From e2254b71b097a7262523683882cae20a4a7c449f Mon Sep 17 00:00:00 2001
From: Ferdinand Thiessen <rpm@fthiessen.de>
Date: Thu, 25 Aug 2022 15:14:11 +0200
Subject: [PATCH] [core][plugin] Unify plugin model and real plugins

Plugins are now extensions of the database model,
allowing plugins to access all their properties.

Signed-off-by: Ferdinand Thiessen <rpm@fthiessen.de>
---
 ...ial.py => 20482a003db8_initial_core_db.py} | 107 +++++++-----
 flaschengeist/app.py                          |  21 +--
 flaschengeist/cli/install_cmd.py              |  10 +-
 flaschengeist/cli/plugin_cmd.py               | 160 ++++++++++--------
 flaschengeist/controller/pluginController.py  | 142 +++++++---------
 flaschengeist/controller/userController.py    |  96 +++++------
 flaschengeist/database/types.py               |   9 +-
 flaschengeist/models/plugin.py                |  70 ++++++--
 flaschengeist/models/user.py                  |   9 +-
 flaschengeist/plugins/__init__.py             | 145 ++++++----------
 flaschengeist/plugins/auth/__init__.py        |   4 +-
 flaschengeist/plugins/auth_plain/__init__.py  |  49 +++---
 flaschengeist/plugins/message_mail.py         |   4 +-
 flaschengeist/plugins/roles/__init__.py       |   8 +-
 flaschengeist/plugins/scheduler.py            |   9 +-
 flaschengeist/plugins/users/__init__.py       |   8 +-
 16 files changed, 434 insertions(+), 417 deletions(-)
 rename flaschengeist/alembic/migrations/{255b93b6beed_flaschengeist_initial.py => 20482a003db8_initial_core_db.py} (57%)

diff --git a/flaschengeist/alembic/migrations/255b93b6beed_flaschengeist_initial.py b/flaschengeist/alembic/migrations/20482a003db8_initial_core_db.py
similarity index 57%
rename from flaschengeist/alembic/migrations/255b93b6beed_flaschengeist_initial.py
rename to flaschengeist/alembic/migrations/20482a003db8_initial_core_db.py
index b18a71e..a2a2445 100644
--- a/flaschengeist/alembic/migrations/255b93b6beed_flaschengeist_initial.py
+++ b/flaschengeist/alembic/migrations/20482a003db8_initial_core_db.py
@@ -1,8 +1,8 @@
-"""Flaschengeist: Initial
+"""Initial core db
 
-Revision ID: 255b93b6beed
+Revision ID: 20482a003db8
 Revises: 
-Create Date: 2022-02-23 14:33:02.851388
+Create Date: 2022-08-25 15:13:34.900996
 
 """
 from alembic import op
@@ -11,24 +11,17 @@ import flaschengeist
 
 
 # revision identifiers, used by Alembic.
-revision = "255b93b6beed"
+revision = "20482a003db8"
 down_revision = None
 branch_labels = ("flaschengeist",)
 depends_on = None
 
