class.ilWebDAVLockUriPathResolver.php

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<?php

declare(strict_types=1);

use Sabre\DAV\Exception\BadRequest;
use Sabre\DAV\Exception\NotFound;

class ilWebDAVLockUriPathResolver
{
    protected ilWebDAVRepositoryHelper $webdav_repository_helper;

    public function __construct(ilWebDAVRepositoryHelper $webdav_repository_helper)
    {
        $this->webdav_repository_helper = $webdav_repository_helper;
    }

    public function getRefIdForWebDAVPath(string $uri): int
    {
        $uri = trim($uri, '/');

        $split_path = explode('/', $uri, 2);

        if (!isset($split_path[0])
            || $split_path[0] === ''
            || $split_path[0] !== CLIENT_ID) {
            throw new BadRequest('Invalid client id given');
        }

        $path_inside_of_mountpoint = isset($split_path[1]) ? $split_path[1] : '';
        $mountpoint = '';

        if ($path_inside_of_mountpoint !== ''
            && substr($path_inside_of_mountpoint, 0, 4) === 'ref_') {
            $split_path = explode('/', $path_inside_of_mountpoint, 2);
            $mountpoint = $split_path[0];
            $path_inside_of_mountpoint = isset($split_path[1]) ? $split_path[1] : '';
        }

        if ($mountpoint !== '') {
            return $this->getRefIdFromPathInRefMount($mountpoint, $path_inside_of_mountpoint);
        }

        return $this->getRefIdFromPathInRepositoryMount($path_inside_of_mountpoint);
    }

    protected function getRefIdFromPathInRepositoryMount(string $path_inside_of_mountpoint): int
    {
        if ($path_inside_of_mountpoint === '') {
            return ROOT_FOLDER_ID;
        }

        return $this->getRefIdFromGivenParentRefAndTitlePath(ROOT_FOLDER_ID, explode('/', $path_inside_of_mountpoint));
    }

    protected function getRefIdFromPathInRefMount(string $repository_mountpoint, string $path_inside_of_mountpoint): int
    {
        $relative_mountpoint_ref_id = (int) explode('_', $repository_mountpoint)[1];

        if ($relative_mountpoint_ref_id < 1) {
            throw new NotFound('Mount point not found');
        }

        if ($path_inside_of_mountpoint === '') {
            return $relative_mountpoint_ref_id;
        }

        return $this->getRefIdFromGivenParentRefAndTitlePath($relative_mountpoint_ref_id, explode('/', $path_inside_of_mountpoint));
    }

    protected function getRefIdFromGivenParentRefAndTitlePath(int $a_parent_ref, array $current_path_array): int
    {
        $current_ref_id = $a_parent_ref;
        while (count($current_path_array) >= 1) {
            $next_searched_title = array_shift($current_path_array);
            if ($next_searched_title !== '') {
                try {
                    $current_ref_id = $this->getChildRefIdByGivenTitle($current_ref_id, $next_searched_title);
                } catch (NotFound $e) {
                    if (count($current_path_array) === 0) {
                        /* This is a really special case. It occurs, if the lock is meant for an object that does not
                           exist yet (so called NullRessources) since we can't and won't lock non existing objects, we
                           set the Exception code to -1. The receiving class SHOULD handle what to do with this value */
                        throw new NotFound('Last node not found', -1);
                    }

                    throw new NotFound('Node not found', 0);
                }
            }
        }
        return $current_ref_id;
    }

    protected function getChildRefIdByGivenTitle(int $a_parent_ref_id, string $a_searched_title): int
    {
        $ref_to_return = null;

        foreach ($this->webdav_repository_helper->getChildrenOfRefId($a_parent_ref_id) as $child_ref) {
            $child_title = $this->webdav_repository_helper->getObjectTitleFromRefId($child_ref, true);
            if ($a_searched_title === $child_title) {
                $ref_to_return = $child_ref;
            }
        }

        if (!is_null($ref_to_return)) {
            return $ref_to_return;
        }

        throw new NotFound('Node not found');
    }
}