Chapril/xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/mod_vcard.erl
Evgeniy Khramtsov e4d21c1941 Introduce mod_avatar 
The purpose of the module is to cope with legacy and modern
XMPP clients posting avatars. It automatically converts vCard based
avatars (XEP-0153) to PEP based avatars (XEP-0084) and vice versa.
Also, the module supports convertation between avatar image formats on
the fly: this is controlled by `convert` option. For example, to
convert all avatars into PNG format, configure the module as:

mod_avatar:
  convert:
    default: png

In order to convert only `webp` format to `jpeg`, set the following:

mod_avatar:
  convert:
    webp: jpeg

Note: the module depends on mod_vcard, mod_vcard_xupdate and mod_pubsub.
Also, ejabberd should be built with --enable-graphics option.
2017-09-17 10:26:48 +03:00

567 lines
20 KiB
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%%%----------------------------------------------------------------------
%%% File : mod_vcard.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Vcard management
%%% Created : 2 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2017 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_vcard).
-author('alexey@process-one.net').
-protocol({xep, 54, '1.2'}).
-protocol({xep, 55, '1.3'}).
-behaviour(gen_server).
-behaviour(gen_mod).
-export([start/2, stop/1, get_sm_features/5,
process_local_iq/1, process_sm_iq/1, string2lower/1,
remove_user/2, export/1, import_info/0, import/5, import_start/2,
depends/2, process_search/1, process_vcard/1, get_vcard/2,
disco_items/5, disco_features/5, disco_identity/5,
vcard_iq_set/1, mod_opt_type/1, set_vcard/3, make_vcard_search/4]).
-export([init/1, handle_call/3, handle_cast/2,
handle_info/2, terminate/2, code_change/3]).
-include("ejabberd.hrl").
-include("logger.hrl").
-include("xmpp.hrl").
-include("mod_vcard.hrl").
-define(JUD_MATCHES, 30).
-define(VCARD_CACHE, vcard_cache).
-callback init(binary(), gen_mod:opts()) -> any().
-callback stop(binary()) -> any().
-callback import(binary(), binary(), [binary()]) -> ok.
-callback get_vcard(binary(), binary()) -> {ok, [xmlel()]} | error.
-callback set_vcard(binary(), binary(),
xmlel(), #vcard_search{}) -> {atomic, any()}.
-callback search_fields(binary()) -> [{binary(), binary()}].
-callback search_reported(binary()) -> [{binary(), binary()}].
-callback search(binary(), [{binary(), [binary()]}], boolean(),
infinity | pos_integer()) -> [{binary(), binary()}].
-callback remove_user(binary(), binary()) -> {atomic, any()}.
-callback is_search_supported(binary()) -> boolean().
-callback use_cache(binary()) -> boolean().
-callback cache_nodes(binary()) -> [node()].
-optional_callbacks([use_cache/1, cache_nodes/1]).
-record(state, {hosts :: [binary()], server_host :: binary()}).
%%====================================================================
%% gen_mod callbacks
%%====================================================================
start(Host, Opts) ->
gen_mod:start_child(?MODULE, Host, Opts).
stop(Host) ->
gen_mod:stop_child(?MODULE, Host).
