add flash message

packages/auth/src/middleware/auth.ts

@@ -15,7 +15,7 @@ export const authMiddleware = async (
   const strategy = authenticator.get<OAuth2Strategy<User>>('oidc')
   const session = await sessionStorage.getSession(request.headers.get('cookie'))
   const requestId = context.get(requestIdContext)
-  let user = session.get('user') as User | null
+  let user = session.get('user')
 
   if (!user) {
     console.log('There is no user logged in')
@@ -67,7 +67,11 @@ export const authMiddleware = async (
   context.set(userContext, user)
 
   const response = await next()
-  const sessionCookie = await sessionStorage.commitSession(session)
-  response.headers.set('Set-Cookie', sessionCookie)
+
+  if (!response.headers.has('Set-Cookie')) {
+    const sessionCookie = await sessionStorage.commitSession(session)
+    response.headers.set('Set-Cookie', sessionCookie)
+  }
+
   return response
 }