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A Shaded CQL ActivityType driver for http://nosqlbench.io/

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/*
 * Copyright DataStax, Inc.
 *
 * This software can be used solely with DataStax Enterprise. Please consult the license at
 * http://www.datastax.com/terms/datastax-dse-driver-license-terms
 */
package com.datastax.driver.dse.auth;

import com.datastax.driver.core.Authenticator;

/**
 * Base class for {@link Authenticator} implementations that want to make use of the authentication
 * scheme negotiation in the DseAuthenticator
 */
abstract class BaseDseAuthenticator implements Authenticator {
  private static final String DSE_AUTHENTICATOR =
      "com.datastax.bdp.cassandra.auth.DseAuthenticator";
  private final String authenticator;

  protected BaseDseAuthenticator(String authenticator) {
    this.authenticator = authenticator;
  }

  /**
   * Return a byte array containing the required SASL mechanism. This should be one of:
   *
   * 
   *   "PLAIN".getBytes(Charsets.UTF_8);
   *   
"GSSAPI".getBytes(Charsets.UTF_8);
   * 
   *
   * @return a byte array containing the SASL mechanism
   */
  public abstract byte[] getMechanism();

  /**
   * Return a byte array containing the expected successful server challenge. This should be one of:
   *
   * 
   *   "PLAIN-START".getBytes(Charsets.UTF_8);
   *   
"GSSAPI-START".getBytes(Charsets.UTF_8);
   * 
   *
   * @return a byte array containing the server challenge
   */
  public abstract byte[] getInitialServerChallenge();

  public byte[] initialResponse() {
    if (isDseAuthenticator()) return getMechanism();
    else return evaluateChallenge(getInitialServerChallenge());
  }

  public void onAuthenticationSuccess(byte[] token) {}

  private boolean isDseAuthenticator() {
    return authenticator.equals(DSE_AUTHENTICATOR);
  }
}