Added Object.get_dn() method; added corresponding unit tests

ipa_server/plugins/b_ldap.py

@@ -23,6 +23,7 @@ Backend plugin for LDAP.
 This wraps the python-ldap bindings.
 """
 
+import ldap as _ldap
 from ipalib import api
 from ipalib.backend import Backend
 
@@ -32,4 +33,6 @@ class ldap(Backend):
     LDAP backend plugin.
     """
 
+    dn = _ldap.dn
+
 api.register(ldap)

ipalib/frontend.py

@@ -750,6 +750,7 @@ class Object(plugable.Plugin):
         'params',
         'primary_key',
         'params_minus_pk',
+        'get_dn',
     ))
     backend = None
     methods = None
@@ -790,6 +791,12 @@ class Object(plugable.Plugin):
         if 'Backend' in self.api and self.backend_name in self.api.Backend:
             self.backend = self.api.Backend[self.backend_name]
 
+    def get_dn(self, primary_key):
+        """
+        Construct an LDAP DN from a primary_key.
+        """
+        raise NotImplementedError('%s.get_dn()' % self.name)
+
     def __get_attrs(self, name):
         if name not in self.api:
             return

tests/test_ipalib/test_frontend.py

@@ -963,6 +963,20 @@ class test_Object(ClassChecker):
         assert isinstance(b, ldap)
         assert b.whatever == 'It worked!'
 
+    def test_get_dn(self):
+        """
+        Test the `ipalib.frontend.Object.get_dn` method.
+        """
+        assert 'get_dn' in self.cls.__public__ # Public
+        o = self.cls()
+        e = raises(NotImplementedError, o.get_dn, 'primary key')
+        assert str(e) == 'Object.get_dn()'
+        class user(self.cls):
+            pass
+        o = user()
+        e = raises(NotImplementedError, o.get_dn, 'primary key')
+        assert str(e) == 'user.get_dn()'
+
 
 class test_Attribute(ClassChecker):
     """