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

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%%%----------------------------------------------------------------------
%%% File : mod_offline.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Store and manage offline messages.
%%% Created : 5 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2022 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_offline).
-author('alexey@process-one.net').
-protocol({xep, 13, '1.2'}).
-protocol({xep, 22, '1.4'}).
-protocol({xep, 23, '1.3'}).
-protocol({xep, 160, '1.0'}).
-protocol({xep, 334, '0.2'}).
-behaviour(gen_mod).
-export([start/2,
stop/1,
reload/3,
store_packet/1,
store_offline_msg/1,
c2s_self_presence/1,
get_sm_features/5,
get_sm_identity/5,
get_sm_items/5,
get_info/5,
handle_offline_query/1,
remove_expired_messages/1,
remove_old_messages/2,
remove_user/2,
import_info/0,
import_start/2,
import/5,
export/1,
get_queue_length/2,
count_offline_messages/2,
get_offline_els/2,
find_x_expire/2,
c2s_handle_info/2,
c2s_copy_session/2,
webadmin_page/3,
webadmin_user/4,
webadmin_user_parse_query/5]).
-export([mod_opt_type/1, mod_options/1, mod_doc/0, depends/2]).
-deprecated({get_queue_length,2}).
-include("logger.hrl").
-include_lib("xmpp/include/xmpp.hrl").
-include("ejabberd_http.hrl").
-include("ejabberd_web_admin.hrl").
-include("mod_offline.hrl").
-include("translate.hrl").
-define(OFFLINE_TABLE_LOCK_THRESHOLD, 1000).
%% default value for the maximum number of user messages
-define(MAX_USER_MESSAGES, infinity).
-define(SPOOL_COUNTER_CACHE, offline_msg_counter_cache).
-type c2s_state() :: ejabberd_c2s:state().
-callback init(binary(), gen_mod:opts()) -> any().
-callback import(#offline_msg{}) -> ok.
-callback store_message(#offline_msg{}) -> ok | {error, any()}.
-callback pop_messages(binary(), binary()) ->
{ok, [#offline_msg{}]} | {error, any()}.
-callback remove_expired_messages(binary()) -> {atomic, any()}.
-callback remove_old_messages(non_neg_integer(), binary()) -> {atomic, any()}.
-callback remove_user(binary(), binary()) -> any().
-callback read_message_headers(binary(), binary()) ->
[{non_neg_integer(), jid(), jid(), undefined | erlang:timestamp(), xmlel()}] | error.
-callback read_message(binary(), binary(), non_neg_integer()) ->
{ok, #offline_msg{}} | error.
-callback remove_message(binary(), binary(), non_neg_integer()) -> ok | {error, any()}.
-callback read_all_messages(binary(), binary()) -> [#offline_msg{}].
-callback remove_all_messages(binary(), binary()) -> {atomic, any()}.
-callback count_messages(binary(), binary()) -> {ets_cache:tag(), non_neg_integer()}.
-callback use_cache(binary()) -> boolean().
-callback cache_nodes(binary()) -> [node()].
-optional_callbacks([remove_expired_messages/1, remove_old_messages/2,
use_cache/1, cache_nodes/1]).
depends(_Host, _Opts) ->
[].
start(Host, Opts) ->
Mod = gen_mod:db_mod(Opts, ?MODULE),
Mod:init(Host, Opts),
init_cache(Mod, Host, Opts),
ejabberd_hooks:add(offline_message_hook, Host, ?MODULE,
store_packet, 50),
ejabberd_hooks:add(c2s_self_presence, Host, ?MODULE, c2s_self_presence, 50),
ejabberd_hooks:add(remove_user, Host,
?MODULE, remove_user, 50),
ejabberd_hooks:add(disco_sm_features, Host,
?MODULE, get_sm_features, 50),
ejabberd_hooks:add(disco_local_features, Host,
?MODULE, get_sm_features, 50),
ejabberd_hooks:add(disco_sm_identity, Host,
?MODULE, get_sm_identity, 50),
ejabberd_hooks:add(disco_sm_items, Host,
?MODULE, get_sm_items, 50),
ejabberd_hooks:add(disco_info, Host, ?MODULE, get_info, 50),
ejabberd_hooks:add(c2s_handle_info, Host, ?MODULE, c2s_handle_info, 50),
ejabberd_hooks:add(c2s_copy_session, Host, ?MODULE, c2s_copy_session, 50),
ejabberd_hooks:add(webadmin_page_host, Host,
?MODULE, webadmin_page, 50),
ejabberd_hooks:add(webadmin_user, Host,
?MODULE, webadmin_user, 50),
ejabberd_hooks:add(webadmin_user_parse_query, Host,
?MODULE, webadmin_user_parse_query, 50),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host, ?NS_FLEX_OFFLINE,
?MODULE, handle_offline_query).
stop(Host) ->
ejabberd_hooks:delete(offline_message_hook, Host,
?MODULE, store_packet, 50),
ejabberd_hooks:delete(c2s_self_presence, Host, ?MODULE, c2s_self_presence, 50),
ejabberd_hooks:delete(remove_user, Host, ?MODULE,
remove_user, 50),
ejabberd_hooks:delete(disco_sm_features, Host, ?MODULE, get_sm_features, 50),
ejabberd_hooks:delete(disco_local_features, Host, ?MODULE, get_sm_features, 50),
ejabberd_hooks:delete(disco_sm_identity, Host, ?MODULE, get_sm_identity, 50),
ejabberd_hooks:delete(disco_sm_items, Host, ?MODULE, get_sm_items, 50),
ejabberd_hooks:delete(disco_info, Host, ?MODULE, get_info, 50),
ejabberd_hooks:delete(c2s_handle_info, Host, ?MODULE, c2s_handle_info, 50),
ejabberd_hooks:delete(c2s_copy_session, Host, ?MODULE, c2s_copy_session, 50),
ejabberd_hooks:delete(webadmin_page_host, Host,
?MODULE, webadmin_page, 50),
ejabberd_hooks:delete(webadmin_user, Host,
?MODULE, webadmin_user, 50),
ejabberd_hooks:delete(webadmin_user_parse_query, Host,
?MODULE, webadmin_user_parse_query, 50),
gen_iq_handler:remove_iq_handler(ejabberd_sm, Host, ?NS_FLEX_OFFLINE).
