@Override
    public Map<String, List<Object>> getAttributesInternal(final RegisteredServiceAttributeReleasePolicyContext context,
                                                           final Map<String, List<Object>> attrs) {
        return authorizeReleaseOfAllowedAttributes(context, attrs);
    }
Return only the collection of allowed attributes out of what's resolved
for the principal.

@author Misagh Moayyed
@since 4.1.0
core/cas-server-core-authentication-attributes/src/main/java/org/apereo/cas/services/ReturnEncryptedAttributeReleasePolicy.java