Created
January 26, 2022 07:09
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Sample is authenticated decorator
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| import inspect | |
| from datetime import datetime, time | |
| from functools import wraps | |
| class FakeUser: | |
| def __init__(self, name, id): | |
| self.id = id | |
| self.name = name | |
| def __str__(self): | |
| return f"FakeUser(name={self.name}, id={self.id})" | |
| def _get_user(user_id: int) -> FakeUser | None: | |
| return FakeUser(name="Joe", id=user_id) | |
| class NotAuthenticatedError: | |
| pass | |
| class TokenExpiredError: | |
| pass | |
| def is_authenticated(user_param_name="current_user"): | |
| """Execute function if request contains valid access token.""" | |
| def inner_decorator(f): | |
| user_parameter = inspect.signature(f).parameters.get(user_param_name) | |
| @wraps(f) | |
| def wrapped(*args, **kwargs): | |
| decoded_token = {"some": "fake token payload", "user_id": 1, "exp": 1264486466} | |
| # If it's not a valid token raise NotAuthenticatedError | |
| if datetime.fromtimestamp(decoded_token["exp"]).time() < time(): | |
| raise TokenExpiredError | |
| user = _get_user(decoded_token["user_id"]) | |
| if user is None: | |
| raise NotAuthenticatedError | |
| if user_parameter is not None: | |
| kwargs[user_param_name] = user | |
| return f(*args, **kwargs) | |
| return wrapped | |
| return inner_decorator | |
| @is_authenticated() | |
| def guarded_func(derp0: int, current_user: FakeUser, derp2: int) -> None: | |
| print(f"current_user: {current_user}, derp: {derp0}, derp2: {derp2}") | |
| guarded_func(derp0=0, derp2=2) | |
| @is_authenticated(user_param_name="custom_param_name") | |
| def guarded_func2(custom_param_name: FakeUser) -> None: | |
| print(f"custom_param_name: {custom_param_name}") | |
| guarded_func2() |
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