/**
  * 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.
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package kafka.api

import java.util

import kafka.server.KafkaConfig
import kafka.utils.{JaasTestUtils, TestUtils}
import kafka.zk.ConfigEntityChangeNotificationZNode
import org.apache.kafka.clients.admin.{AdminClient, AdminClientConfig}
import org.apache.kafka.common.config.SaslConfigs
import org.apache.kafka.common.security.auth.SecurityProtocol
import org.apache.kafka.common.security.scram.ScramCredential
import org.apache.kafka.common.security.scram.internals.ScramMechanism
import org.apache.kafka.common.security.token.delegation.DelegationToken
import org.junit.Before

import scala.collection.JavaConverters._

class DelegationTokenEndToEndAuthorizationTest extends EndToEndAuthorizationTest {

  val kafkaClientSaslMechanism = "SCRAM-SHA-256"
  val kafkaServerSaslMechanisms = ScramMechanism.mechanismNames.asScala.toList
  override protected def securityProtocol = SecurityProtocol.SASL_SSL
  override protected val serverSaslProperties = Some(kafkaServerSaslProperties(kafkaServerSaslMechanisms, kafkaClientSaslMechanism))
  override protected val clientSaslProperties = Some(kafkaClientSaslProperties(kafkaClientSaslMechanism))

  override val clientPrincipal = JaasTestUtils.KafkaScramUser
  private val clientPassword = JaasTestUtils.KafkaScramPassword

  override val kafkaPrincipal = JaasTestUtils.KafkaScramAdmin
  private val kafkaPassword = JaasTestUtils.KafkaScramAdminPassword

  this.serverConfig.setProperty(KafkaConfig.DelegationTokenMasterKeyProp, "testKey")

  override def configureSecurityBeforeServersStart() {
    super.configureSecurityBeforeServersStart()
    zkClient.makeSurePersistentPathExists(ConfigEntityChangeNotificationZNode.path)
    // Create broker admin credentials before starting brokers
    createScramCredentials(zkConnect, kafkaPrincipal, kafkaPassword)
  }

  override def configureSecurityAfterServersStart() {
    super.configureSecurityAfterServersStart()

    // create scram credential for user "scram-user"
    createScramCredentials(zkConnect, clientPrincipal, clientPassword)
    waitForScramCredentials(clientPrincipal)

    //create a token with "scram-user" credentials
    val token = createDelegationToken()

    // pass token to client jaas config
    val clientLoginContext = JaasTestUtils.tokenClientLoginModule(token.tokenInfo().tokenId(), token.hmacAsBase64String())
    producerConfig.put(SaslConfigs.SASL_JAAS_CONFIG, clientLoginContext)
    consumerConfig.put(SaslConfigs.SASL_JAAS_CONFIG, clientLoginContext)
  }

  private def waitForScramCredentials(clientPrincipal: String): Unit = {
    servers.foreach { server =>
      val cache = server.credentialProvider.credentialCache.cache(kafkaClientSaslMechanism, classOf[ScramCredential])
      TestUtils.waitUntilTrue(() => cache.get(clientPrincipal) != null, s"SCRAM credentials not created for $clientPrincipal")
    }
  }

  @Before
  override def setUp() {
    startSasl(jaasSections(kafkaServerSaslMechanisms, Option(kafkaClientSaslMechanism), Both))
    super.setUp()
  }

  private def createDelegationToken(): DelegationToken = {
    val config = new util.HashMap[String, Object]
    config.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, brokerList)
    val securityProps: util.Map[Object, Object] =
      TestUtils.adminClientSecurityConfigs(securityProtocol, trustStoreFile, clientSaslProperties)
    securityProps.asScala.foreach { case (key, value) => config.put(key.asInstanceOf[String], value) }
    val clientLoginContext = jaasClientLoginModule(kafkaClientSaslMechanism)
    config.put(SaslConfigs.SASL_JAAS_CONFIG, clientLoginContext)

    val adminClient = AdminClient.create(config)
    try {
      val token = adminClient.createDelegationToken().delegationToken().get()
      //wait for token to reach all the brokers
      TestUtils.waitUntilTrue(() => servers.forall(server => !server.tokenCache.tokens().isEmpty),
        "Timed out waiting for token to propagate to all servers")
      token
    } finally {
      adminClient.close()
    }
  }
}
