org.apache.spark.api.r.RBackendAuthHandler.scala Maven / Gradle / Ivy
/*
* 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.api.r
import java.io.{ByteArrayOutputStream, DataOutputStream}
import java.nio.charset.StandardCharsets.UTF_8
import io.netty.channel.{Channel, ChannelHandlerContext, SimpleChannelInboundHandler}
import org.apache.spark.internal.Logging
import org.apache.spark.util.Utils
/**
* Authentication handler for connections from the R process.
*/
private class RBackendAuthHandler(secret: String)
extends SimpleChannelInboundHandler[Array[Byte]] with Logging {
override def channelRead0(ctx: ChannelHandlerContext, msg: Array[Byte]): Unit = {
// The R code adds a null terminator to serialized strings, so ignore it here.
val clientSecret = new String(msg, 0, msg.length - 1, UTF_8)
try {
require(secret == clientSecret, "Auth secret mismatch.")
ctx.pipeline().remove(this)
writeReply("ok", ctx.channel())
} catch {
case e: Exception =>
logInfo("Authentication failure.", e)
writeReply("err", ctx.channel())
ctx.close()
}
}
private def writeReply(reply: String, chan: Channel): Unit = {
val out = new ByteArrayOutputStream()
SerDe.writeString(new DataOutputStream(out), reply)
chan.writeAndFlush(out.toByteArray())
}
}