Facebook：如何使用python获取/更新用户访问令牌？

Question

Currently am using Graph Explorer to get a short-lived user access token and than converting it to a extended token(60 days) by a call to facepy get_extended_access_token method.

Now. consider the scenario where my user access token becomes invalid because of either user logging out or the token expires itself. So, in both the cases I need to get a new user access token because get_extended_access_token requires access_token so that it can extend it.

So, my question is how to retrieve this token using python? Is there any particular url which I can send a request and it will return a new/updated token in resonse.

Update :

So, after following this post and making a request to

https://graph.facebook.com/oauth/access_token?client_id=xxxx&client_secret=yyyy&grant_type=client_credentials

I got this token which I believe is an app access token

access_token=123456789|12abcdef234 #changed from original

But what I need is an user access token through which I can read my mailbox.

Answer 1

If the access token has expired or been invalidated you need to go back through the Auth Dialog, ie a user must manually re-grant access to your application. Retrieving it programmatically defeats the whole purpose of token invalidation/expiry.

Once you get this token, you can then use get_extended_access_token to get the long lived one

App tokens can be used to publish a post on the user's behalf.