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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%
%%
-module(redirect_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]).
%% Dictionary to encode answer-message AVPs with.
-define(Dict, diameter_gen_base_rfc6733).
%% 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/4
pick_peer(_, _, _SvcName, _State) ->
false.
%% prepare_request/3
prepare_request(_, _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
handle_request(#diameter_packet{avps = Avps}, _, {_, Caps}) ->
#diameter_caps{origin_host = {OH, _},
origin_realm = {OR, _}}
= Caps,
Tail = [#diameter_avp{data = {?Dict, A, V}}
|| {A,V} <- [{'Origin-Host', OH},
{'Origin-Realm', OR},
{'Result-Code', 3006}, %% DIAMETER_REDIRECT_INDICATION
{'Redirect-Host', <<"aaa://server.example.com:3868">>}]],
{reply, ['answer-message' | lists:append([session(Avps), Tail])]}.
%% ===========================================================================
%% session/1
session(Avps) ->
try
[] = [A || #diameter_avp{code = 263, vendor_id = undefined} = A
<- Avps,
throw(A)]
catch
Avp -> [Avp]
end.
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