private static MqttBasePacket DecodeUnsubscribePacket(IMqttPacketBodyReader body)
{
ThrowIfBodyIsEmpty(body);
var packet = new MqttUnsubscribePacket
{
PacketIdentifier = body.ReadTwoByteInteger(),
Properties = new MqttUnsubscribePacketProperties()
};
var propertiesReader = new MqttV500PropertiesReader(body);
while (propertiesReader.MoveNext())
{
if (propertiesReader.CurrentPropertyId == MqttPropertyId.UserProperty)
{
propertiesReader.FillUserProperties(packet.Properties.UserProperties);
}
else
{
propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttUnsubscribePacket));
}
}
while (!body.EndOfStream)
{
packet.TopicFilters.Add(body.ReadStringWithLengthPrefix());
}
return(packet);
}
private static MqttBasePacket DecodeSubscribePacket(IMqttPacketBodyReader body)
{
ThrowIfBodyIsEmpty(body);
var packet = new MqttSubscribePacket
{
PacketIdentifier = body.ReadTwoByteInteger(),
Properties = new MqttSubscribePacketProperties()
};
var propertiesReader = new MqttV500PropertiesReader(body);
while (propertiesReader.MoveNext())
{
if (propertiesReader.CurrentPropertyId == MqttPropertyId.SubscriptionIdentifier)
{
packet.Properties.SubscriptionIdentifier = propertiesReader.ReadSubscriptionIdentifier();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.UserProperty)
{
propertiesReader.FillUserProperties(packet.Properties.UserProperties);
}
else
{
propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttSubscribePacket));
}
}
while (!body.EndOfStream)
{
var topic = body.ReadStringWithLengthPrefix();
var options = body.ReadByte();
var qos = (MqttQualityOfServiceLevel)(options & 3);
var noLocal = (options & (1 << 2)) > 0;
var retainAsPublished = (options & (1 << 3)) > 0;
var retainHandling = (MqttRetainHandling)((options >> 4) & 3);
packet.TopicFilters.Add(new TopicFilter
{
Topic = topic,
QualityOfServiceLevel = qos,
NoLocal = noLocal,
RetainAsPublished = retainAsPublished,
RetainHandling = retainHandling
});
}
return(packet);
}
private static MqttBasePacket DecodeAuthPacket(IMqttPacketBodyReader body)
{
ThrowIfBodyIsEmpty(body);
var packet = new MqttAuthPacket
{
Properties = new MqttAuthPacketProperties()
};
if (body.EndOfStream)
{
packet.ReasonCode = MqttAuthenticateReasonCode.Success;
return(packet);
}
packet.ReasonCode = (MqttAuthenticateReasonCode)body.ReadByte();
var propertiesReader = new MqttV500PropertiesReader(body);
while (propertiesReader.MoveNext())
{
if (propertiesReader.CurrentPropertyId == MqttPropertyId.AuthenticationMethod)
{
packet.Properties.AuthenticationMethod = propertiesReader.ReadAuthenticationMethod();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AuthenticationData)
{
packet.Properties.AuthenticationData = propertiesReader.ReadAuthenticationData();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ReasonString)
{
packet.Properties.ReasonString = propertiesReader.ReadReasonString();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.UserProperty)
{
propertiesReader.FillUserProperties(packet.Properties.UserProperties);
}
else
{
propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttAuthPacket));
}
}
return(packet);
}
private static MqttBasePacket DecodePubCompPacket(IMqttPacketBodyReader body)
{
ThrowIfBodyIsEmpty(body);
var packet = new MqttPubCompPacket
{
PacketIdentifier = body.ReadTwoByteInteger(),
Properties = new MqttPubCompPacketProperties()
};
if (body.EndOfStream)
{
packet.ReasonCode = MqttPubCompReasonCode.Success;
return(packet);
}
packet.ReasonCode = (MqttPubCompReasonCode)body.ReadByte();
var propertiesReader = new MqttV500PropertiesReader(body);
while (propertiesReader.MoveNext())
{
if (propertiesReader.CurrentPropertyId == MqttPropertyId.ReasonString)
{
packet.Properties.ReasonString = propertiesReader.ReadReasonString();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.UserProperty)
{
propertiesReader.FillUserProperties(packet.Properties.UserProperties);
}
else
{
propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttPubCompPacket));
}
}
return(packet);
}
private static MqttBasePacket DecodeDisconnectPacket(IMqttPacketBodyReader body)
{
ThrowIfBodyIsEmpty(body);
var packet = new MqttDisconnectPacket
{
ReasonCode = (MqttDisconnectReasonCode)body.ReadByte(),
Properties = new MqttDisconnectPacketProperties()
};
var propertiesReader = new MqttV500PropertiesReader(body);
while (propertiesReader.MoveNext())
{
if (propertiesReader.CurrentPropertyId == MqttPropertyId.SessionExpiryInterval)
{
