Reddit: use expires_in from the response to calculate token expiration

1 files changed, 3 insertions, 2 deletions

diff --git a/bot/cogs/reddit.py b/bot/cogs/reddit.py
index 111f3b8ab..083f90573 100644
--- a/bot/cogs/reddit.py
+++ b/bot/cogs/reddit.py
@@ -56,7 +56,7 @@ class Reddit(Cog):
         return self.bot.get_channel(Channels.reddit)
 
     async def get_access_token(self) -> None:
-        """Get Reddit access tokens."""
+        """Get a Reddit API OAuth2 access token."""
         headers = {"User-Agent": self.USER_AGENT}
         data = {
             "grant_type": "client_credentials",
@@ -72,10 +72,11 @@ class Reddit(Cog):
             )
             if response.status == 200 and response.content_type == "application/json":
                 content = await response.json()
+                expiration = int(content["expires_in"]) - 60  # Subtract 1 minute for leeway.
                 AccessToken = namedtuple("AccessToken", ["token", "expires_at"])
                 self.access_token = AccessToken(
                     token=content["access_token"],
-                    expires_at=datetime.utcnow() + timedelta(hours=1)
+                    expires_at=datetime.utcnow() + timedelta(seconds=expiration)
                 )
                 self.headers = {
                     "Authorization": "bearer " + self.access_token.token,