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You need either extend the current API set or add new API itself using API extensions. You can look at extension provided in keystone
http://api.openstack.org/api-ref-identity.html#identity-v2-ext OR
https://www.ibm.com/developerworks/community/blogs/e93514d3-c4f0-4aa0-8844-497f370090f5/entry/openstack_nova_api?lang=en
I have not used any of these to write my own extensions.