com.netflix.spinnaker.clouddriver.appengine.artifacts.StorageUtils.java Source code

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Here is the source code for com.netflix.spinnaker.clouddriver.appengine.artifacts.StorageUtils.java

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/*
 * Copyright 2017 Google, Inc.
 *
 * Licensed 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.netflix.spinnaker.clouddriver.appengine.artifacts;

import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.utils.IOUtils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.util.Stack;

public class StorageUtils {
    public static void untarStreamToPath(InputStream inputStream, String basePath) throws IOException {
        class DirectoryTimestamp {
            public DirectoryTimestamp(File d, long m) {
                directory = d;
                millis = m;
            }

            public File directory;
            public long millis;
        }
        ;
        // Directories come in hierarchical order within the stream, but
        // we need to set their timestamps after their children have been written.
        Stack<DirectoryTimestamp> directoryStack = new Stack<DirectoryTimestamp>();

        File baseDirectory = new File(basePath);
        baseDirectory.mkdir();

        TarArchiveInputStream tarStream = new TarArchiveInputStream(inputStream);
        for (TarArchiveEntry entry = tarStream.getNextTarEntry(); entry != null; entry = tarStream
                .getNextTarEntry()) {
            File target = new File(baseDirectory, entry.getName());
            if (entry.isDirectory()) {
                directoryStack.push(new DirectoryTimestamp(target, entry.getModTime().getTime()));
                continue;
            }
            writeStreamToFile(tarStream, target);
            target.setLastModified(entry.getModTime().getTime());
        }

        while (!directoryStack.empty()) {
            DirectoryTimestamp info = directoryStack.pop();
            info.directory.setLastModified(info.millis);
        }
        tarStream.close();
    }

    public static void writeStreamToFile(InputStream sourceStream, File target) throws IOException {
        File parent = target.getParentFile();
        if (!parent.exists()) {
            parent.mkdirs();
        }
        OutputStream targetStream = new FileOutputStream(target);
        IOUtils.copy(sourceStream, targetStream);
        targetStream.close();
    }
}