Stop advertising unsupported flows for registration (#6107)

If email or msisdn verification aren't supported, let's stop advertising them
for registration.

Fixes #6100.

1 files changed, 10 insertions, 1 deletions

diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index f920c2f6c1..333eb30625 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -61,7 +61,8 @@ class AuthHandler(BaseHandler):
         self.checkers = {}  # type: dict[str, UserInteractiveAuthChecker]
         for auth_checker_class in INTERACTIVE_AUTH_CHECKERS:
             inst = auth_checker_class(hs)
-            self.checkers[inst.AUTH_TYPE] = inst
+            if inst.is_enabled():
+                self.checkers[inst.AUTH_TYPE] = inst
 
         self.bcrypt_rounds = hs.config.bcrypt_rounds
 
@@ -156,6 +157,14 @@ class AuthHandler(BaseHandler):
 
         return params
 
+    def get_enabled_auth_types(self):
+        """Return the enabled user-interactive authentication types
+
+        Returns the UI-Auth types which are supported by the homeserver's current
+        config.
+        """
+        return self.checkers.keys()
+
     @defer.inlineCallbacks
     def check_auth(self, flows, clientdict, clientip):
         """