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/*
 * 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.sshd.server.keyprovider;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.KeyPair;
import java.util.concurrent.atomic.AtomicInteger;

import static org.junit.Assert.assertEquals;

public class AbstractGeneratorHostKeyProviderTest {

    @Rule
    public TemporaryFolder temporaryFolder = new TemporaryFolder();

    @Test
    public void testOverwriteKey() throws Exception {
        File keyPairFile = temporaryFolder.newFile();

        TestProvider provider = new TestProvider(keyPairFile);
        provider.loadKeys();
        assertEquals(1, provider.getWriteCount());

        provider = new TestProvider(keyPairFile);
        provider.setOverwriteAllowed(false);
        provider.loadKeys();
        assertEquals(0, provider.getWriteCount());
    }

    private class TestProvider extends AbstractGeneratorHostKeyProvider {
        private final AtomicInteger writes = new AtomicInteger(0);

        private TestProvider(File file) {
            super(file.getAbsolutePath(), "DSA", 512);
        }

        @Override
        protected KeyPair doReadKeyPair(InputStream is) throws Exception {
            return null;
        }

        @Override
        protected void doWriteKeyPair(KeyPair kp, OutputStream os) throws Exception {
            writes.incrementAndGet();
        }

        public int getWriteCount() {
            return writes.get();
        }
    }

}