feat(aws-sns-sqs): New aws-sns-sqs pattern implementation

source/patterns/@aws-solutions-constructs/aws-sns-sqs/.eslintignore

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+lib/*.js
+test/*.js
+*.d.ts
+coverage
+test/lambda/index.js

source/patterns/@aws-solutions-constructs/aws-sns-sqs/.gitignore

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+lib/*.js
+test/*.js
+*.js.map
+*.d.ts
+node_modules
+*.generated.ts
+dist
+.jsii
+
+.LAST_BUILD
+.nyc_output
+coverage
+.nycrc
+.LAST_PACKAGE
+*.snk

source/patterns/@aws-solutions-constructs/aws-sns-sqs/.npmignore

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+# Exclude typescript source and config
+*.ts
+tsconfig.json
+coverage
+.nyc_output
+*.tgz
+*.snk
+*.tsbuildinfo
+
+# Include javascript files and typescript declarations
+!*.js
+!*.d.ts
+
+# Exclude jsii outdir
+dist
+
+# Include .jsii
+!.jsii
+
+# Include .jsii
+!.jsii

source/patterns/@aws-solutions-constructs/aws-sns-sqs/README.md

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+# aws-sns-sqs module
+<!--BEGIN STABILITY BANNER-->
+
+---
+
+![Stability: Experimental](https://img.shields.io/badge/stability-Experimental-important.svg?style=for-the-badge)
+
+> All classes are under active development and subject to non-backward compatible changes or removal in any
+> future version. These are not subject to the [Semantic Versioning](https://semver.org/) model.
+> This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.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-->
+
+| **Reference Documentation**:| <span style="font-weight: normal">https://docs.aws.amazon.com/solutions/latest/constructs/</span>|
+|:-------------|:-------------|
+<div style="height:8px"></div>
+
+| **Language**     | **Package**        |
+|:-------------|-----------------|
+|![Python Logo](https://docs.aws.amazon.com/cdk/api/latest/img/python32.png) Python|`aws_solutions_constructs.aws_sns_sqs`|
+|![Typescript Logo](https://docs.aws.amazon.com/cdk/api/latest/img/typescript32.png) Typescript|`@aws-solutions-constructs/aws-sns-sqs`|
+|![Java Logo](https://docs.aws.amazon.com/cdk/api/latest/img/java32.png) Java|`software.amazon.awsconstructs.services.snssqs`|
+
+This AWS Solutions Construct implements an Amazon SNS topic connected to an Amazon SQS queue.
+
+Here is a minimal deployable pattern definition:
+
+``` javascript
+const { SnsToSqs } = require('@aws-solutions-constructs/aws-sns-sqs');
+
+const props: SnsToSqsProps = {};
+
+new SnsToSqs(stack, 'SnsToSqsPattern', props);
+
+```
+
+## Initializer
+
+``` text
+new SnsToSqs(scope: Construct, id: string, props: SnsToSqsProps);
+```
+
+_Parameters_
+
+* scope [`Construct`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_core.Construct.html)
+* id `string`
+* props [`SnsToSqsProps`](#pattern-construct-props)
+
+## Pattern Construct Props
+
+| **Name**     | **Type**        | **Description** |
+|:-------------|:----------------|-----------------|
+|existingTopicObj?|[`sns.Topic`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-sns.Topic.html)|An optional, existing SNS topic to be used instead of the default topic. If an existing topic is provided, the `topicProps` property will be ignored.|
+|topicProps?|[`sns.TopicProps`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-sns.TopicProps.html)|Optional user provided properties to override the default properties for the SNS topic.|
+|existingQueueObj?|[`sqs.Queue`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-sqs.Queue.html)|An optional, existing SQS queue to be used instead of the default queue. If an existing queue is provided, the `queueProps` property will be ignored.|
+|queueProps?|[`sqs.QueueProps`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-sqs.QueueProps.html)|Optional user provided properties to override the default properties for the SQS queue.|
+|deployDeadLetterQueue?|`boolean`|Whether to create a secondary queue to be used as a dead letter queue. Defaults to true.|
+|deadLetterQueueProps?|[`sqs.QueueProps`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-sqs.QueueProps.html)|Optional user-provided props to override the default props for the dead letter SQS queue.|
+|maxReceiveCount?|`number`|The number of times a message can be unsuccessfully dequeued before being moved to the dead letter queue. Defaults to 15.|
+|enableEncryptionWithCustomerManagedKey?|`boolean`|Use a KMS Key, either managed by this CDK app, or imported. If importing an encryption key, it must be specified in the encryptionKey property for this construct.|
+|encryptionKey?|[`kms.Key`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-kms.Key.html)|An optional, imported encryption key to encrypt the SQS queue, and SNS Topic.|
+|encryptionKeyProps?|[`kms.KeyProps`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-kms.KeyProps.html)|An optional, user provided properties to override the default properties for the KMS encryption key.|
+
+## Pattern Properties
+
+| **Name**     | **Type**        | **Description** |
+|:-------------|:----------------|-----------------|
+|snsTopic|[`sns.Topic`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-sns.Topic.html)|Returns an instance of the SNS topic created by the pattern.|
+|encryptionKey|[`kms.Key`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-kms.Key.html)|Returns an instance of kms.Key used for the SQS queue, and SNS Topic.|
+|sqsQueue|[`sqs.Queue`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-sqs.Queue.html)|Returns an instance of the SQS queue created by the pattern.|
+|deadLetterQueue?|[`sqs.Queue`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-sqs.Queue.html)|Returns an instance of the dead-letter SQS queue created by the pattern.|
+
+## Default settings
+
+Out of the box implementation of the Construct without any override will set the following defaults:
+
+### Amazon SNS Topic
+* Configure least privilege access permissions for SNS Topic
+* Enable server-side encryption for SNS Topic using Customer managed KMS Key
+* Enforce encryption of data in transit
+
+### Amazon SQS Queue
+* Configure least privilege access permissions for SQS Queue
+* Deploy SQS dead-letter queue for the source SQS Queue
+* Enable server-side encryption for SQS Queue using Customer managed KMS Key
+* Enforce encryption of data in transit
+
+## Architecture
+![Architecture Diagram](architecture.png)
+
+***
+&copy; Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.

