%%%----------------------------------------------------------------------
%%% File : mod_vcard_xupdate.erl
%%% Author : Igor Goryachev <igor@goryachev.org>
%%% Purpose : Add avatar hash in presence on behalf of client (XEP-0153)
%%% Created : 9 Mar 2007 by Igor Goryachev <igor@goryachev.org>
%%%----------------------------------------------------------------------
-module(mod_vcard_xupdate).
-behaviour(gen_mod).
%% gen_mod callbacks
-export([start/2, stop/1]).
-export([update_presence/3, vcard_set/3, export/1,
import/1, import/3, mod_opt_type/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
-include("mod_vcard_xupdate.hrl").
-include("jlib.hrl").
-callback init(binary(), gen_mod:opts()) -> any().
-callback import(binary(), #vcard_xupdate{}) -> ok | pass.
-callback add_xupdate(binary(), binary(), binary()) -> {atomic, any()}.
-callback get_xupdate(binary(), binary()) -> binary() | undefined.
-callback remove_xupdate(binary(), binary()) -> {atomic, any()}.
%%====================================================================
%% gen_mod callbacks
%%====================================================================
start(Host, Opts) ->
Mod = gen_mod:db_mod(Host, Opts, ?MODULE),
Mod:init(Host, Opts),
ejabberd_hooks:add(c2s_update_presence, Host, ?MODULE,
update_presence, 100),
ejabberd_hooks:add(vcard_set, Host, ?MODULE, vcard_set,
100),
ok.
stop(Host) ->
ejabberd_hooks:delete(c2s_update_presence, Host,
?MODULE, update_presence, 100),
ejabberd_hooks:delete(vcard_set, Host, ?MODULE,
vcard_set, 100),
ok.
%%====================================================================
%% Hooks
%%====================================================================
update_presence(#xmlel{name = <<"presence">>, attrs = Attrs} = Packet,
User, Host) ->
case fxml:get_attr_s(<<"type">>, Attrs) of
<<>> -> presence_with_xupdate(Packet, User, Host);
_ -> Packet
end;
update_presence(Packet, _User, _Host) -> Packet.
vcard_set(LUser, LServer, VCARD) ->
US = {LUser, LServer},
case fxml:get_path_s(VCARD,
[{elem, <<"PHOTO">>}, {elem, <<"BINVAL">>}, cdata])
of
<<>> -> remove_xupdate(LUser, LServer);
BinVal ->
add_xupdate(LUser, LServer,
p1_sha:sha(jlib:decode_base64(BinVal)))
end,
ejabberd_sm:force_update_presence(US).
%%====================================================================
%% Storage
%%====================================================================
add_xupdate(LUser, LServer, Hash) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:add_xupdate(LUser, LServer, Hash).
get_xupdate(LUser, LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:get_xupdate(LUser, LServer).
remove_xupdate(LUser, LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:remove_xupdate(LUser, LServer).
%%%----------------------------------------------------------------------
%%% Presence stanza rebuilding
%%%----------------------------------------------------------------------
presence_with_xupdate(#xmlel{name = <<"presence">>,
attrs = Attrs, children = Els},
User, Host) ->
XPhotoEl = build_xphotoel(User, Host),
Els2 = presence_with_xupdate2(Els, [], XPhotoEl),
#xmlel{name = <<"presence">>, attrs = Attrs,
children = Els2}.
presence_with_xupdate2([], Els2, XPhotoEl) ->
lists:reverse([XPhotoEl | Els2]);
%% This clause assumes that the x element contains only the XMLNS attribute:
presence_with_xupdate2([#xmlel{name = <<"x">>,
attrs = [{<<"xmlns">>, ?NS_VCARD_UPDATE}]}
| Els],
Els2, XPhotoEl) ->
presence_with_xupdate2(Els, Els2, XPhotoEl);
presence_with_xupdate2([El | Els], Els2, XPhotoEl) ->
presence_with_xupdate2(Els, [El | Els2], XPhotoEl).
build_xphotoel(User, Host) ->
Hash = get_xupdate(User, Host),
PhotoSubEls = case Hash of
Hash when is_binary(Hash) -> [{xmlcdata, Hash}];
_ -> []
end,
PhotoEl = [#xmlel{name = <<"photo">>, attrs = [],
children = PhotoSubEls}],
#xmlel{name = <<"x">>,
attrs = [{<<"xmlns">>, ?NS_VCARD_UPDATE}],
children = PhotoEl}.
export(LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:export(LServer).
import(LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:import(LServer).
import(LServer, DBType, LA) ->
Mod = gen_mod:db_mod(DBType, ?MODULE),
Mod:import(LServer, LA).
mod_opt_type(db_type) -> fun gen_mod:v_db/1;
mod_opt_type(_) -> [db_type].
