FastLink

OAuth 2.0 client for various platforms, asynchronous, easy-to-use, extensible

---

---

Features

• All-in-one: Supports popular platforms like Google, Yandex, Telegram, etc.
• Asynchronous: Built on top of httpx is fully asynchronous.
• Easy-to-use: Simple and intuitive API for quick integration.
• Extensible: Easily add support for new platforms or customize existing ones.

Installation

pip install fastlink

Get Started

from typing import Annotated, Any

from fastapi import Depends, FastAPI
from fastapi.responses import RedirectResponse

from examples.config import settings
from fastlink import GoogleSSO
from fastlink.schemas import OAuth2Callback, OpenID

app = FastAPI()

sso = GoogleSSO(
    settings.google_client_id,
    settings.google_client_secret,
    "http://localhost:8000/callback",
)


@app.get("/login")
async def login() -> RedirectResponse:
    async with sso:
        url = await sso.login_url()
        return RedirectResponse(url=url)


@app.get("/callback")
async def callback(call: Annotated[OAuth2Callback, Depends()]) -> OpenID:
    async with sso:
        return await sso.callback(call)

Now you can run the server and visit http://localhost:8000/login to start the OAuth 2.0 flow.

After logging into Google, you will be redirected to the callback URL. The server will then fetch the user's OpenID information and return it as a response.