source/patterns/@aws-solutions-constructs/aws-sns-sqs/lib/index.ts

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+/**
+ *  Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance
+ *  with the License. A copy of the License is located at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  or in the 'license' file accompanying this file. This file is distributed on an 'AS IS' BASIS, WITHOUT WARRANTIES
+ *  OR CONDITIONS OF ANY KIND, express or implied. See the License for the specific language governing permissions
+ *  and limitations under the License.
+ */
+
+// Imports
+import * as sqs from '@aws-cdk/aws-sqs';
+import * as sns from '@aws-cdk/aws-sns';
+import * as subscriptions from '@aws-cdk/aws-sns-subscriptions';
+import * as kms from '@aws-cdk/aws-kms';
+import * as iam from '@aws-cdk/aws-iam';
+import * as defaults from '@aws-solutions-constructs/core';
+import { Construct } from '@aws-cdk/core';
+import {buildEncryptionKey} from "@aws-solutions-constructs/core";
+
+/**
+ * @summary The properties for the SnsToSqs class.
+ */
+export interface SnsToSqsProps {
+    /**
+     * Existing instance of SNS topic object, if this is set then topicProps is ignored.
+     *
+     * @default - Default props are used
+     */
+    readonly existingTopicObj?: sns.Topic,
+    /**
+     * Optional user provided properties to override the default properties for the SNS topic.
+     *
+     * @default - Default properties are used.
+     */
+    readonly topicProps?: sns.TopicProps,
+    /**
+     * Existing instance of SQS queue object, if this is set then queueProps is ignored.
+     *
+     * @default - Default props are used
+     */
+    readonly existingQueueObj?: sqs.Queue,
+    /**
+     * Optional user provided properties
+     *
+     * @default - Default props are used
+     */
+    readonly queueProps?: sqs.QueueProps,
+    /**
+     * Optional user provided properties for the dead letter queue
+     *
+     * @default - Default props are used
+     */
+    readonly deadLetterQueueProps?: sqs.QueueProps,
+    /**
+     * Whether to deploy a secondary queue to be used as a dead letter queue.
+     *
+     * @default - true.
+     */
+    readonly deployDeadLetterQueue?: boolean,
+    /**
+     * The number of times a message can be unsuccessfully dequeued before being moved to the dead-letter queue.
+     *
+     * @default - required field if deployDeadLetterQueue=true.
+     */
+    readonly maxReceiveCount?: number
+    /**
+     * Use a KMS Key, either managed by this CDK app, or imported. If importing an encryption key, it must be specified in
+     * the encryptionKey property for this construct.
+     *
+     * @default - true (encryption enabled, managed by this CDK app).
+     */
+    readonly enableEncryptionWithCustomerManagedKey?: boolean
+    /**
+     * An optional, imported encryption key to encrypt the SQS queue, and SNS Topic.
+     *
+     * @default - not specified.
+     */
+    readonly encryptionKey?: kms.Key
+    /**
+     * Optional user-provided props to override the default props for the encryption key.
+     *
+     * @default - Default props are used.
+     */
+    readonly encryptionKeyProps?: kms.KeyProps
+}
+
+/**
+ * @summary The SnsToSqs class.
