/**
* Copyright (C) 2012-2013 Selventa, Inc.
*
* This file is part of the OpenBEL Framework.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The OpenBEL Framework 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the OpenBEL Framework. If not, see <http://www.gnu.org/licenses/>.
*
* Additional Terms under LGPL v3:
*
* This license does not authorize you and you are prohibited from using the
* name, trademarks, service marks, logos or similar indicia of Selventa, Inc.,
* or, in the discretion of other licensors or authors of the program, the
* name, trademarks, service marks, logos or similar indicia of such authors or
* licensors, in any marketing or advertising materials relating to your
* distribution of the program or any covered product. This restriction does
* not waive or limit your obligation to keep intact all copyright notices set
* forth in the program as delivered to you.
*
* If you distribute the program in whole or in part, or any modified version
* of the program, and you assume contractual liability to the recipient with
* respect to the program or modified version, then you will indemnify the
* authors and licensors of the program for any liabilities that these
* contractual assumptions directly impose on those licensors and authors.
*/
package org.openbel.framework.common.download;
import static org.openbel.framework.common.BELUtilities.asPath;
import static org.openbel.framework.common.BELUtilities.closeQuietly;
import static org.openbel.framework.common.BELUtilities.copy;
import static org.openbel.framework.common.BELUtilities.createDirectory;
import static org.openbel.framework.common.DownloadConstants.CONNECTION_TIMEOUT;
import static org.openbel.framework.common.DownloadConstants.DOWNLOAD_DIRECTORY;
import static org.openbel.framework.common.PathConstants.SHA256_EXTENSION;
import static org.openbel.framework.common.cfg.SystemConfiguration.getSystemConfiguration;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.UUID;
import org.openbel.framework.common.InvalidArgument;
/**
* FileProtocolHandler implements an {@link AbstractProtocolHandler} to
* download a resource from a {@code file://} url.
*
* @author Anthony Bargnesi {@code <abargnesi@selventa.com>}
*/
public class FileDownloadHandler implements DownloadHandler {
@Override
public DownloadFile download(URL url) throws IOException {
if (url == null) {
throw new InvalidArgument("url", url);
}
URLConnection fileUrlConnection = null;
FileOutputStream fos = null;
try {
fileUrlConnection = url.openConnection();
fileUrlConnection.setConnectTimeout(CONNECTION_TIMEOUT);
final String downloadDir = asPath(
getSystemConfiguration().getWorkingDirectory()
.getAbsolutePath(),
DOWNLOAD_DIRECTORY);
createDirectory(downloadDir);
final String filename = UUID.randomUUID().toString();
String downloadFile = asPath(downloadDir, filename);
fos = new FileOutputStream(downloadFile);
copy(fileUrlConnection.getInputStream(), fos);
// attempt to download checksum
String checksum = null;
final String checksumLocation = url.toString() + SHA256_EXTENSION;
URLConnection chksum = null;
BufferedReader br = null;
try {
URL checksumUrl = new URL(checksumLocation);
chksum = checksumUrl.openConnection();
chksum.setConnectTimeout(CONNECTION_TIMEOUT);
br = new BufferedReader(new InputStreamReader(
chksum.getInputStream()));
checksum = br.readLine();
} catch (IOException e) {
// checksum is optional, so do not propogate exception
} finally {
// close reader
closeQuietly(br);
}
return new DownloadFile(new File(downloadFile), checksum);
} finally {
// close URL and file output streams
if (fileUrlConnection != null) {
closeQuietly(fileUrlConnection.getInputStream());
}
closeQuietly(fos);
}
}
}