Grant automatically if user has unrevoked token for specified client

auth.py

@@ -218,6 +218,12 @@ def save_token(token, request, *args, **kwargs):
 def authorize(*args, **kwargs):
     form = FlaskForm()
 
+    if Token.query.filter(
+            Token.client_id == kwargs.get('client_id'),
+            Token.user == current_user.username).count():
+        # User has unrevoked token already - grant by default
+        return True
+
     if not form.validate_on_submit():
         client_id = kwargs.get('client_id')
         client = Client.query.filter_by(client_id=client_id).first()