Fixed oauth error (#223)

files/routes/oauth.py

@@ -5,6 +5,7 @@ from files.helpers.const import *
 from files.classes import *
 from flask import *
 from files.__main__ import app, limiter
+import sqlalchemy.exc
 
 @app.get("/authorize")
 @auth_required
@@ -24,11 +25,15 @@ def authorize(v):
 	application = g.db.query(OauthApp).filter_by(client_id=client_id).one_or_none()
 	if not application: return {"oauth_error": "Invalid `client_id`"}, 401
 	access_token = secrets.token_urlsafe(128)[:128]
+
+	try:
 		new_auth = ClientAuth(oauth_client = application.id, user_id = v.id, access_token=access_token)
-
 		g.db.add(new_auth)
-
 		g.db.commit()
+	except sqlalchemy.exc.IntegrityError:
+		g.db.rollback()
+		old_auth = g.db.query(ClientAuth).filter_by(oauth_client = application.id, user_id = v.id).one()
+		access_token = old_auth.access_token
 
 	return redirect(f"{application.redirect_uri}?token={access_token}")