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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) 2002-2020 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').
-protocol({xep, 30, '2.4'}).
-protocol({xep, 157, '1.0'}).
-behaviour(gen_mod).
-export([start/2, stop/1, reload/3, process_local_iq_items/1,
process_local_iq_info/1, get_local_identity/5,
get_local_features/5, get_local_services/5,
process_sm_iq_items/1, process_sm_iq_info/1,
get_sm_identity/5, get_sm_features/5, get_sm_items/5,
get_info/5, mod_opt_type/1, mod_options/1, depends/2,
mod_doc/0]).
-include("logger.hrl").
-include("translate.hrl").
-include_lib("xmpp/include/xmpp.hrl").
-include_lib("stdlib/include/ms_transform.hrl").
-include("mod_roster.hrl").
-type features_acc() :: {error, stanza_error()} | {result, [binary()]} | empty.
-type items_acc() :: {error, stanza_error()} | {result, [disco_item()]} | empty.
-export_type([features_acc/0, items_acc/0]).
start(Host, Opts) ->
gen_iq_handler:add_iq_handler(ejabberd_local, Host,
?NS_DISCO_ITEMS, ?MODULE,
process_local_iq_items),
gen_iq_handler:add_iq_handler(ejabberd_local, Host,
?NS_DISCO_INFO, ?MODULE,
process_local_iq_info),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
?NS_DISCO_ITEMS, ?MODULE, process_sm_iq_items),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
?NS_DISCO_INFO, ?MODULE, process_sm_iq_info),
catch ets:new(disco_extra_domains,
[named_table, ordered_set, public,
{heir, erlang:group_leader(), none}]),
ExtraDomains = mod_disco_opt:extra_domains(Opts),
lists:foreach(fun (Domain) ->
register_extra_domain(Host, Domain)
end,
ExtraDomains),
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_extra_domains,
{{'_', Host}}),
ok.
reload(Host, NewOpts, OldOpts) ->
NewDomains = mod_disco_opt:extra_domains(NewOpts),
OldDomains = mod_disco_opt:extra_domains(OldOpts),
lists:foreach(
fun(Domain) ->
register_extra_domain(Host, Domain)
end, NewDomains -- OldDomains),
lists:foreach(
fun(Domain) ->
unregister_extra_domain(Host, Domain)
end, OldDomains -- NewDomains).
-spec register_extra_domain(binary(), binary()) -> true.
register_extra_domain(Host, Domain) ->
ets:insert(disco_extra_domains, {{Domain, Host}}).
-spec unregister_extra_domain(binary(), binary()) -> true.
unregister_extra_domain(Host, Domain) ->
ets:delete_object(disco_extra_domains, {{Domain, Host}}).
-spec process_local_iq_items(iq()) -> iq().
process_local_iq_items(#iq{type = set, lang = Lang} = IQ) ->
Txt = ?T("Value 'set' of 'type' attribute is not allowed"),
xmpp:make_error(IQ, xmpp:err_not_allowed(Txt, Lang));
process_local_iq_items(#iq{type = get, lang = Lang,
from = From, to = To,
sub_els = [#disco_items{node = Node}]} = IQ) ->
Host = To#jid.lserver,
case ejabberd_hooks:run_fold(disco_local_items, Host,
empty, [From, To, Node, Lang]) of
{result, Items} ->
xmpp:make_iq_result(IQ, #disco_items{node = Node, items = Items});
{error, Error} ->
xmpp:make_error(IQ, Error)
end.
-spec process_local_iq_info(iq()) -> iq().
process_local_iq_info(#iq{type = set, lang = Lang} = IQ) ->
Txt = ?T("Value 'set' of 'type' attribute is not allowed"),
xmpp:make_error(IQ, xmpp:err_not_allowed(Txt, Lang));
process_local_iq_info(#iq{type = get, lang = Lang,
from = From, to = To,
sub_els = [#disco_info{node = Node}]} = IQ) ->
Host = To#jid.lserver,
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} ->
xmpp:make_iq_result(IQ, #disco_info{node = Node,
identities = Identity,
xdata = Info,
features = Features});
{error, Error} ->
xmpp:make_error(IQ, Error)
end.
-spec get_local_identity([identity()], jid(), jid(),
binary(), binary()) -> [identity()].
get_local_identity(Acc, _From, To, <<"">>, _Lang) ->
Host = To#jid.lserver,
Name = mod_disco_opt:name(Host),
Acc ++ [#identity{category = <<"server">>,
type = <<"im">>,
name = Name}];
get_local_identity(Acc, _From, _To, _Node, _Lang) ->
Acc.
-spec get_local_features(features_acc(), jid(), jid(), binary(), binary()) ->
{error, stanza_error()} | {result, [binary()]}.
