Fix Socket Mode builtin WebSocket masked payload unmasking (RFC 6455)#1858
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beejak wants to merge 1 commit intoslackapi:mainfrom
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Fix Socket Mode builtin WebSocket masked payload unmasking (RFC 6455)#1858beejak wants to merge 1 commit intoslackapi:mainfrom
beejak wants to merge 1 commit intoslackapi:mainfrom
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The masked-payload branch incorrectly used range(data_to_append) on bytes and attempted in-place XOR on an immutable bytes object. Unmasking now uses a bytearray per RFC 6455. Added a short comment that SHA-1 in Sec-WebSocket-Accept is required by RFC 6455 section 1.3. Made-with: Cursor
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Summary
This change fixes the masked WebSocket frame handling path in the builtin Socket Mode client (
slack_sdk/socket_mode/builtin/internals.py).The previous code used
range(data_to_append)wheredata_to_appendisbytes(invalid in Python 3) and attempted in-place XOR on an immutablebytesobject. Per RFC 6455, masking XORs octets; unmasking is now implemented with abytearrayandrange(len(...)).A short comment was also added in
_validate_sec_websocket_accept: SHA-1 forSec-WebSocket-Acceptis required by RFC 6455 section 1.3, not a discretionary hash upgrade to SHA-256.Verification
(2 passed locally.)
Context
Servers normally send unmasked frames to clients; the masked branch is uncommon but should be correct for compliance and tests that exercise masked server frames.