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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 */

package org.glassfish.cluster.ssh.util;

import com.trilead.ssh2.KnownHosts;
import com.trilead.ssh2.ServerHostKeyVerifier;

import java.io.IOException;

/**
 * @author Rajiv Mordani
 */
public class HostVerifier implements ServerHostKeyVerifier {

    private KnownHosts knownHosts;

    public HostVerifier(KnownHosts knownHosts) {
        if (knownHosts == null) {
            throw new IllegalArgumentException("Known hosts database cannot be null");
        }
        this.knownHosts = knownHosts;
    }

    public boolean verifyServerHostKey(String hostName, int port, String serverHostKeyAlgorithm,byte[] serverHostKey)
                        throws IOException 
    {
        int result = knownHosts.verifyHostkey(hostName, serverHostKeyAlgorithm, serverHostKey);
        switch (result) {
            case KnownHosts.HOSTKEY_IS_OK:
                return true;

            case KnownHosts.HOSTKEY_IS_NEW:
                // Accept new keys
            case KnownHosts.HOSTKEY_HAS_CHANGED:
                // In a virtualized environment we may have VMs that are frequently
                // (re)created causing host keys to change. Allow that.
                knownHosts.addHostkey(new String[] {hostName}, serverHostKeyAlgorithm, serverHostKey);
                return true;
            
            default:
                throw new IllegalStateException("Cannot verify server key");
        }

    }
    
}