public void ProcessPubrec(Int32 packetID)
{
_timers.Remove(packetID);
if (_listener != null)
{
_listener.MessageReceived(MessageType.PUBREC);
}
MQMessage message = new Pubrel(packetID);
_timers.Store(message);
_client.Send(message);
}
/// <exception cref="MalformedMessageException">Exception is thrown in case of invalid packet format</exception>
public static MQMessage Decode(IByteBuffer buf)
{
MQMessage header = null;
byte fixedHeader = buf.ReadByte();
LengthDetails length = DecodeLength(buf);
MessageType type = (MessageType)((fixedHeader >> 4) & 0xf);
switch (type)
{
case MessageType.CONNECT:
Byte[] nameValue = new byte[buf.ReadUnsignedShort()];
buf.ReadBytes(nameValue, 0, nameValue.Length);
String name = Encoding.UTF8.GetString(nameValue);
if (!name.Equals(Connect.PROTOCOL_NAME))
{
throw new MalformedMessageException("CONNECT, protocol-name set to " + name);
}
Byte protocolLevel = buf.ReadByte();
Byte contentFlags = buf.ReadByte();
Boolean userNameFlag = (((contentFlags >> 7) & 1) == 1) ? true : false;
Boolean userPassFlag = (((contentFlags >> 6) & 1) == 1) ? true : false;
Boolean willRetain = (((contentFlags >> 5) & 1) == 1) ? true : false;
Int32 QOSValue = ((contentFlags & 0x1f) >> 3) & 3;
QOS willQos = (QOS)QOSValue;
if (!Enum.IsDefined(typeof(QOS), QOSValue))
{
throw new MalformedMessageException("CONNECT, will QoS set to " + willQos);
}
Boolean willFlag = (((contentFlags >> 2) & 1) == 1) ? true : false;
if (willQos != QOS.AT_MOST_ONCE && !willFlag)
{
throw new MalformedMessageException("CONNECT, will QoS set to " + willQos + ", willFlag not set");
}
if (willRetain && !willFlag)
{
throw new MalformedMessageException("CONNECT, will retain set, willFlag not set");
}
Boolean cleanSession = (((contentFlags >> 1) & 1) == 1) ? true : false;
Boolean reservedFlag = ((contentFlags & 1) == 1) ? true : false;
if (reservedFlag)
{
throw new MalformedMessageException("CONNECT, reserved flag set to true");
}
int keepalive = buf.ReadUnsignedShort();
Byte[] clientIdValue = new byte[buf.ReadUnsignedShort()];
buf.ReadBytes(clientIdValue, 0, clientIdValue.Length);
String clientID = Encoding.UTF8.GetString(clientIdValue);
if (!StringVerifier.verify(clientID))
{
throw new MalformedMessageException("ClientID contains restricted characters: U+0000, U+D000-U+DFFF");
}
String willTopic = null;
Byte[] willMessage = null;
String username = null;
String password = null;
Will will = null;
if (willFlag)
{
if (buf.ReadableBytes < 2)
{
throw new MalformedMessageException("Invalid encoding will/username/password");
}
byte[] willTopicValue = new byte[buf.ReadUnsignedShort()];
if (buf.ReadableBytes < willTopicValue.Length)
{
throw new MalformedMessageException("Invalid encoding will/username/password");
}
buf.ReadBytes(willTopicValue, 0, willTopicValue.Length);
willTopic = Encoding.UTF8.GetString(willTopicValue);
if (!StringVerifier.verify(willTopic))
{
throw new MalformedMessageException("WillTopic contains one or more restricted characters: U+0000, U+D000-U+DFFF");
}
if (buf.ReadableBytes < 2)
{
throw new MalformedMessageException("Invalid encoding will/username/password");
}
willMessage = new byte[buf.ReadUnsignedShort()];
if (buf.ReadableBytes < willMessage.Length)
{
throw new MalformedMessageException("Invalid encoding will/username/password");
}
buf.ReadBytes(willMessage, 0, willMessage.Length);
if (willTopic.Length == 0)
{
throw new MalformedMessageException("invalid will encoding");
}
will = new Will(new Topic(willTopic, willQos), willMessage, willRetain);
if (!will.IsValid())
{
throw new MalformedMessageException("invalid will encoding");
