Setting up trpc behind AWS API gateway and authorizing using a lambda

Current setup: - trpc api, containing both public an private procedures. Let's call them posts.list (public) posts.create (private) - API gateway routes GET /trpc/{proxy+} and POST /trpc/{proxy+} that invoke a lambda handler for trpc (let's call it trpc.handler) - Auth is handled inside of trpc.handler using a middleware that checks the token etc. Setup I want: - Extract the auth part into a different lambda (let's call it auth.handler) - Only run this authorizer for the private routes. As I don't know in advance what the request url might look like (e.g. it could be batched), is this possible to setup?
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