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.transport.jdk;
020
021import javax.inject.Inject;
022import javax.inject.Named;
023
024import org.eclipse.aether.RepositorySystemSession;
025import org.eclipse.aether.repository.RemoteRepository;
026import org.eclipse.aether.spi.connector.transport.http.ChecksumExtractor;
027import org.eclipse.aether.spi.connector.transport.http.HttpTransporter;
028import org.eclipse.aether.spi.connector.transport.http.HttpTransporterFactory;
029import org.eclipse.aether.transfer.NoTransporterException;
030
031import static java.util.Objects.requireNonNull;
032
033/**
034 * JDK Transport factory: on Java11+ it works.
035 *
036 * @since 2.0.0
037 */
038@Named(JdkTransporterFactory.NAME)
039public final class JdkTransporterFactory implements HttpTransporterFactory {
040    public static final String NAME = "jdk";
041
042    private float priority = 10.0f;
043
044    private final ChecksumExtractor checksumExtractor;
045
046    @Inject
047    public JdkTransporterFactory(ChecksumExtractor checksumExtractor) {
048        this.checksumExtractor = requireNonNull(checksumExtractor, "checksumExtractor");
049    }
050
051    @Override
052    public float getPriority() {
053        return priority;
054    }
055
056    public JdkTransporterFactory setPriority(float priority) {
057        this.priority = priority;
058        return this;
059    }
060
061    @Override
062    public HttpTransporter newInstance(RepositorySystemSession session, RemoteRepository repository)
063            throws NoTransporterException {
064        requireNonNull(session, "session cannot be null");
065        requireNonNull(repository, "repository cannot be null");
066
067        if (!"http".equalsIgnoreCase(repository.getProtocol()) && !"https".equalsIgnoreCase(repository.getProtocol())) {
068            throw new NoTransporterException(repository, "Only HTTP/HTTPS is supported");
069        }
070
071        return new JdkTransporter(session, repository, javaVersion(), checksumExtractor);
072    }
073
074    private static int javaVersion() {
075        try {
076            final String version = System.getProperty("java.version", "11" /* default must pass */);
077            final int dot = version.indexOf('.');
078            final int hyphen = version.indexOf('-');
079            final int sep = (dot > 0 && dot < hyphen || hyphen < 0) ? dot : hyphen;
080            return Integer.parseInt(sep > 0 ? version.substring(0, sep) : version);
081        } catch (final NumberFormatException nfe) {
082            return 11; // cannot be a pre-java 11 version so let it pass
083        }
084    }
085}