reload(Host, NewOpts, OldOpts) ->
NewMod = gen_mod:db_mod(NewOpts, ?MODULE),
OldMod = gen_mod:db_mod(OldOpts, ?MODULE),
init_cache(NewMod, Host, NewOpts),
if NewMod /= OldMod ->
NewMod:init(Host, NewOpts);
true ->
ok
end.
init_cache(Mod, Host, Opts) ->
CacheOpts = [{max_size, mod_offline_opt:cache_size(Opts)},
{life_time, mod_offline_opt:cache_life_time(Opts)},
{cache_missed, false}],
case use_cache(Mod, Host) of
true ->
ets_cache:new(?SPOOL_COUNTER_CACHE, CacheOpts);
false ->
ets_cache:delete(?SPOOL_COUNTER_CACHE)
end.
-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 -> mod_offline_opt: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.
-spec flush_cache(module(), binary(), binary()) -> ok.
flush_cache(Mod, User, Server) ->
case use_cache(Mod, Server) of
true ->
ets_cache:delete(?SPOOL_COUNTER_CACHE,
{User, Server},
cache_nodes(Mod, Server));
false ->
ok
end.
-spec store_offline_msg(#offline_msg{}) -> ok | {error, full | any()}.
store_offline_msg(#offline_msg{us = {User, Server}, packet = Pkt} = Msg) ->
UseMam = use_mam_for_user(User, Server),
Mod = gen_mod:db_mod(Server, ?MODULE),
case UseMam andalso xmpp:get_meta(Pkt, mam_archived, false) of
true ->
case count_offline_messages(User, Server) of
0 ->
store_message_in_db(Mod, Msg);
_ ->
case use_cache(Mod, Server) of
true ->
ets_cache:incr(
?SPOOL_COUNTER_CACHE,
{User, Server}, 1,
cache_nodes(Mod, Server));
false ->
ok
end
end;
false ->
case get_max_user_messages(User, Server) of
infinity ->
store_message_in_db(Mod, Msg);
Limit ->
Num = count_offline_messages(User, Server),
if Num < Limit ->
store_message_in_db(Mod, Msg);
true ->
{error, full}
end
end
end.
get_max_user_messages(User, Server) ->
Access = mod_offline_opt:access_max_user_messages(Server),
case ejabberd_shaper:match(Server, Access, jid:make(User, Server)) of
Max when is_integer(Max) -> Max;
infinity -> infinity;
_ -> ?MAX_USER_MESSAGES
end.
get_sm_features(Acc, _From, _To, <<"">>, _Lang) ->
Feats = case Acc of
{result, I} -> I;
_ -> []
end,
{result, Feats ++ [?NS_FEATURE_MSGOFFLINE, ?NS_FLEX_OFFLINE]};
get_sm_features(_Acc, _From, _To, ?NS_FEATURE_MSGOFFLINE, _Lang) ->
%% override all lesser features...
{result, []};
get_sm_features(_Acc, #jid{luser = U, lserver = S}, #jid{luser = U, lserver = S},
?NS_FLEX_OFFLINE, _Lang) ->
{result, [?NS_FLEX_OFFLINE]};
get_sm_features(Acc, _From, _To, _Node, _Lang) ->
Acc.
get_sm_identity(Acc, #jid{luser = U, lserver = S}, #jid{luser = U, lserver = S},
?NS_FLEX_OFFLINE, _Lang) ->
[#identity{category = <<"automation">>,
type = <<"message-list">>}|Acc];
get_sm_identity(Acc, _From, _To, _Node, _Lang) ->
Acc.
get_sm_items(_Acc, #jid{luser = U, lserver = S} = JID,
#jid{luser = U, lserver = S},
?NS_FLEX_OFFLINE, _Lang) ->
ejabberd_sm:route(JID, {resend_offline, false}),
Mod = gen_mod:db_mod(S, ?MODULE),
Hdrs = case Mod:read_message_headers(U, S) of
L when is_list(L) ->
L;
_ ->
[]
end,
BareJID = jid:remove_resource(JID),
{result, lists:map(
fun({Seq, From, _To, _TS, _El}) ->
Node = integer_to_binary(Seq),
#disco_item{jid = BareJID,
node = Node,
name = jid:encode(From)}
end, Hdrs)};
get_sm_items(Acc, _From, _To, _Node, _Lang) ->
Acc.
-spec get_info([xdata()], binary(), module(), binary(), binary()) -> [xdata()];
([xdata()], jid(), jid(), binary(), binary()) -> [xdata()].
get_info(_Acc, #jid{luser = U, lserver = S} = JID,
#jid{luser = U, lserver = S}, ?NS_FLEX_OFFLINE, Lang) ->
ejabberd_sm:route(JID, {resend_offline, false}),
[#xdata{type = result,
fields = flex_offline:encode(
[{number_of_messages, count_offline_messages(U, S)}],
Lang)}];
get_info(Acc, _From, _To, _Node, _Lang) ->
Acc.
-spec c2s_handle_info(c2s_state(), term()) -> c2s_state().
c2s_handle_info(State, {resend_offline, Flag}) ->
{stop, State#{resend_offline => Flag}};
c2s_handle_info(State, _) ->
State.
-spec c2s_copy_session(c2s_state(), c2s_state()) -> c2s_state().
c2s_copy_session(State, #{resend_offline := Flag}) ->
State#{resend_offline => Flag};
c2s_copy_session(State, _) ->
State.
