Setting path parameters in AWS API Gateway JavaScript SDK

Question

I'm trying to set path parameters when making calls to API Gateway endpoints via the JavaScript SDK and not having any luck. It looks like I either have something misconfigured or there is a bug in the SDK generation.

I am able to successfully call endpoints that do not take path parameters but when I try to pass in a parameter to be used as a path parameter the SDK just replaces the path parameter with a blank and my call fails.

Example, assume client is a properly initialized API Gateway client. I have an endpoint called /measurement with a child of /measurement/{id}. I am able to call both directly.

client.measurementGet({},{}); - successfully calls my /measurement endpoint client.measurementIdGet({"id": "1234"}, {}); - Browser makes a call to /measurement/ instead of /measurement/1234

Looking at the source of my apigClient.js, it appears that the SDK generator is not putting path parameters into the list of parameters that it's looking for. For example, the code of my generated measurementIdGet method looks like this:

    apigClient.measurementIdGet = function (params, body, additionalParams) {
        if(additionalParams === undefined) { additionalParams = {}; }

        apiGateway.core.utils.assertParametersDefined(params, [], ['body']);

        var measurementIdGetRequest = {
            verb: 'get'.toUpperCase(),
            path: pathComponent + uritemplate('/measurement/{id}').expand(apiGateway.core.utils.parseParametersToObject(params, [])),
            headers: apiGateway.core.utils.parseParametersToObject(params, []),
            queryParams: apiGateway.core.utils.parseParametersToObject(params, []),
            body: body
        };

        return apiGatewayClient.makeRequest(measurementIdGetRequest, authType, additionalParams, config.apiKey);
    };

I dug into the assertParametersDefined and parseParametersToObject and it looks like those methods are expecting a list of parameters to look for. In both cases the SDK has generated empty lists instead of putting my path parameter in there.

If I manually update the generated file to change the two lines to

apiGateway.core.utils.assertParametersDefined(params, ['id'], ['body']);

and

apiGateway.core.utils.parseParametersToObject(params, ['id'])

The SDK makes the proper call.

Am I missing something in my configuration or is there a bug in the code generator?

Answer 1

If you are using cloud formation like me. You will need to add it in the RequestParameters.

for a resource like this /api/pets/{id}/attributes/{attrid} following code works

  PetsByIdAttributesByAttridGetMethod:
    Type: 'AWS::ApiGateway::Method'
    Properties:
      RestApiId: !Ref MyApi
      ResourceId: !Ref PetsByIdAttributesByAttridResource
      HttpMethod: GET
      AuthorizationType: AWS_IAM
      RequestParameters:
        method.request.path.id : true
        method.request.path.attrid : true
      Integration:
        Type: AWS_PROXY
        IntegrationHttpMethod: POST
        Uri: !Sub arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${MyLambda.Arn}/invocations