fix: signBytes for impersonated credentials (#506)

* fix: signBytes doesn't work for impersonated credentials Fixes #338 * black
googleapis · May 15, 2020 · ca8d98a · ca8d98a
1 parent 9dc9e9f
commit ca8d98a
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/google/auth/impersonated_credentials.py b/google/auth/impersonated_credentials.py
@@ -264,7 +264,10 @@ def sign_bytes(self, message):
 
         iam_sign_endpoint = _IAM_SIGN_ENDPOINT.format(self._target_principal)
 
-        body = {"payload": base64.b64encode(message), "delegates": self._delegates}
+        body = {
+            "payload": base64.b64encode(message).decode("utf-8"),
+            "delegates": self._delegates,
+        }
 
         headers = {"Content-Type": "application/json"}