feat(plugins): Identify plugins by id, migrations must be provided at defined location, add utils for plugin functions

flaschengeist/app.py

@@ -1,6 +1,6 @@
 import enum
 
-from flask import Flask, current_app
+from flask import Flask
 from flask_cors import CORS
 from datetime import datetime, date
 from flask.json import JSONEncoder, jsonify
@@ -11,7 +11,6 @@ from werkzeug.exceptions import HTTPException
 from flaschengeist import logger
 from flaschengeist.utils.hook import Hook
 from flaschengeist.plugins import AuthPlugin
-from flaschengeist.controller import roleController
 from flaschengeist.config import config, configure_app
 
 
@@ -37,10 +36,9 @@ class CustomJSONEncoder(JSONEncoder):
 
 
 @Hook("plugins.loaded")
-def __load_plugins(app):
-    logger.debug("Search for plugins")
-
+def load_plugins(app: Flask):
     app.config["FG_PLUGINS"] = {}
+
     for entry_point in entry_points(group="flaschengeist.plugins"):
         logger.debug(f"Found plugin: {entry_point.name} ({entry_point.dist.version})")
 
@@ -72,27 +70,11 @@ def __load_plugins(app):
         else:
             logger.debug(f"Skip disabled plugin {entry_point.name}")
     if "FG_AUTH_BACKEND" not in app.config:
-        logger.error("No authentication plugin configured or authentication plugin not found")
+        logger.fatal("No authentication plugin configured or authentication plugin not found")
         raise RuntimeError("No authentication plugin configured or authentication plugin not found")
 
 
-@Hook("plugins.installed")
-def install_all():
-    from flaschengeist.database import db
-
-    db.create_all()
-    db.session.commit()
-    for name, plugin in current_app.config["FG_PLUGINS"].items():
-        if not plugin:
-            logger.debug(f"Skip disabled plugin: {name}")
-            continue
-        logger.info(f"Install plugin {name}")
-        plugin.install()
-        if plugin.permissions:
-            roleController.create_permissions(plugin.permissions)
-
-
-def create_app(test_config=None):
+def create_app(test_config=None, cli=False):
     app = Flask("flaschengeist")
     app.json_encoder = CustomJSONEncoder
     CORS(app)
@@ -103,7 +85,7 @@ def create_app(test_config=None):
         configure_app(app, test_config)
         db.init_app(app)
         migrate.init_app(app, db, compare_type=True)
-        __load_plugins(app)
+        load_plugins(app)
 
     @app.route("/", methods=["GET"])
     def __get_state():

flaschengeist/database.py

@@ -24,9 +24,16 @@ migrate = Migrate()
 def configure_alembic(config):
     """Alembic configuration hook
 
+    Inject all migrations paths into the ``version_locations`` config option.
+    This includes even disabled plugins, as simply disabling a plugin without
+    uninstall can break the alembic version management.
     """
+    import inspect, pathlib
+    from flaschengeist.utils.plugin import get_plugins
+
     # Load migration paths from plugins
-    migrations = [str(p.migrations_path) for p in current_app.config["FG_PLUGINS"].values() if p and p.migrations_path]
+    migrations = [(pathlib.Path(inspect.getfile(p)).parent / "migrations") for p in get_plugins()]
+    migrations = [str(m.resolve()) for m in migrations if m.exists()]
     if len(migrations) > 0:
         # Get configured paths
         paths = config.get_main_option("version_locations")

flaschengeist/plugins/__init__.py

@@ -5,8 +5,8 @@
 """
 
 from importlib_metadata import Distribution, EntryPoint
-from werkzeug.datastructures import FileStorage
 from werkzeug.exceptions import MethodNotAllowed, NotFound
+from werkzeug.datastructures import FileStorage
 
 from flaschengeist.models.user import _Avatar, User
 from flaschengeist.utils.hook import HookBefore, HookAfter
@@ -121,6 +121,17 @@ class Plugin:
         """
         pass
 
+    def uninstall(self):
+        """Uninstall routine
+
+        If the plugin has custom database tables, make sure to remove them.
+        This can be either done by downgrading the plugin *head* to the *base*.
+        Or use custom migrations for the uninstall and *stamp* some version.
+
+        Is always called with Flask application context.
+        """
+        pass
+
     def get_setting(self, name: str, **kwargs):
         """Get plugin setting from database
 
@@ -173,6 +184,11 @@ class Plugin:
 
 
 class AuthPlugin(Plugin):
+    """Base class for all authentification plugins
+
+    See also `Plugin`
+    """
+
     def login(self, user, pw):
         """Login routine, MUST BE IMPLEMENTED!
 
