class.ilObjContainerDAV.php

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<?php

use Sabre\DAV;
use ILIAS\UI\NotImplementedException;
use Sabre\DAV\Exception;
use Sabre\DAV\Exception\NotFound;
use Sabre\DAV\Exception\NotImplemented;
use Sabre\DAV\Exception\Forbidden;

abstract class ilObjContainerDAV extends ilObjectDAV implements Sabre\DAV\ICollection
{
    public function __construct(ilContainer $a_obj, ilWebDAVRepositoryHelper $repo_helper, ilWebDAVObjDAVHelper $dav_helper)
    {
        parent::__construct($a_obj, $repo_helper, $dav_helper);
    }

    public function createFile($name, $data = null)
    {
        if ($this->repo_helper->checkCreateAccessForType($this->obj->getRefId(), 'file')) {
            $size = $this->request->getHeader("Content-Length")[0] ?? 0;
            if ($size > ilUtil::getUploadSizeLimitBytes()) {
                throw new Exception\Forbidden('File is too big');
            }

            // Check if file has valid extension
            if ($this->dav_helper->isValidFileNameWithValidFileExtension($name)) {
                if ($this->childExists($name)) {
                    $file_dav = $this->getChild($name);
                    return $file_dav->put($data);
                } else {
                    $file_obj = new ilObjFile();
                    $file_obj->setTitle($name);
                    $file_obj->setFileName($name);
                    $file_obj->setVersion(1);
                    $file_obj->setMaxVersion(1);
                    $file_obj->createDirectory();
                    $file_obj->create();

                    $file_obj->createReference();
                    $file_obj->putInTree($this->obj->getRefId());
                    $file_obj->setPermissions($this->ref_id);

                    $file_dav = new ilObjFileDAV($file_obj, $this->repo_helper, $this->dav_helper);
                    return $file_dav->handleFileUpload($data, "create");
                }
            } else {
                // Throw forbidden if invalid extension or filename. As far as we know, it is sadly not
                // possible to inform the user why his upload was "forbidden".
                throw new Forbidden('Invalid file name or file extension');
            }
        } else {
            throw new Forbidden('No write access');
        }
    }

    public function createDirectory($name)
    {
        global $DIC;

        $type = $this->getChildCollectionType();
        if ($this->repo_helper->checkCreateAccessForType($this->getRefId(), $type) && $this->dav_helper->isDAVableObjTitle($name)) {
            switch ($type) {
                case 'cat':
                    $new_obj = new ilObjCategory();
                    break;

                case 'fold':
                    $new_obj = new ilObjFolder();
                    break;

                default:
                    ilLoggerFactory::getLogger('WebDAV')->info(get_class($this) . ' ' . $this->obj->getTitle() . " -> $type is not supported as webdav directory");
                    throw new NotImplemented("Create type '$type' as collection is not implemented yet");
            }

            $new_obj->setType($type);
            $new_obj->setOwner($DIC->user()->getId());
            $new_obj->setTitle($name);
            $new_obj->create();

            $new_obj->createReference();
            $new_obj->putInTree($this->obj->getRefId());
            $new_obj->setPermissions($this->obj->getRefId());
            $new_obj->update();
        } else {
            throw new Forbidden();
        }
    }

    public function getChild($name)
    {
        $child_node = null;
        $child_exists = false;

        // Early exit if the problem info file is opened
        if ($name == ilProblemInfoFileDAV::PROBLEM_INFO_FILE_NAME) {
            return new ilProblemInfoFileDAV($this, $this->repo_helper, $this->dav_helper);
        }

        // Search for the desired file
        foreach ($this->repo_helper->getChildrenOfRefId($this->obj->getRefId()) as $child_ref) {
            // Check if a DAV Object exists for this type
            if ($this->dav_helper->isDAVableObject($child_ref, true)) {
                // Check if names matches
                if ($this->repo_helper->getObjectTitleFromRefId($child_ref, true) == $name) {
                    $child_exists = true;

                    // Check if user has permission to read this object
                    if ($this->checkReadAndVisibleAccessForObj($child_ref)) {
                        $child_node = $this->dav_helper->createDAVObjectForRefId($child_ref);
                    }
                }
            }
        }

        // There exists 1 or more nodes with this name. Return last found node.
        if (!is_null($child_node)) {
            return $child_node;
        }

        // There is no davable object with the same name. Sorry for you...
        throw new Sabre\DAV\Exception\NotFound("$name not found");
    }

    public function getChildren()
    {
        $child_nodes = array();
        $already_seen_titles = array();
        $problem_info_file_needed = false;

        foreach ($this->repo_helper->getChildrenOfRefId($this->obj->getRefId()) as $child_ref) {
            // Check if is davable object types
            if ($this->dav_helper->isDAVableObject($child_ref, true)) {
                // Check for duplicates
                $title = $this->repo_helper->getObjectTitleFromRefId($child_ref);
                if (in_array($title, $already_seen_titles)) {
                    $problem_info_file_needed = true;
                    continue;
                }

                $already_seen_titles[] = $title;

                // Check if read permission is given
                if ($this->checkReadAndVisibleAccessForObj($child_ref)) {
                    // Create DAV-object out of ILIAS-object
                    $child_nodes[$child_ref] = $this->dav_helper->createDAVObjectForRefId($child_ref);
                }
            }
            // if title is not davable because of forbidden characters in title -> problem info file will be created
            elseif (!$problem_info_file_needed
                && $this->dav_helper->isDAVableObjType($this->repo_helper->getObjectTypeFromRefId($child_ref))
                && $this->dav_helper->hasTitleForbiddenChars($this->repo_helper->getObjectTitleFromRefId($child_ref))) {
                $problem_info_file_needed = true;
            }
        }

        if ($problem_info_file_needed) {
            $child_nodes[] = new ilProblemInfoFileDAV($this, $this->repo_helper, $this->dav_helper);
        }

        return $child_nodes;
    }

    public function childExists($name)
    {
        foreach ($this->repo_helper->getChildrenOfRefId($this->obj->getRefId()) as $child_ref) {
            // Only davable object types
            if ($this->dav_helper->isDAVableObject($child_ref, true)) {
                // Check if names are the same
                if ($this->repo_helper->getObjectTitleFromRefId($child_ref, true) == $name) {
                    // Check if read permission is given
                    if ($this->checkReadAndVisibleAccessForObj($child_ref)) {
                        return true;
                    } else {
                        /*
                         * This is an interesting edge case. What happens if there are 2 objects with the same name
                         * but User1 only has access to the first and user2 has only access to the second?
                         */
                        return false;
                    }
                }
            }
        }

        return false;
    }

    protected function checkReadAndVisibleAccessForObj($child_ref)
    {
        return $this->repo_helper->checkAccess("visible", $child_ref) && $this->repo_helper->checkAccess("read", $child_ref);
    }

    abstract public function getChildCollectionType();
}