 
 def upgrade():
-    op.create_table(
-        "plugin_setting",
-        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
-        sa.Column("plugin", sa.String(length=127), nullable=True),
-        sa.Column("name", sa.String(length=127), nullable=False),
-        sa.Column("value", sa.PickleType(protocol=4), nullable=True),
-        sa.PrimaryKeyConstraint("id", name=op.f("pk_plugin_setting")),
-    )
+    # ### commands auto generated by Alembic - please adjust! ###
     op.create_table(
         "image",
-        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("id", flaschengeist.database.types.Serial(), nullable=False),
         sa.Column("filename", sa.String(length=255), nullable=False),
         sa.Column("mimetype", sa.String(length=127), nullable=False),
         sa.Column("thumbnail", sa.String(length=255), nullable=True),
@@ -36,27 +29,37 @@ def upgrade():
         sa.PrimaryKeyConstraint("id", name=op.f("pk_image")),
     )
     op.create_table(
-        "permission",
-        sa.Column("name", sa.String(length=30), nullable=True),
-        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
-        sa.PrimaryKeyConstraint("id", name=op.f("pk_permission")),
-        sa.UniqueConstraint("name", name=op.f("uq_permission_name")),
+        "plugin",
+        sa.Column("id", flaschengeist.database.types.Serial(), nullable=False),
+        sa.Column("name", sa.String(length=127), nullable=False),
+        sa.Column("version", sa.String(length=30), nullable=False),
+        sa.Column("enabled", sa.Boolean(), nullable=True),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_plugin")),
     )
     op.create_table(
         "role",
-        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("id", flaschengeist.database.types.Serial(), nullable=False),
         sa.Column("name", sa.String(length=30), nullable=True),
         sa.PrimaryKeyConstraint("id", name=op.f("pk_role")),
         sa.UniqueConstraint("name", name=op.f("uq_role_name")),
     )
     op.create_table(
-        "role_x_permission",
-        sa.Column("role_id", flaschengeist.models.Serial(), nullable=True),
-        sa.Column("permission_id", flaschengeist.models.Serial(), nullable=True),
-        sa.ForeignKeyConstraint(
-            ["permission_id"], ["permission.id"], name=op.f("fk_role_x_permission_permission_id_permission")
-        ),
-        sa.ForeignKeyConstraint(["role_id"], ["role.id"], name=op.f("fk_role_x_permission_role_id_role")),
+        "permission",
+        sa.Column("name", sa.String(length=30), nullable=True),
+        sa.Column("id", flaschengeist.database.types.Serial(), nullable=False),
+        sa.Column("plugin", flaschengeist.database.types.Serial(), nullable=True),
+        sa.ForeignKeyConstraint(["plugin"], ["plugin.id"], name=op.f("fk_permission_plugin_plugin")),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_permission")),
+        sa.UniqueConstraint("name", name=op.f("uq_permission_name")),
+    )
+    op.create_table(
+        "plugin_setting",
+        sa.Column("id", flaschengeist.database.types.Serial(), nullable=False),
+        sa.Column("plugin", flaschengeist.database.types.Serial(), nullable=True),
+        sa.Column("name", sa.String(length=127), nullable=False),
+        sa.Column("value", sa.PickleType(), nullable=True),
+        sa.ForeignKeyConstraint(["plugin"], ["plugin.id"], name=op.f("fk_plugin_setting_plugin_plugin")),
+        sa.PrimaryKeyConstraint("id", name=op.f("pk_plugin_setting")),
     )
     op.create_table(
         "user",
@@ -67,48 +70,58 @@ def upgrade():
         sa.Column("deleted", sa.Boolean(), nullable=True),
         sa.Column("birthday", sa.Date(), nullable=True),
         sa.Column("mail", sa.String(length=60), nullable=True),
-        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
-        sa.Column("avatar", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("id", flaschengeist.database.types.Serial(), nullable=False),
+        sa.Column("avatar", flaschengeist.database.types.Serial(), nullable=True),
         sa.ForeignKeyConstraint(["avatar"], ["image.id"], name=op.f("fk_user_avatar_image")),
         sa.PrimaryKeyConstraint("id", name=op.f("pk_user")),
         sa.UniqueConstraint("userid", name=op.f("uq_user_userid")),
     )
     op.create_table(
         "notification",
-        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
-        sa.Column("plugin", sa.String(length=127), nullable=False),
+        sa.Column("id", flaschengeist.database.types.Serial(), nullable=False),
         sa.Column("text", sa.Text(), nullable=True),
         sa.Column("data", sa.PickleType(), nullable=True),
-        sa.Column("time", flaschengeist.models.UtcDateTime(), nullable=False),
-        sa.Column("user_id", flaschengeist.models.Serial(), nullable=False),
-        sa.ForeignKeyConstraint(["user_id"], ["user.id"], name=op.f("fk_notification_user_id_user")),
+        sa.Column("time", flaschengeist.database.types.UtcDateTime(), nullable=False),
+        sa.Column("user", flaschengeist.database.types.Serial(), nullable=False),
+        sa.Column("plugin", flaschengeist.database.types.Serial(), nullable=False),
+        sa.ForeignKeyConstraint(["plugin"], ["plugin.id"], name=op.f("fk_notification_plugin_plugin")),
+        sa.ForeignKeyConstraint(["user"], ["user.id"], name=op.f("fk_notification_user_user")),
         sa.PrimaryKeyConstraint("id", name=op.f("pk_notification")),
     )
     op.create_table(
         "password_reset",
-        sa.Column("user", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("user", flaschengeist.database.types.Serial(), nullable=False),
         sa.Column("token", sa.String(length=32), nullable=True),
-        sa.Column("expires", flaschengeist.models.UtcDateTime(), nullable=True),
+        sa.Column("expires", flaschengeist.database.types.UtcDateTime(), nullable=True),
         sa.ForeignKeyConstraint(["user"], ["user.id"], name=op.f("fk_password_reset_user_user")),
         sa.PrimaryKeyConstraint("user", name=op.f("pk_password_reset")),
     )
+    op.create_table(
+        "role_x_permission",
+        sa.Column("role_id", flaschengeist.database.types.Serial(), nullable=True),
+        sa.Column("permission_id", flaschengeist.database.types.Serial(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["permission_id"], ["permission.id"], name=op.f("fk_role_x_permission_permission_id_permission")
+        ),
+        sa.ForeignKeyConstraint(["role_id"], ["role.id"], name=op.f("fk_role_x_permission_role_id_role")),
+    )
     op.create_table(
         "session",
-        sa.Column("expires", flaschengeist.models.UtcDateTime(), nullable=True),
+        sa.Column("expires", flaschengeist.database.types.UtcDateTime(), nullable=True),
         sa.Column("token", sa.String(length=32), nullable=True),
         sa.Column("lifetime", sa.Integer(), nullable=True),
-        sa.Column("browser", sa.String(length=30), nullable=True),
-        sa.Column("platform", sa.String(length=30), nullable=True),
-        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
-        sa.Column("user_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("browser", sa.String(length=127), nullable=True),
+        sa.Column("platform", sa.String(length=64), nullable=True),
+        sa.Column("id", flaschengeist.database.types.Serial(), nullable=False),
+        sa.Column("user_id", flaschengeist.database.types.Serial(), nullable=True),
         sa.ForeignKeyConstraint(["user_id"], ["user.id"], name=op.f("fk_session_user_id_user")),
         sa.PrimaryKeyConstraint("id", name=op.f("pk_session")),
         sa.UniqueConstraint("token", name=op.f("uq_session_token")),
     )
     op.create_table(
         "user_attribute",
-        sa.Column("id", flaschengeist.models.Serial(), nullable=False),
-        sa.Column("user", flaschengeist.models.Serial(), nullable=False),
+        sa.Column("id", flaschengeist.database.types.Serial(), nullable=False),
+        sa.Column("user", flaschengeist.database.types.Serial(), nullable=False),
         sa.Column("name", sa.String(length=30), nullable=True),
         sa.Column("value", sa.PickleType(), nullable=True),
         sa.ForeignKeyConstraint(["user"], ["user.id"], name=op.f("fk_user_attribute_user_user")),
@@ -116,8 +129,8 @@ def upgrade():
     )
     op.create_table(
         "user_x_role",
-        sa.Column("user_id", flaschengeist.models.Serial(), nullable=True),
-        sa.Column("role_id", flaschengeist.models.Serial(), nullable=True),
+        sa.Column("user_id", flaschengeist.database.types.Serial(), nullable=True),
+        sa.Column("role_id", flaschengeist.database.types.Serial(), nullable=True),
         sa.ForeignKeyConstraint(["role_id"], ["role.id"], name=op.f("fk_user_x_role_role_id_role")),
         sa.ForeignKeyConstraint(["user_id"], ["user.id"], name=op.f("fk_user_x_role_user_id_user")),
     )
@@ -129,11 +142,13 @@ def downgrade():
     op.drop_table("user_x_role")
     op.drop_table("user_attribute")
     op.drop_table("session")
+    op.drop_table("role_x_permission")
     op.drop_table("password_reset")
     op.drop_table("notification")
     op.drop_table("user")
-    op.drop_table("role_x_permission")
-    op.drop_table("role")
+    op.drop_table("plugin_setting")
     op.drop_table("permission")
+    op.drop_table("role")
+    op.drop_table("plugin")
     op.drop_table("image")
     # ### end Alembic commands ###
diff --git a/flaschengeist/app.py b/flaschengeist/app.py
index ee8a6bd..d490965 100644
--- a/flaschengeist/app.py
+++ b/flaschengeist/app.py
@@ -4,7 +4,7 @@ from flask import Flask
 from flask_cors import CORS
 from datetime import datetime, date
 from flask.json import JSONEncoder, jsonify
-from importlib.metadata import entry_points
+from sqlalchemy.exc import OperationalError
 from werkzeug.exceptions import HTTPException
 
 from flaschengeist import logger
@@ -37,21 +37,13 @@ class CustomJSONEncoder(JSONEncoder):
 @Hook("plugins.loaded")
 def load_plugins(app: Flask):
     app.config["FG_PLUGINS"] = {}
-    all_plugins = entry_points(group="flaschengeist.plugins")
 
     for plugin in pluginController.get_enabled_plugins():
         logger.debug(f"Searching for enabled plugin {plugin.name}")
-        entry_point = all_plugins.select(name=plugin.name)
-        if not entry_point:
-            logger.error(
-                f"Plugin {plugin.name} was enabled, but could not be found.",
-                exc_info=True,
-            )
-            continue
         try:
-            loaded = entry_point[0].load()(entry_point[0])
-            if hasattr(plugin, "blueprint") and plugin.blueprint is not None:
-                app.register_blueprint(plugin.blueprint)
+            cls = plugin.entry_point.load()
+            if hasattr(cls, "blueprint") and cls.blueprint is not None:
+                app.register_blueprint(cls.blueprint)
         except:
             logger.error(
                 f"Plugin {plugin.name} was enabled, but could not be loaded due to an error.",
@@ -59,7 +51,8 @@ def load_plugins(app: Flask):
             )
             continue
         logger.info(f"Loaded plugin: {plugin.name}")
-        app.config["FG_PLUGINS"][plugin.name] = loaded
+        app.config["FG_PLUGINS"][plugin.name] = cls.query.get(plugin.id) if plugin.id is not None else plugin
+        app.config["FG_PLUGINS"][plugin.name].load()
 
 
 def create_app(test_config=None, cli=False):
@@ -79,7 +72,7 @@ def create_app(test_config=None, cli=False):
     def __get_state():
         from . import __version__ as version
 
