Get access control list
-----------------------

Endpoint:

	https://auth.iudx.org.in/auth/v1/acl

Description:

	This API is used to get previously set access control policies.

Called by:

	A "data provider" with a valid class-3 or above certificate.

Methods:

	POST

HTTP response code:

	200
		If the policy has been successfully retrieved.

	400
		If no policies have been set yet.

Using pyIUDX SDK:

	from pyIUDX.auth import auth

	iudx_auth = auth.Auth("certificate.pem","private-key.pem")

	iudx_auth.get_policy()

CURL example:

	Request:

		curl -XPOST https://auth.iudx.org.in/auth/v1/acl --cert certificate.pem --key private-key.pem

	Response:

		200 OK
		content-type : "application/json"

		{
			"policy"		: [
				"*@iisc.ac.in can access rs1.com/my-resource-name for 3 hours",
				"arun@iisc.ac.in can access *.com/rs1 if tokens_per_day < 100"
			]

			"previous-policy"	: [],

			"last-updated"		: "2020-04-20T03:35:14.572Z"
		}

See also:

	acl set API:
		http://auth.iudx.org.in/acl-set.html

	acl append API:
		http://auth.iudx.org.in/acl-append.html

	node aperture at github:
		https://github.com/rbccps-iisc/node-aperture