001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.eclipse.aether.internal.impl.transport.http;
020
021import javax.inject.Named;
022import javax.inject.Singleton;
023
024import java.util.Collections;
025import java.util.Map;
026import java.util.function.Function;
027
028import org.eclipse.aether.internal.impl.checksum.Sha1ChecksumAlgorithmFactory;
029import org.eclipse.aether.spi.connector.transport.http.ChecksumExtractorStrategy;
030import org.eclipse.aether.spi.connector.transport.http.HttpConstants;
031
032/**
033 * Sonatype Nexus2 checksum extractor.
034 */
035@Singleton
036@Named(Nx2ChecksumExtractor.NAME)
037public final class Nx2ChecksumExtractor extends ChecksumExtractorStrategy {
038    public static final String NAME = "nx2";
039
040    @Override
041    public Map<String, String> extractChecksums(Function<String, String> headerGetter) {
042        // Nexus-style, ETag: "{SHA1{d40d68ba1f88d8e9b0040f175a6ff41928abd5e7}}"
043        String etag = headerGetter.apply(HttpConstants.ETAG);
044        if (etag != null) {
045            int start = etag.indexOf("SHA1{"), end = etag.indexOf("}", start + 5);
046            if (start >= 0 && end > start) {
047                return Collections.singletonMap(Sha1ChecksumAlgorithmFactory.NAME, etag.substring(start + 5, end));
048            }
049        }
050        return null;
051    }
052}