how to pass path parameter to AWS api gateway using AWS Step function?

Question

In aws step function i need to call api gateway endpoint with path parameters from previous state values.

Step Function Code (Api Gateway Call)

"API Gateway Request": {
  "Type": "Task",
  "Resource": "arn:aws:states:::apigateway:invoke",
  "Parameters": {
    "ApiEndpoint": "****.amazonaws.com",
    "Method": "GET",
    "Headers": {
      "Accept": [
        "application/json"
      ]
    },
    "Stage": "dev",
    "Path": "/sample/$.id",
    "AuthType": "IAM_ROLE"
  },
  "InputPath": "$.id",
  "Next": "Lambda Invoke",
  "ResultPath": "$.myStateInput"
}

Input to this state:

{ "id": "1231" }

Instead of replacing "$.id" as "1231", it just calling url like below Api Gateway:

Please tell what i'm doing wrong ?

@Marcin please accept my edit to your answer "Path.$": States.Format('/sample/{}', $.id) — born to code
– born to code, Commented Sep 8, 2021 at 10:21

born to code · Accepted Answer · 2021-09-08 10:26:47Z

5

Based on the comments, the solution was to use intrinsic function:

"Path.$": States.Format('/sample/{}', $.id)

State Code

"API Gateway Request": {
  "Type": "Task",
  "Resource": "arn:aws:states:::apigateway:invoke",
  "Parameters": {
    "ApiEndpoint": "**.amazonaws.com",
    "Method": "GET",
    "Headers": {
      "Accept": [
        "application/json"
      ]
    },
    "Stage": "dev",
    "Path.$": "States.Format('/sample/{}', $.id)",
    "AuthType": "IAM_ROLE"
  },
  "Next": "Lambda Invoke",
  "ResultPath": "$.myStateInput"
}

edited Sep 8, 2021 at 10:26

born to code

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answered Sep 6, 2021 at 10:02

Marcin

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