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.Named;
022import javax.inject.Singleton;
023
024import java.util.regex.Pattern;
025
026import org.eclipse.aether.RepositorySystemSession;
027import org.eclipse.aether.impl.OfflineController;
028import org.eclipse.aether.repository.RemoteRepository;
029import org.eclipse.aether.transfer.RepositoryOfflineException;
030import org.eclipse.aether.util.ConfigUtils;
031
032import static java.util.Objects.requireNonNull;
033
034/**
035 *
036 */
037@Singleton
038@Named
039public class DefaultOfflineController implements OfflineController {
040
041    static final String CONFIG_PROP_OFFLINE_PROTOCOLS = "aether.offline.protocols";
042
043    static final String CONFIG_PROP_OFFLINE_HOSTS = "aether.offline.hosts";
044
045    private static final Pattern SEP = Pattern.compile("\\s*,\\s*");
046
047    @Override
048    public void checkOffline(RepositorySystemSession session, RemoteRepository repository)
049            throws RepositoryOfflineException {
050        requireNonNull(session, "session cannot be null");
051        requireNonNull(repository, "repository cannot be null");
052        if (isOfflineProtocol(session, repository) || isOfflineHost(session, repository)) {
053            return;
054        }
055
056        throw new RepositoryOfflineException(repository);
057    }
058
059    private boolean isOfflineProtocol(RepositorySystemSession session, RemoteRepository repository) {
060        String[] protocols = getConfig(session, CONFIG_PROP_OFFLINE_PROTOCOLS);
061        if (protocols != null) {
062            String protocol = repository.getProtocol();
063            if (!protocol.isEmpty()) {
064                for (String p : protocols) {
065                    if (p.equalsIgnoreCase(protocol)) {
066                        return true;
067                    }
068                }
069            }
070        }
071        return false;
072    }
073
074    private boolean isOfflineHost(RepositorySystemSession session, RemoteRepository repository) {
075        String[] hosts = getConfig(session, CONFIG_PROP_OFFLINE_HOSTS);
076        if (hosts != null) {
077            String host = repository.getHost();
078            if (!host.isEmpty()) {
079                for (String h : hosts) {
080                    if (h.equalsIgnoreCase(host)) {
081                        return true;
082                    }
083                }
084            }
085        }
086        return false;
087    }
088
089    private String[] getConfig(RepositorySystemSession session, String key) {
090        String value = ConfigUtils.getString(session, "", key).trim();
091        if (value.isEmpty()) {
092            return null;
093        }
094        return SEP.split(value);
095    }
096}