001package org.eclipse.aether.transport.http; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022import org.apache.http.Header; 023import org.apache.http.HttpHeaders; 024import org.apache.http.HttpResponse; 025 026import javax.inject.Named; 027import javax.inject.Singleton; 028import java.util.Collections; 029import java.util.Map; 030 031/** 032 * A component extracting Nexus2 ETag "shielded" style-checksums from response headers. 033 * 034 * @since 1.8.0 035 */ 036@Singleton 037@Named( Nexus2ChecksumExtractor.NAME ) 038public class Nexus2ChecksumExtractor 039 extends ChecksumExtractor 040{ 041 public static final String NAME = "nexus2"; 042 043 @Override 044 public Map<String, String> extractChecksums( HttpResponse response ) 045 { 046 // Nexus-style, ETag: "{SHA1{d40d68ba1f88d8e9b0040f175a6ff41928abd5e7}}" 047 Header header = response.getFirstHeader( HttpHeaders.ETAG ); 048 String etag = header != null ? header.getValue() : null; 049 if ( etag != null ) 050 { 051 int start = etag.indexOf( "SHA1{" ), end = etag.indexOf( "}", start + 5 ); 052 if ( start >= 0 && end > start ) 053 { 054 return Collections.singletonMap( "SHA-1", etag.substring( start + 5, end ) ); 055 } 056 } 057 return null; 058 } 059}