%%%-------------------------------------------------------------------
%%% File : mod_bosh.erl
%%% Author : Evgeniy Khramtsov <ekhramtsov@process-one.net>
%%% Purpose : This module acts as a bridge to ejabberd_bosh which implements
%%% the real stuff, this is to handle the new pluggable architecture
%%% for extending ejabberd's http service.
%%% Created : 20 Jul 2011 by Evgeniy Khramtsov <ekhramtsov@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2022 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_bosh).
-author('steve@zeank.in-berlin.de').
%%-define(ejabberd_debug, true).
-behaviour(gen_mod).
-export([start_link/0]).
-export([start/2, stop/1, reload/3, process/2, open_session/2,
close_session/1, find_session/1, clean_cache/1]).
-export([depends/2, mod_opt_type/1, mod_options/1, mod_doc/0]).
-include("logger.hrl").
-include_lib("stdlib/include/ms_transform.hrl").
-include_lib("xmpp/include/xmpp.hrl").
-include("ejabberd_http.hrl").
-include("bosh.hrl").
-include("translate.hrl").
-callback init() -> any().
-callback open_session(binary(), pid()) -> ok | {error, any()}.
-callback close_session(binary()) -> ok | {error, any()}.
-callback find_session(binary()) -> {ok, pid()} | {error, any()}.
-callback use_cache() -> boolean().
-callback cache_nodes() -> [node()].
-optional_callbacks([use_cache/0, cache_nodes/0]).
%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
process([], #request{method = 'POST', data = <<>>}) ->
?DEBUG("Bad Request: no data", []),
{400, ?HEADER(?CT_XML),
#xmlel{name = <<"h1">>, attrs = [],
children = [{xmlcdata, <<"400 Bad Request">>}]}};
process([],
#request{method = 'POST', data = Data, ip = IP, headers = Hdrs}) ->
?DEBUG("Incoming data: ~p", [Data]),
Type = get_type(Hdrs),
ejabberd_bosh:process_request(Data, IP, Type);
process([], #request{method = 'GET', data = <<>>}) ->
{200, ?HEADER(?CT_XML), get_human_html_xmlel()};
process([], #request{method = 'OPTIONS', data = <<>>}) ->
{200, ?OPTIONS_HEADER, []};
process(_Path, _Request) ->
?DEBUG("Bad Request: ~p", [_Request]),
{400, ?HEADER(?CT_XML),
#xmlel{name = <<"h1">>, attrs = [],
children = [{xmlcdata, <<"400 Bad Request">>}]}}.
-spec open_session(binary(), pid()) -> ok | {error, any()}.
open_session(SID, Pid) ->
Mod = gen_mod:ram_db_mod(global, ?MODULE),
case Mod:open_session(SID, Pid) of
ok ->
delete_cache(Mod, SID);
{error, _} = Err ->
Err
end.
-spec close_session(binary()) -> ok.
close_session(SID) ->
Mod = gen_mod:ram_db_mod(global, ?MODULE),
Mod:close_session(SID),
delete_cache(Mod, SID).
-spec find_session(binary()) -> {ok, pid()} | error.
find_session(SID) ->
Mod = gen_mod:ram_db_mod(global, ?MODULE),
case use_cache(Mod) of
true ->
ets_cache:lookup(
?BOSH_CACHE, SID,
fun() ->
case Mod:find_session(SID) of
{ok, Pid} -> {ok, Pid};
{error, _} -> error
end
end);
false ->
case Mod:find_session(SID) of
{ok, Pid} -> {ok, Pid};
{error, _} -> error
end
end.
start(Host, _Opts) ->
Mod = gen_mod:ram_db_mod(Host, ?MODULE),
init_cache(Host, Mod),
Mod:init(),
clean_cache(),
TmpSup = gen_mod:get_module_proc(Host, ?MODULE),
TmpSupSpec = {TmpSup,
{ejabberd_tmp_sup, start_link, [TmpSup, ejabberd_bosh]},
permanent, infinity, supervisor, [ejabberd_tmp_sup]},
supervisor:start_child(ejabberd_gen_mod_sup, TmpSupSpec).
stop(Host) ->
TmpSup = gen_mod:get_module_proc(Host, ?MODULE),
supervisor:terminate_child(ejabberd_gen_mod_sup, TmpSup),
supervisor:delete_child(ejabberd_gen_mod_sup, TmpSup).
reload(Host, _NewOpts, _OldOpts) ->
Mod = gen_mod:ram_db_mod(global, ?MODULE),
init_cache(Host, Mod),
Mod:init(),
ok.
