class.ilFilePreviewRenderer.php

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<?php
/* Copyright (c) 1998-2012 ILIAS open source, Extended GPL, see docs/LICENSE */

include_once("./Services/Preview/classes/class.ilPreviewRenderer.php");

abstract class ilFilePreviewRenderer extends ilPreviewRenderer
{
    final public function getSupportedRepositoryTypes()
    {
        return array("file");
    }

    public function supports($preview)
    {
        // let parent check first
        if (!parent::supports($preview)) {
            return false;
        }

        // get file extension
        require_once("./Modules/File/classes/class.ilObjFile.php");
        include_once './Modules/File/classes/class.ilObjFileAccess.php';
        // bugfix mantis 23293
        if (isset($_FILES['file']['name'])) {
            $filename = $_FILES['file']['name'];
        } elseif (isset($_FILES['upload_files']['name'])) {
            $filename = $_FILES['upload_files']['name'];
        } elseif ($obj_id = $preview->getObjId()) {
            $file_data = ilObjFileAccess::_lookupFileData($obj_id);
            $filename = $file_data['file_name'] ?? '';
        }

        $ext = ilObjFileAccess::_getFileExtension($filename);

        // contains that extension?
        return in_array($ext, $this->getSupportedFileFormats());
    }

    public function prepareFileForExec($filepath)
    {
        $filepath = ilFileUtils::getValidFilename($filepath);

        $pos = strrpos($filepath, "/");
        $name = $pos !== false ? substr($filepath, $pos + 1) : $filepath;

        // if the file path contains any characters that could cause problems
        // we copy the file to a temporary file
        // $normName = preg_replace("/[^A-Za-z0-9.\- +_&]/", "", $name);
        // if ($normName != $name)
        // {
        //      $tempPath = ilUtil::ilTempnam();
        //      if (copy($filepath, $tempPath))
        //              return $tempPath;
        // }
        //
        return $filepath;
    }

    abstract public function getSupportedFileFormats();
}