511 lines
15 KiB
Erlang
511 lines
15 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_c2s.erl
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%%% Author : Alexey Shchepin <alexey@sevcom.net>
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%%% Purpose :
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%%% Created : 16 Nov 2002 by Alexey Shchepin <alexey@sevcom.net>
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%%% Id : $Id$
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%%%----------------------------------------------------------------------
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-module(ejabberd_c2s).
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-author('alexey@sevcom.net').
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-vsn('$Revision$ ').
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-behaviour(gen_fsm).
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%% External exports
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-export([start/1, receiver/2, sender/1, send_text/2, send_element/2]).
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%% gen_fsm callbacks
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%-export([init/1, state_name/2, state_name/3, handle_event/3,
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% handle_sync_event/4, handle_info/3, terminate/3]).
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%
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-export([init/1, wait_for_stream/2, wait_for_auth/2, session_established/2,
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handle_info/3,
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terminate/3]).
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-include("ejabberd.hrl").
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-define(SETS, gb_sets).
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-record(state, {socket, sender, receiver, streamid,
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user = "", server = ?MYNAME, resource = "",
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pres_t = ?SETS:new(),
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pres_f = ?SETS:new(),
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pres_a = ?SETS:new(),
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pres_i = ?SETS:new(),
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pres_last, pres_pri,
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pres_timestamp,
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pres_invis = false}).
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%-define(DBGFSM, true).
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-ifdef(DBGFSM).
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-define(FSMOPTS, [{debug, [trace]}]).
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-else.
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-define(FSMOPTS, []).
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-endif.
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-define(STREAM_HEADER,
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"<?xml version='1.0'?>"
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"<stream:stream xmlns='jabber:client' "
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"xmlns:stream='http://etherx.jabber.org/streams' "
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"id='~s' from='~s'>"
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).
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-define(STREAM_TRAILER, "</stream:stream>").
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-define(INVALID_NS_ERR, "<stream:error>Invalid Namespace</stream:error>").
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%%%----------------------------------------------------------------------
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%%% API
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%%%----------------------------------------------------------------------
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start(Socket) ->
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gen_fsm:start(ejabberd_c2s, [Socket], ?FSMOPTS).
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%%%----------------------------------------------------------------------
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%%% Callback functions from gen_fsm
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%%%----------------------------------------------------------------------
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%%----------------------------------------------------------------------
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%% Func: init/1
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%% Returns: {ok, StateName, StateData} |
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%% {ok, StateName, StateData, Timeout} |
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%% ignore |
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%% {stop, StopReason}
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%%----------------------------------------------------------------------
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init([Socket]) ->
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SenderPid = spawn(?MODULE, sender, [Socket]),
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ReceiverPid = spawn(?MODULE, receiver, [Socket, self()]),
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{ok, wait_for_stream, #state{socket = Socket,
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receiver = ReceiverPid,
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sender = SenderPid,
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streamid = new_id()}}.
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%%----------------------------------------------------------------------
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%% Func: StateName/2
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData}
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%%----------------------------------------------------------------------
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state_name(Event, StateData) ->
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{next_state, state_name, StateData}.
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wait_for_stream({xmlstreamstart, Name, Attrs}, StateData) ->
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% TODO
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Header = io_lib:format(?STREAM_HEADER,
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[StateData#state.streamid, ?MYNAME]),
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send_text(StateData#state.sender, Header),
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case lists:keysearch("xmlns:stream", 1, Attrs) of
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{value, {"xmlns:stream", "http://etherx.jabber.org/streams"}} ->
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% TODO
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{next_state, wait_for_auth, StateData};
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_ ->
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send_text(StateData#state.sender, ?INVALID_NS_ERR ?STREAM_TRAILER),
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{stop, normal, StateData}
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end;
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wait_for_stream(closed, StateData) ->
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{stop, normal, StateData}.