%%%===================================================================
%%% Internal functions
%%%===================================================================
get_type(Hdrs) ->
try
{_, S} = lists:keyfind('Content-Type', 1, Hdrs),
[T|_] = str:tokens(S, <<";">>),
[_, <<"json">>] = str:tokens(T, <<"/">>),
json
catch _:_ ->
xml
end.
depends(_Host, _Opts) ->
[].
mod_opt_type(json) ->
econf:and_then(
econf:bool(),
fun(false) -> false;
(true) ->
ejabberd:start_app(jiffy),
true
end);
mod_opt_type(max_concat) ->
econf:pos_int(unlimited);
mod_opt_type(max_inactivity) ->
econf:timeout(second);
mod_opt_type(max_pause) ->
econf:timeout(second);
mod_opt_type(prebind) ->
econf:bool();
mod_opt_type(queue_type) ->
econf:queue_type();
mod_opt_type(ram_db_type) ->
econf:db_type(?MODULE);
mod_opt_type(use_cache) ->
econf:bool();
mod_opt_type(cache_size) ->
econf:pos_int(infinity);
mod_opt_type(cache_missed) ->
econf:bool();
mod_opt_type(cache_life_time) ->
econf:timeout(second, infinity).
-spec mod_options(binary()) -> [{json, boolean()} |
{atom(), term()}].
mod_options(Host) ->
[{json, false},
{max_concat, unlimited},
{max_inactivity, timer:seconds(30)},
{max_pause, timer:seconds(120)},
{prebind, false},
{ram_db_type, ejabberd_config:default_ram_db(Host, ?MODULE)},
{queue_type, ejabberd_option:queue_type(Host)},
{use_cache, ejabberd_option:use_cache(Host)},
{cache_size, ejabberd_option:cache_size(Host)},
{cache_missed, ejabberd_option:cache_missed(Host)},
{cache_life_time, ejabberd_option:cache_life_time(Host)}].
mod_doc() ->
#{desc =>
?T("This module implements XMPP over BOSH as defined in "
"https://xmpp.org/extensions/xep-0124.html[XEP-0124] and "
"https://xmpp.org/extensions/xep-0206.html[XEP-0206]. BOSH "
"stands for Bidirectional-streams Over Synchronous HTTP. "
"It makes it possible to simulate long lived connections "
"required by XMPP over the HTTP protocol. In practice, "
"this module makes it possible to use XMPP in a browser without "
"WebSocket support and more generally to have a way to use "
"XMPP while having to get through an HTTP proxy."),
opts =>
[{json,
#{value => "true | false",
desc => ?T("This option has no effect.")}},
{max_concat,
#{value => "pos_integer() | infinity",
desc =>
?T("This option limits the number of stanzas that the server "
"will send in a single bosh request. "
"The default value is 'unlimited'.")}},
{max_inactivity,
#{value => "timeout()",
desc =>
?T("The option defines the maximum inactivity period. "
"The default value is '30' seconds.")}},
{max_pause,
#{value => "pos_integer()",
desc =>
?T("Indicate the maximum length of a temporary session pause "
"(in seconds) that a client can request. "
"The default value is '120'.")}},
{prebind,
#{value => "true | false",
desc =>
?T("If enabled, the client can create the session without "
"going through authentication. Basically, it creates a "
"new session with anonymous authentication. "
"The default value is 'false'.")}},
{queue_type,
#{value => "ram | file",
desc =>
?T("Same as top-level _`queue_type`_ option, but applied to this module only.")}},
{ram_db_type,
#{value => "mnesia | sql | redis",
desc =>
?T("Same as top-level _`default_ram_db`_ option, "
"but applied to this module only.")}},
{use_cache,
#{value => "true | false",
desc =>
?T("Same as top-level _`use_cache`_ option, but applied to this module only.")}},
{cache_size,
#{value => "pos_integer() | infinity",
desc =>
?T("Same as top-level _`cache_size`_ option, but applied to this module only.")}},
{cache_missed,
#{value => "true | false",
desc =>
?T("Same as top-level _`cache_missed`_ option, but applied to this module only.")}},
{cache_life_time,
#{value => "timeout()",
desc =>
?T("Same as top-level _`cache_life_time`_ option, but applied to this module only.")}}],
example =>
["listen:",
" -",
" port: 5222",
" module: ejabberd_c2s",
" -",
" port: 5443",
" module: ejabberd_http",
" request_handlers:",
" /bosh: mod_bosh",
"",
"modules:",
" mod_bosh: {}"]}.
%%%----------------------------------------------------------------------
%%% Cache stuff
%%%----------------------------------------------------------------------
-spec init_cache(binary(), module()) -> ok.
init_cache(Host, Mod) ->
case use_cache(Mod, Host) of
true ->
ets_cache:new(?BOSH_CACHE, cache_opts(Host));
false ->
ets_cache:delete(?BOSH_CACHE)
end.
-spec use_cache(module()) -> boolean().
use_cache(Mod) ->
use_cache(Mod, global).
