在 firebase 函数中使用 gmail 时出现 Nodemailer 错误

我正在使用 firebase 云功能。我配置了以下设置。虽然这在我的本地计算机上运行得很好，但在服务器上运行时却给我带来了问题。我在互联网上尝试了无数的解决方法，但没有运气。这有什么问题吗？

'use strict'
const functions = require('firebase-functions');
var admin = require('firebase-admin');
const express = require('express');
const nodemailer = require('nodemailer');
const app = express()

var emailRecepient;
var userName;


const smtpTransport = nodemailer.createTransport({
service: "gmail",
host: 'smtp.gmail.com',
port: 587, // tried enabling and disabling these, but no luck
secure: false, // similar as above
auth: {
  user: '<emailid>',
  pass: '<password>'
    },
        tls: {
        rejectUnauthorized: false
    }
});

var mailOptions = {
  from: 'test <[email protected] /cdn-cgi/l/email-protection>',
  to: emailRecepient,
  subject: 'Welcome to test',
  text: 'welcome ' + userName + ". did you see the new things?"
};

function sendmail() {
smtpTransport.sendMail(mailOptions, function (error, info) {
    if (error) {
        console.log(error);
    }
    else {
        console.log('Email sent: ' + info.response);
    }
});
};

exports.sendEmails = functions.database.ref('/users/{userID}/credentials').onCreate((snap, context) => {

  const userID = context.params.userID;
  const vals = snap.val()

  userName = vals.name;
  emailRecepient = vals.email;

  smtpTransport.sendMail(mailOptions, function (error, info) {
  if (error) {
      console.log("Error sending email ---- ",error);
  }
  else {
      console.log('Email sent: ' + info.response);
  }
  });

  return true;

});

我在所有情况下遇到的错误是：

        Error sending email 2 ----  { Error: Invalid login: 534-5.7.14 <https://accounts.google.com/signin/continue?sarp=1&scc=1&plt=AKgnsbsi
    534-5.7.14 qRQLfD9YlFZDsPj7b8QQACro9c41PjhSVo0NZ4i5ZHNlyycFi_FyRp8VdZ_dH5ffWWAABQ
    534-5.7.14 8rH2VcXkyZBFu00-YHJUQNOqL-IqxEsZqbFCwCgk4-bo1ZeDaKTdkEPhwMeIM2geChH8av
    534-5.7.14 0suN293poXFBAk3TzqKMMI34zCvrZlDio-E6JVmTrxyQ-Vn9Ji26LaojCvdm9Bq_4anc4U
    534-5.7.14 SpQrTnR57GNvB0vRX1BihDqKuKiXBJ5bfozV1D1euQq18PZK2m> Please log in via
    534-5.7.14 your web browser and then try again.
    534-5.7.14  Learn more at
    534 5.7.14  https://support.google.com/mail/answer/78754 t2sm3669477iob.7 - gsmtp
        at SMTPConnection._formatError (/user_code/node_modules/nodemailer-smtp-transport/node_modules/smtp-connection/lib/smtp-connection.js:528:15)
        at SMTPConnection._actionAUTHComplete (/user_code/node_modules/nodemailer-smtp-transport/node_modules/smtp-connection/lib/smtp-connection.js:1231:30)
        at SMTPConnection.<anonymous> (/user_code/node_modules/nodemailer-smtp-transport/node_modules/smtp-connection/lib/smtp-connection.js:319:22)
        at SMTPConnection._processResponse (/user_code/node_modules/nodemailer-smtp-transport/node_modules/smtp-connection/lib/smtp-connection.js:669:16)
        at SMTPConnection._onData (/user_code/node_modules/nodemailer-smtp-transport/node_modules/smtp-connection/lib/smtp-connection.js:493:10)
        at emitOne (events.js:96:13)
        at TLSSocket.emit (events.js:188:7)
        at readableAddChunk (_stream_readable.js:176:18)
        at TLSSocket.Readable.push (_stream_readable.js:134:10)
        at TLSWrap.onread (net.js:559:20)
      code: 'EAUTH',
      response: '534-5.7.14 <https://accounts.google.com/signin/continue?sarp=1&scc=1&plt=AKgnsbsi\n534-5.7.14 qRQLfD9YlFZDsPj7b8QQACro9c41PjhSVo0NZ4i5ZHNlyycFi_FyRp8VdZ_dH5ffWWAABQ\n534-5.7.14 8rH2VcXkyZBFu00-YHJUQNOqL-IqxEsZqbFCwCgk4-bo1ZeDaKTdkEPhwMeIM2geChH8av\n534-5.7.14 0suN293poXFBAk3TzqKMMI34zCvrZlDio-E6JVmTrxyQ-Vn9Ji26LaojCvdm9Bq_4anc4U\n534-5.7.14 SpQrTnR57GNvB0vRX1BihDqKuKiXBJ5bfozV1D1euQq18PZK2m> Please log in via\n534-5.7.14 your web browser and then try again.\n534-5.7.14  Learn more at\n534 5.7.14  https://support.google.com/mail/answer/78754 t2sm3669477iob.7 - gsmtp',
      responseCode: 534,
      command: 'AUTH PLAIN' }

我什至已经关闭了allow secure apps in the google settings。但由于某种原因，这似乎不起作用。非常感谢任何帮助。

根据雷诺的建议，我尝试过firebase-samples/email-confirmation我遇到以下错误：

TypeError: snapshot.changed is not a function
at exports.sendEmailConfirmation.functions.database.ref.onWrite (/user_code/index.js:38:17)
at Object.<anonymous> (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:112:27)
at next (native)
at /user_code/node_modules/firebase-functions/lib/cloud-functions.js:28:71
at __awaiter (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:24:12)
at cloudFunction (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:82:36)
at /var/tmp/worker/worker.js:758:24
at process._tickDomainCallback (internal/process/next_tick.js:135:7)

Cheers

当您在后台触发的 Cloud Function 中执行异步操作时，您必须返回一个 Promise，这样 Cloud Function 就会等待该 Promise 解析才能终止。

Firebase 官方视频系列对此进行了很好的解释：https://firebase.google.com/docs/functions/video-series/ https://firebase.google.com/docs/functions/video-series/。特别是观看标题为“学习 JavaScript Promises”的三个视频（第 2 部分和第 3 部分特别关注后台触发的云函数，但之前的第 1 部分确实值得观看）。

所以你应该修改你的代码如下：

exports.sendEmails = functions.database.ref('/users/{userID}/credentials').onCreate((snap, context) => {

  const userID = context.params.userID;
  const vals = snap.val()

  userName = vals.name;
  emailRecepient = vals.email;

  return smtpTransport.sendMail(mailOptions);
});

如果您想将邮件发送的结果打印到控制台，可以这样做：

  return smtpTransport.sendMail(mailOptions)
    .then((info) => console.log('Email sent: ' + info.response))
    .catch((error) => console.log("Error sending email ---- ", error));
});

实际上有一个官方的 Cloud Functions 示例可以做到这一点，请参阅https://github.com/firebase/functions-samples/blob/master/email-confirmation/functions/index.js https://github.com/firebase/functions-samples/blob/master/email-confirmation/functions/index.js