Pimcore version

12.2.2

Steps to reproduce

Configure Pimcore to save files through flysystem to S3 or GCS.
Run bin/console pimcore:assets:add-to-update-task-queue to generate the document previews.

Inspect the logs of the worker, you'll find: pimcore.ERROR: Gotenberg\Exceptions\GotenbergApiErrored: Invalid form data: no form file found for extensions: [.123 .602 .abw .bib .bmp .cdr .cgm .cmx .csv .cwk .dbf .dif .doc .docm .docx .dot .dotm .dotx .dxf .emf .eps .epub .fodg .fodp .fods .fodt .fopd .gif .htm .html .hwp .jpeg .jpg .key .ltx .lwp .mcw .met .mml .mw .numbers .odd .odg .odm .odp .ods .odt .otg .oth .otp .ots .ott .pages .pbm .pcd .pct .pcx .pdb .pdf .pgm .png .pot .potm .potx .ppm .pps .ppt .pptm .pptx .psd .psw .pub .pwp .pxl .ras .rtf .sda .sdc .sdd .sdp .sdw .sgl .slk .smf .stc .std .sti .stw .svg .svm .swf .sxc .sxd .sxg .sxi .sxm .sxw .tga .tif .tiff .txt .uof .uop .uos .uot .vdx .vor .vsd .vsdm .vsdx .wb2 .wk1 .wks .wmf .wpd .wpg .wps .xbm .xhtml .xls .xlsb .xlsm .xlsx .xlt .xltm .xltx .xlw .xml .xpm .zabw]

The reason is that the file located on S3 is downloaded in the var/tmp folder as .tmp file and passed to Gotenberg with the .tmp extension. As Gotenberg checks the file extension, the file is refused as .tmp is not supported.

A quick and dirty hack in lib/Document/Adapter/Gotenberg.php solves the issue:

            // ---- QUICK & DIRTY DEBUG HACK ----
            $originalFilename = $asset->getFilename();
            $ext = pathinfo($originalFilename, PATHINFO_EXTENSION);

            // Fallback if something weird happens
            if (!$ext) {
                $ext = 'docx';
            }

            $localAssetTmpPathWithExt = $localAssetTmpPath . '.' . $ext;

            // Copy temp file to same location with correct extension
            if (!file_exists($localAssetTmpPathWithExt)) {
                copy($localAssetTmpPath, $localAssetTmpPathWithExt);
            }

            // Use the new path for Gotenberg
            $localAssetTmpPath = $localAssetTmpPathWithExt;
            // ---------------------------------

Actual Behavior

DOCX document previews not generated.

Expected Behavior

DOCX document previews generated.