678 lines
27 KiB
Python
678 lines
27 KiB
Python
# -*- coding: utf-8 -*-
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## This file is part of Gajim.
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##
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## Gajim is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published
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## by the Free Software Foundation; version 3 only.
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##
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## Gajim is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
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##
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'''
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Plug-in management related classes.
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:author: Mateusz Biliński <mateusz@bilinski.it>
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:since: 30th May 2008
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:copyright: Copyright (2008) Mateusz Biliński <mateusz@bilinski.it>
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:license: GPL
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'''
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__all__ = ['PluginManager']
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import os
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import sys
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import fnmatch
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import zipfile
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from shutil import rmtree
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import configparser
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from pkg_resources import parse_version
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from gajim.common import app
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from gajim.common import nec
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from gajim.common.exceptions import PluginsystemError
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from gajim.plugins.helpers import log, log_calls, Singleton
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from gajim.plugins.helpers import GajimPluginActivateException
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from gajim.plugins.gajimplugin import GajimPlugin, GajimPluginException
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class PluginManager(metaclass=Singleton):
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'''
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Main plug-in management class.
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Currently:
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- scans for plugins
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- activates them
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- handles GUI extension points, when called by GUI objects after
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plugin is activated (by dispatching info about call to handlers
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in plugins)
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:todo: add more info about how GUI extension points work
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:todo: add list of available GUI extension points
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:todo: implement mechanism to dynamically load plugins where GUI extension
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points have been already called (i.e. when plugin is activated
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after GUI object creation). [DONE?]
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:todo: implement mechanism to dynamically deactive plugins (call plugin's
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deactivation handler) [DONE?]
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:todo: when plug-in is deactivated all GUI extension points are removed
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from `PluginManager.gui_extension_points_handlers`. But when
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object that invoked GUI extension point is abandoned by Gajim,
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eg. closed ChatControl object, the reference to called GUI
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extension points is still in `PluginManager.gui_extension_points`
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These should be removed, so that object can be destroyed by
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Python.
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Possible solution: add call to clean up method in classes
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'destructors' (classes that register GUI extension points)
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'''
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__metaclass__ = Singleton
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#@log_calls('PluginManager')
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def __init__(self):
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self.plugins = []
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'''
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Detected plugin classes.
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Each class object in list is `GajimPlugin` subclass.
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:type: [] of class objects
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'''
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self.active_plugins = []
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'''
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Instance objects of active plugins.
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These are object instances of classes held `plugins`, but only those
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that were activated.
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:type: [] of `GajimPlugin` based objects
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'''
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self.gui_extension_points = {}
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'''
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Registered GUI extension points.
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'''
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self.gui_extension_points_handlers = {}
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'''
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Registered handlers of GUI extension points.
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'''
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self.encryption_plugins = {}
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'''
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Registered names with instances of encryption Plugins.
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'''
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for path in [app.PLUGINS_DIRS[1], app.PLUGINS_DIRS[0]]:
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pc = PluginManager.scan_dir_for_plugins(path)
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self.add_plugins(pc)
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self._activate_all_plugins_from_global_config()
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@log_calls('PluginManager')
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def _plugin_has_entry_in_global_config(self, plugin):
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if app.config.get_per('plugins', plugin.short_name) is None:
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return False
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else:
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return True
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@log_calls('PluginManager')
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def _create_plugin_entry_in_global_config(self, plugin):
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app.config.add_per('plugins', plugin.short_name)
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def _remove_plugin_entry_in_global_config(self, plugin):
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app.config.del_per('plugins', plugin.short_name)
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@log_calls('PluginManager')
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def add_plugin(self, plugin_class):
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'''
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:todo: what about adding plug-ins that are already added? Module reload
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and adding class from reloaded module or ignoring adding plug-in?
