Typescript example for creating aws cdk resources using a swaggerfile

app.ts

import * as cdk from '@aws-cdk/cdk';
import * as SwaggerParser from "swagger-parser";
import convertSwaggerToCdkRestApi from "./swaggerHelper";

SwaggerParser
  .parse("./swagger.yaml")
  .then(swagger => {
    const app = new cdk.App();

    let apiGateway = new apigateway.RestApi(this, "My Rest API", {
      restApiName: "My Rest API",
    });

    convertSwaggerToCdkRestApi(this, apiGateway, swagger);

    app.synth();
  });

swagger.yaml

swagger: "2.0"

info:
  version: "1.0"
  title: "Hello World API"
paths:
  /hello/{userName}:
    get:
      x-cdk-lambda-code: ./functions/helloWorldLambda/
      x-cdk-lambda-handler: helloWorldLambda
      x-cdk-lambda-name: helloWorldGetLambda
      description: Returns a greeting to the user!
      parameters:
      - name: userName
        in: path
        required: true
        type: string
      responses:
        200:
          description: Returns the greeting.
          schema:
            type: string
        400:
          description: Bad Request

swaggerHelper.ts

import * as cdk from "@aws-cdk/cdk";
import * as apigateway from '@aws-cdk/aws-apigateway';
import * as lambda from '@aws-cdk/aws-lambda';
import { LambdaIntegration } from "@aws-cdk/aws-apigateway";

export default function convertSwaggerToCdkRestApi(scope:cdk.Construct, apiGateway:apigateway.RestApi, swaggerApi: any) {

  let createdLambdas:Map<string, lambda.Function> = new Map<string, lambda.Function>();
  let paths = Object.keys(swaggerApi.paths);
  
  paths.forEach(pathName => {
    const resource = apiGateway.root.resourceForPath(pathName);
    const methods = Object.keys(swaggerApi.paths[pathName]);

    methods.forEach(methodName => {
      let endpoint = swaggerApi.paths[pathName][methodName];
      let backingLambda: lambda.Function;

      if (createdLambdas.has(endpoint["x-cdk-lambda-name"]) === false) {
        createdLambdas.set(endpoint["x-cdk-lambda-name"], 
          new lambda.Function(scope, endpoint["x-cdk-lambda-name"], {
            code: lambda.Code.asset(endpoint["x-cdk-lambda-code"]),
            handler: endpoint["x-cdk-lambda-handler"],
            runtime: lambda.Runtime.Go1x
          })
        );
      }

      backingLambda = createdLambdas.get(endpoint["x-cdk-lambda-name"])!;

      let integrationParameters:any = undefined; 
      let methodParameters:any = undefined; 

      if (endpoint.parameters && endpoint.parameters.length) {
        let parameters:any[] = endpoint.parameters;
        integrationParameters = {}; 
        methodParameters = {};

        parameters.forEach(swaggerParameter => {
          integrationParameters[`integration.request.${swaggerParameter.in}.${swaggerParameter.name}`] = `method.request.${swaggerParameter.in}.${swaggerParameter.name}`;
          methodParameters[`method.request.${swaggerParameter.in}.${swaggerParameter.name}`] = true;
        });
      }

      resource.addMethod(methodName, 
        new LambdaIntegration(backingLambda, {
          requestParameters: integrationParameters
        }),
        {
          requestParameters: methodParameters
        });
    });

  });
} 

Thanks for putting it together. Will this utility be able to also import an open API 3.0 file as an aws-cdk construct ?