-spec handle_offline_query(iq()) -> iq().
handle_offline_query(#iq{from = #jid{luser = U1, lserver = S1},
to = #jid{luser = U2, lserver = S2},
lang = Lang,
sub_els = [#offline{}]} = IQ)
when {U1, S1} /= {U2, S2} ->
Txt = ?T("Query to another users is forbidden"),
xmpp:make_error(IQ, xmpp:err_forbidden(Txt, Lang));
handle_offline_query(#iq{from = #jid{luser = U, lserver = S} = From,
to = #jid{luser = U, lserver = S} = _To,
type = Type, lang = Lang,
sub_els = [#offline{} = Offline]} = IQ) ->
case {Type, Offline} of
{get, #offline{fetch = true, items = [], purge = false}} ->
%% TODO: report database errors
handle_offline_fetch(From),
xmpp:make_iq_result(IQ);
{get, #offline{fetch = false, items = [_|_] = Items, purge = false}} ->
case handle_offline_items_view(From, Items) of
true -> xmpp:make_iq_result(IQ);
false -> xmpp:make_error(IQ, xmpp:err_item_not_found())
end;
{set, #offline{fetch = false, items = [], purge = true}} ->
case delete_all_msgs(U, S) of
{atomic, ok} ->
xmpp:make_iq_result(IQ);
_Err ->
Txt = ?T("Database failure"),
xmpp:make_error(IQ, xmpp:err_internal_server_error(Txt, Lang))
end;
{set, #offline{fetch = false, items = [_|_] = Items, purge = false}} ->
case handle_offline_items_remove(From, Items) of
true -> xmpp:make_iq_result(IQ);
false -> xmpp:make_error(IQ, xmpp:err_item_not_found())
end;
_ ->
xmpp:make_error(IQ, xmpp:err_bad_request())
end;
handle_offline_query(#iq{lang = Lang} = IQ) ->
Txt = ?T("No module is handling this query"),
xmpp:make_error(IQ, xmpp:err_service_unavailable(Txt, Lang)).
-spec handle_offline_items_view(jid(), [offline_item()]) -> boolean().
handle_offline_items_view(JID, Items) ->
{U, S, R} = jid:tolower(JID),
case use_mam_for_user(U, S) of
true ->
false;
_ ->
lists:foldl(
fun(#offline_item{node = Node, action = view}, Acc) ->
case fetch_msg_by_node(JID, Node) of
{ok, OfflineMsg} ->
case offline_msg_to_route(S, OfflineMsg) of
{route, El} ->
NewEl = set_offline_tag(El, Node),
case ejabberd_sm:get_session_pid(U, S, R) of
Pid when is_pid(Pid) ->
ejabberd_c2s:route(Pid, {route, NewEl});
none ->
ok
end,
Acc or true;
error ->
Acc or false
end;
error ->
Acc or false
end
end, false, Items) end.
-spec handle_offline_items_remove(jid(), [offline_item()]) -> boolean().
handle_offline_items_remove(JID, Items) ->
{U, S, _R} = jid:tolower(JID),
case use_mam_for_user(U, S) of
true ->
false;
_ ->
lists:foldl(
fun(#offline_item{node = Node, action = remove}, Acc) ->
Acc or remove_msg_by_node(JID, Node)
end, false, Items)
end.
-spec set_offline_tag(message(), binary()) -> message().
set_offline_tag(Msg, Node) ->
xmpp:set_subtag(Msg, #offline{items = [#offline_item{node = Node}]}).
-spec handle_offline_fetch(jid()) -> ok.
handle_offline_fetch(#jid{luser = U, lserver = S} = JID) ->
ejabberd_sm:route(JID, {resend_offline, false}),
lists:foreach(
fun({Node, El}) ->
El1 = set_offline_tag(El, Node),
ejabberd_router:route(El1)
end, read_messages(U, S)).
-spec fetch_msg_by_node(jid(), binary()) -> error | {ok, #offline_msg{}}.
fetch_msg_by_node(To, Seq) ->
case catch binary_to_integer(Seq) of
I when is_integer(I), I >= 0 ->
LUser = To#jid.luser,
LServer = To#jid.lserver,
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:read_message(LUser, LServer, I);
_ ->
error
end.
-spec remove_msg_by_node(jid(), binary()) -> boolean().
remove_msg_by_node(To, Seq) ->
case catch binary_to_integer(Seq) of
I when is_integer(I), I>= 0 ->
LUser = To#jid.luser,
LServer = To#jid.lserver,
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:remove_message(LUser, LServer, I),
flush_cache(Mod, LUser, LServer),
true;
_ ->
false
end.
-spec need_to_store(binary(), message()) -> boolean().
need_to_store(_LServer, #message{type = error}) -> false;
need_to_store(LServer, #message{type = Type} = Packet) ->
case xmpp:has_subtag(Packet, #offline{}) of
false ->
case misc:unwrap_mucsub_message(Packet) of
#message{type = groupchat} = Msg ->
need_to_store(LServer, Msg#message{type = chat});
#message{} = Msg ->
need_to_store(LServer, Msg);
_ ->
case check_store_hint(Packet) of
store ->
true;
no_store ->
false;
none ->
Store = case Type of
groupchat ->
mod_offline_opt:store_groupchat(LServer);
headline ->
false;
_ ->
true
end,
case {Store, mod_offline_opt:store_empty_body(LServer)} of
{false, _} ->
false;
{_, true} ->
true;
{_, false} ->
Packet#message.body /= [];
{_, unless_chat_state} ->
not misc:is_standalone_chat_state(Packet)
end
end
end;
true ->
false
end.
-spec store_packet({any(), message()}) -> {any(), message()}.
store_packet({_Action, #message{from = From, to = To} = Packet} = Acc) ->
case need_to_store(To#jid.lserver, Packet) of
true ->
case check_event(Packet) of
true ->
#jid{luser = LUser, lserver = LServer} = To,
TimeStamp = erlang:timestamp(),
Expire = find_x_expire(TimeStamp, Packet),
OffMsg = #offline_msg{us = {LUser, LServer},
timestamp = TimeStamp,
expire = Expire,
from = From,
to = To,
packet = Packet},
case store_offline_msg(OffMsg) of
ok ->
{offlined, Packet};
{error, Reason} ->
discard_warn_sender(Packet, Reason),
stop
end;
_ ->
maybe_update_cache(To, Packet),
Acc
end;
false ->
maybe_update_cache(To, Packet),
Acc
end.
