org.mycore.services.zipper.MCRTarServlet Maven / Gradle / Ivy
/*
* This file is part of *** M y C o R e ***
* See http://www.mycore.de/ for details.
*
* MyCoRe is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* MyCoRe is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MyCoRe. If not, see .
*/
package org.mycore.services.zipper;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.attribute.BasicFileAttributes;
import javax.servlet.ServletOutputStream;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
import org.apache.commons.compress.archivers.tar.TarConstants;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.mycore.datamodel.niofs.MCRPath;
/**
* Uses TAR format to deliver requested content.
*
* This servlet produces TAR files as defined in POSIX.1-2001 standard and UTF-8 encoding for file names.
*
* @author Thomas Scheffler (yagee)
*/
public class MCRTarServlet extends MCRCompressServlet {
private static final long serialVersionUID = 1L;
private static final Logger LOGGER = LogManager.getLogger(MCRTarServlet.class);
@Override
protected void sendCompressedDirectory(MCRPath file, BasicFileAttributes attrs,
TarArchiveOutputStream container) throws IOException {
TarArchiveEntry entry = new TarArchiveEntry(getFilename(file), TarConstants.LF_DIR);
entry.setModTime(attrs.lastModifiedTime().toMillis());
container.putArchiveEntry(entry);
container.closeArchiveEntry();
}
@Override
protected void sendCompressedFile(MCRPath file, BasicFileAttributes attrs,
TarArchiveOutputStream container) throws IOException {
TarArchiveEntry entry = new TarArchiveEntry(getFilename(file));
entry.setModTime(attrs.lastModifiedTime().toMillis());
entry.setSize(attrs.size());
container.putArchiveEntry(entry);
try {
Files.copy(file, container);
} finally {
container.closeArchiveEntry();
}
}
@Override
protected void sendMetadataCompressed(String fileName, byte[] content, long lastModified,
TarArchiveOutputStream container) throws IOException {
TarArchiveEntry entry = new TarArchiveEntry(fileName);
entry.setModTime(lastModified);
entry.setSize(content.length);
container.putArchiveEntry(entry);
container.write(content);
container.closeArchiveEntry();
}
@Override
protected String getMimeType() {
return "application/x-tar";
}
@Override
protected String getFileExtension() {
return "tar";
}
@Override
protected TarArchiveOutputStream createContainer(ServletOutputStream sout, String comment) {
LOGGER.info("Constructing tar archive: {}", comment);
TarArchiveOutputStream tout = new TarArchiveOutputStream(sout, "UTF8");
tout.setBigNumberMode(TarArchiveOutputStream.BIGNUMBER_POSIX);
tout.setLongFileMode(TarArchiveOutputStream.LONGFILE_POSIX);
return tout;
}
@Override
protected void disposeContainer(TarArchiveOutputStream container) throws IOException {
container.finish();
}
}