203 lines
7.9 KiB
Erlang
203 lines
7.9 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : mod_echo.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : Simple ejabberd module.
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%%% Created : 15 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(mod_echo).
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-author('alexey@process-one.net').
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-behaviour(gen_server).
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-behaviour(gen_mod).
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%% API
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-export([start/2, stop/1, reload/3, do_client_version/3]).
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-export([init/1, handle_call/3, handle_cast/2,
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handle_info/2, terminate/2, code_change/3,
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mod_opt_type/1, depends/2]).
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-include("ejabberd.hrl").
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-include("logger.hrl").
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-include("xmpp.hrl").
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-record(state, {host = <<"">> :: binary()}).
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%%====================================================================
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%% gen_mod API
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%%====================================================================
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start(Host, Opts) ->
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gen_mod:start_child(?MODULE, Host, Opts).
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stop(Host) ->
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gen_mod:stop_child(?MODULE, Host).
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reload(Host, NewOpts, OldOpts) ->
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Proc = gen_mod:get_module_proc(Host, ?MODULE),
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gen_server:cast(Proc, {reload, Host, NewOpts, OldOpts}).
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depends(_Host, _Opts) ->
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[].
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mod_opt_type(host) -> fun iolist_to_binary/1;
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mod_opt_type(_) -> [host].
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%%====================================================================
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%% gen_server callbacks
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: init(Args) -> {ok, State} |
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%% {ok, State, Timeout} |
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%% ignore |
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%% {stop, Reason}
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%% Description: Initiates the server
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%%--------------------------------------------------------------------
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init([Host, Opts]) ->
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process_flag(trap_exit, true),
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MyHost = gen_mod:get_opt_host(Host, Opts,
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<<"echo.@HOST@">>),
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ejabberd_router:register_route(MyHost, Host),
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{ok, #state{host = MyHost}}.
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%%--------------------------------------------------------------------
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%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
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%% {reply, Reply, State, Timeout} |
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%% {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, Reply, State} |
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%% {stop, Reason, State}
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%% Description: Handling call messages
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%%--------------------------------------------------------------------
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handle_call(stop, _From, State) ->
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{stop, normal, ok, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_cast(Msg, State) -> {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State}
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%% Description: Handling cast messages
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%%--------------------------------------------------------------------
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handle_cast({reload, Host, NewOpts, OldOpts}, State) ->
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NewMyHost = gen_mod:get_opt_host(Host, NewOpts,
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<<"echo.@HOST@">>),
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OldMyHost = gen_mod:get_opt_host(Host, OldOpts,
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<<"echo.@HOST@">>),
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if NewMyHost /= OldMyHost ->
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ejabberd_router:register_route(NewMyHost, Host),
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ejabberd_router:unregister_route(OldMyHost);
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true ->
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ok
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end,
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{noreply, State#state{host = NewMyHost}};
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handle_cast(Msg, State) ->
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?WARNING_MSG("unexpected cast: ~p", [Msg]),
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{noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_info(Info, State) -> {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State}
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%% Description: Handling all non call/cast messages
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%%--------------------------------------------------------------------
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handle_info({route, Packet}, State) ->
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From = xmpp:get_from(Packet),
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To = xmpp:get_to(Packet),
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Packet2 = case From#jid.user of
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<<"">> ->
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Lang = xmpp:get_lang(Packet),
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Txt = <<"User part of JID in 'from' is empty">>,
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xmpp:make_error(
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Packet, xmpp:err_bad_request(Txt, Lang));
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_ ->
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xmpp:set_from_to(Packet, To, From)
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end,
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do_client_version(disabled, To, From),
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ejabberd_router:route(Packet2),
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{noreply, State};
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handle_info(_Info, State) -> {noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: terminate(Reason, State) -> void()
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%% Description: This function is called by a gen_server when it is about to
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%% terminate. It should be the opposite of Module:init/1 and do any necessary
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%% cleaning up. When it returns, the gen_server terminates with Reason.
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%% The return value is ignored.
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%%--------------------------------------------------------------------
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terminate(_Reason, State) ->
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ejabberd_router:unregister_route(State#state.host), ok.
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%%--------------------------------------------------------------------
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%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
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%% Description: Convert process state when code is changed
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%%--------------------------------------------------------------------
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code_change(_OldVsn, State, _Extra) -> {ok, State}.
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%%--------------------------------------------------------------------
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%% Example of routing XMPP packets using Erlang's message passing
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%%--------------------------------------------------------------------
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%% To enable this educational example, edit the function handle_info:
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%% replace the argument 'disabled' with 'enabled' in the call to the
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%% function do_client_version.
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%% ejabberd provides a method to receive XMPP packets using Erlang's
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%% message passing mechanism.
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%%
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%% The packets received by ejabberd are sent
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%% to the local destination process by sending an Erlang message.
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%% This means that you can receive XMPP stanzas in an Erlang process
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%% using Erlang's Receive, as long as this process is registered in
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%% ejabberd as the process which handles the destination JID.
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%%
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%% This example function is called when a client queries the echo service.
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%% This function then sends a query to the client, and waits 5 seconds to
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%% receive an answer. The answer will only be accepted if it was sent
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%% using exactly the same JID. We add a (mostly) random resource to
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%% try to guarantee that the received response matches the request sent.
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%% Finally, the received response is printed in the ejabberd log file.
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%% THIS IS **NOT** HOW TO WRITE ejabberd CODE. THIS CODE IS RETARDED.
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do_client_version(disabled, _From, _To) -> ok;
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do_client_version(enabled, From, To) ->
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Random_resource = randoms:get_string(),
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From2 = From#jid{resource = Random_resource,
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lresource = Random_resource},
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ID = randoms:get_string(),
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Packet = #iq{from = From2, to = To, type = get,
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id = randoms:get_string(),
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sub_els = [#version{}]},
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ejabberd_router:route(Packet),
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receive
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{route,
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#iq{to = To, from = From2,
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id = ID, type = result, sub_els = [#version{} = V]}} ->
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?INFO_MSG("Version of the client ~s:~n~s",
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[jid:to_string(To), xmpp:pp(V)])
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after 5000 -> % Timeout in miliseconds: 5 seconds
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[]
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end.
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