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%% Copyright (c) 2020, Loïc Hoguin <[email protected]>
%%
%% Permission to use, copy, modify, and/or distribute this software for any
%% purpose with or without fee is hereby granted, provided that the above
%% copyright notice and this permission notice appear in all copies.
%%
%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-module(gun_protocols).
-export([add_stream_ref/2]).
-export([handler/1]).
-export([handler_and_opts/2]).
-export([negotiated/2]).
-spec add_stream_ref(Protocol, undefined | gun:stream_ref())
-> Protocol when Protocol :: gun:protocol().
add_stream_ref(Protocol, undefined) ->
Protocol;
add_stream_ref({ProtocolName, ProtocolOpts}, StreamRef) ->
{ProtocolName, ProtocolOpts#{stream_ref => StreamRef}};
add_stream_ref(ProtocolName, StreamRef) ->
{ProtocolName, #{stream_ref => StreamRef}}.
-spec handler(gun:protocol()) -> module().
handler(http) -> gun_http;
handler({http, _}) -> gun_http;
handler(http2) -> gun_http2;
handler({http2, _}) -> gun_http2;
handler(raw) -> gun_raw;
handler({raw, _}) -> gun_raw;
handler(socks) -> gun_socks;
handler({socks, _}) -> gun_socks;
handler(ws) -> gun_ws;
handler({ws, _}) -> gun_ws.
-spec handler_and_opts(gun:protocol(), map()) -> {module(), map()}.
handler_and_opts({ProtocolName, ProtocolOpts}, _) ->
{handler(ProtocolName), ProtocolOpts};
handler_and_opts(ProtocolName, Opts) ->
Protocol = handler(ProtocolName),
{Protocol, maps:get(Protocol:opts_name(), Opts, #{})}.
-spec negotiated({ok, binary()} | {error, protocol_not_negotiated}, gun:protocols())
-> http | http2 | raw | socks.
negotiated({ok, <<"h2">>}, _) -> http2;
negotiated({ok, <<"http/1.1">>}, _) -> http;
negotiated({error, protocol_not_negotiated}, [Protocol]) -> Protocol;
negotiated({error, protocol_not_negotiated}, _) -> http.
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