feat(cdk-pipeline): add url and sns topic for manual approval in cdk pipeline (re-create PR since original is auto-closed) (#34654)

### Issue #32809

Closes #12273

Original PR with approved changes: #34227 

### Reason for this change

No concrete solution to output cdk diff in pipeline yet.
Include ExternalEntityLink and SNS Topic to manual approval step for custom diff check solution.

### Description of changes

Add url for review and SNS topic in ManualApprovalStepProps

### Description of how you validated changes

Unit tested

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: pitayapj

packages/aws-cdk-lib/pipelines/README.md

@@ -565,6 +565,7 @@ pass in order to promote from the `PreProd` to the `Prod` environment:
 declare const pipeline: pipelines.CodePipeline;
 const preprod = new MyApplicationStage(this, 'PreProd');
 const prod = new MyApplicationStage(this, 'Prod');
+const topic = new sns.Topic(this, 'ChangeApprovalTopic');
 
 pipeline.addStage(preprod, {
   post: [
@@ -574,7 +575,12 @@ pipeline.addStage(preprod, {
   ],
 });
 pipeline.addStage(prod, {
-  pre: [new pipelines.ManualApprovalStep('PromoteToProd')],
+  pre: [new pipelines.ManualApprovalStep('PromoteToProd', {
+    //All options below are optional
+    comment: 'Please validate changes',
+    reviewUrl: 'https://my.webservice.com/',
+    notificationTopic: topic,
+  })],
 });
 ```
 

packages/aws-cdk-lib/pipelines/lib/blueprint/manual-approval.ts

@@ -1,5 +1,5 @@
 import { Step } from './step';
-
+import { ITopic } from '../../../aws-sns';
 /**
  * Construction properties for a `ManualApprovalStep`
  */
@@ -10,6 +10,20 @@ export interface ManualApprovalStepProps {
    * @default - No comment
    */
   readonly comment?: string;
+
+  /**
+   * The URL for review associated with this manual approval
+   *
+   * @default - No URL
+   */
+  readonly reviewUrl?: string;
+
+  /**
+   * Optional SNS topic to send notifications to when an approval is pending
+   *
+   * @default - No notifications
+   */
+  readonly notificationTopic?: ITopic;
 }
 
 /**
@@ -29,10 +43,26 @@ export class ManualApprovalStep extends Step {
    */
   public readonly comment?: string;
 
+  /**
+   * The URL for review associated with this manual approval
+   *
+   * @default - No URL
+   */
+  public readonly reviewUrl?: string;
+
+  /**
+   * Optional SNS topic to send notifications
+   *
+   * @default - No notifications
+   */
+  public readonly notificationTopic?: ITopic;
+
   constructor(id: string, props: ManualApprovalStepProps = {}) {
     super(id);
 
     this.comment = props.comment;
+    this.reviewUrl = props.reviewUrl;
+    this.notificationTopic = props.notificationTopic;
 
     this.discoverReferencedOutputs(props.comment);
   }

packages/aws-cdk-lib/pipelines/lib/codepipeline/codepipeline.ts

@@ -714,6 +714,8 @@ export class CodePipeline extends PipelineBase {
             actionName: options.actionName,
             runOrder: options.runOrder,
             additionalInformation: step.comment,
+            externalEntityLink: step.reviewUrl,
+            notificationTopic: step.notificationTopic,
           }));
           return { runOrdersConsumed: 1 };
         },

packages/aws-cdk-lib/pipelines/test/codepipeline/codepipeline.test.ts

@@ -4,6 +4,7 @@ import * as ccommit from '../../../aws-codecommit';
 import { Pipeline, PipelineType } from '../../../aws-codepipeline';
 import * as iam from '../../../aws-iam';
 import * as s3 from '../../../aws-s3';
+import * as sns from '../../../aws-sns';
 import * as sqs from '../../../aws-sqs';
 import * as cdk from '../../../core';
 import { Stack } from '../../../core';
@@ -731,6 +732,77 @@ test('throws when deploy role session tags are used', () => {
   }).toThrow('Deployment of stack SampleStage-123456789012-us-east-1-SampleStack requires assuming the role arn:${AWS::Partition}:iam::123456789012:role/cdk-hnb659fds-deploy-role-123456789012-us-east-1 with session tags, but assuming roles with session tags is not supported by CodePipeline.');
 });
 
+test('test add external link for manual approval', () => {
+  const pipelineStack = new cdk.Stack(app, 'PipelineStack', { env: PIPELINE_ENV });
+
+  const pipeline = new ModernTestGitHubNpmPipeline(pipelineStack, 'Cdk', {
+    crossAccountKeys: true,
+  });
+
+  const stage = new TwoStackApp(app, 'TheApp', { withDependency: false });
+
+  const approval = new cdkp.ManualApprovalStep('Approval', {
+    comment: 'Please approve',
+    reviewUrl: 'https://approve-confirm.com',
+  });
+
+  pipeline.addStage(stage, {
+    pre: [approval],
+  });
+
+  const template = Template.fromStack(pipelineStack);
+  template.hasResourceProperties('AWS::CodePipeline::Pipeline', {
+    Stages: Match.arrayWith([{
+      Name: 'TheApp',
+      Actions: Match.arrayWith([
+        Match.objectLike({
+          Name: 'Approval',
+          RunOrder: 1,
+          Configuration: Match.objectLike({
+            ExternalEntityLink: 'https://approve-confirm.com',
+          }),
+        }),
+      ]),
+    }]),
+  });
+});
+
+test('sns topic for manual approval', () => {
+  const pipelineStack = new cdk.Stack(app, 'PipelineStack', { env: PIPELINE_ENV });
+  const pipeline = new ModernTestGitHubNpmPipeline(pipelineStack, 'Cdk', {
+    crossAccountKeys: true,
+  });
+  const topic = new sns.Topic(pipelineStack, 'Topic', {
+    topicName: 'MyTopic',
+  });
+  const approval = new cdkp.ManualApprovalStep('Approval', {
+    comment: 'Please approve',
+    notificationTopic: topic,
+  });
+  const stage = new TwoStackApp(app, 'TheApp', { withDependency: false });
+  pipeline.addStage(stage, {
+    pre: [approval],
+  });
+  const template = Template.fromStack(pipelineStack);
+  template.hasResourceProperties('AWS::CodePipeline::Pipeline', {
+    Stages: Match.arrayWith([{
+      Name: 'TheApp',
+      Actions: Match.arrayWith([
+        Match.objectLike({
+          Name: 'Approval',
+          RunOrder: 1,
+          Configuration: Match.objectLike({
+            NotificationArn: { Ref: 'TopicBFC7AF6E' },
+          }),
+        }),
+      ]),
+    }]),
+  });
+  template.hasResourceProperties('AWS::SNS::Topic', {
+    TopicName: 'MyTopic',
+  });
+});
+
 interface ReuseCodePipelineStackProps extends cdk.StackProps {
   reuseCrossRegionSupportStacks?: boolean;
   reuseStageProps?: ReuseStageProps;