%%====================================================================
%% gen_server callbacks
%%====================================================================
init([Host, Opts]) ->
process_flag(trap_exit, true),
Mod = gen_mod:db_mod(Host, Opts, ?MODULE),
Mod:init(Host, Opts),
init_cache(Mod, Host, Opts),
ejabberd_hooks:add(remove_user, Host, ?MODULE,
remove_user, 50),
IQDisc = gen_mod:get_opt(iqdisc, Opts, gen_iq_handler:iqdisc(Host)),
gen_iq_handler:add_iq_handler(ejabberd_local, Host,
?NS_VCARD, ?MODULE, process_local_iq, IQDisc),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
?NS_VCARD, ?MODULE, process_sm_iq, IQDisc),
ejabberd_hooks:add(disco_sm_features, Host, ?MODULE,
get_sm_features, 50),
ejabberd_hooks:add(vcard_iq_set, Host, ?MODULE, vcard_iq_set, 50),
MyHosts = gen_mod:get_opt_hosts(Host, Opts, <<"vjud.@HOST@">>),
Search = gen_mod:get_opt(search, Opts, false),
if Search ->
lists:foreach(
fun(MyHost) ->
ejabberd_hooks:add(
disco_local_items, MyHost, ?MODULE, disco_items, 100),
ejabberd_hooks:add(
disco_local_features, MyHost, ?MODULE, disco_features, 100),
ejabberd_hooks:add(
disco_local_identity, MyHost, ?MODULE, disco_identity, 100),
gen_iq_handler:add_iq_handler(
ejabberd_local, MyHost, ?NS_SEARCH, ?MODULE, process_search, IQDisc),
gen_iq_handler:add_iq_handler(
ejabberd_local, MyHost, ?NS_VCARD, ?MODULE, process_vcard, IQDisc),
gen_iq_handler:add_iq_handler(
ejabberd_local, MyHost, ?NS_DISCO_ITEMS, mod_disco,
process_local_iq_items, IQDisc),
gen_iq_handler:add_iq_handler(
ejabberd_local, MyHost, ?NS_DISCO_INFO, mod_disco,
process_local_iq_info, IQDisc),
case Mod:is_search_supported(Host) of
false ->
?WARNING_MSG("vcard search functionality is "
"not implemented for ~s backend",
[gen_mod:db_type(Host, Opts, ?MODULE)]);
true ->
ejabberd_router:register_route(MyHost, Host)
end
end, MyHosts);
true ->
ok
end,
{ok, #state{hosts = MyHosts, server_host = Host}}.
handle_call(_Call, _From, State) ->
{noreply, State}.
handle_cast(Cast, State) ->
?WARNING_MSG("unexpected cast: ~p", [Cast]),
{noreply, State}.
handle_info({route, Packet}, State) ->
case catch do_route(Packet) of
{'EXIT', Reason} -> ?ERROR_MSG("~p", [Reason]);
_ -> ok
end,
{noreply, State};
handle_info(Info, State) ->
?WARNING_MSG("unexpected info: ~p", [Info]),
{noreply, State}.
terminate(_Reason, #state{hosts = MyHosts, server_host = Host}) ->
ejabberd_hooks:delete(remove_user, Host, ?MODULE, remove_user, 50),
gen_iq_handler:remove_iq_handler(ejabberd_local, Host, ?NS_VCARD),
gen_iq_handler:remove_iq_handler(ejabberd_sm, Host, ?NS_VCARD),
ejabberd_hooks:delete(disco_sm_features, Host, ?MODULE, get_sm_features, 50),
ejabberd_hooks:delete(vcard_iq_set, Host, ?MODULE, vcard_iq_set, 50),
Mod = gen_mod:db_mod(Host, ?MODULE),
Mod:stop(Host),
lists:foreach(
fun(MyHost) ->
ejabberd_router:unregister_route(MyHost),
ejabberd_hooks:delete(disco_local_items, MyHost, ?MODULE, disco_items, 100),
ejabberd_hooks:delete(disco_local_features, MyHost, ?MODULE, disco_features, 100),
ejabberd_hooks:delete(disco_local_identity, MyHost, ?MODULE, disco_identity, 100),
gen_iq_handler:remove_iq_handler(ejabberd_local, MyHost, ?NS_SEARCH),
gen_iq_handler:remove_iq_handler(ejabberd_local, MyHost, ?NS_VCARD),
gen_iq_handler:remove_iq_handler(ejabberd_local, MyHost, ?NS_DISCO_ITEMS),
gen_iq_handler:remove_iq_handler(ejabberd_local, MyHost, ?NS_DISCO_INFO)
end, MyHosts).
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
do_route(#iq{} = IQ) ->
ejabberd_router:process_iq(IQ);
do_route(_) ->
ok.
