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# -*- coding: utf-8 -*-
from flask_login import LoginManager, current_user
from functools import wraps
from werkzeug.exceptions import Forbidden
from itsdangerous import base64_decode, base64_encode
import json
from accounts.app import accounts_app
from typing import Union, Any, Optional
class _compact_json:
@staticmethod
def loads(payload: Union[bytes, str, bytearray]) -> Any:
return json.loads(payload)
@staticmethod
def dumps(obj: Union[list, dict, tuple], **kwargs) -> str:
kwargs.setdefault("ensure_ascii", False)
kwargs.setdefault("separators", (",", ":"))
return json.dumps(obj, **kwargs)
def create_login_manager() -> LoginManager:
login_manager = LoginManager()
login_manager.login_message = "Bitte einloggen"
login_manager.login_view = "login.login"
@login_manager.user_loader
def load_user(user_id: str) -> LoginManager:
try:
username, password = parse_userid(user_id)
return accounts_app.user_backend.auth(username, password)
except (
accounts_app.user_backend.NoSuchUserError,
accounts_app.user_backend.InvalidPasswordError,
):
return None
return login_manager
def create_userid(username: str, password: Optional[str]) -> bytes:
userid = (username, password)
return base64_encode(_compact_json.dumps(userid))
def parse_userid(value: str) -> Any:
return _compact_json.loads(base64_decode(value))
def logout_required(f):
@wraps(f)
def logout_required_(*args, **kwargs):
if current_user.is_authenticated:
raise Forbidden(
"Diese Seite ist nur für nicht eingeloggte Benutzer gedacht!"
)
return f(*args, **kwargs)
return logout_required_
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