feat(aws-events-rule-sqs & aws-events-rule-sns): New aws-events-rule-…

…sqs and aws-events-rule-sns pattern implementation (#55)

* Initial commit for the pattern aws-events-rule-sns

* changes to the implementation of the constructs and tests

* Changing iam policies for the event rule to sns

* Committing integration tests

* Adding README.md

* Adding README.md

* Adding README.md

* Adding new construct aws-events-rule-sqs

* modifying event rule target for sns

* Removing references to lambda in the stack references

* Adding unit tests

* Adding the integration tests

* Fixing integration testing issues

* Removing unnecessary snapshot files

* Adding architecture diagrams

* Removing redundant configurations in .gitignore and .eslintignore

* Code Review

* Code review comments

source/patterns/@aws-solutions-constructs/aws-events-rule-sns/.eslintignore

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

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

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+# aws-events-rule-sns 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 This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.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_events_rule_sns`|
+|![Typescript Logo](https://docs.aws.amazon.com/cdk/api/latest/img/typescript32.png) Typescript|`@aws-solutions-constructs/aws-events-rule-sns`|
+|![Java Logo](https://docs.aws.amazon.com/cdk/api/latest/img/java32.png) Java|`software.amazon.awsconstructs.services.eventsrulesns`|
+
+This AWS Solutions Construct implements an AWS Events rule and an AWS SNS Topic.
+
+Here is a minimal deployable pattern definition:
+
+``` typescript
+import { EventsRuleToSNSTopicProps, EventsRuleToSNSTopic } from "@aws-solutions-constructs/aws-events-rule-sns";
+
+const props: EventsRuleToSNSTopicProps = {
+    eventRuleProps: {
+      schedule: events.Schedule.rate(Duration.minutes(5)),
+    },
+    topicsProps: {
+      displayName: 'event-rule-sns'
+    }
+};
+
+new EventsRuleToSNSTopic(this, 'test-events-rule-sns', props);
+```
+
+## Initializer
+
+``` text
+new EventsRuleToSNSTopic(scope: Construct, id: string, props: EventsRuleToSNSTopicProps);
+```
+
+_Parameters_
+
+* scope [`Construct`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_core.Construct.html)
+* id `string`
+* props [`EventsRuleToSNSTopicProps`](#pattern-construct-props)
+
+## Pattern Construct Props
+
+| **Name**     | **Type**        | **Description** |
+|:-------------|:----------------|-----------------|
+|eventRuleProps|[`events.RuleProps`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-events.RuleProps.html)|User provided eventRuleProps to override the defaults. |
+|existingTopicObj?|[`sns.Topic`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-lambda.Function.html)|Existing instance of SNS Topic object, if this is set then the topicProps is ignored.|
+|topicProps?|[`sns.TopicProps`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-sns.TopicProps.html)|User provided props to override the default props for the SNS Topic. |
+
+
+## Pattern Properties
+
+| **Name**     | **Type**        | **Description** |
+|:-------------|:----------------|-----------------|
+|eventsRule|[`events.Rule`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-events.Rule.html)|Returns an instance of events.Rule created by the construct|
+|snsTopic|[`sns.Topic`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-sns.Topic.html)|Returns an instance of sns.Topic created by the construct|
+
+## Default settings
+
+Out of the box implementation of the Construct without any override will set the following defaults:
+
+### Amazon CloudWatch Events Rule
+* Grant least privilege permissions to CloudWatch Events to publish to the SNS Topic
+
+### Amazon SNS Topic
+* Configure least privilege access permissions for SNS Topic
+* Enable server-side encryption forSNS Topic using AWS 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-events-rule-sns/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.
+ */
+
+import * as sns from '@aws-cdk/aws-sns';
+import * as events from '@aws-cdk/aws-events';
+import * as defaults from '@aws-solutions-constructs/core';
+import { Construct } from '@aws-cdk/core';
+import { overrideProps } from '@aws-solutions-constructs/core';
+import { ArnPrincipal } from '@aws-cdk/aws-iam';
+
+export interface EventsRuleToSNSTopicProps {
+    /**
+     * User provided props to override the default props for the SNS Topic.
+     *
+     * @default - Default props are used
+     */
+    readonly topicsProps?: sns.TopicProps
+    /**
+     * User provided eventRuleProps to override the defaults
+     *
+     * @default - None
+     */
+    readonly eventRuleProps: events.RuleProps
+    /**
+     * Existing instance of SNS Topic object, if this is set then topicProps is ignored.
+     *
+     * @default - Default props are used
+     */
+    readonly existingTopicObj?: sns.Topic,
+}
+
+export class EventsRuleToSNSTopic extends Construct {
+    public readonly snsTopic: sns.Topic;
+    public readonly eventsRule: events.Rule;
+
+
+    /**
+     * @summary Constructs a new instance of the EventRuleToSns class.
+     * @param {cdk.App} scope - represents the scope for all the resources.
+     * @param {string} id - this is a a scope-unique id.
+     * @param {EventsRuleToSNSTopicProps} props - user provided props for the construct.
+     * @since 1.61.1
+     * @access public
+     */
+    constructor(scope: Construct, id: string, props: EventsRuleToSNSTopicProps) {
+        super(scope, id);
+
+        //Setup the sns topic.
+        [this.snsTopic] = defaults.buildTopic(this, {
+            existingTopicObj: props.existingTopicObj,
+            topicProps: props.topicsProps
+        });
+
+        //Setup the event rule target as sns topic.
+        const topicEventTarget: events.IRuleTarget = {
+            bind: () => ({
+                id: this.snsTopic.topicName,
+                arn: this.snsTopic.topicArn
+            })
+        }
+
+        //Setup up the event rule property.
+        const defaultEventsRuleProps = defaults.DefaultEventsRuleProps([topicEventTarget]); 
+        const eventsRuleProps = overrideProps(defaultEventsRuleProps, props.eventRuleProps, true);
+
+        //Setup up the event rule.
+        this.eventsRule = new events.Rule(this, 'EventsRule', eventsRuleProps);
+
+        //Setup up the grant policy for event to be able to publish to the sns topic.
+        this.snsTopic.grantPublish(new ArnPrincipal(this.eventsRule.ruleArn))
+    }
+
+}

