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

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%%%-------------------------------------------------------------------
%%% Author : Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% Created : 13 Sep 2017 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2024 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_avatar).
-behaviour(gen_mod).
-protocol({xep, 398, '0.2.0', '18.03', "complete", ""}).
%% gen_mod API
-export([start/2, stop/1, reload/3, depends/2, mod_opt_type/1, mod_options/1]).
-export([mod_doc/0]).
%% Hooks
-export([pubsub_publish_item/6, vcard_iq_convert/1, vcard_iq_publish/1,
get_sm_features/5]).
-include_lib("xmpp/include/xmpp.hrl").
-include("logger.hrl").
-include("pubsub.hrl").
-include("translate.hrl").
-type avatar_id_meta() :: #{avatar_meta => {binary(), avatar_meta()}}.
-opaque convert_rule() :: {default | eimp:img_type(), eimp:img_type()}.
-export_type([convert_rule/0]).
%%%===================================================================
%%% API
%%%===================================================================
start(_Host, _Opts) ->
{ok, [{hook, pubsub_publish_item, pubsub_publish_item, 50},
{hook, vcard_iq_set, vcard_iq_convert, 30},
{hook, vcard_iq_set, vcard_iq_publish, 100},
{hook, disco_sm_features, get_sm_features, 50}]}.
stop(_Host) ->
ok.
reload(_Host, _NewOpts, _OldOpts) ->
ok.
depends(_Host, _Opts) ->
[{mod_vcard, hard}, {mod_vcard_xupdate, hard}, {mod_pubsub, hard}].
%%%===================================================================
%%% Hooks
%%%===================================================================
-spec pubsub_publish_item(binary(), binary(), jid(), jid(), binary(), [xmlel()]) -> ok.
pubsub_publish_item(LServer, ?NS_AVATAR_METADATA,
#jid{luser = LUser, lserver = LServer} = From,
#jid{luser = LUser, lserver = LServer} = Host,
ItemId, [Payload|_]) ->
try xmpp:decode(Payload) of
#avatar_meta{info = []} ->
delete_vcard_avatar(From);
#avatar_meta{info = Info} ->
Rules = mod_avatar_opt:convert(LServer),
case get_meta_info(Info, Rules) of
#avatar_info{type = MimeType, id = ID, url = <<"">>} = I ->
case get_avatar_data(Host, ID) of
{ok, Data} ->
Meta = #avatar_meta{info = [I]},
Photo = #vcard_photo{type = MimeType,
binval = Data},
set_vcard_avatar(From, Photo,
#{avatar_meta => {ID, Meta}});
{error, _} ->
ok
end;
#avatar_info{type = MimeType, url = URL} ->
Photo = #vcard_photo{type = MimeType,
extval = URL},
set_vcard_avatar(From, Photo, #{})
end;
_ ->
?WARNING_MSG("Invalid avatar metadata of ~ts@~ts published "
"with item id ~ts",
[LUser, LServer, ItemId])
catch _:{xmpp_codec, Why} ->
?WARNING_MSG("Failed to decode avatar metadata of ~ts@~ts: ~ts",
[LUser, LServer, xmpp:format_error(Why)])
end;
pubsub_publish_item(_, _, _, _, _, _) ->
ok.
-spec vcard_iq_convert(iq()) -> iq() | {stop, stanza_error()}.
vcard_iq_convert(#iq{from = From, lang = Lang, sub_els = [VCard]} = IQ) ->
#jid{luser = LUser, lserver = LServer} = From,
case convert_avatar(LUser, LServer, VCard) of
{ok, MimeType, Data} ->
VCard1 = VCard#vcard_temp{
photo = #vcard_photo{type = MimeType,
binval = Data}},
IQ#iq{sub_els = [VCard1]};
pass ->
IQ;
{error, Reason} ->
stop_with_error(Lang, Reason)
end;
vcard_iq_convert(Acc) ->
Acc.
