[aws-events-targets] Add CDK support for Event Bridge Firehose target

[cheruvian]

AWS Event Bridge supports Firehose target, but that is missing from the CDK constructs. This is not the same as Kinesis stream since it uses different permissions and is a different L1 CDK construct.

Use Case

Use Firehose with Event Bridge in the CDK.

Proposed Solution

Add the following:

import * as events from '@aws-cdk/aws-events';
import { singletonEventRole } from '@aws-cdk/aws-events-targets/lib/util'
import { CfnDeliveryStream } from '@aws-cdk/aws-kinesisfirehose'
import * as iam from '@aws-cdk/aws-iam';


/**
 * Customize the Kinesis Stream Event Target
 */
export interface FirehoseStreamProps {
  /**
   * The message to send to the stream.
   *
   * Must be a valid JSON text passed to the target stream.
   *
   * @default - the entire CloudWatch event
   */
  readonly message?: events.RuleTargetInput;
}


export class FirehoseStream implements events.IRuleTarget {

  constructor(private readonly stream: CfnDeliveryStream, private readonly props: FirehoseStreamProps = {}) {
  }

  /**
   * Returns a RuleTarget that can be used to trigger this Kinesis Stream as a
   * result from a CloudWatch event.
   */
  public bind(_rule: events.IRule, _id?: string): events.RuleTargetConfig {
    const policyStatements = [new iam.PolicyStatement({
      actions: ['firehose:PutRecord', 'firehose:PutRecordBatch'],
      resources: [this.stream.attrArn],
    })];

    return {
      id: '',
      arn: this.stream.attrArn,
      role: singletonEventRole(this.stream, policyStatements),
      input: this.props.message,
      targetResource: this.stream
    };
  }
}

Other

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

---

This is a 🚀 Feature Request

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