Merge branch 'develop' into matrix-org-hotfixes

1 files changed, 10 insertions, 3 deletions

diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py

index 63793b1fcf..578320607e 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -243,7 +243,14 @@ class EventCreationHandler(object):
 
         self.spam_checker = hs.get_spam_checker()
 
-        if self.config.block_events_without_consent_error is not None:
+        self._block_events_without_consent_error = (
+            self.config.block_events_without_consent_error
+        )
+
+        # we need to construct a ConsentURIBuilder here, as it checks that the necessary
+        # config options, but *only* if we have a configuration for which we are
+        # going to need it.
+        if self._block_events_without_consent_error:
             self._consent_uri_builder = ConsentURIBuilder(self.config)
 
     @defer.inlineCallbacks
@@ -378,7 +385,7 @@ class EventCreationHandler(object):
         Raises:
             ConsentNotGivenError: if the user has not given consent yet
         """
-        if self.config.block_events_without_consent_error is None:
+        if self._block_events_without_consent_error is None:
             return
 
         # exempt AS users from needing consent
@@ -405,7 +412,7 @@ class EventCreationHandler(object):
         consent_uri = self._consent_uri_builder.build_user_consent_uri(
             requester.user.localpart,
         )
-        msg = self.config.block_events_without_consent_error % {
+        msg = self._block_events_without_consent_error % {
             'consent_uri': consent_uri,
         }
         raise ConsentNotGivenError(