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-rw-r--r--synapse/api/errors.py8
1 files changed, 8 insertions, 0 deletions
diff --git a/synapse/api/errors.py b/synapse/api/errors.py
index a3f314118a..4888c0ec4d 100644
--- a/synapse/api/errors.py
+++ b/synapse/api/errors.py
@@ -604,3 +604,11 @@ class HttpResponseException(CodeMessageException):
         errmsg = j.pop("error", self.msg)
 
         return ProxiedRequestError(self.code, errmsg, errcode, j)
+
+
+class ShadowBanError(Exception):
+    """
+    Raised when a shadow-banned user attempts to perform an action.
+
+    This should be caught and a proper "fake" success response sent to the user.
+    """