Chapril/xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/mod_disco.erl

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%%%----------------------------------------------------------------------
%%% File : mod_disco.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Service Discovery (XEP-0030) support
%%% Created : 1 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2015 ProcessOne
%%%
%%% 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.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
-module(mod_disco).
-author('alexey@process-one.net').
-behaviour(gen_mod).
-export([start/2, stop/1, process_local_iq_items/3,
process_local_iq_info/3, get_local_identity/5,
get_local_features/5, get_local_services/5,
process_sm_iq_items/3, process_sm_iq_info/3,
get_sm_identity/5, get_sm_features/5, get_sm_items/5,
get_info/5, register_feature/2, unregister_feature/2,
register_extra_domain/2, unregister_extra_domain/2,
transform_module_options/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
-include("jlib.hrl").
-include("mod_roster.hrl").
start(Host, Opts) ->
ejabberd_local:refresh_iq_handlers(),
IQDisc = gen_mod:get_opt(iqdisc, Opts, fun gen_iq_handler:check_type/1,
one_queue),
gen_iq_handler:add_iq_handler(ejabberd_local, Host,
?NS_DISCO_ITEMS, ?MODULE,
process_local_iq_items, IQDisc),
gen_iq_handler:add_iq_handler(ejabberd_local, Host,
?NS_DISCO_INFO, ?MODULE,
process_local_iq_info, IQDisc),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
?NS_DISCO_ITEMS, ?MODULE, process_sm_iq_items,
IQDisc),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
?NS_DISCO_INFO, ?MODULE, process_sm_iq_info,
IQDisc),
catch ets:new(disco_features,
[named_table, ordered_set, public]),
register_feature(Host, <<"iq">>),
register_feature(Host, <<"presence">>),
catch ets:new(disco_extra_domains,
[named_table, ordered_set, public]),
ExtraDomains = gen_mod:get_opt(extra_domains, Opts,
fun(Hs) ->
[iolist_to_binary(H) || H <- Hs]
end, []),
lists:foreach(fun (Domain) ->
register_extra_domain(Host, Domain)
end,
ExtraDomains),
catch ets:new(disco_sm_features,
[named_table, ordered_set, public]),
catch ets:new(disco_sm_nodes,
[named_table, ordered_set, public]),
ejabberd_hooks:add(disco_local_items, Host, ?MODULE,
get_local_services, 100),
ejabberd_hooks:add(disco_local_features, Host, ?MODULE,
get_local_features, 100),
ejabberd_hooks:add(disco_local_identity, Host, ?MODULE,
get_local_identity, 100),
ejabberd_hooks:add(disco_sm_items, Host, ?MODULE,
get_sm_items, 100),
ejabberd_hooks:add(disco_sm_features, Host, ?MODULE,
get_sm_features, 100),
ejabberd_hooks:add(disco_sm_identity, Host, ?MODULE,
get_sm_identity, 100),
ejabberd_hooks:add(disco_info, Host, ?MODULE, get_info,
100),
ok.
stop(Host) ->
ejabberd_hooks:delete(disco_sm_identity, Host, ?MODULE,
get_sm_identity, 100),
ejabberd_hooks:delete(disco_sm_features, Host, ?MODULE,
get_sm_features, 100),
ejabberd_hooks:delete(disco_sm_items, Host, ?MODULE,
get_sm_items, 100),
ejabberd_hooks:delete(disco_local_identity, Host,
?MODULE, get_local_identity, 100),
ejabberd_hooks:delete(disco_local_features, Host,
?MODULE, get_local_features, 100),
ejabberd_hooks:delete(disco_local_items, Host, ?MODULE,
get_local_services, 100),
ejabberd_hooks:delete(disco_info, Host, ?MODULE,
get_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),
catch ets:match_delete(disco_features, {{'_', Host}}),
catch ets:match_delete(disco_extra_domains,
{{'_', Host}}),
ok.
register_feature(Host, Feature) ->
catch ets:new(disco_features,
[named_table, ordered_set, public]),
ets:insert(disco_features, {{Feature, Host}}).
unregister_feature(Host, Feature) ->
catch ets:new(disco_features,
[named_table, ordered_set, public]),
ets:delete(disco_features, {Feature, Host}).
