Per-User File Upload Quotas with Angular and Firebase Custom Auth Tokens

do-file-upload.ts

doFileUpload(uid, id, file) {
  return new Observable(subscriber => {
    const task = this.storage.upload(`${uid}/${id}`, file);
    task.snapshotChanges()
      .pipe(
        finalize(() => {
          subscriber.next({ done: true, id });
          subscriber.complete();
        })
      )
      .subscribe()
  });
}