@@ -235,7 +251,7 @@ class AuthPlugin(Plugin):
         """
         raise MethodNotAllowed
 
-    def get_avatar(self, user: User) -> _Avatar:
+    def get_avatar(self, user):
         """Retrieve avatar for given user (if supported by auth backend)
 
         Default behavior is to use native Image objects,
@@ -267,7 +283,7 @@ class AuthPlugin(Plugin):
 
         user.avatar_ = imageController.upload_image(file)
 
-    def delete_avatar(self, user: User):
+    def delete_avatar(self, user):
         """Delete the avatar for given user (if supported by auth backend)
 
         Default behavior is to use the imageController and native Image objects.

flaschengeist/plugins/auth/__init__.py

@@ -13,8 +13,8 @@ from flaschengeist.controller import sessionController, userController
 
 
 class AuthRoutePlugin(Plugin):
-    name = "auth"
-    blueprint = Blueprint(name, __name__)
+    id = "dev.flaschengeist.auth"
+    blueprint = Blueprint("auth", __name__)
 
 
 @AuthRoutePlugin.blueprint.route("/auth", methods=["POST"])

flaschengeist/plugins/auth_ldap/__init__.py

@@ -18,7 +18,7 @@ from flaschengeist.plugins import AuthPlugin, before_role_updated
 
 class AuthLDAP(AuthPlugin):
     def __init__(self, entry_point, config):
-        super().__init__(entry_point)
+        super().__init__(entry_point, config)
         app.config.update(
             LDAP_SERVER=config.get("host", "localhost"),
             LDAP_PORT=config.get("port", 389),

flaschengeist/plugins/auth_plain/__init__.py

@@ -14,6 +14,8 @@ from flaschengeist import logger
 
 
 class AuthPlain(AuthPlugin):
+    id = "auth_plain"
+
     def install(self):
         plugins_installed(self.post_install)
 

flaschengeist/plugins/message_mail.py

@@ -13,7 +13,7 @@ from . import Plugin
 
 class MailMessagePlugin(Plugin):
     def __init__(self, entry_point, config):
-        super().__init__(entry_point)
+        super().__init__(entry_point, config)
         self.server = config["SERVER"]
         self.port = config["PORT"]
         self.user = config["USER"]

flaschengeist/utils/plugin.py

@@ -0,0 +1,46 @@
+"""Plugin utils
+
+Utilities for handling Flaschengeist plugins
+"""
+
+import pkg_resources
+from flaschengeist import logger
+from flaschengeist.plugins import Plugin
+
+
+def get_plugins() -> list[type[Plugin]]:
+    """Get all installed plugins for Flaschengeist
+
+    Returns:
+        list of classes implementing `flaschengeist.plugins.Plugin`
+    """
+    logger.debug("Search for plugins")
+
+    plugins = []
+    for entry_point in pkg_resources.iter_entry_points("flaschengeist.plugins"):
+        try:
+            logger.debug(f"Found plugin: >{entry_point.name}<")
+            plugin_class = entry_point.load()
+            if issubclass(plugin_class, Plugin):
+                plugins.append(plugin_class)
+        except TypeError:
+            logger.error(f"Invalid entry point for plugin {entry_point.name} found.")
+    return plugins
+
+
+def plugin_version(plugin: type[Plugin]) -> str:
+    """Get version of plugin
+
+    Returns the version of a plugin, if plugin does not set the
+    version property, the version of the package providing the
+    plugin is taken.
+
+    Args:
+        plugin: Plugin or Plugin class
+
+    Returns:
+        Version as string
+    """
+    if plugin.version:
+        return plugin.version
+    return pkg_resources.get_distribution(plugin.__module__.split(".", 1)[0]).version