/*
    * 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.minio;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  
  import java.util.Map;
  
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.spi.connector.transport.Transporter;
  import org.eclipse.aether.spi.connector.transport.TransporterFactory;
  import org.eclipse.aether.spi.io.PathProcessor;
  import org.eclipse.aether.transfer.NoTransporterException;
  import org.eclipse.aether.util.ConfigUtils;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * A transporter factory for repositories using the S3 API object storage using Minio.
   *
   * @since 2.0.2
   */
  @Named(MinioTransporterFactory.NAME)
  public final class MinioTransporterFactory implements TransporterFactory {
      public static final String NAME = "minio";
  
      private static final float DEFAULT_PRIORITY = 0.0f;
  
      private float priority = DEFAULT_PRIORITY;
  
      private final Map<String, ObjectNameMapperFactory> objectNameMapperFactories;
  
      private final PathProcessor pathProcessor;
  
      @Inject
      public MinioTransporterFactory(
              Map<String, ObjectNameMapperFactory> objectNameMapperFactories, PathProcessor pathProcessor) {
          this.objectNameMapperFactories = requireNonNull(objectNameMapperFactories, "objectNameMapperFactories");
          this.pathProcessor = requireNonNull(pathProcessor, "pathProcessor");
      }
  
      @Override
      public float getPriority() {
          return priority;
      }
  
      public MinioTransporterFactory setPriority(float priority) {
          this.priority = priority;
          return this;
      }
  
      @Override
      public Transporter newInstance(RepositorySystemSession session, RemoteRepository repository)
              throws NoTransporterException {
          requireNonNull(session, "session cannot be null");
          requireNonNull(repository, "repository cannot be null");
  
          // this check is here only to support "minio+http" and "s3+http" protocols by default. But also when
          // raised priorities by user, allow to "overtake" plain HTTP repositories, if needed.
          RemoteRepository adjusted = repository;
          boolean prefixStripped = false;
          if ("minio+http".equalsIgnoreCase(repository.getProtocol())
                  || "minio+https".equalsIgnoreCase(repository.getProtocol())) {
              adjusted = new RemoteRepository.Builder(repository)
                      .setUrl(repository.getUrl().substring("minio+".length()))
                      .build();
              prefixStripped = true;
          } else if ("s3+http".equalsIgnoreCase(repository.getProtocol())
                  || "s3+https".equalsIgnoreCase(repository.getProtocol())) {
              adjusted = new RemoteRepository.Builder(repository)
                      .setUrl(repository.getUrl().substring("s3+".length()))
                      .build();
              prefixStripped = true;
          } else if (priority == DEFAULT_PRIORITY) {
              throw new NoTransporterException(
                      repository,
                      "To use Minio transport with plain HTTP/HTTPS repositories, increase the Minio transport priority");
          }
          // Plaintext endpoints from "minio+http"/"s3+http" URLs are not matched by "external:http:*" mirror
          // blocking (the repository protocol string is not "http") and offer no transport integrity: artifacts
          // and their checksum objects travel over the same tamperable channel. Refuse them unless the operator
         // explicitly opted in.
         if (prefixStripped && "http".equalsIgnoreCase(adjusted.getProtocol())) {
             boolean allowInsecureProtocol = ConfigUtils.getBoolean(
                     session,
                     MinioTransporterConfigurationKeys.DEFAULT_ALLOW_INSECURE_PROTOCOL,
                     MinioTransporterConfigurationKeys.CONFIG_PROP_ALLOW_INSECURE_PROTOCOL + "." + repository.getId(),
                     MinioTransporterConfigurationKeys.CONFIG_PROP_ALLOW_INSECURE_PROTOCOL);
             if (!allowInsecureProtocol) {
                 throw new NoTransporterException(
                         repository,
                         "Plaintext HTTP object storage endpoints are insecure (no transport integrity; not subject"
                                 + " to 'external:http:*' mirror blocking) and are refused by default: use the"
                                 + " 'minio+https'/'s3+https' URL form, or explicitly opt in by setting the"
                                 + " configuration property '"
                                 + MinioTransporterConfigurationKeys.CONFIG_PROP_ALLOW_INSECURE_PROTOCOL
                                 + "' (optionally suffixed with '." + repository.getId() + "') to 'true'");
             }
         }
         String objectNameMapperConf = ConfigUtils.getString(
                 session,
                 MinioTransporterConfigurationKeys.DEFAULT_OBJECT_NAME_MAPPER,
                 MinioTransporterConfigurationKeys.CONFIG_PROP_OBJECT_NAME_MAPPER + "." + repository.getId(),
                 MinioTransporterConfigurationKeys.CONFIG_PROP_OBJECT_NAME_MAPPER);
         ObjectNameMapperFactory objectNameMapperFactory = objectNameMapperFactories.get(objectNameMapperConf);
         if (objectNameMapperFactory == null) {
             throw new IllegalArgumentException("Unknown object name mapper configured '" + objectNameMapperConf
                     + "' for repository " + repository.getId());
         }
         return new MinioTransporter(session, adjusted, objectNameMapperFactory, pathProcessor);
     }
 }