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-%%%----------------------------------------------------------------------
-%%% File : mod_echo.erl
-%%% Author : Alexey Shchepin <alexey@process-one.net>
-%%% Purpose : Simple ejabberd module.
-%%% Created : 15 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
-%%%
-%%%
-%%% ejabberd, Copyright (C) 2002-2019 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(mod_echo).
-
--author('alexey@process-one.net').
-
--behaviour(gen_server).
-
--behaviour(gen_mod).
-
-%% API
--export([start/2, stop/1, reload/3, do_client_version/3]).
-
--export([init/1, handle_call/3, handle_cast/2,
- handle_info/2, terminate/2, code_change/3,
- mod_opt_type/1, depends/2, mod_options/1]).
-
--include("logger.hrl").
-
--include("xmpp.hrl").
-
--record(state, {hosts = [] :: [binary()]}).
-
-%%====================================================================
-%% gen_mod API
-%%====================================================================
-start(Host, Opts) ->
- gen_mod:start_child(?MODULE, Host, Opts).
-
-stop(Host) ->
- gen_mod:stop_child(?MODULE, Host).
-
-reload(Host, NewOpts, OldOpts) ->
- Proc = gen_mod:get_module_proc(Host, ?MODULE),
- gen_server:cast(Proc, {reload, Host, NewOpts, OldOpts}).
-
-depends(_Host, _Opts) ->
- [].
-
-mod_opt_type(host) -> fun ejabberd_config:v_host/1;
-mod_opt_type(hosts) -> fun ejabberd_config:v_hosts/1.
-
-mod_options(_Host) ->
- [{host, <<"echo.@HOST@">>}, {hosts, []}].
-
-%%====================================================================
-%% gen_server callbacks
-%%====================================================================
-
-%%--------------------------------------------------------------------
-%% Function: init(Args) -> {ok, State} |
-%% {ok, State, Timeout} |
-%% ignore |
-%% {stop, Reason}
-%% Description: Initiates the server
-%%--------------------------------------------------------------------
-init([Host, Opts]) ->
- process_flag(trap_exit, true),
- Hosts = gen_mod:get_opt_hosts(Host, Opts),
- lists:foreach(
- fun(H) ->
- ejabberd_router:register_route(H, Host)
- end, Hosts),
- {ok, #state{hosts = Hosts}}.
-
-%%--------------------------------------------------------------------
-%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
-%% {reply, Reply, State, Timeout} |
-%% {noreply, State} |
-%% {noreply, State, Timeout} |
-%% {stop, Reason, Reply, State} |
-%% {stop, Reason, State}
-%% Description: Handling call messages
-%%--------------------------------------------------------------------
-handle_call(stop, _From, State) ->
- {stop, normal, ok, State}.
-
-%%--------------------------------------------------------------------
-%% Function: handle_cast(Msg, State) -> {noreply, State} |
-%% {noreply, State, Timeout} |
-%% {stop, Reason, State}
-%% Description: Handling cast messages
-%%--------------------------------------------------------------------
-handle_cast({reload, Host, NewOpts, OldOpts}, State) ->
- NewMyHosts = gen_mod:get_opt_hosts(Host, NewOpts),
- OldMyHosts = gen_mod:get_opt_hosts(Host, OldOpts),
- lists:foreach(
- fun(H) ->
- ejabberd_router:unregister_route(H)
- end, OldMyHosts -- NewMyHosts),
- lists:foreach(
- fun(H) ->
- ejabberd_router:register_route(H, Host)
- end, NewMyHosts -- OldMyHosts),
- {noreply, State#state{hosts = NewMyHosts}};
-handle_cast(Msg, State) ->
- ?WARNING_MSG("unexpected cast: ~p", [Msg]),
- {noreply, State}.
-
-%%--------------------------------------------------------------------
-%% Function: handle_info(Info, State) -> {noreply, State} |
-%% {noreply, State, Timeout} |
-%% {stop, Reason, State}
-%% Description: Handling all non call/cast messages
-%%--------------------------------------------------------------------
-handle_info({route, Packet}, State) ->
- From = xmpp:get_from(Packet),
- To = xmpp:get_to(Packet),
- Packet2 = case From#jid.user of
- <<"">> ->
- Lang = xmpp:get_lang(Packet),
- Txt = <<"User part of JID in 'from' is empty">>,
- xmpp:make_error(
- Packet, xmpp:err_bad_request(Txt, Lang));
- _ ->
- xmpp:set_from_to(Packet, To, From)
- end,
- do_client_version(disabled, To, From),
- ejabberd_router:route(Packet2),
- {noreply, State};
-handle_info(_Info, State) -> {noreply, State}.
-
-%%--------------------------------------------------------------------
-%% Function: terminate(Reason, State) -> void()
-%% Description: This function is called by a gen_server when it is about to
-%% terminate. It should be the opposite of Module:init/1 and do any necessary
-%% cleaning up. When it returns, the gen_server terminates with Reason.
-%% The return value is ignored.
-%%--------------------------------------------------------------------
-terminate(_Reason, State) ->
- lists:foreach(fun ejabberd_router:unregister_route/1, State#state.hosts).
-
-%%--------------------------------------------------------------------
-%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
-%% Description: Convert process state when code is changed
-%%--------------------------------------------------------------------
-code_change(_OldVsn, State, _Extra) -> {ok, State}.
-
-%%--------------------------------------------------------------------
-%% Example of routing XMPP packets using Erlang's message passing
-%%--------------------------------------------------------------------
-
-%% To enable this educational example, edit the function handle_info:
-%% replace the argument 'disabled' with 'enabled' in the call to the
-%% function do_client_version.
-
-%% ejabberd provides a method to receive XMPP packets using Erlang's
-%% message passing mechanism.
-%%
-%% The packets received by ejabberd are sent
-%% to the local destination process by sending an Erlang message.
-%% This means that you can receive XMPP stanzas in an Erlang process
-%% using Erlang's Receive, as long as this process is registered in
-%% ejabberd as the process which handles the destination JID.
-%%
-%% This example function is called when a client queries the echo service.
-%% This function then sends a query to the client, and waits 5 seconds to
-%% receive an answer. The answer will only be accepted if it was sent
-%% using exactly the same JID. We add a (mostly) random resource to
-%% try to guarantee that the received response matches the request sent.
-%% Finally, the received response is printed in the ejabberd log file.
-
-%% THIS IS **NOT** HOW TO WRITE ejabberd CODE. THIS CODE IS RETARDED.
-
-do_client_version(disabled, _From, _To) -> ok;
-do_client_version(enabled, From, To) ->
- Random_resource = p1_rand:get_string(),
- From2 = From#jid{resource = Random_resource,
- lresource = Random_resource},
- ID = p1_rand:get_string(),
- Packet = #iq{from = From2, to = To, type = get,
- id = p1_rand:get_string(),
- sub_els = [#version{}]},
- ejabberd_router:route(Packet),
- receive
- {route,
- #iq{to = To, from = From2,
- id = ID, type = result, sub_els = [#version{} = V]}} ->
- ?INFO_MSG("Version of the client ~s:~n~s",
- [jid:encode(To), xmpp:pp(V)])
- after 5000 -> % Timeout in miliseconds: 5 seconds
- []
- end.
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