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__init__.py
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__init__.py
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from exceptions import TypeError, ValueError
from django.contrib.auth.models import User
from models import PermissionModel # importing custom permission models
from djime.models import Slip as Model #importing a custom model to show princip.
import new
import inspect
# MetaClass and MetaObject is taken form the django-granular-permissions app.
# This enables us to inject new permission methods to any given model.
class MetaClass(type):
def __new__(self, classname, classbases, classdict):
try:
frame = inspect.currentframe()
frame = frame.f_back
if frame.f_locals.has_key(classname):
old_class = frame.f_locals.get(classname)
for name,func in classdict.items():
if inspect.isfunction(func):
setattr(old_class, name, func)
return old_class
return type.__new__(self, classname, classbases, classdict)
finally:
del frame
class MetaObject(object):
__metaclass__ = MetaClass
class Model(MetaObject):
def has_permission(self, user_input):
# we are both accepting a user object or a user id.
if type(user_input) == int:
# a user id has been entered. We're on purpose letting django
# handle raising an error if the user does not exist.
user = User.objects.get(pk=user_input)
elif type(user_input) == User:
# a userobject has been entered
user = user_input
else:
# an invalid input, raise an error.
raise TypeError("The input for %s must be either an integer or userobject." % self.has_permission)
# if user is superuser, we will return information about that, acapella
# wont hindel superusers access.
if user.is_superuser:
return "User %s is superuser and has all access" % user
perm = PermissionModel.objects.filter(model=self, user=user)
# check to see if there is any info for the given user and object
if not perm:
return "No permissions has been entered for user %(user)s and object %(object)s" % {'user': user, 'object': self}
else:
return perm[0].PERMISSION_CHOICES[perm[0].permission][1]
def check_permission(self, user_input, permission):
if type(user_input) == int:
user = User.objects.get(pk=user_input)
elif type(user_input) == User:
user = user_input
else:
raise TypeError("The user input for %s must be either an integer or userobject." % self.has_permission)
if user.is_superuser:
return True
# Check to see if the permission is a list, only integers are accepted.
if type(permission) not in [str, unicode]:
raise TypeError("The permissions input for %s must be entered in a string." % self.check_permission)
if permission not in ['read', 'Read',
'write', 'Write',
'delete', 'Delete',
u'read', u'Read',
u'write', u'Write',
u'delete', u'Delete']:
return ValueError("The permission inout for %s must be read, write or delete" % self.check_permission)
if permission in ['read', 'Read', u'read', u'Read']:
perm_list = [1,3,5,7]
elif permission in ['write', 'Write', u'write', u'Write']:
perm_list = [2,3,6,7]
else:
perm_list = [4,5,6,7]
perm = PermissionModel.objects.filter(model=self, user=user)
# if no permissions has been entered for the user on this object,
# returning True as acapella wont hinder access unless explicit ordered.
if not perm:
return True
# check to see if the permission is in the list of provided permissions.
if perm[0].permission in perm_list:
return True
return False
def add_permission(self, user_input, permission):
if type(user_input) == int:
user = User.objects.get(pk=user_input)
elif type(user_input) == User:
user = user_input
else:
raise TypeError("The user input for %s must be either an integer or userobject." % self.has_permission)
if type(permission) not in [str, unicode]:
raise TypeError("The permissions input for %s must be entered in a string." % self.check_permission)
if permission not in ['read', 'Read',
'write', 'Write',
'delete', 'Delete',
u'read', u'Read',
u'write', u'Write',
u'delete', u'Delete']:
return ValueError("The permission inout for %s must be read, write or delete" % self.check_permission)
if permission in ['read', 'Read', u'read', u'Read']:
perm_list = [1,3,5,7]
perm_int = 1
elif permission in ['write', 'Write', u'write', u'Write']:
perm_list = [2,3,6,7]
perm_int = 2
else:
perm_list = [4,5,6,7]
perm_int = 4
perm = PermissionModel.objects.filter(model=self, user=user)
if not perm:
new_perm = PermissionModel(model=self, user=user, permission=perm_int)
new_perm.save()
return 'New permission %(permission)s for user %(user)s on object %(model)s has been created' % {'permission': permission,
'user': user,
'model': self}
else:
perm = perm[0]
if not perm.permission in perm_list:
# To add a permission we just need to add the permission integer
# to the integer permission value.
perm.permission += perm_int
perm.save()
return 'Permission %(permission)s for user %(user)s on object %(model)s has been added' % {'permission': permission,
'user': user,
'model': self}
return 'Permission %(permission)s for user %(user)s on object %(model)s already existed' % {'permission': permission,
'user': user,
'model': self}
def del_permission(self, user_input, permission):
if type(user_input) == int:
user = User.objects.get(pk=user_input)
elif type(user_input) == User:
user = user_input
else:
raise TypeError("The user input for %s must be either an integer or userobject." % self.has_permission)
if type(permission) not in [str, unicode]:
raise TypeError("The permissions input for %s must be entered in a string." % self.check_permission)
if permission not in ['read', 'Read',
'write', 'Write',
'delete', 'Delete',
u'read', u'Read',
u'write', u'Write',
u'delete', u'Delete']:
return ValueError("The permission inout for %s must be read, write or delete" % self.check_permission)
if permission in ['read', 'Read', u'read', u'Read']:
perm_list = [1,3,5,7]
perm_int = 1
elif permission in ['write', 'Write', u'write', u'Write']:
perm_list = [2,3,6,7]
perm_int = 2
else:
perm_list = [4,5,6,7]
perm_int = 4
perm = PermissionModel.objects.filter(model=self, user=user)
if not perm:
# if no permission has been created for the user on the object, we
# create a new permission with no access perm_int = 0
new_perm = PermissionModel(model=self, user=user, permission=0)
new_perm.save()
return 'New permission for user %(user)s on object %(model)s with no access has been created' % {'user': user,
'model': self}
else:
perm = perm[0]
if perm.permission in perm_list:
# To delete a perm, we can just substract the permission
# integer.
perm.permission -= perm_int
perm.save()
return 'Permission %(permission)s for user %(user)s on object %(model)s has been deleted' % {'permission': permission,
'user': user,
'model': self}
return 'User %(user)s on object %(model)s did not have the permission %(permission)s' % {'permission': permission,
'user': user,
'model': self}