(gen2-migration) `generate` command should handle project overrides

[iliapolo]

Is this feature request related to a new or existing Amplify category?

No response

Is this related to another service?

No response

Describe the feature you'd like to request

In Gen1, customers can override the built-in project resources by running amplify override project. This creates an overrides.ts file where customers can override resource properties using the CDK. For example

import { AmplifyProjectInfo, AmplifyRootStackTemplate } from '@aws-amplify/cli-extensibility-helper';

export function override(resources: AmplifyRootStackTemplate, amplifyProjectInfo: AmplifyProjectInfo) {
  resources.authRole.maxSessionDuration = 3600;
}

Our code-generation should take this override.ts file into account and produce the equivalent Gen2 code.

Describe the solution you'd like

Ideally, we would transform the override.ts to look like this:

export function override(backend: Backend<any>, amplifyProjectInfo: { envName: string, projectName: string }) {
  (backend.auth.resources.authenticatedUserIamRole.node.defaultChild as CfnRole).maxSessionDuration = 3600;
}

And then invoke this function from backend.ts:

import { override as overrideProject } from './override.ts`

const branchName = process.env.AWS_BRANCH ?? 'sandbox';
const backend = defineBackend({
  ...
});

overrideProject(backend, { envName: branchName, projectName: '<hard-code-project-name>' });

Describe alternatives you've considered

None

Additional context

amplify-cli/packages/amplify-cli-extensibility-helper/src/types/project/types.ts

Lines 7 to 16 in 664dabc

	export interface AmplifyRootStackTemplate {
	authRole?: iam.CfnRole;
	unauthRole?: iam.CfnRole;
	addCfnParameter: (props: cdk.CfnParameterProps, logicalId: string) => void;
	addCfnOutput: (props: cdk.CfnOutputProps, logicalId: string) => void;
	addCfnMapping: (props: cdk.CfnMappingProps, logicalId: string) => void;
	addCfnCondition: (props: cdk.CfnConditionProps, logicalId: string) => void;
	addCfnResource: (props: cdk.CfnResourceProps, logicalId: string) => void;
	}

Note that the auth and unauth role used to be part of the root stack in Gen1; In Gen2, they are part of the auth stack.

Is this something that you'd be interested in working on?

• 👋 I may be able to implement this feature request

Would this feature include a breaking change?

• ⚠️ This feature might incur a breaking change