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HiveMQ MQTT Client is an MQTT 5.0 and MQTT 3.1.1 compatible and feature-rich high-performance Java client library with different API flavours and backpressure support
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/*
* Copyright 2018-present HiveMQ and the HiveMQ Community
*
* Licensed 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
*
* http://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 com.hivemq.client.internal.mqtt.codec.encoder.mqtt5;
import com.hivemq.client.internal.mqtt.codec.encoder.MqttEncoderContext;
import com.hivemq.client.internal.mqtt.codec.encoder.MqttMessageEncoder;
import com.hivemq.client.internal.mqtt.datatypes.MqttUtf8StringImpl;
import com.hivemq.client.internal.mqtt.datatypes.MqttVariableByteInteger;
import com.hivemq.client.internal.mqtt.message.auth.MqttEnhancedAuth;
import com.hivemq.client.internal.mqtt.message.auth.MqttSimpleAuth;
import com.hivemq.client.internal.mqtt.message.connect.MqttConnect;
import com.hivemq.client.internal.mqtt.message.connect.MqttConnectRestrictions;
import com.hivemq.client.internal.mqtt.message.connect.MqttStatefulConnect;
import com.hivemq.client.internal.mqtt.message.publish.MqttWillPublish;
import com.hivemq.client.internal.mqtt.message.publish.MqttWillPublishProperty;
import com.hivemq.client.mqtt.exceptions.MqttEncodeException;
import com.hivemq.client.mqtt.mqtt5.message.Mqtt5MessageType;
import io.netty.buffer.ByteBuf;
import org.jetbrains.annotations.NotNull;
import javax.inject.Inject;
import javax.inject.Singleton;
import static com.hivemq.client.internal.mqtt.codec.encoder.MqttMessageEncoderUtil.*;
import static com.hivemq.client.internal.mqtt.codec.encoder.mqtt5.Mqtt5MessageEncoderUtil.*;
import static com.hivemq.client.internal.mqtt.message.connect.MqttConnect.DEFAULT_SESSION_EXPIRY_INTERVAL;
import static com.hivemq.client.internal.mqtt.message.connect.MqttConnectProperty.*;
/**
* @author Silvio Giebl
*/
@Singleton
public class Mqtt5ConnectEncoder extends MqttMessageEncoder {
private static final int FIXED_HEADER = Mqtt5MessageType.CONNECT.getCode() << 4;
private static final byte PROTOCOL_VERSION = 5;
private static final int VARIABLE_HEADER_FIXED_LENGTH =
6 /* protocol name */ + 1 /* protocol version */ + 1 /* connect flags */ + 2 /* keep alive */;
private final @NotNull Mqtt5PublishEncoder publishEncoder;
@Inject
Mqtt5ConnectEncoder(final @NotNull Mqtt5PublishEncoder publishEncoder) {
this.publishEncoder = publishEncoder;
}
@Override
protected @NotNull ByteBuf encode(
final @NotNull MqttStatefulConnect message, final @NotNull MqttEncoderContext context) {
int propertyLength = propertyLength(message);
final int willPropertyLength = willPropertyLength(message);
final int remainingLengthWithoutProperties = remainingLengthWithoutProperties(message);
int remainingLength = remainingLength(remainingLengthWithoutProperties, propertyLength, willPropertyLength);
int encodedLength = encodedPacketLength(remainingLength);
int omittedProperties = 0;
while (encodedLength > context.getMaximumPacketSize()) {
omittedProperties++;
propertyLength = propertyLength(message, propertyLength, omittedProperties);
if (propertyLength < 0) {
throw maximumPacketSizeExceeded(message, encodedLength, context.getMaximumPacketSize());
}
remainingLength = remainingLength(remainingLengthWithoutProperties, propertyLength, willPropertyLength);
encodedLength = encodedPacketLength(remainingLength);
}
return encode(message, context, encodedLength, remainingLength, propertyLength, willPropertyLength,
omittedProperties);
}
private @NotNull ByteBuf encode(
final @NotNull MqttStatefulConnect message,
final @NotNull MqttEncoderContext context,
final int encodedLength,
final int remainingLength,
final int propertyLength,
final int willPropertyLength,
final int omittedProperties) {
