documenso/packages/lib/client-only/download-pdf.ts

import type { DocumentData } from '@documenso/prisma/client';
import { toast } from '@documenso/ui/primitives/use-toast';

import { getFile } from '../universal/upload/get-file';

type DownloadPDFProps = {
  documentData: DocumentData;
  fileName?: string;
};

export const downloadFile = async ({ documentData, fileName }: DownloadPDFProps) => {
  try {
    const bytes = await getFile(documentData);

    const blob = new Blob([bytes], {
      type: 'application/pdf',
    });

    const link = window.document.createElement('a');
    const baseTitle = fileName?.includes('.pdf') ? fileName.split('.pdf')[0] : fileName;

    link.href = window.URL.createObjectURL(blob);
    link.download = baseTitle ? `${baseTitle}_signed.pdf` : 'document.pdf';

    link.click();

    window.URL.revokeObjectURL(link.href);
  } catch (err) {
    console.error(err);

    toast({
      title: 'Something went wrong',
      description: 'An error occurred while downloading your document.',
      variant: 'destructive',
    });
  }
};