feat(aws-iot): topic rules and actions

packages/@aws-cdk/aws-iot-actions/.eslintrc.js

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+const baseConfig = require('cdk-build-tools/config/eslintrc');
+baseConfig.parserOptions.project = __dirname + '/tsconfig.json';
+module.exports = baseConfig;

packages/@aws-cdk/aws-iot-actions/.gitignore

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+*.js
+*.js.map
+*.d.ts
+tsconfig.json
+node_modules
+*.generated.ts
+dist
+.jsii
+
+.LAST_BUILD
+.nyc_output
+coverage
+nyc.config.js
+.LAST_PACKAGE
+*.snk
+!.eslintrc.js
+!jest.config.js
+
+junit.xml

packages/@aws-cdk/aws-iot-actions/.npmignore

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+# Don't include original .ts files when doing `npm pack`
+*.ts
+!*.d.ts
+coverage
+.nyc_output
+*.tgz
+
+dist
+.LAST_PACKAGE
+.LAST_BUILD
+!*.js
+
+# Include .jsii
+!.jsii
+
+*.snk
+
+*.tsbuildinfo
+
+tsconfig.json
+.eslintrc.js
+jest.config.js
+
+# exclude cdk artifacts
+**/cdk.out
+junit.xml
+test/

packages/@aws-cdk/aws-iot-actions/LICENSE

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packages/@aws-cdk/aws-iot-actions/NOTICE

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+AWS Cloud Development Kit (AWS CDK)
+Copyright 2018-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.

packages/@aws-cdk/aws-iot-actions/README.md

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+# AWS IoT Construct Library
+<!--BEGIN STABILITY BANNER-->
+
+---
+
+![cfn-resources: Stable](https://img.shields.io/badge/cfn--resources-stable-success.svg?style=for-the-badge)
+
+> All classes with the `Cfn` prefix in this module ([CFN Resources]) are always stable and safe to use.
+>
+> [CFN Resources]: https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib
+
+![cdk-constructs: Experimental](https://img.shields.io/badge/cdk--constructs-experimental-important.svg?style=for-the-badge)
+
+> The APIs of higher level constructs in this module are experimental and under active development.
+> They are subject to non-backward compatible changes or removal in any future version. These are
+> not subject to the [Semantic Versioning](https://semver.org/) model and breaking changes will be
+> announced in the release notes. This means that while you may use them, you may need to update
+> your source code when upgrading to a newer version of this package.
+
+---
+
+<!--END STABILITY BANNER-->
+
+This module contains integration classes to add actions to IoT Topic Rules.
+Instances of these classes should be passed to the `rule.addAction()` method.
+
+Currently supported are:
+  [Lambda](https://docs.aws.amazon.com/iot/latest/developerguide/lambda-rule-action.html)
+
+See the README of `@aws-cdk/aws-iot` for more information.

packages/@aws-cdk/aws-iot-actions/jest.config.js

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+const baseConfig = require('cdk-build-tools/config/jest.config');
+module.exports = baseConfig;

packages/@aws-cdk/aws-iot-actions/lib/index.ts

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+export * from './lambda';
+export * from './republish';
+export * from './sns';
+export * from './sqs';

packages/@aws-cdk/aws-iot-actions/lib/lambda.ts

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+import * as iam from '@aws-cdk/aws-iam';
+import * as iot from '@aws-cdk/aws-iot';
+import * as lambda from '@aws-cdk/aws-lambda';
+import * as cdk from '@aws-cdk/core';
+
+/**
+ * Calls an AWS Lambda function
+ */
+export class LambdaFunction implements iot.ITopicRuleAction {
+  constructor(private readonly handler: lambda.IFunction) {
+  }
+
+  public bind(rule: iot.ITopicRule): iot.TopicRuleActionConfig {
+    // Allow rule to invoke lambda function
+    const permissionId = 'AllowIot';
+    if (!this.handler.permissionsNode.tryFindChild(permissionId)) {
+      this.handler.addPermission(permissionId, {
+        action: 'lambda:InvokeFunction',
+        principal: new iam.ServicePrincipal('iot.amazonaws.com'),
+        sourceAccount: cdk.Aws.ACCOUNT_ID,
+      });
+    }
+
+    // Ensure permission is deployed before rule
+    const permission = this.handler.permissionsNode.tryFindChild(permissionId) as lambda.CfnPermission;
+    if (permission) {
+      rule.node.addDependency(permission);
+    } else {
+      // tsling:disable-next-line:max-line-length
+      rule.node.addWarning('This rule is using a Lambda action with an imported function. Ensure permssion is given to IOT to invoke that function.');
+    }
+
+    return {
+      lambda: {
+        functionArn: this.handler.functionArn,
+      },
+    };
+  }
+}

packages/@aws-cdk/aws-iot-actions/lib/republish.ts

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+import * as iam from '@aws-cdk/aws-iam';
+import * as iot from '@aws-cdk/aws-iot';
+import { singletonTopicRuleRole } from './util';
+
+/**
+ * Construction properties for a Republish action.
+ */
+export interface RepublishProps {
+  /**
+   * The name of the MQTT topic
+   */
+  readonly topic: string;
+  /**
+   * The Quality of Service (Qos) level to use when republishing messages.
+   *
+   * @default - 0
+   */
+  readonly qos?: number;
+  /**
+   * The IAM role that grants access.
+   *
+   * @default - a role will be created
+   */
+  readonly role?: iam.IRole;
+}
+
+/**
+ * Publishes to a IoT Topic
+ */
+export class RepublishTopic implements iot.ITopicRuleAction {
+  constructor(private readonly topic: iot.ITopicRule, private readonly props: RepublishProps) {
+  }
+
+  public bind(rule: iot.ITopicRule): iot.TopicRuleActionConfig {
+    // Allow rule to publish to topic
+    const role = this.props.role || singletonTopicRuleRole(rule, []);
+    this.topic.grantPublish(role, this.props.topic);
+
+    return {
+      republish: {
+        qos: this.props.qos || 0,
+        topic: this.props.topic,
+        roleArn: role.roleArn,
+      },
+    };
+  }
+}