如何使用JWT令牌对FireBase的网站用户进行身份验证？

Question

我正在构建一个使用Firebase的移动应用程序。登录时，我希望应用程序从我的网站数据库中对用户进行身份验证，然后将该信息复制到firebase数据库中。创建帐户后，它应先写入网站数据库，然后再写入firebase数据库。

现在，我感到有些泥泞，我不确定自己是否朝着正确的方向运动，或者我是否应该完全重新开始并从另一个角度接近这个方向。现在，以下错误使我难堪，我不知道此密钥应该从哪里来：

undefined
/home/ethreil/Desktop/codestudio/firebasesdk.js:40
    var signingKey = key.publicKey || key.rsaPublicKey;
                         ^

TypeError: Cannot read property 'publicKey' of undefined
    at /home/ethreil/Desktop/codestudio/firebasesdk.js:40:26
    at /home/ethreil/Desktop/codestudio/node_modules/lru-memoizer/index.js:81:20
    at Array.forEach (<anonymous>)
    at /home/ethreil/Desktop/codestudio/node_modules/lru-memoizer/index.js:77:17
    at /home/ethreil/Desktop/codestudio/node_modules/jwks-rsa/lib/wrappers/cache.js:22:18
    at /home/ethreil/Desktop/codestudio/node_modules/jwks-rsa/lib/JwksClient.js:51:18
    at /home/ethreil/Desktop/codestudio/node_modules/jwks-rsa/lib/JwksClient.js:104:18
    at Request._callback (/home/ethreil/Desktop/codestudio/node_modules/jwks-rsa/lib/JwksClient.js:88:20)
    at Request.self.callback (/home/ethreil/Desktop/codestudio/node_modules/request/request.js:185:22)

我的密码

var admin = require('firebase-admin');
var refreshToken; // Get refresh token from OAuth2 flow

var serviceAccount = require('/home/ethreil/Desktop/codestudio/ggbsdk.json');
var uid = "some-uid";


admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  databaseURL: 'https://goodgamebuzz.firebaseio.com'

});

var fs = require('fs');
var cert = fs.readFileSync('/home/ethreil/Desktop/codestudio/privateKey.pem');
var jwt = require('jsonwebtoken');

var token = jwt.sign({ 
  expiresIn: 36000 ,
  audience: "https://identitytoolkit.googleapis.com/google.identity.identitytoolkit.v1.IdentityToolkit" ,
  issuer: 'myserviceaccount@gmail.com' ,
  subject: 'myservicecaccount@gmail.com' ,
  iat: Math.floor(Date.now()) 
 } ,
 cert
  ,
 {
  algorithm: 'RS256' ,
  keyid: '7a3d1904f18e257948831eab803e12b7971e13ab' 
});

const kid = '7a3d1904f18e257948831eab803e12b7971e13ab';
var jwksClient = require('jwks-rsa');
var client = jwksClient({
  cache:true ,
  jwksUri: 'https://goodgamebuzz.com/wp-json/jwt-auth/v1/token/validate'
});

client.getSigningKey(kid, function(err, key) {
    var signingKey = key.publicKey || key.rsaPublicKey;
    callback(null, signingKey);
  });


jwt.verify(token, cert, {
   algorithms: 'RS256' ,
   audience: 'goodgamebuzz' ,
   issuer: "https://securetoken.google.com/goodgamebuzz" ,
   subject: uid 

} ,
  function(err, decoded) {
  console.log(decoded) // bar
});