final ByteBuf out = context.getAllocator().ioBuffer(encodedLength, encodedLength);
encode(message, out, remainingLength, propertyLength, willPropertyLength, omittedProperties);
return out;
}
private int remainingLength(
final int remainingLengthWithoutProperties, final int propertyLength, final int willPropertyLength) {
return remainingLengthWithoutProperties + encodedLengthWithHeader(propertyLength) +
((willPropertyLength == -1) ? 0 : encodedLengthWithHeader(willPropertyLength));
}
private int remainingLengthWithoutProperties(final @NotNull MqttStatefulConnect message) {
final MqttConnect stateless = message.stateless();
int remainingLength = VARIABLE_HEADER_FIXED_LENGTH;
remainingLength += message.getClientIdentifier().encodedLength();
final MqttSimpleAuth simpleAuth = stateless.getRawSimpleAuth();
if (simpleAuth != null) {
remainingLength += nullableEncodedLength(simpleAuth.getRawUsername());
remainingLength += nullableEncodedLength(simpleAuth.getRawPassword());
}
final MqttWillPublish willPublish = stateless.getRawWillPublish();
if (willPublish != null) {
remainingLength += willPublish.getTopic().encodedLength();
remainingLength += encodedOrEmptyLength(willPublish.getRawPayload());
}
return remainingLength;
}
private int propertyLength(final @NotNull MqttStatefulConnect message) {
final MqttConnect stateless = message.stateless();
int propertyLength = 0;
propertyLength +=
intPropertyEncodedLength(stateless.getSessionExpiryInterval(), DEFAULT_SESSION_EXPIRY_INTERVAL);
final MqttConnectRestrictions restrictions = stateless.getRestrictions();
if (restrictions != MqttConnectRestrictions.DEFAULT) {
propertyLength += shortPropertyEncodedLength(restrictions.getReceiveMaximum(),
MqttConnectRestrictions.DEFAULT_RECEIVE_MAXIMUM);
propertyLength += intPropertyEncodedLength(restrictions.getMaximumPacketSize(),
MqttConnectRestrictions.DEFAULT_MAXIMUM_PACKET_SIZE);
propertyLength += shortPropertyEncodedLength(restrictions.getTopicAliasMaximum(),
MqttConnectRestrictions.DEFAULT_TOPIC_ALIAS_MAXIMUM);
propertyLength += booleanPropertyEncodedLength(restrictions.isRequestResponseInformation(),
MqttConnectRestrictions.DEFAULT_REQUEST_RESPONSE_INFORMATION);
propertyLength += booleanPropertyEncodedLength(restrictions.isRequestProblemInformation(),
MqttConnectRestrictions.DEFAULT_REQUEST_PROBLEM_INFORMATION);
}
propertyLength += message.getUserProperties().encodedLength();
final MqttEnhancedAuth enhancedAuth = message.getEnhancedAuth();
if (enhancedAuth != null) {
propertyLength += propertyEncodedLength(enhancedAuth.getMethod());
propertyLength += nullablePropertyEncodedLength(enhancedAuth.getRawData());
}
return propertyLength;
}
private int propertyLength(
final @NotNull MqttStatefulConnect message, final int propertyLength, final int omittedProperties) {
switch (omittedProperties) {
case 0:
return propertyLength;
case 1:
return propertyLength - message.getUserProperties().encodedLength();
default:
return -1;
}
}
private int willPropertyLength(final @NotNull MqttStatefulConnect message) {
final MqttWillPublish willPublish = message.stateless().getRawWillPublish();
if (willPublish == null) {
return -1;
}
int willPropertyLength = publishEncoder.fixedPropertyLength(willPublish);
willPropertyLength += willPublish.getUserProperties().encodedLength();
willPropertyLength +=
intPropertyEncodedLength(willPublish.getDelayInterval(), MqttWillPublish.DEFAULT_DELAY_INTERVAL);
if (!MqttVariableByteInteger.isInRange(willPropertyLength)) {
throw new MqttEncodeException("Will properties exceeded maximum length.");
}
return willPropertyLength;
}
private void encode(
final @NotNull MqttStatefulConnect message,
final @NotNull ByteBuf out,
final int remainingLength,
final int propertyLength,
final int willPropertyLength,
final int omittedProperties) {
encodeFixedHeader(out, remainingLength);
encodeVariableHeader(message, out, propertyLength, omittedProperties);
