[PATCH b4 v2 5/5] misc/send-receive: require messages payload to be a list

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

In Python, str is a subclass of collections.abc.Sequence, so checking
isinstance(umsgs, Sequence) accepts a bare string value for "messages"
and iterates over individual characters during validation.

Check isinstance(umsgs, list) directly so non-array JSON values for
"messages" immediately fail with "Invalid messages array".

Assisted-by: LLM
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 misc/send-receive.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/misc/send-receive.py b/misc/send-receive.py
index 22e049b..96eb3fb 100644
--- a/misc/send-receive.py
+++ b/misc/send-receive.py
@@ -514,7 +514,7 @@ class SendReceiveListener(object):
         if not umsgs:
             self.send_error(resp, message='Missing the messages array')
             return
-        if not isinstance(umsgs, Sequence):
+        if not isinstance(umsgs, list):
             self.send_error(resp, message='Invalid messages array')
             return
         logger.debug('Received a request for %s messages', len(umsgs))

-- 
2.56.0.385.gd3acb90ef8-goog