-        return jsonify({"plugins": app.config["FG_PLUGINS"], "version": version})
+        return jsonify({"plugins": pluginController.get_loaded_plugins(), "version": version})
 
     @app.errorhandler(Exception)
     def handle_exception(e):
diff --git a/flaschengeist/cli/install_cmd.py b/flaschengeist/cli/install_cmd.py
index e566163..e1e9244 100644
--- a/flaschengeist/cli/install_cmd.py
+++ b/flaschengeist/cli/install_cmd.py
@@ -4,7 +4,7 @@ from flask.cli import with_appcontext
 from flask_migrate import upgrade
 
 from flaschengeist.alembic import alembic_migrations_path
-from flaschengeist.cli.plugin_cmd import install_plugin_command
+from flaschengeist.controller import pluginController
 from flaschengeist.utils.hook import Hook
 
 
@@ -12,9 +12,13 @@ from flaschengeist.utils.hook import Hook
 @with_appcontext
 @pass_context
 @Hook("plugins.installed")
-def install(ctx):
+def install(ctx: click.Context):
+    plugins = pluginController.get_enabled_plugins()
+
     # Install database
     upgrade(alembic_migrations_path, revision="heads")
 
     # Install plugins
-    install_plugin_command(ctx, [], True)
+    for plugin in plugins:
+        plugin = pluginController.install_plugin(plugin.name)
+        pluginController.enable_plugin(plugin.id)
diff --git a/flaschengeist/cli/plugin_cmd.py b/flaschengeist/cli/plugin_cmd.py
index d8b90c4..5356eac 100644
--- a/flaschengeist/cli/plugin_cmd.py
+++ b/flaschengeist/cli/plugin_cmd.py
@@ -1,12 +1,13 @@
+import traceback
 import click
 from click.decorators import pass_context
 from flask import current_app
 from flask.cli import with_appcontext
 from importlib.metadata import EntryPoint, entry_points
 
-from flaschengeist.database import db
-from flaschengeist.config import config
-from flaschengeist.models import Permission
+from flaschengeist import logger
+from flaschengeist.controller import pluginController
+from werkzeug.exceptions import NotFound
 
 
 @click.group()
@@ -14,33 +15,34 @@ def plugin():
     pass
 
 
-def install_plugin_command(ctx, plugin, all):
-    """Install one or more plugins"""
-    if not all and len(plugin) == 0:
-        ctx.fail("At least one plugin must be specified, or use `--all` flag.")
-
-    if all:
-        plugins = current_app.config["FG_PLUGINS"]
-    else:
+@plugin.command()
+@click.argument("plugin", nargs=-1, required=True, type=str)
+@with_appcontext
+@pass_context
+def enable(ctx, plugin):
+    """Enable one or more plugins"""
+    for name in plugin:
+        click.echo(f"Enabling {name}{'.'*(20-len(name))}", nl=False)
         try:
-            plugins = {plugin_name: current_app.config["FG_PLUGINS"][plugin_name] for plugin_name in plugin}
-        except KeyError as e:
-            ctx.fail(f"Invalid plugin name, could not find >{e.args[0]}<")
+            pluginController.enable_plugin(name)
+            click.secho(" ok", fg="green")
+        except NotFound:
+            click.secho(" not installed / not found", fg="red")
 
-    for name, plugin in plugins.items():
-        click.echo(f"Installing {name}{'.'*(20-len(name))}", nl=False)
-        # Install permissions
-        if plugin.permissions:
-            cur_perm = set(x.name for x in Permission.query.filter(Permission.name.in_(plugin.permissions)).all())
-            all_perm = set(plugin.permissions)
 
-            add = all_perm - cur_perm
-            if add:
-                db.session.bulk_save_objects([Permission(name=x) for x in all_perm])
-                db.session.commit()
-        # Custom installation steps
-        plugin.install()
-        click.secho(" ok", fg="green")
+@plugin.command()
+@click.argument("plugin", nargs=-1, required=True, type=str)
+@with_appcontext
+@pass_context
+def disable(ctx, plugin):
+    """Disable one or more plugins"""
+    for name in plugin:
+        click.echo(f"Disabling {name}{'.'*(20-len(name))}", nl=False)
+        try:
+            pluginController.disable_plugin(name)
+            click.secho(" ok", fg="green")
+        except NotFound:
+            click.secho(" not installed / not found", fg="red")
 
 
 @plugin.command()
@@ -48,42 +50,62 @@ def install_plugin_command(ctx, plugin, all):
 @click.option("--all", help="Install all enabled plugins", is_flag=True)
 @with_appcontext
 @pass_context
-def install(ctx, plugin, all):
+def install(ctx: click.Context, plugin, all):
     """Install one or more plugins"""
-    return install_plugin_command(ctx, plugin, all)
+    all_plugins = entry_points(group="flaschengeist.plugins")
+
+    if all:
+        plugins = [ep.name for ep in all_plugins]
+    elif len(plugin) > 0:
+        plugins = plugin
+        for name in plugin:
+            if not all_plugins.select(name=name):
+                ctx.fail(f"Invalid plugin name, could not find >{name}<")
+    else:
+        ctx.fail("At least one plugin must be specified, or use `--all` flag.")
+
+    for name in plugins:
+        click.echo(f"Installing {name}{'.'*(20-len(name))}", nl=False)
+        try:
+            pluginController.install_plugin(name)
+        except Exception as e:
+            click.secho(" failed", fg="red")
+            if logger.getEffectiveLevel() > 10:
+                ctx.fail(f"[{e.__class__.__name__}] {e}")
+            else:
+                ctx.fail(traceback.format_exc())
+        else:
+            click.secho(" ok", fg="green")
 
 
 @plugin.command()
-@click.argument("plugin", nargs=-1, type=str)
+@click.argument("plugin", nargs=-1, required=True, type=str)
 @with_appcontext
 @pass_context
 def uninstall(ctx: click.Context, plugin):
     """Uninstall one or more plugins"""
 
-    if len(plugin) == 0:
-        ctx.fail("At least one plugin must be specified")
-
+    plugins = {plg.name: plg for plg in pluginController.get_installed_plugins() if plg.name in plugin}
     try:
-        plugins = {plugin_name: current_app.config["FG_PLUGINS"][plugin_name] for plugin_name in plugin}
-    except KeyError as e:
-        ctx.fail(f"Invalid plugin ID, could not find >{e.args[0]}<")
-
-    if (
-        click.prompt(
-            "You are going to uninstall:\n\n"
-            f"\t{', '.join([plugin_name for plugin_name in plugins.keys()])}\n\n"
-            "Are you sure?",
-            default="n",
-            show_choices=True,
-            type=click.Choice(["y", "N"], False),
-        ).lower()
-        != "y"
-    ):
-        ctx.exit()
-    for name, plugin in plugins.items():
-        click.echo(f"Uninstalling {name}{'.'*(20-len(name))}", nl=False)
-        plugin.uninstall()
-        click.secho(" ok", fg="green")
+        for name in plugin:
+            pluginController.disable_plugin(plugins[name])
+            if (
+                click.prompt(
+                    "You are going to uninstall:\n\n"
+                    f"\t{', '.join([plugin_name for plugin_name in plugins.keys()])}\n\n"
+                    "Are you sure?",
+                    default="n",
+                    show_choices=True,
+                    type=click.Choice(["y", "N"], False),
+                ).lower()
+                != "y"
+            ):
+                ctx.exit()
+            click.echo(f"Uninstalling {name}{'.'*(20-len(name))}", nl=False)
+            pluginController.uninstall_plugin(plugins[name])
+            click.secho(" ok", fg="green")
+    except KeyError:
+        ctx.fail(f"Invalid plugin ID, could not find >{name}<")
 
