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A pure-java CIFS/SMB client library
There is a newer version: 2.1.10
/* jcifs smb client library in Java
 * Copyright (C) 2002  "Michael B. Allen" 
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.smb;


/**
 * This class can be extended by applications that wish to trap authentication related exceptions and automatically
 * retry the exceptional operation with different credentials. Read jCIFS Exceptions
 * and NtlmAuthenticator for complete details.
 */

public abstract class NtlmAuthenticator {

    private static NtlmAuthenticator auth;

    private String url;
    private SmbAuthException sae;


    /**
     * Set the default NtlmAuthenticator. Once the default authenticator is set it cannot be changed. Calling
     * this metho again will have no effect.
     * 
     * @param a
     */

    public synchronized static void setDefault ( NtlmAuthenticator a ) {
        if ( auth != null ) {
            return;
        }
        auth = a;
    }


    /**
     * 
     * @return the default authentiucation credentials
     */
    public static NtlmAuthenticator getDefault () {
        return auth;
    }


    protected final String getRequestingURL () {
        return this.url;
    }


    protected final SmbAuthException getRequestingException () {
        return this.sae;
    }


    /**
     * Used internally by jCIFS when an SmbAuthException is trapped to retrieve new user credentials.
     * 
     * @param url
     * @param sae
     * @return credentials returned by prompt
     */
    public static NtlmPasswordAuthenticator requestNtlmPasswordAuthentication ( String url, SmbAuthException sae ) {
        return requestNtlmPasswordAuthentication(auth, url, sae);
    }


    /**
     * @param a
     * @param url
     * @param sae
     * @return credentials returned by prompt
     */
    public static NtlmPasswordAuthenticator requestNtlmPasswordAuthentication ( NtlmAuthenticator a, String url, SmbAuthException sae ) {
        if ( a == null ) {
            return null;
        }
        synchronized ( a ) {
            a.url = url;
            a.sae = sae;
            return a.getNtlmPasswordAuthentication();
        }
    }


    /**
     * An application extending this class must provide an implementation for this method that returns new user
     * credentials try try when accessing SMB resources described by the getRequestingURL and
     * getRequestingException methods.
     * If this method returns null the SmbAuthException that triggered the authenticator check will
     * simply be rethrown. The default implementation returns null.
     */
    protected NtlmPasswordAuthenticator getNtlmPasswordAuthentication () {
        return null;
    }
}