fix attachments + test

core/server.py

@@ -472,10 +472,11 @@ async def health_check(request: Request):
 
 
 @server.custom_route("/attachments/{file_id}", methods=["GET"])
-async def serve_attachment(file_id: str):
+async def serve_attachment(request: Request):
     """Serve a stored attachment file."""
     from core.attachment_storage import get_attachment_storage
 
+    file_id = request.path_params["file_id"]
     storage = get_attachment_storage()
     metadata = storage.get_attachment_metadata(file_id)
 

tests/core/test_attachment_route.py

@@ -0,0 +1,69 @@
+import pytest
+from starlette.requests import Request
+from starlette.responses import FileResponse, JSONResponse
+
+from core.server import serve_attachment
+
+
+def _build_request(file_id: str) -> Request:
+    scope = {
+        "type": "http",
+        "asgi": {"version": "3.0"},
+        "http_version": "1.1",
+        "method": "GET",
+        "scheme": "http",
+        "path": f"/attachments/{file_id}",
+        "raw_path": f"/attachments/{file_id}".encode(),
+        "query_string": b"",
+        "headers": [],
+        "client": ("127.0.0.1", 12345),
+        "server": ("localhost", 8000),
+        "path_params": {"file_id": file_id},
+    }
+
+    async def receive():
+        return {"type": "http.request", "body": b"", "more_body": False}
+
+    return Request(scope, receive)
+
+
+@pytest.mark.asyncio
+async def test_serve_attachment_uses_path_param_file_id(monkeypatch, tmp_path):
+    file_path = tmp_path / "sample.pdf"
+    file_path.write_bytes(b"%PDF-1.3\n")
+    captured = {}
+
+    class DummyStorage:
+        def get_attachment_metadata(self, file_id):
+            captured["file_id"] = file_id
+            return {"filename": "sample.pdf", "mime_type": "application/pdf"}
+
+        def get_attachment_path(self, _file_id):
+            return file_path
+
+    monkeypatch.setattr(
+        "core.attachment_storage.get_attachment_storage", lambda: DummyStorage()
+    )
+
+    response = await serve_attachment(_build_request("abc123"))
+
+    assert captured["file_id"] == "abc123"
+    assert isinstance(response, FileResponse)
+    assert response.status_code == 200
+
+
+@pytest.mark.asyncio
+async def test_serve_attachment_404_when_metadata_missing(monkeypatch):
+    class DummyStorage:
+        def get_attachment_metadata(self, _file_id):
+            return None
+
+    monkeypatch.setattr(
+        "core.attachment_storage.get_attachment_storage", lambda: DummyStorage()
+    )
+
+    response = await serve_attachment(_build_request("missing"))
+
+    assert isinstance(response, JSONResponse)
+    assert response.status_code == 404
+    assert b"Attachment not found or expired" in response.body