/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.karaf.shell.ssh.keygenerator;

import java.io.File;
import java.nio.file.Files;
import java.security.KeyPair;
import java.security.interfaces.RSAPrivateCrtKey;
import java.util.List;

import org.apache.commons.ssl.PKCS8Key;
import org.apache.sshd.common.config.keys.KeyUtils;
import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
import org.junit.Assert;
import org.junit.Test;

public class OpenSSHGeneratorKeyFileProviderTest {

    @Test
    public void writeSshKey() throws Exception {
        File temp = File.createTempFile(this.getClass().getCanonicalName(), ".pem");
        temp.deleteOnExit();

        KeyPair kp = new OpenSSHKeyPairGenerator(KeyUtils.RSA_ALGORITHM, 1024).generate();
        new PemWriter(temp).writeKeyPair(KeyUtils.RSA_ALGORITHM, kp);

        //File path = new File("/home/cschneider/.ssh/id_rsa");
        OpenSSHKeyPairProvider prov = new OpenSSHKeyPairProvider(temp, KeyUtils.RSA_ALGORITHM, 1024);
        KeyPair keys = prov.loadKeys().iterator().next();
        Assert.assertNotNull(keys);
        Assert.assertTrue("Loaded key is not RSA Key", keys.getPrivate() instanceof RSAPrivateCrtKey);
    }

    @Test
    public void convertSimpleKey() throws Exception {
        File temp = File.createTempFile(this.getClass().getCanonicalName(), ".pem");
        temp.deleteOnExit();

        SimpleGeneratorHostKeyProvider simpleGenerator = new SimpleGeneratorHostKeyProvider(temp);
        simpleGenerator.setKeySize(2048);
        simpleGenerator.setAlgorithm("DSA");
        List<KeyPair> keys = simpleGenerator.loadKeys();
        KeyPair simpleKeyPair = keys.stream().findFirst().get();

        Assert.assertEquals("DSA", simpleKeyPair.getPrivate().getAlgorithm());

        OpenSSHKeyPairProvider provider = new OpenSSHKeyPairProvider(temp, "DSA", 2048);
        KeyPair convertedKeyPair = provider.loadKeys().iterator().next();
        Assert.assertEquals("DSA", convertedKeyPair.getPrivate().getAlgorithm());

        Assert.assertArrayEquals(simpleKeyPair.getPrivate().getEncoded(),convertedKeyPair.getPrivate().getEncoded());
        Assert.assertArrayEquals(simpleKeyPair.getPublic().getEncoded(),convertedKeyPair.getPublic().getEncoded());

        //also test that the original file has been replaced
        PKCS8Key pkcs8 = new PKCS8Key(Files.newInputStream(temp.toPath()), null );
        KeyPair keyPair = new KeyPair(pkcs8.getPublicKey(), pkcs8.getPrivateKey());
        Assert.assertArrayEquals(simpleKeyPair.getPrivate().getEncoded(),keyPair.getPrivate().getEncoded());

    }

}
