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;
020
021import javax.inject.Inject;
022import javax.inject.Named;
023import javax.inject.Singleton;
024
025import java.util.ArrayList;
026import java.util.Collections;
027import java.util.List;
028import java.util.Map;
029
030import org.eclipse.aether.RepositorySystemSession;
031import org.eclipse.aether.repository.Authentication;
032import org.eclipse.aether.repository.Proxy;
033import org.eclipse.aether.repository.RemoteRepository;
034import org.eclipse.aether.spi.connector.transport.Transporter;
035import org.eclipse.aether.spi.connector.transport.TransporterFactory;
036import org.eclipse.aether.spi.connector.transport.TransporterProvider;
037import org.eclipse.aether.transfer.NoTransporterException;
038import org.slf4j.Logger;
039import org.slf4j.LoggerFactory;
040
041import static java.util.Objects.requireNonNull;
042
043/**
044 */
045@Singleton
046@Named
047public final class DefaultTransporterProvider implements TransporterProvider {
048
049    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultTransporterProvider.class);
050
051    private final Map<String, TransporterFactory> transporterFactories;
052
053    @Inject
054    public DefaultTransporterProvider(Map<String, TransporterFactory> transporterFactories) {
055        this.transporterFactories = Collections.unmodifiableMap(transporterFactories);
056    }
057
058    @Override
059    public Transporter newTransporter(RepositorySystemSession session, RemoteRepository repository)
060            throws NoTransporterException {
061        requireNonNull(session, "session cannot be null");
062        requireNonNull(repository, "repository cannot be null");
063
064        PrioritizedComponents<TransporterFactory> factories = PrioritizedComponents.reuseOrCreate(
065                session, TransporterFactory.class, transporterFactories, TransporterFactory::getPriority);
066
067        List<NoTransporterException> errors = new ArrayList<>();
068        for (PrioritizedComponent<TransporterFactory> factory : factories.getEnabled()) {
069            try {
070                Transporter transporter = factory.getComponent().newInstance(session, repository);
071
072                if (LOGGER.isDebugEnabled()) {
073                    StringBuilder buffer = new StringBuilder(256);
074                    buffer.append("Using transporter ")
075                            .append(transporter.getClass().getSimpleName());
076                    Utils.appendClassLoader(buffer, transporter);
077                    buffer.append(" with priority ").append(factory.getPriority());
078                    buffer.append(" for ").append(repository.getUrl());
079
080                    Authentication auth = repository.getAuthentication();
081                    if (auth != null) {
082                        buffer.append(" with ").append(auth);
083                    }
084
085                    Proxy proxy = repository.getProxy();
086                    if (proxy != null) {
087                        buffer.append(" via ")
088                                .append(proxy.getHost())
089                                .append(':')
090                                .append(proxy.getPort());
091
092                        auth = proxy.getAuthentication();
093                        if (auth != null) {
094                            buffer.append(" with ").append(auth);
095                        }
096                    }
097
098                    LOGGER.debug(buffer.toString());
099                }
100
101                return transporter;
102            } catch (NoTransporterException e) {
103                // continue and try next factory
104                LOGGER.debug("Could not obtain transporter factory for {}", repository, e);
105                errors.add(e);
106            }
107        }
108
109        StringBuilder buffer = new StringBuilder(256);
110        if (factories.isEmpty()) {
111            buffer.append("No transporter factories registered");
112        } else {
113            buffer.append("Cannot access ").append(repository.getUrl());
114            buffer.append(" using the registered transporter factories: ");
115            factories.list(buffer);
116        }
117
118        // create exception: if one error, make it cause
119        NoTransporterException ex =
120                new NoTransporterException(repository, buffer.toString(), errors.size() == 1 ? errors.get(0) : null);
121        // if more errors, make them all suppressed
122        if (errors.size() > 1) {
123            errors.forEach(ex::addSuppressed);
124        }
125        throw ex;
126    }
127}