-spec get_sm_features({error, stanza_error()} | empty | {result, [binary()]},
jid(), jid(), binary(), binary()) ->
{error, stanza_error()} | empty | {result, [binary()]}.
get_sm_features({error, _Error} = Acc, _From, _To,
_Node, _Lang) ->
Acc;
get_sm_features(Acc, _From, _To, Node, _Lang) ->
case Node of
<<"">> ->
case Acc of
{result, Features} ->
{result, [?NS_DISCO_INFO, ?NS_VCARD | Features]};
empty -> {result, [?NS_DISCO_INFO, ?NS_VCARD]}
end;
_ -> Acc
end.
-spec process_local_iq(iq()) -> iq().
process_local_iq(#iq{type = set, lang = Lang} = IQ) ->
Txt = <<"Value 'set' of 'type' attribute is not allowed">>,
xmpp:make_error(IQ, xmpp:err_not_allowed(Txt, Lang));
process_local_iq(#iq{type = get, lang = Lang} = IQ) ->
Desc = translate:translate(Lang, <<"Erlang Jabber Server">>),
xmpp:make_iq_result(
IQ, #vcard_temp{fn = <<"ejabberd">>,
url = ?EJABBERD_URI,
desc = <<Desc/binary, $\n, ?COPYRIGHT>>,
bday = <<"2002-11-16">>}).
-spec process_sm_iq(iq()) -> iq().
process_sm_iq(#iq{type = set, lang = Lang, from = From} = IQ) ->
#jid{lserver = LServer} = From,
case lists:member(LServer, ?MYHOSTS) of
true ->
case ejabberd_hooks:run_fold(vcard_iq_set, LServer, IQ, []) of
drop -> ignore;
#stanza_error{} = Err -> xmpp:make_error(IQ, Err);
_ -> xmpp:make_iq_result(IQ)
end;
false ->
Txt = <<"The query is only allowed from local users">>,
xmpp:make_error(IQ, xmpp:err_not_allowed(Txt, Lang))
end;
process_sm_iq(#iq{type = get, from = From, to = To, lang = Lang} = IQ) ->
#jid{luser = LUser, lserver = LServer} = To,
case get_vcard(LUser, LServer) of
error ->
Txt = <<"Database failure">>,
xmpp:make_error(IQ, xmpp:err_internal_server_error(Txt, Lang));
[] ->
xmpp:make_iq_result(IQ, #vcard_temp{});
Els ->
IQ#iq{type = result, to = From, from = To, sub_els = Els}
end.
-spec process_vcard(iq()) -> iq().
process_vcard(#iq{type = set, lang = Lang} = IQ) ->
Txt = <<"Value 'set' of 'type' attribute is not allowed">>,
xmpp:make_error(IQ, xmpp:err_not_allowed(Txt, Lang));
process_vcard(#iq{type = get, lang = Lang} = IQ) ->
Desc = translate:translate(Lang, <<"ejabberd vCard module">>),
xmpp:make_iq_result(
IQ, #vcard_temp{fn = <<"ejabberd/mod_vcard">>,
url = ?EJABBERD_URI,
desc = <<Desc/binary, $\n, ?COPYRIGHT>>}).
-spec process_search(iq()) -> iq().
process_search(#iq{type = get, to = To, lang = Lang} = IQ) ->
ServerHost = ejabberd_router:host_of_route(To#jid.lserver),
xmpp:make_iq_result(IQ, mk_search_form(To, ServerHost, Lang));
process_search(#iq{type = set, to = To, lang = Lang,
sub_els = [#search{xdata = #xdata{type = submit,
fields = Fs}}]} = IQ) ->
ServerHost = ejabberd_router:host_of_route(To#jid.lserver),
ResultXData = search_result(Lang, To, ServerHost, Fs),
xmpp:make_iq_result(IQ, #search{xdata = ResultXData});
process_search(#iq{type = set, lang = Lang} = IQ) ->
Txt = <<"Incorrect data form">>,
xmpp:make_error(IQ, xmpp:err_bad_request(Txt, Lang)).
-spec disco_items({error, stanza_error()} | {result, [disco_item()]} | empty,
jid(), jid(), binary(), binary()) ->
{error, stanza_error()} | {result, [disco_item()]}.
disco_items(empty, _From, _To, <<"">>, _Lang) ->
{result, []};
disco_items(empty, _From, _To, _Node, Lang) ->
{error, xmpp:err_item_not_found(<<"No services available">>, Lang)};
disco_items(Acc, _From, _To, _Node, _Lang) ->
Acc.
