Accelerate asset catalogue lookup based on policy permissions

[kkoutso]

Hello,
I have an installation with a few thousands assets. Each of the assets may exposed under certain conditions with a policy permission like:

            "odrl:permission": {
                "odrl:action": {
                    "odrl:type": "USE"
                },
                "odrl:constraint": {
                    "odrl:leftOperand": "REFERRING_CONNECTOR",
                    "odrl:operator": {
                        "@id": "odrl:eq"
                    },
                    "odrl:rightOperand": "{myid}:keyid:{myID}"
                }
            }

What shall the query spec be on the requesting side?

I am using:

{
    "@context": {
        "@vocab": "https://w3id.org/edc/v0.0.1/ns/"
    },
    "counterPartyAddress": "http://{poducer IP}:19194/protocol",
    "protocol": "dataspace-protocol-http",
    "querySpec": {
        "filterExpression": [
            {
                "operandLeft": "policy.refConnector",
                "operator": "=",
                "operandRight": "{myID}:keyid:{myID}"
            }
        ]
    }
}

but it does not seem to work and I am getting empty results back.

Thanks

[jimmarino]

Please read the documentation to understand how access and usage policies work and how catalogs are generated based on claims.

[ndr-brt]

the filterExpression is applied only to Asset properties.

Everything about how to set up the Policy Engine to evaluate policies is described in the documentation.

[kkoutso]

Thanks, yes I have realised this. The evaluation is done based on the policy restriction, however, it takes long time.
I do not know whether it is possible to narrow done the query as in the above concept.
The consuming side cares only about explicit permissions to it, that do not appear in the broker. So for the moment I modified the query statement to apply this logic.