register_extra_domain(Host, Domain) ->
catch ets:new(disco_extra_domains,
[named_table, ordered_set, public]),
ets:insert(disco_extra_domains, {{Domain, Host}}).
unregister_extra_domain(Host, Domain) ->
catch ets:new(disco_extra_domains,
[named_table, ordered_set, public]),
ets:delete(disco_extra_domains, {Domain, Host}).
process_local_iq_items(From, To,
#iq{type = Type, lang = Lang, sub_el = SubEl} = IQ) ->
case Type of
set ->
IQ#iq{type = error, sub_el = [SubEl, ?ERR_NOT_ALLOWED]};
get ->
Node = xml:get_tag_attr_s(<<"node">>, SubEl),
Host = To#jid.lserver,
case ejabberd_hooks:run_fold(disco_local_items, Host,
empty, [From, To, Node, Lang])
of
{result, Items} ->
ANode = case Node of
<<"">> -> [];
_ -> [{<<"node">>, Node}]
end,
IQ#iq{type = result,
sub_el =
[#xmlel{name = <<"query">>,
attrs =
[{<<"xmlns">>, ?NS_DISCO_ITEMS} | ANode],
children = Items}]};
{error, Error} ->
IQ#iq{type = error, sub_el = [SubEl, Error]}
end
end.
process_local_iq_info(From, To,
#iq{type = Type, lang = Lang, sub_el = SubEl} = IQ) ->
case Type of
set ->
IQ#iq{type = error, sub_el = [SubEl, ?ERR_NOT_ALLOWED]};
get ->
Host = To#jid.lserver,
Node = xml:get_tag_attr_s(<<"node">>, SubEl),
Identity = ejabberd_hooks:run_fold(disco_local_identity,
Host, [], [From, To, Node, Lang]),
Info = ejabberd_hooks:run_fold(disco_info, Host, [],
[Host, ?MODULE, Node, Lang]),
case ejabberd_hooks:run_fold(disco_local_features, Host,
empty, [From, To, Node, Lang])
of
{result, Features} ->
ANode = case Node of
<<"">> -> [];
_ -> [{<<"node">>, Node}]
end,
IQ#iq{type = result,
sub_el =
[#xmlel{name = <<"query">>,
attrs =
[{<<"xmlns">>, ?NS_DISCO_INFO} | ANode],
children =
Identity ++
Info ++ features_to_xml(Features)}]};
{error, Error} ->
IQ#iq{type = error, sub_el = [SubEl, Error]}
end
end.
get_local_identity(Acc, _From, _To, <<>>, _Lang) ->
Acc ++
[#xmlel{name = <<"identity">>,
attrs =
[{<<"category">>, <<"server">>}, {<<"type">>, <<"im">>},
{<<"name">>, <<"ejabberd">>}],
children = []}];
get_local_identity(Acc, _From, _To, _Node, _Lang) ->
Acc.
get_local_features({error, _Error} = Acc, _From, _To,
_Node, _Lang) ->
Acc;
get_local_features(Acc, _From, To, <<>>, _Lang) ->
Feats = case Acc of
{result, Features} -> Features;
empty -> []
end,
Host = To#jid.lserver,
{result,
ets:select(disco_features,
[{{{'_', Host}}, [], ['$_']}])
++ Feats};
get_local_features(Acc, _From, _To, _Node, _Lang) ->
case Acc of
{result, _Features} -> Acc;
empty -> {error, ?ERR_ITEM_NOT_FOUND}
end.
features_to_xml(FeatureList) ->
[#xmlel{name = <<"feature">>,
attrs = [{<<"var">>, Feat}], children = []}
|| Feat
<- lists:usort(lists:map(fun ({{Feature, _Host}}) ->
Feature;
(Feature) when is_binary(Feature) ->
Feature
end,
FeatureList))].
domain_to_xml({Domain}) ->
#xmlel{name = <<"item">>, attrs = [{<<"jid">>, Domain}],
children = []};
domain_to_xml(Domain) ->
#xmlel{name = <<"item">>, attrs = [{<<"jid">>, Domain}],
children = []}.
