Control Plane does not asset target value when opening Contract Negotiation

[bscholtes1A]

Bug Report

Describe the Bug

When consumer initiates a contract negotiation, the control plane does not check if the content of the target field (which should contain the asset id) is equal to the asset id defined in the asset id portion of the policy @id.

In fact, the content of this target field is not even used, and

Expected Behavior

Control Plane should enforce that the content of the target field contains the same asset id as the one defined in the asset id portion of the policy @id, and return a validation error if it's not the case.

Steps to Reproduce

Initiate a contract negotiation through the control plane management API, and use a random put a random string in the target field of the request.

[ndr-brt]

please note that the structure of the ContractOfferId (containing the assetId), is something EDC-related and used by the EDC provider to apply contract validations (see ContractValidationServiceImpl), but there could be a not-EDC-provider, in that case the ContractOfferId structure could be anything, so the consumer should not validate anything, is the provider that needs to do it (and it does already).

TL;DR: EDC provider in fact ignore the target attribute of the Offer because the @id already gives all the information needed