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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 com.att.research.datarouter.provisioning;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Properties;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONTokener;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
import com.att.research.datarouter.provisioning.beans.EventLogRecord;
import com.att.research.datarouter.provisioning.beans.Feed;
import com.att.research.datarouter.provisioning.beans.IngressRoute;
import com.att.research.datarouter.provisioning.eelf.EelfMsgs;
import com.att.research.datarouter.provisioning.utils.*;
/**
* This servlet handles redirects for the <publishURL> on the provisioning server,
* which is generated by the provisioning server to handle a particular subscriptions to a feed.
* See the <b>File Publishing and Delivery API</b> document for details on how these methods
* should be invoked.
*
* @author Robert Eby
* @version $Id: PublishServlet.java,v 1.8 2014/03/12 19:45:41 eby Exp $
*/
@SuppressWarnings("serial")
public class PublishServlet extends BaseServlet {
private int next_node;
private String provstring;
private List<IngressRoute> irt;
//Adding EELF Logger Rally:US664892
private static EELFLogger eelflogger = EELFManager.getInstance().getLogger("com.att.research.datarouter.provisioning.PublishServlet");
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
next_node = 0;
provstring = "";
irt = new ArrayList<IngressRoute>();
}
@Override
public void doDelete(HttpServletRequest req, HttpServletResponse resp) throws IOException {
setIpAndFqdnForEelf("doDelete");
eelflogger.info(EelfMsgs.MESSAGE_WITH_BEHALF_AND_FEEDID, req.getHeader(BEHALF_HEADER),getIdFromPath(req)+"");
redirect(req, resp);
}
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
setIpAndFqdnForEelf("doGet");
eelflogger.info(EelfMsgs.MESSAGE_WITH_BEHALF_AND_FEEDID, req.getHeader(BEHALF_HEADER),getIdFromPath(req)+"");
redirect(req, resp);
}
@Override
public void doPut(HttpServletRequest req, HttpServletResponse resp) throws IOException {
setIpAndFqdnForEelf("doPut");
eelflogger.info(EelfMsgs.MESSAGE_WITH_BEHALF_AND_FEEDID, req.getHeader(BEHALF_HEADER),getIdFromPath(req)+"");
redirect(req, resp);
}
@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
setIpAndFqdnForEelf("doPost");
eelflogger.info(EelfMsgs.MESSAGE_WITH_BEHALF, req.getHeader(BEHALF_HEADER));
redirect(req, resp);
}
private void redirect(HttpServletRequest req, HttpServletResponse resp) throws IOException {
String[] nodes = getNodes();
if (nodes == null || nodes.length == 0) {
resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE, "There are no nodes defined in the DR network.");
} else {
EventLogRecord elr = new EventLogRecord(req);
int feedid = checkPath(req);
if (feedid < 0) {
String message = (feedid == -1)
? "Invalid request - Missing or bad feed number."
: "Invalid request - Missing file ID.";
elr.setMessage(message);
elr.setResult(HttpServletResponse.SC_NOT_FOUND);
eventlogger.info(elr);
resp.sendError(HttpServletResponse.SC_NOT_FOUND, message);
} else {
// Generate new URL
String nextnode = getRedirectNode(feedid, req);
nextnode = nextnode+":"+DB.HTTPS_PORT;
String newurl = "https://" + nextnode + "/publish" + req.getPathInfo();
String qs = req.getQueryString();
if (qs != null)
newurl += "?" + qs;
// Log redirect in event log
String message = "Redirected to: "+newurl;
elr.setMessage(message);
elr.setResult(HttpServletResponse.SC_MOVED_PERMANENTLY);
eventlogger.info(elr);
resp.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
resp.setHeader("Location", newurl);
}
}
}
private String getRedirectNode(int feedid, HttpServletRequest req) {
// Check to see if the IRT needs to be updated
Poker p = Poker.getPoker();
String s = p.getProvisioningString();
synchronized (provstring) {
if (irt == null || (s.length() != provstring.length()) || !s.equals(provstring)) {
// Provisioning string has changed -- update the IRT
provstring = s;
JSONObject jo = new JSONObject(new JSONTokener(provstring));
JSONArray ja = jo.getJSONArray("ingress");
List<IngressRoute> newlist = new ArrayList<IngressRoute>();
for (int i = 0; i < ja.length(); i++) {
IngressRoute iroute = new IngressRoute(ja.getJSONObject(i));
newlist.add(iroute);
}
irt = newlist;
}
}
// Look in IRT for next node
for (IngressRoute route : irt) {
if (route.matches(feedid, req)) {
// pick a node at random from the list
Collection<String> nodes = route.getNodes();
String[] arr = nodes.toArray(new String[0]);
long id = System.currentTimeMillis() % arr.length;
String node = arr[(int) id];
intlogger.info("Redirecting to "+node+" because of route "+route);
return node;
}
}
// No IRT rule matches, do round robin of all active nodes
String[] nodes = getNodes();
if (next_node >= nodes.length) // The list of nodes may have grown/shrunk
next_node = 0;
return nodes[next_node++];
}
private int checkPath(HttpServletRequest req) {
String path = req.getPathInfo();
if (path == null || path.length() < 2)
return -1;
path = path.substring(1);
int ix = path.indexOf('/');
if (ix < 0 || ix == path.length()-1)
return -2;
try {
int feedid = Integer.parseInt(path.substring(0, ix));
if (!Feed.isFeedValid(feedid))
return -1;
return feedid;
} catch (NumberFormatException e) {
return -1;
}
}
}
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