MqttCodecUtil.java — netty Source File

Source Code

/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package io.netty.handler.codec.mqtt;

import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.DecoderException;
import io.netty.util.Attribute;
import io.netty.util.AttributeKey;

import static io.netty.handler.codec.mqtt.MqttConstant.MIN_CLIENT_ID_LENGTH;

final class MqttCodecUtil {

    static final AttributeKey<MqttVersion> MQTT_VERSION_KEY = AttributeKey.valueOf("NETTY_CODEC_MQTT_VERSION");

    static MqttVersion getMqttVersion(ChannelHandlerContext ctx) {
        Attribute<MqttVersion> attr = ctx.channel().attr(MQTT_VERSION_KEY);
        MqttVersion version = attr.get();
        if (version == null) {
            return MqttVersion.MQTT_3_1_1;
        }
        return version;
    }

    static void setMqttVersion(ChannelHandlerContext ctx, MqttVersion version) {
        Attribute<MqttVersion> attr = ctx.channel().attr(MQTT_VERSION_KEY);
        attr.set(version);
    }

    static boolean isValidPublishTopicName(String topicName) {
        // publish topic name must not contain any wildcard
        for (int i = 0; i < topicName.length(); i++) {
            char c = topicName.charAt(i);
            if (c == '#' || c == '+') {
                return false;
            }
        }
        return true;
    }

    static boolean isValidMessageId(int messageId) {
        return messageId != 0;
    }

    static boolean isValidClientId(MqttVersion mqttVersion, int maxClientIdLength, String clientId) {
        if (mqttVersion == MqttVersion.MQTT_3_1) {
// ... (73 more lines)