MqttMapper.h

Go to the documentation of this file.

/*
 * MQTTSuite - A lightweight MQTT Integration System
 * Copyright (C) Volker Christian <me@vchrist.at>
 *               2022, 2023, 2024, 2025
 *
 * 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 3 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, see <https://www.gnu.org/licenses/>.
 */
 
/*
 * MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
 
#ifndef MQTTBROKER_LIB_MQTTMAPPER_H
#define MQTTBROKER_LIB_MQTTMAPPER_H
 
namespace iot::mqtt {
    class Topic;
    namespace packets {
        class Publish;
    }
} // namespace iot::mqtt
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
namespace inja {
    class Environment;
}
 
#include <cstdint>
#include <list>
#include <nlohmann/json_fwd.hpp> // IWYU pragma: export
#include <string>
 
#endif
 
namespace mqtt::lib {
 
    class MqttMapper {
    public:
        MqttMapper(const nlohmann::json& mappingJson);
        MqttMapper(const MqttMapper&) = delete;
        MqttMapper& operator=(const MqttMapper&) = delete;
 
        virtual ~MqttMapper();
 
    protected:
        std::string dump();
 
        std::list<iot::mqtt::Topic> extractSubscriptions();
        void publishMappings(const iot::mqtt::packets::Publish& publish);
 
    private:
        virtual void publishMapping(const std::string& topic, const std::string& message, uint8_t qoS, bool retain) = 0;
 
        static void
        extractSubscription(const nlohmann::json& topicLevelJson, const std::string& topic, std::list<iot::mqtt::Topic>& topicList);
        static void
        extractSubscriptions(const nlohmann::json& mappingJson, const std::string& topic, std::list<iot::mqtt::Topic>& topicList);
 
        nlohmann::json findMatchingTopicLevel(const nlohmann::json& topicLevel, const std::string& topic);
 
        void publishMappedTemplate(const nlohmann::json& templateMapping, nlohmann::json& json);
        void
        publishMappedTemplates(const nlohmann::json& templateMapping, nlohmann::json& json, const iot::mqtt::packets::Publish& publish);
 
        void publishMappedMessage(const std::string& topic, const std::string& message, uint8_t qoS, bool retain);
        void publishMappedMessage(const nlohmann::json& staticMapping, const iot::mqtt::packets::Publish& publish);
        void publishMappedMessages(const nlohmann::json& staticMapping, const iot::mqtt::packets::Publish& publish);
 
        const nlohmann::json& mappingJson;
 
        std::list<void*> pluginHandles;
 
        inja::Environment* injaEnvironment;
    };
 
} // namespace mqtt::lib
 
#endif // MQTTBROKER_LIB_MQTTMAPPER_H