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 }