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'''
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plugin = plugin_class()
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if plugin not in self.plugins:
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if not self._plugin_has_entry_in_global_config(plugin):
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self._create_plugin_entry_in_global_config(plugin)
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self.plugins.append(plugin)
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plugin.active = False
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else:
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log.info('Not loading plugin %s v%s from module %s (identified by'
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' short name: %s). Plugin already loaded.' % (plugin.name,
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plugin.version, plugin.__module__, plugin.short_name))
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@log_calls('PluginManager')
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def add_plugins(self, plugin_classes):
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for plugin_class in plugin_classes:
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self.add_plugin(plugin_class)
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@log_calls('PluginManager')
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def get_active_plugin(self, plugin_name):
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for plugin in self.active_plugins:
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if plugin.short_name == plugin_name:
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return plugin
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return None
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@log_calls('PluginManager')
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def extension_point(self, gui_extpoint_name, *args):
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'''
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Invokes all handlers (from plugins) for a particular extension point, but
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doesnt add it to collection for further processing.
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For example if you pass a message for encryption via extension point to a
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plugin, its undesired that the call is stored and replayed on activating the
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plugin. For example after an update.
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:param gui_extpoint_name: name of GUI extension point.
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:type gui_extpoint_name: str
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:param args: parameters to be passed to extension point handlers
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(typically and object that invokes `gui_extension_point`;
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however, this can be practically anything)
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:type args: tuple
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'''
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self._execute_all_handlers_of_gui_extension_point(gui_extpoint_name,
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*args)
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@log_calls('PluginManager')
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def gui_extension_point(self, gui_extpoint_name, *args):
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'''
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Invokes all handlers (from plugins) for particular GUI extension point
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and adds it to collection for further processing (eg. by plugins not
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active yet).
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:param gui_extpoint_name: name of GUI extension point.
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:type gui_extpoint_name: str
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:param args: parameters to be passed to extension point handlers
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(typically and object that invokes `gui_extension_point`;
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however, this can be practically anything)
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:type args: tuple
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:todo: GUI extension points must be documented well - names with
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parameters that will be passed to handlers (in plugins). Such
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documentation must be obeyed both in core and in plugins. This
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is a loosely coupled approach and is pretty natural in Python.
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:bug: what if only some handlers are successfully connected? we should
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revert all those connections that where successfully made. Maybe
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call 'self._deactivate_plugin()' or sth similar.
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Looking closer - we only rewrite tuples here. Real check should
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be made in method that invokes gui_extpoints handlers.
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'''
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self._add_gui_extension_point_call_to_list(gui_extpoint_name, *args)
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self._execute_all_handlers_of_gui_extension_point(gui_extpoint_name,
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*args)
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@log_calls('PluginManager')
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def remove_gui_extension_point(self, gui_extpoint_name, *args):
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'''
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Removes GUI extension point from collection held by `PluginManager`.
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From this point this particular extension point won't be visible
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to plugins (eg. it won't invoke any handlers when plugin is activated).
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GUI extension point is removed completely (there is no way to recover it
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from inside `PluginManager`).
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Removal is needed when instance object that given extension point was
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connect with is destroyed (eg. ChatControl is closed or context menu
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is hidden).
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Each `PluginManager.gui_extension_point` call should have a call of
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`PluginManager.remove_gui_extension_point` related to it.
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:note: in current implementation different arguments mean different
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extension points. The same arguments and the same name mean
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the same extension point.
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:todo: instead of using argument to identify which extpoint should be
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removed, maybe add additional 'id' argument - this would work
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similar hash in Python objects. 'id' would be calculated based
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on arguments passed or on anything else (even could be constant)
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This would give core developers (that add new extpoints) more
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freedom, but is this necessary?
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:param gui_extpoint_name: name of GUI extension point.
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:type gui_extpoint_name: str
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:param args: arguments that `PluginManager.gui_extension_point` was
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called with for this extension point. This is used (along with
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extension point name) to identify element to be removed.
