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55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
import cfg
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class PluginMount(type):
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"""See http://martyalchin.com/2008/jan/10/simple-plugin-framework/ for documentation"""
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def __init__(cls, name, bases, attrs):
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if not hasattr(cls, 'plugins'):
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cls.plugins = []
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else:
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cls.plugins.append(cls)
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def init_plugins(cls, *args, **kwargs):
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try:
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cls.plugins = sorted(cls.plugins, key=lambda x: x.order, reverse=False)
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except AttributeError:
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pass
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return [p(*args, **kwargs) for p in cls.plugins]
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def get_plugins(cls, *args, **kwargs):
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return cls.init_plugins(*args, **kwargs)
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class MultiplePluginViolation(Exception):
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"""Multiple plugins found for a type where only one is expected"""
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pass
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class PluginMountSingular(PluginMount):
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"""Plugin mounter that allows only one plugin of this meta type"""
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def __init__(cls, name, bases, attrs):
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if not hasattr(cls, 'plugins'):
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cls.plugins = []
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else:
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if len(cls.plugins) > 0:
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raise MultiplePluginViolation
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cls.plugins.append(cls)
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class UserStoreModule(object):
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"""
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Mount Point for plugins that will manage the user backend storage,
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where we keep a hash for each user.
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Plugins implementing this reference should provide the following
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methods, as described in the doc strings of the default
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user_store.py: get, get_all, set, exists, remove, attr, expert.
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See source code for doc strings.
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This is designed as a plugin so mutiple types of user store can be
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supported. But the project is moving towards LDAP for
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compatibility with third party software. A future version of
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Plinth is likely to require LDAP.
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"""
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# Singular because we can only use one user store at a time
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__metaclass__ = PluginMountSingular
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