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A client library for memcached.

There is a newer version: 2.8.4

package net.spy.memcached.auth;

import javax.security.auth.callback.CallbackHandler;

/**
 * Information required to specify authentication mechanisms and callbacks.
 */
public class AuthDescriptor {

	public final String[] mechs;
	public final CallbackHandler cbh;
	private int authAttempts;
	private int allowedAuthAttempts;

	/**
	 * Request authentication using the given list of mechanisms and callback
	 * handler.
	 *
	 * @param m list of mechanisms
	 * @param h the callback handler for grabbing credentials and stuff
	 */
	public AuthDescriptor(String[] m, CallbackHandler h) {
		mechs=m;
		cbh=h;
                authAttempts = 0;
		String authThreshhold=System.getProperty(
			"net.spy.memcached.auth.AuthThreshold");
		if (authThreshhold != null) {
			allowedAuthAttempts = Integer.parseInt(authThreshhold);
		} else {
			allowedAuthAttempts = -1; // auth forever
		}
	}

	/**
	 * Get a typical auth descriptor for CRAM-MD5 or PLAIN auth with the given
	 * username and password.
	 *
	 * @param u the username
	 * @param p the password
	 *
	 * @return an AuthDescriptor
	 */
	public static AuthDescriptor typical(String u, String p) {
		return new AuthDescriptor(new String[]{"CRAM-MD5", "PLAIN"},
				new PlainCallbackHandler(u, p));
	}

	public boolean authThresholdReached() {
		if (allowedAuthAttempts < 0) {
			return false; // negative value means auth forever
		} else if (authAttempts >= allowedAuthAttempts) {
			return true;
		} else {
			authAttempts++;
			return false;
		}
	}
}