 
 @plugin.command()
@@ -97,21 +119,27 @@ def ls(enabled, no_header):
         return p.version
 
     plugins = entry_points(group="flaschengeist.plugins")
-    enabled_plugins = [key for key, value in config.items() if "enabled" in value and value["enabled"]] + [
-        config["FLASCHENGEIST"]["auth"]
-    ]
+    installed_plugins = {plg.name: plg for plg in pluginController.get_installed_plugins()}
     loaded_plugins = current_app.config["FG_PLUGINS"].keys()
 
     if not no_header:
-        print(f"{' '*13}{'name': <20}|{'version': >10}")
-        print("-" * 46)
+        print(f"{' '*13}{'name': <20}|   version   | {' ' * 8} state")
+        print("-" * 63)
     for plugin in plugins:
-        if enabled and plugin.name not in enabled_plugins:
+        is_installed = plugin.name in installed_plugins.keys()
+        is_enabled = is_installed and installed_plugins[plugin.name].enabled
+        if enabled and is_enabled:
             continue
-        print(
-            f"{plugin.name: <33}|{plugin_version(plugin): >12}"
-            f"{click.style(' (enabled)', fg='green') if plugin.name in enabled_plugins else ' (disabled)'}"
-        )
-
-    for plugin in [value for value in enabled_plugins if value not in loaded_plugins]:
-        print(f"{plugin: <33}|{' '*12}" f"{click.style(' (not found)', fg='red')}")
+        print(f"{plugin.name: <33}|{plugin_version(plugin): >12} |  ", end="")
+        if is_enabled:
+            if plugin.name in loaded_plugins:
+                print(click.style("      enabled", fg="green"))
+            else:
+                print(click.style("(failed to load)", fg="red"))
+        elif is_installed:
+            print(click.style("     disabled", fg="yellow"))
+        else:
+            print("not installed")
+    for name, plugin in installed_plugins.items():
+        if plugin.enabled and name not in loaded_plugins:
+            print(f"{name: <33}|{'': >12} |" f"{click.style(' failed to load', fg='red')}")
diff --git a/flaschengeist/controller/pluginController.py b/flaschengeist/controller/pluginController.py
index 86ea301..7cccc4e 100644
--- a/flaschengeist/controller/pluginController.py
+++ b/flaschengeist/controller/pluginController.py
@@ -3,84 +3,58 @@
 Used by plugins for setting and notification functionality.
 """
 
-import sqlalchemy
-
 from typing import Union
 from flask import current_app
-from werkzeug.exceptions import NotFound
+from werkzeug.exceptions import NotFound, BadRequest
 from sqlalchemy.exc import OperationalError
 from importlib.metadata import entry_points
 
+from flaschengeist import version as flaschengeist_version
+
 from .. import logger
 from ..database import db
 from ..utils.hook import Hook
-from ..models import Plugin, PluginSetting, Notification
+from ..plugins import Plugin, AuthPlugin
+from ..models import Notification
 
 
-def get_enabled_plugins():
+__required_plugins = ["users", "roles", "scheduler", "auth"]
+
+
+def get_authentication_provider():
+    return [plugin for plugin in get_loaded_plugins().values() if isinstance(plugin, AuthPlugin)]
+
+
+def get_loaded_plugins(plugin_name: str = None):
+    """Get loaded plugin(s)"""
+    plugins = current_app.config["FG_PLUGINS"]
+    if plugin_name is not None:
+        plugins = [plugins[plugin_name]]
+    return {name: db.session.merge(plugins[name], load=False) for name in plugins}
+
+
+def get_installed_plugins() -> list[Plugin]:
+    """Get all installed plugins"""
+    return Plugin.query.all()
+
+
+def get_enabled_plugins() -> list[Plugin]:
+    """Get all installed and enabled plugins"""
     try:
         enabled_plugins = Plugin.query.filter(Plugin.enabled == True).all()
     except OperationalError as e:
-
-        class PluginStub:
-            def __init__(self, name) -> None:
-                self.name = name
-                self.version = "?"
-
         logger.error("Could not connect to database or database not initialized! No plugins enabled!")
         logger.debug("Can not query enabled plugins", exc_info=True)
+        # Fake load required plugins so the database can at least be installed
         enabled_plugins = [
-            PluginStub("auth"),
-            PluginStub("roles"),
-            PluginStub("users"),
-            PluginStub("scheduler"),
+            entry_points(group="flaschengeist.plugins", name=name)[0].load()(
+                name=name, enabled=True, installed_version=flaschengeist_version
+            )
+            for name in __required_plugins
         ]
     return enabled_plugins
 
 
-def get_setting(plugin_id: str, name: str, **kwargs):
-    """Get plugin setting from database
-
-    Args:
-        plugin_id: ID of the plugin
-        name: string identifying the setting
-        default: Default value
-    Returns:
-        Value stored in database (native python)
-    Raises:
-        `KeyError` if no such setting exists in the database
-    """
-    try:
-        setting = PluginSetting.query.filter(PluginSetting.plugin == plugin_id).filter(PluginSetting.name == name).one()
-        return setting.value
-    except sqlalchemy.orm.exc.NoResultFound:
-        if "default" in kwargs:
-            return kwargs["default"]
-        else:
-            raise KeyError
-
-
-def set_setting(plugin_id: str, name: str, value):
-    """Save setting in database
-
-    Args:
-        plugin_id: ID of the plugin
-        name: String identifying the setting
-        value: Value to be stored
-    """
-    setting = (
-        PluginSetting.query.filter(PluginSetting.plugin == plugin_id).filter(PluginSetting.name == name).one_or_none()
-    )
-    if setting is not None:
-        if value is None:
-            db.session.delete(setting)
-        else:
-            setting.value = value
-    else:
-        db.session.add(PluginSetting(plugin=plugin_id, name=name, value=value))
-    db.session.commit()
-
-
 def notify(plugin_id: str, user, text: str, data=None):
     """Create a new notification for an user
 
@@ -108,55 +82,67 @@ def install_plugin(plugin_name: str):
     if not entry_point:
         raise NotFound
 
-    plugin = entry_point[0].load()(entry_point[0])
-    entity = Plugin(name=plugin.name, version=plugin.version)
-    db.session.add(entity)
+    cls = entry_point[0].load()
+    plugin = cls.query.filter(Plugin.name == plugin_name).one_or_none()
+    if plugin is None:
+        plugin = cls(name=plugin_name, installed_version=entry_point[0].dist.version)
+        db.session.add(plugin)
+    db.session.flush()
+    # Custom installation steps
+    plugin.install()
     db.session.commit()
-    return entity
+
+    return plugin
 
