Protocol

Encoding

PluginQuery uses BigEndian. Both sender and receiver must have the same encryption and compression method. Otherwise, it will be rejected as a corrupted packet.

Type	Length
Byte	1 Byte
Long	8 Byte
Integer	4 Byte
Byte Array	Max. 4 GigaByte

Handshaking

Handshaking is required to make a connection between servers. Handshaking used to make sure that you're trying to send and receive query messages. It also used to check the compression and encryption method on client and server. Once the client and the server handshaken, the client doesn't have to send a handshake packet again, except if the client disconnects from the server.

Request Packet

Type	Description	Value
Byte	Length of PluginQuery protocol name	5
Byte Array	PluginQuery protocol name (Maximum Length: 127)	query
Long	Most Significant Bits (UUID)
Long	Least Significant Bits (UUID)
Byte	Length of Encrypted Stringified UUID
Byte Array	Encrypted Stringified UUID (Maximum Length: 127)

/***
 * Generate UUID to String
 * @param mostSigBits
 * @param leastSigBits
 * @return Stringified UUID
 */
public static String UUIDtoString(long mostSigBits, long leastSigBits) {
    return (digits(mostSigBits >> 32, 8) + "-" +
            digits(mostSigBits >> 16, 4) + "-" +
            digits(mostSigBits, 4) + "-" +
            digits(leastSigBits >> 48, 4) + "-" +
            digits(leastSigBits, 12));
}

private static String digits(long val, int digits) {
    long hi = 1L << (digits * 4);
    return Long.toHexString(hi | (val & (hi - 1))).substring(1);
}

Sending Query Message

Query Messages are compressed and encrypted. You need to know the compression algorithm and the encryption key in order to encode the packet. Decompression and Decryption are happening before the packet decoded.

Type	Description
Byte	Channel name length
Byte Array	Channel name (Maximum Length: 127)
Integer	Message length
Byte Array	Query Message (Maximum Length: 4 Giga)

Pipeline

Inbound

Order
Decrypt
Decompress
Decode

Outbound

Order
Encode
Compress
Encrypt