-spec vcard_iq_publish(iq()) -> iq() | {stop, stanza_error()}.
vcard_iq_publish(#iq{sub_els = [#vcard_temp{photo = undefined}]} = IQ) ->
publish_avatar(IQ, #avatar_meta{}, <<>>, <<>>, <<>>);
vcard_iq_publish(#iq{sub_els = [#vcard_temp{
photo = #vcard_photo{
type = MimeType,
binval = Data}}]} = IQ)
when is_binary(Data), Data /= <<>> ->
SHA1 = str:sha(Data),
M = get_avatar_meta(IQ),
case M of
{ok, SHA1, _} ->
IQ;
{ok, _ItemID, #avatar_meta{info = Info} = Meta} ->
case lists:keyfind(SHA1, #avatar_info.id, Info) of
#avatar_info{} ->
IQ;
false ->
Info1 = lists:filter(
fun(#avatar_info{url = URL}) -> URL /= <<"">> end,
Info),
Meta1 = Meta#avatar_meta{info = Info1},
publish_avatar(IQ, Meta1, MimeType, Data, SHA1)
end;
{error, _} ->
publish_avatar(IQ, #avatar_meta{}, MimeType, Data, SHA1)
end;
vcard_iq_publish(Acc) ->
Acc.
-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, <<"">>, _Lang) ->
{result, [?NS_PEP_VCARD_CONVERSION_0 |
case Acc of
{result, Features} -> Features;
empty -> []
end]};
get_sm_features(Acc, _From, _To, _Node, _Lang) ->
Acc.
%%%===================================================================
%%% Internal functions
%%%===================================================================
-spec get_meta_info([avatar_info()], [convert_rule()]) -> avatar_info().
get_meta_info(Info, Rules) ->
case lists:foldl(
fun(_, #avatar_info{} = Acc) ->
Acc;
(#avatar_info{url = URL}, Acc) when URL /= <<"">> ->
Acc;
(#avatar_info{} = I, _) when Rules == [] ->
I;
(#avatar_info{type = MimeType} = I, Acc) ->
T = decode_mime_type(MimeType),
case lists:keymember(T, 2, Rules) of
true ->
I;
false ->
case convert_to_type(T, Rules) of
undefined ->
Acc;
_ ->
[I|Acc]
end
end
end, [], Info) of
#avatar_info{} = I -> I;
[] -> hd(Info);
Is -> hd(lists:reverse(Is))
end.
-spec get_avatar_data(jid(), binary()) -> {ok, binary()} |
{error,
notfound | invalid_data | internal_error}.
get_avatar_data(JID, ItemID) ->
{LUser, LServer, _} = LBJID = jid:remove_resource(jid:tolower(JID)),
case mod_pubsub:get_item(LBJID, ?NS_AVATAR_DATA, ItemID) of
#pubsub_item{payload = [Payload|_]} ->
try xmpp:decode(Payload) of
#avatar_data{data = Data} ->
{ok, Data};
_ ->
?WARNING_MSG("Invalid avatar data detected "
"for ~ts@~ts with item id ~ts",
[LUser, LServer, ItemID]),
{error, invalid_data}
catch _:{xmpp_codec, Why} ->
?WARNING_MSG("Failed to decode avatar data for "
"~ts@~ts with item id ~ts: ~ts",
[LUser, LServer, ItemID,
xmpp:format_error(Why)]),
{error, invalid_data}
end;
#pubsub_item{payload = []} ->
?WARNING_MSG("Empty avatar data detected "
"for ~ts@~ts with item id ~ts",
[LUser, LServer, ItemID]),
{error, invalid_data};
{error, #stanza_error{reason = 'item-not-found'}} ->
{error, notfound};
{error, Reason} ->
?WARNING_MSG("Failed to get item for ~ts@~ts at node ~ts "
"with item id ~ts: ~p",
[LUser, LServer, ?NS_AVATAR_METADATA, ItemID, Reason]),
{error, internal_error}
end.
-spec get_avatar_meta(iq()) -> {ok, binary(), avatar_meta()} |
{error,
notfound | invalid_metadata | internal_error}.
get_avatar_meta(#iq{meta = #{avatar_meta := {ItemID, Meta}}}) ->
{ok, ItemID, Meta};
get_avatar_meta(#iq{from = JID}) ->
{LUser, LServer, _} = LBJID = jid:remove_resource(jid:tolower(JID)),
case mod_pubsub:get_items(LBJID, ?NS_AVATAR_METADATA) of
[#pubsub_item{itemid = {ItemID, _}, payload = [Payload|_]}|_] ->
try xmpp:decode(Payload) of
#avatar_meta{} = Meta ->
{ok, ItemID, Meta};
_ ->
?WARNING_MSG("Invalid metadata payload detected "
"for ~ts@~ts with item id ~ts",
[LUser, LServer, ItemID]),
{error, invalid_metadata}
catch _:{xmpp_codec, Why} ->
?WARNING_MSG("Failed to decode metadata for "
"~ts@~ts with item id ~ts: ~ts",
[LUser, LServer, ItemID,
xmpp:format_error(Why)]),
{error, invalid_metadata}
end;
{error, #stanza_error{reason = 'item-not-found'}} ->
{error, notfound};
{error, Reason} ->
?WARNING_MSG("Failed to get items for ~ts@~ts at node ~ts: ~p",
[LUser, LServer, ?NS_AVATAR_METADATA, Reason]),
{error, internal_error}
end.
