From 7e04b205fa423ee0aa0160906a286cd0ddcf2d76 Mon Sep 17 00:00:00 2001
From: Steve Howell <steve@zulip.com>
Date: Thu, 12 Dec 2013 22:16:47 -0500
Subject: [PATCH] Add type checking to events_register_backend.

(imported from commit bb3ddbfc0e471f276858d47fbdb65c890af41606)
---
 zerver/views/__init__.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/zerver/views/__init__.py b/zerver/views/__init__.py
index 8cf506d608..54ff2de2ed 100644
--- a/zerver/views/__init__.py
+++ b/zerver/views/__init__.py
@@ -2117,6 +2117,11 @@ def events_register_backend(request, user_profile, apply_markdown=True,
                             event_types=REQ(converter=json_to_list, default=None),
                             narrow=REQ(converter=json_to_list, default=[]),
                             queue_lifespan_secs=REQ(converter=int, default=0)):
+
+    error = check_list(check_string)('event_types', event_types)
+    if error:
+        raise JsonableError(error)
+
     ret = do_events_register(user_profile, request.client, apply_markdown,
                              event_types, queue_lifespan_secs, all_public_streams,
                              narrow=narrow)