Add Decrypt to all relevant pages

src/main/resources/static/js/download.js

@@ -0,0 +1,27 @@
+document.getElementById('download-pdf').addEventListener('click', async () => {
+  const modifiedPdf = await DraggableUtils.getOverlayedPdfDocument();
+  let decryptedFile = modifiedPdf;
+  let isEncrypted = false;
+  let requiresPassword = false;
+  await this.decryptFile
+    .checkFileEncrypted(decryptedFile)
+    .then((result) => {
+      isEncrypted = result.isEncrypted;
+      requiresPassword = result.requiresPassword;
+    })
+    .catch((error) => {
+      console.error(error);
+    });
+  if (decryptedFile.type === 'application/pdf' && isEncrypted) {
+    decryptedFile = await this.decryptFile.decryptFile(decryptedFile, requiresPassword);
+    if (!decryptedFile) {
+      throw new Error('File decryption failed.');
+    }
+  }
+  const modifiedPdfBytes = await modifiedPdf.save();
+  const blob = new Blob([modifiedPdfBytes], {type: 'application/pdf'});
+  const link = document.createElement('a');
+  link.href = URL.createObjectURL(blob);
+  link.download = originalFileName + '_signed.pdf';
+  link.click();
+});