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wait_for_auth({xmlstreamelement, El}, StateData) ->
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case is_auth_packet(El) of
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{auth, ID, {U, P, D, R}} ->
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io:format("AUTH: ~p~n", [{U, P, D, R}]),
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% TODO: digested password
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case ejabberd_auth:check_password(U, P) of
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true ->
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% TODO
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ejabberd_sm:open_session(U, R),
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Res = jlib:make_result_iq_reply(El),
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send_element(StateData#state.sender, Res),
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{Fs, Ts} = mod_roster:get_subscription_lists(U),
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{next_state, session_established,
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StateData#state{user = U,
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resource = R,
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pres_f = ?SETS:from_list(Fs),
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pres_t = ?SETS:from_list(Ts)}};
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_ ->
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Err = jlib:make_error_reply(El, "401", "Unauthorized"),
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send_element(StateData#state.sender, Err),
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{next_state, wait_for_auth, StateData}
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end;
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_ ->
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case jlib:iq_query_info(El) of
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{iq, ID, Type, "jabber:iq:register", SubEl} ->
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ResIQ = mod_register:process_iq(
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{"", "", ""}, {"", ?MYNAME, ""},
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{iq, ID, Type, "jabber:iq:register", SubEl}),
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Res1 = jlib:replace_from_to({"", ?MYNAME, ""},
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{"", "", ""},
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jlib:iq_to_xml(ResIQ)),
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Res = jlib:remove_attr("to", Res1),
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send_element(StateData#state.sender, Res),
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{next_state, wait_for_auth, StateData};
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_ ->
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{next_state, wait_for_auth, StateData}
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end
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end;
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wait_for_auth({xmlstreamend, Name}, StateData) ->
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% TODO
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{stop, normal, StateData};
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wait_for_auth(closed, StateData) ->
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{stop, normal, StateData}.
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session_established({xmlstreamelement, El}, StateData) ->
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{xmlelement, Name, Attrs, Els} = El,
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Server = StateData#state.server,
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FromJID = {StateData#state.user,
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Server,
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StateData#state.resource},
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To = xml:get_attr_s("to", Attrs),
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ToJID = case To of
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"" ->
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{"", Server, ""};
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_ ->
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jlib:string_to_jid(To)
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end,
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NewState =
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case ToJID of
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error ->
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% TODO
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StateData;
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_ ->
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case Name of
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"presence" ->
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case ToJID of
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{"", Server, ""} ->
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?DEBUG("presence_update(~p,~n\t~p,~n\t~p)",
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[FromJID, El, StateData]),
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presence_update(FromJID, El, StateData);
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_ ->
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StateData
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end;
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_ ->
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ejabberd_router:route(FromJID, ToJID, El),
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StateData
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end
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end,
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{next_state, session_established, NewState};
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session_established({xmlstreamend, Name}, StateData) ->
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{stop, normal, StateData};
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session_established(closed, StateData) ->
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% TODO
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{stop, normal, StateData}.
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%%----------------------------------------------------------------------
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%% Func: StateName/3
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {reply, Reply, NextStateName, NextStateData} |
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%% {reply, Reply, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData} |
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%% {stop, Reason, Reply, NewStateData}
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%%----------------------------------------------------------------------
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state_name(Event, From, StateData) ->
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Reply = ok,
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{reply, Reply, state_name, StateData}.
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%%----------------------------------------------------------------------
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%% Func: handle_event/3
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData}
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%%----------------------------------------------------------------------
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handle_event(Event, StateName, StateData) ->
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{next_state, StateName, StateData}.
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%%----------------------------------------------------------------------
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%% Func: handle_sync_event/4
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {reply, Reply, NextStateName, NextStateData} |
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%% {reply, Reply, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData} |
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%% {stop, Reason, Reply, NewStateData}
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%%----------------------------------------------------------------------
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handle_sync_event(Event, From, StateName, StateData) ->
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Reply = ok,
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{reply, Reply, StateName, StateData}.