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,
{result, lists:usort(
lists:flatten(
[?NS_FEATURE_IQ, ?NS_FEATURE_PRESENCE,
?NS_DISCO_INFO, ?NS_DISCO_ITEMS, Feats,
ejabberd_local:get_features(To#jid.lserver)]))};
get_local_features(Acc, _From, _To, _Node, Lang) ->
case Acc of
{result, _Features} -> Acc;
empty ->
Txt = ?T("No features available"),
{error, xmpp:err_item_not_found(Txt, Lang)}
end.
-spec get_local_services(items_acc(), jid(), jid(), binary(), binary()) ->
{error, stanza_error()} | {result, [disco_item()]}.
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) -> #disco_item{jid = jid:make(Domain)} end,
get_vh_services(Host) ++
ets:select(disco_extra_domains,
ets:fun2ms(
fun({{D, H}}) when H == Host -> D end))))
++ Items};
get_local_services({result, _} = Acc, _From, _To, _Node,
_Lang) ->
Acc;
get_local_services(empty, _From, _To, _Node, Lang) ->
{error, xmpp:err_item_not_found(?T("No services available"), Lang)}.
-spec get_vh_services(binary()) -> [binary()].
get_vh_services(Host) ->
Hosts = lists:sort(fun (H1, H2) ->
byte_size(H1) >= byte_size(H2)
end,
ejabberd_option:hosts()),
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:get_all_routes()).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-spec process_sm_iq_items(iq()) -> iq().
process_sm_iq_items(#iq{type = set, lang = Lang} = IQ) ->
Txt = ?T("Value 'set' of 'type' attribute is not allowed"),
xmpp:make_error(IQ, xmpp:err_not_allowed(Txt, Lang));
process_sm_iq_items(#iq{type = get, lang = Lang,
from = From, to = To,
sub_els = [#disco_items{node = Node}]} = IQ) ->
case mod_roster:is_subscribed(From, To) of
true ->
Host = To#jid.lserver,
case ejabberd_hooks:run_fold(disco_sm_items, Host,
empty, [From, To, Node, Lang]) of
{result, Items} ->
xmpp:make_iq_result(
IQ, #disco_items{node = Node, items = Items});
{error, Error} ->
xmpp:make_error(IQ, Error)
end;
false ->
Txt = ?T("Not subscribed"),
xmpp:make_error(IQ, xmpp:err_subscription_required(Txt, Lang))
end.
-spec get_sm_items(items_acc(), jid(), jid(), binary(), binary()) ->
{error, stanza_error()} | {result, [disco_item()]}.
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 mod_roster:is_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, xmpp:err_item_not_found()};
_ ->
Txt = ?T("Query to another users is forbidden"),
{error, xmpp:err_not_allowed(Txt, Lang)}
end.
-spec process_sm_iq_info(iq()) -> iq().
process_sm_iq_info(#iq{type = set, lang = Lang} = IQ) ->
Txt = ?T("Value 'set' of 'type' attribute is not allowed"),
xmpp:make_error(IQ, xmpp:err_not_allowed(Txt, Lang));
process_sm_iq_info(#iq{type = get, lang = Lang,
from = From, to = To,
sub_els = [#disco_info{node = Node}]} = IQ) ->
case mod_roster:is_subscribed(From, To) of
true ->
Host = To#jid.lserver,
Identity = ejabberd_hooks:run_fold(disco_sm_identity,
Host, [],
[From, To, Node, Lang]),
Info = ejabberd_hooks:run_fold(disco_info, Host, [],
[From, To, Node, Lang]),
case ejabberd_hooks:run_fold(disco_sm_features, Host,
empty, [From, To, Node, Lang]) of
{result, Features} ->
xmpp:make_iq_result(IQ, #disco_info{node = Node,
identities = Identity,
xdata = Info,
features = Features});
{error, Error} ->
xmpp:make_error(IQ, Error)
end;
false ->
Txt = ?T("Not subscribed"),
xmpp:make_error(IQ, xmpp:err_subscription_required(Txt, Lang))
end.
-spec get_sm_identity([identity()], jid(), jid(),
binary(), binary()) -> [identity()].
get_sm_identity(Acc, _From,
#jid{luser = LUser, lserver = LServer}, _Node, _Lang) ->
Acc ++
case ejabberd_auth:user_exists(LUser, LServer) of
true ->
[#identity{category = <<"account">>, type = <<"registered">>}];
_ -> []
end.
-spec get_sm_features(features_acc(), jid(), jid(), binary(), binary()) ->
{error, stanza_error()} | {result, [binary()]}.
