1 files changed, 13 insertions, 0 deletions
diff --git a/synapse/api/errors.py b/synapse/api/errors.py
index 2b049debf3..55181fe77e 100644
--- a/synapse/api/errors.py
+++ b/synapse/api/errors.py
@@ -21,6 +21,7 @@ logger = logging.getLogger(__name__)
 
 
 class Codes(object):
+    UNRECOGNIZED = "M_UNRECOGNIZED"
     UNAUTHORIZED = "M_UNAUTHORIZED"
     FORBIDDEN = "M_FORBIDDEN"
     BAD_JSON = "M_BAD_JSON"
@@ -34,6 +35,7 @@ class Codes(object):
     LIMIT_EXCEEDED = "M_LIMIT_EXCEEDED"
     CAPTCHA_NEEDED = "M_CAPTCHA_NEEDED"
     CAPTCHA_INVALID = "M_CAPTCHA_INVALID"
+    MISSING_PARAM = "M_MISSING_PARAM",
     TOO_LARGE = "M_TOO_LARGE"
 
 
@@ -81,6 +83,17 @@ class RegistrationError(SynapseError):
     pass
 
 
+class UnrecognizedRequestError(SynapseError):
+    """An error indicating we don't understand the request you're trying to make"""
+    def __init__(self, *args, **kwargs):
+        if "errcode" not in kwargs:
+            kwargs["errcode"] = Codes.NOT_FOUND
+        super(UnrecognizedRequestError, self).__init__(
+            400,
+            "Unrecognized request",
+            **kwargs
+        )
+
 class AuthError(SynapseError):
     """An error raised when there was a problem authorising an event."""