/*
    * 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.eclipse.aether.transport.file;
  
  import java.nio.file.*;
  
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.repository.RepositoryUriUtils;
  import org.eclipse.aether.spi.connector.transport.AbstractTransporter;
  import org.eclipse.aether.spi.connector.transport.GetTask;
  import org.eclipse.aether.spi.connector.transport.PeekTask;
  import org.eclipse.aether.spi.connector.transport.PutTask;
  import org.eclipse.aether.spi.connector.transport.TransportTask;
  import org.eclipse.aether.transfer.NoTransporterException;
  
  /**
   * A transporter using {@link java.io.File}.
   */
  final class FileTransporter extends AbstractTransporter {
  
      private final Path basePath;
  
      FileTransporter(RemoteRepository repository) throws NoTransporterException {
          try {
              basePath = Paths.get(RepositoryUriUtils.toUri(repository.getUrl())).toAbsolutePath();
          } catch (FileSystemNotFoundException | IllegalArgumentException e) {
              throw new NoTransporterException(repository, e);
          }
      }
  
      Path getBasePath() {
          return basePath;
      }
  
      @Override
      public int classify(Throwable error) {
          if (error instanceof ResourceNotFoundException) {
              return ERROR_NOT_FOUND;
          }
          return ERROR_OTHER;
      }
  
      @Override
      protected void implPeek(PeekTask task) throws Exception {
          getPath(task, true);
      }
  
      @Override
      protected void implGet(GetTask task) throws Exception {
          Path path = getPath(task, true);
          utilGet(task, Files.newInputStream(path), true, Files.size(path), false);
      }
  
      @Override
      protected void implPut(PutTask task) throws Exception {
          Path path = getPath(task, false);
          Files.createDirectories(path.getParent());
          try {
              utilPut(task, Files.newOutputStream(path), true);
          } catch (Exception e) {
              Files.deleteIfExists(path);
              throw e;
          }
      }
  
      private Path getPath(TransportTask task, boolean required) throws Exception {
          String path = task.getLocation().getPath();
          if (path.contains("../")) {
              throw new IllegalArgumentException("illegal resource path: " + path);
          }
          Path file = basePath.resolve(path);
          if (required && !Files.isRegularFile(file)) {
              throw new ResourceNotFoundException("Could not locate " + file);
          }
          return file;
      }
  
      @Override
      protected void implClose() {}
  }