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<?php
namespace JsonApi\Routes\Courseware;
use Courseware\StructuralElement;
use Courseware\PublicLink;
use JsonApi\Errors\AuthorizationFailedException;
use JsonApi\Errors\RecordNotFoundException;
use JsonApi\JsonApiController;
use Neomerx\JsonApi\Contracts\Http\ResponsesInterface;
use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
/**
* Displays all descendants of a structural element.
*/
class DescendantsOfPublicStructuralElementsIndex extends JsonApiController
{
protected $allowedPagingParameters = ['offset', 'limit'];
protected $allowedIncludePaths = ['containers', 'parent'];
/**
* @SuppressWarnings(PHPMD.UnusedFormalParameter)
*/
public function __invoke(Request $request, Response $response, $args)
{
/** @var ?StructuralElement $resource */
$resource = StructuralElement::find($args['id']);
$publicLink = PublicLink::find($args['link_id']);
if (!$publicLink) {
throw new RecordNotFoundException();
}
if (!$resource) {
throw new RecordNotFoundException();
}
if (!$publicLink->canVisitElement($resource)) {
throw new AuthorizationFailedException();
}
$descendants = $resource->findDescendants();
[$offset, $limit] = $this->getOffsetAndLimit();
$page = array_slice($descendants, $offset, $limit);
$total = count($descendants);
return $this->getPaginatedContentResponse(
$page,
$total
);
}
}
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