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https://github.com/processone/ejabberd.git
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3fec782494
The option can be used as a replacement of 'host' option
when several (sub)domains are needed to be registered for the module.
Note that you cannot combine both 'host' and 'hosts' in the config
because 'host' option is of a higher priority. Example:
mod_pubsub:
...
hosts:
- "pubsub1.@HOST@"
- "pubsub2.@HOST@"
Fixes #1883
210 lines
8.1 KiB
Erlang
210 lines
8.1 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, {hosts = [] :: [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(hosts) ->
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fun(L) -> lists:map(fun iolist_to_binary/1, L) end;
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mod_opt_type(_) -> [host, hosts].
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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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Hosts = gen_mod:get_opt_hosts(Host, Opts,
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<<"echo.@HOST@">>),
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lists:foreach(
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fun(H) ->
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ejabberd_router:register_route(H, Host)
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end, Hosts),
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{ok, #state{hosts = Hosts}}.
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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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NewMyHosts = gen_mod:get_opt_hosts(Host, NewOpts,
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<<"echo.@HOST@">>),
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OldMyHosts = gen_mod:get_opt_hosts(Host, OldOpts,
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<<"echo.@HOST@">>),
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lists:foreach(
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fun(H) ->
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ejabberd_router:unregister_route(H)
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end, OldMyHosts -- NewMyHosts),
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lists:foreach(
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fun(H) ->
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ejabberd_router:register_route(H, Host)
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end, NewMyHosts -- OldMyHosts),
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{noreply, State#state{hosts = NewMyHosts}};
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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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lists:foreach(fun ejabberd_router:unregister_route/1, State#state.hosts).
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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:encode(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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