Get All Domain users in Google App Engine

I want to get the list of all the users for the domain on a GAE app (using python). When I hit this URL https://apps-apis.google.com/a/feeds/domain/user/2.0 . I get an au开发者_如何学Gothorization error. How can I authenticate for this GET hit.

You'll need to use the Provisioning API, and you'll need to authenticate via OAuth first

To expand on the answer from Chris, prepare for a bit of pain around authentication. You have four options for read-only access, and one if you need read/write:

Marketplace authorization: if your app is on the Google Marketplace and a domain admin added you to the domain, you can use your app's Google Marketplace keys to access the provisioning API in read-only mode.

Domain OAuth: if you can get the domain admin to make a configuration change for you, your app can use the domain-wide OAuth keys for read-only access.

3-legged OAuth: if you are dealing with a superadmin user, you can request that they grant you temporary right to access the API in read-only mode.

Programmatic Login: lastly, you can ask them to give you an admin account username and password to login into the provisioning API. This is the only mechanism that will give you the ability to change anything.