-spec maybe_update_cache(jid(), message()) -> ok.
maybe_update_cache(#jid{lserver = Server, luser = User}, Packet) ->
case xmpp:get_meta(Packet, mam_archived, false) of
true ->
Mod = gen_mod:db_mod(Server, ?MODULE),
case use_mam_for_user(User, Server) andalso use_cache(Mod, Server) of
true ->
ets_cache:incr(
?SPOOL_COUNTER_CACHE,
{User, Server}, 1,
cache_nodes(Mod, Server));
_ ->
ok
end;
_ ->
ok
end.
-spec check_store_hint(message()) -> store | no_store | none.
check_store_hint(Packet) ->
case has_store_hint(Packet) of
true ->
store;
false ->
case has_no_store_hint(Packet) of
true ->
no_store;
false ->
none
end
end.
-spec has_store_hint(message()) -> boolean().
has_store_hint(Packet) ->
xmpp:has_subtag(Packet, #hint{type = 'store'}).
-spec has_no_store_hint(message()) -> boolean().
has_no_store_hint(Packet) ->
xmpp:has_subtag(Packet, #hint{type = 'no-store'})
orelse
xmpp:has_subtag(Packet, #hint{type = 'no-storage'}).
%% Check if the packet has any content about XEP-0022
-spec check_event(message()) -> boolean().
check_event(#message{from = From, to = To, id = ID, type = Type} = Msg) ->
case xmpp:get_subtag(Msg, #xevent{}) of
false ->
true;
#xevent{id = undefined, offline = false} ->
true;
#xevent{id = undefined, offline = true} ->
NewMsg = #message{from = To, to = From, id = ID, type = Type,
sub_els = [#xevent{id = ID, offline = true}]},
ejabberd_router:route(NewMsg),
true;
% Don't store composing events
#xevent{id = V, composing = true} when V /= undefined ->
false;
% Nor composing stopped events
#xevent{id = V, composing = false, delivered = false,
displayed = false, offline = false} when V /= undefined ->
false;
% But store other received notifications
#xevent{id = V} when V /= undefined ->
true;
_ ->
false
end.
-spec find_x_expire(erlang:timestamp(), message()) -> erlang:timestamp() | never.
find_x_expire(TimeStamp, Msg) ->
case xmpp:get_subtag(Msg, #expire{seconds = 0}) of
#expire{seconds = Int} ->
{MegaSecs, Secs, MicroSecs} = TimeStamp,
S = MegaSecs * 1000000 + Secs + Int,
MegaSecs1 = S div 1000000,
Secs1 = S rem 1000000,
{MegaSecs1, Secs1, MicroSecs};
false ->
never
end.
c2s_self_presence({_Pres, #{resend_offline := false}} = Acc) ->
Acc;
c2s_self_presence({#presence{type = available} = NewPres, State} = Acc) ->
NewPrio = get_priority_from_presence(NewPres),
LastPrio = case maps:get(pres_last, State, undefined) of
undefined -> -1;
LastPres -> get_priority_from_presence(LastPres)
end,
if LastPrio < 0 andalso NewPrio >= 0 ->
route_offline_messages(State);
true ->
ok
end,
Acc;
c2s_self_presence(Acc) ->
Acc.
-spec route_offline_messages(c2s_state()) -> ok.
route_offline_messages(#{jid := #jid{luser = LUser, lserver = LServer}} = State) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Msgs = case Mod:pop_messages(LUser, LServer) of
{ok, OffMsgs} ->
case use_mam_for_user(LUser, LServer) of
true ->
flush_cache(Mod, LUser, LServer),
lists:map(
fun({_, #message{from = From, to = To} = Msg}) ->
#offline_msg{from = From, to = To,
us = {LUser, LServer},
packet = Msg}
end, read_mam_messages(LUser, LServer, OffMsgs));
_ ->
flush_cache(Mod, LUser, LServer),
OffMsgs
end;
_ ->
[]
end,
lists:foreach(
fun(OffMsg) ->
route_offline_message(State, OffMsg)
end, Msgs).
-spec route_offline_message(c2s_state(), #offline_msg{}) -> ok.
route_offline_message(#{lserver := LServer} = State,
#offline_msg{expire = Expire} = OffMsg) ->
case offline_msg_to_route(LServer, OffMsg) of
error ->
ok;
{route, Msg} ->
case is_message_expired(Expire, Msg) of
true ->
ok;
false ->
case privacy_check_packet(State, Msg, in) of
allow -> ejabberd_router:route(Msg);
deny -> ok
end
end
end.
-spec is_message_expired(erlang:timestamp() | never, message()) -> boolean().
is_message_expired(Expire, Msg) ->
TS = erlang:timestamp(),
Expire1 = case Expire of
undefined -> find_x_expire(TS, Msg);
_ -> Expire
end,
Expire1 /= never andalso Expire1 =< TS.
-spec privacy_check_packet(c2s_state(), stanza(), in | out) -> allow | deny.
privacy_check_packet(#{lserver := LServer} = State, Pkt, Dir) ->
ejabberd_hooks:run_fold(privacy_check_packet,
LServer, allow, [State, Pkt, Dir]).
remove_expired_messages(Server) ->
LServer = jid:nameprep(Server),
Mod = gen_mod:db_mod(LServer, ?MODULE),
case erlang:function_exported(Mod, remove_expired_messages, 1) of
true ->
Ret = Mod:remove_expired_messages(LServer),
ets_cache:clear(?SPOOL_COUNTER_CACHE),
Ret;
false ->
erlang:error(not_implemented)
end.
remove_old_messages(Days, Server) ->
LServer = jid:nameprep(Server),
Mod = gen_mod:db_mod(LServer, ?MODULE),
case erlang:function_exported(Mod, remove_old_messages, 2) of
true ->
Ret = Mod:remove_old_messages(Days, LServer),
ets_cache:clear(?SPOOL_COUNTER_CACHE),
Ret;
false ->
erlang:error(not_implemented)
end.