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

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+{
+  "name": "@aws-solutions-constructs/aws-events-rule-sns",
+  "version": "1.61.1",
+  "description": "CDK Constructs for deploying AWS Events Rule that invokes AWS SNS",
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
+  "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-no-clean": "cdk-integ --no-clean",
+    "integ-assert": "cdk-integ-assert",
+    "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"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/awslabs/aws-solutions-constructs.git",
+    "directory": "source/patterns/@aws-solutions-constructs/aws-events-rule-sns"
+  },
+  "author": {
+    "name": "Amazon Web Services",
+    "url": "https://aws.amazon.com",
+    "organization": true
+  },
+  "license": "Apache-2.0",
+  "jsii": {
+    "outdir": "dist",
+    "targets": {
+      "java": {
+        "package": "software.amazon.awsconstructs.services.eventsrulesns",
+        "maven": {
+          "groupId": "software.amazon.awsconstructs",
+          "artifactId": "eventsrulesns"
+        }
+      },
+      "dotnet": {
+        "namespace": "Amazon.Constructs.AWS.EventsRuleSns",
+        "packageId": "Amazon.Constructs.AWS.EventsRuleSns",
+        "signAssembly": true,
+        "iconUrl": "https://raw.githubusercontent.com/aws/aws-cdk/master/logo/default-256-dark.png"
+      },
+      "python": {
+        "distName": "aws-solutions-constructs.aws-events-rule-sns",
+        "module": "aws_solutions_constructs.aws_events_rule_sns"
+      }
+    }
+  },
+  "dependencies": {
+    "@aws-cdk/aws-events": "~1.61.1",
+    "@aws-cdk/aws-iam": "~1.61.1",
+    "@aws-cdk/aws-sns": "~1.61.1",
+    "@aws-cdk/core": "~1.61.1",
+    "@aws-solutions-constructs/core": "~1.61.1",
+    "constructs": "^3.0.4"
+  },
+  "devDependencies": {
+    "@aws-cdk/assert": "~1.61.1",
+    "@types/jest": "^24.0.23",
+    "@types/node": "^10.3.0"
+  },
+  "jest": {
+    "moduleFileExtensions": [
+      "js"
+    ]
+  },
+  "peerDependencies": {
+    "@aws-cdk/aws-sns": "~1.61.1",
+    "@aws-cdk/core": "~1.61.1",
+    "@aws-cdk/aws-events": "~1.61.1",
+    "@aws-cdk/aws-iam": "~1.61.1",
+    "@aws-cdk/aws-kms": "~1.61.1",
+    "@aws-solutions-constructs/core": "~1.61.1",
+    "constructs": "^3.0.4"
+  }
+}