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

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%%%----------------------------------------------------------------------
%%% File : mod_disco.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose : Service Discovery (JEP-0030) support
%%% Created : 1 Jan 2003 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(mod_disco).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').
-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_publish_items/5,
register_feature/2,
unregister_feature/2,
register_extra_domain/2,
unregister_extra_domain/2]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-record(disco_publish, {owner_node, jid, name, node}).
start(Host, Opts) ->
mnesia:create_table(disco_publish,
[{disc_only_copies, [node()]},
{attributes, record_info(fields, disco_publish)},
{type, bag}]),
mnesia:add_table_index(disco_publish, owner_node),
ejabberd_local:refresh_iq_handlers(),
IQDisc = gen_mod:get_opt(iqdisc, Opts, 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"),
register_feature(Host, "presence-invisible"),
register_feature(Host, "http://jabber.org/protocol/disco#publish"),
catch ets:new(disco_extra_domains, [named_table, ordered_set, public]),
ExtraDomains = gen_mod:get_opt(extra_domains, Opts, []),
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_sm_items, Host, ?MODULE, get_publish_items, 75),
ok.
stop(Host) ->
ejabberd_hooks:delete(disco_sm_items, Host, ?MODULE, get_publish_items, 75),
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),
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 = [{xmlelement, "query",
[{"xmlns", ?NS_DISCO_ITEMS} | ANode],
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]),
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 = [{xmlelement, "query",
[{"xmlns", ?NS_DISCO_INFO} | ANode],
Identity ++
lists:map(fun feature_to_xml/1, Features)
}]};
{error, Error} ->
IQ#iq{type = error, sub_el = [SubEl, Error]}
end
end.
get_local_identity(_Acc, _From, _To, [], _Lang) ->
[{xmlelement, "identity",
[{"category", "server"},
{"type", "im"},
{"name", "ejabberd"}], []}];
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.
feature_to_xml({{Feature, _Host}}) ->
feature_to_xml(Feature);
feature_to_xml(Feature) when is_list(Feature) ->
{xmlelement, "feature", [{"var", Feature}], []}.
domain_to_xml({Domain}) ->
{xmlelement, "item", [{"jid", Domain}], []};
domain_to_xml(Domain) ->
{xmlelement, "item", [{"jid", Domain}], []}.
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) -> length(H1) >= length(H2) end, ?MYHOSTS),
lists:filter(fun(H) ->
case lists:dropwhile(
fun(VH) ->
not lists:suffix("." ++ VH, 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 ->
#jid{luser = LTo, lserver = ToServer} = To,
#jid{luser = LFrom, lserver = LServer} = From,
Self = (LTo == LFrom) andalso (ToServer == LServer),
Node = xml:get_tag_attr_s("node", SubEl),
if
Self, Node /= [] ->
%% Here, we treat disco publish attempts to your own JID.
{xmlelement, _, _, Items} = SubEl,
case process_disco_publish({LFrom, LServer}, Node, Items) of
ok ->
IQ#iq{type = result, sub_el = []};
{error, Err} ->
IQ#iq{type = error, sub_el = [SubEl, Err]}
end;
true ->
IQ#iq{type = error, sub_el = [SubEl, ?ERR_NOT_ALLOWED]}
end;
get ->
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 = [{xmlelement, "query",
[{"xmlns", ?NS_DISCO_ITEMS} | ANode],
Items
}]};
{error, Error} ->
IQ#iq{type = error, sub_el = [SubEl, Error]}
end
end.
get_sm_items({error, _Error} = Acc, _From, _To, _Node, _Lang) ->
Acc;
get_sm_items(Acc,
#jid{luser = LFrom, lserver = LSFrom},
#jid{user = User, server = Server, luser = LTo, lserver = LSTo} = _To,
[], _Lang) ->
Items = case Acc of
{result, Its} -> Its;
empty -> []
end,
Items1 = case {LFrom, LSFrom} of
{LTo, LSTo} -> 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.
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 ->
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 = [{xmlelement, "query",
[{"xmlns", ?NS_DISCO_INFO} | ANode],
Identity ++
lists:map(fun feature_to_xml/1, Features)
}]};
{error, Error} ->
IQ#iq{type = error, sub_el = [SubEl, Error]}
end
end.
get_sm_identity(Acc, _From, _To, _Node, _Lang) ->
Acc.
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) ->
{xmlelement, "item",
[{"jid", User ++ "@" ++ Server ++ "/" ++ R},
{"name", User}], []}
end, lists:sort(Rs)).
get_publish_items(empty,
#jid{luser = LFrom, lserver = LSFrom},
#jid{luser = LTo, lserver = LSTo} = _To,
Node, _Lang) ->
if
(LFrom == LTo) and (LSFrom == LSTo) ->
retrieve_disco_publish({LTo, LSTo}, Node);
true ->
empty
end;
get_publish_items(Acc, _From, _To, _Node, _Lang) ->
Acc.
process_disco_publish(User, Node, Items) ->
F = fun() ->
lists:foreach(
fun({xmlelement, _Name, _Attrs, _SubEls} = Item) ->
Action = xml:get_tag_attr_s("action", Item),
Jid = xml:get_tag_attr_s("jid", Item),
PNode = xml:get_tag_attr_s("node", Item),
Name = xml:get_tag_attr_s("name", Item),
?INFO_MSG("Disco publish: ~p ~p ~p ~p ~p ~p~n",
[User, Action, Node, Jid, PNode, Name]),
%% The disco_publish table isn't strictly a "bag" table, as
%% entries with same jid and node combination are considered
%% the same, even if they have different names. Therefore,
%% we find a list of items to supersede.
SupersededItems = mnesia:match_object(
#disco_publish{owner_node = {User, Node},
jid = Jid,
node = PNode,
_ = '_'}),
case Action of
"update" ->
lists:map(
fun(O) ->
mnesia:delete_object(O)
end, SupersededItems),
mnesia:write(
#disco_publish{owner_node = {User, Node},
jid = Jid,
name = Name,
node = PNode});
"remove" ->
case SupersededItems of
[] ->
mnesia:abort({error, ?ERR_ITEM_NOT_FOUND});
_ ->
lists:map(
fun(O) ->
mnesia:delete_object(O)
end, SupersededItems)
end;
_ ->
%% invalid "action" attribute - return an error
mnesia:abort({error, ?ERR_BAD_REQUEST})
end;
({xmlcdata, _CDATA}) ->
ok
end, Items)
end,
case mnesia:transaction(F) of
{aborted, {error, _} = Error} ->
Error;
{atomic, _} ->
ok;
_ ->
{error, ?ERR_INTERNAL_SERVER_ERROR}
end.
retrieve_disco_publish(User, Node) ->
case catch mnesia:dirty_read({disco_publish, {User, Node}}) of
{'EXIT', _Reason} ->
{error, ?ERR_INTERNAL_SERVER_ERROR};
[] ->
empty;
Items ->
{result,
lists:map(
fun(#disco_publish{jid = Jid,
name = Name,
node = PNode}) ->
{xmlelement, "item",
lists:append([[{"jid", Jid}],
case Name of
"" ->
[];
_ ->
[{"name", Name}]
end,
case PNode of
"" ->
[];
_ ->
[{"node", PNode}]
end]), []}
end, Items)}
end.
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