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

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%%%----------------------------------------------------------------------
%%% File : ejabberd_piefxis.erl
%%% Author : Pablo Polvorin, Vidal Santiago Martinez, Evgeniy Khramtsov
%%% Purpose : XEP-0227: Portable Import/Export Format for XMPP-IM Servers
%%% Created : 17 Jul 2008 by Pablo Polvorin <pablo.polvorin@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2020 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.
%%%
%%%----------------------------------------------------------------------
%%% Not implemented:
%%% - write mod_piefxis with ejabberdctl commands
%%% - Export from mod_offline_sql.erl
%%% - Export from mod_private_sql.erl
%%% - XEP-227: 6. Security Considerations
%%% - Other schemas of XInclude are not tested, and may not be imported correctly.
%%% - If a host has many users, split that host in XML files with 50 users each.
%%%% Headers
-module(ejabberd_piefxis).
-protocol({xep, 227, '1.0'}).
-export([import_file/1, export_server/1, export_host/2]).
-define(CHUNK_SIZE, 1024*20). %20k
-include("scram.hrl").
-include("logger.hrl").
-include("xmpp.hrl").
-include("mod_privacy.hrl").
-include("mod_roster.hrl").
%%-include_lib("exmpp/include/exmpp.hrl").
%%-include_lib("exmpp/include/exmpp_client.hrl").
%% Copied from exmpp header files:
%% Copied from mod_private.erl
%%-define(ERROR_MSG(M,Args),io:format(M,Args)).
%%-define(INFO_MSG(M,Args),ok).
%%%==================================
%%%% Import file
-define(NS_PIE, <<"urn:xmpp:pie:0">>).
-define(NS_PIEFXIS, <<"http://www.xmpp.org/extensions/xep-0227.html#ns">>).
-define(NS_XI, <<"http://www.w3.org/2001/XInclude">>).
-record(state, {xml_stream_state :: fxml_stream:xml_stream_state() | undefined,
user = <<"">> :: binary(),
server = <<"">> :: binary(),
fd = self() :: file:io_device(),
dir = <<"">> :: binary()}).
-type state() :: #state{}.
%%File could be large.. we read it in chunks
%%%===================================================================
%%% API
%%%===================================================================
import_file(FileName) ->
import_file(FileName, #state{}).
-spec import_file(binary(), state()) -> ok | {error, atom()}.
import_file(FileName, State) ->
case file:open(FileName, [read, binary]) of
{ok, Fd} ->
Dir = filename:dirname(FileName),
XMLStreamState = fxml_stream:new(self(), infinity),
Res = process(State#state{xml_stream_state = XMLStreamState,
fd = Fd,
dir = Dir}),
file:close(Fd),
Res;
{error, Reason} ->
ErrTxt = file:format_error(Reason),
?ERROR_MSG("Failed to open file '~ts': ~ts", [FileName, ErrTxt]),
{error, Reason}
end.
-spec export_server(binary()) -> any().
export_server(Dir) ->
export_hosts(ejabberd_option:hosts(), Dir).
-spec export_host(binary(), binary()) -> any().
export_host(Dir, Host) ->
export_hosts([Host], Dir).
%%%===================================================================
%%% Internal functions
%%%===================================================================
export_hosts(Hosts, Dir) ->
FnT = make_filename_template(),
DFn = make_main_basefilename(Dir, FnT),
case file:open(DFn, [raw, write]) of
{ok, Fd} ->
print(Fd, make_piefxis_xml_head()),
print(Fd, make_piefxis_server_head()),
FilesAndHosts = [{make_host_filename(FnT, Host), Host}
|| Host <- Hosts],
lists:foreach(
fun({FnH, _}) ->
print(Fd, make_xinclude(FnH))
end, FilesAndHosts),
print(Fd, make_piefxis_server_tail()),
print(Fd, make_piefxis_xml_tail()),
file:close(Fd),
lists:foldl(
fun({FnH, Host}, ok) ->
export_host(Dir, FnH, Host);
(_, Err) ->
Err
end, ok, FilesAndHosts);
{error, Reason} ->
ErrTxt = file:format_error(Reason),
?ERROR_MSG("Failed to open file '~ts': ~ts", [DFn, ErrTxt]),
{error, Reason}
end.