-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),
flush_cache(Mod, LUser, LServer).
%% Helper functions:
-spec check_if_message_should_be_bounced(message()) -> boolean().
check_if_message_should_be_bounced(Packet) ->
case Packet of
#message{type = groupchat, to = #jid{lserver = LServer}} ->
mod_offline_opt:bounce_groupchat(LServer);
#message{to = #jid{lserver = LServer}} ->
case misc:is_mucsub_message(Packet) of
true ->
mod_offline_opt:bounce_groupchat(LServer);
_ ->
true
end;
_ ->
true
end.
%% Warn senders that their messages have been discarded:
-spec discard_warn_sender(message(), full | any()) -> ok.
discard_warn_sender(Packet, Reason) ->
case check_if_message_should_be_bounced(Packet) of
true ->
Lang = xmpp:get_lang(Packet),
Err = case Reason of
full ->
ErrText = ?T("Your contact offline message queue is "
"full. The message has been discarded."),
xmpp:err_resource_constraint(ErrText, Lang);
_ ->
ErrText = ?T("Database failure"),
xmpp:err_internal_server_error(ErrText, Lang)
end,
ejabberd_router:route_error(Packet, Err);
_ ->
ok
end.
webadmin_page(_, Host,
#request{us = _US, path = [<<"user">>, U, <<"queue">>],
q = Query, lang = Lang} =
_Request) ->
Res = user_queue(U, Host, Query, Lang), {stop, Res};
webadmin_page(Acc, _, _) -> Acc.
get_offline_els(LUser, LServer) ->
[Packet || {_Seq, Packet} <- read_messages(LUser, LServer)].
-spec offline_msg_to_route(binary(), #offline_msg{}) ->
{route, message()} | error.
offline_msg_to_route(LServer, #offline_msg{from = From, to = To} = R) ->
CodecOpts = ejabberd_config:codec_options(),
try xmpp:decode(R#offline_msg.packet, ?NS_CLIENT, CodecOpts) of
Pkt ->
Pkt1 = xmpp:set_from_to(Pkt, From, To),
Pkt2 = add_delay_info(Pkt1, LServer, R#offline_msg.timestamp),
{route, Pkt2}
catch _:{xmpp_codec, Why} ->
?ERROR_MSG("Failed to decode packet ~p of user ~ts: ~ts",
[R#offline_msg.packet, jid:encode(To),
xmpp:format_error(Why)]),
error
end.
-spec read_messages(binary(), binary()) -> [{binary(), message()}].
read_messages(LUser, LServer) ->
Res = case read_db_messages(LUser, LServer) of
error ->
[];
L when is_list(L) ->
L
end,
case use_mam_for_user(LUser, LServer) of
true ->
read_mam_messages(LUser, LServer, Res);
_ ->
Res
end.
-spec read_db_messages(binary(), binary()) -> [{binary(), message()}] | error.
read_db_messages(LUser, LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
CodecOpts = ejabberd_config:codec_options(),
case Mod:read_message_headers(LUser, LServer) of
error ->
error;
L ->
lists:flatmap(
fun({Seq, From, To, TS, El}) ->
Node = integer_to_binary(Seq),
try xmpp:decode(El, ?NS_CLIENT, CodecOpts) of
Pkt ->
Node = integer_to_binary(Seq),
Pkt1 = add_delay_info(Pkt, LServer, TS),
Pkt2 = xmpp:set_from_to(Pkt1, From, To),
[{Node, Pkt2}]
catch _:{xmpp_codec, Why} ->
?ERROR_MSG("Failed to decode packet ~p "
"of user ~ts: ~ts",
[El, jid:encode(To),
xmpp:format_error(Why)]),
[]
end
end, L)
end.
-spec parse_marker_messages(binary(), [#offline_msg{} | {any(), message()}]) ->
{integer() | none, [message()]}.
parse_marker_messages(LServer, ReadMsgs) ->
{Timestamp, ExtraMsgs} = lists:foldl(
fun({_Node, #message{id = <<"ActivityMarker">>,
body = [], type = error} = Msg}, {T, E}) ->
case xmpp:get_subtag(Msg, #delay{stamp = {0,0,0}}) of
#delay{stamp = Time} ->
if T == none orelse T > Time ->
{Time, E};
true ->
{T, E}
end
end;
(#offline_msg{from = From, to = To, timestamp = TS, packet = Pkt},
{T, E}) ->
try xmpp:decode(Pkt) of
#message{id = <<"ActivityMarker">>,
body = [], type = error} = Msg ->
TS2 = case TS of
undefined ->
case xmpp:get_subtag(Msg, #delay{stamp = {0,0,0}}) of
#delay{stamp = TS0} ->
TS0;
_ ->
erlang:timestamp()
end;
_ ->
TS
end,
if T == none orelse T > TS2 ->
{TS2, E};
true ->
{T, E}
end;
Decoded ->
Pkt1 = add_delay_info(Decoded, LServer, TS),
{T, [xmpp:set_from_to(Pkt1, From, To) | E]}
catch _:{xmpp_codec, _Why} ->
{T, E}
end;
({_Node, Msg}, {T, E}) ->
{T, [Msg | E]}
end, {none, []}, ReadMsgs),
Start = case {Timestamp, ExtraMsgs} of
{none, [First|_]} ->
case xmpp:get_subtag(First, #delay{stamp = {0,0,0}}) of
#delay{stamp = {Mega, Sec, Micro}} ->
{Mega, Sec, Micro+1};
_ ->
none
end;
{none, _} ->
none;
_ ->
Timestamp
end,
{Start, ExtraMsgs}.
