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SCRAM messages have an optional extensions field which is a comma-separated list of key=value pairs.
After KIP-84 implementation , an extension will be added to the first client SCRAM message to indicate
that authentication is being requested for a delegation token. This will enable Kafka broker to obtain
credentials and principal using a different code path for delegation tokens.

DelegationToken Client

public class DelegationClient  {

    public TokenDetails generateToken(List<String> renewers, long maxLifeTime);

    public boolean renewToken(bytes[] hmac,  long expiryTime);

    public boolean expireToken(bytes[] hmac, long expireTimeStamp);

    public boolean invalidateToken(bytes[] hmac);

    public void close();

}

Command line tool

 We will provide a CLI to acquire delegation tokens, renew tokens and to invalidate/expire tokens. 

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