aws-stepfunctions-tasks.apigateway: cross-region RestAPI not supported

[kiwi-33]

Describe the bug

CDK builds an endpoint URL using the region of the Stack. This is a problem when I want to call a Rest API that is in a different region from the StepFunction.

Expected Behavior

From a StepFunction in region-A, I can invoke a RestAPI in region-B.

Current Behavior

API Endpoint is always the same region as the stack

https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-stepfunctions-tasks/lib/apigateway/call-rest-api.ts#L68 (it is built without consideration for the region.)

Reproduction Steps

this is the default behavior of the CallApiGatewayRestApiEndpoint class.

Possible Solution

restApiRegion can be passed as an optional parameter and is used when building the URL in the getApiEndpoint() method.

Additional Information/Context

No response

CDK CLI Version

2.88.0

Framework Version

No response

Node.js Version

v16.20.0

OS

MacOS Darwin

Language

Typescript

Language Version

4.9.5

Other information

No response

[pahud]

Yes you are right.

But looks like there's no region info in IRestApi.

aws-cdk/packages/aws-cdk-lib/aws-apigateway/lib/restapi.ts

Lines 25 to 75 in 4103e79

	export interface IRestApi extends IResourceBase {
	/**
	* The ID of this API Gateway RestApi.
	* @attribute
	*/
	readonly restApiId: string;
	/**
	* The name of this API Gateway RestApi.
	* @attribute
	*/
	readonly restApiName: string;
	/**
	* The resource ID of the root resource.
	* @attribute
	*/
	readonly restApiRootResourceId: string;
	/**
	* API Gateway deployment that represents the latest changes of the API.
	* This resource will be automatically updated every time the REST API model changes.
	* `undefined` when no deployment is configured.
	*/
	readonly latestDeployment?: Deployment;
	/**
	* API Gateway stage that points to the latest deployment (if defined).
	*/
	deploymentStage: Stage;
	/**
	* Represents the root resource ("/") of this API. Use it to define the API model:
	*
	* api.root.addMethod('ANY', redirectToHomePage); // "ANY /"
	* api.root.addResource('friends').addMethod('GET', getFriendsHandler); // "GET /friends"
	*
	*/
	readonly root: IResource;
	/**
	* Gets the "execute-api" ARN
	* @returns The "execute-api" ARN.
	* @default "*" returns the execute API ARN for all methods/resources in
	* this API.
	* @param method The method (default `*`)
	* @param path The resource path. Must start with '/' (default `*`)
	* @param stage The stage (default `*`)
	*/
	arnForExecuteApi(method?: string, path?: string, stage?: string): string;
	}

Maybe we should provide a region optional parameter for getApiEndpoint():

aws-cdk/packages/aws-cdk-lib/aws-stepfunctions-tasks/lib/apigateway/call-rest-api.ts

Line 66 in 4103e79

private getApiEndpoint(): string {