fix: auth dependency with cdkv2 (#11587)

* fix: add a dependsOn to custom resource for auth trigger (#11504)

* fix: add a dependsOn to custom resource for auth trigger

* test: add snapshot tests to show cfn changes for dependencies

* fix: mock uuid lib in test

* fix: auth trigger template rendering

Co-authored-by: Danielle Adams <[email protected]>

packages/amplify-category-auth/src/__tests__/provider-utils/awscloudformation/utils/__snapshots__/generate-auth-trigger-template.test.ts.snap

@@ -195,7 +195,7 @@ exports.handler = async function (event, context) {
             "Arn",
           ],
         },
-        "Runtime": "nodejs14.x",
+        "Runtime": "nodejs16.x",
       },
       "Type": "AWS::Lambda::Function",
     },

packages/amplify-category-auth/src/provider-utils/awscloudformation/utils/generate-auth-trigger-template.ts

@@ -28,7 +28,7 @@ const CFN_TEMPLATE_FORMAT_VERSION = '2010-09-09';
  */
 export class CustomResourceAuthStack extends cdk.Stack {
   constructor(scope: Construct, id: string, props: CustomResourceAuthStackProps) {
-    super(scope, id, props);
+    super(scope, id, { ...props, synthesizer: new cdk.LegacyStackSynthesizer() });
     this.templateOptions.templateFormatVersion = CFN_TEMPLATE_FORMAT_VERSION;
 
     const env = new cdk.CfnParameter(this, 'env', {
@@ -74,10 +74,20 @@ export class CustomResourceAuthStack extends cdk.Stack {
   }
 
   /**
-   * Generates a CFN template from the CDK stack
+   * This function renderers a full CFN template for this stack.
+   * It is inspired by
+   * https://github.com/aws/aws-cdk/blob/bd056d1d38a2d3f43efe4f857c4d38b30fb9b681/packages/%40aws-cdk/assertions/lib/template.ts#L298-L310.
+   * This replaces private prepareApp (from CDK v1) and this._toCloudFormation() (the latter does not function properly without the former).
    */
-  toCloudFormation(): Record<string, unknown> {
-    return this._toCloudFormation();
+  toCloudFormation = (): $TSAny => {
+    const root = this.node.root as cdk.Stage;
+    const assembly = root.synth();
+    if (!this.nestedStackParent) {
+      return assembly.getStackArtifact(this.artifactId).template;
+    }
+    // if this is a nested stack ( i.e. it has a parent), then just read the template as a string
+    const template = fs.readFileSync(path.join(assembly.directory, this.templateFile));
+    return JSON.parse(template.toString('utf-8'));
   }
 }