%%%----------------------------------------------------------------------
%%% File    : jd2ejd.erl
%%% Author  : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Import of jabberd14 user spool file
%%% Created :  2 Feb 2003 by Alexey Shchepin <alexey@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.
%%%
%%%----------------------------------------------------------------------

-module(jd2ejd).

-author('alexey@process-one.net').

%% External exports
-export([import_file/1, import_dir/1]).

-include("logger.hrl").
-include_lib("xmpp/include/xmpp.hrl").

%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------

import_file(File) ->
    User = filename:rootname(filename:basename(File)),
    Server = filename:basename(filename:dirname(File)),
    case jid:nodeprep(User) /= error andalso
	   jid:nameprep(Server) /= error
	of
      true ->
	  case file:read_file(File) of
	    {ok, Text} ->
		case fxml_stream:parse_element(Text) of
		  El when is_record(El, xmlel) ->
		      case catch process_xdb(User, Server, El) of
			{'EXIT', Reason} ->
			    ?ERROR_MSG("Error while processing file \"~ts\": "
				       "~p~n",
				       [File, Reason]),
			    {error, Reason};
			_ -> ok
		      end;
		  {error, Reason} ->
		      ?ERROR_MSG("Can't parse file \"~ts\": ~p~n",
				 [File, Reason]),
		      {error, Reason}
		end;
	    {error, Reason} ->
		?ERROR_MSG("Can't read file \"~ts\": ~p~n",
			   [File, Reason]),
		{error, Reason}
	  end;
      false ->
	  ?ERROR_MSG("Illegal user/server name in file \"~ts\"~n",
		     [File]),
	  {error, <<"illegal user/server">>}
    end.

import_dir(Dir) ->
    {ok, Files} = file:list_dir(Dir),
    MsgFiles = lists:filter(fun (FN) ->
				    case length(FN) > 4 of
				      true ->
					  string:substr(FN, length(FN) - 3) ==
					    ".xml";
				      _ -> false
				    end
			    end,
			    Files),
    lists:foldl(fun (FN, A) ->
			Res = import_file(filename:join([Dir, FN])),
			case {A, Res} of
			  {ok, ok} -> ok;
			  {ok, _} ->
			      {error, <<"see ejabberd log for details">>};
			  _ -> A
			end
		end,
		ok, MsgFiles).

%%%----------------------------------------------------------------------
%%% Internal functions
%%%----------------------------------------------------------------------

process_xdb(User, Server,
	    #xmlel{name = Name, children = Els}) ->
    case Name of
      <<"xdb">> ->
	  lists:foreach(fun (El) -> xdb_data(User, Server, El)
			end,
			Els);
      _ -> ok
    end.

xdb_data(_User, _Server, {xmlcdata, _CData}) -> ok;
xdb_data(User, Server, #xmlel{attrs = Attrs} = El) ->
    From = jid:make(User, Server),
    LServer = From#jid.lserver,
    case fxml:get_attr_s(<<"xmlns">>, Attrs) of
      ?NS_AUTH ->
	  Password = fxml:get_tag_cdata(El),
	  ejabberd_auth:set_password(User, Server, Password),
	  ok;
      ?NS_ROSTER ->
	  catch mod_roster:set_items(User, Server, xmpp:decode(El)),
	  ok;
      ?NS_LAST ->
	  TimeStamp = fxml:get_attr_s(<<"last">>, Attrs),
	  Status = fxml:get_tag_cdata(El),
	  catch mod_last:store_last_info(User, Server,
					 binary_to_integer(TimeStamp),
					 Status),
	  ok;
      ?NS_VCARD ->
	  catch mod_vcard:set_vcard(User, LServer, El),
	  ok;
      <<"jabber:x:offline">> ->
	  process_offline(Server, From, El), ok;
      XMLNS ->
	  case fxml:get_attr_s(<<"j_private_flag">>, Attrs) of
	    <<"1">> ->
		NewAttrs = lists:filter(
			     fun({<<"j_private_flag">>, _}) -> false;
				({<<"xdbns">>, _}) -> false;
				(_) -> true
			     end, Attrs),
		catch mod_private:set_data(
			From,
			[{XMLNS, El#xmlel{attrs = NewAttrs}}]);
	    _ ->
		?DEBUG("Unknown namespace \"~ts\"~n", [XMLNS])
	  end,
	  ok
    end.

process_offline(Server, To, #xmlel{children = Els}) ->
    LServer = jid:nameprep(Server),
    lists:foreach(
      fun(#xmlel{} = El) ->
	      try xmpp:decode(El, ?NS_CLIENT, [ignore_els]) of
		  #message{from = JID} = Msg ->
		      From = case JID of
				 undefined -> jid:make(Server);
				 _ -> JID
			     end,
		      ejabberd_hooks:run_fold(
			offline_message_hook,
			LServer, {pass, xmpp:set_from_to(Msg, From, To)}, []);
		  _ ->
		      ok
	      catch _:{xmpp_codec, Why} ->
		      Txt = xmpp:format_error(Why),
		      ?ERROR_MSG("Failed to decode XML '~ts': ~ts",
				 [fxml:element_to_binary(El), Txt])
	      end
      end, Els).