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:type args: tuple
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'''
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if gui_extpoint_name in self.gui_extension_points:
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extension_points = list(self.gui_extension_points[gui_extpoint_name])
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for ext_point in extension_points:
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if args[0] in ext_point:
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self.gui_extension_points[gui_extpoint_name].remove(
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ext_point)
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@log_calls('PluginManager')
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def _add_gui_extension_point_call_to_list(self, gui_extpoint_name, *args):
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'''
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Adds GUI extension point call to list of calls.
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This is done only if such call hasn't been added already
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(same extension point name and same arguments).
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:note: This is assumption that GUI extension points are different only
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if they have different name or different arguments.
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:param gui_extpoint_name: GUI extension point name used to identify it
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by plugins.
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:type gui_extpoint_name: str
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:param args: parameters to be passed to extension point handlers
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(typically and object that invokes `gui_extension_point`;
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however, this can be practically anything)
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:type args: tuple
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'''
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if ((gui_extpoint_name not in self.gui_extension_points)
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or (args not in self.gui_extension_points[gui_extpoint_name])):
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self.gui_extension_points.setdefault(gui_extpoint_name,[]).append(
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args)
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@log_calls('PluginManager')
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def _execute_all_handlers_of_gui_extension_point(self, gui_extpoint_name,
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*args):
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if gui_extpoint_name in self.gui_extension_points_handlers:
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for handlers in self.gui_extension_points_handlers[
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gui_extpoint_name]:
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try:
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handlers[0](*args)
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except Exception as e:
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log.warning('Error executing %s', handlers[0],
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exc_info=True)
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def _register_events_handlers_in_ged(self, plugin):
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for event_name, handler in plugin.events_handlers.items():
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priority = handler[0]
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handler_function = handler[1]
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app.ged.register_event_handler(event_name, priority,
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handler_function)
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def _remove_events_handler_from_ged(self, plugin):
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for event_name, handler in plugin.events_handlers.items():
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priority = handler[0]
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handler_function = handler[1]
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app.ged.remove_event_handler(event_name, priority,
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handler_function)
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def _register_network_events_in_nec(self, plugin):
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for event_class in plugin.events:
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setattr(event_class, 'plugin', plugin)
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if issubclass(event_class, nec.NetworkIncomingEvent):
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app.nec.register_incoming_event(event_class)
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elif issubclass(event_class, nec.NetworkOutgoingEvent):
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app.nec.register_outgoing_event(event_class)
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def _remove_network_events_from_nec(self, plugin):
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for event_class in plugin.events:
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if issubclass(event_class, nec.NetworkIncomingEvent):
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app.nec.unregister_incoming_event(event_class)
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elif issubclass(event_class, nec.NetworkOutgoingEvent):
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app.nec.unregister_outgoing_event(event_class)
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def _remove_name_from_encryption_plugins(self, plugin):
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if plugin.encryption_name:
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del self.encryption_plugins[plugin.encryption_name]
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@log_calls('PluginManager')
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def activate_plugin(self, plugin):
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'''
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:param plugin: plugin to be activated
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:type plugin: class object of `GajimPlugin` subclass
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'''
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if not plugin.active and plugin.activatable:
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self._add_gui_extension_points_handlers_from_plugin(plugin)
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self._add_encryption_name_from_plugin(plugin)
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self._handle_all_gui_extension_points_with_plugin(plugin)
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self._register_events_handlers_in_ged(plugin)
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self._register_network_events_in_nec(plugin)
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self.active_plugins.append(plugin)
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try:
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plugin.activate()
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except GajimPluginException as e:
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self.deactivate_plugin(plugin)
