More details on this enhancement.

Goal: Make sure you get an access token for the right user in immediate
mode.

Use case where we have problems if we don't have username parameter:

   1. Bob is logged into a web site as b...@idp.com.
   2. Mary (his wife) is logged into IDP on the same computer as
   m...@idp.com
   3. A request is made to get an access token via the User-Agent flow in
   immediate mode (or with any redirect without prompting the user)
   4. -ob now has an access token for Mary and (posts activities, schedules
   events, gets contacts) as Mary
   5. Hilarity ensues


Secondary goal: Provide a hint for non-immediate mode

On Thu, Apr 15, 2010 at 11:55 AM, Eran Hammer-Lahav <e...@hueniverse.com>wrote:

> Evan Gilbert proposed a 'username' request parameter to allow the client to
> limit the end user to authenticate using the provided authorization server
> identifier. The proposal has not been discussed or supported by others, and
> has not received a security review.
>
> Proposal: Obtain further discussion and support from others, as well as a
> security review of the proposal. Otherwise, do nothing.
>
> EHL
>
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> https://www.ietf.org/mailman/listinfo/oauth
>
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