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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.vfs2.provider.http;
18  
19  import java.io.IOException;
20  
21  import org.apache.commons.httpclient.Header;
22  import org.apache.commons.httpclient.HeaderElement;
23  import org.apache.commons.httpclient.methods.HeadMethod;
24  import org.apache.commons.vfs2.FileContent;
25  import org.apache.commons.vfs2.FileContentInfo;
26  import org.apache.commons.vfs2.FileContentInfoFactory;
27  import org.apache.commons.vfs2.FileSystemException;
28  import org.apache.commons.vfs2.impl.DefaultFileContentInfo;
29  import org.apache.commons.vfs2.util.FileObjectUtils;
30  
31  /**
32   * Creates FileContentInfo instances for HTTP.
33   */
34  public class HttpFileContentInfoFactory implements FileContentInfoFactory {
35  
36      @Override
37      public FileContentInfo create(final FileContent fileContent) throws FileSystemException {
38  
39          String contentType = null;
40          String contentEncoding = null;
41  
42          HeadMethod headMethod;
43          try (final HttpFileObject<HttpFileSystem> httpFile = (HttpFileObject<HttpFileSystem>) FileObjectUtils
44                  .getAbstractFileObject(fileContent.getFile())) {
45              headMethod = httpFile.getHeadMethod();
46          } catch (final IOException e) {
47              throw new FileSystemException(e);
48          }
49          final Header header = headMethod.getResponseHeader("content-type");
50          if (header != null) {
51              final HeaderElement[] element = header.getElements();
52              if (element != null && element.length > 0) {
53                  contentType = element[0].getName();
54              }
55          }
56  
57          contentEncoding = headMethod.getResponseCharSet();
58  
59          return new DefaultFileContentInfo(contentType, contentEncoding);
60      }
61  }