}
}
if (userNameFlag)
{
if (buf.ReadableBytes < 2)
{
throw new MalformedMessageException("Invalid encoding will/username/password");
}
byte[] userNameValue = new byte[buf.ReadUnsignedShort()];
if (buf.ReadableBytes < userNameValue.Length)
{
throw new MalformedMessageException("Invalid encoding will/username/password");
}
buf.ReadBytes(userNameValue, 0, userNameValue.Length);
username = Encoding.UTF8.GetString(userNameValue);
if (!StringVerifier.verify(username))
{
throw new MalformedMessageException("Username contains one or more restricted characters: U+0000, U+D000-U+DFFF");
}
}
if (userPassFlag)
{
if (buf.ReadableBytes < 2)
{
throw new MalformedMessageException("Invalid encoding will/username/password");
}
byte[] userPassValue = new byte[buf.ReadUnsignedShort()];
if (buf.ReadableBytes < userPassValue.Length)
{
throw new MalformedMessageException("Invalid encoding will/username/password");
}
buf.ReadBytes(userPassValue, 0, userPassValue.Length);
password = Encoding.UTF8.GetString(userPassValue);
if (!StringVerifier.verify(password))
{
throw new MalformedMessageException("Password contains one or more restricted characters: U+0000, U+D000-U+DFFF");
}
}
if (buf.ReadableBytes > 0)
{
throw new MalformedMessageException("Invalid encoding will/username/password");
}
Connect connect = new Connect(username, password, clientID, cleanSession, keepalive, will);
if (protocolLevel != 4)
{
connect.ProtocolLevel = protocolLevel;
}
header = connect;
break;
case MessageType.CONNACK:
byte sessionPresentValue = buf.ReadByte();
if (sessionPresentValue != 0 && sessionPresentValue != 1)
{
throw new MalformedMessageException("CONNACK, session-present set to " + (sessionPresentValue & 0xff));
}
Boolean isPresent = sessionPresentValue == 1 ? true : false;
Int32 connackByte = ((Int32)buf.ReadByte()) & 0xFF;
ConnackCode connackCode = (ConnackCode)connackByte;
if (!Enum.IsDefined(typeof(ConnackCode), connackByte))
{
throw new MalformedMessageException("Invalid connack code: " + connackByte);
}
header = new Connack(isPresent, connackCode);
break;
case MessageType.PUBLISH:
int dataLength = length.Length;
fixedHeader &= 0xf;
Boolean dup = (((fixedHeader >> 3) & 1) == 1) ? true : false;
QOSValue = (fixedHeader & 0x07) >> 1;
QOS qos = (QOS)QOSValue;
if (!Enum.IsDefined(typeof(QOS), (byte)QOSValue))
{
throw new MalformedMessageException("invalid QoS value");
}
if (dup && qos == QOS.AT_MOST_ONCE)
{
throw new MalformedMessageException("PUBLISH, QoS-0 dup flag present");
}
Boolean retain = ((fixedHeader & 1) == 1) ? true : false;
byte[] topicNameValue = new byte[buf.ReadUnsignedShort()];
buf.ReadBytes(topicNameValue, 0, topicNameValue.Length);
String topicName = Encoding.UTF8.GetString(topicNameValue);
if (!StringVerifier.verify(topicName))
{
throw new MalformedMessageException("Publish-topic contains one or more restricted characters: U+0000, U+D000-U+DFFF");
}
dataLength -= topicName.Length + 2;
Int32?packetID = null;
if (qos != QOS.AT_MOST_ONCE)
{
packetID = buf.ReadUnsignedShort();
if (packetID < 0 || packetID > 65535)
{
throw new MalformedMessageException("Invalid PUBLISH packetID encoding");
}
dataLength -= 2;
}
byte[] data = new byte[dataLength];
if (dataLength > 0)
{
buf.ReadBytes(data, 0, data.Length);
}
header = new Publish(packetID, new Topic(topicName, qos), data, retain, dup);
break;
case MessageType.PUBACK:
header = new Puback(buf.ReadUnsignedShort());
break;
case MessageType.PUBREC:
header = new Pubrec(buf.ReadUnsignedShort());
break;
case MessageType.PUBREL:
header = new Pubrel(buf.ReadUnsignedShort());
break;
case MessageType.PUBCOMP:
header = new Pubcomp(buf.ReadUnsignedShort());
break;
case MessageType.SUBSCRIBE:
Int32 subID = buf.ReadUnsignedShort();
List <Topic> subscriptions = new List <Topic>();
while (buf.IsReadable())
{
byte[] value = new byte[buf.ReadUnsignedShort()];
buf.ReadBytes(value, 0, value.Length);
QOSValue = buf.ReadByte();
QOS requestedQos = (QOS)QOSValue;
if (!Enum.IsDefined(typeof(QOS), QOSValue))
{
throw new MalformedMessageException("Subscribe qos must be in range from 0 to 2: " + requestedQos);
}
String topic = Encoding.UTF8.GetString(value);
if (!StringVerifier.verify(topic))
{
throw new MalformedMessageException("Subscribe topic contains one or more restricted characters: U+0000, U+D000-U+DFFF");
}
Topic subscription = new Topic(topic, requestedQos);
subscriptions.Add(subscription);
}
if (subscriptions.Count == 0)
{
throw new MalformedMessageException("Subscribe with 0 topics");
}
header = new Subscribe(subID, subscriptions.ToArray());
break;
case MessageType.SUBACK:
Int32 subackID = buf.ReadUnsignedShort();
List <SubackCode> subackCodes = new List <SubackCode>();
while (buf.IsReadable())
{
Int32 subackByte = ((Int32)buf.ReadByte()) & 0xFF;
SubackCode subackCode = (SubackCode)subackByte;
if (!Enum.IsDefined(typeof(SubackCode), subackByte))
{
throw new MalformedMessageException("Invalid suback code: " + subackByte);
}
subackCodes.Add(subackCode);
}
if (subackCodes.Count == 0)
{
throw new MalformedMessageException("Suback with 0 return-codes");
}
header = new Suback(subackID, subackCodes);
break;
case MessageType.UNSUBSCRIBE:
Int32 unsubID = buf.ReadUnsignedShort();
List <String> unsubscribeTopics = new List <String>();
while (buf.IsReadable())
{
byte[] value = new byte[buf.ReadUnsignedShort()];
buf.ReadBytes(value, 0, value.Length);
String topic = Encoding.UTF8.GetString(value);
if (!StringVerifier.verify(topic))
{
throw new MalformedMessageException("Unsubscribe topic contains one or more restricted characters: U+0000, U+D000-U+DFFF");
}
unsubscribeTopics.Add(topic);
}
if (unsubscribeTopics.Count == 0)
{
throw new MalformedMessageException("Unsubscribe with 0 topics");
}
header = new Unsubscribe(unsubID, unsubscribeTopics.ToArray());
break;
case MessageType.UNSUBACK:
header = new Unsuback(buf.ReadUnsignedShort());
break;
case MessageType.PINGREQ:
header = new Pingreq();
break;
case MessageType.PINGRESP:
header = new Pingresp();
break;
case MessageType.DISCONNECT:
header = new Disconnect();
break;
default:
throw new MalformedMessageException("Invalid header type: " + type);
}
if (buf.IsReadable())
{
throw new MalformedMessageException("unexpected bytes in content");
}
if (length.Length != header.GetLength())
{
throw new MalformedMessageException("Invalid length. Encoded: " + length.Length + ", actual: " + header.GetLength());
}
return(header);
}
/// <exception cref="MalformedMessageException">Exception is thrown in case of invalid packet format</exception>
public static IByteBuffer encode(MQMessage header)
{
int length = header.GetLength();
IByteBuffer buf = GetBuffer(length);
MessageType type = header.MessageType;
switch (type)
{
case MessageType.CONNECT:
Connect connect = (Connect)header;
if (connect.Will != null && !connect.Will.IsValid())
{
throw new MalformedMessageException("invalid will encoding");
}
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteShort(Connect.DEFAULT_PROTOCOL_LEVEL);
buf.WriteBytes(Encoding.UTF8.GetBytes(connect.Name));
buf.WriteByte(connect.ProtocolLevel);
byte contentFlags = 0;
if (connect.CleanSession)
{
contentFlags += 0x02;
}
if (connect.Will != null)
{
contentFlags += 0x04;
