feat(core): allow setting termination protection on stacks

This commit adds a getter and setter for Stack termination
protection. This allows termination protection to be configured
after the Stack has been constructed.

fixes aws#14463

packages/@aws-cdk/core/README.md

@@ -864,6 +864,9 @@ on a stack by setting the `terminationProtection` prop to `true`.
 const stack = new Stack(app, 'StackName', {
   terminationProtection: true,
 });
+
+// or
+stack.terminationProtection = true;
 ```
 
 By default, termination protection is disabled.

packages/@aws-cdk/core/lib/stack.ts

@@ -267,7 +267,7 @@ export class Stack extends CoreConstruct implements ITaggable {
   /**
    * Whether termination protection is enabled for this stack.
    */
-  public readonly terminationProtection?: boolean;
+  private _terminationProtection: boolean;
 
   /**
    * If this is a nested stack, this represents its `AWS::CloudFormation::Stack`
@@ -358,7 +358,7 @@ export class Stack extends CoreConstruct implements ITaggable {
     this.account = account;
     this.region = region;
     this.environment = environment;
-    this.terminationProtection = props.terminationProtection;
+    this._terminationProtection = !!props.terminationProtection;
 
     if (props.description !== undefined) {
       // Max length 1024 bytes
@@ -689,6 +689,25 @@ export class Stack extends CoreConstruct implements ITaggable {
     return this.nestedStackParent;
   }
 
+  /**
+   * Whether termination protection is enabled for this stack.
+   *
+   * @returns The current termination protection value for this stack.
+   */
+  public get terminationProtection(): boolean {
+    return this._terminationProtection;
+  }
+
+  /**
+   * Enables or disables termination protection for this stack.
+   *
+   * @param enableTerminationProtection The new termination protection value
+   * for this stack.
+   */
+  public set terminationProtection(enableTerminationProtection: boolean) {
+    this._terminationProtection = enableTerminationProtection;
+  }
+
   /**
    * Add a Transform to this stack. A Transform is a macro that AWS
    * CloudFormation uses to process your template.

packages/@aws-cdk/core/test/stack.test.ts

@@ -1095,12 +1095,29 @@ describe('stack', () => {
   test('Termination Protection is reflected in Cloud Assembly artifact', () => {
     // if the root is an app, invoke "synth" to avoid double synthesis
     const app = new App();
-    const stack = new Stack(app, 'Stack', { terminationProtection: true });
+    const stack1 = new Stack(app, 'Stack1');
+    const stack2 = new Stack(app, 'Stack2', { terminationProtection: false });
+    const stack3 = new Stack(app, 'Stack3', { terminationProtection: true });
+    const stack4 = new Stack(app, 'Stack4');
 
-    const assembly = app.synth();
-    const artifact = assembly.getStackArtifact(stack.artifactId);
+    expect(stack1.terminationProtection).toEqual(false);
+    expect(stack2.terminationProtection).toEqual(false);
+    expect(stack3.terminationProtection).toEqual(true);
+    expect(stack4.terminationProtection).toEqual(false);
 
-    expect(artifact.terminationProtection).toEqual(true);
+    stack4.terminationProtection = true;
+    expect(stack4.terminationProtection).toEqual(true);
+
+    const assembly = app.synth();
+    const artifact1 = assembly.getStackArtifact(stack1.artifactId);
+    const artifact2 = assembly.getStackArtifact(stack2.artifactId);
+    const artifact3 = assembly.getStackArtifact(stack3.artifactId);
+    const artifact4 = assembly.getStackArtifact(stack4.artifactId);
+
+    expect(artifact1.terminationProtection).toEqual(false);
+    expect(artifact2.terminationProtection).toEqual(false);
+    expect(artifact3.terminationProtection).toEqual(true);
+    expect(artifact4.terminationProtection).toEqual(true);
 
 
   });

packages/@aws-cdk/core/test/synthesis.test.ts

@@ -106,6 +106,7 @@ nodeunitShim({
           environment: 'aws://unknown-account/unknown-region',
           properties: {
             templateFile: 'one-stack.template.json',
+            terminationProtection: false,
             validateOnSynth: false,
           },
           displayName: 'one-stack',