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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.internal.impl.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  import java.util.function.Function;
27  
28  import org.eclipse.aether.internal.impl.checksum.Sha1ChecksumAlgorithmFactory;
29  import org.eclipse.aether.spi.connector.transport.http.ChecksumExtractorStrategy;
30  import org.eclipse.aether.spi.connector.transport.http.HttpConstants;
31  
32  /**
33   * Sonatype Nexus2 checksum extractor.
34   */
35  @Singleton
36  @Named(Nx2ChecksumExtractor.NAME)
37  public final class Nx2ChecksumExtractor extends ChecksumExtractorStrategy {
38      public static final String NAME = "nx2";
39  
40      @Override
41      public Map<String, String> extractChecksums(Function<String, String> headerGetter) {
42          // Nexus-style, ETag: "{SHA1{d40d68ba1f88d8e9b0040f175a6ff41928abd5e7}}"
43          String etag = headerGetter.apply(HttpConstants.ETAG);
44          if (etag != null) {
45              int start = etag.indexOf("SHA1{"), end = etag.indexOf("}", start + 5);
46              if (start >= 0 && end > start) {
47                  return Collections.singletonMap(Sha1ChecksumAlgorithmFactory.NAME, etag.substring(start + 5, end));
48              }
49          }
50          return null;
51      }
52  }