content: package org.apache.archiva.policies;
  
  /*
   * 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 org.apache.archiva.policies.urlcache.UrlFailureCache;
  import org.apache.archiva.repository.storage.StorageAsset;
  import org.apache.commons.lang3.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.stereotype.Service;
  
  import javax.inject.Inject;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Properties;
  
  /**
   * {@link PreDownloadPolicy} to check if the requested url has failed before.
   */
  @Service( "preDownloadPolicy#cache-failures" )
  public class CachedFailuresPolicy
      extends AbstractPolicy implements PreDownloadPolicy
  {
      private Logger log = LoggerFactory.getLogger( CachedFailuresPolicy.class );
      private static final String ID = "cache-failures";
  
      /**
       * The NO policy setting means that the the existence of old failures is <strong>not</strong> checked.
       * All resource requests are allowed thru to the remote repo.
       */
      public static final StandardOption NO = StandardOption.NO;
  
      /**
       * The YES policy setting means that the existence of old failures is checked, and will
       * prevent the request from being performed against the remote repo.
       */
      public static final StandardOption YES = StandardOption.YES;
  
      @Inject
      private UrlFailureCache urlFailureCache;
  
      private List<PolicyOption> options = new ArrayList<>( 2 );
  
      public CachedFailuresPolicy()
      {
          super();
          options.add( NO );
          options.add( YES );
      }
  
      @Override
      public void applyPolicy( PolicyOption policySetting, Properties request, StorageAsset localFile )
          throws PolicyViolationException, PolicyConfigurationException
      {
          if ( !options.contains( policySetting ) )
          {
              // Not a valid code.
              throw new PolicyConfigurationException( "Unknown cache-failues policy setting [" + policySetting +
                                                          "], valid settings are [" + StringUtils.join(
                  options.iterator(), "," ) + "]" );
          }
  
          if ( NO.equals( policySetting ) )
          {
              // Skip.
              log.debug( "OK to fetch, check-failures policy set to NO." );
              return;
          }
  
          String url = request.getProperty( "url" );
  
          if ( StringUtils.isNotBlank( url ) )
          {
              if ( urlFailureCache.hasFailedBefore( url ) )
              {
                  throw new PolicyViolationException(
                      "NO to fetch, check-failures detected previous failure on url: " + url );
              }
          }
  
          log.debug( "OK to fetch, check-failures detected no issues." );
      }
  
      @Override
      public PolicyOption getDefaultOption()
      {
          return NO;
      }
  
      @Override
      public String getId()
      {
          return ID;
      }
  
  
      @Override
      public List<PolicyOption> getOptions()
      {
          return options;
      }
  }
  