mirror of
https://github.com/processone/ejabberd.git
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265 lines
7.7 KiB
Erlang
265 lines
7.7 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : mod_private.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : Support for private storage.
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%%% Created : 16 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2009 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License
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%%% along with this program; if not, write to the Free Software
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%%----------------------------------------------------------------------
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-module(mod_private).
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-author('alexey@process-one.net').
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-behaviour(gen_mod).
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-export([start/2,
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stop/1,
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process_sm_iq/3,
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remove_user/2]).
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-include_lib("exmpp/include/exmpp.hrl").
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-include("ejabberd.hrl").
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-record(private_storage, {usns, xml}).
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start(Host, Opts) ->
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HostB = list_to_binary(Host),
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IQDisc = gen_mod:get_opt(iqdisc, Opts, one_queue),
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mnesia:create_table(private_storage,
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[{disc_only_copies, [node()]},
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{attributes, record_info(fields, private_storage)}]),
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update_table(),
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ejabberd_hooks:add(remove_user, HostB,
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?MODULE, remove_user, 50),
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gen_iq_handler:add_iq_handler(ejabberd_sm, HostB, ?NS_PRIVATE,
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?MODULE, process_sm_iq, IQDisc).
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stop(Host) ->
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HostB = list_to_binary(Host),
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ejabberd_hooks:delete(remove_user, HostB,
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?MODULE, remove_user, 50),
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gen_iq_handler:remove_iq_handler(ejabberd_sm, HostB, ?NS_PRIVATE).
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process_sm_iq(From, To, #iq{type = Type} = IQ_Rec) ->
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case check_packet(From, To, IQ_Rec) of
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ok ->
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case Type of
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set ->
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process_iq_set(From, To, IQ_Rec);
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get ->
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process_iq_get(From, To, IQ_Rec)
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end;
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{error, Error} ->
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exmpp_iq:error(IQ_Rec, Error)
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end.
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process_iq_get(From, _To, #iq{payload = SubEl} = IQ_Rec) ->
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LUser = exmpp_jid:prep_node(From),
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LServer = exmpp_jid:prep_domain(From),
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case catch get_data(LUser,
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LServer,
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exmpp_xml:get_child_elements(SubEl)) of
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{'EXIT', _Reason} ->
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{error, 'internal-server-error'};
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Res ->
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exmpp_iq:result(IQ_Rec, #xmlel{ns = ?NS_PRIVATE,
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name = 'query',
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children = Res})
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end.
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process_iq_set(From, _To, #iq{payload = SubEl} = IQ_Rec) ->
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LUser = exmpp_jid:prep_node(From),
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LServer = exmpp_jid:prep_domain(From),
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F = fun() ->
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lists:foreach(
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fun(El) ->
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set_data(LUser, LServer, El)
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end, exmpp_xml:get_child_elements(SubEl))
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end,
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mnesia:transaction(F),
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exmpp_iq:result(IQ_Rec).
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check_packet(From, To, IQ_Rec) ->
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check_packet(From, To, IQ_Rec, [ fun check_domain/3,
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fun check_user/3,
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fun check_ns/3]).
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check_packet(_From, _To, _IQ_Rec, []) ->
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ok;
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check_packet(From, To, IQ_Rec, [F | R]) ->
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case F(From, To, IQ_Rec) of
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{error, _} = Error -> Error;
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ok -> check_packet(From, To, IQ_Rec, R)
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end.
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check_domain(From, _To, _IQ_Rec) ->
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LServer = exmpp_jid:prep_domain_as_list(From),
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case lists:member(LServer, ?MYHOSTS) of
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true -> ok;
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false -> {error, 'not-allowed'}
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end.
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% the iq can't be directed to another jid
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check_user(From, To, _IQ_Rec) ->
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case exmpp_jid:bare_compare(From, To) of
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true -> ok;
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false -> {error, 'forbidden'}
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end.
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%there must be at least one child, and every child should have
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%a namespace specified (reject if the namespace is jabber:iq:private,
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%the same than the parent element).
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check_ns(_From, _To, #iq{payload = SubEl}) ->
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case exmpp_xml:get_child_elements(SubEl) of
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[] ->
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{error, 'not-acceptable'};
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Children ->
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case lists:any(fun(Child) ->
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exmpp_xml:get_ns_as_atom(Child) =:= ?NS_PRIVATE
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end, Children) of
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true -> {error, 'not-acceptable'};
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false -> ok
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end
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end.
