294 lines
8.7 KiB
Erlang
294 lines
8.7 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : translate.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : Localization helper
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%%% Created : 6 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2017 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 along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%----------------------------------------------------------------------
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-module(translate).
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-author('alexey@process-one.net').
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-behaviour(gen_server).
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-export([start_link/0, reload/0, translate/2]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
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terminate/2, code_change/3]).
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-include("ejabberd.hrl").
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-include("logger.hrl").
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-include_lib("kernel/include/file.hrl").
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-define(ZERO_DATETIME, {{0,0,0}, {0,0,0}}).
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-record(state, {}).
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start_link() ->
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gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
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init([]) ->
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process_flag(trap_exit, true),
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load(),
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xmpp:set_tr_callback({?MODULE, translate}),
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{ok, #state{}}.
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handle_call(_Request, _From, State) ->
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Reply = ok,
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{reply, Reply, State}.
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handle_cast(_Msg, State) ->
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{noreply, State}.
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handle_info(_Info, State) ->
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{noreply, State}.
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terminate(_Reason, _State) ->
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xmpp:set_tr_callback(undefined).
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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-spec reload() -> ok.
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reload() ->
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load(true).
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-spec load() -> ok.
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load() ->
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load(false).
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-spec load(boolean()) -> ok.
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load(ForceCacheRebuild) ->
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{MsgsDirMTime, MsgsDir} = get_msg_dir(),
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{CacheMTime, CacheFile} = get_cache_file(),
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{FilesMTime, MsgFiles} = get_msg_files(MsgsDir),
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LastModified = lists:max([MsgsDirMTime, FilesMTime]),
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if ForceCacheRebuild orelse CacheMTime < LastModified ->
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load(MsgFiles, MsgsDir),
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dump_to_file(CacheFile);
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true ->
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case ets:file2tab(CacheFile) of
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{ok, _} ->
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ok;
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{error, {read_error, {file_error, _, enoent}}} ->
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load(MsgFiles, MsgsDir);
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{error, {read_error, {file_error, _, Reason}}} ->
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?WARNING_MSG("Failed to read translation cache from ~s: ~s",
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[CacheFile, file:format_error(Reason)]),
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load(MsgFiles, MsgsDir);
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{error, Reason} ->
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?WARNING_MSG("Failed to read translation cache from ~s: ~p",
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[CacheFile, Reason]),
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load(MsgFiles, MsgsDir)
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end
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end.
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-spec load([file:filename()], file:filename()) -> ok.
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load(Files, Dir) ->
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try ets:new(translations, [named_table, public])
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catch _:badarg -> ok
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end,
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case Files of
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[] ->
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?WARNING_MSG("No translation files found in ~s, "
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"check directory access", [Dir]);
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_ ->
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ets:delete_all_objects(translations),
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?INFO_MSG("Building translation cache, this may take a while", []),
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lists:foreach(
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fun(File) ->
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BaseName = filename:basename(File),
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Lang = str:to_lower(filename:rootname(BaseName)),
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load_file(iolist_to_binary(Lang), File)
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end, Files)
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end.
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load_file(Lang, File) ->
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case file:open(File, [read]) of
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{ok, Fd} ->
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io:setopts(Fd, [{encoding,latin1}]),
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load_file_loop(Fd, 1, File, Lang),
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file:close(Fd);
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{error, Error} ->
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ExitText = iolist_to_binary([File, ": ",
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file:format_error(Error)]),
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?ERROR_MSG("Problem loading translation file ~n~s",
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[ExitText]),
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exit(ExitText)
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end.
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load_file_loop(Fd, Line, File, Lang) ->
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case io:read(Fd, '', Line) of
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{ok,{Orig, Trans}, NextLine} ->
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Trans1 = case Trans of
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<<"">> -> Orig;
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_ -> Trans
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end,
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ets:insert(translations,
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{{Lang, iolist_to_binary(Orig)},
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iolist_to_binary(Trans1)}),
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load_file_loop(Fd, NextLine, File, Lang);
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{ok,_, _NextLine} ->
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ExitText = iolist_to_binary([File,
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" approximately in the line ",
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Line]),
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?ERROR_MSG("Problem loading translation file ~n~s",
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[ExitText]),
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exit(ExitText);
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{error,
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{_LineNumber, erl_parse, _ParseMessage} = Reason} ->
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ExitText = iolist_to_binary([File,
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" approximately in the line ",
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file:format_error(Reason)]),
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?ERROR_MSG("Problem loading translation file ~n~s",
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[ExitText]),
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exit(ExitText);
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{error, Reason} ->
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ExitText = iolist_to_binary([File, ": ",
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file:format_error(Reason)]),
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?ERROR_MSG("Problem loading translation file ~n~s",
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[ExitText]),
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exit(ExitText);
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{eof,_Line} ->
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ok
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end.