packet.Properties.SessionExpiryInterval = propertiesReader.ReadSessionExpiryInterval();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ReasonString)
{
packet.Properties.ReasonString = propertiesReader.ReadReasonString();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ServerReference)
{
packet.Properties.ServerReference = propertiesReader.ReadServerReference();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.UserProperty)
{
propertiesReader.FillUserProperties(packet.Properties.UserProperties);
}
else
{
propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttDisconnectPacket));
}
}
return(packet);
}
private static MqttBasePacket DecodeConnectPacket(IMqttPacketBodyReader body)
{
ThrowIfBodyIsEmpty(body);
var packet = new MqttConnectPacket
{
Properties = new MqttConnectPacketProperties()
};
var protocolName = body.ReadStringWithLengthPrefix();
var protocolVersion = body.ReadByte();
if (protocolName != "MQTT" && protocolVersion != 5)
{
throw new MqttProtocolViolationException("MQTT protocol name and version do not match MQTT v5.");
}
var connectFlags = body.ReadByte();
var cleanSessionFlag = (connectFlags & 0x02) > 0;
var willMessageFlag = (connectFlags & 0x04) > 0;
var willMessageQoS = (byte)(connectFlags >> 3 & 3);
var willMessageRetainFlag = (connectFlags & 0x20) > 0;
var passwordFlag = (connectFlags & 0x40) > 0;
var usernameFlag = (connectFlags & 0x80) > 0;
packet.CleanSession = cleanSessionFlag;
if (willMessageFlag)
{
packet.WillMessage = new MqttApplicationMessage
{
QualityOfServiceLevel = (MqttQualityOfServiceLevel)willMessageQoS,
Retain = willMessageRetainFlag
};
}
packet.KeepAlivePeriod = body.ReadTwoByteInteger();
var propertiesReader = new MqttV500PropertiesReader(body);
while (propertiesReader.MoveNext())
{
if (propertiesReader.CurrentPropertyId == MqttPropertyId.SessionExpiryInterval)
{
packet.Properties.SessionExpiryInterval = propertiesReader.ReadSessionExpiryInterval();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AuthenticationMethod)
{
packet.Properties.AuthenticationMethod = propertiesReader.ReadAuthenticationMethod();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.WillDelayInterval)
{
packet.Properties.WillDelayInterval = propertiesReader.ReadWillDelayInterval();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AuthenticationData)
{
packet.Properties.AuthenticationData = propertiesReader.ReadAuthenticationData();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ReceiveMaximum)
{
packet.Properties.ReceiveMaximum = propertiesReader.ReadReceiveMaximum();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.TopicAliasMaximum)
{
packet.Properties.TopicAliasMaximum = propertiesReader.ReadTopicAliasMaximum();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.MaximumPacketSize)
{
packet.Properties.MaximumPacketSize = propertiesReader.ReadMaximumPacketSize();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.RequestResponseInformation)
{
packet.Properties.RequestResponseInformation = propertiesReader.RequestResponseInformation();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.RequestProblemInformation)
{
packet.Properties.RequestProblemInformation = propertiesReader.RequestProblemInformation();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.UserProperty)
{
propertiesReader.FillUserProperties(packet.Properties.UserProperties);
}
else
{
propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttConnAckPacket));
}
}
packet.ClientId = body.ReadStringWithLengthPrefix();
if (packet.WillMessage != null)
{
packet.WillMessage.Topic = body.ReadStringWithLengthPrefix();
packet.WillMessage.Payload = body.ReadWithLengthPrefix();
}
if (usernameFlag)
{
packet.Username = body.ReadStringWithLengthPrefix();
}
if (passwordFlag)
{
packet.Password = body.ReadStringWithLengthPrefix();
}
return(packet);
}
private static MqttBasePacket DecodePublishPacket(byte header, IMqttPacketBodyReader body)
{
ThrowIfBodyIsEmpty(body);
var retain = (header & 1) > 0;
var qos = (MqttQualityOfServiceLevel)(header >> 1 & 3);
var dup = (header >> 3 & 1) > 0;
var packet = new MqttPublishPacket
{
Topic = body.ReadStringWithLengthPrefix(),
Retain = retain,
QualityOfServiceLevel = qos,
Dup = dup,
Properties = new MqttPublishPacketProperties()
};
if (qos > 0)
{
packet.PacketIdentifier = body.ReadTwoByteInteger();
}
var propertiesReader = new MqttV500PropertiesReader(body);
while (propertiesReader.MoveNext())
{
if (propertiesReader.CurrentPropertyId == MqttPropertyId.PayloadFormatIndicator)
