Github user brkyvz commented on a diff in the pull request: https://github.com/apache/spark/pull/17250#discussion_r107973850 --- Diff: external/kinesis-asl/src/main/scala/org/apache/spark/streaming/kinesis/SparkAWSCredentials.scala --- @@ -0,0 +1,179 @@ +/* + * 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.streaming.kinesis + +import scala.collection.JavaConverters._ + +import com.amazonaws.auth._ + +import org.apache.spark.annotation.InterfaceStability +import org.apache.spark.internal.Logging + +/** + * Serializable interface providing a method executors can call to obtain an + * AWSCredentialsProvider instance for authenticating to AWS services. + */ +private[kinesis] sealed trait SparkAWSCredentials extends Serializable { + /** + * Return an AWSCredentialProvider instance that can be used by the Kinesis Client + * Library to authenticate to AWS services (Kinesis, CloudWatch and DynamoDB). + */ + def provider: AWSCredentialsProvider +} + +/** Returns DefaultAWSCredentialsProviderChain for authentication. */ +private[kinesis] final case object DefaultCredentials extends SparkAWSCredentials { + + def provider: AWSCredentialsProvider = new DefaultAWSCredentialsProviderChain +} + +/** + * Returns AWSStaticCredentialsProvider constructed using basic AWS keypair. Falls back to using + * DefaultCredentialsProviderChain if unable to construct a AWSCredentialsProviderChain + * instance with the provided arguments (e.g. if they are null). + */ +private[kinesis] final case class BasicCredentials( + awsAccessKeyId: String, + awsSecretKey: String) extends SparkAWSCredentials with Logging { + + def provider: AWSCredentialsProvider = try { + new AWSStaticCredentialsProvider(new BasicAWSCredentials(awsAccessKeyId, awsSecretKey)) + } catch { + case e: IllegalArgumentException => + logWarning("Unable to construct AWSStaticCredentialsProvider with provided keypair; " + + "falling back to DefaultCredentialsProviderChain.", e) + new DefaultAWSCredentialsProviderChain + } +} + +/** + * Returns an STSAssumeRoleSessionCredentialsProvider instance which assumes an IAM + * role in order to authenticate against resources in an external account. + */ +private[kinesis] final case class STSCredentials( + stsRoleArn: String, + stsSessionName: String, + stsExternalId: Option[String] = None, + longLivedCreds: SparkAWSCredentials = DefaultCredentials) + extends SparkAWSCredentials { + + def provider: AWSCredentialsProvider = { + val builder = new STSAssumeRoleSessionCredentialsProvider.Builder(stsRoleArn, stsSessionName) + .withLongLivedCredentialsProvider(longLivedCreds.provider) + stsExternalId match { + case Some(stsExternalId) => + builder.withExternalId(stsExternalId) + .build() + case None => + builder.build() + } + } +} + +@InterfaceStability.Evolving +object SparkAWSCredentials { + /** + * Builder for [[SparkAWSCredentials]] instances. + * + * @since 2.2.0 + */ + @InterfaceStability.Evolving + class Builder { + private var basicCreds: Option[BasicCredentials] = None + private var stsCreds: Option[STSCredentials] = None + + /** + * Use a basic AWS keypair for long-lived authorization. + * + * @note The given AWS keypair will be saved in DStream checkpoints if checkpointing is + * enabled. Make sure that your checkpoint directory is secure if using the default --- End diff -- nit: `Make sure that your checkpoint directory is secure. Prefer using the [https://link.to.amazon.docs default credential provider chain]] if possible`
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