export_host(Dir, FnH, Host) ->
DFn = make_host_basefilename(Dir, FnH),
case file:open(DFn, [raw, write]) of
{ok, Fd} ->
print(Fd, make_piefxis_xml_head()),
print(Fd, make_piefxis_host_head(Host)),
Users = ejabberd_auth:get_users(Host),
case export_users(Users, Host, Fd) of
ok ->
print(Fd, make_piefxis_host_tail()),
print(Fd, make_piefxis_xml_tail()),
file:close(Fd),
ok;
Err ->
file:close(Fd),
file:delete(DFn),
Err
end;
{error, Reason} ->
ErrTxt = file:format_error(Reason),
?ERROR_MSG("Failed to open file '~ts': ~ts", [DFn, ErrTxt]),
{error, Reason}
end.
export_users([{User, _S}|Users], Server, Fd) ->
case export_user(User, Server, Fd) of
ok ->
export_users(Users, Server, Fd);
Err ->
Err
end;
export_users([], _Server, _Fd) ->
ok.
export_user(User, Server, Fd) ->
Password = ejabberd_auth:get_password_s(User, Server),
LServer = jid:nameprep(Server),
Pass = case ejabberd_auth:password_format(LServer) of
scram -> format_scram_password(Password);
_ -> Password
end,
Els = get_offline(User, Server) ++
get_vcard(User, Server) ++
get_privacy(User, Server) ++
get_roster(User, Server) ++
get_private(User, Server),
print(Fd, fxml:element_to_binary(
#xmlel{name = <<"user">>,
attrs = [{<<"name">>, User},
{<<"password">>, Pass}],
children = Els})).
format_scram_password(#scram{storedkey = StoredKey, serverkey = ServerKey,
salt = Salt, iterationcount = IterationCount}) ->
StoredKeyB64 = base64:encode(StoredKey),
ServerKeyB64 = base64:encode(ServerKey),
SaltB64 = base64:encode(Salt),
IterationCountBin = (integer_to_binary(IterationCount)),
<<"scram:", StoredKeyB64/binary, ",", ServerKeyB64/binary, ",", SaltB64/binary, ",", IterationCountBin/binary>>.
parse_scram_password(PassData) ->
Split = binary:split(PassData, <<",">>, [global]),
[StoredKeyB64, ServerKeyB64, SaltB64, IterationCountBin] = Split,
#scram{
storedkey = base64:decode(StoredKeyB64),
serverkey = base64:decode(ServerKeyB64),
salt = base64:decode(SaltB64),
iterationcount = (binary_to_integer(IterationCountBin))
}.
-spec get_vcard(binary(), binary()) -> [xmlel()].
get_vcard(User, Server) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
case mod_vcard:get_vcard(LUser, LServer) of
error -> [];
Els -> Els
end.
-spec get_offline(binary(), binary()) -> [xmlel()].
get_offline(User, Server) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
case mod_offline:get_offline_els(LUser, LServer) of
[] ->
[];
Els ->
NewEls = lists:map(fun xmpp:encode/1, Els),
[#xmlel{name = <<"offline-messages">>, children = NewEls}]
end.
-spec get_privacy(binary(), binary()) -> [xmlel()].
get_privacy(User, Server) ->
case mod_privacy:get_user_lists(User, Server) of
{ok, #privacy{default = Default,
lists = [_|_] = Lists}} ->
XLists = lists:map(
fun({Name, Items}) ->
XItems = lists:map(
fun mod_privacy:encode_list_item/1,
Items),
#privacy_list{name = Name, items = XItems}
end, Lists),
[xmpp:encode(#privacy_query{default = Default, lists = XLists})];
_ ->
[]
end.
-spec get_roster(binary(), binary()) -> [xmlel()].
get_roster(User, Server) ->
JID = jid:make(User, Server),
case mod_roster:get_roster(User, Server) of
[_|_] = Items ->
Subs =
lists:flatmap(
fun(#roster{ask = Ask,
askmessage = Msg} = R)
when Ask == in; Ask == both ->
Status = if is_binary(Msg) -> (Msg);
true -> <<"">>
end,
[xmpp:encode(
#presence{from = jid:make(R#roster.jid),
to = JID,
type = subscribe,
status = xmpp:mk_text(Status)})];
(_) ->
[]
end, Items),
Rs = lists:flatmap(
fun(#roster{ask = in, subscription = none}) ->
[];
(R) ->
[mod_roster:encode_item(R)]
end, Items),
[xmpp:encode(#roster_query{items = Rs}) | Subs];
_ ->
[]
end.
