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%%%----------------------------------------------------------------------
%%% File : mod_private.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Support for private storage.
%%% Created : 16 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2018 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_private).
-author('alexey@process-one.net').
-protocol({xep, 49, '1.2'}).
-behaviour(gen_mod).
-export([start/2, stop/1, reload/3, process_sm_iq/1, import_info/0,
remove_user/2, get_data/2, get_data/3, export/1,
import/5, import_start/2, mod_opt_type/1, set_data/3,
mod_options/1, depends/2]).
-include("logger.hrl").
-include("xmpp.hrl").
-include("mod_private.hrl").
-define(PRIVATE_CACHE, private_cache).
-callback init(binary(), gen_mod:opts()) -> any().
-callback import(binary(), binary(), [binary()]) -> ok.
-callback set_data(binary(), binary(), [{binary(), xmlel()}]) -> ok | {error, any()}.
-callback get_data(binary(), binary(), binary()) -> {ok, xmlel()} | error | {error, any()}.
-callback get_all_data(binary(), binary()) -> {ok, [xmlel()]} | error | {error, any()}.
-callback del_data(binary(), binary()) -> ok | {error, any()}.
-callback use_cache(binary()) -> boolean().
-callback cache_nodes(binary()) -> [node()].
-optional_callbacks([use_cache/1, cache_nodes/1]).
start(Host, Opts) ->
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),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
?NS_PRIVATE, ?MODULE, process_sm_iq).
stop(Host) ->
ejabberd_hooks:delete(remove_user, Host, ?MODULE,
remove_user, 50),
gen_iq_handler:remove_iq_handler(ejabberd_sm, Host,
?NS_PRIVATE).
reload(Host, NewOpts, OldOpts) ->
NewMod = gen_mod:db_mod(Host, NewOpts, ?MODULE),
OldMod = gen_mod:db_mod(Host, OldOpts, ?MODULE),
if NewMod /= OldMod ->
NewMod:init(Host, NewOpts);
true ->
ok
end,
init_cache(NewMod, Host, NewOpts).
-spec process_sm_iq(iq()) -> iq().
process_sm_iq(#iq{type = Type, lang = Lang,
from = #jid{luser = LUser, lserver = LServer},
to = #jid{luser = LUser, lserver = LServer},
sub_els = [#private{sub_els = Els0}]} = IQ) ->
case filter_xmlels(Els0) of
[] ->
Txt = <<"No private data found in this query">>,
xmpp:make_error(IQ, xmpp:err_bad_request(Txt, Lang));
Data when Type == set ->
case set_data(LUser, LServer, Data) of
ok ->
xmpp:make_iq_result(IQ);
{error, _} ->
Txt = <<"Database failure">>,
Err = xmpp:err_internal_server_error(Txt, Lang),
xmpp:make_error(IQ, Err)
end;
Data when Type == get ->
case get_data(LUser, LServer, Data) of
{error, _} ->
Txt = <<"Database failure">>,
Err = xmpp:err_internal_server_error(Txt, Lang),
xmpp:make_error(IQ, Err);
Els ->
xmpp:make_iq_result(IQ, #private{sub_els = Els})
end
end;
process_sm_iq(#iq{lang = Lang} = IQ) ->
Txt = <<"Query to another users is forbidden">>,
xmpp:make_error(IQ, xmpp:err_forbidden(Txt, Lang)).
-spec filter_xmlels([xmlel()]) -> [{binary(), xmlel()}].
filter_xmlels(Els) ->
lists:flatmap(
fun(#xmlel{} = El) ->
case fxml:get_tag_attr_s(<<"xmlns">>, El) of
<<"">> -> [];
NS -> [{NS, El}]
end
end, Els).
-spec set_data(binary(), binary(), [{binary(), xmlel()}]) -> ok | {error, _}.
set_data(LUser, LServer, Data) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
case Mod:set_data(LUser, LServer, Data) of
ok ->
delete_cache(Mod, LUser, LServer, Data);
{error, _} = Err ->
Err
end.
-spec get_data(binary(), binary(), [{binary(), xmlel()}]) -> [xmlel()] | {error, _}.
get_data(LUser, LServer, Data) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
lists:foldr(
fun(_, {error, _} = Err) ->
Err;
({NS, El}, Els) ->
Res = case use_cache(Mod, LServer) of
true ->
ets_cache:lookup(
?PRIVATE_CACHE, {LUser, LServer, NS},
fun() -> Mod:get_data(LUser, LServer, NS) end);
false ->
Mod:get_data(LUser, LServer, NS)
end,
case Res of
{ok, StorageEl} ->
[StorageEl|Els];
error ->
[El|Els];
{error, _} = Err ->
Err
end
end, [], Data).
-spec get_data(binary(), binary()) -> [xmlel()] | {error, _}.
get_data(LUser, LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
case Mod:get_all_data(LUser, LServer) of
{ok, Els} -> Els;
error -> [];
{error, _} = Err -> Err
end.
-spec remove_user(binary(), binary()) -> ok.
remove_user(User, Server) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
Mod = gen_mod:db_mod(Server, ?MODULE),
Data = case use_cache(Mod, LServer) of
true ->
case Mod:get_all_data(LUser, LServer) of
{ok, Els} -> filter_xmlels(Els);
_ -> []
end;
false ->
[]
end,
Mod:del_data(LUser, LServer),
delete_cache(Mod, LUser, LServer, Data).
-spec delete_cache(module(), binary(), binary(), [{binary(), xmlel()}]) -> ok.
delete_cache(Mod, LUser, LServer, Data) ->
case use_cache(Mod, LServer) of
true ->
Nodes = cache_nodes(Mod, LServer),
lists:foreach(
fun({NS, _}) ->
ets_cache:delete(?PRIVATE_CACHE,
{LUser, LServer, NS},
Nodes)
end, Data);
false ->
ok
end.
-spec init_cache(module(), binary(), gen_mod:opts()) -> ok.
init_cache(Mod, Host, Opts) ->
case use_cache(Mod, Host) of
true ->
CacheOpts = cache_opts(Opts),
ets_cache:new(?PRIVATE_CACHE, CacheOpts);
false ->
ets_cache:delete(?PRIVATE_CACHE)
end.
-spec cache_opts(gen_mod:opts()) -> [proplists:property()].
cache_opts(Opts) ->
MaxSize = gen_mod:get_opt(cache_size, Opts),
CacheMissed = gen_mod:get_opt(cache_missed, Opts),
LifeTime = case gen_mod:get_opt(cache_life_time, Opts) 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)
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() ->
[{<<"private_storage">>, 4}].
import_start(LServer, DBType) ->
Mod = gen_mod:db_mod(DBType, ?MODULE),
Mod:init(LServer, []).
export(LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:export(LServer).
import(LServer, {sql, _}, DBType, Tab, L) ->
Mod = gen_mod:db_mod(DBType, ?MODULE),
Mod:import(LServer, Tab, L).
depends(_Host, _Opts) ->
[].
mod_opt_type(db_type) -> fun(T) -> ejabberd_config:v_db(?MODULE, T) 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_options(Host) ->
[{db_type, ejabberd_config:default_db(Host, ?MODULE)},
{use_cache, ejabberd_config:use_cache(Host)},
{cache_size, ejabberd_config:cache_size(Host)},
{cache_missed, ejabberd_config:cache_missed(Host)},
{cache_life_time, ejabberd_config:cache_life_time(Host)}].
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