private static Optional<Policy> getDefaultPolicy(final AuthorizationContext authorizationContext, final CharSequence thingId) { final Optional<Subject> subjectOptional = authorizationContext.getFirstAuthorizationSubject() .map(AuthorizationSubject::getId) .map(SubjectId::newInstance) .map(Subject::newInstance); return subjectOptional.map(subject -> Policy.newBuilder(thingId) .forLabel(DEFAULT_POLICY_ENTRY_LABEL) .setSubject(subject) .setGrantedPermissions(PoliciesResourceType.thingResource("/"), org.eclipse.ditto.services.models.things.Permission.DEFAULT_THING_PERMISSIONS) .setGrantedPermissions(PoliciesResourceType.policyResource("/"), org.eclipse.ditto.services.models.policies.Permission.DEFAULT_POLICY_PERMISSIONS) .setGrantedPermissions(PoliciesResourceType.messageResource("/"), org.eclipse.ditto.services.models.policies.Permission.DEFAULT_POLICY_PERMISSIONS) .build()); }