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%%----------------------------------------------------------------------
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%% Func: handle_info/3
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData}
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%%----------------------------------------------------------------------
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handle_info({send_text, Text}, StateName, StateData) ->
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send_text(StateData#state.sender, Text),
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{next_state, StateName, StateData};
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handle_info({route, From, To, Packet}, StateName, StateData) ->
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{xmlelement, Name, Attrs, Els} = Packet,
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% TODO
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{Pass, NewAttrs, NewState} =
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case Name of
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"presence" ->
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case xml:get_attr_s("type", Attrs) of
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"probe" ->
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process_presence_probe(From, To, StateData),
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{false, Attrs, StateData};
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"error" ->
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case ?SETS:is_element(From, StateData#state.pres_a) of
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true ->
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A = ?SETS:del_element(From,
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StateData#state.pres_a),
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{true, Attrs, StateData#state{pres_a = A}};
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_ ->
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{true, Attrs, StateData}
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end;
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"invisible" ->
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Attrs1 = lists:keydelete("type", 1, Attrs),
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{true, [{"type", "unavailable"} | Attrs1], StateData};
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"subscribe" ->
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% TODO
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{true, Attrs, StateData};
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"unsubscribe" ->
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% TODO
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{true, Attrs, StateData};
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_ ->
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{true, Attrs, StateData}
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end;
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_ ->
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{true, Attrs, StateData}
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end,
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if Pass ->
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Attrs2 = jlib:replace_from_to_attrs(jlib:jid_to_string(From),
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jlib:jid_to_string(To),
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NewAttrs),
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Text = xml:element_to_string({xmlelement, Name, Attrs2, Els}),
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send_text(StateData#state.sender, Text);
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true ->
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ok
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end,
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{next_state, StateName, NewState}.
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%%----------------------------------------------------------------------
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%% Func: terminate/3
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%% Purpose: Shutdown the fsm
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%% Returns: any
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%%----------------------------------------------------------------------
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terminate(Reason, StateName, StateData) ->
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case StateData#state.user of
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"" ->
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ok;
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_ ->
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ejabberd_sm:close_session(StateData#state.user,
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StateData#state.resource)
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end,
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StateData#state.sender ! close,
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ok.
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%%%----------------------------------------------------------------------
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%%% Internal functions
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%%%----------------------------------------------------------------------
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receiver(Socket, C2SPid) ->
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XMLStreamPid = xml_stream:start(C2SPid),
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receiver(Socket, C2SPid, XMLStreamPid).
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receiver(Socket, C2SPid, XMLStreamPid) ->
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case gen_tcp:recv(Socket, 0) of
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{ok, Text} ->
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xml_stream:send_text(XMLStreamPid, Text),
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receiver(Socket, C2SPid, XMLStreamPid);
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{error, closed} ->
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exit(XMLStreamPid, closed),
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gen_fsm:send_event(C2SPid, closed),
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ok
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end.
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sender(Socket) ->
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receive
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{send_text, Text} ->
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gen_tcp:send(Socket,Text),
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sender(Socket);
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close ->
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gen_tcp:close(Socket),
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ok
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end.
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send_text(Pid, Text) ->
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Pid ! {send_text, Text}.
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send_element(Pid, El) ->
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send_text(Pid, xml:element_to_string(El)).
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new_id() ->
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randoms:get_string().
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is_auth_packet({xmlelement, Name, Attrs, Els}) when Name == "iq" ->
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case xml:get_attr_s("type", Attrs) of
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"set" ->
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case xml:remove_cdata(Els) of
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[{xmlelement, "query", Attrs2, Els2}] ->
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case xml:get_attr_s("xmlns", Attrs2) of
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"jabber:iq:auth" ->
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{auth,
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xml:get_attr_s("id", Attrs),
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get_auth_tags(Els2, "", "", "", "")};
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_ -> false
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end;
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_ ->
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false
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end;
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true ->
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false
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end;
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is_auth_packet(_) ->
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false.
