Chapril/xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/mod_mix.erl
Christophe Romain bf45c9eeee Switch mix worker to transient
2016-08-01 14:09:16 +02:00

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%%%-------------------------------------------------------------------
%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% @copyright (C) 2016, Evgeny Khramtsov
%%% @doc
%%%
%%% @end
%%% Created : 2 Mar 2016 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%-------------------------------------------------------------------
-module(mod_mix).
-behaviour(gen_server).
-behaviour(gen_mod).
%% API
-export([start_link/2, start/2, stop/1, process_iq/3,
disco_items/5, disco_identity/5, disco_info/5,
disco_features/5, mod_opt_type/1, depends/2]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-include("logger.hrl").
-include("jlib.hrl").
-include("pubsub.hrl").
-define(PROCNAME, ejabberd_mod_mix).
-define(NODES, [?NS_MIX_NODES_MESSAGES,
?NS_MIX_NODES_PRESENCE,
?NS_MIX_NODES_PARTICIPANTS,
?NS_MIX_NODES_SUBJECT,
?NS_MIX_NODES_CONFIG]).
-record(state, {server_host :: binary(),
host :: binary()}).
%%%===================================================================
%%% API
%%%===================================================================
start_link(Host, Opts) ->
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
gen_server:start_link({local, Proc}, ?MODULE, [Host, Opts], []).
start(Host, Opts) ->
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
ChildSpec = {Proc, {?MODULE, start_link, [Host, Opts]},
transient, 5000, worker, [?MODULE]},
supervisor:start_child(ejabberd_sup, ChildSpec).
stop(Host) ->
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
supervisor:terminate_child(ejabberd_sup, Proc),
supervisor:delete_child(ejabberd_sup, Proc),
ok.
disco_features(_Acc, _From, _To, _Node, _Lang) ->
{result, [?NS_MIX_0]}.
disco_items(_Acc, _From, To, _Node, _Lang) when To#jid.luser /= <<"">> ->
To_s = jid:to_string(jid:remove_resource(To)),
{result, [#xmlel{name = <<"item">>,
attrs = [{<<"jid">>, To_s},
{<<"node">>, Node}]} || Node <- ?NODES]};
disco_items(_Acc, _From, _To, _Node, _Lang) ->
{result, []}.
disco_identity(Acc, _From, To, _Node, _Lang) when To#jid.luser == <<"">> ->
Acc ++ [#xmlel{name = <<"identity">>,
attrs =
[{<<"category">>, <<"conference">>},
{<<"name">>, <<"MIX service">>},
{<<"type">>, <<"text">>}]}];
disco_identity(Acc, _From, _To, _Node, _Lang) ->
Acc ++ [#xmlel{name = <<"identity">>,
attrs =
[{<<"category">>, <<"conference">>},
{<<"type">>, <<"mix">>}]}].
disco_info(_Acc, _From, To, _Node, _Lang) when is_atom(To) ->
[#xmlel{name = <<"x">>,
attrs = [{<<"xmlns">>, ?NS_XDATA},
{<<"type">>, <<"result">>}],
children = [#xmlel{name = <<"field">>,
attrs = [{<<"var">>, <<"FORM_TYPE">>},
{<<"type">>, <<"hidden">>}],
children = [#xmlel{name = <<"value">>,
children = [{xmlcdata,
?NS_MIX_SERVICEINFO_0}]}]}]}];
disco_info(Acc, _From, _To, _Node, _Lang) ->
Acc.
process_iq(From, To,
#iq{type = set, sub_el = #xmlel{name = <<"join">>} = SubEl} = IQ) ->
Nodes = lists:flatmap(
fun(#xmlel{name = <<"subscribe">>, attrs = Attrs}) ->
Node = fxml:get_attr_s(<<"node">>, Attrs),
case lists:member(Node, ?NODES) of
true -> [Node];
false -> []
end;
(_) ->
[]
end, SubEl#xmlel.children),
case subscribe_nodes(From, To, Nodes) of
{result, _} ->
case publish_participant(From, To) of
{result, _} ->
LFrom_s = jid:to_string(jid:tolower(jid:remove_resource(From))),
Subscribe = [#xmlel{name = <<"subscribe">>,
attrs = [{<<"node">>, Node}]} || Node <- Nodes],
IQ#iq{type = result,
sub_el = [#xmlel{name = <<"join">>,
attrs = [{<<"jid">>, LFrom_s},
{<<"xmlns">>, ?NS_MIX_0}],
children = Subscribe}]};
{error, Err} ->
IQ#iq{type = error, sub_el = [SubEl, Err]}
end;
{error, Err} ->
IQ#iq{type = error, sub_el = [SubEl, Err]}
end;
process_iq(From, To,
#iq{type = set, sub_el = #xmlel{name = <<"leave">>} = SubEl} = IQ) ->
case delete_participant(From, To) of
{result, _} ->
case unsubscribe_nodes(From, To, ?NODES) of
{result, _} ->
IQ#iq{type = result, sub_el = []};
{error, Err} ->
IQ#iq{type = error, sub_el = [SubEl, Err]}
end;
{error, Err} ->
IQ#iq{type = error, sub_el = [SubEl, Err]}
end;
process_iq(_From, _To, #iq{sub_el = SubEl, lang = Lang} = IQ) ->
Txt = <<"Unsupported MIX query">>,
IQ#iq{type = error, sub_el = [SubEl, ?ERRT_BAD_REQUEST(Lang, Txt)]}.