{
packet.Properties.PayloadFormatIndicator = propertiesReader.ReadPayloadFormatIndicator();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.MessageExpiryInterval)
{
packet.Properties.MessageExpiryInterval = propertiesReader.ReadMessageExpiryInterval();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.TopicAlias)
{
packet.Properties.TopicAlias = propertiesReader.ReadTopicAlias();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ResponseTopic)
{
packet.Properties.ResponseTopic = propertiesReader.ReadResponseTopic();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.CorrelationData)
{
packet.Properties.CorrelationData = propertiesReader.ReadCorrelationData();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.SubscriptionIdentifier)
{
packet.Properties.SubscriptionIdentifier = propertiesReader.ReadSubscriptionIdentifier();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ContentType)
{
packet.Properties.ContentType = propertiesReader.ReadContentType();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.UserProperty)
{
propertiesReader.FillUserProperties(packet.Properties.UserProperties);
}
else
{
propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttPublishPacket));
}
}
if (!body.EndOfStream)
{
packet.Payload = body.ReadRemainingData().ToArray();
}
return(packet);
}
private static MqttBasePacket DecodeConnAckPacket(IMqttPacketBodyReader body)
{
ThrowIfBodyIsEmpty(body);
var acknowledgeFlags = body.ReadByte();
var packet = new MqttConnAckPacket
{
IsSessionPresent = (acknowledgeFlags & 0x1) > 0,
ReasonCode = (MqttConnectReasonCode)body.ReadByte(),
Properties = new MqttConnAckPacketProperties()
};
var propertiesReader = new MqttV500PropertiesReader(body);
while (propertiesReader.MoveNext())
{
if (propertiesReader.CurrentPropertyId == MqttPropertyId.SessionExpiryInterval)
{
packet.Properties.SessionExpiryInterval = propertiesReader.ReadSessionExpiryInterval();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AuthenticationMethod)
{
packet.Properties.AuthenticationMethod = propertiesReader.ReadAuthenticationMethod();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AuthenticationData)
{
packet.Properties.AuthenticationData = propertiesReader.ReadAuthenticationData();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.RetainAvailable)
{
packet.Properties.RetainAvailable = propertiesReader.ReadRetainAvailable();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ReceiveMaximum)
{
packet.Properties.ReceiveMaximum = propertiesReader.ReadReceiveMaximum();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.AssignedClientIdentifer)
{
packet.Properties.AssignedClientIdentifier = propertiesReader.ReadAssignedClientIdentifier();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.TopicAliasMaximum)
{
packet.Properties.TopicAliasMaximum = propertiesReader.ReadTopicAliasMaximum();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ReasonString)
{
packet.Properties.ReasonString = propertiesReader.ReadReasonString();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.MaximumPacketSize)
{
packet.Properties.MaximumPacketSize = propertiesReader.ReadMaximumPacketSize();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.WildcardSubscriptionAvailable)
{
packet.Properties.WildcardSubscriptionAvailable = propertiesReader.ReadWildcardSubscriptionAvailable();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.SubscriptionIdentifiersAvailable)
{
packet.Properties.SubscriptionIdentifiersAvailable = propertiesReader.ReadSubscriptionIdentifiersAvailable();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.SharedSubscriptionAvailable)
{
packet.Properties.SharedSubscriptionAvailable = propertiesReader.ReadSharedSubscriptionAvailable();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ServerKeepAlive)
{
packet.Properties.ServerKeepAlive = propertiesReader.ReadServerKeepAlive();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ResponseInformation)
{
packet.Properties.ResponseInformation = propertiesReader.ReadResponseInformation();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.ServerReference)
{
packet.Properties.ServerReference = propertiesReader.ReadServerReference();
}
else if (propertiesReader.CurrentPropertyId == MqttPropertyId.UserProperty)
{
propertiesReader.FillUserProperties(packet.Properties.UserProperties);
}
else
{
propertiesReader.ThrowInvalidPropertyIdException(typeof(MqttConnAckPacket));
}
}
return(packet);
}
