FastAPI-Login tries to provide similar functionality as Flask-Login does.
$ pip install fastapi-loginTo begin we have to setup our FastAPI app:
from fastapi import FastAPI
SECRET = "your-secret-key"
app = FastAPI()To obtain a suitable secret key you can run import os; print(os.urandom(24).hex()).
Now we can import and setup the LoginManager, which will handle the process of encoding and decoding our Json Web Tokens.
from fastapi_login import LoginManager
manager = LoginManager(SECRET, tokenUrl='/auth/token')For the example we will use a dictionary to represent our user database. In your application this could also be a real database like sqlite or Postgres. It does not matter as you have to provide the function which retrieves the user.
fake_db = {'[email protected]': {'password': 'hunter2'}}Now we have to provide the LoginManager with a way to load our user. The
user_loader callback should either return your user object or None
@manager.user_loader
def load_user(email: str): # could also be an asynchronous function
user = fake_db.get(email)
return userNow we have to define a way to let the user login in our app. Therefore we will create a new route:
from fastapi import Depends
from fastapi.security import OAuth2PasswordRequestForm
from fastapi_login.exceptions import InvalidCredentialsException
@app.post('/auth/token')
def login(data: OAuth2PasswordRequestForm = Depends()):
email = data.username
password = data.password
user = load_user(email) # we are using the same function to retrieve the user
if not user:
raise InvalidCredentialsException # you can also use your own HTTPException
elif password != user['password']:
raise InvalidCredentialsException
access_token = manager.create_access_token(
data=dict(sub=email)
)
return {'access_token': access_token, 'token_type': 'bearer'}Now whenever you want your user to be logged in to use a route, you can simply
use your LoginManager instance as a dependency.
@app.get('/protected')
def protected_route(user=Depends(manager)):
...If you also want to handle a not authenticated error, you can add your own subclass of Exception to the LoginManager.
from starlette.responses import RedirectResponse
class NotAuthenticatedException(Exception):
pass
# these two argument are mandatory
def exc_handler(request, exc):
return RedirectResponse(url='/login')
manager.not_authenticated_exception = NotAuthenticatedException
# You also have to add an exception handler to the your app instance
app.add_exception_handler(NotAuthenticatedException, exc_handler)
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