-spec use_cache(module(), global | binary()) -> boolean().
use_cache(Mod, Host) ->
case erlang:function_exported(Mod, use_cache, 0) of
true -> Mod:use_cache();
false -> mod_bosh_opt:use_cache(Host)
end.
-spec cache_nodes(module()) -> [node()].
cache_nodes(Mod) ->
case erlang:function_exported(Mod, cache_nodes, 0) of
true -> Mod:cache_nodes();
false -> ejabberd_cluster:get_nodes()
end.
-spec delete_cache(module(), binary()) -> ok.
delete_cache(Mod, SID) ->
case use_cache(Mod) of
true ->
ets_cache:delete(?BOSH_CACHE, SID, cache_nodes(Mod));
false ->
ok
end.
-spec cache_opts(binary()) -> [proplists:property()].
cache_opts(Host) ->
MaxSize = mod_bosh_opt:cache_size(Host),
CacheMissed = mod_bosh_opt:cache_missed(Host),
LifeTime = mod_bosh_opt:cache_life_time(Host),
[{max_size, MaxSize}, {cache_missed, CacheMissed}, {life_time, LifeTime}].
-spec clean_cache(node()) -> non_neg_integer().
clean_cache(Node) ->
ets_cache:filter(
?BOSH_CACHE,
fun(_, error) ->
false;
(_, {ok, Pid}) ->
node(Pid) /= Node
end).
-spec clean_cache() -> ok.
clean_cache() ->
ejabberd_cluster:eval_everywhere(?MODULE, clean_cache, [node()]).
%%%----------------------------------------------------------------------
%%% Help Web Page
%%%----------------------------------------------------------------------
get_human_html_xmlel() ->
Heading = <<"ejabberd ",
(iolist_to_binary(atom_to_list(?MODULE)))/binary>>,
#xmlel{name = <<"html">>,
attrs =
[{<<"xmlns">>, <<"http://www.w3.org/1999/xhtml">>}],
children =
[#xmlel{name = <<"head">>,
children =
[#xmlel{name = <<"title">>,
children = [{xmlcdata, Heading}]},
#xmlel{name = <<"style">>,
children = [{xmlcdata, get_style_cdata()}]}]},
#xmlel{name = <<"body">>,
children =
[#xmlel{name = <<"div">>,
attrs = [{<<"class">>, <<"container">>}],
children = get_container_children(Heading)}]}]}.
get_container_children(Heading) ->
[#xmlel{name = <<"div">>,
attrs = [{<<"class">>, <<"section">>}],
children =
[#xmlel{name = <<"div">>,
attrs = [{<<"class">>, <<"block">>}],
children =
[#xmlel{name = <<"a">>,
attrs = [{<<"href">>, <<"https://www.ejabberd.im">>}],
children =
[#xmlel{name = <<"img">>,
attrs = [{<<"height">>, <<"32">>},
{<<"src">>, get_image_src()}]}]}]}]},
#xmlel{name = <<"div">>,
attrs = [{<<"class">>, <<"white section">>}],
children =
[#xmlel{name = <<"div">>,
attrs = [{<<"class">>, <<"block">>}],
children =
[#xmlel{name = <<"h1">>, children = [{xmlcdata, Heading}]},
#xmlel{name = <<"p">>, children =
[{xmlcdata, <<"An implementation of ">>},
#xmlel{name = <<"a">>,
attrs = [{<<"href">>, <<"http://xmpp.org/extensions/xep-0206.html">>}],
children = [{xmlcdata, <<"XMPP over BOSH (XEP-0206)">>}]}]},
#xmlel{name = <<"p">>, children =
[{xmlcdata, <<"This web page is only informative. To "
"use HTTP-Bind you need a Jabber/XMPP "
"client that supports it.">>}]}]}]},
#xmlel{name = <<"div">>,
attrs = [{<<"class">>, <<"section">>}],
children =
[#xmlel{name = <<"div">>,
attrs = [{<<"class">>, <<"block">>}],
children =
[#xmlel{name = <<"a">>,
attrs = [{<<"href">>, <<"https://www.ejabberd.im">>},
{<<"title">>, <<"ejabberd XMPP server">>}],
children = [{xmlcdata, <<"ejabberd">>}]},
{xmlcdata, <<" is maintained by ">>},
#xmlel{name = <<"a">>,
attrs = [{<<"href">>, <<"https://www.process-one.net">>},
{<<"title">>, <<"ProcessOne - Leader in Instant Messaging and Push Solutions">>}],
children = [{xmlcdata, <<"ProcessOne">>}]} ]}]}
].
get_style_cdata() ->
case misc:read_css("bosh.css") of
{ok, Data} -> Data;
{error, _} -> <<>>
end.
get_image_src() ->
case misc:read_img("bosh-logo.png") of
{ok, Img} ->
B64Img = base64:encode(Img),
<<"data:image/png;base64,", B64Img/binary>>;
{error, _} ->
<<>>
end.
