57 lines
1.9 KiB
Erlang
57 lines
1.9 KiB
Erlang
%% Copyright (c) 2013-2019 EMQ Technologies Co., Ltd. All Rights Reserved.
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%%
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%% Licensed under the Apache License, Version 2.0 (the "License");
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%% you may not use this file except in compliance with the License.
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%% You may obtain a copy of the License at
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%%
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%% http://www.apache.org/licenses/LICENSE-2.0
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%%
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%% Unless required by applicable law or agreed to in writing, software
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%% distributed under the License is distributed on an "AS IS" BASIS,
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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%% See the License for the specific language governing permissions and
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%% limitations under the License.
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-module(emqx_mod_subscription).
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-behaviour(emqx_gen_mod).
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-include_lib("emqx.hrl").
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-include_lib("emqx_mqtt.hrl").
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%% APIs
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-export([on_session_created/3]).
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%% emqx_gen_mod callbacks
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-export([ load/1
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, unload/1
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]).
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%%------------------------------------------------------------------------------
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%% Load/Unload Hook
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%%------------------------------------------------------------------------------
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load(Topics) ->
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emqx_hooks:add('session.created', fun ?MODULE:on_session_created/3, [Topics]).
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on_session_created(#{client_id := ClientId}, SessAttrs, Topics) ->
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Username = proplists:get_value(username, SessAttrs),
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Replace = fun(Topic) ->
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rep(<<"%u">>, Username, rep(<<"%c">>, ClientId, Topic))
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end,
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emqx_session:subscribe(self(), [{Replace(Topic), #{qos => QoS}} || {Topic, QoS} <- Topics]).
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unload(_) ->
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emqx_hooks:del('session.created', fun ?MODULE:on_session_created/3).
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%%------------------------------------------------------------------------------
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%% Internal functions
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%%------------------------------------------------------------------------------
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rep(<<"%c">>, ClientId, Topic) ->
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emqx_topic:feed_var(<<"%c">>, ClientId, Topic);
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rep(<<"%u">>, undefined, Topic) ->
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Topic;
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rep(<<"%u">>, Username, Topic) ->
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emqx_topic:feed_var(<<"%u">>, Username, Topic).
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