/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.slider.server.appmaster.web;
import org.apache.hadoop.yarn.server.webproxy.WebAppProxyServlet;
import org.apache.hadoop.yarn.server.webproxy.amfilter.AmIpPrincipal;
import org.apache.hadoop.yarn.server.webproxy.amfilter.AmIpServletRequestWrapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.HashSet;
import java.util.Set;
public class SliderAmIpFilter implements Filter {
protected static final Logger log =
LoggerFactory.getLogger(SliderAmIpFilter.class);
public static final String PROXY_HOST = "PROXY_HOST";
public static final String PROXY_URI_BASE = "PROXY_URI_BASE";
//update the proxy IP list about every 5 min
private static final long updateInterval = 5 * 60 * 1000;
public static final String WS_CONTEXT_ROOT = "slider.rest.context.root";
private String proxyHost;
private Set<String> proxyAddresses = null;
private long lastUpdate;
private String proxyUriBase;
private String wsContextRoot;
@Override
public void init(FilterConfig conf) throws ServletException {
proxyHost = conf.getInitParameter(PROXY_HOST);
proxyUriBase = conf.getInitParameter(PROXY_URI_BASE);
wsContextRoot = conf.getInitParameter(WS_CONTEXT_ROOT);
}
protected Set<String> getProxyAddresses() throws ServletException {
long now = System.currentTimeMillis();
synchronized(this) {
if(proxyAddresses == null || (lastUpdate + updateInterval) >= now) {
try {
proxyAddresses = new HashSet<>();
for(InetAddress add : InetAddress.getAllByName(proxyHost)) {
if (log.isDebugEnabled()) {
log.debug("proxy address is: " + add.getHostAddress());
}
proxyAddresses.add(add.getHostAddress());
}
lastUpdate = now;
} catch (UnknownHostException e) {
throw new ServletException("Could not locate "+proxyHost, e);
}
}
return proxyAddresses;
}
}
@Override
public void destroy() {
//Empty
}
@Override
public void doFilter(ServletRequest req, ServletResponse resp,
FilterChain chain) throws IOException, ServletException {
if(!(req instanceof HttpServletRequest)) {
throw new ServletException("This filter only works for HTTP/HTTPS");
}
HttpServletRequest httpReq = (HttpServletRequest)req;
HttpServletResponse httpResp = (HttpServletResponse)resp;
if (log.isDebugEnabled()) {
log.debug("Remote address for request is: " + httpReq.getRemoteAddr());
}
String requestURI = httpReq.getRequestURI();
if(!requestURI.startsWith(wsContextRoot) &&
!getProxyAddresses().contains(httpReq.getRemoteAddr())) {
String redirectUrl = httpResp.encodeRedirectURL(proxyUriBase +
requestURI);
httpResp.sendRedirect(redirectUrl);
return;
}
String user = null;
if (httpReq.getCookies() != null) {
for(Cookie c: httpReq.getCookies()) {
if(WebAppProxyServlet.PROXY_USER_COOKIE_NAME.equals(c.getName())){
user = c.getValue();
break;
}
}
}
try {
if (user == null) {
log.warn("Could not find " + WebAppProxyServlet.PROXY_USER_COOKIE_NAME
+ " cookie, so user will not be set");
chain.doFilter(req, resp);
} else {
final AmIpPrincipal principal = new AmIpPrincipal(user);
ServletRequest requestWrapper = new AmIpServletRequestWrapper(httpReq,
principal);
chain.doFilter(requestWrapper, resp);
}
} catch (IOException | ServletException e) {
log.warn("When fetching {}: {}", requestURI, e);
throw e;
}
}
}