get_local_services({error, _Error} = Acc, _From, _To,
_Node, _Lang) ->
Acc;
get_local_services(Acc, _From, To, <<>>, _Lang) ->
Items = case Acc of
{result, Its} -> Its;
empty -> []
end,
Host = To#jid.lserver,
{result,
lists:usort(lists:map(fun domain_to_xml/1,
get_vh_services(Host) ++
ets:select(disco_extra_domains,
[{{{'$1', Host}}, [], ['$1']}])))
++ Items};
get_local_services({result, _} = Acc, _From, _To, _Node,
_Lang) ->
Acc;
get_local_services(empty, _From, _To, _Node, _Lang) ->
{error, ?ERR_ITEM_NOT_FOUND}.
get_vh_services(Host) ->
Hosts = lists:sort(fun (H1, H2) ->
byte_size(H1) >= byte_size(H2)
end,
?MYHOSTS),
lists:filter(fun (H) ->
case lists:dropwhile(fun (VH) ->
not
str:suffix(
<<".", VH/binary>>,
H)
end,
Hosts)
of
[] -> false;
[VH | _] -> VH == Host
end
end,
ejabberd_router:dirty_get_all_routes()).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
process_sm_iq_items(From, To,
#iq{type = Type, lang = Lang, sub_el = SubEl} = IQ) ->
case Type of
set ->
IQ#iq{type = error, sub_el = [SubEl, ?ERR_NOT_ALLOWED]};
get ->
case is_presence_subscribed(From, To) of
true ->
Host = To#jid.lserver,
Node = xml:get_tag_attr_s(<<"node">>, SubEl),
case ejabberd_hooks:run_fold(disco_sm_items, Host,
empty, [From, To, Node, Lang])
of
{result, Items} ->
ANode = case Node of
<<"">> -> [];
_ -> [{<<"node">>, Node}]
end,
IQ#iq{type = result,
sub_el =
[#xmlel{name = <<"query">>,
attrs =
[{<<"xmlns">>, ?NS_DISCO_ITEMS}
| ANode],
children = Items}]};
{error, Error} ->
IQ#iq{type = error, sub_el = [SubEl, Error]}
end;
false ->
IQ#iq{type = error,
sub_el = [SubEl, ?ERR_SERVICE_UNAVAILABLE]}
end
end.
get_sm_items({error, _Error} = Acc, _From, _To, _Node,
_Lang) ->
Acc;
get_sm_items(Acc, From,
#jid{user = User, server = Server} = To, <<>>, _Lang) ->
Items = case Acc of
{result, Its} -> Its;
empty -> []
end,
Items1 = case is_presence_subscribed(From, To) of
true -> get_user_resources(User, Server);
_ -> []
end,
{result, Items ++ Items1};
get_sm_items({result, _} = Acc, _From, _To, _Node,
_Lang) ->
Acc;
get_sm_items(empty, From, To, _Node, _Lang) ->
#jid{luser = LFrom, lserver = LSFrom} = From,
#jid{luser = LTo, lserver = LSTo} = To,
case {LFrom, LSFrom} of
{LTo, LSTo} -> {error, ?ERR_ITEM_NOT_FOUND};
_ -> {error, ?ERR_NOT_ALLOWED}
end.
is_presence_subscribed(#jid{luser = User,
lserver = Server},
#jid{luser = LUser, lserver = LServer}) ->
lists:any(fun (#roster{jid = {TUser, TServer, _},
subscription = S}) ->
if LUser == TUser, LServer == TServer, S /= none ->
true;
true -> false
end
end,
ejabberd_hooks:run_fold(roster_get, Server, [],
[{User, Server}]))
orelse User == LUser andalso Server == LServer.
