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xmpp.chapril.org-ejabberd/src/web/ejabberd_http_poll.erl

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Erlang
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%%%----------------------------------------------------------------------
%%% File : ejabberd_http_poll.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : HTTP Polling support (JEP-0025)
%%% Created : 4 Mar 2004 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2007 Process-one
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_http_poll).
-author('alexey@process-one.net').
-behaviour(gen_fsm).
%% External exports
-export([start_link/2,
init/1,
handle_event/3,
handle_sync_event/4,
code_change/4,
handle_info/3,
terminate/3,
send/2,
setopts/2,
sockname/1, peername/1,
controlling_process/2,
close/1,
process/2]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-include("ejabberd_http.hrl").
-record(http_poll, {id, pid}).
-record(state, {id,
key,
output = "",
input = "",
waiting_input = false, %% {ReceiverPid, Tag}
last_receiver,
timer}).
%-define(DBGFSM, true).
-ifdef(DBGFSM).
-define(FSMOPTS, [{debug, [trace]}]).
-else.
-define(FSMOPTS, []).
-endif.
-define(HTTP_POLL_TIMEOUT, 300000).
-define(CT, {"Content-Type", "text/xml; charset=utf-8"}).
-define(BAD_REQUEST, [?CT, {"Set-Cookie", "ID=-3:0; expires=-1"}]).
%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------
start(ID, Key) ->
mnesia:create_table(http_poll,
[{ram_copies, [node()]},
{attributes, record_info(fields, http_poll)}]),
supervisor:start_child(ejabberd_http_poll_sup, [ID, Key]).
start_link(ID, Key) ->
gen_fsm:start_link(?MODULE, [ID, Key], ?FSMOPTS).
send({http_poll, FsmRef}, Packet) ->
gen_fsm:sync_send_all_state_event(FsmRef, {send, Packet}).
setopts({http_poll, FsmRef}, Opts) ->
case lists:member({active, once}, Opts) of
true ->
gen_fsm:send_all_state_event(FsmRef, {activate, self()});
_ ->
ok
end.
sockname(_Socket) ->
{ok, {{0, 0, 0, 0}, 0}}.
peername(_Socket) ->
{ok, {{0, 0, 0, 0}, 0}}.
controlling_process(_Socket, _Pid) ->
ok.
close({http_poll, FsmRef}) ->
catch gen_fsm:sync_send_all_state_event(FsmRef, close).
process([], #request{data = Data} = _Request) ->
case catch parse_request(Data) of
{ok, ID1, Key, NewKey, Packet} ->
ID = if
(ID1 == "0") or (ID1 == "mobile") ->
NewID = sha:sha(term_to_binary({now(), make_ref()})),
{ok, Pid} = start(NewID, ""),
mnesia:transaction(
fun() ->
mnesia:write(#http_poll{id = NewID,
pid = Pid})
end),
NewID;
true ->
ID1
end,
case http_put(ID, Key, NewKey, Packet) of
{error, not_exists} ->
{200, ?BAD_REQUEST, ""};
{error, bad_key} ->
{200, ?BAD_REQUEST, ""};
ok ->
receive
after 100 -> ok
end,
case http_get(ID) of
{error, not_exists} ->
{200, [?BAD_REQUEST], ""};
{ok, OutPacket} ->
if
ID == ID1 ->
Cookie = "ID=" ++ ID ++ "; expires=-1",
{200, [?CT, {"Set-Cookie", Cookie}],
OutPacket};
ID1 == "mobile" ->
{200, [?CT], [ID, $\n, OutPacket]};
true ->
Cookie = "ID=" ++ ID ++ "; expires=-1",
{200, [?CT, {"Set-Cookie", Cookie}],
OutPacket}
end
end
end;
_ ->
{200, [?CT, {"Set-Cookie", "ID=-2:0; expires=-1"}], ""}
end;
process(_, _Request) ->
{400, [], {xmlelement, "h1", [],
[{xmlcdata, "400 Bad Request"}]}}.
