com.blackducksoftware.integration.hub.detect.util.DetectZipUtil.java Source code

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Here is the source code for com.blackducksoftware.integration.hub.detect.util.DetectZipUtil.java

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/**
 * hub-detect
 *
 * Copyright (C) 2019 Black Duck Software, Inc.
 * http://www.blackducksoftware.com/
 *
 * 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 com.blackducksoftware.integration.hub.detect.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import org.apache.commons.compress.utils.IOUtils;

public class DetectZipUtil {

    public static void unzip(File zip, File dest) throws IOException {
        unzip(zip, dest, Charset.defaultCharset());
    }

    public static void unzip(File zip, File dest, Charset charset) throws IOException {
        Path destPath = dest.toPath();
        try (ZipFile zipFile = new ZipFile(zip, ZipFile.OPEN_READ, charset)) {
            Enumeration<? extends ZipEntry> entries = zipFile.entries();
            while (entries.hasMoreElements()) {
                ZipEntry entry = entries.nextElement();
                Path entryPath = destPath.resolve(entry.getName());
                if (!entryPath.normalize().startsWith(dest.toPath()))
                    throw new IOException("Zip entry contained path traversal");
                if (entry.isDirectory()) {
                    Files.createDirectories(entryPath);
                } else {
                    Files.createDirectories(entryPath.getParent());
                    try (InputStream in = zipFile.getInputStream(entry)) {
                        try (OutputStream out = new FileOutputStream(entryPath.toFile())) {
                            IOUtils.copy(in, out);
                        }
                    }
                }
            }
        }
    }
}