gajim3/gajim/plugins/gajimplugin.py

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# This file is part of Gajim.
#
# Gajim is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published
# by the Free Software Foundation; version 3 only.
#
# Gajim is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Gajim. If not, see <http://www.gnu.org/licenses/>.
'''
Base class for implementing plugin.
:author: Mateusz Biliński <mateusz@bilinski.it>
:since: 1st June 2008
:copyright: Copyright (2008) Mateusz Biliński <mateusz@bilinski.it>
:license: GPL
'''
from typing import List # pylint: disable=W0611
from typing import Tuple # pylint: disable=W0611
from typing import Dict # pylint: disable=W0611
from typing import Any # pylint: disable=W0611
import os
import locale
import logging
import pickle
from gajim.common import configpaths
from gajim.common.types import PluginExtensionPoints # pylint: disable=W0611
from gajim.common.types import EventHandlersDict # pylint: disable=W0611
from gajim.common.types import PluginEvents # pylint: disable=W0611
from gajim.plugins.helpers import log
from gajim.plugins.gui import GajimPluginConfigDialog
log = logging.getLogger('gajim.p.plugin')
class GajimPlugin:
'''
Base class for implementing Gajim plugins.
'''
name = ''
'''
Name of plugin.
Will be shown in plugins management GUI.
:type: str
'''
short_name = ''
'''
Short name of plugin.
Used for quick identification of plugin.
:type: str
:todo: decide whether we really need this one, because class name (with
module name) can act as such short name
'''
encryption_name = ''
'''
Name of the encryption scheme.
The name that Gajim displays in the encryption menu.
Leave empty if the plugin is not an encryption plugin.
:type: str
'''
version = ''
'''
Version of plugin.
:type: str
:todo: decide how to compare version between each other (which one
is higher). Also rethink: do we really need to compare versions
of plugins between each other? This would be only useful if we detect
same plugin class but with different version and we want only the newest
one to be active - is such policy good?
'''
description = ''
'''
Plugin description.
:type: str
:todo: should be allow rich text here (like HTML or reStructuredText)?
'''
authors = [] # type: List[str]
'''
Plugin authors.
:type: [] of str
:todo: should we decide on any particular format of author strings?
Especially: should we force format of giving author's e-mail?
'''
homepage = ''
'''
URL to plug-in's homepage.
:type: str
:todo: should we check whether provided string is valid URI? (Maybe
using 'property')
'''
gui_extension_points = {} # type: PluginExtensionPoints
'''
Extension points that plugin wants to connect with and handlers to be used.
Keys of this string should be strings with name of GUI extension point
to handles. Values should be 2-element tuples with references to handling
functions. First function will be used to connect plugin with extpoint,
the second one to successfully disconnect from it. Connecting takes places
when plugin is activated and extpoint already exists, or when plugin is
already activated but extpoint is being created (eg. chat window opens).
Disconnecting takes place when plugin is deactivated and extpoint exists
or when extpoint is destroyed and plugin is activate (eg. chat window
closed).
'''
config_default_values = {} # type: Dict[str, Tuple[Any, str]]
'''
Default values for keys that should be stored in plug-in config.
This dict is used when when someone calls for config option but it has not
been set yet.
Values are tuples: (default_value, option_description). The first one can
be anything (this is the advantage of using shelve/pickle instead of
custom-made config I/O handling); the second one should be str (gettext
can be used if need and/or translation is planned).
:type: {} of 2-element tuples
'''
events_handlers = {} # type: EventHandlersDict
'''
Dictionary with events handlers.
Keys are event names. Values should be 2-element tuples with handler
priority as first element and reference to handler function as second
element. Priority is integer. See `ged` module for predefined priorities
like `ged.PRECORE`, `ged.CORE` or `ged.POSTCORE`.
:type: {} with 2-element tuples
'''
events = [] # type: PluginEvents
'''
New network event classes to be registered in Network Events Controller.
:type: [] of `nec.NetworkIncomingEvent` or `nec.NetworkOutgoingEvent`
subclasses.
'''
def __init__(self) -> None:
self.config = GajimPluginConfig(self)
'''
Plug-in configuration dictionary.
Automatically saved and loaded and plug-in (un)load.
:type: `plugins.plugin.GajimPluginConfig`
'''
self.activatable = True
self.available_text = ''
self.load_config()
self.config_dialog = GajimPluginConfigDialog(self)
self.init()
def save_config(self) -> None:
self.config.save()
def load_config(self) -> None:
self.config.load()
def __eq__(self, plugin):
if self.short_name == plugin.short_name:
return True
return False
def __ne__(self, plugin):
if self.short_name != plugin.short_name:
return True
return False
def local_file_path(self, file_name):
return os.path.join(self.__path__, file_name)
def init(self):
pass
def activate(self):
pass
def deactivate(self):
pass
class GajimPluginConfig():
def __init__(self, plugin):
self.plugin = plugin
self.FILE_PATH = (configpaths.get('PLUGINS_CONFIG_DIR') /
self.plugin.short_name)
self.data = {}
def __getitem__(self, key):
if not key in self.data:
self.data[key] = self.plugin.config_default_values[key][0]
self.save()
return self.data[key]
def __setitem__(self, key, value):
self.data[key] = value
self.save()
def __delitem__(self, key):
del self.data[key]
self.save()
def __contains__(self, key):
return key in self.data
def __iter__(self):
for k in self.data.keys():
yield k
def keys(self):
return self.data.keys()
def items(self):
return self.data.items()
def save(self):
with open(self.FILE_PATH, 'wb') as fd:
pickle.dump(self.data, fd)
def load(self):
if not self.FILE_PATH.is_file():
self.data = {}
self.save()
return
with open(self.FILE_PATH, 'rb') as fd:
try:
self.data = pickle.load(fd)
except Exception:
try:
import shelve
s = shelve.open(self.FILE_PATH)
for (k, v) in s.items():
self.data[k] = v
if not isinstance(self.data, dict):
raise GajimPluginException
s.close()
self.save()
except Exception:
enc = locale.getpreferredencoding()
filename = self.FILE_PATH.decode(enc) + '.bak'
log.warning(
'%s plugin config file not readable. Saving it as '
'%s and creating a new one',
self.plugin.short_name, filename)
if os.path.exists(self.FILE_PATH + '.bak'):
os.remove(self.FILE_PATH + '.bak')
os.rename(self.FILE_PATH, self.FILE_PATH + '.bak')
self.data = {}
self.save()
class GajimPluginException(Exception):
pass
class GajimPluginInitError(GajimPluginException):
pass