Github user HeartSaVioR commented on a diff in the pull request:
https://github.com/apache/spark/pull/22598#discussion_r224334764
--- Diff:
external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/TokenUtil.scala
---
@@ -0,0 +1,111 @@
+/*
+ * 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.sql.kafka010
+
+import java.text.SimpleDateFormat
+import java.util.Properties
+
+import org.apache.hadoop.io.Text
+import org.apache.hadoop.security.token.{Token, TokenIdentifier}
+import
org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier
+import org.apache.kafka.clients.CommonClientConfigs
+import org.apache.kafka.clients.admin.{AdminClient,
CreateDelegationTokenOptions}
+import org.apache.kafka.common.config.SaslConfigs
+import org.apache.kafka.common.security.token.delegation.DelegationToken
+
+import org.apache.spark.SparkConf
+import org.apache.spark.internal.Logging
+import org.apache.spark.internal.config._
+
+private[kafka010] object TokenUtil extends Logging {
+ private[kafka010] val TOKEN_KIND = new Text("KAFKA_DELEGATION_TOKEN")
+ private[kafka010] val TOKEN_SERVICE = new
Text("kafka.server.delegation.token")
+
+ private[kafka010] class KafkaDelegationTokenIdentifier extends
AbstractDelegationTokenIdentifier {
+ override def getKind: Text = TOKEN_KIND;
+ }
+
+ private def printToken(token: DelegationToken): Unit = {
+ if (log.isDebugEnabled) {
+ val dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm")
+ logDebug("%-15s %-30s %-15s %-25s %-15s %-15s %-15s".format(
+ "TOKENID", "HMAC", "OWNER", "RENEWERS", "ISSUEDATE", "EXPIRYDATE",
"MAXDATE"))
+ val tokenInfo = token.tokenInfo
+ logDebug("%-15s [hidden] %-15s %-25s %-15s %-15s %-15s".format(
+ tokenInfo.tokenId,
+ tokenInfo.owner,
+ tokenInfo.renewersAsString,
+ dateFormat.format(tokenInfo.issueTimestamp),
+ dateFormat.format(tokenInfo.expiryTimestamp),
+ dateFormat.format(tokenInfo.maxTimestamp)))
+ }
+ }
+
+ private[kafka010] def createAdminClientProperties(sparkConf: SparkConf):
Properties = {
+ val adminClientProperties = new Properties
+
+ val bootstrapServers = sparkConf.get(KAFKA_BOOTSTRAP_SERVERS)
+ require(bootstrapServers.nonEmpty, s"Tried to obtain kafka delegation
token but bootstrap " +
+ "servers not configured.")
+
adminClientProperties.put(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG,
bootstrapServers.get)
+
+ val protocol = sparkConf.get(KAFKA_SECURITY_PROTOCOL)
+
adminClientProperties.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG,
protocol)
+ if (protocol.endsWith("SSL")) {
+ logInfo("SSL protocol detected.")
+ sparkConf.get(KAFKA_TRUSTSTORE_LOCATION).foreach {
truststoreLocation =>
+ adminClientProperties.put("ssl.truststore.location",
truststoreLocation)
+ }
+ sparkConf.get(KAFKA_TRUSTSTORE_PASSWORD).foreach {
truststorePassword =>
+ adminClientProperties.put("ssl.truststore.password",
truststorePassword)
+ }
+ } else {
+ logWarning("Obtaining kafka delegation token through plain
communication channel. Please " +
+ "consider the security impact.")
+ }
+
+ // There are multiple possibilities to log in:
+ // - Keytab is provided -> try to log in with kerberos module using
kafka's dynamic JAAS
+ // configuration.
+ // - Keytab not provided -> try to log in with JVM global security
configuration
+ // which can be configured for example with
'java.security.auth.login.config'.
+ // For this no additional parameter needed.
+ KafkaSecurityHelper.getKeytabJaasParams(sparkConf).foreach {
jaasParams =>
+ logInfo("Keytab detected, using it for login.")
+ adminClientProperties.put(SaslConfigs.SASL_MECHANISM,
SaslConfigs.GSSAPI_MECHANISM)
+ adminClientProperties.put(SaslConfigs.SASL_JAAS_CONFIG, jaasParams)
+ }
+
+ adminClientProperties
+ }
+
+ def obtainToken(sparkConf: SparkConf): Token[_ <: TokenIdentifier] = {
--- End diff --
My 2 cents: I would rather seeing this method to upper of private methods:
while reading this class, I wonder what the private methods are doing and where
they are using, and finally reached here. There's no strict rule, as always,
but placing public methods on top and private methods on bottom often helps to
read the code sequentially. Grouping relevant methods (public & private) can
still apply orthogonally.
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