/*
    * 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.maven.scm.provider.git.jgit.command;
  
  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);
          }
      }
  }