-spec disco_features({error, stanza_error()} | {result, [binary()]} | empty,
jid(), jid(), binary(), binary()) ->
{error, stanza_error()} | {result, [binary()]}.
disco_features({error, _Error} = Acc, _From, _To, _Node, _Lang) ->
Acc;
disco_features(Acc, _From, _To, <<"">>, _Lang) ->
Features = case Acc of
{result, Fs} -> Fs;
empty -> []
end,
{result, [?NS_DISCO_INFO, ?NS_DISCO_ITEMS,
?NS_VCARD, ?NS_SEARCH | Features]};
disco_features(empty, _From, _To, _Node, Lang) ->
Txt = <<"No features available">>,
{error, xmpp:err_item_not_found(Txt, Lang)};
disco_features(Acc, _From, _To, _Node, _Lang) ->
Acc.
-spec disco_identity([identity()], jid(), jid(),
binary(), binary()) -> [identity()].
disco_identity(Acc, _From, _To, <<"">>, Lang) ->
[#identity{category = <<"directory">>,
type = <<"user">>,
name = translate:translate(Lang, <<"vCard User Search">>)}|Acc];
disco_identity(Acc, _From, _To, _Node, _Lang) ->
Acc.
-spec get_vcard(binary(), binary()) -> [xmlel()] | error.
get_vcard(LUser, LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Result = case use_cache(Mod, LServer) of
true ->
ets_cache:lookup(
?VCARD_CACHE, {LUser, LServer},
fun() -> Mod:get_vcard(LUser, LServer) end);
false ->
Mod:get_vcard(LUser, LServer)
end,
case Result of
{ok, Els} -> Els;
error -> error
end.
-spec make_vcard_search(binary(), binary(), binary(), xmlel()) -> #vcard_search{}.
make_vcard_search(User, LUser, LServer, VCARD) ->
FN = fxml:get_path_s(VCARD, [{elem, <<"FN">>}, cdata]),
Family = fxml:get_path_s(VCARD,
[{elem, <<"N">>}, {elem, <<"FAMILY">>}, cdata]),
Given = fxml:get_path_s(VCARD,
[{elem, <<"N">>}, {elem, <<"GIVEN">>}, cdata]),
Middle = fxml:get_path_s(VCARD,
[{elem, <<"N">>}, {elem, <<"MIDDLE">>}, cdata]),
Nickname = fxml:get_path_s(VCARD,
[{elem, <<"NICKNAME">>}, cdata]),
BDay = fxml:get_path_s(VCARD,
[{elem, <<"BDAY">>}, cdata]),
CTRY = fxml:get_path_s(VCARD,
[{elem, <<"ADR">>}, {elem, <<"CTRY">>}, cdata]),
Locality = fxml:get_path_s(VCARD,
[{elem, <<"ADR">>}, {elem, <<"LOCALITY">>},
cdata]),
EMail1 = fxml:get_path_s(VCARD,
[{elem, <<"EMAIL">>}, {elem, <<"USERID">>}, cdata]),
EMail2 = fxml:get_path_s(VCARD,
[{elem, <<"EMAIL">>}, cdata]),
OrgName = fxml:get_path_s(VCARD,
[{elem, <<"ORG">>}, {elem, <<"ORGNAME">>}, cdata]),
OrgUnit = fxml:get_path_s(VCARD,
[{elem, <<"ORG">>}, {elem, <<"ORGUNIT">>}, cdata]),
EMail = case EMail1 of
<<"">> -> EMail2;
_ -> EMail1
end,
LFN = string2lower(FN),
LFamily = string2lower(Family),
LGiven = string2lower(Given),
LMiddle = string2lower(Middle),
LNickname = string2lower(Nickname),
LBDay = string2lower(BDay),
LCTRY = string2lower(CTRY),
LLocality = string2lower(Locality),
LEMail = string2lower(EMail),
LOrgName = string2lower(OrgName),
LOrgUnit = string2lower(OrgUnit),
US = {LUser, LServer},
#vcard_search{us = US,
user = {User, LServer},
luser = LUser, fn = FN,
lfn = LFN,
family = Family,
lfamily = LFamily,
given = Given,
lgiven = LGiven,
middle = Middle,
lmiddle = LMiddle,
nickname = Nickname,
lnickname = LNickname,
bday = BDay,
lbday = LBDay,
ctry = CTRY,
lctry = LCTRY,
locality = Locality,
llocality = LLocality,
email = EMail,
lemail = LEMail,
orgname = OrgName,
lorgname = LOrgName,
orgunit = OrgUnit,
lorgunit = LOrgUnit}.