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raise GajimPluginActivateException(str(e))
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self._set_plugin_active_in_global_config(plugin)
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plugin.active = True
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def deactivate_plugin(self, plugin):
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# remove GUI extension points handlers (provided by plug-in) from
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# handlers list
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for gui_extpoint_name, gui_extpoint_handlers in \
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plugin.gui_extension_points.items():
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self.gui_extension_points_handlers[gui_extpoint_name].remove(
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gui_extpoint_handlers)
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# detaching plug-in from handler GUI extension points (calling
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# cleaning up method that must be provided by plug-in developer
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# for each handled GUI extension point)
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for gui_extpoint_name, gui_extpoint_handlers in \
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plugin.gui_extension_points.items():
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if gui_extpoint_name in self.gui_extension_points:
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for gui_extension_point_args in self.gui_extension_points[
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gui_extpoint_name]:
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handler = gui_extpoint_handlers[1]
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if handler:
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try:
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handler(*gui_extension_point_args)
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except Exception as e:
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log.warning('Error executing %s', handler,
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exc_info=True)
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self._remove_events_handler_from_ged(plugin)
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self._remove_network_events_from_nec(plugin)
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self._remove_name_from_encryption_plugins(plugin)
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# removing plug-in from active plug-ins list
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plugin.deactivate()
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self.active_plugins.remove(plugin)
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self._set_plugin_active_in_global_config(plugin, False)
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plugin.active = False
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def _deactivate_all_plugins(self):
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for plugin_object in self.active_plugins:
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self.deactivate_plugin(plugin_object)
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@log_calls('PluginManager')
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def _add_gui_extension_points_handlers_from_plugin(self, plugin):
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for gui_extpoint_name, gui_extpoint_handlers in \
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plugin.gui_extension_points.items():
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self.gui_extension_points_handlers.setdefault(gui_extpoint_name,
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[]).append(gui_extpoint_handlers)
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def _add_encryption_name_from_plugin(self, plugin):
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if plugin.encryption_name:
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self.encryption_plugins[plugin.encryption_name] = plugin
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@log_calls('PluginManager')
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def _handle_all_gui_extension_points_with_plugin(self, plugin):
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for gui_extpoint_name, gui_extpoint_handlers in \
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plugin.gui_extension_points.items():
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if gui_extpoint_name in self.gui_extension_points:
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for gui_extension_point_args in self.gui_extension_points[
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gui_extpoint_name]:
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handler = gui_extpoint_handlers[0]
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if handler:
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try:
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handler(*gui_extension_point_args)
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except Exception as e:
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log.warning('Error executing %s', handler,
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exc_info=True)
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@log_calls('PluginManager')
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def _activate_all_plugins(self):
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'''
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Activates all plugins in `plugins`.
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Activated plugins are appended to `active_plugins` list.
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'''
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for plugin in self.plugins:
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try:
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self.activate_plugin(plugin)
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except GajimPluginActivateException:
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pass
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def _activate_all_plugins_from_global_config(self):
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for plugin in self.plugins:
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if self._plugin_is_active_in_global_config(plugin) and \
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plugin.activatable:
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try:
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self.activate_plugin(plugin)
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except GajimPluginActivateException:
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pass
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def _plugin_is_active_in_global_config(self, plugin):
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return app.config.get_per('plugins', plugin.short_name, 'active')
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def _set_plugin_active_in_global_config(self, plugin, active=True):
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app.config.set_per('plugins', plugin.short_name, 'active', active)
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@staticmethod
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@log_calls('PluginManager')
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def scan_dir_for_plugins(path, scan_dirs=True, package=False):
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r'''
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Scans given directory for plugin classes.
