# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
-# -*- coding: utf-8 -*-
-
from copy import deepcopy
import ldap
+from django.db.models.fields import Field
from django.db.models.query import QuerySet as BaseQuerySet
from django.db.models.query_utils import Q
-from django.db.models.sql import BaseQuery
-from django.db.models.sql.where import WhereNode
+from django.db.models.sql import Query as BaseQuery
+from django.db.models.sql.where import WhereNode as BaseWhereNode, Constraint as BaseConstraint, AND, OR
import ldapdb
-def compile(q):
- filterstr = ""
- for item in q.children:
- if isinstance(item, WhereNode):
- filterstr += compile(item)
- continue
- table, column, type, x, y, values = item
- if q.negated:
- filterstr += "(!(%s=%s))" % (column,values[0])
+class Constraint(BaseConstraint):
+ """
+ An object that can be passed to WhereNode.add() and knows how to
+ pre-process itself prior to including in the WhereNode.
+ """
+ def process(self, lookup_type, value):
+ """
+ Returns a tuple of data suitable for inclusion in a WhereNode
+ instance.
+ """
+ # Because of circular imports, we need to import this here.
+ from django.db.models.base import ObjectDoesNotExist
+
+ if lookup_type == 'endswith':
+ params = ["*%s" % value]
+ elif lookup_type == 'startswith':
+ params = ["%s*" % value]
+ elif lookup_type == 'exact':
+ params = [value]
+ else:
+ raise TypeError("Field has invalid lookup: %s" % lookup_type)
+
+ try:
+ if self.field:
+ db_type = self.field.db_type()
+ else:
+ db_type = None
+ except ObjectDoesNotExist:
+ raise EmptyShortCircuit
+
+ return (self.alias, self.col, db_type), params
+
+class WhereNode(BaseWhereNode):
+ def add(self, data, connector):
+ if not isinstance(data, (list, tuple)):
+ super(WhereNode, self).add(data, connector)
+ return
+
+ # we replace the native Constraint by our own
+ obj, lookup_type, value = data
+ if hasattr(obj, "process"):
+ obj = Constraint(obj.alias, obj.col, obj.field)
+ super(WhereNode, self).add((obj, lookup_type, value), connector)
+
+ def as_sql(self):
+ bits = []
+ for item in self.children:
+ if isinstance(item, WhereNode):
+ bits.append(item.as_sql())
+ continue
+ if len(item) == 4:
+ # django 1.1
+ (table, column, type), x, y, values = item
+ else:
+ # django 1.0
+ table, column, type, x, y, values = item
+ equal_bits = [ "(%s=%s)" % (column, value) for value in values ]
+ if len(equal_bits) == 1:
+ clause = equal_bits[0]
+ else:
+ clause = '(|%s)' % ''.join(equal_bits)
+ if self.negated:
+ bits.append('(!%s)' % clause)
+ else:
+ bits.append(clause)
+ if len(bits) == 1:
+ return bits[0]
+ elif self.connector == AND:
+ return '(&%s)' % ''.join(bits)
+ elif self.connector == OR:
+ return '(|%s)' % ''.join(bits)
else:
- filterstr += "(%s=%s)" % (column,values[0])
- return filterstr
+ raise Exception("Unhandled WHERE connector: %s" % self.connector)
class Query(BaseQuery):
def results_iter(self):
# FIXME: use all object classes
- filterstr = '(objectClass=%s)' % self.model._meta.object_classes[0]
- filterstr += compile(self.where)
+ filterstr = '(objectClass=%s)' % self.model.object_classes[0]
+ filterstr += self.where.as_sql()
filterstr = '(&%s)' % filterstr
attrlist = [ x.db_column for x in self.model._meta.local_fields if x.db_column ]
try:
vals = ldapdb.connection.search_s(
- self.model._meta.dn,
+ self.model.base_dn,
ldap.SCOPE_SUBTREE,
filterstr=filterstr,
attrlist=attrlist,
except:
raise self.model.DoesNotExist
+ # perform sorting
+ if self.extra_order_by:
+ ordering = self.extra_order_by
+ elif not self.default_ordering:
+ ordering = self.order_by
+ else:
+ ordering = self.order_by or self.model._meta.ordering
+ def getkey(x):
+ keys = []
+ for k in ordering:
+ attr = self.model._meta.get_field(k).db_column
+ keys.append(x[1].get(attr, '').lower())
+ return keys
+ vals = sorted(vals, key=lambda x: getkey(x))
+
+ # process results
for dn, attrs in vals:
- row = [dn]
+ row = []
for field in iter(self.model._meta.fields):
- row.append(attrs.get(field.db_column, None))
+ if field.attname == 'dn':
+ row.append(dn)
+ else:
+ row.append(attrs.get(field.db_column, None))
yield row
class QuerySet(BaseQuerySet):
def __init__(self, model=None, query=None):
if not query:
- query = Query(model, None)
+ query = Query(model, None, WhereNode)
super(QuerySet, self).__init__(model, query)