我试图了解如何使用Node.js在Firebase Storage中上传文件。我的第一次尝试是使用Firebase库：

"use strict";

var firebase = require('firebase');

var config = {
    apiKey: "AIz...kBY",
    authDomain: "em....firebaseapp.com",
    databaseURL: "https://em....firebaseio.com",
    storageBucket: "em....appspot.com",
    messagingSenderId: "95...6"
};

firebase.initializeApp(config);

// Error: firebase.storage is undefined, so not a function
var storageRef = firebase.storage().ref();

var uploadTask = storageRef.child('images/octofez.png').put(file);

// Register three observers:
// 1. 'state_changed' observer, called any time the state changes
// 2. Error observer, called on failure
// 3. Completion observer, called on successful completion
uploadTask.on('state_changed', function(snapshot){
    ...
}, function(error) {
    console.error("Something nasty happened", error);
}, function() {
  var downloadURL = uploadTask.snapshot.downloadURL;
  console.log("Done. Enjoy.", downloadURL);
});

但是事实证明，Firebase无法从服务器端上传文件，正如在文档中明确指出的那样：

Firebase存储不包含在服务器端Firebase npm模块中。相反，您可以使用gcloud Node.js客户端。

$ npm install --save gcloud

在代码中，您可以使用以下方式访问存储分区：

var gcloud = require('gcloud')({ ... }); var gcs = gcloud.storage();
var bucket = gcs.bucket('<your-firebase-storage-bucket>');

• 我们可以在gcloud没有Google Cloud Platform帐户的情况下使用吗？怎么样？

• 如果没有，怎么可能从客户端将文件上传到Firebase Storage？

• 我们不能只创建一个从服务器端发出相同请求的库吗？

• Firebase Storage到底如何与Google Cloud Platform连接？为什么Firebase允许我们仅从客户端上传图像？

我的第二次尝试是使用gcloud库，如文档中所述：

var gcloud = require("gcloud");

// The following environment variables are set by app.yaml when running on GAE,
// but will need to be manually set when running locally.
// The storage client is used to communicate with Google Cloud Storage
var storage = gcloud.storage({
  projectId: "em...",
  keyFilename: 'auth.json'
});

storage.createBucket('octocats', function(err, bucket) {

    // Error: 403, accountDisabled
    // The account for the specified project has been disabled.

    // Create a new blob in the bucket and upload the file data.
    var blob = bucket.file("octofez.png");
    var blobStream = blob.createWriteStream();

    blobStream.on('error', function (err) {
        console.error(err);
    });

    blobStream.on('finish', function () {
        var publicUrl = `https://storage.googleapis.com/${bucket.name}/${blob.name}`;
        console.log(publicUrl);
    });

    fs.createReadStream("octofez.png").pipe(blobStream);
});