Auth0 to S3 Backend

What it is

This project demonstrates a backend pattern where user identity is managed by Auth0 and storage is isolated per user in AWS S3. It handles the lifecycle of creating user-specific buckets upon first login and generating temporary credentials or pre-signed URLs for secure file operations, ensuring data separation without managing user passwords directly.

Features

• Auth0 integration for seamless user registration and login
• Automatic provisioning of dedicated S3 buckets for new users
• JWT verification on the backend to secure API endpoints
• Generation of pre-signed URLs for secure, time-limited S3 access
• Database mapping of user emails to specific S3 bucket names

Architecture

flowchart TD
    User[User Browser] -->|Login/Register| Auth0[Auth0 Service]
    Auth0 -->|JWT| User
    User -->|Request with JWT| Backend[Flask Backend]
    Backend -->|Verify JWT| Auth0
    Backend -->|Check/Create Bucket| DB[(User DB)]
    Backend -->|Create Bucket/Get Creds| S3[AWS S3]
    Backend -->|Pre-signed URLs/Creds| User
    User -->|Direct File Access| S3

How it's built

The solution uses a React frontend for authentication flows via @auth0/auth0-react and a Python Flask backend for token verification and AWS logic. The backend verifies JWTs using the `python-jose` library, checks a database for existing bucket mappings, creates new S3 buckets if necessary, and returns access credentials to the client.

How it runs

sequenceDiagram
    participant U as User
    participant A as Auth0
    participant B as Backend (Flask)
    participant D as Database
    participant S as AWS S3

    U->>A: Login/Register
    A-->>U: Return JWT
    U->>B: Request Resource (send JWT)
    B->>A: Verify JWT Signature
    A-->>B: Valid Payload
    B->>D: Check for User Bucket Mapping
    alt No Bucket Exists
        B->>S: Create New S3 Bucket
        S-->>B: Bucket Created
        B->>D: Update User Mapping
    end
    B->>S: Generate Pre-signed URLs/Credentials
    S-->>B: Return Access Credentials
    B-->>U: Return Credentials/URLs
    U->>S: Upload/Download Files

How to apply & reuse

Use this pattern when building multi-tenant applications requiring strict data isolation per user. It is suitable for document management systems, personal media stores, or any application where users need direct, secure access to their own cloud storage namespace without exposing long-term AWS keys.

At a glance