 
 @Hook("plugin.uninstalled")
-def uninstall_plugin(plugin_id: Union[str, int]):
+def uninstall_plugin(plugin_id: Union[str, int, Plugin]):
     plugin = disable_plugin(plugin_id)
     logger.debug(f"Uninstall plugin {plugin.name}")
-
-    entity = current_app.config["FG_PLUGINS"][plugin.name]
-    entity.uninstall()
-    del current_app.config["FG_PLUGINS"][plugin.name]
+    plugin.uninstall()
     db.session.delete(plugin)
     db.session.commit()
 
 
 @Hook("plugins.enabled")
-def enable_plugin(plugin_id: Union[str, int]):
+def enable_plugin(plugin_id: Union[str, int]) -> Plugin:
     logger.debug(f"Enabling plugin {plugin_id}")
-    plugin: Plugin = Plugin.query
+    plugin = Plugin.query
     if isinstance(plugin_id, str):
         plugin = plugin.filter(Plugin.name == plugin_id).one_or_none()
-        if plugin is None:
-            logger.debug("Plugin not installed, trying to install")
-            plugin = install_plugin(plugin_id)
-    else:
+    elif isinstance(plugin_id, int):
         plugin = plugin.get(plugin_id)
-        if plugin is None:
-            raise NotFound
+    else:
+        raise TypeError
+    if plugin is None:
+        raise NotFound
     plugin.enabled = True
     db.session.commit()
-
+    plugin = plugin.entry_point.load().query.get(plugin.id)
+    current_app.config["FG_PLUGINS"][plugin.name] = plugin
     return plugin
 
 
 @Hook("plugins.disabled")
-def disable_plugin(plugin_id: Union[str, int]):
+def disable_plugin(plugin_id: Union[str, int, Plugin]):
     logger.debug(f"Disabling plugin {plugin_id}")
     plugin: Plugin = Plugin.query
     if isinstance(plugin_id, str):
         plugin = plugin.filter(Plugin.name == plugin_id).one_or_none()
-    else:
+    elif isinstance(plugin_id, int):
         plugin = plugin.get(plugin_id)
+    elif isinstance(plugin_id, Plugin):
+        plugin = plugin_id
+    else:
+        raise TypeError
     if plugin is None:
         raise NotFound
+    if plugin.name in __required_plugins:
+        raise BadRequest
     plugin.enabled = False
     db.session.commit()
 
+    if plugin.name in current_app.config["FG_PLUGINS"].keys():
+        del current_app.config["FG_PLUGINS"][plugin.name]
+
     return plugin
diff --git a/flaschengeist/controller/userController.py b/flaschengeist/controller/userController.py
index 610db39..520ec31 100644
--- a/flaschengeist/controller/userController.py
+++ b/flaschengeist/controller/userController.py
@@ -3,7 +3,6 @@ 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
 from werkzeug.exceptions import NotFound, BadRequest, Forbidden
@@ -16,7 +15,8 @@ from ..models.user import _PasswordReset
 from ..utils.hook import Hook
 from ..utils.datetime import from_iso_format
 from ..utils.foreign_keys import merge_references
-from ..controller import imageController, messageController, sessionController
+from ..controller import imageController, messageController, pluginController, sessionController
+from ..plugins import AuthPlugin
 
 
 def __active_users():
@@ -41,17 +41,33 @@ def _generate_password_reset(user):
     return reset
 
 
+def get_provider(userid: str):
+    return [p for p in pluginController.get_authentication_provider() if p.user_exists(userid)][0]
+
+
+@Hook
+def update_user(user: User, backend: AuthPlugin):
+    """Update user data from backend
+
+    This is seperate function to provide a hook"""
+    backend.update_user(user)
+    if not user.display_name:
+        user.display_name = "{} {}.".format(user.firstname, user.lastname[0])
+    db.session.commit()
+
+
 def login_user(username, password):
     logger.info("login user {{ {} }}".format(username))
-
-    user = find_user(username)
-    if not user:
-        logger.debug("User not found in Database.")
-        user = User(userid=username)
-        db.session.add(user)
-    if current_app.config["FG_AUTH_BACKEND"].login(user, password):
-        update_user(user)
-        return user
+    for provider in pluginController.get_authentication_provider():
+        uid = provider.login(username, password)
+        if isinstance(uid, str):
+            user = get_user(uid)
+            if not user:
+                logger.debug("User not found in Database.")
+                user = User(userid=uid)
+                db.session.add(user)
+            update_user(user, provider)
+            return user
     return None
 
 
@@ -84,14 +100,6 @@ def reset_password(token: str, password: str):
     db.session.commit()
 
 
-@Hook
-def update_user(user):
-    current_app.config["FG_AUTH_BACKEND"].update_user(user)
-    if not user.display_name:
-        user.display_name = "{} {}.".format(user.firstname, user.lastname[0])
-    db.session.commit()
-
-
 def set_roles(user: User, roles: list[str], create=False):
     """Set roles of user
 
@@ -115,7 +123,7 @@ def set_roles(user: User, roles: list[str], create=False):
     user.roles_ = fetched
 
 
-def modify_user(user, password, new_password=None):
+def modify_user(user: User, password: str, new_password: str = None):
     """Modify given user on the backend
 
     Args:
@@ -127,7 +135,8 @@ def modify_user(user, password, new_password=None):
         NotImplemented: If backend is not capable of this operation
         BadRequest: Password is wrong or other logic issues
     """
-    current_app.config["FG_AUTH_BACKEND"].modify_user(user, password, new_password)
+    provider = get_provider(user.userid)
+    provider.modify_user(user, password, new_password)
 
     if new_password:
         logger.debug(f"Password changed for user {user.userid}")
@@ -165,37 +174,13 @@ def get_user(uid, deleted=False) -> User:
     return user
 
 
-def find_user(uid_mail):
-    """Finding an user by userid or mail in database or auth-backend
-    Args:
-        uid_mail: userid and or mail to search for
-    Returns:
-        User if found or None
-    """
-    mail = uid_mail.split("@")
-    mail = len(mail) == 2 and len(mail[0]) > 0 and len(mail[1]) > 0
-
-    query = User.userid == uid_mail
-    if mail:
-        query |= User.mail == uid_mail
-    user = User.query.filter(query).one_or_none()
-    if user:
-        update_user(user)
-    else:
-        user = current_app.config["FG_AUTH_BACKEND"].find_user(uid_mail, uid_mail if mail else None)
-        if user:
-            if not user.display_name:
-                user.display_name = "{} {}.".format(user.firstname, user.lastname[0])
-            db.session.add(user)
-            db.session.commit()
-    return 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)
+    provider = get_provider(user.userid)
+    provider.delete_user(user)
+
     # Clear all easy relationships
     user.avatar_ = None
     user._attributes.clear()
@@ -247,10 +232,14 @@ def register(data, passwd=None):
     set_roles(user, roles)
 
     password = passwd if passwd else secrets.token_urlsafe(16)
-    current_app.config["FG_AUTH_BACKEND"].create_user(user, password)
     try:
+        provider = [p for p in pluginController.get_authentication_provider() if p.can_register()][0]
+        provider.create_user(user, password)
         db.session.add(user)
         db.session.commit()
+    except IndexError:
+        logger.error("No authentication backend, allowing registering new users, found.")
+        raise BadRequest
     except exc.IntegrityError:
         raise BadRequest("userid already in use")
 
