move Protocol.is_enabled to User.is_enabled

models.py

@@ -358,6 +358,47 @@ class User(StringIdModel, metaclass=ProtocolUserMeta):
 
         return None
 
+    def is_enabled(self, to_proto):
+        """Returns True if this user can be bridged to a given protocol.
+
+        Reasons this might return False:
+        * We haven't turned on bridging these two protocols yet.
+        * The user is opted out.
+        * The user is on a domain that's opted out.
+        * The from protocol requires opt in, and the user hasn't opted in.
+
+        Args:
+          to_proto (Protocol subclass)
+
+        Returns:
+          bool:
+        """
+        from protocol import Protocol
+        assert issubclass(to_proto, Protocol)
+
+        if self.__class__ == to_proto:
+            return True
+
+        from_label = self.LABEL
+        to_label = to_proto.LABEL
+
+        # unit tests
+        if DEBUG and (from_label in ('fake', 'other')
+                      or (to_label in ('fake', 'other') and from_label != 'eefake')):
+            return True
+
+        if bot_protocol := Protocol.for_bridgy_subdomain(self.key.id()):
+            return to_proto != bot_protocol
+
+        if self.status == 'opt-out':
+            return False
+
+        if (to_label in self.enabled_protocols
+            or to_label in self.DEFAULT_ENABLED_PROTOCOLS):
+            return True
+
+        return False
+
     @ndb.transactional()
     def enable_protocol(self, to_proto):
         """Adds ``to_proto` to :attr:`enabled_protocols`.

protocol.py

@@ -143,45 +143,6 @@ class Protocol:
             label = domain.removesuffix(common.SUPERDOMAIN)
             return PROTOCOLS.get(label)
 
-    def is_enabled(self, to_proto):
-        """Returns True if this user can be bridged to a given protocol.
-
-        Reasons this might return False:
-        * We haven't turned on bridging these two protocols yet.
-        * The user is opted out.
-        * The user is on a domain that's opted out.
-        * The from protocol requires opt in, and the user hasn't opted in.
-
-        Args:
-          to_proto (Protocol subclass)
-
-        Returns:
-          bool:
-        """
-        assert issubclass(to_proto, Protocol)
-        if self.__class__ == to_proto:
-            return True
-
-        from_label = self.LABEL
-        to_label = to_proto.LABEL
-
-        # unit tests
-        if DEBUG and (from_label in ('fake', 'other')
-                      or (to_label in ('fake', 'other') and from_label != 'eefake')):
-            return True
-
-        if bot_protocol := Protocol.for_bridgy_subdomain(self.key.id()):
-            return to_proto != bot_protocol
-
-        if self.status == 'opt-out':
-            return False
-
-        if (to_label in self.enabled_protocols
-            or to_label in self.DEFAULT_ENABLED_PROTOCOLS):
-            return True
-
-        return False
-
     @classmethod
     def owns_id(cls, id):
         """Returns whether this protocol owns the id, or None if it's unclear.