content: package org.apache.archiva.webdav.util;
  
  /*
   * 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.commons.lang3.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.stereotype.Service;
  
  import javax.annotation.PostConstruct;
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.net.URL;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.StringTokenizer;
  
  /**
   * MimeTypes
   */
  @Service( "mimeTpes" )
  public class MimeTypes
  {
      private static final String DEFAULT_MIME_TYPE = "application/octet-stream";
  
      private String resource = "org/apache/archiva/webdav/util/mime.types";
  
      private Map<String, String> mimeMap = new HashMap<>();
  
      private Logger log = LoggerFactory.getLogger( MimeTypes.class );
  
      /**
       * Get the Mime Type for the provided filename.
       *
       * @param filename the filename to obtain the mime type for.
       * @return a mime type String, or null if filename is null, has no extension, or no mime type is associated with it.
       */
      public String getMimeType( String filename )
      {
          String value = null;
          if ( !StringUtils.isEmpty( filename ) )
          {
              int index = filename.lastIndexOf( '.' );
  
              if ( index >= 0 )
              {
                  value = (String) mimeMap.get( filename.substring( index + 1 ).toLowerCase() );
              }
          }
  
          if ( value == null )
          {
              value = DEFAULT_MIME_TYPE;
          }
  
          return value;
  
      }
  
      @PostConstruct
      public void initialize()
      {
          load( resource );
      }
  
      public void load( String resourceName )
      {
          ClassLoader cloader = this.getClass().getClassLoader();
  
          /* Load up the mime types table */
          URL mimeURL = cloader.getResource( resourceName );
  
          if ( mimeURL == null )
          {
              throw new IllegalStateException( "Unable to find resource " + resourceName );
          }
  
          try (InputStream mimeStream = mimeURL.openStream())
          {
              load( mimeStream );
          }
          catch ( IOException e )
          {
              log.error( "Unable to load mime map {} : {}", resourceName, e.getMessage(), e );
          }
      }
  
      public void load( InputStream mimeStream )
      {
          mimeMap.clear();
  
          try (InputStreamReader reader = new InputStreamReader( mimeStream ))
          {
              try (BufferedReader buf = new BufferedReader( reader ))
              {
  
                  String line = null;
  
                  while ( ( line = buf.readLine() ) != null )
                  {
                      line = line.trim();
  
                      if ( line.length() == 0 )
                      {
                          // empty line. skip it
                          continue;
                      }
  
                      if ( line.startsWith( "#" ) )
                      {
                          // Comment. skip it
                          continue;
                      }
  
                      StringTokenizer tokenizer = new StringTokenizer( line );
                      if ( tokenizer.countTokens() > 1 )
                      {
                          String type = tokenizer.nextToken();
                          while ( tokenizer.hasMoreTokens() )
                          {
                              String extension = tokenizer.nextToken().toLowerCase();
                              this.mimeMap.put( extension, type );
                          }
                      }
                  }
              }
          }
          catch ( IOException e )
          {
              log.error( "Unable to read mime types from input stream : {}", e.getMessage(), e );
          }
      }
  
      public String getResource()
      {
          return resource;
      }
  
      public void setResource( String resource )
      {
          this.resource = resource;
      }
  }
  