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|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2010-2020. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
%% The diameter application callback module configured by server.erl.
%%
-module(server_cb).
-include_lib("diameter/include/diameter.hrl").
%% diameter callbacks
-export([peer_up/3,
peer_down/3,
pick_peer/4,
prepare_request/3,
prepare_retransmit/3,
handle_answer/4,
handle_error/4,
handle_request/3]).
%% Raise an error on callbacks that aren't expected.
-define(ERROR, error({unexpected, ?MODULE, ?LINE})).
%% peer_up/3
peer_up(_SvcName, _Peer, State) ->
State.
%% peer_down/3
peer_down(_SvcName, _Peer, State) ->
State.
%% pick_peer/3
%% Don't let requests be sent, so other request callbacks shouldn't
%% happen.
pick_peer(_LocalCandidates, _RemoteCandidates, _SvcName, _State) ->
false.
%% prepare_request/3
prepare_request(_Packet, _SvcName, _Peer) ->
?ERROR.
%% prepare_retransmit/3
prepare_retransmit(_Packet, _SvcName, _Peer) ->
?ERROR.
%% handle_answer/4
handle_answer(_Packet, _Request, _SvcName, _Peer) ->
?ERROR.
%% handle_error/4
handle_error(_Reason, _Request, _SvcName, _Peer) ->
?ERROR.
%% handle_request/3
%% ACR without decode errors.
handle_request(#diameter_packet{msg = ['ACR' | #{} = Request],
errors = []},
_SvcName,
{_, Caps}) ->
#diameter_caps{origin_host = {OH,_},
origin_realm = {OR,_}}
= Caps,
#{'Session-Id' := Sid,
'Accounting-Record-Type' := T,
'Accounting-Record-Number' := N}
= Request,
Answer = #{'Result-Code' => 2001, %% DIAMETER_SUCCESS
'Origin-Host' => OH,
'Origin-Realm' => OR,
'Session-Id' => Sid,
'Accounting-Record-Type' => T,
'Accounting-Record-Number' => N},
{reply, ['ACA' | Answer]};
%% ACR with decode errors.
handle_request(#diameter_packet{msg = ['ACR' | #{} = Request]},
_SvcName,
{_, Caps}) ->
#diameter_caps{origin_host = {OH,_},
origin_realm = {OR,_}}
= Caps,
Answer = maps:merge(maps:with(['Session-Id'], Request),
#{'Origin-Host' => OH,
'Origin-Realm' => OR}),
%% Let diameter set Result-Code and Failed-AVP if there were
%% decode errors.
{reply, ['answer-message' | Answer]};
%% Answer anything else as unsupported.
handle_request(#diameter_packet{}, _SvcName, _) ->
{answer_message, 3001}. %% DIAMETER_COMMAND_UNSUPPORTED
|