encodePayload(message, out, willPropertyLength);
}
private void encodeFixedHeader(final @NotNull ByteBuf out, final int remainingLength) {
out.writeByte(FIXED_HEADER);
MqttVariableByteInteger.encode(remainingLength, out);
}
private void encodeVariableHeader(
final @NotNull MqttStatefulConnect message,
final @NotNull ByteBuf out,
final int propertyLength,
final int omittedProperties) {
final MqttConnect stateless = message.stateless();
MqttUtf8StringImpl.PROTOCOL_NAME.encode(out);
out.writeByte(PROTOCOL_VERSION);
int connectFlags = 0;
final MqttSimpleAuth simpleAuth = stateless.getRawSimpleAuth();
if (simpleAuth != null) {
if (simpleAuth.getRawUsername() != null) {
connectFlags |= 0b1000_0000;
}
if (simpleAuth.getRawPassword() != null) {
connectFlags |= 0b0100_0000;
}
}
final MqttWillPublish willPublish = stateless.getRawWillPublish();
if (willPublish != null) {
if (willPublish.isRetain()) {
connectFlags |= 0b0010_0000;
}
connectFlags |= willPublish.getQos().getCode() << 3;
connectFlags |= 0b0000_0100;
}
if (stateless.isCleanStart()) {
connectFlags |= 0b0000_0010;
}
out.writeByte(connectFlags);
out.writeShort(stateless.getKeepAlive());
encodeProperties(message, out, propertyLength, omittedProperties);
}
private void encodeProperties(
final @NotNull MqttStatefulConnect message,
final @NotNull ByteBuf out,
final int propertyLength,
final int omittedProperties) {
final MqttConnect stateless = message.stateless();
MqttVariableByteInteger.encode(propertyLength, out);
encodeIntProperty(
SESSION_EXPIRY_INTERVAL, stateless.getSessionExpiryInterval(), DEFAULT_SESSION_EXPIRY_INTERVAL, out);
final MqttEnhancedAuth enhancedAuth = message.getEnhancedAuth();
if (enhancedAuth != null) {
encodeProperty(AUTHENTICATION_METHOD, enhancedAuth.getMethod(), out);
encodeNullableProperty(AUTHENTICATION_DATA, enhancedAuth.getRawData(), out);
}
final MqttConnectRestrictions restrictions = stateless.getRestrictions();
if (restrictions != MqttConnectRestrictions.DEFAULT) {
encodeShortProperty(RECEIVE_MAXIMUM, restrictions.getReceiveMaximum(),
MqttConnectRestrictions.DEFAULT_RECEIVE_MAXIMUM, out);
encodeIntProperty(MAXIMUM_PACKET_SIZE, restrictions.getMaximumPacketSize(),
MqttConnectRestrictions.DEFAULT_MAXIMUM_PACKET_SIZE, out);
encodeShortProperty(TOPIC_ALIAS_MAXIMUM, restrictions.getTopicAliasMaximum(),
MqttConnectRestrictions.DEFAULT_TOPIC_ALIAS_MAXIMUM, out);
encodeBooleanProperty(REQUEST_RESPONSE_INFORMATION, restrictions.isRequestResponseInformation(),
MqttConnectRestrictions.DEFAULT_REQUEST_RESPONSE_INFORMATION, out);
encodeBooleanProperty(REQUEST_PROBLEM_INFORMATION, restrictions.isRequestProblemInformation(),
MqttConnectRestrictions.DEFAULT_REQUEST_PROBLEM_INFORMATION, out);
}
if (omittedProperties == 0) {
message.getUserProperties().encode(out);
}
}
private void encodePayload(
final @NotNull MqttStatefulConnect message, final @NotNull ByteBuf out, final int willPropertyLength) {
final MqttConnect stateless = message.stateless();
message.getClientIdentifier().encode(out);
encodeWillPublish(stateless, out, willPropertyLength);
final MqttSimpleAuth simpleAuth = stateless.getRawSimpleAuth();
if (simpleAuth != null) {
encodeNullable(simpleAuth.getRawUsername(), out);
encodeNullable(simpleAuth.getRawPassword(), out);
}
}
private void encodeWillPublish(
final @NotNull MqttConnect message, final @NotNull ByteBuf out, final int willPropertyLength) {
final MqttWillPublish willPublish = message.getRawWillPublish();
if (willPublish != null) {
MqttVariableByteInteger.encode(willPropertyLength, out);
publishEncoder.encodeFixedProperties(willPublish, out);
willPublish.getUserProperties().encode(out);
encodeIntProperty(MqttWillPublishProperty.WILL_DELAY_INTERVAL, willPublish.getDelayInterval(),
MqttWillPublish.DEFAULT_DELAY_INTERVAL, out);
willPublish.getTopic().encode(out);
encodeOrEmpty(willPublish.getRawPayload(), out);
}
}
}