AWS Demo

This project show how I use AWS services.

Building an authentication app

Stack

• Cognito (User Pool)
• DynamoDB (DataBase)
• Lambda (Serverless)
• AWS SAM (IaC)
• NodeJS (Runtime)

How to run

Prerequisites

• AWS SAM CLI

Redeploy

No need to redeploy the stack.
But if you do, you can use the following commands:

sam build
sam deploy

And replace the tests with the new API Gateway URLs.

There are two gateways:

1. Unauthenticated requests
   • output key: WebEndpoint
   • functions: Create user, Login user
2. Authenticated requests
   • output key: WebAuthEndpoint
   • functions: Get user, Update user

Test results

1. Create user

POST https://mc1qjoxaod.execute-api.eu-central-1.amazonaws.com/Prod/user

{
  "first_name": "John",
  "last_name": "Doe",
  "phone_number": "+972123456789",
  "national_id": "1234567891",
  "password": "12345678"
}

Navigate to the AWS Cognito to confirm the user.

2. Login

POST https://mc1qjoxaod.execute-api.eu-central-1.amazonaws.com/Prod/user/login

{
  "national_id": "1234567891",
  "password": "12345678"
}

Copy the access token from the response body or cookie.
And use it in the next request in the Authorization header.

3. Get user

GET https://l59g4gnum0.execute-api.eu-central-1.amazonaws.com/Prod/user/1234567891

4. Update user

PUT https://l59g4gnum0.execute-api.eu-central-1.amazonaws.com/Prod/user

{
  "first_name": "Jane!!!!!",
  "last_name": "Doe",
  "phone_number": "+972123123123",
  "national_id": "1234567891"
}

5. Confirm changes

GET https://l59g4gnum0.execute-api.eu-central-1.amazonaws.com/Prod/user/1234567891

see the name changed to Jane!!!!! and the phone number changed to +972123123123

The assignment

This test is designed to evaluate your proficiency in API gateway and AWS Lambda. Feel free to use any npm packages as needed.

Follow the steps below:

1. Set up a Cognito user pool for managing user registration and authentication.
2. Develop a Lambda function for user registration, which should add the newly registered user to a DynamoDB table. Ensure all fields are saved in both DynamoDB and Cognito. Allowed fields:
   • Fields
     • First name: up to 20 letters
     • Last name: up to 20 letters
     • ID: a valid Israeli ID
     • Phone number: a valid phone number
     • Password: minimum 6 characters
   • Note that all fields are mandatory.
   • If incorrect data is provided, return a 400 HTTP response.
   • If successful, return a 201 HTTP response along with the ID from DynamoDB.
   • Endpoint: POST /user
3. Implement another Lambda function to handle user. This function should verify the user's credentials against the user pool and return a JSON web token (JWT) if the credentials are valid.
   • Endpoint: POST /user/login
4. Create a Lambda function for processing authorized requests. This function should verify a valid JWT in the request headers before permitting the request to proceed and update user data.
   • Endpoint: PUT /user
5. Develop a Lambda function for handling authorized requests. This function should check for a valid JWT in the request headers before allowing the request to proceed and read user data.
   • Endpoint: GET user/{id}
6. Implement a Lambda function to retrieve a user by their ID.
7. Provide a Postman collection along with your code.

References and resources

• Authorize APIs with Cognito UserPool
• Verifying JWT