@@ -265,7 +254,7 @@ def register(data, passwd=None):
         )
         messageController.send_message(messageController.Message(user, text, subject))
 
-    find_user(user.userid)
+    provider.update_user(user)
 
     return user
 
@@ -274,19 +263,20 @@ def load_avatar(user: User):
     if user.avatar_ is not None:
         return imageController.send_image(image=user.avatar_)
     else:
-        avatar = current_app.config["FG_AUTH_BACKEND"].get_avatar(user)
+        provider = get_provider(user.userid)
+        avatar = provider.get_avatar(user)
         if len(avatar.binary) > 0:
             return send_file(BytesIO(avatar.binary), avatar.mimetype)
     raise NotFound
 
 
 def save_avatar(user, file):
-    current_app.config["FG_AUTH_BACKEND"].set_avatar(user, file)
+    get_provider(user.userid).set_avatar(user, file)
     db.session.commit()
 
 
 def delete_avatar(user):
-    current_app.config["FG_AUTH_BACKEND"].delete_avatar(user)
+    get_provider(user.userid).delete_avatar(user)
     db.session.commit()
 
 
diff --git a/flaschengeist/database/types.py b/flaschengeist/database/types.py
index 369bb30..645ecdd 100644
--- a/flaschengeist/database/types.py
+++ b/flaschengeist/database/types.py
@@ -1,4 +1,4 @@
-import sys
+from importlib import import_module
 import datetime
 
 from sqlalchemy import BigInteger, util
@@ -12,12 +12,11 @@ class ModelSerializeMixin:
     """
 
     def __is_optional(self, param):
-        if sys.version_info < (3, 8):
-            return False
-
         import typing
 
-        hint = typing.get_type_hints(self.__class__)[param]
+        module = import_module("flaschengeist.models").__dict__
+
+        hint = typing.get_type_hints(self.__class__, globalns=module)[param]
         if (
             typing.get_origin(hint) is typing.Union
             and len(typing.get_args(hint)) == 2
diff --git a/flaschengeist/models/plugin.py b/flaschengeist/models/plugin.py
index eb5cf35..a912afd 100644
--- a/flaschengeist/models/plugin.py
+++ b/flaschengeist/models/plugin.py
@@ -1,26 +1,72 @@
 from __future__ import annotations  # TODO: Remove if python requirement is >= 3.12 (? PEP 563 is defered)
 
 from typing import Any
+from sqlalchemy.orm.collections import attribute_mapped_collection
 
 from ..database import db
 from ..database.types import Serial
 
 
-class Plugin(db.Model):
-    __tablename__ = "plugin"
-    id: int = db.Column("id", Serial, primary_key=True)
-    name: str = db.Column(db.String(127), nullable=False)
-    version: str = db.Column(db.String(30), nullable=False)
-    """The latest installed version"""
-    enabled: bool = db.Column(db.Boolean, default=False)
-
-    settings_ = db.relationship("PluginSetting", cascade="all, delete")
-    permissions_ = db.relationship("Permission", cascade="all, delete")
-
-
 class PluginSetting(db.Model):
     __tablename__ = "plugin_setting"
     id = db.Column("id", Serial, primary_key=True)
     plugin_id: int = db.Column("plugin", Serial, db.ForeignKey("plugin.id"))
     name: str = db.Column(db.String(127), nullable=False)
     value: Any = db.Column(db.PickleType(protocol=4))
+
+
+class BasePlugin(db.Model):
+    __tablename__ = "plugin"
+    id: int = db.Column("id", Serial, primary_key=True)
+    name: str = db.Column(db.String(127), nullable=False)
+    """Name of the plugin, loaded from distribution"""
+    installed_version: str = db.Column("version", db.String(30), nullable=False)
+    """The latest installed version"""
+    enabled: bool = db.Column(db.Boolean, default=False)
+    """Enabled state of the plugin"""
+    permissions: list = db.relationship(
+        "Permission", cascade="all, delete, delete-orphan", back_populates="plugin_", lazy="select"
+    )
+    """Optional list of custom permissions used by the plugin
+    
+    A good style is to name the permissions with a prefix related to the plugin name,
+    to prevent clashes with other plugins. E. g. instead of *delete* use *plugin_delete*.
+    """
+
+    __settings: dict[str, "PluginSetting"] = db.relationship(
+        "PluginSetting",
+        collection_class=attribute_mapped_collection("name"),
+        cascade="all, delete, delete-orphan",
+        lazy="select",
+    )
+
+    def get_setting(self, name: str, **kwargs):
+        """Get plugin setting
+
+        Args:
+            name: string identifying the setting
+            default: Default value
+        Returns:
+            Value stored in database (native python)
+        Raises:
+            `KeyError` if no such setting exists in the database
+        """
+        try:
+            return self.__settings[name].value
+        except KeyError as e:
+            if "default" in kwargs:
+                return kwargs["default"]
+            raise e
+
+    def set_setting(self, name: str, value):
+        """Save setting in database
+
+        Args:
+            name: String identifying the setting
+            value: Value to be stored
+        """
+        if value is None and name in self.__settings.keys():
+            del self.__settings[name]
+        else:
+            setting = self.__settings.setdefault(name, PluginSetting(plugin_id=self.id, name=name, value=None))
+            setting.value = value
diff --git a/flaschengeist/models/user.py b/flaschengeist/models/user.py
index 077b78c..e12db4a 100644
--- a/flaschengeist/models/user.py
+++ b/flaschengeist/models/user.py
@@ -24,8 +24,9 @@ class Permission(db.Model, ModelSerializeMixin):
     __tablename__ = "permission"
     name: str = db.Column(db.String(30), unique=True)
 
-    _id = db.Column("id", Serial, primary_key=True)
-    _plugin_id: int = db.Column("plugin", Serial, db.ForeignKey("plugin.id"))
+    id_ = db.Column("id", Serial, primary_key=True)
+    plugin_id_: int = db.Column("plugin", Serial, db.ForeignKey("plugin.id"))
+    plugin_ = db.relationship("Plugin", lazy="select", back_populates="permissions", enable_typechecks=False)
 
 
 class Role(db.Model, ModelSerializeMixin):
@@ -64,9 +65,7 @@ class User(db.Model, ModelSerializeMixin):
     # Protected stuff for backend use only
     id_ = db.Column("id", Serial, primary_key=True)
     roles_: list[Role] = db.relationship("Role", secondary=association_table, cascade="save-update, merge")
-    sessions_: list[Session] = db.relationship(
-        "Session", back_populates="user_", cascade="all, delete, delete-orphan"
-    )
+    sessions_: list[Session] = db.relationship("Session", back_populates="user_", cascade="all, delete, delete-orphan")
     avatar_: Optional[Image] = db.relationship("Image", cascade="all, delete, delete-orphan", single_parent=True)
     reset_requests_: list["_PasswordReset"] = db.relationship("_PasswordReset", cascade="all, delete, delete-orphan")
 
diff --git a/flaschengeist/plugins/__init__.py b/flaschengeist/plugins/__init__.py
index f1a68a0..ff53f86 100644
--- a/flaschengeist/plugins/__init__.py
+++ b/flaschengeist/plugins/__init__.py
@@ -4,13 +4,13 @@
 
 """
 
