file download is added

projects/ucap-webmessenger-core/src/lib/utils/file.util.ts

@@ -56,6 +56,19 @@ export class FileUtil {
     });
   }
 
+  static downloadFromBlob(blob: Blob, fileName: string) {
+    const a = document.createElement('a');
+    document.body.appendChild(a);
+    a.style.display = 'none';
+
+    const url = URL.createObjectURL(blob);
+    a.href = url;
+    a.download = fileName;
+    a.click();
+    window.URL.revokeObjectURL(url);
+    a.remove();
+  }
+
   static thumbnail(file: File): Promise<File> {
     return new Promise<File>((resolve, reject) => {
       const fileReader = new FileReader();