From ca8d98ab2e5277e53ab8df78beb1e75cdf5321e3 Mon Sep 17 00:00:00 2001
From: Aniruddha Maru <aniruddhamaru@gmail.com>
Date: Fri, 15 May 2020 14:52:50 -0700
Subject: [PATCH] fix: signBytes for impersonated credentials (#506)

* fix: signBytes doesn't work for impersonated credentials

Fixes #338

* black
---
 google/auth/impersonated_credentials.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/google/auth/impersonated_credentials.py b/google/auth/impersonated_credentials.py
index 84df484a4..429980210 100644
--- 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"}