-spec publish_avatar(iq(), avatar_meta(), binary(), binary(), binary()) ->
iq() | {stop, stanza_error()}.
publish_avatar(#iq{from = JID} = IQ, Meta, <<>>, <<>>, <<>>) ->
{_, LServer, _} = LBJID = jid:remove_resource(jid:tolower(JID)),
case mod_pubsub:publish_item(
LBJID, LServer, ?NS_AVATAR_METADATA,
JID, <<>>, [xmpp:encode(Meta)]) of
{result, _} ->
IQ;
{error, StanzaErr} ->
{stop, StanzaErr}
end;
publish_avatar(#iq{from = JID} = IQ, Meta, MimeType, Data, ItemID) ->
#avatar_meta{info = Info} = Meta,
{_, LServer, _} = LBJID = jid:remove_resource(jid:tolower(JID)),
Payload = xmpp:encode(#avatar_data{data = Data}),
case mod_pubsub:publish_item(
LBJID, LServer, ?NS_AVATAR_DATA,
JID, ItemID, [Payload]) of
{result, _} ->
{W, H} = case eimp:identify(Data) of
{ok, ImgInfo} ->
{proplists:get_value(width, ImgInfo),
proplists:get_value(height, ImgInfo)};
_ ->
{undefined, undefined}
end,
I = #avatar_info{id = ItemID,
width = W,
height = H,
type = MimeType,
bytes = size(Data)},
Meta1 = Meta#avatar_meta{info = [I|Info]},
case mod_pubsub:publish_item(
LBJID, LServer, ?NS_AVATAR_METADATA,
JID, ItemID, [xmpp:encode(Meta1)]) of
{result, _} ->
IQ;
{error, StanzaErr} ->
?ERROR_MSG("Failed to publish avatar metadata for ~ts: ~p",
[jid:encode(JID), StanzaErr]),
{stop, StanzaErr}
end;
{error, #stanza_error{reason = 'not-acceptable'} = StanzaErr} ->
?WARNING_MSG("Failed to publish avatar data for ~ts: ~p",
[jid:encode(JID), StanzaErr]),
{stop, StanzaErr};
{error, StanzaErr} ->
?ERROR_MSG("Failed to publish avatar data for ~ts: ~p",
[jid:encode(JID), StanzaErr]),
{stop, StanzaErr}
end.
-spec convert_avatar(binary(), binary(), vcard_temp()) ->
{ok, binary(), binary()} |
{error, eimp:error_reason() | base64_error} |
pass.
convert_avatar(LUser, LServer, VCard) ->
case mod_avatar_opt:convert(LServer) of
[] ->
pass;
Rules ->
case VCard#vcard_temp.photo of
#vcard_photo{binval = Data} when is_binary(Data) ->
convert_avatar(LUser, LServer, Data, Rules);
_ ->
pass
end
end.
-spec convert_avatar(binary(), binary(), binary(), [convert_rule()]) ->
{ok, binary(), binary()} |
{error, eimp:error_reason()} |
pass.
convert_avatar(LUser, LServer, Data, Rules) ->
Type = get_type(Data),
NewType = convert_to_type(Type, Rules),
if NewType == undefined ->
pass;
true ->
?DEBUG("Converting avatar of ~ts@~ts: ~ts -> ~ts",
[LUser, LServer, Type, NewType]),
RateLimit = mod_avatar_opt:rate_limit(LServer),
Opts = [{limit_by, {LUser, LServer}},
{rate_limit, RateLimit}],
case eimp:convert(Data, NewType, Opts) of
{ok, NewData} ->
{ok, encode_mime_type(NewType), NewData};
{error, Reason} = Err ->
?ERROR_MSG("Failed to convert avatar of "
"~ts@~ts (~ts -> ~ts): ~ts",
[LUser, LServer, Type, NewType,
eimp:format_error(Reason)]),
Err
end
end.