contentFlags += (byte)(((Int32)connect.Will.Topic.Qos) << 3);
if (connect.Will.Retain)
{
contentFlags += 0x20;
}
}
if (connect.Username != null)
{
contentFlags += 0x40;
}
if (connect.Password != null)
{
contentFlags += 0x80;
}
buf.WriteByte(contentFlags);
buf.WriteShort(connect.Keepalive);
buf.WriteShort(connect.ClientID.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(connect.ClientID));
if (connect.Will != null)
{
String willTopic = connect.Will.Topic.Name;
if (willTopic != null)
{
buf.WriteShort(willTopic.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(willTopic));
}
byte[] willMessage = connect.Will.Content;
if (willMessage != null)
{
buf.WriteShort(willMessage.Length);
buf.WriteBytes(willMessage);
}
}
String username = connect.Username;
if (username != null)
{
buf.WriteShort(username.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(username));
}
String password = connect.Password;
if (password != null)
{
buf.WriteShort(password.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(password));
}
break;
case MessageType.CONNACK:
Connack connack = (Connack)header;
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteBoolean(connack.SessionPresent);
buf.WriteByte((Int32)connack.ReturnCode);
break;
case MessageType.PUBLISH:
Publish publish = (Publish)header;
byte firstByte = (byte)(((Int32)type) << 4);
if (publish.Dup)
{
firstByte += 0x08;
}
firstByte += (byte)(((Int32)publish.Topic.Qos) << 1);
if (publish.Retain)
{
firstByte += 0x01;
}
buf.SetByte(0, firstByte);
buf.WriteShort(publish.Topic.Name.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(publish.Topic.Name));
if (publish.PacketID.HasValue)
{
buf.WriteShort(publish.PacketID.Value);
}
buf.WriteBytes(publish.Content);
break;
case MessageType.PUBACK:
Puback puback = (Puback)header;
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteShort(puback.PacketID.Value);
break;
case MessageType.PUBREC:
Pubrec pubrec = (Pubrec)header;
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteShort(pubrec.PacketID.Value);
break;
case MessageType.PUBREL:
Pubrel pubrel = (Pubrel)header;
buf.SetByte(0, (byte)((((Int32)type) << 4) | 0x2));
buf.WriteShort(pubrel.PacketID.Value);
break;
case MessageType.PUBCOMP:
Pubcomp pubcomp = (Pubcomp)header;
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteShort(pubcomp.PacketID.Value);
break;
case MessageType.SUBSCRIBE:
Subscribe sub = (Subscribe)header;
buf.SetByte(0, (byte)((((Int32)type) << 4) | 0x2));
buf.WriteShort(sub.PacketID.Value);
foreach (Topic subscription in sub.Topics)
{
buf.WriteShort(subscription.Name.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(subscription.Name));
buf.WriteByte((Int32)subscription.Qos);
}
break;
case MessageType.SUBACK:
Suback suback = (Suback)header;
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteShort(suback.PacketID.Value);
foreach (SubackCode code in suback.ReturnCodes)
{
buf.WriteByte((Int32)code);
}
break;
case MessageType.UNSUBSCRIBE:
Unsubscribe unsub = (Unsubscribe)header;
buf.SetByte(0, (byte)((((Int32)type) << 4) | 0x2));
buf.WriteShort(unsub.PacketID.Value);
foreach (String topic in unsub.Topics)
{
buf.WriteShort(topic.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(topic));
}
break;
case MessageType.UNSUBACK:
Unsuback unsuback = (Unsuback)header;
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteShort(unsuback.PacketID.Value);
break;
case MessageType.DISCONNECT:
case MessageType.PINGREQ:
case MessageType.PINGRESP:
buf.SetByte(0, (byte)(((Int32)type) << 4));
break;
default:
throw new MalformedMessageException("Invalid header type: " + type);
}
return(buf);
}