package org.apache.maven.wagon.providers.ssh.knownhost;

 import com.jcraft.jsch.HostKey;

 import com.jcraft.jsch.HostKeyRepository;

 import com.jcraft.jsch.JSch;

 import java.io.ByteArrayInputStream;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.FileWriter;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.PrintWriter;

 import org.codehaus.plexus.util.IOUtil;

 /*

  * Copyright 2001-2005 The Apache Software Foundation.

  *

  * Licensed 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.

  */

 /**

  * Provides known hosts from a file

  *

  * @author Juan F. Codagnone

  * @since Sep 12, 2005

  */

 public class FileKnownHostsProvider

     extends StreamKnownHostsProvider

 {

     private final File file;

     /**

      * Creates the FileKnownHostsProvider.

      *

      * @param file the file that holds the known hosts, in the openssh format

      * @throws IOException

      */

     public FileKnownHostsProvider( File file )

         throws IOException

     {

         super( file.exists() ? (InputStream) new FileInputStream( file ) : new ByteArrayInputStream( "".getBytes() ) );

         this.file = file;

     }

     /**

      * Creates a FileKnownHostsProvider using as file openssh knwon_host

      *

      * @throws IOException

      * @see #FileKnownHostsProvider(File)

      */

     public FileKnownHostsProvider()

         throws IOException

     {

         this( new File( System.getProperty( "user.home" ), ".ssh/known_hosts" ) );

     }

     public void storeKnownHosts( JSch sch )

     {

         PrintWriter w = null;

         try

         {

             w = new PrintWriter( new FileWriter( file ) );

             HostKeyRepository hkr = sch.getHostKeyRepository();

             HostKey[] keys = hkr.getHostKey();

             for ( int i = 0; i < keys.length; i++ )

             {

                 HostKey key = keys[i];

                 w.println( key.getHost() + " " + key.getType() + " " + key.getKey() );

             }

         }

         catch ( IOException e )

         {

             // TODO: log it

         }

         finally

         {

             IOUtil.close( w );

         }

         super.storeKnownHosts( sch );

     }

     public File getFile()

     {

         return file;

     }

 }