From df554cd79dcfd7f62951f9919fcbf59fe712eef7 Mon Sep 17 00:00:00 2001
From: Pierre du Plessis <pierre@pcservice.co.za>
Date: Tue, 19 May 2020 10:49:18 +0200
Subject: [PATCH] Use Mime component to determine mime type for file validator

---
 .../Component/Validator/Constraints/FileValidator.php     | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/Symfony/Component/Validator/Constraints/FileValidator.php b/src/Symfony/Component/Validator/Constraints/FileValidator.php
index 52e937944188b..b148a52b7e6ac 100644
--- a/src/Symfony/Component/Validator/Constraints/FileValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/FileValidator.php
@@ -13,8 +13,10 @@
 
 use Symfony\Component\HttpFoundation\File\File as FileObject;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
+use Symfony\Component\Mime\MimeTypes;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\LogicException;
 use Symfony\Component\Validator\Exception\UnexpectedTypeException;
 use Symfony\Component\Validator\Exception\UnexpectedValueException;
 
@@ -170,12 +172,12 @@ public function validate($value, Constraint $constraint)
         }
 
         if ($constraint->mimeTypes) {
-            if (!$value instanceof FileObject) {
-                $value = new FileObject($value);
+            if (!class_exists(MimeTypes::class)) {
+                throw new LogicException('Validating mime types requires the "Mime" component. Install "symfony/mime" to use it.');
             }
 
             $mimeTypes = (array) $constraint->mimeTypes;
-            $mime = $value->getMimeType();
+            $mime = MimeTypes::getDefault()->guessMimeType($path);
 
             foreach ($mimeTypes as $mimeType) {
                 if ($mimeType === $mime) {