(*****************************************************************************)
(* *)
(* Open Source License *)
(* Copyright (c) 2022 Nomadic Labs, <contact@nomadic-labs.com> *)
(* *)
(* Permission is hereby granted, free of charge, to any person obtaining a *)
(* copy of this software and associated documentation files (the "Software"),*)
(* to deal in the Software without restriction, including without limitation *)
(* the rights to use, copy, modify, merge, publish, distribute, sublicense, *)
(* and/or sell copies of the Software, and to permit persons to whom the *)
(* Software is furnished to do so, subject to the following conditions: *)
(* *)
(* The above copyright notice and this permission notice shall be included *)
(* in all copies or substantial portions of the Software. *)
(* *)
(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR*)
(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *)
(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *)
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(* DEALINGS IN THE SOFTWARE. *)
(* *)
(*****************************************************************************)
let make_transform_callback forwarding_endpoint callback conn req body =
let open Lwt_syntax in
let* answer = callback conn req body in
let open Cohttp in
let uri = Request.uri req in
let answer_has_not_found_status = function
| `Expert (response, _) | `Response (response, _) ->
Cohttp.Response.status response = `Not_found
in
if answer_has_not_found_status answer then
let overriding = Uri.to_string forwarding_endpoint ^ Uri.path uri in
let headers = Cohttp.Header.of_list [("Location", overriding)] in
let response =
Cohttp.Response.make ~status:`Moved_permanently ~headers ()
in
Lwt.return (`Response (response, Cohttp_lwt.Body.empty))
else Lwt.return answer
let query_forwarder forwarding_endpoint =
Resto_cohttp_server.Server.
{transform_callback = make_transform_callback forwarding_endpoint}