Firebase getSignedUrl()的签名错误

我想用 file.getSignedUrl() 通过谷歌云功能(Nodejs)从Firebase存储获取下载URL。我在云功能控制台中遇到此错误:

{ SigningError: A Forbidden error was returned while attempting to retrieve an access token for the Compute Engine built-in service account. This may be because the Compute Engine instance does not have the correct permission scopes specified. Permission iam.serviceAccounts.signBlob is required to perform this operation on service account projects/myapp-cd94d/serviceAccounts/myapp-cd94d@appspot.gserviceaccount.com.
    at SigningError (/user_code/node_modules/@google-cloud/storage/build/src/file.js:58:9)
    at authClient.sign.then.catch.err (/user_code/node_modules/@google-cloud/storage/build/src/file.js:1019:22)
    at process._tickDomainCallback (internal/process/next_tick.js:135:7) name: 'SigningError' }

Add the Firebase Admin SDK to Your Server serviceAccountKey.json 在我的 functions firebase deploy 不是给了我错误吗

Error parsing triggers: Cannot find module 'serviceAccountKey.json'

因此,我必须有正确的道路,以我的 serviceAccountKey.json firebase-admin 6.1.0 和 firebase-tools 6.1.0

const admin = require('firebase-admin');
var serviceAccount = require("./myapp-cd94d-firebase-adminsdk-1234x-sEcReT.json");

admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  databaseURL: "https://myapp-cd94d.firebaseio.com"
});

...

const config = {
  action: 'read',
    expires: '03-17-2025'
  };

file.getSignedUrl(config).then(function(data) {
    const url = data[0];
    console.log(url);
  })
  .catch(function(error) {
    console.error(error);
  })

Doug Stevenson's answer 具有不同的代码,但似乎与文档中的代码相同。