From 8517bc169acc42cedecccd3022da56b2ce96d822 Mon Sep 17 00:00:00 2001
From: "David H. Irving" <david.irving@noirlab.edu>
Date: Wed, 8 May 2024 14:38:36 -0700
Subject: [PATCH] Create a Butler to handle each request

---
 src/butlerexampleservice/handlers/external.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/butlerexampleservice/handlers/external.py b/src/butlerexampleservice/handlers/external.py
index 51d83a1..e63a183 100644
--- a/src/butlerexampleservice/handlers/external.py
+++ b/src/butlerexampleservice/handlers/external.py
@@ -15,8 +15,12 @@
 external_router = APIRouter()
 """FastAPI router for all external handlers."""
 
+from lsst.daf.butler import LabeledButlerFactory
 from safir.dependencies.gafaelfawr import auth_delegated_token_dependency
 
+_BUTLER_FACTORY = LabeledButlerFactory()
+_BUTLER_REPOSITORY = "dp02"
+
 
 @external_router.get("/coadd_url")
 def get_coadd_url(
@@ -24,6 +28,10 @@ def get_coadd_url(
     patch: int,
     delegated_token: Annotated[str, Depends(auth_delegated_token_dependency)],
 ) -> str:
+    butler = _BUTLER_FACTORY.create_butler(
+        label=_BUTLER_REPOSITORY, access_token=delegated_token
+    )
+
     return f"http://stub.example/{tract}/{patch}"