fix(users): Fix deleting users

Remove all internal references, e.g. sessions, attributes, password reset requests.

Add hook for plugins.

If not deletable remove at least all personal data

flaschengeist/controller/userController.py

@@ -1,5 +1,6 @@
 import secrets
 from io import BytesIO
+from sqlalchemy import exc
 from flask import current_app
 from datetime import datetime, timedelta, timezone
 from flask.helpers import send_file
@@ -168,11 +169,34 @@ def find_user(uid_mail):
     return user
 
 
-def delete(user):
+@Hook
+def delete_user(user: User):
     """Delete given user"""
+    # First let the backend delete the user, as this might fail
     current_app.config["FG_AUTH_BACKEND"].delete_user(user)
+    # Clear all easy relationships
+    user.avatar_ = None
+    user._attributes.clear()
+    user.roles_.clear()
+    user.sessions_.clear()
+    user.reset_requests_.clear()
+    db.session.commit()
+    try:
+        # Delete the user
     db.session.delete(user)
     db.session.commit()
+    except exc.IntegrityError:
+        logger.error("Delete of user failed, there might be ForeignKey contraits from disabled plugins", exec_info=True)
+        # Remove at least all personal data
+        user.userid = f"__deleted_user__{user.id_}"
+        user.display_name = "DELETED USER"
+        user.firstname = ""
+        user.lastname = ""
+        user.birthday = None
+        user.mail = None
+        db.session.commit()
+
+
 
 
 def register(data):

flaschengeist/models/user.py

@@ -5,10 +5,9 @@ from typing import Optional
 from datetime import date, datetime
 from sqlalchemy.orm.collections import attribute_mapped_collection
 
-from flaschengeist.models.image import Image
-
 from ..database import db
 from . import ModelSerializeMixin, UtcDateTime, Serial
+from .image import Image
 
 
 association_table = db.Table(

flaschengeist/plugins/__init__.py

@@ -27,6 +27,11 @@ before_update_user = HookBefore("update_user")
 Args:
     user: User object
 """
+before_delete_user = HookBefore("delete_user")
+"""Hook decorator,this is called before an user gets deleted.
+Args:
+    user: User object
+"""
 
 
 class Plugin:

flaschengeist/plugins/auth_plain/__init__.py

@@ -6,8 +6,7 @@ Flaschengeist database (as User attribute)
 import os
 import hashlib
 import binascii
-from werkzeug.exceptions import BadRequest, NotFound
-
+from werkzeug.exceptions import BadRequest
 from flaschengeist.plugins import AuthPlugin
 from flaschengeist.models.user import User, Role, Permission
 from flaschengeist.database import db
@@ -18,6 +17,8 @@ class AuthPlain(AuthPlugin):
     def post_install(self):
         if User.query.first() is None:
             logger.info("Installing admin user")
+            role = Role.query.filter(Role.name == "Superuser").first()
+            if role is None:
             role = Role(name="Superuser", permissions=Permission.query.all())
             admin = User(
                 userid="admin",

flaschengeist/plugins/users/__init__.py

@@ -2,18 +2,17 @@
 
 Provides routes used to manage users
 """
-from io import BytesIO
 from http.client import NO_CONTENT, CREATED
-from flask import Blueprint, request, jsonify, make_response, Response, send_file
+from flask import Blueprint, request, jsonify, make_response
 from werkzeug.exceptions import BadRequest, Forbidden, MethodNotAllowed, NotFound
 
 from . import permissions
 from flaschengeist import logger
 from flaschengeist.config import config
 from flaschengeist.plugins import Plugin
-from flaschengeist.models.user import User, _Avatar
+from flaschengeist.models.user import User
 from flaschengeist.utils.decorators import login_required, extract_session, headers
-from flaschengeist.controller import userController, imageController as image_controller
+from flaschengeist.controller import userController
 from flaschengeist.utils.HTTP import created, no_content
 from flaschengeist.utils.datetime import from_iso_format
 
@@ -23,6 +22,10 @@ class UsersPlugin(Plugin):
     blueprint = Blueprint(name, __name__)
     permissions = permissions.permissions
 
+    def install(self):
+        userController.install()
+        return super().install()
+
 
 @UsersPlugin.blueprint.route("/users", methods=["POST"])
 def register():
@@ -144,7 +147,7 @@ def delete_avatar(userid, current_session):
     if userid != current_session.user_.userid and not current_session.user_.has_permission(permissions.EDIT):
         raise Forbidden
     userController.delete_avatar(user)
-    return "", NO_CONTENT
+    return no_content()
 
 
 @UsersPlugin.blueprint.route("/users/<userid>", methods=["DELETE"])
@@ -163,8 +166,8 @@ def delete_user(userid, current_session):
     """
     logger.debug("Delete user {{ {} }}".format(userid))
     user = userController.get_user(userid)
-    userController.delete(user)
-    return "", NO_CONTENT
+    userController.delete_user(user)
+    return no_content()
 
 
 @UsersPlugin.blueprint.route("/users/<userid>", methods=["PUT"])
@@ -217,7 +220,7 @@ def edit_user(userid, current_session):
 
     userController.modify_user(user, password, new_password)
     userController.update_user(user)
-    return "", NO_CONTENT
+    return no_content()
 
 
 @UsersPlugin.blueprint.route("/notifications", methods=["GET"])