-spec get_private(binary(), binary()) -> [xmlel()].
get_private(User, Server) ->
case mod_private:get_data(User, Server) of
[_|_] = Els ->
[xmpp:encode(#private{sub_els = Els})];
_ ->
[]
end.
process(#state{xml_stream_state = XMLStreamState, fd = Fd} = State) ->
case file:read(Fd, ?CHUNK_SIZE) of
{ok, Data} ->
NewXMLStreamState = fxml_stream:parse(XMLStreamState, Data),
case process_els(State#state{xml_stream_state =
NewXMLStreamState}) of
{ok, NewState} ->
process(NewState);
Err ->
fxml_stream:close(NewXMLStreamState),
Err
end;
eof ->
fxml_stream:close(XMLStreamState),
ok
end.
process_els(State) ->
Els = gather_els(State, []),
process_els(State, lists:reverse(Els)).
gather_els(State, List) ->
receive
{'$gen_event', El} ->
gather_els(State, [El | List])
after 0 ->
List
end.
process_els(State, [El | Tail]) ->
case process_el(El, State) of
{ok, NewState} ->
process_els(NewState, Tail);
Err ->
Err
end;
process_els(State, []) ->
{ok, State}.
process_el({xmlstreamstart, <<"server-data">>, Attrs}, State) ->
case fxml:get_attr_s(<<"xmlns">>, Attrs) of
?NS_PIEFXIS ->
{ok, State};
?NS_PIE ->
{ok, State};
NS ->
stop("Unknown 'server-data' namespace = ~ts", [NS])
end;
process_el({xmlstreamend, _}, State) ->
{ok, State};
process_el({xmlstreamcdata, _}, State) ->
{ok, State};
process_el({xmlstreamelement, #xmlel{name = <<"xi:include">>,
attrs = Attrs}},
#state{dir = Dir, user = <<"">>} = State) ->
FileName = fxml:get_attr_s(<<"href">>, Attrs),
case import_file(filename:join([Dir, FileName]), State) of
ok ->
{ok, State};
Err ->
Err
end;
process_el({xmlstreamstart, <<"host">>, Attrs}, State) ->
process_el({xmlstreamelement, #xmlel{name = <<"host">>,
attrs = Attrs}}, State);
process_el({xmlstreamelement, #xmlel{name = <<"host">>,
attrs = Attrs,
children = Els}}, State) ->
JIDS = fxml:get_attr_s(<<"jid">>, Attrs),
try jid:decode(JIDS) of
#jid{lserver = S} ->
case ejabberd_router:is_my_host(S) of
true ->
process_users(Els, State#state{server = S});
false ->
stop("Unknown host: ~ts", [S])
end
catch _:{bad_jid, _} ->
stop("Invalid 'jid': ~ts", [JIDS])
end;
process_el({xmlstreamstart, <<"user">>, Attrs}, State = #state{server = S})
when S /= <<"">> ->
process_el({xmlstreamelement, #xmlel{name = <<"user">>, attrs = Attrs}},
State);
process_el({xmlstreamelement, #xmlel{name = <<"user">>} = El},
State = #state{server = S}) when S /= <<"">> ->
process_user(El, State);
process_el({xmlstreamelement, El}, State = #state{server = S, user = U})
when S /= <<"">>, U /= <<"">> ->
process_user_el(El, State);
process_el({xmlstreamelement, El}, _State) ->
stop("Unexpected tag: ~p", [El]);
process_el({xmlstreamstart, El, Attrs}, _State) ->
stop("Unexpected payload: ~p", [{El, Attrs}]);
process_el({xmlstreamerror, Err}, _State) ->
stop("Failed to process element = ~p", [Err]).
process_users([#xmlel{} = El|Els], State) ->
case process_user(El, State) of
{ok, NewState} ->
process_users(Els, NewState);
Err ->
Err
end;
process_users([_|Els], State) ->
process_users(Els, State);
process_users([], State) ->
{ok, State}.
