ldapdb/models/base.py

   1 # -*- coding: utf-8 -*-
   2 #
   3 # django-ldapdb
   4 # Copyright (c) 2009-2010, Bolloré telecom
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  33 #
  34
  35 import ldap
  36 import logging
  37
  38 import django.db.models
  39 from django.db import connections, router
  40 from django.db.models import signals
  41
  42 import ldapdb
  43
  44 class Model(django.db.models.base.Model):
  45     """
  46     Base class for all LDAP models.
  47     """
  48     dn = django.db.models.fields.CharField(max_length=200)
  49
  50     # meta-data
  51     base_dn = None
  52     search_scope = ldap.SCOPE_SUBTREE
  53     object_classes = ['top']
  54
  55     def __init__(self, *args, **kwargs):
  56         super(Model, self).__init__(*args, **kwargs)
  57         self.saved_pk = self.pk
  58
  59     def build_rdn(self):
  60         """
  61         Build the Relative Distinguished Name for this entry.
  62         """
  63         bits = []
  64         for field in self._meta.fields:
  65             if field.db_column and field.primary_key:
  66                 bits.append("%s=%s" % (field.db_column, getattr(self, field.name)))
  67         if not len(bits):
  68             raise Exception("Could not build Distinguished Name")
  69         return '+'.join(bits)
  70
  71     def build_dn(self):
  72         """
  73         Build the Distinguished Name for this entry.
  74         """
  75         return "%s,%s" % (self.build_rdn(), self.base_dn)
  76         raise Exception("Could not build Distinguished Name")
  77
  78     def delete(self, using=None):
  79         """
  80         Delete this entry.
  81         """
  82         using = using or router.db_for_write(self.__class__, instance=self)
  83         connection = connections[using]
  84         logging.debug("Deleting LDAP entry %s" % self.dn)
  85         connection.delete_s(self.dn)
  86         signals.post_delete.send(sender=self.__class__, instance=self)
  87
  88     def save(self, using=None):
  89         """
  90         Saves the current instance.
  91         """
  92         using = using or router.db_for_write(self.__class__, instance=self)
  93         connection = connections[using]
  94         if not self.dn:
  95             # create a new entry
  96             record_exists = False
  97             entry = [('objectClass', self.object_classes)]
  98             new_dn = self.build_dn()
  99
 100             for field in self._meta.fields:
 101                 if not field.db_column:
 102                     continue
 103                 value = getattr(self, field.name)
 104                 if value:
 105                     entry.append((field.db_column, field.get_db_prep_save(value, connection=connection)))
 106
 107             logging.debug("Creating new LDAP entry %s" % new_dn)
 108             connection.add_s(new_dn, entry)
 109
 110             # update object
 111             self.dn = new_dn
 112
 113         else:
 114             # update an existing entry
 115             record_exists = True
 116             modlist = []
 117             orig = self.__class__.objects.get(pk=self.saved_pk)
 118             for field in self._meta.fields:
 119                 if not field.db_column:
 120                     continue
 121                 old_value = getattr(orig, field.name, None)
 122                 new_value = getattr(self, field.name, None)
 123                 if old_value != new_value:
 124                     if new_value:
 125                         modlist.append((ldap.MOD_REPLACE, field.db_column, field.get_db_prep_save(new_value, connection=connection)))
 126                     elif old_value:
 127                         modlist.append((ldap.MOD_DELETE, field.db_column, None))
 128
 129             if len(modlist):
 130                 # handle renaming
 131                 new_dn = self.build_dn()
 132                 if new_dn != self.dn:
 133                     logging.debug("Renaming LDAP entry %s to %s" % (self.dn, new_dn))
 134                     connection.rename_s(self.dn, self.build_rdn())
 135                     self.dn = new_dn
 136
 137                 logging.debug("Modifying existing LDAP entry %s" % self.dn)
 138                 connection.modify_s(self.dn, modlist)
 139             else:
 140                 logging.debug("No changes to be saved to LDAP entry %s" % self.dn)
 141
 142         # done
 143         self.saved_pk = self.pk
 144         signals.post_save.send(sender=self.__class__, instance=self, created=(not record_exists))
 145
 146     @classmethod
 147     def scoped(base_class, base_dn):
 148         """
 149         Returns a copy of the current class with a different base_dn.
 150         """
 151         import new
 152         import re
 153         suffix = re.sub('[=,]', '_', base_dn)
 154         name = "%s_%s" % (base_class.__name__, str(suffix))
 155         new_class = new.classobj(name, (base_class,), {'base_dn': base_dn, '__module__': base_class.__module__})
 156         return new_class
 157
 158     class Meta:
 159         abstract = True