2 files changed, 7 insertions, 3 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 65f2bd5000..1c5801fa51 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -231,8 +231,9 @@ class Auth(object):
 
             # Deny the request if the user account has expired.
             if self._account_validity.enabled:
-                expiration_ts = yield self.store.get_expiration_ts_for_user(user)
-                if self.clock.time_msec() >= expiration_ts:
+                user_id = user.to_string()
+                expiration_ts = yield self.store.get_expiration_ts_for_user(user_id)
+                if expiration_ts is not None and self.clock.time_msec() >= expiration_ts:
                     raise AuthError(
                         403,
                         "User account has expired",
@@ -548,7 +549,7 @@ class Auth(object):
         """ Check if the given user is a local server admin.
 
         Args:
-            user (str): mxid of user to check
+            user (UserID): user to check
 
         Returns:
             bool: True if the user is an admin
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 12a01c4ca3..5664c41793 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -20,6 +20,9 @@
 # the "depth" field on events is limited to 2**63 - 1
 MAX_DEPTH = 2**63 - 1
 
+# the maximum length for a room alias is 255 characters
+MAX_ALIAS_LENGTH = 255
+
 
 class Membership(object):