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%%%-------------------------------------------------------------------
%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% @copyright (C) 2014, Evgeny Khramtsov
%%% @doc
%%%
%%% @end
%%% Created : 21 Apr 2014 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%-------------------------------------------------------------------
-module(mod_sip_proxy).
-define(GEN_FSM, p1_fsm).
-behaviour(?GEN_FSM).
%% API
-export([start/2, start_link/2, route/4, route/5]).
%% gen_fsm callbacks
-export([init/1, wait_for_request/2, wait_for_response/2,
handle_event/3, handle_sync_event/4,
handle_info/3, terminate/3, code_change/4]).
-include("ejabberd.hrl").
-include("logger.hrl").
-include("esip.hrl").
-define(MAX_REDIRECTS, 5).
-record(state, {host = <<"">> :: binary(),
opts = [] :: [{certfile, binary()}],
orig_trid,
orig_req :: #sip{},
client_trid}).
%%%===================================================================
%%% API
%%%===================================================================
start(LServer, Opts) ->
supervisor:start_child(mod_sip_proxy_sup, [LServer, Opts]).
start_link(LServer, Opts) ->
?GEN_FSM:start_link(?MODULE, [LServer, Opts], []).
route(Resp, Req, _SIPSock, TrID, Pid) ->
?GEN_FSM:send_event(Pid, {Resp, Req, TrID}).
route(SIPMsg, _SIPSock, TrID, Pid) ->
?GEN_FSM:send_event(Pid, {SIPMsg, TrID}),
wait.
%%%===================================================================
%%% gen_fsm callbacks
%%%===================================================================
init([Host, Opts]) ->
{ok, wait_for_request, #state{opts = Opts, host = Host}}.
wait_for_request({#sip{type = request} = Req, TrID}, State) ->
Opts = mod_sip:add_certfile(State#state.host, State#state.opts),
Req1 = mod_sip:prepare_request(Req),
case connect(Req1, Opts) of
{ok, SIPSocket} ->
Req2 = mod_sip:add_via(SIPSocket, State#state.host, Req1),
case esip:request(SIPSocket, Req2, {?MODULE, route, [self()]}) of
{ok, ClientTrID} ->
{next_state, wait_for_response,
State#state{orig_trid = TrID,
orig_req = Req,
client_trid = ClientTrID}};
Err ->
{Status, Reason} = esip:error_status(Err),
esip:reply(TrID, mod_sip:make_response(
Req, #sip{type = response,
status = Status,
reason = Reason})),
{stop, normal, State}
end;
Err ->
{Status, Reason} = esip:error_status(Err),
esip:reply(TrID, mod_sip:make_response(
Req, #sip{type = response,
status = Status,
reason = Reason})),
{stop, normal, State}
end;
wait_for_request(_Event, State) ->
{next_state, wait_for_request, State}.
wait_for_response({#sip{method = <<"CANCEL">>, type = request}, _TrID}, State) ->
esip:cancel(State#state.client_trid),
{next_state, wait_for_response, State};
wait_for_response({Resp, _TrID}, State) ->
case Resp of
{error, _} ->
Req = State#state.orig_req,
{Status, Reason} = esip:error_status(Resp),
case Status of
408 when Req#sip.method /= <<"INVITE">> ->
%% Absorb useless 408. See RFC4320
esip:stop_transaction(State#state.orig_trid);
_ ->
ErrResp = mod_sip:make_response(
Req,
#sip{type = response,
status = Status,
reason = Reason}),
esip:reply(State#state.orig_trid, ErrResp)
end,
{stop, normal, State};
#sip{status = 100} ->
{next_state, wait_for_response, State};
#sip{status = Status} ->
case esip:split_hdrs('via', Resp#sip.hdrs) of
{[_], _} ->
{stop, normal, State};
{[_|Vias], NewHdrs} ->
esip:reply(State#state.orig_trid,
Resp#sip{hdrs = [{'via', Vias}|NewHdrs]}),
if Status < 200 ->
{next_state, wait_for_response, State};
true ->
{stop, normal, State}
end
end
end;
wait_for_response(_Event, State) ->
{next_state, wait_for_response, State}.
handle_event(_Event, StateName, State) ->
{next_state, StateName, State}.
handle_sync_event(_Event, _From, StateName, State) ->
Reply = ok,
{reply, Reply, StateName, State}.
handle_info(_Info, StateName, State) ->
{next_state, StateName, State}.
terminate(_Reason, _StateName, _State) ->
ok.
code_change(_OldVsn, StateName, State, _Extra) ->
{ok, StateName, State}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
connect(Req, Opts) ->
case proplists:get_value(socket, Opts) of
undefined ->
esip:connect(Req, Opts);
#sip_socket{} = SIPSock ->
{ok, SIPSock}
end.
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