(stepfunctions): invoke rest api with path from input

[florianbepunkt]

Describe the bug

const callGetChannelApi = new sfnt.CallApiGatewayRestApiEndpoint(this, "Get channel", {
      api: adminApi,
      method: sfnt.HttpMethod.GET,
      stageName: "production",
      apiPath: sfn.JsonPath.format("/channels/{}", sfn.JsonPath.stringAt("$.channelId")), // << using a static string path works, this doesn't
      authType: sfnt.AuthType.IAM_ROLE,
      resultPath: "$.channel",
});

Expected Behavior

Input path should be resolved.

Current Behavior

CDK throws an error during deployment.

      throw new Error(`"path" must begin with a "/": '${path}'`);

Reproduction Steps

import * as sfn from "aws-cdk-lib/aws-stepfunctions";
import * as sfnt from "aws-cdk-lib/aws-stepfunctions-tasks";

const callGetChannelApi = new sfnt.CallApiGatewayRestApiEndpoint(this, "Get channel", {
      api: adminApi,
      method: sfnt.HttpMethod.GET,
      stageName: "production",
      apiPath: sfn.JsonPath.format("/channels/{}", sfn.JsonPath.stringAt("$.channelId")),
      authType: sfnt.AuthType.IAM_ROLE,
      resultPath: "$.channel",
});

const processExportSm = new sfn.StateMachine(this, "Process exports SM", {
      definition: callGetChannelApi,
    });

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.23.0 (build 50444aa)

Framework Version

No response

Node.js Version

v16.10.0

OS

MacOS X

Language

Typescript

Language Version

No response

Other information

No response

[kaizencc]

Thanks for opening the issue @florianbepunkt! Looks like the offending line is here:

https://github.com/aws/aws-cdk/blob/master/packages/@aws-cdk/aws-stepfunctions-tasks/lib/apigateway/call-rest-api.ts#L60

We're calling arnForExecuteApi on the apigateway.IRestApi which is not equipped to handle jsonPath. Since apigateway should not need to know about jsonPaths, maybe the best way to fix this would be to recreate the arnForExecuteApi inside of CallApiGatewayRestApiEndpoint without the synth time checks.

[tejasmr]

@kaizencc can you review my PR #20294

[github-actions]

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