eZ\Publish\Core\Repository\RoleService::addPolicy PHP Method

    public function addPolicy(APIRole $role, APIPolicyCreateStruct $policyCreateStruct)
    {
        if (!is_string($policyCreateStruct->module) || empty($policyCreateStruct->module)) {
            throw new InvalidArgumentValue('module', $policyCreateStruct->module, 'PolicyCreateStruct');
        }
        if (!is_string($policyCreateStruct->function) || empty($policyCreateStruct->function)) {
            throw new InvalidArgumentValue('function', $policyCreateStruct->function, 'PolicyCreateStruct');
        }
        if ($policyCreateStruct->module === '*' && $policyCreateStruct->function !== '*') {
            throw new InvalidArgumentValue('module', $policyCreateStruct->module, 'PolicyCreateStruct');
        }
        if ($this->repository->hasAccess('role', 'update') !== true) {
            throw new UnauthorizedException('role', 'update');
        }
        $loadedRole = $this->loadRole($role->id);
        $limitations = $policyCreateStruct->getLimitations();
        $limitationValidationErrors = $this->validatePolicy($policyCreateStruct->module, $policyCreateStruct->function, $limitations);
        if (!empty($limitationValidationErrors)) {
            throw new LimitationValidationException($limitationValidationErrors);
        }
        $spiPolicy = $this->roleDomainMapper->buildPersistencePolicyObject($policyCreateStruct->module, $policyCreateStruct->function, $limitations);
        $this->repository->beginTransaction();
        try {
            $this->userHandler->addPolicy($loadedRole->id, $spiPolicy);
            $this->repository->commit();
        } catch (Exception $e) {
            $this->repository->rollback();
            throw $e;
        }
        return $this->loadRole($loadedRole->id);
    }