Authorization code must be short lived and single use #3
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According to specs, access grants must be short lived and single use. This means tha after the access token is issued for a specific grant, the grant must be revoked and cannot be used again.
http://tools.ietf.org/html/draft-ietf-oauth-v2-22#section-10.5
This commit upgrades all migration files adding 'revoked_at' field and changes the behavior of #accessible?. For a grant be accessible it needs to not be either exipired or revoked.
The error response when the grant is revoked is 'invalid_grant' as specified here:
http://tools.ietf.org/html/draft-ietf-oauth-v2-22#section-5.2
I also had to fix an issue when creating the access token, that was issued to the wrong client attribute (uid instead of id)