/*
 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package sun.net.www.protocol.http.ntlm;

import java.net.URL;

/**
 * This class is used to call back to deployment to determine if a given
 * URL is trusted. Transparent authentication (try with logged in users
 * credentials without prompting) should only be tried with trusted sites.
 */
public abstract class NTLMAuthenticationCallback {
    private static volatile NTLMAuthenticationCallback callback =
            new DefaultNTLMAuthenticationCallback();

    public static void setNTLMAuthenticationCallback(
            NTLMAuthenticationCallback callback) {
        NTLMAuthenticationCallback.callback = callback;
    }

    public static NTLMAuthenticationCallback getNTLMAuthenticationCallback() {
        return callback;
    }

    /**
     * Returns true if the given site is trusted, i.e. we can try
     * transparent Authentication.
     */
    public abstract boolean isTrustedSite(URL url);

    static class DefaultNTLMAuthenticationCallback extends NTLMAuthenticationCallback {
        @Override
        public boolean isTrustedSite(URL url) { return true; }
    }
}

