From 414cdf7c387335c0650008f01fd54e706b1b402e Mon Sep 17 00:00:00 2001
From: Matt Black <github@mafro.net>
Date: Mon, 8 Jul 2024 14:46:12 +1000
Subject: [PATCH] Raise an exception when the oauth flow fails

---
 gcsa/_services/authentication.py | 5 +++++
 gcsa/exceptions.py               | 2 ++
 2 files changed, 7 insertions(+)
 create mode 100644 gcsa/exceptions.py

diff --git a/gcsa/_services/authentication.py b/gcsa/_services/authentication.py
index 27dd00b..b43c15d 100644
--- a/gcsa/_services/authentication.py
+++ b/gcsa/_services/authentication.py
@@ -9,6 +9,8 @@
 from google.auth.transport.requests import Request
 from google.auth.credentials import Credentials
 
+from gcsa.exceptions import FailedToAuthenticateError
+
 
 class AuthenticatedService:
     """Handles authentication of the `GoogleCalendar`"""
@@ -123,6 +125,9 @@ def _get_credentials(
                 except WSGITimeout:
                     print('Authentication flow timed out. Please try again.')
 
+            if credentials is None:
+                raise FailedToAuthenticateError
+
             if save_token:
                 with open(token_path, 'wb') as token_file:
                     pickle.dump(credentials, token_file)
diff --git a/gcsa/exceptions.py b/gcsa/exceptions.py
new file mode 100644
index 0000000..1e9675a
--- /dev/null
+++ b/gcsa/exceptions.py
@@ -0,0 +1,2 @@
+class FailedToAuthenticateError(Exception):
+    pass