142 lines
5.4 KiB
Python
142 lines
5.4 KiB
Python
import logging
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import sys
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import types
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from django.db import models
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from django.contrib.contenttypes.models import ContentType
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from django.db.models.base import ModelBase
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from django.template.defaultfilters import capfirst
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from common.models import AnonymousUserSingleton
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logger = logging.getLogger(__name__)
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_cache = {}
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class EncapsulatedObject(object):
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source_object_name = u'source_object'
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@classmethod
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def add_to_class(cls, name, value):
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if hasattr(value, 'contribute_to_class'):
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value.contribute_to_class(cls, name)
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else:
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setattr(cls, name, value)
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@classmethod
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def set_source_object_name(cls, new_name):
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cls.source_object_name = new_name
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@classmethod
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def encapsulate(cls, source_object=None, app_label=None, model=None, pk=None):
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if source_object:
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source_object = AnonymousUserSingleton.objects.passthru_check(source_object)
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content_type = ContentType.objects.get_for_model(source_object)
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elif app_label and model:
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try:
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content_type = ContentType.objects.get(app_label=app_label, model=model)
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source_object_model_class = content_type.model_class()
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if pk:
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source_object = content_type.get_object_for_this_type(pk=pk)
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else:
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source_object = source_object_model_class
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except ContentType.DoesNotExist:
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#cls.add_to_class('DoesNotExist', subclass_exception('DoesNotExist', (ObjectDoesNotExist,), cls.__name__))
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#raise cls.DoesNotExist("%s matching query does not exist." % ContentType._meta.object_name)
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raise ObjectDoesNotExist("%s matching query does not exist." % ContentType._meta.object_name)
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except source_object_model_class.DoesNotExist:
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#cls.add_to_class('DoesNotExist', subclass_exception('DoesNotExist', (ObjectDoesNotExist,), cls.__name__))
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#raise cls.DoesNotExist("%s matching query does not exist." % source_object_model_class._meta.object_name)
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raise ObjectDoesNotExist("%s matching query does not exist." % source_object_model_class._meta.object_name)
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if hasattr(source_object, 'pk'):
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# Object
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object_key = '%s.%s.%s.%s' % (cls.__name__, content_type.app_label, content_type.model, source_object.pk)
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else:
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# Class
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object_key = '%s.%s.%s' % (cls.__name__, content_type.app_label, content_type.model)
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try:
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return _cache[object_key]
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except KeyError:
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encapsulated_object = cls(source_object)
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_cache[object_key] = encapsulated_object
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return encapsulated_object
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@classmethod
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def get(cls, gid):
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elements = gid.split('.')
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if len(elements) == 3:
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app_label, model, pk = elements[0], elements[1], elements[2]
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object_key = '%s.%s.%s.%s' % (cls.__name__, app_label, model, pk)
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elif len(elements) == 2:
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app_label, model = elements[0], elements[1]
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pk = None
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object_key = '%s.%s.%s' % (cls.__name__, app_label, model)
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try:
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return _cache[object_key]
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except KeyError:
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if pk:
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return cls.encapsulate(app_label=app_label, model=model, pk=pk)
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else:
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return cls.encapsulate(app_label=app_label, model=model)
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def __init__(self, source_object):
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self.content_type = ContentType.objects.get_for_model(source_object)
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self.ct_fullname = '%s.%s' % (self.content_type.app_label, self.content_type.name)
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if isinstance(source_object, ModelBase):
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# Class
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self.gid = '%s.%s' % (self.content_type.app_label, self.content_type.model)
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else:
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# Object
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self.gid = '%s.%s.%s' % (self.content_type.app_label, self.content_type.model, source_object.pk)
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setattr(self, self.__class__.source_object_name, source_object)
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def __unicode__(self):
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if isinstance(self.source_object, ModelBase):
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return capfirst(unicode(self.source_object._meta.verbose_name_plural))
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elif self.ct_fullname == 'auth.user':
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return u'%s %s' % (self.source_object._meta.verbose_name, self.source_object.get_full_name())
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else:
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return u'%s %s' % (self.source_object._meta.verbose_name, self.source_object)
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def __repr__(self):
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return self.__unicode__()
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@property
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def source_object(self):
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return getattr(self, self.__class__.source_object_name, None)
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def get_class_permissions(self):
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return _class_permissions.get(self.content_type.model_class(), [])
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class AccessHolder(EncapsulatedObject):
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source_object_name = u'holder_object'
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class AccessObject(EncapsulatedObject):
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source_object_name = u'obj'
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class AccessObjectClass(EncapsulatedObject):
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source_object_name = u'cls'
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class ClassAccessHolder(EncapsulatedObject):
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source_object_name = u'class_holder'
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if sys.version_info < (2, 5):
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# Prior to Python 2.5, Exception was an old-style class
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def subclass_exception(name, parents, unused):
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return types.ClassType(name, parents, {})
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else:
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def subclass_exception(name, parents, module):
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return type(name, parents, {'__module__': module})
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