package org.apache.maven.scm.provider.git.jgit.command;
   
   /*
    * 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.
   */
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.maven.scm.provider.git.repository.GitScmProviderRepository;
  import org.eclipse.jgit.transport.CredentialsProvider;
  import org.eclipse.jgit.transport.URIish;
  import org.eclipse.jgit.transport.sshd.IdentityPasswordProvider;
  import org.eclipse.jgit.transport.sshd.KeyPasswordProvider;
  import org.eclipse.jgit.transport.sshd.SshdSessionFactory;
  import org.eclipse.jgit.util.StringUtils;
  import org.slf4j.Logger;
  
  /**
   * {@link SshdSessionFactory} considering the settings from {@link GitScmProviderRepository}.
   *
   */
  public class ScmProviderAwareSshdSessionFactory extends SshdSessionFactory
  {
      private final GitScmProviderRepository repo;
      private final Logger logger;
  
      public ScmProviderAwareSshdSessionFactory( GitScmProviderRepository repo, Logger logger )
      {
          this.repo = repo;
          this.logger = logger;
      }
  
      @Override
      protected List<Path> getDefaultIdentities( File sshDir )
      {
          if ( !StringUtils.isEmptyOrNull( repo.getPrivateKey() ) )
          {
              logger.debug( "Using private key at {}", repo.getPrivateKey() );
              return Collections.singletonList( Paths.get( repo.getPrivateKey() ) );
          }
          else
          {
              return super.getDefaultIdentities( sshDir );
          }
      }
  
      @Override
      protected KeyPasswordProvider createKeyPasswordProvider( CredentialsProvider provider )
      {
          if ( repo.getPassphrase() != null )
          {
              return new IdentityPasswordProvider( provider )
              {
                  @Override
                  public char[] getPassphrase( URIish uri, int attempt ) throws IOException
                  {
                      if ( attempt > 0 )
                      {
                          throw new IOException( "Passphrase was not correct in first attempt, "
                              + "canceling further attempts!" );
                      }
                      logger.debug( "Using stored passphrase" );
                      return repo.getPassphrase().toCharArray();
                  }
              };
          }
          else
          {
              return super.createKeyPasswordProvider( provider );
          }
      }
  }