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get_auth_tags([{xmlelement, Name, Attrs, Els}| L], U, P, D, R) ->
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CData = xml:get_cdata(Els),
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case Name of
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"username" ->
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get_auth_tags(L, CData, P, D, R);
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"password" ->
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get_auth_tags(L, U, CData, D, R);
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"digest" ->
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get_auth_tags(L, U, P, CData, R);
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"resource" ->
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get_auth_tags(L, U, P, D, CData);
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_ ->
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get_auth_tags(L, U, P, D, R)
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end;
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get_auth_tags([_ | L], U, P, D, R) ->
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get_auth_tags(L, U, P, D, R);
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get_auth_tags([], U, P, D, R) ->
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{U, P, D, R}.
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process_presence_probe(From, To, StateData) ->
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case StateData#state.pres_last of
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undefined ->
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ok;
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_ ->
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Cond1 = (not StateData#state.pres_invis)
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and ?SETS:is_element(From, StateData#state.pres_f)
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and (not ?SETS:is_element(From, StateData#state.pres_i)),
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Cond2 = StateData#state.pres_invis
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and ?SETS:is_element(From, StateData#state.pres_f)
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and ?SETS:is_element(From, StateData#state.pres_a),
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if
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Cond1 ->
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ejabberd_router:route(To, From,
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StateData#state.pres_last);
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Cond2 ->
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ejabberd_router:route(To, From,
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{xmlelement, "presence",
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[],
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[]});
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true ->
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ok
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end
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end.
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presence_update(From, Packet, StateData) ->
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{xmlelement, Name, Attrs, Els} = Packet,
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case xml:get_attr_s("type", Attrs) of
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"unavailable" ->
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presence_broadcast(From, StateData#state.pres_a, Packet),
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presence_broadcast(From, StateData#state.pres_i, Packet),
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StateData#state{pres_last = undefined,
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pres_a = ?SETS:new(),
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pres_i = ?SETS:new(),
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pres_invis = false};
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"invisible" ->
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NewState =
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if
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not StateData#state.pres_invis ->
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presence_broadcast(From, StateData#state.pres_a,
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Packet),
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presence_broadcast(From, StateData#state.pres_i,
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Packet),
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S1 = StateData#state{pres_last = undefined,
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pres_a = ?SETS:new(),
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pres_i = ?SETS:new(),
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pres_invis = false},
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presence_broadcast_first(From, S1, Packet);
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true ->
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StateData
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end,
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StateData;
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"error" ->
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StateData;
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_ ->
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FromUnavail = (StateData#state.pres_last == undefined) or
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StateData#state.pres_invis,
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?DEBUG("from unavail = ~p~n", [FromUnavail]),
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NewState =
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if
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FromUnavail ->
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% TODO: watching ourself
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presence_broadcast_first(From, StateData, Packet);
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true ->
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presence_broadcast_to_trusted(From,
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StateData#state.pres_f,
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StateData#state.pres_a,
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Packet),
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StateData
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end,
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NewState#state{pres_last = Packet,
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pres_invis = false
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}
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end.
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presence_broadcast(From, JIDSet, Packet) ->
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lists:foreach(fun(JID) ->
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ejabberd_router:route(From, JID, Packet)
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end, ?SETS:to_list(JIDSet)).
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presence_broadcast_to_trusted(From, T, A, Packet) ->
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lists:foreach(fun(JID) ->
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case ?SETS:is_element(JID, T) of
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true ->
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ejabberd_router:route(From, JID, Packet);
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_ ->
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ok
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end
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end, ?SETS:to_list(A)).
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presence_broadcast_first(From, StateData, Packet) ->
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{U, S, _} = From,
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?SETS:fold(fun(JID, X) ->
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ejabberd_router:route({U, S, ""}, JID,
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{xmlelement, "presence",
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[{"type", "probe"}],
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[]}),
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X
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end,
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[],
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StateData#state.pres_t),
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if
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StateData#state.pres_invis ->
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StateData;
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true ->
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As = ?SETS:fold(fun(JID, A) ->
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ejabberd_router:route(From, JID, Packet),
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?SETS:add_element(JID, A)
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end,
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StateData#state.pres_a,
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StateData#state.pres_f),
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StateData#state{pres_a = As}
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end.
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