-spec read_mam_messages(binary(), binary(), [#offline_msg{} | {any(), message()}]) ->
[{integer(), message()}].
read_mam_messages(LUser, LServer, ReadMsgs) ->
{Start, ExtraMsgs} = parse_marker_messages(LServer, ReadMsgs),
AllMsgs = case Start of
none ->
ExtraMsgs;
_ ->
MaxOfflineMsgs = case get_max_user_messages(LUser, LServer) of
Number when is_integer(Number) ->
max(0, Number - length(ExtraMsgs));
infinity ->
undefined
end,
JID = jid:make(LUser, LServer, <<>>),
{MamMsgs, _, _} = mod_mam:select(LServer, JID, JID,
[{start, Start}],
#rsm_set{max = MaxOfflineMsgs,
before = <<"9999999999999999">>},
chat, only_messages),
MamMsgs2 = lists:map(
fun({_, _, #forwarded{sub_els = [MM | _], delay = #delay{stamp = MMT}}}) ->
add_delay_info(MM, LServer, MMT)
end, MamMsgs),
ExtraMsgs ++ MamMsgs2
end,
AllMsgs2 = lists:sort(
fun(A, B) ->
DA = case xmpp:get_subtag(A, #stanza_id{by = #jid{}}) of
#stanza_id{id = IDA} ->
IDA;
_ -> case xmpp:get_subtag(A, #delay{stamp = {0,0,0}}) of
#delay{stamp = STA} ->
integer_to_binary(misc:now_to_usec(STA));
_ ->
<<"unknown">>
end
end,
DB = case xmpp:get_subtag(B, #stanza_id{by = #jid{}}) of
#stanza_id{id = IDB} ->
IDB;
_ -> case xmpp:get_subtag(B, #delay{stamp = {0,0,0}}) of
#delay{stamp = STB} ->
integer_to_binary(misc:now_to_usec(STB));
_ ->
<<"unknown">>
end
end,
DA < DB
end, AllMsgs),
{AllMsgs3, _} = lists:mapfoldl(
fun(Msg, Counter) ->
{{Counter, Msg}, Counter + 1}
end, 1, AllMsgs2),
AllMsgs3.
-spec count_mam_messages(binary(), binary(), [#offline_msg{} | {any(), message()}] | error) ->
{cache, integer()} | {nocache, integer()}.
count_mam_messages(_LUser, _LServer, error) ->
{nocache, 0};
count_mam_messages(LUser, LServer, ReadMsgs) ->
{Start, ExtraMsgs} = parse_marker_messages(LServer, ReadMsgs),
case Start of
none ->
{cache, length(ExtraMsgs)};
_ ->
MaxOfflineMsgs = case get_max_user_messages(LUser, LServer) of
Number when is_integer(Number) -> Number - length(ExtraMsgs);
infinity -> undefined
end,
JID = jid:make(LUser, LServer, <<>>),
{_, _, Count} = mod_mam:select(LServer, JID, JID,
[{start, Start}],
#rsm_set{max = MaxOfflineMsgs,
before = <<"9999999999999999">>},
chat, only_count),
{cache, Count + length(ExtraMsgs)}
end.
format_user_queue(Hdrs) ->
lists:map(
fun({Seq, From, To, TS, El}) ->
ID = integer_to_binary(Seq),
FPacket = ejabberd_web_admin:pretty_print_xml(El),
SFrom = jid:encode(From),
STo = jid:encode(To),
Time = case TS of
undefined ->
Stamp = fxml:get_path_s(El, [{elem, <<"delay">>},
{attr, <<"stamp">>}]),
try xmpp_util:decode_timestamp(Stamp) of
{_, _, _} = Now -> format_time(Now)
catch _:_ ->
<<"">>
end;
{_, _, _} = Now ->
format_time(Now)
end,
?XE(<<"tr">>,
[?XAE(<<"td">>, [{<<"class">>, <<"valign">>}],
[?INPUT(<<"checkbox">>, <<"selected">>, ID)]),
?XAC(<<"td">>, [{<<"class">>, <<"valign">>}], Time),
?XAC(<<"td">>, [{<<"class">>, <<"valign">>}], SFrom),
?XAC(<<"td">>, [{<<"class">>, <<"valign">>}], STo),
?XAE(<<"td">>, [{<<"class">>, <<"valign">>}],
[?XC(<<"pre">>, FPacket)])])
end, Hdrs).
format_time(Now) ->
{{Year, Month, Day}, {Hour, Minute, Second}} = calendar:now_to_local_time(Now),
str:format("~w-~.2.0w-~.2.0w ~.2.0w:~.2.0w:~.2.0w",
[Year, Month, Day, Hour, Minute, Second]).
user_queue(User, Server, Query, Lang) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
US = {LUser, LServer},
Mod = gen_mod:db_mod(LServer, ?MODULE),
user_queue_parse_query(LUser, LServer, Query),
HdrsAll = case Mod:read_message_headers(LUser, LServer) of
error -> [];
L -> L
end,
Hdrs = get_messages_subset(User, Server, HdrsAll),
FMsgs = format_user_queue(Hdrs),
PageTitle = str:translate_and_format(Lang, ?T("~ts's Offline Messages Queue"), [us_to_list(US)]),
(?H1GL(PageTitle, <<"modules/#mod-offline">>, <<"mod_offline">>))
++ [?XREST(?T("Submitted"))] ++
[?XAE(<<"form">>,
[{<<"action">>, <<"">>}, {<<"method">>, <<"post">>}],
[?XE(<<"table">>,
[?XE(<<"thead">>,
[?XE(<<"tr">>,
[?X(<<"td">>), ?XCT(<<"td">>, ?T("Time")),
?XCT(<<"td">>, ?T("From")),
?XCT(<<"td">>, ?T("To")),
?XCT(<<"td">>, ?T("Packet"))])]),
?XE(<<"tbody">>,
if FMsgs == [] ->
[?XE(<<"tr">>,
[?XAC(<<"td">>, [{<<"colspan">>, <<"4">>}],
<<" ">>)])];
true -> FMsgs
end)]),
?BR,
?INPUTTD(<<"submit">>, <<"delete">>,
?T("Delete Selected"))])].