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:param path: directory to scan for plugins
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:type path: str
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:param scan_dirs: folders inside path are processed as modules
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:type scan_dirs: boolean
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:param package: if path points to a single package folder
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:type package: boolean
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:return: list of found plugin classes (subclasses of `GajimPlugin`
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:rtype: [] of class objects
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:note: currently it only searches for plugin classes in '\*.py' files
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present in given direcotory `path` (no recursion here)
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:todo: add scanning zipped modules
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'''
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from gajim.plugins.plugins_i18n import _
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plugins_found = []
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conf = configparser.ConfigParser()
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fields = ('name', 'short_name', 'version', 'description', 'authors',
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'homepage')
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if not os.path.isdir(path):
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return plugins_found
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if package:
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path, package_name = os.path.split(path)
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dir_list = [package_name]
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else:
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dir_list = os.listdir(path)
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sys.path.insert(0, path)
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for elem_name in dir_list:
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file_path = os.path.join(path, elem_name)
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if os.path.isfile(file_path) and fnmatch.fnmatch(file_path, '*.py'):
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module_name = os.path.splitext(elem_name)[0]
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elif os.path.isdir(file_path) and scan_dirs:
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module_name = elem_name
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file_path += os.path.sep
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else:
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continue
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manifest_path = os.path.join(os.path.dirname(file_path),
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'manifest.ini')
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if scan_dirs and (not os.path.isfile(manifest_path)):
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continue
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# read metadata from manifest.ini
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conf.remove_section('info')
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with open(manifest_path, encoding='utf-8') as conf_file:
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try:
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conf.read_file(conf_file)
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except configparser.Error:
|
|
log.warning(("Plugin {plugin} not loaded, error loading"
|
|
" manifest").format(plugin=elem_name)
|
|
, exc_info=True)
|
|
continue
|
|
|
|
min_v = conf.get('info', 'min_gajim_version', fallback=None)
|
|
max_v = conf.get('info', 'max_gajim_version', fallback=None)
|
|
|
|
gajim_v = app.config.get('version').split('-', 1)[0]
|
|
gajim_v_cmp = parse_version(gajim_v)
|
|
|
|
if min_v and gajim_v_cmp < parse_version(min_v):
|
|
log.warning(('Plugin {plugin} not loaded, newer version of'
|
|
'gajim required: {gajim_v} < {min_v}').format(
|
|
plugin=elem_name,
|
|
gajim_v=gajim_v,
|
|
min_v=min_v
|
|
))
|
|
continue
|
|
if max_v and gajim_v_cmp > parse_version(max_v):
|
|
log.warning(('Plugin {plugin} not loaded, plugin incompatible '
|
|
'with current version of gajim: '
|
|
'{gajim_v} > {max_v}').format(
|
|
plugin=elem_name,
|
|
gajim_v=gajim_v,
|
|
max_v=max_v
|
|
))
|
|
continue
|
|
|
|
module = None
|
|
|
|
try:
|
|
if module_name in sys.modules:
|
|
if path == app.PLUGINS_DIRS[0]:
|
|
# Only reload plugins from Gajim base dir when they
|
|
# dont exist. This means plugins in the user path are
|
|
# always preferred.
|
|
continue
|
|
from imp import reload
|
|
log.info('Reloading %s', module_name)
|
|
module = reload(sys.modules[module_name])
|
|
else:
|
|
log.info('Loading %s', module_name)
|
|
module = __import__(module_name)
|
|
except Exception as error:
|
|
log.warning(
|
|
"While trying to load {plugin}, exception occurred".format(plugin=elem_name),
|
|
exc_info=sys.exc_info()
|
|
)
|
|
continue
|
|
|
|
if module is None:
|
|
continue
|
|
|
|
log.debug('Attributes processing started')
|
|
for module_attr_name in [attr_name for attr_name in dir(module)
|
|
if not (attr_name.startswith('__') or attr_name.endswith('__'))]:
|
|
module_attr = getattr(module, module_attr_name)
|
|
log.debug('%s : %s' % (module_attr_name, module_attr))
|
|
|
|
try:
|
|
if not issubclass(module_attr, GajimPlugin) or \
|
|
module_attr is GajimPlugin:
|
|
continue
|
|
log.debug('is subclass of GajimPlugin')
|
|
module_attr.__path__ = os.path.abspath(
|
|
os.path.dirname(file_path))
|
|
|
|
for option in fields:
|
|
if conf.get('info', option) is '':
|
|
raise configparser.NoOptionError('field empty')
|
|
if option == 'description':
|
|
setattr(module_attr, option, _(conf.get('info', option)))
|
|
continue
|
|
setattr(module_attr, option, conf.get('info', option))
|
|
|
|
plugins_found.append(module_attr)
|
|
except TypeError:
|
|
# set plugin localization
|
|
try:
|
|
module_attr._ = _
|
|
except AttributeError:
|
|
pass
|
|
except configparser.NoOptionError:
|
|
# all fields are required
|
|
log.debug('%s : %s' % (module_attr_name,
|
|
'wrong manifest file. all fields are required!'))