+ */
+export class SnsToSqs extends Construct {
+    public readonly snsTopic: sns.Topic;
+    public readonly encryptionKey?: kms.Key;
+    public readonly sqsQueue: sqs.Queue;
+    public readonly deadLetterQueue?: sqs.DeadLetterQueue;
+
+    /**
+     * @summary Constructs a new instance of the SnsToSqs class.
+     * @param {cdk.App} scope - represents the scope for all the resources.
+     * @param {string} id - this is a a scope-unique id.
+     * @param {SnsToSqsProps} props - user provided props for the construct.
+     * @since 1.61.0
+     * @access public
+     */
+    constructor(scope: Construct, id: string, props: SnsToSqsProps) {
+        super(scope, id);
+
+        // Setup the dead letter queue, if applicable
+        if (props.deployDeadLetterQueue || props.deployDeadLetterQueue === undefined) {
+            const dlq: sqs.Queue = defaults.buildQueue(this, 'deadLetterQueue', {
+                queueProps: props.deadLetterQueueProps
+            });
+            this.deadLetterQueue = defaults.buildDeadLetterQueue({
+                deadLetterQueue: dlq,
+                maxReceiveCount: props.maxReceiveCount
+            });
+        }
+
+        let enableEncryptionParam:boolean | undefined = props.enableEncryptionWithCustomerManagedKey;
+        let encryptionKeyParam:kms.Key | undefined = props.encryptionKey;
+
+        if (props.enableEncryptionWithCustomerManagedKey === undefined ||
+          props.enableEncryptionWithCustomerManagedKey === true) {
+            enableEncryptionParam = true;
+            // Create the encryptionKey if none was provided
+            if (!props.encryptionKey) {
+                encryptionKeyParam = buildEncryptionKey(scope, {
+                    encryptionKeyProps: props.encryptionKeyProps
+                });
+            }
+        }
+        // Setup the SNS topic
+        if (!props.existingTopicObj) {
+            // If an existingTopicObj was not specified create new topic
+            [this.snsTopic, this.encryptionKey] = defaults.buildTopic(this, {
+                topicProps: props.topicProps,
+                enableEncryption: enableEncryptionParam,
+                encryptionKey: encryptionKeyParam
+            });
+        } else {
+            // If an existingTopicObj was specified utilize the provided topic
+            this.snsTopic = props.existingTopicObj;
+        }
+
+        // Setup the queue
+        this.sqsQueue = defaults.buildQueue(this, 'queue', {
+            existingQueueObj: props.existingQueueObj,
+            queueProps: props.queueProps,
+            deadLetterQueue: this.deadLetterQueue,
+            enableEncryption: enableEncryptionParam,
+            encryptionKey: encryptionKeyParam
+        });
+
+        // Setup the SQS queue subscription to the SNS topic
+        this.snsTopic.addSubscription(new subscriptions.SqsSubscription(this.sqsQueue));
+
+        // Grant SNS service access to the SQS queue encryption key
+        if (this.sqsQueue.encryptionMasterKey) {
+            this.sqsQueue.encryptionMasterKey.grant(new iam.ServicePrincipal("sns.amazonaws.com"),
+              'kms:Decrypt',
+              'kms:GenerateDataKey*',
+            );
+        }
+    }
+}

