Add trailing slashes when accessing folders

src/main/java/sh/rhiobet/lalafin/file/FileResource.java

@@ -1,5 +1,6 @@
 package sh.rhiobet.lalafin.file;
 
+import java.net.URI;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -62,6 +63,10 @@ public class FileResource {
         FileInfoBase fileInfoBase = fileInfoService.getInfo(names, fileTokenProvider);
 
         if (fileInfoBase instanceof FolderInfo) {
+            if (!uriInfo.getRequestUri().getPath().endsWith("/")) {
+                return Response.status(Response.Status.MOVED_PERMANENTLY)
+                        .location(URI.create(uriInfo.getRequestUri().getPath() + "/")).build();
+            }
             return fileServeService.serveFolder((FolderInfo) fileInfoBase);
         } else if (fileInfoBase instanceof FileInfo) {
             return fileServeService.serveFile((FileInfo) fileInfoBase, range);