云存储功能：如何获取下载网址？

Question

在云端功能中，如何获取存储文件的download-url？

public static void Main(string[] args)
{
    // NLog: setup the logger first to catch all errors
    var logger = NLog.Web.NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger();
    try
    {
        logger.Debug("init main");
        BuildWebHost(args).Run(); 
    }
    catch (Exception ex)
    {
        //NLog: catch setup errors
        logger.Error(ex, "Stopped program because of exception");
        throw;
    }
    finally
    {
        // Ensure to flush and stop internal timers/threads before application-exit (Avoid segmentation fault on Linux)
        NLog.LogManager.Shutdown();
    }
}

使用此存储对象，我可以执行const functions = require('firebase-functions'); const admin = require('firebase-admin'); admin.initializeApp(functions.config().firebase); const storage = admin.storage(); ，但返回的元数据不包含firebase-signed-download-url。

The docs说创建引用并执行storage.bucket().file(path).getMetadata()。唯一的问题是，这似乎不适用于从firebase-admin软件包返回的存储对象。