-from typing import Optional
-from importlib.metadata import Distribution, EntryPoint
-from werkzeug.exceptions import MethodNotAllowed, NotFound
+from typing import Union
+from importlib.metadata import entry_points
+from werkzeug.exceptions import NotFound
 from werkzeug.datastructures import FileStorage
 
-from flaschengeist.models import User
-from flaschengeist.models.user import _Avatar
+from flaschengeist.models.plugin import BasePlugin
+from flaschengeist.models.user import _Avatar, Permission
 from flaschengeist.utils.hook import HookBefore, HookAfter
 
 __all__ = [
@@ -20,7 +20,7 @@ __all__ = [
     "before_role_updated",
     "before_update_user",
     "after_role_updated",
-    "BasePlugin",
+    "Plugin",
     "AuthPlugin",
 ]
 
@@ -71,7 +71,7 @@ Passed args:
 """
 
 
-class BasePlugin:
+class Plugin(BasePlugin):
     """Base class for all Plugins
 
     All plugins must derived from this class.
@@ -82,47 +82,30 @@ class BasePlugin:
         - *models*: Your models, used for API export
     """
 
-    name: str
-    """Name of the plugin, loaded from EntryPoint"""
-
-    version: str
-    """Version of the plugin, loaded from Distribution"""
-
-    dist: Distribution
-    """Distribution of this plugin"""
-
     blueprint = None
     """Optional `flask.blueprint` if the plugin uses custom routes"""
 
-    permissions: list[str] = []
-    """Optional list of custom permissions used by the plugin
-    
-    A good style is to name the permissions with a prefix related to the plugin name,
-    to prevent clashes with other plugins. E. g. instead of *delete* use *plugin_delete*.
-    """
-
     models = None
     """Optional module containing the SQLAlchemy models used by the plugin"""
 
-    migrations: Optional[tuple[str, str]] = None
-    """Optional identifiers of the migration versions
-    
-    If custom database tables are used migrations must be provided and the
-    head and removal versions had to be defined, e.g.
-    
-    ```
-    migrations = ("head_hash", "removal_hash")
-    ```
-    """
+    @property
+    def version(self) -> str:
+        """Version of the plugin, loaded from Distribution"""
+        return self.dist.version
 
-    def __init__(self, entry_point: EntryPoint):
-        """Constructor called by create_app
-        Args:
-            entry_point: EntryPoint from which this plugin was loaded
-        """
-        self.version = entry_point.dist.version
-        self.name = entry_point.name
-        self.dist = entry_point.dist
+    @property
+    def dist(self):
+        """Distribution of this plugin"""
+        return self.entry_point.dist
+
+    @property
+    def entry_point(self):
+        ep = entry_points(group="flaschengeist.plugins", name=self.name)
+        return ep[0]
+
+    def load(self):
+        """__init__ like function that is called when the plugin is initially loaded"""
+        pass
 
     def install(self):
         """Installation routine
@@ -145,40 +128,6 @@ class BasePlugin:
         """
         pass
 
-    @property
-    def installed_version(self):
-        """Installed version of the plugin"""
-        from ..controller import pluginController
-
-        self.__installed_version = pluginController.get_installed_version(self.name)
-        return self.__installed_version
-
-    def get_setting(self, name: str, **kwargs):
-        """Get plugin setting from database
-
-        Args:
-            name: string identifying the setting
-            default: Default value
-        Returns:
-            Value stored in database (native python)
-        Raises:
-            `KeyError` if no such setting exists in the database
-        """
-        from ..controller import pluginController
-
-        return pluginController.get_setting(self.name, name, **kwargs)
-
-    def set_setting(self, name: str, value):
-        """Save setting in database
-
-        Args:
-            name: String identifying the setting
-            value: Value to be stored
-        """
-        from ..controller import pluginController
-
-        return pluginController.set_setting(self.name, name, value)
-
     def notify(self, user, text: str, data=None):
         """Create a new notification for an user
 
@@ -203,40 +152,53 @@ class BasePlugin:
         """
         return {"version": self.version, "permissions": self.permissions}
 
+    def install_permissions(self, permissions: list[str]):
+        """Helper for installing a list of strings as permissions
 
-class AuthPlugin(BasePlugin):
+        Args:
+            permissions: List of permissions to install
+        """
+        cur_perm = set(x.name for x in self.permissions)
+        all_perm = set(permissions)
+
+        new_perms = all_perm - cur_perm
+        self.permissions = list(filter(lambda x: x.name in permissions, self.permissions)) + [
+            Permission(name=x, plugin_=self) for x in new_perms
+        ]
+
+
+class AuthPlugin(Plugin):
     """Base class for all authentification plugins
 
-    See also `BasePlugin`
+    See also `Plugin`
     """
 
-    def login(self, user, pw):
+    def login(self, login_name, password) -> Union[bool, str]:
         """Login routine, MUST BE IMPLEMENTED!
 
         Args:
-            user: User class containing at least the uid
-            pw: given password
+            login_name: The name the user entered
+            password: The password the user used to log in
         Returns:
-            Must return False if not found or invalid credentials, True if success
+            Must return False if not found or invalid credentials, otherwise the UID is returned
         """
         raise NotImplemented
 
-    def update_user(self, user):
+    def update_user(self, user: "User"):
         """If backend is using external data, then update this user instance with external data
         Args:
             user: User object
         """
         pass
 
-    def find_user(self, userid, mail=None):
-        """Find an user by userid or mail
+    def user_exists(self, userid) -> bool:
+        """Check if user exists on this backend
         Args:
             userid: Userid to search
-            mail: If set, mail to search
         Returns:
-            None or User
+            True or False
         """
-        return None
+        raise NotImplemented
 
     def modify_user(self, user, password, new_password=None):
         """If backend is using (writeable) external data, then update the external database with the user provided.
@@ -247,11 +209,14 @@ class AuthPlugin(BasePlugin):
             password: Password (some backends need the current password for changes) if None force edit (admin)
             new_password: If set a password change is requested
         Raises:
-            NotImplemented: If backend does not support this feature (or no password change)
             BadRequest: Logic error, e.g. password is wrong.
             Error: Other errors if backend went mad (are not handled and will result in a 500 error)
         """
-        raise NotImplemented
+        pass
+
+    def can_register(self):
+        """Check if this backend allows to register new users"""
+        return False
 
     def create_user(self, user, password):
         """If backend is using (writeable) external data, then create a new user on the external database.
@@ -272,7 +237,7 @@ class AuthPlugin(BasePlugin):
         """
         raise MethodNotAllowed
 
-    def get_avatar(self, user):
+    def get_avatar(self, user) -> _Avatar:
         """Retrieve avatar for given user (if supported by auth backend)
 
         Default behavior is to use native Image objects,
diff --git a/flaschengeist/plugins/auth/__init__.py b/flaschengeist/plugins/auth/__init__.py
index be20ac2..7f06302 100644
--- a/flaschengeist/plugins/auth/__init__.py
+++ b/flaschengeist/plugins/auth/__init__.py
@@ -6,13 +6,13 @@ from flask import Blueprint, request, jsonify
 from werkzeug.exceptions import Forbidden, BadRequest, Unauthorized
 
 from flaschengeist import logger
-from flaschengeist.plugins import BasePlugin
+from flaschengeist.plugins import Plugin
 from flaschengeist.utils.HTTP import no_content, created
 from flaschengeist.utils.decorators import login_required
 from flaschengeist.controller import sessionController, userController
 
