mpt-fastapi-oauth 0.1.0

Generic OAuth2 authorization-code login for FastAPI, with pluggable user storage and JWT sessions

mpt-fastapi-oauth

mptauth - generic OAuth2 (authorization-code) login for FastAPI.

Works against any spec-compliant OAuth2/OIDC provider (Google, GitHub, Keycloak, Auth0, or a custom in-house IdP) by configuring its endpoints explicitly. After the provider redirect completes, mptauth hands the user's profile to a host-supplied resolve_user hook (so you control how/where users are stored) and issues its own short-lived session JWT.

Usage

from fastapi import Depends, FastAPI
from mptauth import (
    OAuth2Client,
    OAuth2ProviderConfig,
    TokenIssuer,
    build_current_user_dependency,
    build_oauth_router,
)

provider = OAuth2ProviderConfig(
    client_id="...",
    client_secret="...",
    base_url="https://provider.example.com",
    redirect_uri="https://myapp.example.com/auth/callback",
    scopes=("openid", "profile", "email"),
    # authorize_path / token_path / userinfo_path default to the
    # Django OAuth Toolkit-style "/o/authorize", "/o/token/",
    # "/api/v1/account/me/" - override them if your provider differs
)
client = OAuth2Client(provider)
issuer = TokenIssuer(secret_key="change-me", expire_minutes=60 * 24)


def resolve_user(profile: dict) -> dict:
    # Map the provider profile to local user claims. Look the user up (or
    # create it) in your own storage here; mptauth doesn't dictate storage.
    return {"sub": profile["email"], "name": profile.get("name")}


app = FastAPI()
app.include_router(build_oauth_router(client=client, issuer=issuer, resolve_user=resolve_user))

get_current_user = build_current_user_dependency(issuer)


@app.get("/me")
def me(user: dict = Depends(get_current_user)):
    return user

This exposes:

• GET /auth/login - redirects the browser to the provider's authorize endpoint
• GET /auth/callback - exchanges the code, resolves the user, and returns {"access_token", "token_type"}
• Depends(get_current_user) - verifies the session JWT on protected routes