This is the documentation of the development version, check the Stable Version documentation.

FastAPI OAuth Client

FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints. It is build on top of Starlette, that means most of the code looks similar with Starlette code. You should first read documentation of:

  1. Web OAuth Clients
  2. Starlette OAuth Client

Here is how you would create a FastAPI application:

from fastapi import FastAPI
from starlette.middleware.sessions import SessionMiddleware

app = FastAPI()
# we need this to save temporary code & state in session
app.add_middleware(SessionMiddleware, secret_key="some-random-string")

Since Authlib starlette requires using request instance, we need to expose that request to Authlib. According to the documentation on Using the Request Directly:

from starlette.requests import Request

@app.get("/login")
def login_via_google(request: Request):
    redirect_uri = 'https://example.com/auth'
    return await oauth.google.authorize_redirect(request, redirect_uri)

@app.get("/auth")
def auth_via_google(request: Request):
    token = await oauth.google.authorize_access_token(request)
    user = await oauth.google.parse_id_token(request, token)
    return dict(user)

All other APIs are the same with Starlette.

FastAPI OAuth 1.0 Client

We have a blog post about how to create Twitter login in FastAPI:

https://blog.authlib.org/2020/fastapi-twitter-login

FastAPI OAuth 2.0 Client

We have a blog post about how to create Google login in FastAPI:

https://blog.authlib.org/2020/fastapi-google-login