README.rst

@@ -75,7 +75,6 @@ In your ``my_app.py``:
     ... (Configure the Flask application) ...
 
     auth: DigestAuth = DigestAuth(realm="Admin")
-    auth.init_app(app)
 
     @auth.register_get_password
     def get_password_hash(username: str) -> t.Optional[str]:
@@ -114,7 +113,6 @@ In your ``my_app/__init__.py``:
         ... (Configure the Flask application) ...
 
         auth.realm = app.config["REALM"]
-        auth.init_app(app)
 
         @auth.register_get_password
         def get_password_hash(username: str) -> t.Optional[str]:
@@ -158,9 +156,6 @@ module that requires log in, without specifying the authentication
 mechanism.  The Flask application can specify the actual
 authentication mechanism as it sees fit.
 
-``login_manager.init_app(app)`` must be called before
-``auth.init_app(app)``.
-
 
 Example for Simple Applications with Flask-Login Integration
 ------------------------------------------------------------

src/flask_digest_auth/auth.py

@@ -23,12 +23,12 @@ from __future__ import annotations
 
 import sys
 import typing as t
-from abc import ABC, abstractmethod
 from functools import wraps
 from random import random
 from secrets import token_urlsafe
 
-from flask import g, request, Response, session, abort, Flask, Request
+from flask import g, request, Response, session, abort, Flask, Request, \
+    current_app
 from itsdangerous import URLSafeTimedSerializer, BadData
 from werkzeug.datastructures import Authorization
 
@@ -36,36 +36,6 @@ from flask_digest_auth.algo import calc_response
 from flask_digest_auth.exception import UnauthorizedException
 
 
-class BasePasswordHashGetter(ABC):
-    """The base password hash getter."""
-
-    @staticmethod
-    @abstractmethod
-    def __call__(username: str) -> t.Optional[str]:
-        """Returns the password hash of a user.
-
-        :param username: The username.
-        :return: The password hash, or None if the user does not exist.
-        :raise UnboundLocalError: When the password hash getter function is
-            not registered yet.
-        """
-
-
-class BaseUserGetter(ABC):
-    """The base user getter."""
-
-    @staticmethod
-    @abstractmethod
-    def __call__(username: str) -> t.Optional[t.Any]:
-        """Returns a user.
-
-        :param username: The username.
-        :return: The user, or None if the user does not exist.
-        :raise UnboundLocalError: When the user getter function is not
-            registered yet.
-        """
-
-
 class DigestAuth:
     """The HTTP digest authentication."""
 
@@ -82,42 +52,9 @@ class DigestAuth:
         self.use_opaque: bool = True
         self.domain: t.List[str] = []
         self.qop: t.List[str] = ["auth", "auth-int"]
-        self.app: t.Optional[Flask] = None
+        self.__get_password_hash: t.Callable[[str], t.Optional[str]] \
-
+            = lambda x: None
-        class DummyPasswordHashGetter(BasePasswordHashGetter):
+        self.__get_user: t.Callable[[str], t.Optional] = lambda x: None
-            """The dummy password hash getter."""
-
-            @staticmethod
-            def __call__(username: str) -> t.Optional[str]:
-                """Returns the password hash of a user.
-
-                :param username: The username.
-                :return: The password hash, or None if the user does not exist.
-                :raise UnboundLocalError: When the password hash getter function
-                    is not registered yet.
-                """
-                raise UnboundLocalError("The function to return the password"
-                                        " hash was not registered yet.")
-
-        self.__get_password_hash: BasePasswordHashGetter \
-            = DummyPasswordHashGetter()
-
-        class DummyUserGetter(BaseUserGetter):
-            """The dummy user getter."""
-
-            @staticmethod
-            def __call__(username: str) -> t.Optional[t.Any]:
-                """Returns a user.
-
-                :param username: The username.
-                :return: The user, or None if the user does not exist.
-                :raise UnboundLocalError: When the user getter function is not
-                    registered yet.
-                """
-                raise UnboundLocalError("The function to return the user"
-                                        " was not registered yet.")
-
-        self.__get_user: BaseUserGetter = DummyUserGetter()
 
     def login_required(self, view) -> t.Callable:
         """The view decorator for HTTP digest authentication.
@@ -190,8 +127,8 @@ class DigestAuth:
             except BadData:
                 raise UnauthorizedException("Invalid opaque")
             state.opaque = authorization.opaque
-        password_hash: t.Optional[str] \
+        password_hash: t.Optional[str] = self.__get_password_hash(
-            = self.__get_password_hash(authorization.username)
+            authorization.username)
         if password_hash is None:
             raise UnauthorizedException(
                 f"No such user \"{authorization.username}\"")
@@ -250,20 +187,7 @@ class DigestAuth:
             hash, or None if the user does not exist.
         :return: None.
         """
-
+        self.__get_password_hash = func
-        class PasswordHashGetter(BasePasswordHashGetter):
-            """The base password hash getter."""
-
-            @staticmethod
-            def __call__(username: str) -> t.Optional[str]:
-                """Returns the password hash of a user.
-
-                :param username: The username.
-                :return: The password hash, or None if the user does not exist.
-                """
-                return func(username)
-
-        self.__get_password_hash = PasswordHashGetter()
 
     def register_get_user(self, func: t.Callable[[str], t.Optional[t.Any]])\
             -> None:
@@ -273,20 +197,7 @@ class DigestAuth:
             or None if the user does not exist.
         :return: None.
         """
-
+        self.__get_user = func
-        class UserGetter(BaseUserGetter):
-            """The user getter."""
-
-            @staticmethod
-            def __call__(username: str) -> t.Optional[t.Any]:
-                """Returns a user.
-
-                :param username: The username.
-                :return: The user, or None if the user does not exist.
-                """
-                return func(username)
-
-        self.__get_user = UserGetter()
 
     def init_app(self, app: Flask) -> None:
         """Initializes the Flask application.
@@ -294,12 +205,13 @@ class DigestAuth:
         :param app: The Flask application.
         :return: None.
         """
-        app.digest_auth = self
-        self.app = app
 
-        if hasattr(app, "login_manager"):
+        try:
             from flask_login import LoginManager, login_user
 
+            if not hasattr(app, "login_manager"):
+                raise AttributeError(
+                    "Please run the Flask-Login init-app() first")
             login_manager: LoginManager = getattr(app, "login_manager")
 
             @login_manager.unauthorized_handler
@@ -340,7 +252,12 @@ class DigestAuth:
                         app.logger.warning(str(e))
                     return None
 
-    def logout(self) -> None:
+        except ModuleNotFoundError:
+            raise ModuleNotFoundError(
+                "init_app() is only for Flask-Login integration")
+
+    @staticmethod
+    def logout() -> None:
         """Logs out the user.
         This actually causes the next authentication to fail, which forces
         the browser to ask the user for the username and password again.
@@ -350,7 +267,7 @@ class DigestAuth:
         if "user" in session:
             del session["user"]
         try:
-            if hasattr(self.app, "login_manager"):
+            if hasattr(current_app, "login_manager"):
                 from flask_login import logout_user
                 logout_user()
         except ModuleNotFoundError:

tests/test_auth.py

@@ -49,7 +49,6 @@ class AuthenticationTestCase(TestCase):
         app.test_client_class = Client
 
         auth: DigestAuth = DigestAuth(realm=_REALM)
-        auth.init_app(app)
         user_db: t.Dict[str, str] \
             = {_USERNAME: make_password_hash(_REALM, _USERNAME, _PASSWORD)}