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} ->
case Node of
<<"">> -> {result, [?NS_DISCO_INFO, ?NS_DISCO_ITEMS]};
_ -> {error, xmpp:err_item_not_found()}
end;
_ ->
Txt = ?T("Query to another users is forbidden"),
{error, xmpp:err_not_allowed(Txt, Lang)}
end;
get_sm_features({result, Features}, _From, _To, <<"">>, _Lang) ->
{result, [?NS_DISCO_INFO, ?NS_DISCO_ITEMS|Features]};
get_sm_features(Acc, _From, _To, _Node, _Lang) -> Acc.
-spec get_user_resources(binary(), binary()) -> [disco_item()].
get_user_resources(User, Server) ->
Rs = ejabberd_sm:get_user_resources(User, Server),
[#disco_item{jid = jid:make(User, Server, Resource), name = User}
|| Resource <- lists:sort(Rs)].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Support for: XEP-0157 Contact Addresses for XMPP Services
-spec get_info([xdata()], binary(), module(), binary(), binary()) -> [xdata()];
([xdata()], jid(), jid(), binary(), binary()) -> [xdata()].
get_info(_A, Host, Mod, Node, _Lang) when is_atom(Mod), Node == <<"">> ->
Module = case Mod of
undefined -> ?MODULE;
_ -> Mod
end,
[#xdata{type = result,
fields = [#xdata_field{type = hidden,
var = <<"FORM_TYPE">>,
values = [?NS_SERVERINFO]}
| get_fields(Host, Module)]}];
get_info(Acc, _, _, _Node, _) -> Acc.
-spec get_fields(binary(), module()) -> [xdata_field()].
get_fields(Host, Module) ->
Fields = mod_disco_opt:server_info(Host),
Fields1 = lists:filter(fun ({Modules, _, _}) ->
case Modules of
all -> true;
Modules ->
lists:member(Module, Modules)
end
end,
Fields),
[#xdata_field{var = Var,
type = 'list-multi',
values = Values} || {_, Var, Values} <- Fields1].
-spec depends(binary(), gen_mod:opts()) -> [].
depends(_Host, _Opts) ->
[].
mod_opt_type(extra_domains) ->
econf:list(econf:binary());
mod_opt_type(name) ->
econf:binary();
mod_opt_type(server_info) ->
econf:list(
econf:and_then(
econf:options(
#{name => econf:binary(),
urls => econf:list(econf:binary()),
modules =>
econf:either(
all,
econf:list(econf:beam()))}),
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)).
-spec mod_options(binary()) -> [{server_info,
[{all | [module()], binary(), [binary()]}]} |
{atom(), any()}].
mod_options(_Host) ->
[{extra_domains, []},
{server_info, []},
{name, ?T("ejabberd")}].
mod_doc() ->
#{desc =>
?T("This module adds support for "
"https://xmpp.org/extensions/xep-0030.html"
"[XEP-0030: Service Discovery]. With this module enabled, "
"services on your server can be discovered by XMPP clients."),
opts =>
[{extra_domains,
#{value => "[Domain, ...]",
desc =>
?T("With this option, you can specify a list of extra "
"domains that are added to the Service Discovery item list. "
"The default value is an empty list.")}},
{name,
#{value => ?T("Name"),
desc =>
?T("A name of the server in the Service Discovery. "
"This will only be displayed by special XMPP clients. "
"The default value is 'ejabberd'.")}},
{server_info,
#{value => "[Info, ...]",
example =>
["server_info:",
" -",
" modules: all",
" name: abuse-addresses",
" urls: [mailto:abuse@shakespeare.lit]",
" -",
" modules: [mod_muc]",
" name: \"Web chatroom logs\"",
" urls: [http://www.example.org/muc-logs]",
" -",
" modules: [mod_disco]",
" name: feedback-addresses",
" urls:",
" - http://shakespeare.lit/feedback.php",
" - mailto:feedback@shakespeare.lit",
" - xmpp:feedback@shakespeare.lit",
" -",
" modules:",
" - mod_disco",
" - mod_vcard",
" name: admin-addresses",
" urls:",
" - mailto:xmpp@shakespeare.lit",
" - xmpp:admins@shakespeare.lit"],
desc =>
?T("Specify additional information about the server, "
"as described in https://xmpp.org/extensions/xep-0157.html"
"[XEP-0157: Contact Addresses for XMPP Services]. Every 'Info' "
"element in the list is constructed from the following options:")},
[{modules,
#{value => "all | [Module, ...]",
desc =>
?T("The value can be the keyword 'all', in which case the "
"information is reported in all the services, "
"or a list of ejabberd modules, in which case the "
"information is only specified for the services provided "
"by those modules.")}},
{name,
#{value => ?T("Name"),
desc => ?T("The field 'var' name that will be defined. "
"See XEP-0157 for some standardized names.")}},
{urls,
#{value => "[URI, ...]",
desc => ?T("A list of contact URIs, such as "
"HTTP URLs, XMPP URIs and so on.")}}]}]}.
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