 
-class AuthRoutePlugin(BasePlugin):
+class AuthRoutePlugin(Plugin):
     blueprint = Blueprint("auth", __name__)
 
 
diff --git a/flaschengeist/plugins/auth_plain/__init__.py b/flaschengeist/plugins/auth_plain/__init__.py
index 50ab4af..bdf01ac 100644
--- a/flaschengeist/plugins/auth_plain/__init__.py
+++ b/flaschengeist/plugins/auth_plain/__init__.py
@@ -7,42 +7,25 @@ import os
 import hashlib
 import binascii
 from werkzeug.exceptions import BadRequest
-from flaschengeist.plugins import AuthPlugin, plugins_installed
+from flaschengeist.plugins import AuthPlugin
 from flaschengeist.models import User, Role, Permission
 from flaschengeist.database import db
 from flaschengeist import logger
 
 
 class AuthPlain(AuthPlugin):
-    def install(self):
-        plugins_installed(self.post_install)
+    def can_register(self):
+        return True
 
-    def post_install(self, *args, **kwargs):
-        if User.query.filter(User.deleted == False).count() == 0:
-            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",
-                firstname="Admin",
-                lastname="Admin",
-                mail="",
-                roles_=[role],
-            )
-            self.modify_user(admin, None, "admin")
-            db.session.add(admin)
-            db.session.commit()
-            logger.warning(
-                "New administrator user was added, please change the password or remove it before going into"
-                "production mode. Initial credentials:\n"
-                "name: admin\n"
-                "password: admin"
-            )
-
-    def login(self, user: User, password: str):
-        if user.has_attribute("password"):
-            return AuthPlain._verify_password(user.get_attribute("password"), password)
+    def login(self, login_name, password):
+        users: list[User] = (
+            User.query.filter((User.userid == login_name) | (User.mail == login_name))
+            .filter(User._attributes.any(name="password"))
+            .all()
+        )
+        for user in users:
+            if AuthPlain._verify_password(user.get_attribute("password"), password):
+                return user.userid
         return False
 
     def modify_user(self, user, password, new_password=None):
@@ -51,6 +34,12 @@ class AuthPlain(AuthPlugin):
         if new_password:
             user.set_attribute("password", AuthPlain._hash_password(new_password))
 
+    def user_exists(self, userid) -> bool:
+        return (
+            db.session.query(User.id_).filter(User.userid == userid, User._attributes.any(name="password")).first()
+            is not None
+        )
+
     def create_user(self, user, password):
         if not user.userid:
             raise BadRequest("userid is missing for new user")
@@ -68,7 +57,7 @@ class AuthPlain(AuthPlugin):
         return (salt + pass_hash).decode("ascii")
 
     @staticmethod
-    def _verify_password(stored_password, provided_password):
+    def _verify_password(stored_password: str, provided_password: str):
         salt = stored_password[:64]
         stored_password = stored_password[64:]
         pass_hash = hashlib.pbkdf2_hmac("sha3-512", provided_password.encode("utf-8"), salt.encode("ascii"), 100000)
diff --git a/flaschengeist/plugins/message_mail.py b/flaschengeist/plugins/message_mail.py
index 59d82d1..acc00de 100644
--- a/flaschengeist/plugins/message_mail.py
+++ b/flaschengeist/plugins/message_mail.py
@@ -4,13 +4,13 @@ from email.mime.multipart import MIMEMultipart
 
 from flaschengeist import logger
 from flaschengeist.models import User
-from flaschengeist.plugins import BasePlugin
+from flaschengeist.plugins import Plugin
 from flaschengeist.utils.hook import HookAfter
 from flaschengeist.controller import userController
 from flaschengeist.controller.messageController import Message
 
 
-class MailMessagePlugin(BasePlugin):
+class MailMessagePlugin(Plugin):
     def __init__(self, entry_point, config):
         super().__init__(entry_point, config)
         self.server = config["SERVER"]
diff --git a/flaschengeist/plugins/roles/__init__.py b/flaschengeist/plugins/roles/__init__.py
index cd2fae4..07380cb 100644
--- a/flaschengeist/plugins/roles/__init__.py
+++ b/flaschengeist/plugins/roles/__init__.py
@@ -6,7 +6,7 @@ Provides routes used to configure roles and permissions of users / roles.
 from werkzeug.exceptions import BadRequest
 from flask import Blueprint, request, jsonify
 
-from flaschengeist.plugins import BasePlugin
+from flaschengeist.plugins import Plugin
 from flaschengeist.controller import roleController
 from flaschengeist.utils.HTTP import created, no_content
 from flaschengeist.utils.decorators import login_required
@@ -14,9 +14,11 @@ from flaschengeist.utils.decorators import login_required
 from . import permissions
 
 
-class RolesPlugin(BasePlugin):
+class RolesPlugin(Plugin):
     blueprint = Blueprint("roles", __name__)
-    permissions = permissions.permissions
+
+    def install(self):
+        self.install_permissions(permissions.permissions)
 
 
 @RolesPlugin.blueprint.route("/roles", methods=["GET"])
diff --git a/flaschengeist/plugins/scheduler.py b/flaschengeist/plugins/scheduler.py
index 43a0a8b..268bafd 100644
--- a/flaschengeist/plugins/scheduler.py
+++ b/flaschengeist/plugins/scheduler.py
@@ -3,7 +3,7 @@ from datetime import datetime, timedelta
 
 from flaschengeist import logger
 from flaschengeist.config import config
-from flaschengeist.plugins import BasePlugin
+from flaschengeist.plugins import Plugin
 from flaschengeist.utils.HTTP import no_content
 
 
@@ -38,11 +38,10 @@ def scheduled(id: str, replace=False, **kwargs):
     return real_decorator
 
 
-class SchedulerPlugin(BasePlugin):
-    def __init__(self, entry_point):
-        super().__init__(entry_point)
-        self.blueprint = Blueprint(self.name, __name__)
+class SchedulerPlugin(Plugin):
+    blueprint = Blueprint("scheduler", __name__)
 
+    def load(self):
         def __view_func():
             self.run_tasks()
             return no_content()
diff --git a/flaschengeist/plugins/users/__init__.py b/flaschengeist/plugins/users/__init__.py
index 7511a3f..e819486 100644
--- a/flaschengeist/plugins/users/__init__.py
+++ b/flaschengeist/plugins/users/__init__.py
@@ -9,7 +9,7 @@ from werkzeug.exceptions import BadRequest, Forbidden, MethodNotAllowed
 from . import permissions
 from flaschengeist import logger
 from flaschengeist.config import config
-from flaschengeist.plugins import BasePlugin
+from flaschengeist.plugins import Plugin
 from flaschengeist.models import User
 from flaschengeist.utils.decorators import login_required, extract_session, headers
 from flaschengeist.controller import userController
@@ -17,9 +17,11 @@ from flaschengeist.utils.HTTP import created, no_content
 from flaschengeist.utils.datetime import from_iso_format
 
 
-class UsersPlugin(BasePlugin):
+class UsersPlugin(Plugin):
     blueprint = Blueprint("users", __name__)
-    permissions = permissions.permissions
+
+    def install(self):
+        self.install_permissions(permissions.permissions)
 
 
 @UsersPlugin.blueprint.route("/users", methods=["POST"])