions[0] ?? 'dump';
+    }
+}