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
init([ServerHost, Opts]) ->
Host = gen_mod:get_opt_host(ServerHost, Opts, <<"mix.@HOST@">>),
IQDisc = gen_mod:get_opt(iqdisc, Opts, fun gen_iq_handler:check_type/1,
one_queue),
ConfigTab = gen_mod:get_module_proc(Host, config),
ets:new(ConfigTab, [named_table]),
ets:insert(ConfigTab, {plugins, [<<"mix">>]}),
ejabberd_hooks:add(disco_local_items, Host, ?MODULE, disco_items, 100),
ejabberd_hooks:add(disco_local_features, Host, ?MODULE, disco_features, 100),
ejabberd_hooks:add(disco_local_identity, Host, ?MODULE, disco_identity, 100),
ejabberd_hooks:add(disco_sm_items, Host, ?MODULE, disco_items, 100),
ejabberd_hooks:add(disco_sm_features, Host, ?MODULE, disco_features, 100),
ejabberd_hooks:add(disco_sm_identity, Host, ?MODULE, disco_identity, 100),
ejabberd_hooks:add(disco_info, Host, ?MODULE, disco_info, 100),
gen_iq_handler:add_iq_handler(ejabberd_local, Host,
?NS_DISCO_ITEMS, mod_disco,
process_local_iq_items, IQDisc),
gen_iq_handler:add_iq_handler(ejabberd_local, Host,
?NS_DISCO_INFO, mod_disco,
process_local_iq_info, IQDisc),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
?NS_DISCO_ITEMS, mod_disco,
process_local_iq_items, IQDisc),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
?NS_DISCO_INFO, mod_disco,
process_local_iq_info, IQDisc),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
?NS_PUBSUB, mod_pubsub, iq_sm, IQDisc),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
?NS_MIX_0, ?MODULE, process_iq, IQDisc),
ejabberd_router:register_route(Host, ServerHost),
{ok, #state{server_host = ServerHost, host = Host}}.
handle_call(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State}.
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info({route, From, To, Packet}, State) ->
case catch do_route(State, From, To, Packet) of
{'EXIT', _} = Err ->
try
?ERROR_MSG("failed to route packet ~p from '~s' to '~s': ~p",
[Packet, jid:to_string(From), jid:to_string(To), Err]),
ErrPkt = jlib:make_error_reply(Packet, ?ERR_INTERNAL_SERVER_ERROR),
ejabberd_router:route_error(To, From, ErrPkt, Packet)
catch _:_ ->
ok
end;
_ ->
ok
end,
{noreply, State};
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, #state{host = Host}) ->
ejabberd_hooks:delete(disco_local_items, Host, ?MODULE, disco_items, 100),
ejabberd_hooks:delete(disco_local_features, Host, ?MODULE, disco_features, 100),
ejabberd_hooks:delete(disco_local_identity, Host, ?MODULE, disco_identity, 100),
ejabberd_hooks:delete(disco_sm_items, Host, ?MODULE, disco_items, 100),
ejabberd_hooks:delete(disco_sm_features, Host, ?MODULE, disco_features, 100),
ejabberd_hooks:delete(disco_sm_identity, Host, ?MODULE, disco_identity, 100),
ejabberd_hooks:delete(disco_info, Host, ?MODULE, disco_info, 100),
gen_iq_handler:remove_iq_handler(ejabberd_local, Host, ?NS_DISCO_ITEMS),
gen_iq_handler:remove_iq_handler(ejabberd_local, Host, ?NS_DISCO_INFO),
gen_iq_handler:remove_iq_handler(ejabberd_sm, Host, ?NS_DISCO_ITEMS),
gen_iq_handler:remove_iq_handler(ejabberd_sm, Host, ?NS_DISCO_INFO),
gen_iq_handler:remove_iq_handler(ejabberd_sm, Host, ?NS_PUBSUB),
gen_iq_handler:remove_iq_handler(ejabberd_sm, Host, ?NS_MIX_0),
ejabberd_router:unregister_route(Host),
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
do_route(_State, From, To, #xmlel{name = <<"iq">>} = Packet) ->
if To#jid.luser == <<"">> ->
ejabberd_local:process_iq(From, To, Packet);
true ->
ejabberd_sm:process_iq(From, To, Packet)
end;
do_route(_State, From, To, #xmlel{name = <<"presence">>} = Packet)
when To#jid.luser /= <<"">> ->
case fxml:get_tag_attr_s(<<"type">>, Packet) of
<<"unavailable">> ->
delete_presence(From, To);
_ ->
ok
end;
do_route(_State, _From, _To, _Packet) ->
ok.
