Cắt PDF trong Node.js Cloud API

    import { PdfChangeLayoutHelper, pdfApi } from "./changeLayoutHelper.js";
    export { PdfCropPage };

    const PdfCropPage = {
        async cropPage(document, pageNumber, llx, lly, width, height, outputDocument, localFolder, tempFolder) {
            if ( pdfApi ) {
                await PdfChangeLayoutHelper.uploadDocument(document, localFolder, tempFolder);  

                var pageSie = await PdfChangeLayoutHelper.getPageInfo(document, pageNumber, tempFolder);

                const imageFile = await PdfChangeLayoutHelper.extractPdfPage(document, pageNumber, pageSie.width, pageSie.height, localFolder, tempFolder);
                const newPdf = await PdfChangeLayoutHelper.createPdfDocument(outputDocument, width, height, tempFolder);
                if (newPdf.body.code != 200) {
                    console.error("cropPage(): Failed to create new PDF document!");
                    return;
                }

                const response = await PdfChangeLayoutHelper.insertPageAsImage(outputDocument, imageFile, llx, lly, tempFolder);

                if (response.body.code == 200) {
                    console.log("cropPage(): Page successfully cropped.");
                    await PdfChangeLayoutHelper.downloadResult(outputDocument, localFolder, tempFolder, "cropped_")
                }
                else
                    console.error("cropPage(): Can't crop pdf document page!")
            }
        }
    }