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"""Functions to check for authorisation."""
from functools import wraps
from typing import Callable, Optional
from flask import g, current_app as app
from gn3.auth import db
from . import privileges as auth_privs
from .errors import AuthorisationError
from ..authentication.users import User
def authorised_p(
privileges: tuple[str],
error_message: str = (
"You lack authorisation to perform requested action"),
user: Optional[User] = None):
"""Authorisation decorator."""
assert len(privileges) > 0, "You must provide at least one privilege"
def __build_authoriser__(func: Callable):
@wraps(func)
def __authoriser__(*args, **kwargs):
the_user = user or (hasattr(g, "user") and g.user)
if the_user:
with db.connection(app.config["AUTH_DB"]) as conn:
user_privileges = tuple(
priv.privilege_id for priv in
auth_privs.user_privileges(conn, the_user))
not_assigned = [
priv for priv in privileges if priv not in user_privileges]
if len(not_assigned) == 0:
return func(*args, **kwargs)
raise AuthorisationError(error_message)
return __authoriser__
return __build_authoriser__
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