source/patterns/@aws-solutions-constructs/aws-sns-sqs/package.json

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+{
+  "name": "@aws-solutions-constructs/aws-sns-sqs",
+  "version": "1.61.0",
+  "description": "CDK constructs for defining an interaction between an Amazon SNS topic and an Amazon SQS queue.",
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/awslabs/aws-solutions-constructs.git",
+    "directory": "source/patterns/@aws-solutions-constructs/aws-sns-sqs"
+  },
+  "author": {
+    "name": "Amazon Web Services",
+    "url": "https://aws.amazon.com",
+    "organization": true
+  },
+  "license": "Apache-2.0",
+  "scripts": {
+    "build": "tsc -b .",
+    "lint": "eslint -c ../eslintrc.yml --ext=.js,.ts . && tslint --project .",
+    "lint-fix": "eslint -c ../eslintrc.yml --ext=.js,.ts --fix .",
+    "test": "jest --coverage",
+    "clean": "tsc -b --clean",
+    "watch": "tsc -b -w",
+    "integ": "cdk-integ",
+    "integ-assert": "cdk-integ-assert",
+    "integ-no-clean": "cdk-integ --no-clean",
+    "jsii": "jsii",
+    "jsii-pacmak": "jsii-pacmak",
+    "build+lint+test": "npm run jsii && npm run lint && npm test && npm run integ-assert",
+    "snapshot-update": "npm run jsii && npm test -- -u && npm run integ-assert"
+  },
+  "jsii": {
+    "outdir": "dist",
+    "targets": {
+      "java": {
+        "package": "software.amazon.awsconstructs.services.snssqs",
+        "maven": {
+          "groupId": "software.amazon.awsconstructs",
+          "artifactId": "snssqs"
+        }
+      },
+      "dotnet": {
+        "namespace": "Amazon.Constructs.AWS.SnsSqs",
+        "packageId": "Amazon.Constructs.AWS.SnsSqs",
+        "signAssembly": true,
+        "iconUrl": "https://raw.githubusercontent.com/aws/aws-cdk/master/logo/default-256-dark.png"
+      },
+      "python": {
+        "distName": "aws-solutions-constructs.aws-sns-sqs",
+        "module": "aws_solutions_constructs.aws_sns_sqs"
+      }
+    }
+  },
+  "dependencies": {
+    "@aws-cdk/aws-iam": "~1.61.0",
+    "@aws-cdk/aws-sns": "~1.61.0",
+    "@aws-cdk/aws-sqs": "~1.61.0",
+    "@aws-cdk/aws-sns-subscriptions": "~1.61.0",
+    "@aws-cdk/aws-kms": "~1.61.0",
+    "@aws-cdk/core": "~1.61.0",
+    "@aws-solutions-constructs/core": "~1.61.0",
+    "constructs": "^3.0.4"
+  },
+  "devDependencies": {
+    "@aws-cdk/assert": "~1.61.0",
+    "@types/jest": "^24.0.23",
+    "@types/node": "^10.3.0"
+  },
+  "jest": {
+    "moduleFileExtensions": [
+      "js"
+    ]
+  },
+  "peerDependencies": {
+    "@aws-cdk/aws-iam": "~1.61.0",
+    "@aws-cdk/aws-sns": "~1.61.0",
+    "@aws-cdk/aws-sqs": "~1.61.0",
+    "@aws-cdk/aws-sns-subscriptions": "~1.61.0",
+    "@aws-cdk/aws-kms": "~1.61.0",
+    "@aws-cdk/core": "~1.61.0",
+    "@aws-solutions-constructs/core": "~1.61.0",
+    "constructs": "^3.0.4"
+  }
+}