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-spec translate(binary(), binary()) -> binary().
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translate(Lang, Msg) ->
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LLang = ascii_tolower(Lang),
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case ets:lookup(translations, {LLang, Msg}) of
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[{_, Trans}] -> Trans;
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_ ->
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ShortLang = case str:tokens(LLang, <<"-">>) of
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[] -> LLang;
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[SL | _] -> SL
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end,
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case ShortLang of
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<<"en">> -> Msg;
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LLang -> translate(Msg);
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_ ->
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case ets:lookup(translations, {ShortLang, Msg}) of
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[{_, Trans}] -> Trans;
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_ -> translate(Msg)
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end
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end
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end.
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translate(Msg) ->
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case ?MYLANG of
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<<"en">> -> Msg;
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Lang ->
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LLang = ascii_tolower(Lang),
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case ets:lookup(translations, {LLang, Msg}) of
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[{_, Trans}] -> Trans;
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_ ->
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ShortLang = case str:tokens(LLang, <<"-">>) of
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[] -> LLang;
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[SL | _] -> SL
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end,
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case ShortLang of
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<<"en">> -> Msg;
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Lang -> Msg;
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_ ->
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case ets:lookup(translations, {ShortLang, Msg}) of
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[{_, Trans}] -> Trans;
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_ -> Msg
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end
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end
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end
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end.
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ascii_tolower(B) ->
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iolist_to_binary(ascii_tolower_s(binary_to_list(B))).
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ascii_tolower_s([C | Cs]) when C >= $A, C =< $Z ->
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[C + ($a - $A) | ascii_tolower_s(Cs)];
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ascii_tolower_s([C | Cs]) -> [C | ascii_tolower_s(Cs)];
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ascii_tolower_s([]) -> [].
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-spec get_msg_dir() -> {calendar:datetime(), file:filename()}.
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get_msg_dir() ->
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Dir = case os:getenv("EJABBERD_MSGS_PATH") of
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false ->
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case code:priv_dir(ejabberd) of
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{error, _} -> ?MSGS_DIR;
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Path -> filename:join([Path, "msgs"])
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end;
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Path -> Path
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end,
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case file:read_file_info(Dir) of
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{ok, #file_info{mtime = MTime}} ->
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{MTime, Dir};
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{error, Reason} ->
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?ERROR_MSG("Failed to read directory ~s: ~s",
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[Dir, file:format_error(Reason)]),
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{?ZERO_DATETIME, Dir}
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end.
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-spec get_msg_files(file:filename()) -> {calendar:datetime(), [file:filename()]}.
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get_msg_files(MsgsDir) ->
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Res = filelib:fold_files(
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MsgsDir, ".+\\.msg", false,
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fun(File, {MTime, Files} = Acc) ->
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case file:read_file_info(File) of
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{ok, #file_info{mtime = Time}} ->
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{lists:max([MTime, Time]), [File|Files]};
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{error, Reason} ->
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?ERROR_MSG("Failed to read translation file ~s: ~s",
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[File, file:format_error(Reason)]),
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Acc
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end
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end, {?ZERO_DATETIME, []}),
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case Res of
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{_, []} ->
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case file:list_dir(MsgsDir) of
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{ok, _} -> ok;
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{error, Reason} ->
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?ERROR_MSG("Failed to read directory ~s: ~s",
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[MsgsDir, file:format_error(Reason)])
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end;
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_ ->
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ok
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end,
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Res.
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-spec get_cache_file() -> {calendar:datetime(), file:filename()}.
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get_cache_file() ->
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MnesiaDir = mnesia:system_info(directory),
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CacheFile = filename:join(MnesiaDir, "translations.cache"),
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CacheMTime = case file:read_file_info(CacheFile) of
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{ok, #file_info{mtime = Time}} -> Time;
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{error, _} -> ?ZERO_DATETIME
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end,
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{CacheMTime, CacheFile}.
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-spec dump_to_file(file:filename()) -> ok.
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dump_to_file(CacheFile) ->
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case ets:tab2file(translations, CacheFile) of
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ok -> ok;
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{error, Reason} ->
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?WARNING_MSG("Failed to create translation cache in ~s: ~p",
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[CacheFile, Reason])
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end.
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