refactor: download function to be reusable

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

@@ -0,0 +1,37 @@
+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',
+    });
+  }
+};