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/*
* 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.spark.deploy.yarn
import javax.servlet._
import javax.servlet.http.{HttpServletRequest, HttpServletResponse}
import org.apache.spark.internal.Logging
/**
* A filter to be used in the Spark History Server for redirecting YARN proxy requests to the
* main SHS address. This is useful for applications that are using the history server as the
* tracking URL, since the SHS-generated pages cannot be rendered in that case without extra
* configuration to set up a proxy base URI (meaning the SHS cannot be ever used directly).
*/
class YarnProxyRedirectFilter extends Filter with Logging {
import YarnProxyRedirectFilter._
override def destroy(): Unit = { }
override def init(config: FilterConfig): Unit = { }
override def doFilter(req: ServletRequest, res: ServletResponse, chain: FilterChain): Unit = {
val hreq = req.asInstanceOf[HttpServletRequest]
// The YARN proxy will send a request with the "proxy-user" cookie set to the YARN's client
// user name. We don't expect any other clients to set this cookie, since the SHS does not
// use cookies for anything.
Option(hreq.getCookies()).flatMap(_.find(_.getName() == COOKIE_NAME)) match {
case Some(_) =>
doRedirect(hreq, res.asInstanceOf[HttpServletResponse])
case _ =>
chain.doFilter(req, res)
}
}
private def doRedirect(req: HttpServletRequest, res: HttpServletResponse): Unit = {
val redirect = req.getRequestURL().toString()
// Need a client-side redirect instead of an HTTP one, otherwise the YARN proxy itself
// will handle the redirect and get into an infinite loop.
val content = s"""
|<html xmlns="http://www.w3.org/1999/xhtml">
|<head>
| <title>Spark History Server Redirect</title>
| <meta http-equiv="refresh" content="0;URL='$redirect'" />
|</head>
|<body>
| <p>The requested page can be found at: <a href="$redirect">$redirect</a>.</p>
|</body>
|</html>
""".stripMargin
logDebug(s"Redirecting YARN proxy request to $redirect.")
res.setStatus(HttpServletResponse.SC_OK)
res.setContentType("text/html")
res.getWriter().write(content)
}
}
private[spark] object YarnProxyRedirectFilter {
val COOKIE_NAME = "proxy-user"
}
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