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'''
Created on Jun 24, 2010
@author: leifj
'''
from django.db import models
import re
from twisted.python.reflect import ObjectNotFound
from pprint import pprint
class Attribute(models.Model):
name = models.CharField(unique=True,max_length=255)
description = models.TextField(blank=True)
timecreated = models.DateTimeField(auto_now_add=True)
lastupdated = models.DateTimeField(auto_now=True)
def __unicode__(self):
return self.name;
class Name(models.Model):
'''
A name-space/authorization/right/group/collaboration/thing
'''
type = models.ForeignKey(Attribute, blank=True, null=True,related_name='names')
value = models.CharField(max_length=255)
parent = models.ForeignKey('self', blank=True, null=True,related_name='children')
partof = models.ForeignKey('self', blank=True, null=True,related_name='parts')
acl = models.TextField(blank=True) # fully-qualified-name '#' rights
short = models.CharField(max_length=64,blank=True)
description = models.TextField(blank=True)
timecreated = models.DateTimeField(auto_now_add=True)
lastupdated = models.DateTimeField(auto_now=True)
def shortname(self):
if self.short:
return self.short
else:
return self.__unicode__()
def relative_name(self):
if self.type:
return "%s=%s" % (self.type.name,self.value)
else:
return self.value
def __unicode__(self):
n = self
str = ""
while n:
sep = ""
av = n.relative_name()
if n.parent:
if av.find("=") == -1:
sep = ':'
else:
sep = ';'
str = sep+av+str
n = n.parent
return str
def has_permission(self,user,perm):
return True
def permitted_children(self,user,perm):
return filter(lambda s: s.has_permission(user,perm),self.children.all())
def roots():
return Name.objects.filter(parent=None)
def _traverse(name,callable,user,depth):
if not name:
return [_traverse(s,callable,user,depth - 1) for s in roots()]
else:
t = callable(name,depth)
if depth > 0:
children = [_traverse(s,callable,user,depth - 1) for s in name.permitted_children(user,'#l')]
if children:
t['children'] = children
return t
def traverse(name,callable,user,depth,includeroot=False):
if not name:
return [_traverse(s,callable,user,depth - 1) for s in roots()]
else:
if includeroot:
t = callable(name,depth)
if depth > 0:
children = [_traverse(s,callable,user,depth - 1) for s in name.permitted_children(user,'#l')]
if children:
t['children'] = children
return t
else:
return [_traverse(s,callable,user,depth - 1) for s in name.permitted_children(user,'#l')]
def walkto(root,nameparts,autocreate=False,autoacl='#l'):
name = None
for n in nameparts:
(a,eq,v) = n.partition('=')
if v:
attribute = Attribute.objects.get(name=a)
try:
name = Name.objects.get(parent=root,type=attribute.id,value=v)
except ObjectNotFound,e:
if autocreate:
name = Name.objects.create(parent=root,type=attribute.id,value=v,acl=autoacl)
else:
raise e
else:
try:
name = Name.objects.get(parent=root,type=None,value=a)
except ObjectNotFound,e:
if autocreate:
name = Name.objects.create(parent=root,type=None,value=a,acl=autoacl)
else:
raise e
return name
def lookup(name,autocreate=False,autoacl='#l'):
return walkto(None,nameparts=re.compile('[;:]').split(name),autocreate=autocreate,autoacl=autoacl)
def attribute(a):
Attribute.objects.get_or_create(name=a)
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