From 1bcb50edc335886dd722a4c69960c48cc3cd1687 Mon Sep 17 00:00:00 2001
From: Elias Schneider <login@eliasschneider.com>
Date: Tue, 10 Jun 2025 10:51:46 +0200
Subject: [PATCH] fix: allow images with uppercase file extension

---
 backend/internal/service/app_config_service.go | 2 +-
 backend/internal/service/oidc_service.go       | 2 +-
 backend/internal/utils/file_util.go            | 5 ++---
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/backend/internal/service/app_config_service.go b/backend/internal/service/app_config_service.go
index 5213d059..c900b6de 100644
--- a/backend/internal/service/app_config_service.go
+++ b/backend/internal/service/app_config_service.go
@@ -321,7 +321,7 @@ func (s *AppConfigService) ListAppConfig(showAll bool) []model.AppConfigVariable
 }
 
 func (s *AppConfigService) UpdateImage(ctx context.Context, uploadedFile *multipart.FileHeader, imageName string, oldImageType string) (err error) {
-	fileType := utils.GetFileExtension(uploadedFile.Filename)
+	fileType := strings.ToLower(utils.GetFileExtension(uploadedFile.Filename))
 	mimeType := utils.GetImageMimeType(fileType)
 	if mimeType == "" {
 		return &common.FileTypeNotSupportedError{}
diff --git a/backend/internal/service/oidc_service.go b/backend/internal/service/oidc_service.go
index b4e26706..534863cc 100644
--- a/backend/internal/service/oidc_service.go
+++ b/backend/internal/service/oidc_service.go
@@ -820,7 +820,7 @@ func (s *OidcService) GetClientLogo(ctx context.Context, clientID string) (strin
 }
 
 func (s *OidcService) UpdateClientLogo(ctx context.Context, clientID string, file *multipart.FileHeader) error {
-	fileType := utils.GetFileExtension(file.Filename)
+	fileType := strings.ToLower(utils.GetFileExtension(file.Filename))
 	if mimeType := utils.GetImageMimeType(fileType); mimeType == "" {
 		return &common.FileTypeNotSupportedError{}
 	}
diff --git a/backend/internal/utils/file_util.go b/backend/internal/utils/file_util.go
index 0fa322dc..65ef5c51 100644
--- a/backend/internal/utils/file_util.go
+++ b/backend/internal/utils/file_util.go
@@ -3,13 +3,12 @@ package utils
 import (
 	"errors"
 	"fmt"
+	"github.com/google/uuid"
+	"github.com/pocket-id/pocket-id/backend/resources"
 	"io"
 	"mime/multipart"
 	"os"
 	"path/filepath"
-
-	"github.com/google/uuid"
-	"github.com/pocket-id/pocket-id/backend/resources"
 )
 
 func GetFileExtension(filename string) string {