133 lines
4.5 KiB
OCaml
133 lines
4.5 KiB
OCaml
(* MTE - the MirageOS Taler Exchange
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Copyright (C) 2025 Olivier Pierre <swrup@protonmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, version 3.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. *)
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let error_detail ?hint _status =
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let open Types.ErrorDetail in
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let open Json in
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let code = -1 in
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let s = encode_exn ErrorDetail.jsont { code; hint } in
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s
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module Respond_with = struct
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open Vif.Response
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open Syntax
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let bad_request ?hint req =
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let body = error_detail ?hint `Bad_request in
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let* () = with_string ?compression:None req body in
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respond `Bad_request
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let not_modified () =
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let* () = empty in
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respond `Not_modified
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let unsupported_media_type req =
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let body =
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error_detail ~hint:"no acceptable mimetype" `Unsupported_media_type
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in
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let* () = with_string ?compression:None req body in
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let* () = add ~field:"accept" Headers.accept_header_value in
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respond `Unsupported_media_type
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end
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(* TODO check for mathcing ETAG with a middleware instead? *)
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(* /terms + /privacy
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- try to find a response with an acceptable mime-type
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- pick the version in the most preferred language of the user
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- apply compression if that is allowed by the client
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- set ETAG header
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- If it did not change, a "304 Not Modified" response will be returned
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- A "Taler-Terms-Version" header is generated to indicate the legal version of the terms
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- When returning a full response (not a "304 Not Modified"),
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include a "Avail-Languages" header: a comma-separated list of the languages available *)
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module Static = struct
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let f kind req _server _env =
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let etag = Assets.etag kind in
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let headers = Vif.Request.headers req in
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let has_matching_etag =
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match Vif.Headers.get headers "if-none-match" with
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| None -> Ok false
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| Some s ->
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Headers_lib.Etag.parse s
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|> Result.map (Headers_lib.Etag.evaluate etag)
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in
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match has_matching_etag with
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| Error e -> Respond_with.bad_request ~hint:e req
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| Ok true -> Respond_with.not_modified ()
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| Ok false -> (
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match Headers.select_mimetype headers with
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| None -> Respond_with.unsupported_media_type req
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| Some mime ->
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let lang = Headers.select_language headers in
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let compression = Headers.select_encoding headers in
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let data = Assets.get_content ~mime ~lang kind in
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(* -- *)
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let open Vif.Response in
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let open Syntax in
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let* () = with_string ?compression req data in
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let* () =
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let etag_field_value = Headers_lib.Etag.to_field_value etag in
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add ~field:"etag" etag_field_value
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in
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let* () =
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(* todo: is it "taler-privacy-version" for /policy ? *)
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add ~field:"taler-terms-version" Assets.Config.terms_legal_version
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in
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let* () =
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add ~field:"avail-languages" Headers.avail_languages_header_value
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in
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let* () =
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let content_type = Fmt.str "%a" Assets.Mimetype.pp_mime mime in
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add ~field:"content-type" content_type
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in
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respond `OK)
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let terms = f Assets.Terms
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let privacy = f Assets.Privacy
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end
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let hello req _server _env =
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let open Vif.Response in
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let open Syntax in
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let* () = with_string req "Hello~~\n" in
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let* () = add ~field:"content-type" "text/plain" in
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respond `OK
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let routes =
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let open Vif.Uri in
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let open Vif.Route in
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(*let open Vif.Type in*)
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[
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get (rel /?? nil) --> hello; get (rel / "terms" /?? nil) --> Static.terms;
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get (rel / "privacy" /?? nil) --> Static.privacy;
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]
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let () =
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let cfg =
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let port = 3696 in
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let sockaddr = Unix.(ADDR_INET (inet_addr_loopback, port)) in
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Vif.config sockaddr
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in
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Miou_unix.run @@ fun () ->
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let env = () in
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let devices =
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Vif.Devices.
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[
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Management.eddsa_online_key_device;
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Management.rsa_denomination_key_device;
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]
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in
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let middlewares = Vif.Middlewares.[] in
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Vif.run ~cfg ~devices ~middlewares routes env
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