process_sm_iq_info(From, To,
#iq{type = Type, lang = Lang, sub_el = SubEl} = IQ) ->
case Type of
set ->
IQ#iq{type = error, sub_el = [SubEl, ?ERR_NOT_ALLOWED]};
get ->
case is_presence_subscribed(From, To) of
true ->
Host = To#jid.lserver,
Node = xml:get_tag_attr_s(<<"node">>, SubEl),
Identity = ejabberd_hooks:run_fold(disco_sm_identity,
Host, [],
[From, To, Node, Lang]),
case ejabberd_hooks:run_fold(disco_sm_features, Host,
empty, [From, To, Node, Lang])
of
{result, Features} ->
ANode = case Node of
<<"">> -> [];
_ -> [{<<"node">>, Node}]
end,
IQ#iq{type = result,
sub_el =
[#xmlel{name = <<"query">>,
attrs =
[{<<"xmlns">>, ?NS_DISCO_INFO}
| ANode],
children =
Identity ++
features_to_xml(Features)}]};
{error, Error} ->
IQ#iq{type = error, sub_el = [SubEl, Error]}
end;
false ->
IQ#iq{type = error,
sub_el = [SubEl, ?ERR_SERVICE_UNAVAILABLE]}
end
end.
get_sm_identity(Acc, _From,
#jid{luser = LUser, lserver = LServer}, _Node, _Lang) ->
Acc ++
case ejabberd_auth:is_user_exists(LUser, LServer) of
true ->
[#xmlel{name = <<"identity">>,
attrs =
[{<<"category">>, <<"account">>},
{<<"type">>, <<"registered">>}],
children = []}];
_ -> []
end.
get_sm_features(empty, From, To, _Node, _Lang) ->
#jid{luser = LFrom, lserver = LSFrom} = From,
#jid{luser = LTo, lserver = LSTo} = To,
case {LFrom, LSFrom} of
{LTo, LSTo} -> {error, ?ERR_ITEM_NOT_FOUND};
_ -> {error, ?ERR_NOT_ALLOWED}
end;
get_sm_features(Acc, _From, _To, _Node, _Lang) -> Acc.
get_user_resources(User, Server) ->
Rs = ejabberd_sm:get_user_resources(User, Server),
lists:map(fun (R) ->
#xmlel{name = <<"item">>,
attrs =
[{<<"jid">>,
<<User/binary, "@", Server/binary, "/",
R/binary>>},
{<<"name">>, User}],
children = []}
end,
lists:sort(Rs)).
transform_module_options(Opts) ->
lists:map(
fun({server_info, Infos}) ->
NewInfos = lists:map(
fun({Modules, Name, URLs}) ->
[[{modules, Modules},
{name, Name},
{urls, URLs}]];
(Opt) ->
Opt
end, Infos),
{server_info, NewInfos};
(Opt) ->
Opt
end, Opts).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Support for: XEP-0157 Contact Addresses for XMPP Services
get_info(_A, Host, Mod, Node, _Lang) when Node == <<>> ->
Module = case Mod of
undefined -> ?MODULE;
_ -> Mod
end,
Serverinfo_fields = get_fields_xml(Host, Module),
[#xmlel{name = <<"x">>,
attrs =
[{<<"xmlns">>, ?NS_XDATA}, {<<"type">>, <<"result">>}],
children =
[#xmlel{name = <<"field">>,
attrs =
[{<<"var">>, <<"FORM_TYPE">>},
{<<"type">>, <<"hidden">>}],
children =
[#xmlel{name = <<"value">>, attrs = [],
children = [{xmlcdata, ?NS_SERVERINFO}]}]}]
++ Serverinfo_fields}];
get_info(Acc, _, _, _Node, _) -> Acc.
get_fields_xml(Host, Module) ->
Fields = gen_mod:get_module_opt(
Host, ?MODULE, server_info,
fun(L) ->
lists:map(
fun(Opts) ->
Mods = proplists:get_value(modules, Opts, all),
Name = proplists:get_value(name, Opts, <<>>),
URLs = proplists:get_value(urls, Opts, []),
{Mods, Name, URLs}
end, L)
end, []),
Fields_good = lists:filter(fun ({Modules, _, _}) ->
case Modules of
all -> true;
Modules ->
lists:member(Module, Modules)
end
end,
Fields),
fields_to_xml(Fields_good).
fields_to_xml(Fields) ->
[field_to_xml(Field) || Field <- Fields].
field_to_xml({_, Var, Values}) ->
Values_xml = values_to_xml(Values),
#xmlel{name = <<"field">>, attrs = [{<<"var">>, Var}],
children = Values_xml}.
values_to_xml(Values) ->
lists:map(fun (Value) ->
#xmlel{name = <<"value">>, attrs = [],
children = [{xmlcdata, Value}]}
end,
Values).
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