subscribe_nodes(From, To, Nodes) ->
LTo = jid:tolower(jid:remove_resource(To)),
LFrom = jid:tolower(jid:remove_resource(From)),
From_s = jid:to_string(LFrom),
lists:foldl(
fun(_Node, {error, _} = Err) ->
Err;
(Node, {result, _}) ->
case mod_pubsub:subscribe_node(LTo, Node, From, From_s, []) of
{error, _} = Err ->
case is_item_not_found(Err) of
true ->
case mod_pubsub:create_node(
LTo, To#jid.lserver, Node, LFrom, <<"mix">>) of
{result, _} ->
mod_pubsub:subscribe_node(LTo, Node, From, From_s, []);
Error ->
Error
end;
false ->
Err
end;
{result, _} = Result ->
Result
end
end, {result, []}, Nodes).
unsubscribe_nodes(From, To, Nodes) ->
LTo = jid:tolower(jid:remove_resource(To)),
LFrom = jid:tolower(jid:remove_resource(From)),
From_s = jid:to_string(LFrom),
lists:foldl(
fun(_Node, {error, _} = Err) ->
Err;
(Node, {result, _} = Result) ->
case mod_pubsub:unsubscribe_node(LTo, Node, From, From_s, <<"">>) of
{error, _} = Err ->
case is_not_subscribed(Err) of
true -> Result;
_ -> Err
end;
{result, _} = Res ->
Res
end
end, {result, []}, Nodes).
publish_participant(From, To) ->
LFrom = jid:tolower(jid:remove_resource(From)),
LTo = jid:tolower(jid:remove_resource(To)),
Participant = #xmlel{name = <<"participant">>,
attrs = [{<<"xmlns">>, ?NS_MIX_0},
{<<"jid">>, jid:to_string(LFrom)}]},
ItemID = p1_sha:sha(jid:to_string(LFrom)),
mod_pubsub:publish_item(
LTo, To#jid.lserver, ?NS_MIX_NODES_PARTICIPANTS,
From, ItemID, [Participant]).
delete_presence(From, To) ->
LFrom = jid:tolower(From),
LTo = jid:tolower(jid:remove_resource(To)),
case mod_pubsub:get_items(LTo, ?NS_MIX_NODES_PRESENCE) of
Items when is_list(Items) ->
lists:foreach(
fun(#pubsub_item{modification = {_, LJID},
itemid = {ItemID, _}}) when LJID == LFrom ->
delete_item(From, To, ?NS_MIX_NODES_PRESENCE, ItemID);
(_) ->
ok
end, Items);
_ ->
ok
end.
delete_participant(From, To) ->
LFrom = jid:tolower(jid:remove_resource(From)),
ItemID = p1_sha:sha(jid:to_string(LFrom)),
delete_presence(From, To),
delete_item(From, To, ?NS_MIX_NODES_PARTICIPANTS, ItemID).
delete_item(From, To, Node, ItemID) ->
LTo = jid:tolower(jid:remove_resource(To)),
case mod_pubsub:delete_item(
LTo, Node, From, ItemID, true) of
{result, _} = Res ->
Res;
{error, _} = Err ->
case is_item_not_found(Err) of
true -> {result, []};
false -> Err
end
end.
is_item_not_found({error, ErrEl}) ->
case fxml:get_subtag_with_xmlns(
ErrEl, <<"item-not-found">>, ?NS_STANZAS) of
#xmlel{} -> true;
_ -> false
end.
is_not_subscribed({error, ErrEl}) ->
case fxml:get_subtag_with_xmlns(
ErrEl, <<"not-subscribed">>, ?NS_PUBSUB_ERRORS) of
#xmlel{} -> true;
_ -> false
end.
depends(_Host, _Opts) ->
[{mod_pubsub, hard}].
mod_opt_type(iqdisc) -> fun gen_iq_handler:check_type/1;
mod_opt_type(host) -> fun iolist_to_binary/1;
mod_opt_type(_) -> [host, iqdisc].
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