Starlette Authlib Middleware

Introduction

A drop-in replacement for Starlette session middleware, using authlib's jwt.

Rationale

It is sometimes necessary to integrate a Starlette-based application into more complex scenarios where other actors need to make decisions based on session data. This middleware makes this possible by using a standard JWT token instead of the Starlette-encrypted one, thus simplifying interaction with third-party components.

Requirements

• Python 3.10+
• Starlette 0.9+

Installation

pip install starlette-authlib

Usage

A complete example where we drop-in replace standard session middleware:

from starlette.applications import Starlette

from starlette_authlib.middleware import AuthlibMiddleware as SessionMiddleware


app = Starlette()

app.add_middleware(SessionMiddleware, secret_key='secret')

Other things you can configure either via environment variables or .env file:

• DOMAIN - declare cookie domain. App must be under this domain. If empty, the cookie is restricted to the subdomain of the app (this is useful when you write eg. SSO portals)
• JWT_ALG - one of authlib JWT supported algorithms
• JWT_SECRET - jwt secret. Only useful for HS* algorithms, see the sample_app folder for middleware usage w/ crypto keys.

See it in action: sample application

A sample application is included, and you can run it with either Starlette-based session middleware or this one, just by setting a variable:

# run with vanilla Starlette-based session middleware
VANILLA=1 uvicorn sample_app.app:app

# run with this drop-in replacement
uvicorn sample_app.app:app

As you can notice in code here, the only difference is an import name, based on this VANILLA env var.

Contributing

This project is absolutely open to contributions so if you have a nice idea, create an issue to let the community discuss it.