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set_data(LUser, LServer, El) ->
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XMLNS = exmpp_xml:get_ns_as_atom(El),
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mnesia:write(#private_storage{usns = {LUser, LServer, XMLNS},
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xml = El}).
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get_data(LUser, LServer, Els) ->
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get_data(LUser, LServer, Els, []).
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get_data(_LUser, _LServer, [], Res) ->
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lists:reverse(Res);
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get_data(LUser, LServer, [El | Els], Res) ->
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XMLNS = exmpp_xml:get_ns_as_atom(El),
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case mnesia:dirty_read(private_storage, {LUser, LServer, XMLNS}) of
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[R] ->
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get_data(LUser, LServer, Els,
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[R#private_storage.xml | Res]);
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[] ->
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get_data(LUser, LServer, Els,
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[El | Res])
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end.
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remove_user(User, Server)
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when is_binary(User), is_binary(Server) ->
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try
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LUser = exmpp_stringprep:nodeprep(User),
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LServer = exmpp_stringprep:nameprep(Server),
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F = fun() ->
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Namespaces = mnesia:select(
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private_storage,
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[{#private_storage{usns = {LUser, LServer, '$1'},
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_ = '_'},
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[],
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['$$']}]),
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lists:foreach(
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fun([Namespace]) ->
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mnesia:delete({private_storage,
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{LUser, LServer, Namespace}})
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end, Namespaces)
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end,
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mnesia:transaction(F)
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catch
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_ ->
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ok
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end.
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update_table() ->
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Fields = record_info(fields, private_storage),
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case mnesia:table_info(private_storage, attributes) of
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Fields ->
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convert_to_exmpp();
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[userns, xml] ->
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?INFO_MSG("Converting private_storage table from "
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"{user, default, lists} format", []),
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Host = ?MYNAME,
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{atomic, ok} = mnesia:create_table(
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mod_private_tmp_table,
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[{disc_only_copies, [node()]},
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{type, bag},
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{local_content, true},
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{record_name, private_storage},
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{attributes, record_info(fields, private_storage)}]),
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mnesia:transform_table(private_storage, ignore, Fields),
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F1 = fun() ->
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mnesia:write_lock_table(mod_private_tmp_table),
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mnesia:foldl(
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fun(#private_storage{usns = {U, NS}, xml = El} = R, _) ->
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NS1 = list_to_atom(NS),
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El0 = exmpp_xml:xmlelement_to_xmlel(El,
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[?NS_PRIVATE], [{?NS_XMPP, ?NS_XMPP_pfx}]),
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El1 = exmpp_xml:remove_whitespaces_deeply(El0),
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mnesia:dirty_write(
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mod_private_tmp_table,
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R#private_storage{usns = {U, Host, NS1}, xml = El1})
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end, ok, private_storage)
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end,
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mnesia:transaction(F1),
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mnesia:clear_table(private_storage),
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F2 = fun() ->
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mnesia:write_lock_table(private_storage),
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mnesia:foldl(
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fun(R, _) ->
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mnesia:dirty_write(R)
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end, ok, mod_private_tmp_table)
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end,
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mnesia:transaction(F2),
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mnesia:delete_table(mod_private_tmp_table);
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_ ->
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?INFO_MSG("Recreating private_storage table", []),
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mnesia:transform_table(private_storage, ignore, Fields)
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end.
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convert_to_exmpp() ->
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Fun = fun() ->
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case mnesia:first(private_storage) of
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'$end_of_table' ->
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none;
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{U, _S, _NS} when is_binary(U) ->
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none;
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{U, _S, _NS} when is_list(U) ->
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mnesia:foldl(fun convert_to_exmpp2/2,
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done, private_storage, write)
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end
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end,
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mnesia:transaction(Fun).
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convert_to_exmpp2(#private_storage{usns = {U, S, NS} = Key, xml = El} = R,
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Acc) ->
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mnesia:delete({private_storage, Key}),
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U1 = list_to_binary(U),
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S1 = list_to_binary(S),
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NS1 = list_to_atom(NS),
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El1 = exmpp_xml:xmlelement_to_xmlel(El,
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[?NS_PRIVATE], [{?NS_XMPP, ?NS_XMPP_pfx}]),
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New_R = R#private_storage{
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usns = {U1, S1, NS1},
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xml = El1},
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mnesia:write(New_R),
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Acc.
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