process_user(#xmlel{name = <<"user">>, attrs = Attrs, children = Els},
#state{server = LServer} = State) ->
Name = fxml:get_attr_s(<<"name">>, Attrs),
Password = fxml:get_attr_s(<<"password">>, Attrs),
PasswordFormat = ejabberd_auth:password_format(LServer),
Pass = case PasswordFormat of
scram ->
case Password of
<<"scram:", PassData/binary>> ->
parse_scram_password(PassData);
P -> P
end;
_ -> Password
end,
case jid:nodeprep(Name) of
error ->
stop("Invalid 'user': ~ts", [Name]);
LUser ->
case ejabberd_auth:try_register(LUser, LServer, Pass) of
ok ->
process_user_els(Els, State#state{user = LUser});
{error, invalid_password} when (Password == <<>>) ->
process_user_els(Els, State#state{user = LUser});
{error, Err} ->
stop("Failed to create user '~ts': ~p", [Name, Err])
end
end.
process_user_els([#xmlel{} = El|Els], State) ->
case process_user_el(El, State) of
{ok, NewState} ->
process_user_els(Els, NewState);
Err ->
Err
end;
process_user_els([_|Els], State) ->
process_user_els(Els, State);
process_user_els([], State) ->
{ok, State}.
process_user_el(#xmlel{name = Name, attrs = Attrs, children = Els} = El,
State) ->
try
case {Name, fxml:get_attr_s(<<"xmlns">>, Attrs)} of
{<<"query">>, ?NS_ROSTER} ->
process_roster(xmpp:decode(El), State);
{<<"query">>, ?NS_PRIVACY} ->
%% Make sure <list/> elements go before <active/> and <default/>
process_privacy(xmpp:decode(El), State);
{<<"query">>, ?NS_PRIVATE} ->
process_private(xmpp:decode(El), State);
{<<"vCard">>, ?NS_VCARD} ->
process_vcard(xmpp:decode(El), State);
{<<"offline-messages">>, NS} ->
Msgs = [xmpp:decode(E, NS, [ignore_els]) || E <- Els],
process_offline_msgs(Msgs, State);
{<<"presence">>, ?NS_CLIENT} ->
process_presence(xmpp:decode(El, ?NS_CLIENT, [ignore_els]), State);
_ ->
{ok, State}
end
catch _:{xmpp_codec, Why} ->
ErrTxt = xmpp:format_error(Why),
stop("failed to decode XML '~ts': ~ts",
[fxml:element_to_binary(El), ErrTxt])
end.
-spec process_offline_msgs([stanza()], state()) -> {ok, state()} | {error, _}.
process_offline_msgs([#message{} = Msg|Msgs], State) ->
case process_offline_msg(Msg, State) of
{ok, NewState} ->
process_offline_msgs(Msgs, NewState);
Err ->
Err
end;
process_offline_msgs([_|Msgs], State) ->
process_offline_msgs(Msgs, State);
process_offline_msgs([], State) ->
{ok, State}.
-spec process_roster(roster_query(), state()) -> {ok, state()} | {error, _}.
process_roster(RosterQuery, State = #state{user = U, server = S}) ->
case mod_roster:set_items(U, S, RosterQuery) of
{atomic, _} ->
{ok, State};
Err ->
stop("Failed to write roster: ~p", [Err])
end.
-spec process_privacy(privacy_query(), state()) -> {ok, state()} | {error, _}.
process_privacy(#privacy_query{lists = Lists,
default = Default,
active = Active},
State = #state{user = U, server = S}) ->
JID = jid:make(U, S),
if Lists /= undefined ->
process_privacy2(JID, #privacy_query{lists = Lists});
true ->
ok
end,
if Active /= undefined ->
process_privacy2(JID, #privacy_query{active = Active});
true ->
ok
end,
if Default /= undefined ->
process_privacy2(JID, #privacy_query{default = Default});
true ->
ok
end,
{ok, State}.
process_privacy2(JID, PQ) ->
case mod_privacy:process_iq(#iq{type = set, id = p1_rand:get_string(),
from = JID, to = JID,
sub_els = [PQ]}) of
#iq{type = error} = ResIQ ->
#stanza_error{reason = Reason} = xmpp:get_error(ResIQ),
if Reason /= 'item-not-found' ->
%% Failed to set default list because there is no
%% list with such name. We shouldn't stop here.
stop("Failed to write default privacy: ~p", [Reason]);
true ->
ok
end;
_ ->
ok
end.
