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.Collections;
25 import java.util.Map;
26
27 import org.apache.http.Header;
28 import org.apache.http.HttpHeaders;
29 import org.apache.http.HttpResponse;
30
31 /**
32 * A component extracting Nexus2 ETag "shielded" style-checksums from response headers.
33 *
34 * @since 1.8.0
35 */
36 @Singleton
37 @Named(Nexus2ChecksumExtractor.NAME)
38 public class Nexus2ChecksumExtractor extends ChecksumExtractor {
39 public static final String NAME = "nexus2";
40
41 @Override
42 public Map<String, String> extractChecksums(HttpResponse response) {
43 // Nexus-style, ETag: "{SHA1{d40d68ba1f88d8e9b0040f175a6ff41928abd5e7}}"
44 Header header = response.getFirstHeader(HttpHeaders.ETAG);
45 String etag = header != null ? header.getValue() : null;
46 if (etag != null) {
47 int start = etag.indexOf("SHA1{"), end = etag.indexOf("}", start + 5);
48 if (start >= 0 && end > start) {
49 return Collections.singletonMap("SHA-1", etag.substring(start + 5, end));
50 }
51 }
52 return null;
53 }
54 }