1 files changed, 48 insertions, 1 deletions
diff --git a/src/mailman/rest/validator.py b/src/mailman/rest/validator.py
index b325fdc84..d5f684df9 100644
--- a/src/mailman/rest/validator.py
+++ b/src/mailman/rest/validator.py
@@ -16,15 +16,35 @@
 # GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
 
 """REST web form validation."""
-
+from mailman.config import config
 from mailman.interfaces.address import IEmailValidator
 from mailman.interfaces.errors import MailmanError
 from mailman.interfaces.languages import ILanguageManager
+from mailman.interfaces.workflows import (ISubscriptionWorkflow,
+                                          IUnsubscriptionWorkflow)
+from mailman.workflows.subscription import (
+    ConfirmModerationSubscriptionPolicy, ConfirmSubscriptionPolicy,
+    ModerationSubscriptionPolicy, OpenSubscriptionPolicy)
+from mailman.workflows.unsubscription import (
+    ConfirmModerationUnsubscriptionPolicy, ConfirmUnsubscriptionPolicy,
+    ModerationUnsubscriptionPolicy, OpenUnsubscriptionPolicy)
 from public import public
 from zope.component import getUtility
 
 
 COMMASPACE = ', '
+OLD_SUB_MAP = {
+    'open': OpenSubscriptionPolicy,
+    'confirm': ConfirmSubscriptionPolicy,
+    'moderate': ModerationSubscriptionPolicy,
+    'confirm_then_moderate': ConfirmModerationSubscriptionPolicy
+    }
+OLD_UNSUB_MAP = {
+    'open': OpenUnsubscriptionPolicy,
+    'confirm': ConfirmUnsubscriptionPolicy,
+    'moderate': ModerationUnsubscriptionPolicy,
+    'confirm_then_moderate': ConfirmModerationUnsubscriptionPolicy
+    }
 
 
 @public
@@ -100,6 +120,33 @@ def list_of_strings_validator(values):
 
 
 @public
+class policy_validator:
+    """"""
+
+    def __init__(self, policy_interface):
+        self._policy_interface = policy_interface
+        if policy_interface is ISubscriptionWorkflow:
+            self._old_map = OLD_SUB_MAP
+        elif policy_interface is IUnsubscriptionWorkflow:
+            self._old_map = OLD_UNSUB_MAP
+        else:
+            raise ValueError('Expected a workflow interface.')
+
+    def __call__(self, policy):
+        if self._policy_interface.implementedBy(policy):
+            return policy
+        if (policy in config.workflows and
+                self._policy_interface.implementedBy(
+                        config.workflows[policy])):
+            return config.workflows[policy]
+        # For backwards compatibility.
+        policy = self._old_map.get(policy, None)
+        if policy is not None:
+            return policy
+        raise ValueError('Unknown policy: {}'.format(policy))
+
+
+@public
 class Validator:
     """A validator of parameter input."""