Fix network clients authentication for OKX

Thanks for reporting @S3toGreen

Author: cjdsellers

RELEASES.md

@@ -48,6 +48,7 @@ Released on TBD (UTC).
 - Fixed the instrument class of `IndexInstrument`, changing to `SPOT` to correctly represent a spot index of underlying constituents
 - Fixed data range request `end` handling for `DataEngine`
 - Fixed unsubscribe instrument close for `DataEngine`
+- Fixed network clients authentication for OKX (#2553), thanks for reporting @S3toGreen
 - Reverted removal of rotate log file on UTC date change (#2552), thanks @twitu
 
 ### Documentation Updates

nautilus_trader/adapters/okx/http/client.py

@@ -131,7 +131,7 @@ def _sign(self, timestamp: str, method: str, url_path: str, body: str) -> str:
         if body == "{}" or body == "None":
             body = ""
         message = str(timestamp) + method.upper() + url_path + body
-        digest = hmac_signature(self._api_secret, message).encode()
+        digest = bytes.fromhex(hmac_signature(self._api_secret, message))
         return base64.b64encode(digest).decode()
 
     async def send_request(

nautilus_trader/adapters/okx/websocket/client.py

@@ -1004,7 +1004,7 @@ async def _login(self):
 
         timestamp = int(self._clock.timestamp())
         message = str(timestamp) + "GET/users/self/verify"
-        digest = hmac_signature(self._api_secret, message).encode()
+        digest = bytes.fromhex(hmac_signature(self._api_secret, message))
         sign = base64.b64encode(digest).decode()
         payload = {
             "op": "login",