%%%----------------------------------------------------------------------
%%% Callback functions from gen_fsm
%%%----------------------------------------------------------------------
%%----------------------------------------------------------------------
%% Func: init/1
%% Returns: {ok, StateName, StateData} |
%% {ok, StateName, StateData, Timeout} |
%% ignore |
%% {stop, StopReason}
%%----------------------------------------------------------------------
init([ID, Key]) ->
?INFO_MSG("started: ~p", [{ID, Key}]),
%% Read c2s options from the first ejabberd_c2s configuration in
%% the config file listen section
%% TODO: We should have different access and shaper values for
%% each connector. The default behaviour should be however to use
%% the default c2s restrictions if not defined for the current
%% connector.
Opts = ejabberd_c2s_config:get_c2s_limits(),
ejabberd_socket:start(ejabberd_c2s, ?MODULE, {http_poll, self()}, Opts),
%{ok, C2SPid} = ejabberd_c2s:start({?MODULE, {http_poll, self()}}, Opts),
%ejabberd_c2s:become_controller(C2SPid),
Timer = erlang:start_timer(?HTTP_POLL_TIMEOUT, self(), []),
{ok, loop, #state{id = ID,
key = Key,
timer = Timer}}.
%%----------------------------------------------------------------------
%% Func: StateName/2
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData}
%%----------------------------------------------------------------------
%%----------------------------------------------------------------------
%% Func: StateName/3
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {reply, Reply, NextStateName, NextStateData} |
%% {reply, Reply, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData} |
%% {stop, Reason, Reply, NewStateData}
%%----------------------------------------------------------------------
%state_name(Event, From, StateData) ->
% Reply = ok,
% {reply, Reply, state_name, StateData}.
%%----------------------------------------------------------------------
%% Func: handle_event/3
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData}
%%----------------------------------------------------------------------
handle_event({activate, From}, StateName, StateData) ->
case StateData#state.input of
"" ->
{next_state, StateName,
StateData#state{waiting_input = {From, ok}}};
Input ->
Receiver = From,
Receiver ! {tcp, {http_poll, self()}, list_to_binary(Input)},
{next_state, StateName, StateData#state{input = "",
waiting_input = false,
last_receiver = Receiver
}}
end;
handle_event(_Event, StateName, StateData) ->
{next_state, StateName, StateData}.
%%----------------------------------------------------------------------
%% Func: handle_sync_event/4
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {reply, Reply, NextStateName, NextStateData} |
%% {reply, Reply, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData} |
%% {stop, Reason, Reply, NewStateData}
%%----------------------------------------------------------------------
handle_sync_event({send, Packet}, _From, StateName, StateData) ->
Output = StateData#state.output ++ [lists:flatten(Packet)],
Reply = ok,
{reply, Reply, StateName, StateData#state{output = Output}};
handle_sync_event(stop, _From, _StateName, StateData) ->
Reply = ok,
{stop, normal, Reply, StateData};
handle_sync_event({http_put, Key, NewKey, Packet},
_From, StateName, StateData) ->
Allow = case StateData#state.key of
"" ->
true;
OldKey ->
NextKey = jlib:encode_base64(
binary_to_list(crypto:sha(Key))),
if
OldKey == NextKey ->
true;
true ->
false
end
end,
if
Allow ->
case StateData#state.waiting_input of
false ->
Input = [StateData#state.input|Packet],
Reply = ok,
{reply, Reply, StateName, StateData#state{input = Input,
key = NewKey}};
{Receiver, _Tag} ->
Receiver ! {tcp, {http_poll, self()},
list_to_binary(Packet)},
cancel_timer(StateData#state.timer),
Timer = erlang:start_timer(?HTTP_POLL_TIMEOUT, self(), []),
Reply = ok,
{reply, Reply, StateName,
StateData#state{waiting_input = false,
last_receiver = Receiver,
key = NewKey,
timer = Timer}}
end;
true ->
Reply = {error, bad_key},
{reply, Reply, StateName, StateData}
end;
handle_sync_event(http_get, _From, StateName, StateData) ->
Reply = {ok, StateData#state.output},
{reply, Reply, StateName, StateData#state{output = ""}};
handle_sync_event(_Event, _From, StateName, StateData) ->
Reply = ok,
{reply, Reply, StateName, StateData}.
code_change(_OldVsn, StateName, StateData, _Extra) ->
{ok, StateName, StateData}.