|
|
except configparser.NoSectionError:
|
|
# info section are required
|
|
log.debug('%s : %s' % (module_attr_name,
|
|
'wrong manifest file. info section are required!'))
|
|
except configparser.MissingSectionHeaderError:
|
|
# info section are required
|
|
log.debug('%s : %s' % (module_attr_name,
|
|
'wrong manifest file. section are required!'))
|
|
|
|
sys.path.remove(path)
|
|
return plugins_found
|
|
|
|
def install_from_zip(self, zip_filename, owerwrite=None):
|
|
'''
|
|
Install plugin from zip and return plugin
|
|
'''
|
|
try:
|
|
zip_file = zipfile.ZipFile(zip_filename)
|
|
except zipfile.BadZipfile:
|
|
# it is not zip file
|
|
raise PluginsystemError(_('Archive corrupted'))
|
|
except IOError:
|
|
raise PluginsystemError(_('Archive empty'))
|
|
|
|
if zip_file.testzip():
|
|
# CRC error
|
|
raise PluginsystemError(_('Archive corrupted'))
|
|
|
|
dirs = []
|
|
manifest = None
|
|
for filename in zip_file.namelist():
|
|
if filename.startswith('.') or filename.startswith('/') or \
|
|
('/' not in filename):
|
|
# members not safe
|
|
raise PluginsystemError(_('Archive is malformed'))
|
|
if filename.endswith('/') and filename.find('/', 0, -1) < 0:
|
|
dirs.append(filename.strip('/'))
|
|
if 'manifest.ini' in filename.split('/')[1]:
|
|
manifest = True
|
|
if not manifest:
|
|
return
|
|
if len(dirs) > 1:
|
|
raise PluginsystemError(_('Archive is malformed'))
|
|
|
|
base_dir, user_dir = app.PLUGINS_DIRS
|
|
plugin_dir = os.path.join(user_dir, dirs[0])
|
|
|
|
if os.path.isdir(plugin_dir):
|
|
# Plugin dir already exists
|
|
if not owerwrite:
|
|
raise PluginsystemError(_('Plugin already exists'))
|
|
self.remove_plugin(self.get_plugin_by_path(plugin_dir))
|
|
|
|
zip_file.extractall(user_dir)
|
|
zip_file.close()
|
|
|
|
plugins = self.scan_dir_for_plugins(plugin_dir, package=True)
|
|
if not plugins:
|
|
return
|
|
self.add_plugin(plugins[0])
|
|
plugin = self.plugins[-1]
|
|
return plugin
|
|
|
|
def remove_plugin(self, plugin):
|
|
'''
|
|
Deactivate and remove plugin from `plugins` list
|
|
'''
|
|
def on_error(func, path, error):
|
|
if func == os.path.islink:
|
|
# if symlink
|
|
os.unlink(path)
|
|
return
|
|
# access is denied or other
|
|
raise PluginsystemError(error[1][1])
|
|
|
|
if plugin:
|
|
if plugin.active:
|
|
self.deactivate_plugin(plugin)
|
|
rmtree(plugin.__path__, False, on_error)
|
|
self.plugins.remove(plugin)
|
|
if self._plugin_has_entry_in_global_config(plugin):
|
|
self._remove_plugin_entry_in_global_config(plugin)
|
|
del sys.modules[plugin.__module__.split('.')[0]]
|
|
del plugin.__module__.split('.')[-1]
|
|
del plugin
|
|
|
|
def get_plugin_by_path(self, plugin_dir):
|
|
for plugin in self.plugins:
|
|
if plugin.__path__ in plugin_dir:
|
|
return plugin
|