+def escape_ldap_filter(value):
+ value = str(value)
+ return value.replace('\\', '\\5c') \
+ .replace('*', '\\2a') \
+ .replace('(', '\\28') \
+ .replace(')', '\\29') \
+ .replace('\0', '\\00')
+
+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" % escape_ldap_filter(value)]
+ elif lookup_type == 'startswith':
+ params = ["%s*" % escape_ldap_filter(value)]
+ elif lookup_type == 'contains':
+ params = ["*%s*" % escape_ldap_filter(value)]
+ elif lookup_type == 'exact':
+ params = [escape_ldap_filter(value)]
+ elif lookup_type == 'in':
+ params = [escape_ldap_filter(v) for v in 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
+