%%----------------------------------------------------------------------
%% Func: handle_info/3
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData}
%%----------------------------------------------------------------------
handle_info({timeout, Timer, _}, _StateName,
#state{timer = Timer} = StateData) ->
{stop, normal, StateData};
handle_info(_, StateName, StateData) ->
{next_state, StateName, StateData}.
%%----------------------------------------------------------------------
%% Func: terminate/3
%% Purpose: Shutdown the fsm
%% Returns: any
%%----------------------------------------------------------------------
terminate(_Reason, _StateName, StateData) ->
mnesia:transaction(
fun() ->
mnesia:delete({http_poll, StateData#state.id})
end),
case StateData#state.waiting_input of
false ->
%% We are testing this case due to "socket activation": If we pass
%% here and the "socket" is not ready to receive, the tcp_closed
%% will be lost.
case StateData#state.last_receiver of
undefined -> ok;
Receiver ->
Receiver ! {tcp_closed, {http_poll, self()}}
end;
{Receiver, _Tag} ->
Receiver ! {tcp_closed, {http_poll, self()}}
end,
catch resend_messages(StateData#state.output),
ok.
%%%----------------------------------------------------------------------
%%% Internal functions
%%%----------------------------------------------------------------------
http_put(ID, Key, NewKey, Packet) ->
case mnesia:dirty_read({http_poll, ID}) of
[] ->
{error, not_exists};
[#http_poll{pid = FsmRef}] ->
gen_fsm:sync_send_all_state_event(
FsmRef, {http_put, Key, NewKey, Packet})
end.
http_get(ID) ->
case mnesia:dirty_read({http_poll, ID}) of
[] ->
{error, not_exists};
[#http_poll{pid = FsmRef}] ->
gen_fsm:sync_send_all_state_event(FsmRef, http_get)
end.
parse_request(Data) ->
Comma = string:chr(Data, $,),
Header = lists:sublist(Data, Comma - 1),
Packet = lists:nthtail(Comma, Data),
{ID, Key, NewKey} =
case string:tokens(Header, ";") of
[ID1] ->
{ID1, "", ""};
[ID1, Key1] ->
{ID1, Key1, Key1};
[ID1, Key1, NewKey1] ->
{ID1, Key1, NewKey1}
end,
{ok, ID, Key, NewKey, Packet}.
cancel_timer(Timer) ->
erlang:cancel_timer(Timer),
receive
{timeout, Timer, _} ->
ok
after 0 ->
ok
end.
%% Resend the polled messages
resend_messages(Messages) ->
lists:foreach(fun(Packet) ->
resend_message(Packet)
end, Messages).
%% This function is used to resend messages that have been polled but not
%% delivered.
resend_message(Packet) ->
ParsedPacket = xml_stream:parse_element(Packet),
From = get_jid("from", ParsedPacket),
To = get_jid("to", ParsedPacket),
io:format("MREMOND: Resend ~p ~p ~p~n",[From,To, ParsedPacket]),
ejabberd_router:route(From, To, ParsedPacket).
%% Type can be "from" or "to"
%% Parsed packet is a parsed Jabber packet.
get_jid(Type, ParsedPacket) ->
case xml:get_tag_attr(Type, ParsedPacket) of
{value, StringJid} ->
jlib:string_to_jid(StringJid);
false ->
jlib:make_jid("","","")
end.
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