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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.eclipse.aether.transport.http;
20  
21  import javax.inject.Named;
22  import javax.inject.Singleton;
23  
24  import java.util.HashMap;
25  import java.util.Map;
26  
27  import org.apache.http.Header;
28  import org.apache.http.HttpResponse;
29  
30  /**
31   * A component extracting {@code x-} non-standard style checksums from response headers.
32   * Tried headers (in order):
33   * <ul>
34   *     <li>{@code x-checksum-sha1} - Maven Central and other CDNs</li>
35   *     <li>{@code x-checksum-md5} - Maven Central and other CDNs</li>
36   *     <li>{@code x-goog-meta-checksum-sha1} - GCS</li>
37   *     <li>{@code x-goog-meta-checksum-md5} - GCS</li>
38   * </ul>
39   *
40   * @since 1.8.0
41   */
42  @Singleton
43  @Named(XChecksumChecksumExtractor.NAME)
44  public class XChecksumChecksumExtractor extends ChecksumExtractor {
45      public static final String NAME = "x-checksum";
46  
47      @Override
48      public Map<String, String> extractChecksums(HttpResponse response) {
49          String value;
50          HashMap<String, String> result = new HashMap<>();
51          // Central style: x-checksum-sha1: c74edb60ca2a0b57ef88d9a7da28f591e3d4ce7b
52          value = extractChecksum(response, "x-checksum-sha1");
53          if (value != null) {
54              result.put("SHA-1", value);
55          }
56          // Central style: x-checksum-md5: 9ad0d8e3482767c122e85f83567b8ce6
57          value = extractChecksum(response, "x-checksum-md5");
58          if (value != null) {
59              result.put("MD5", value);
60          }
61          if (!result.isEmpty()) {
62              return result;
63          }
64          // Google style: x-goog-meta-checksum-sha1: c74edb60ca2a0b57ef88d9a7da28f591e3d4ce7b
65          value = extractChecksum(response, "x-goog-meta-checksum-sha1");
66          if (value != null) {
67              result.put("SHA-1", value);
68          }
69          // Central style: x-goog-meta-checksum-sha1: 9ad0d8e3482767c122e85f83567b8ce6
70          value = extractChecksum(response, "x-goog-meta-checksum-md5");
71          if (value != null) {
72              result.put("MD5", value);
73          }
74  
75          return result.isEmpty() ? null : result;
76      }
77  
78      private String extractChecksum(HttpResponse response, String name) {
79          Header header = response.getFirstHeader(name);
80          return header != null ? header.getValue() : null;
81      }
82  }