User Profile Service

Build a simple user profile management service that exposes HTTP endpoints via AWS Lambda Function URLs.

Requirements

Implement a Lambda function that handles HTTP requests for managing user profiles. The service should:

1. GET /users/<user_id> - Retrieve a user profile by ID

   • Return 200 with user data if found
   • Return 404 if user doesn't exist
   • User data should include: id, name, email

2. POST /users - Create a new user profile

   • Accept JSON body with name and email fields
   • Return 201 with created user data
   • Return 400 if required fields are missing

3. PUT /users/<user_id> - Update an existing user profile

   • Accept JSON body with optional name and/or email fields
   • Return 200 with updated user data
   • Return 404 if user doesn't exist

4. CORS Support - Enable CORS for all endpoints

   • Allow origin: "*"
   • Allow methods: GET, POST, PUT
   • Allow headers: Content-Type

5. Error Handling - Handle validation errors gracefully

   • Return 400 status code with error message for validation failures

Implementation Notes

• Store user data in memory (no database required)
• Use simple string IDs for users (e.g., "1", "2", "3")
• JSON responses should be automatically serialized
• Pre-populate with 2 sample users for testing

Test Cases

• Retrieving an existing user returns 200 with correct user data @test
• Retrieving a non-existent user returns 404 @test
• Creating a user with valid data returns 201 @test
• Creating a user without required fields returns 400 @test
• Updating an existing user returns 200 with updated data @test
• Updating a non-existent user returns 404 @test

Implementation

@generates

API

def lambda_handler(event: dict, context) -> dict:
    """
    Lambda handler for processing Function URL requests.

    Parameters:
    - event: Lambda Function URL event
    - context: Lambda runtime context

    Returns:
    Lambda Function URL response dictionary
    """

Dependencies { .dependencies }

aws-lambda-powertools { .dependency }

Provides event handler support for Lambda Function URLs.