-spec process_private(private(), state()) -> {ok, state()} | {error, _}.
process_private(Private, State = #state{user = U, server = S}) ->
JID = jid:make(U, S),
IQ = #iq{type = set, id = p1_rand:get_string(),
from = JID, to = JID, sub_els = [Private]},
case mod_private:process_sm_iq(IQ) of
#iq{type = result} ->
{ok, State};
Err ->
stop("Failed to write private: ~p", [Err])
end.
-spec process_vcard(xmpp_element(), state()) -> {ok, state()} | {error, _}.
process_vcard(El, State = #state{user = U, server = S}) ->
JID = jid:make(U, S),
IQ = #iq{type = set, id = p1_rand:get_string(),
from = JID, to = JID, sub_els = [El]},
case mod_vcard:process_sm_iq(IQ) of
#iq{type = result} ->
{ok, State};
Err ->
stop("Failed to write vcard: ~p", [Err])
end.
-spec process_offline_msg(message(), state()) -> {ok, state()} | {error, _}.
process_offline_msg(#message{from = undefined}, _State) ->
stop("No 'from' attribute found", []);
process_offline_msg(Msg, State = #state{user = U, server = S}) ->
To = jid:make(U, S),
ejabberd_hooks:run_fold(
offline_message_hook, To#jid.lserver, {pass, xmpp:set_to(Msg, To)}, []),
{ok, State}.
-spec process_presence(presence(), state()) -> {ok, state()} | {error, _}.
process_presence(#presence{from = undefined}, _State) ->
stop("No 'from' attribute found", []);
process_presence(Pres, #state{user = U, server = S} = State) ->
To = jid:make(U, S),
NewPres = xmpp:set_to(Pres, To),
ejabberd_router:route(NewPres),
{ok, State}.
stop(Fmt, Args) ->
?ERROR_MSG(Fmt, Args),
{error, import_failed}.
make_filename_template() ->
{{Year, Month, Day}, {Hour, Minute, Second}} = calendar:local_time(),
str:format("~4..0w~2..0w~2..0w-~2..0w~2..0w~2..0w",
[Year, Month, Day, Hour, Minute, Second]).
make_main_basefilename(Dir, FnT) ->
Filename2 = <<FnT/binary, ".xml">>,
filename:join([Dir, Filename2]).
%% @doc Make the filename for the host.
%% Example: ``(<<"20080804-231550">>, <<"jabber.example.org">>) ->
%% <<"20080804-231550_jabber_example_org.xml">>''
make_host_filename(FnT, Host) ->
Host2 = str:join(str:tokens(Host, <<".">>), <<"_">>),
<<FnT/binary, "_", Host2/binary, ".xml">>.
%%%==================================
%%%% PIEFXIS formatting
make_host_basefilename(Dir, FnT) ->
filename:join([Dir, FnT]).
%% @spec () -> string()
make_piefxis_xml_head() ->
"<?xml version='1.0' encoding='UTF-8'?>".
%% @spec () -> string()
make_piefxis_xml_tail() ->
"".
%% @spec () -> string()
make_piefxis_server_head() ->
io_lib:format("<server-data xmlns='~ts' xmlns:xi='~ts'>",
[?NS_PIE, ?NS_XI]).
%% @spec () -> string()
make_piefxis_server_tail() ->
"</server-data>".
%% @spec (Host::string()) -> string()
make_piefxis_host_head(Host) ->
io_lib:format("<host xmlns='~ts' xmlns:xi='~ts' jid='~ts'>",
[?NS_PIE, ?NS_XI, Host]).
%% @spec () -> string()
make_piefxis_host_tail() ->
"</host>".
%% @spec (Fn::string()) -> string()
make_xinclude(Fn) ->
Base = filename:basename(Fn),
io_lib:format("<xi:include href='~ts'/>", [Base]).
print(Fd, String) ->
file:write(Fd, String).
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