1 package org.eclipse.aether.transport.http;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import org.apache.http.Header;
23 import org.apache.http.HttpHeaders;
24 import org.apache.http.HttpResponse;
25
26 import javax.inject.Named;
27 import javax.inject.Singleton;
28 import java.util.Collections;
29 import java.util.Map;
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
39 extends ChecksumExtractor
40 {
41 public static final String NAME = "nexus2";
42
43 @Override
44 public Map<String, String> extractChecksums( HttpResponse response )
45 {
46 // Nexus-style, ETag: "{SHA1{d40d68ba1f88d8e9b0040f175a6ff41928abd5e7}}"
47 Header header = response.getFirstHeader( HttpHeaders.ETAG );
48 String etag = header != null ? header.getValue() : null;
49 if ( etag != null )
50 {
51 int start = etag.indexOf( "SHA1{" ), end = etag.indexOf( "}", start + 5 );
52 if ( start >= 0 && end > start )
53 {
54 return Collections.singletonMap( "SHA-1", etag.substring( start + 5, end ) );
55 }
56 }
57 return null;
58 }
59 }