-spec vcard_iq_set(iq()) -> iq() | {stop, stanza_error()}.
vcard_iq_set(#iq{from = From, lang = Lang, sub_els = [VCard]} = IQ) ->
#jid{user = User, lserver = LServer} = From,
case set_vcard(User, LServer, VCard) of
{error, badarg} ->
%% Should not be here?
Txt = <<"Nodeprep has failed">>,
{stop, xmpp:err_internal_server_error(Txt, Lang)};
ok ->
IQ
end;
vcard_iq_set(Acc) ->
Acc.
-spec set_vcard(binary(), binary(), xmlel() | vcard_temp()) -> {error, badarg} | ok.
set_vcard(User, LServer, VCARD) ->
case jid:nodeprep(User) of
error ->
{error, badarg};
LUser ->
VCardEl = xmpp:encode(VCARD),
VCardSearch = make_vcard_search(User, LUser, LServer, VCardEl),
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:set_vcard(LUser, LServer, VCardEl, VCardSearch),
ets_cache:delete(?VCARD_CACHE, {LUser, LServer},
cache_nodes(Mod, LServer)),
ok
end.
-spec string2lower(binary()) -> binary().
string2lower(String) ->
case stringprep:tolower(String) of
Lower when is_binary(Lower) -> Lower;
error -> str:to_lower(String)
end.
-spec mk_tfield(binary(), binary(), binary()) -> xdata_field().
mk_tfield(Label, Var, Lang) ->
#xdata_field{type = 'text-single',
label = translate:translate(Lang, Label),
var = Var}.
-spec mk_field(binary(), binary()) -> xdata_field().
mk_field(Var, Val) ->
#xdata_field{var = Var, values = [Val]}.
-spec mk_search_form(jid(), binary(), binary()) -> search().
mk_search_form(JID, ServerHost, Lang) ->
Title = <<(translate:translate(Lang, <<"Search users in ">>))/binary,
(jid:encode(JID))/binary>>,
Mod = gen_mod:db_mod(ServerHost, ?MODULE),
SearchFields = Mod:search_fields(ServerHost),
Fs = [mk_tfield(Label, Var, Lang) || {Label, Var} <- SearchFields],
X = #xdata{type = form,
title = Title,
instructions =
[translate:translate(
Lang,
<<"Fill in the form to search for any matching "
"Jabber User (Add * to the end of field "
"to match substring)">>)],
fields = Fs},
#search{instructions =
translate:translate(
Lang, <<"You need an x:data capable client to search">>),
xdata = X}.
-spec search_result(binary(), jid(), binary(), [xdata_field()]) -> xdata().
search_result(Lang, JID, ServerHost, XFields) ->
Mod = gen_mod:db_mod(ServerHost, ?MODULE),
Reported = [mk_tfield(Label, Var, Lang) ||
{Label, Var} <- Mod:search_reported(ServerHost)],
#xdata{type = result,
title = <<(translate:translate(Lang,
<<"Search Results for ">>))/binary,
(jid:encode(JID))/binary>>,
reported = Reported,
items = lists:map(fun (Item) -> item_to_field(Item) end,
search(ServerHost, XFields))}.
-spec item_to_field([{binary(), binary()}]) -> [xdata_field()].
item_to_field(Items) ->
[mk_field(Var, Value) || {Var, Value} <- Items].
