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/*******************************************************************************
* ============LICENSE_START==================================================
* * org.onap.dmaap
* * ===========================================================================
* * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* * ===========================================================================
* * 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.
* * ============LICENSE_END====================================================
* *
* * ECOMP is a trademark and service mark of AT&T Intellectual Property.
* *
******************************************************************************/
package org.onap.dmaap.datarouter.subscriber;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URLEncoder;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.codec.binary.Base64;
import org.apache.log4j.Logger;
public class SampleSubscriberServlet extends HttpServlet {
private static Logger logger = Logger.getLogger("org.onap.dmaap.datarouter.subscriber.SampleSubscriberServlet");
private static String outputDirectory;
private static String basicAuth;
/**
* Configure the SampleSubscriberServlet.
*
* <ul>
* <li>Login - The login expected in the Authorization header (default "LOGIN").
* <li>Password - The password expected in the Authorization header (default "PASSWORD").
* <li>outputDirectory - The directory where files are placed (default
* "/opt/app/subscriber/delivery").
* </ul>
*/
@Override
public void init() {
SubscriberProps props = SubscriberProps.getInstance();
String login = props.getValue("org.onap.dmaap.datarouter.subscriber.auth.user", "LOGIN");
String password = props.getValue("org.onap.dmaap.datarouter.subscriber.auth.password", "PASSWORD");
outputDirectory =
props.getValue("org.onap.dmaap.datarouter.subscriber.delivery.dir", "/opt/app/subscriber/delivery");
try {
Files.createDirectory(Paths.get(outputDirectory));
} catch (IOException e) {
logger.info("SubServlet: Failed to create delivery dir: " + e.getMessage(), e);
}
basicAuth = "Basic " + Base64.encodeBase64String((login + ":" + password).getBytes());
}
@Override
protected void doPut(HttpServletRequest req, HttpServletResponse resp) {
try {
common(req, resp, false);
} catch (IOException e) {
logger.info("SampleSubServlet: Failed to doPut: " + req.getRemoteAddr() + " : " + req.getPathInfo(), e);
}
}
@Override
protected void doDelete(HttpServletRequest req, HttpServletResponse resp) {
try {
common(req, resp, true);
} catch (IOException e) {
logger.info("SampleSubServlet: Failed to doDelete: " + req.getRemoteAddr() + " : " + req.getPathInfo(), e);
}
}
/**
* Process a PUT or DELETE request.
*
* <ol>
* <li>Verify that the request contains an Authorization header or else UNAUTHORIZED.
* <li>Verify that the Authorization header matches the configured Login and Password or else
* FORBIDDEN.
* <li>If the request is PUT, store the message body as a file in the configured outputDirectory
* directory protecting against evil characters in the received FileID. The file is created
* initially with its name prefixed with a ".", and once it is complete, it is renamed to
* remove the leading "." character.
* <li>If the request is DELETE, instead delete the file (if it exists) from the configured
* outputDirectory directory.
* <li>Respond with NO_CONTENT.
* </ol>
*/
private void common(HttpServletRequest req, HttpServletResponse resp, boolean isdelete) throws IOException {
String authHeader = req.getHeader("Authorization");
if (authHeader == null) {
logger.info("SampleSubServlet: Rejecting request with no Authorization header from " + req.getRemoteAddr()
+ ": " + req.getPathInfo());
resp.sendError(HttpServletResponse.SC_UNAUTHORIZED);
return;
}
if (!basicAuth.equals(authHeader)) {
logger.info("SampleSubServlet: Rejecting request with incorrect Authorization header from "
+ req.getRemoteAddr() + ": " + req.getPathInfo());
resp.sendError(HttpServletResponse.SC_FORBIDDEN);
return;
}
String fileid = req.getPathInfo();
fileid = fileid.substring(fileid.lastIndexOf('/') + 1);
String queryString = req.getQueryString();
if (queryString != null) {
fileid = fileid + "?" + queryString;
}
String publishid = req.getHeader("X-DMAAP-DR-PUBLISH-ID");
String filename = URLEncoder.encode(fileid, "UTF-8").replaceAll("^\\.", "%2E").replaceAll("\\*", "%2A");
String fullPath = outputDirectory + "/" + filename;
String tmpPath = outputDirectory + "/." + filename;
String fullMetaDataPath = outputDirectory + "/" + filename + ".M";
String tmpMetaDataPath = outputDirectory + "/." + filename + ".M";
try {
if (isdelete) {
Files.deleteIfExists(Paths.get(fullPath));
Files.deleteIfExists(Paths.get(fullMetaDataPath));
logger.info("SampleSubServlet: Received delete for file id " + fileid + " from " + req.getRemoteAddr()
+ " publish id " + publishid + " as " + fullPath);
} else {
new File(tmpPath).createNewFile();
new File(tmpMetaDataPath).createNewFile();
try (InputStream is = req.getInputStream(); OutputStream os = new FileOutputStream(tmpPath)) {
byte[] buf = new byte[65536];
int bufferSize;
while ((bufferSize = is.read(buf)) > 0) {
os.write(buf, 0, bufferSize);
}
}
Files.move(Paths.get(tmpPath), Paths.get(fullPath), StandardCopyOption.REPLACE_EXISTING);
try (PrintWriter writer = new PrintWriter(new FileOutputStream(tmpMetaDataPath))) {
String metaData = req.getHeader("X-DMAAP-DR-META");
writer.print(metaData);
}
Files.move(Paths.get(tmpMetaDataPath), Paths.get(fullMetaDataPath),
StandardCopyOption.REPLACE_EXISTING);
logger.info(
"SampleSubServlet: Received file id " + fileid + " from " + req.getRemoteAddr() + " publish id "
+ publishid + " as " + fullPath);
resp.setStatus(HttpServletResponse.SC_NO_CONTENT);
}
resp.setStatus(HttpServletResponse.SC_NO_CONTENT);
} catch (IOException ioe) {
Files.deleteIfExists(Paths.get(tmpPath));
Files.deleteIfExists(Paths.get(tmpMetaDataPath));
logger.info("SampleSubServlet: Failed to process file " + fullPath + " from " + req.getRemoteAddr() + ": "
+ req.getPathInfo());
throw ioe;
}
}
}
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