Setup APIgateway from Swagger | programmatically - node.js

Question

I am trying to create multiple APIs in APIGateway using a Swagger file.
Right now, when I use the AWS console, I manually import the swagger file and then add the endpoints/authentication in every API created.
I want to complete the same task using AWS Lambda (Node JS), so that i may:
Create APIs using Swagger
Add endpoints (custom server)
Add authorizer (cognito)
I looked into AWS documentation but was not able to understand it in a proper way.
How to complete this task?

Answer 1

If you really have to use swagger, I would say
Write your APIs in swagger json format
Parse it to add your API gateway extensions (endpoints/authorizer/role)
Publish it
Or
Create your API with the given swagger document
Pass the restapi id to a lambda function
Use apigateway SDK (e.g. NodeJS SDK for APIGateway) to get resources and methods for the restapi and add integrations to it.
But have you considered AWS Cloudformation scripts? In my current project, I have considered what you want to do but being no expert in swagger I chose Cloudformation over it. (also considered AWS SAM and serverless). It is a little repetitive but found much easier to write and understand. Here's an example of an endpoint in CFN yaml format -
ResourceUserActions:
Type: AWS::ApiGateway::Resource
DeletionPolicy: Delete
Properties:
RestApiId: !Ref RestAPI
ParentId: !Ref ResourceUser
PathPart: "{action+}"
UserActionsMethod:
Type: AWS::ApiGateway::Method
Properties:
RestApiId: !Ref RestAPI
ResourceId: !Ref ResourceUserActions
HttpMethod: ANY
AuthorizationType: COGNITO_USER_POOLS
AuthorizerId: !Ref ApiAuthorizer
Integration:
Type: AWS_PROXY
IntegrationHttpMethod: POST
Uri: !Sub arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${HandlerFunction.Arn}/invocations
Credentials: !GetAtt ApiGatewayRole.Arn
Type AWS::ApiGateway::Resource defines a resource, and AWS::ApiGateway::Method adds method, authorizer, integration type details to the resource. For more details, see AWS CFN for APIGateway