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.apache.maven.scm.provider.svn;
020
021import java.io.File;
022import java.io.IOException;
023import java.io.UncheckedIOException;
024import java.nio.charset.StandardCharsets;
025import java.nio.file.Files;
026import java.nio.file.Path;
027import java.util.ArrayList;
028import java.util.Iterator;
029import java.util.List;
030import java.util.stream.Collectors;
031
032import org.codehaus.plexus.util.Os;
033
034/**
035 * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
036 */
037public class SvnConfigFileReader {
038    private File configDirectory;
039
040    public File getConfigDirectory() {
041        if (configDirectory == null) {
042            if (Os.isFamily(Os.FAMILY_WINDOWS)) {
043                configDirectory = new File(System.getenv("APPDATA"), "Subversion");
044            } else {
045                configDirectory = new File(System.getProperty("user.home"), ".subversion");
046            }
047        }
048
049        return configDirectory;
050    }
051
052    public void setConfigDirectory(File configDirectory) {
053        this.configDirectory = configDirectory;
054    }
055
056    public String getProperty(String group, String propertyName) {
057        List<String> lines = getConfigLines();
058
059        boolean inGroup = false;
060        for (Iterator<String> i = lines.iterator(); i.hasNext(); ) {
061            String line = i.next().trim();
062
063            if (!inGroup) {
064                if (("[" + group + "]").equals(line)) {
065                    inGroup = true;
066                }
067            } else {
068                if (line.startsWith("[") && line.endsWith("]")) {
069                    // a new group start
070                    return null;
071                }
072
073                if (line.startsWith("#")) {
074                    continue;
075                }
076                if (line.indexOf('=') < 0) {
077                    continue;
078                }
079
080                String property = line.substring(0, line.indexOf('=')).trim();
081
082                if (!property.equals(propertyName)) {
083                    continue;
084                }
085
086                String value = line.substring(line.indexOf('=') + 1);
087                return value.trim();
088            }
089        }
090
091        return null;
092    }
093
094    /**
095     * Load the svn config file.
096     *
097     * @return the list of all non-comment, non-empty lines in the config file
098     */
099    private List<String> getConfigLines() {
100        Path configPath = getConfigDirectory().toPath().resolve("config");
101        if (Files.exists(configPath)) {
102            try {
103                return Files.lines(configPath, StandardCharsets.UTF_8)
104                        .filter(line -> !line.isEmpty())
105                        .filter(line -> !line.startsWith("#"))
106                        .collect(Collectors.toCollection(ArrayList::new));
107            } catch (UncheckedIOException | IOException e) {
108                return new ArrayList<>();
109            }
110        }
111        return new ArrayList<>();
112    }
113}