-spec set_vcard_avatar(jid(), vcard_photo() | undefined, avatar_id_meta()) -> ok.
set_vcard_avatar(JID, VCardPhoto, Meta) ->
case get_vcard(JID) of
{ok, #vcard_temp{photo = VCardPhoto}} ->
ok;
{ok, VCard} ->
VCard1 = VCard#vcard_temp{photo = VCardPhoto},
IQ = #iq{from = JID, to = JID, id = p1_rand:get_string(),
type = set, sub_els = [VCard1], meta = Meta},
LServer = JID#jid.lserver,
ejabberd_hooks:run_fold(vcard_iq_set, LServer, IQ, []),
ok;
{error, _} ->
ok
end.
-spec delete_vcard_avatar(jid()) -> ok.
delete_vcard_avatar(JID) ->
set_vcard_avatar(JID, undefined, #{}).
-spec get_vcard(jid()) -> {ok, vcard_temp()} | {error, invalid_vcard}.
get_vcard(#jid{luser = LUser, lserver = LServer}) ->
VCardEl = case mod_vcard:get_vcard(LUser, LServer) of
[El] -> El;
_ -> #vcard_temp{}
end,
try xmpp:decode(VCardEl, ?NS_VCARD, []) of
#vcard_temp{} = VCard ->
{ok, VCard};
_ ->
?ERROR_MSG("Invalid vCard of ~ts@~ts in the database",
[LUser, LServer]),
{error, invalid_vcard}
catch _:{xmpp_codec, Why} ->
?ERROR_MSG("Failed to decode vCard of ~ts@~ts: ~ts",
[LUser, LServer, xmpp:format_error(Why)]),
{error, invalid_vcard}
end.
-spec stop_with_error(binary(), eimp:error_reason()) ->
{stop, stanza_error()}.
stop_with_error(Lang, Reason) ->
Txt = eimp:format_error(Reason),
{stop, xmpp:err_internal_server_error(Txt, Lang)}.
-spec get_type(binary()) -> eimp:img_type() | unknown.
get_type(Data) ->
eimp:get_type(Data).
-spec convert_to_type(eimp:img_type() | unknown, [convert_rule()]) ->
eimp:img_type() | undefined.
convert_to_type(unknown, _Rules) ->
undefined;
convert_to_type(Type, Rules) ->
case proplists:get_value(Type, Rules) of
undefined ->
proplists:get_value(default, Rules);
Type ->
undefined;
T ->
T
end.
-spec decode_mime_type(binary()) -> eimp:img_type() | unknown.
decode_mime_type(MimeType) ->
case str:to_lower(MimeType) of
<<"image/jpeg">> -> jpeg;
<<"image/png">> -> png;
<<"image/webp">> -> webp;
<<"image/gif">> -> gif;
_ -> unknown
end.
-spec encode_mime_type(eimp:img_type()) -> binary().
encode_mime_type(Type) ->
<<"image/", (atom_to_binary(Type, latin1))/binary>>.
mod_opt_type(convert) ->
case eimp:supported_formats() of
[] ->
fun(_) -> econf:fail(eimp_error) end;
Formats ->
econf:options(
maps:from_list(
[{Type, econf:enum(Formats)}
|| Type <- [default|Formats]]))
end;
mod_opt_type(rate_limit) ->
econf:pos_int().
-spec mod_options(binary()) -> [{convert, [?MODULE:convert_rule()]} |
{atom(), any()}].
mod_options(_) ->
[{rate_limit, 10},
{convert, []}].
mod_doc() ->
#{desc =>
[?T("The purpose of the module is to cope with legacy and modern "
"XMPP clients posting avatars. The process is described in "
"https://xmpp.org/extensions/xep-0398.html"
"[XEP-0398: User Avatar to vCard-Based Avatars Conversion]."), "",
?T("Also, the module supports conversion between avatar "
"image formats on the fly."), "",
?T("The module depends on _`mod_vcard`_, _`mod_vcard_xupdate`_ and "
"_`mod_pubsub`_.")],
opts =>
[{convert,
#{value => "{From: To}",
desc =>
?T("Defines image conversion rules: the format in 'From' "
"will be converted to format in 'To'. The value of 'From' "
"can also be 'default', which is match-all rule. NOTE: "
"the list of supported formats is detected at compile time "
"depending on the image libraries installed in the system."),
example =>
["convert:",
" webp: jpg",
" default: png"]}},
{rate_limit,
#{value => ?T("Number"),
desc =>
?T("Limit any given JID by the number of avatars it is able "
"to convert per minute. This is to protect the server from "
"image conversion DoS. The default value is '10'.")}}]}.
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