improve file streams

backend/src/lib/outbound/file_system.rs

@@ -265,7 +265,11 @@ impl FileSystem {
                 }
             });
 
-            FileStream::new(FileType::Directory, ReceiverStream::new(rx))
+            FileStream::new(
+                FileType::Directory,
+                Some(FileMimeType::new_raw("application/zip")),
+                ReceiverStream::new(rx),
+            )
         }
 
         match path_request {
@@ -293,7 +297,20 @@ impl FileSystem {
                     bail!("File size exceeds configured limit");
                 }
 
-                let stream = FileStream::new(FileType::File, ReaderStream::new(file));
+                let mime_type = {
+                    let file_name = {
+                        let path = file_path.as_str();
+                        if let Some(last_slash_index) = path.rfind("/") {
+                            &path[last_slash_index + 1..]
+                        } else {
+                            path
+                        }
+                    };
+
+                    FileMimeType::from_name(file_name)
+                };
+
+                let stream = FileStream::new(FileType::File, mime_type, ReaderStream::new(file));
 
                 Ok(stream)
             }