org.eclipse.aether.transport.http.Nexus2ChecksumExtractor Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.eclipse.aether.transport.http;
import javax.inject.Named;
import javax.inject.Singleton;
import java.util.Collections;
import java.util.Map;
import org.apache.http.Header;
import org.apache.http.HttpHeaders;
import org.apache.http.HttpResponse;
/**
* A component extracting Nexus2 ETag "shielded" style-checksums from response headers.
*
* @since 1.8.0
*/
@Singleton
@Named(Nexus2ChecksumExtractor.NAME)
public class Nexus2ChecksumExtractor extends ChecksumExtractor {
public static final String NAME = "nexus2";
@Override
public Map extractChecksums(HttpResponse response) {
// Nexus-style, ETag: "{SHA1{d40d68ba1f88d8e9b0040f175a6ff41928abd5e7}}"
Header header = response.getFirstHeader(HttpHeaders.ETAG);
String etag = header != null ? header.getValue() : null;
if (etag != null) {
int start = etag.indexOf("SHA1{"), end = etag.indexOf("}", start + 5);
if (start >= 0 && end > start) {
return Collections.singletonMap("SHA-1", etag.substring(start + 5, end));
}
}
return null;
}
}