class.ilFilePreviewRenderer.php

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<?php
abstract class ilFilePreviewRenderer extends ilPreviewRenderer
{
    final public function getSupportedRepositoryTypes(): array
    {
        return ["file"];
    }
 
    public function supports(\ilPreview $preview): bool
    {
        // let parent check first
        if (!parent::supports($preview)) {
            return false;
        }
 
        // legacy
        if (null === $preview->getObjId()) {
            // bugfix mantis 23293
            if (isset($_FILES['file']['name'])) {
                $filename = $_FILES['file']['name'];
            } elseif (isset($_FILES['upload_files']['name'])) {
                $filename = $_FILES['upload_files']['name'];
            }
            if (empty($filename)) {
                return false;
            }
 
            // contains that extension?
            $ext = ilObjFileAccess::_getFileExtension($filename);
            return in_array($ext, $this->getSupportedFileFormats(), true);
        }
 
        try {
            $obj = new ilObjFile($preview->getObjId(), false);
        } catch (Exception $e) {
            return false;
        }
 
        if (empty($obj->getResourceId())) {
            return false;
        }
 
        return in_array($obj->getFileExtension(), $this->getSupportedFileFormats(), true);
    }
 
    public function prepareFileForExec(string $filepath): string
    {
        $filepath = ilFileUtils::getValidFilename($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(): array;
}