user_queue_parse_query(LUser, LServer, Query) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
case lists:keysearch(<<"delete">>, 1, Query) of
{value, _} ->
case user_queue_parse_query(LUser, LServer, Query, Mod, false) of
true ->
flush_cache(Mod, LUser, LServer);
false ->
ok
end;
_ ->
ok
end.
user_queue_parse_query(LUser, LServer, Query, Mod, Acc) ->
case lists:keytake(<<"selected">>, 1, Query) of
{value, {_, Seq}, Query2} ->
NewAcc = case catch binary_to_integer(Seq) of
I when is_integer(I), I>=0 ->
Mod:remove_message(LUser, LServer, I),
true;
_ ->
Acc
end,
user_queue_parse_query(LUser, LServer, Query2, Mod, NewAcc);
false ->
Acc
end.
us_to_list({User, Server}) ->
jid:encode({User, Server, <<"">>}).
get_queue_length(LUser, LServer) ->
count_offline_messages(LUser, LServer).
get_messages_subset(User, Host, MsgsAll) ->
MaxOfflineMsgs = case get_max_user_messages(User, Host) of
Number when is_integer(Number) -> Number;
_ -> 100
end,
Length = length(MsgsAll),
get_messages_subset2(MaxOfflineMsgs, Length, MsgsAll).
get_messages_subset2(Max, Length, MsgsAll) when Length =< Max * 2 ->
MsgsAll;
get_messages_subset2(Max, Length, MsgsAll) ->
FirstN = Max,
{MsgsFirstN, Msgs2} = lists:split(FirstN, MsgsAll),
MsgsLastN = lists:nthtail(Length - FirstN - FirstN,
Msgs2),
NoJID = jid:make(<<"...">>, <<"...">>),
Seq = <<"0">>,
IntermediateMsg = #xmlel{name = <<"...">>, attrs = [],
children = []},
MsgsFirstN ++ [{Seq, NoJID, NoJID, IntermediateMsg}] ++ MsgsLastN.
webadmin_user(Acc, User, Server, Lang) ->
QueueLen = count_offline_messages(jid:nodeprep(User),
jid:nameprep(Server)),
FQueueLen = ?C(integer_to_binary(QueueLen)),
FQueueView = ?AC(<<"queue/">>,
?T("View Queue")),
Acc ++
[?XCT(<<"h3">>, ?T("Offline Messages:")),
FQueueLen,
?C(<<" | ">>),
FQueueView,
?C(<<" | ">>),
?INPUTTD(<<"submit">>, <<"removealloffline">>,
?T("Remove All Offline Messages"))].
-spec delete_all_msgs(binary(), binary()) -> {atomic, any()}.
delete_all_msgs(User, Server) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
Mod = gen_mod:db_mod(LServer, ?MODULE),
Ret = Mod:remove_all_messages(LUser, LServer),
flush_cache(Mod, LUser, LServer),
Ret.
webadmin_user_parse_query(_, <<"removealloffline">>,
User, Server, _Query) ->
case delete_all_msgs(User, Server) of
{atomic, ok} ->
?INFO_MSG("Removed all offline messages for ~ts@~ts",
[User, Server]),
{stop, ok};
Err ->
?ERROR_MSG("Failed to remove offline messages: ~p",
[Err]),
{stop, error}
end;
webadmin_user_parse_query(Acc, _Action, _User, _Server,
_Query) ->
Acc.
%% Returns as integer the number of offline messages for a given user
-spec count_offline_messages(binary(), binary()) -> non_neg_integer().
count_offline_messages(User, Server) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
Mod = gen_mod:db_mod(LServer, ?MODULE),
case use_mam_for_user(User, Server) of
true ->
case use_cache(Mod, LServer) of
true ->
ets_cache:lookup(
?SPOOL_COUNTER_CACHE, {LUser, LServer},
fun() ->
Res = read_db_messages(LUser, LServer),
count_mam_messages(LUser, LServer, Res)
end);
false ->
Res = read_db_messages(LUser, LServer),
ets_cache:untag(count_mam_messages(LUser, LServer, Res))
end;
_ ->
case use_cache(Mod, LServer) of
true ->
ets_cache:lookup(
?SPOOL_COUNTER_CACHE, {LUser, LServer},
fun() ->
Mod:count_messages(LUser, LServer)
end);
false ->
ets_cache:untag(Mod:count_messages(LUser, LServer))
end
end.
-spec store_message_in_db(module(), #offline_msg{}) -> ok | {error, any()}.
store_message_in_db(Mod, #offline_msg{us = {User, Server}} = Msg) ->
case Mod:store_message(Msg) of
ok ->
case use_cache(Mod, Server) of
true ->
ets_cache:incr(
?SPOOL_COUNTER_CACHE,
{User, Server}, 1,
cache_nodes(Mod, Server));
false ->
ok
end;
Err ->
Err
end.
-spec add_delay_info(message(), binary(),
undefined | erlang:timestamp()) -> message().
add_delay_info(Packet, LServer, TS) ->
NewTS = case TS of
undefined -> erlang:timestamp();
_ -> TS
end,
Packet1 = xmpp:put_meta(Packet, from_offline, true),
misc:add_delay_info(Packet1, jid:make(LServer), NewTS,
<<"Offline storage">>).