-spec search(binary(), [xdata_field()]) -> [binary()].
search(LServer, XFields) ->
Data = [{Var, Vals} || #xdata_field{var = Var, values = Vals} <- XFields],
Mod = gen_mod:db_mod(LServer, ?MODULE),
AllowReturnAll = gen_mod:get_module_opt(LServer, ?MODULE, allow_return_all,
false),
MaxMatch = gen_mod:get_module_opt(LServer, ?MODULE, matches, ?JUD_MATCHES),
Mod:search(LServer, Data, AllowReturnAll, MaxMatch).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-spec remove_user(binary(), binary()) -> ok.
remove_user(User, Server) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:remove_user(LUser, LServer),
ets_cache:delete(?VCARD_CACHE, {LUser, LServer}, cache_nodes(Mod, LServer)).
-spec init_cache(module(), binary(), gen_mod:opts()) -> ok.
init_cache(Mod, Host, Opts) ->
case use_cache(Mod, Host) of
true ->
CacheOpts = cache_opts(Host, Opts),
ets_cache:new(?VCARD_CACHE, CacheOpts);
false ->
ets_cache:delete(?VCARD_CACHE)
end.
-spec cache_opts(binary(), gen_mod:opts()) -> [proplists:property()].
cache_opts(Host, Opts) ->
MaxSize = gen_mod:get_opt(
cache_size, Opts,
ejabberd_config:cache_size(Host)),
CacheMissed = gen_mod:get_opt(
cache_missed, Opts,
ejabberd_config:cache_missed(Host)),
LifeTime = case gen_mod:get_opt(
cache_life_time, Opts,
ejabberd_config:cache_life_time(Host)) of
infinity -> infinity;
I -> timer:seconds(I)
end,
[{max_size, MaxSize}, {cache_missed, CacheMissed}, {life_time, LifeTime}].
-spec use_cache(module(), binary()) -> boolean().
use_cache(Mod, Host) ->
case erlang:function_exported(Mod, use_cache, 1) of
true -> Mod:use_cache(Host);
false ->
gen_mod:get_module_opt(
Host, ?MODULE, use_cache,
ejabberd_config:use_cache(Host))
end.
-spec cache_nodes(module(), binary()) -> [node()].
cache_nodes(Mod, Host) ->
case erlang:function_exported(Mod, cache_nodes, 1) of
true -> Mod:cache_nodes(Host);
false -> ejabberd_cluster:get_nodes()
end.
import_info() ->
[{<<"vcard">>, 3}, {<<"vcard_search">>, 24}].
import_start(LServer, DBType) ->
Mod = gen_mod:db_mod(DBType, ?MODULE),
Mod:init(LServer, []).
import(LServer, {sql, _}, DBType, Tab, L) ->
Mod = gen_mod:db_mod(DBType, ?MODULE),
Mod:import(LServer, Tab, L).
export(LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:export(LServer).
depends(_Host, _Opts) ->
[].
mod_opt_type(allow_return_all) ->
fun (B) when is_boolean(B) -> B end;
mod_opt_type(db_type) -> fun(T) -> ejabberd_config:v_db(?MODULE, T) end;
mod_opt_type(host) -> fun iolist_to_binary/1;
mod_opt_type(hosts) ->
fun (L) -> lists:map(fun iolist_to_binary/1, L) end;
mod_opt_type(iqdisc) -> fun gen_iq_handler:check_type/1;
mod_opt_type(matches) ->
fun (infinity) -> infinity;
(I) when is_integer(I), I > 0 -> I
end;
mod_opt_type(search) ->
fun (B) when is_boolean(B) -> B end;
mod_opt_type(search_all_hosts) ->
fun (B) when is_boolean(B) -> B end;
mod_opt_type(O) when O == cache_life_time; O == cache_size ->
fun (I) when is_integer(I), I > 0 -> I;
(infinity) -> infinity
end;
mod_opt_type(O) when O == use_cache; O == cache_missed ->
fun (B) when is_boolean(B) -> B end;
mod_opt_type(_) ->
[allow_return_all, db_type, host, hosts, iqdisc, matches,
search, search_all_hosts, cache_life_time, cache_size,
use_cache, cache_missed].
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