-spec get_priority_from_presence(presence()) -> integer().
get_priority_from_presence(#presence{priority = Prio}) ->
case Prio of
undefined -> 0;
_ -> Prio
end.
export(LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:export(LServer).
import_info() ->
[{<<"spool">>, 4}].
import_start(LServer, DBType) ->
Mod = gen_mod:db_mod(DBType, ?MODULE),
Mod:import(LServer, []).
import(LServer, {sql, _}, DBType, <<"spool">>,
[LUser, XML, _Seq, _TimeStamp]) ->
El = fxml_stream:parse_element(XML),
#message{from = From, to = To} = Msg = xmpp:decode(El, ?NS_CLIENT, [ignore_els]),
TS = case xmpp:get_subtag(Msg, #delay{stamp = {0,0,0}}) of
#delay{stamp = {MegaSecs, Secs, _}} ->
{MegaSecs, Secs, 0};
false ->
erlang:timestamp()
end,
US = {LUser, LServer},
Expire = find_x_expire(TS, Msg),
OffMsg = #offline_msg{us = US, packet = El,
from = From, to = To,
timestamp = TS, expire = Expire},
Mod = gen_mod:db_mod(DBType, ?MODULE),
Mod:import(OffMsg).
use_mam_for_user(_User, Server) ->
mod_offline_opt:use_mam_for_storage(Server).
mod_opt_type(access_max_user_messages) ->
econf:shaper();
mod_opt_type(store_groupchat) ->
econf:bool();
mod_opt_type(bounce_groupchat) ->
econf:bool();
mod_opt_type(use_mam_for_storage) ->
econf:bool();
mod_opt_type(store_empty_body) ->
econf:either(
unless_chat_state,
econf:bool());
mod_opt_type(db_type) ->
econf:db_type(?MODULE);
mod_opt_type(use_cache) ->
econf:bool();
mod_opt_type(cache_size) ->
econf:pos_int(infinity);
mod_opt_type(cache_life_time) ->
econf:timeout(second, infinity).
mod_options(Host) ->
[{db_type, ejabberd_config:default_db(Host, ?MODULE)},
{access_max_user_messages, max_user_offline_messages},
{store_empty_body, unless_chat_state},
{use_mam_for_storage, false},
{bounce_groupchat, false},
{store_groupchat, false},
{use_cache, ejabberd_option:use_cache(Host)},
{cache_size, ejabberd_option:cache_size(Host)},
{cache_life_time, ejabberd_option:cache_life_time(Host)}].
mod_doc() ->
#{desc =>
[?T("This module implements "
"https://xmpp.org/extensions/xep-0160.html"
"[XEP-0160: Best Practices for Handling Offline Messages] "
"and https://xmpp.org/extensions/xep-0013.html"
"[XEP-0013: Flexible Offline Message Retrieval]. "
"This means that all messages sent to an offline user "
"will be stored on the server until that user comes online "
"again. Thus it is very similar to how email works. A user "
"is considered offline if no session presence priority > 0 "
"are currently open."), "",
?T("NOTE: 'ejabberdctl' has a command to "
"delete expired messages (see chapter "
"https://docs.ejabberd.im/admin/guide/managing"
"[Managing an ejabberd server] in online documentation.")],
opts =>
[{access_max_user_messages,
#{value => ?T("AccessName"),
desc =>
?T("This option defines which access rule will be "
"enforced to limit the maximum number of offline "
"messages that a user can have (quota). When a user "
"has too many offline messages, any new messages that "
"they receive are discarded, and a <resource-constraint/> "
"error is returned to the sender. The default value is "
"'max_user_offline_messages'.")}},
{store_empty_body,
#{value => "true | false | unless_chat_state",
desc =>
?T("Whether or not to store messages that lack a <body/> "
"element. The default value is 'unless_chat_state', "
"which tells ejabberd to store messages even if they "
"lack the <body/> element, unless they only contain a "
"chat state notification (as defined in "
"https://xmpp.org/extensions/xep-0085.html"
"[XEP-0085: Chat State Notifications].")}},
{store_groupchat,
#{value => "true | false",
desc =>
?T("Whether or not to store groupchat messages. "
"The default value is 'false'.")}},
{use_mam_for_storage,
#{value => "true | false",
desc =>
?T("This is an experimental option. Enabling this option, "
"'mod_offline' uses the 'mod_mam' archive table instead "
"of its own spool table to retrieve the messages received "
"when the user was offline. This allows client "
"developers to slowly drop XEP-0160 and rely on XEP-0313 "
"instead. It also further reduces the "
"storage required when you enable MucSub. Enabling this "
"option has a known drawback for the moment: most of "
"flexible message retrieval queries don't work (those that "
"allow retrieval/deletion of messages by id), but this "
"specification is not widely used. The default value "
"is 'false' to keep former behaviour as default.")}},
{bounce_groupchat,
#{value => "true | false",
desc =>
?T("This option is use the disable an optimisation that "
"avoids bouncing error messages when groupchat messages "
"could not be stored as offline. It will reduce chat "
"room load, without any drawback in standard use cases. "
"You may change default value only if you have a custom "
"module which uses offline hook after 'mod_offline'. This "
"option can be useful for both standard MUC and MucSub, "
"but the bounce is much more likely to happen in the context "
"of MucSub, so it is even more important to have it on "
"large MucSub services. The default value is 'false', meaning "
"the optimisation is enabled.")}},
{db_type,
#{value => "mnesia | sql",
desc =>
?T("Same as top-level _`default_db`_ option, but applied to this module only.")}},
{use_cache,
#{value => "true | false",
desc =>
?T("Same as top-level _`use_cache`_ option, but applied to this module only.")}},
{cache_size,
#{value => "pos_integer() | infinity",
desc =>
?T("Same as top-level _`cache_size`_ option, but applied to this module only.")}},
{cache_life_time,
#{value => "timeout()",
desc =>
?T("Same as top-level _`cache_life_time`_ option, but applied to this module only.")}}],
example =>
[{?T("This example allows power users to have as much as 5000 "
"offline messages, administrators up to 2000, and all the "
"other users up to 100:"),
["acl:",
" admin:",
" user:",
" - admin1@localhost",
" - admin2@example.org",
" poweruser:",
" user:",
" - bob@example.org",
" - jane@example.org",
"",
"shaper_rules:",
" max_user_offline_messages:",
" - 5000: poweruser",
" - 2000: admin",
" - 100",
"",
"modules:",
" ...",
" mod_offline:",
" access_max_user_messages: max_user_offline_messages",
" ..."
]}]}.
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