如何在Firebase中免费发送电子邮件？

Question

我知道Firebase不允许您使用第三方电子邮件服务发送电子邮件。所以唯一的方法是通过Gmail发送。

所以我在互联网上搜索了一些方法，这里有一个片段可以让我免费发送电子邮件。

export const shareSpeechWithEmail = functions.firestore
  .document("/sharedSpeeches/{userId}")
  .onCreate(async (snapshot, context) => {
    // const userId = context.params.userId;
    // const data = snapshot.data();
    const mailTransport = nodemailer.createTransport(
      `smtps://${process.env.USER_EMAIL}:${process.env.USER_PASSWORD}@smtp.gmail.com`
    );


    const mailOptions = {
      to: "[e-mail]",
      subject: `Message test`,
      html: `<p><b>test</b></p>`
    };
    try {
      return mailTransport.sendMail(mailOptions);
    } catch (err) {
      console.log(err);
      return Promise.reject(err);
    }
  });

我想创建一个模板，所以我在nodemailer中使用了这个名为email-模板的包。但是该函数不会在Firebase控制台中执行，也不会显示错误并显示与“计费”相关的警告。

export const shareSpeechWithEmail = functions.firestore
  .document("/sharedSpeeches/{userId}")
  .onCreate(async (snapshot, context) => {

    const email = new Email({
      send: true,
      preview: false,
      views: {
        root: path.resolve(__dirname, "../../src/emails")
        // root: path.resolve(__dirname, "emails")
      },
      message: {
        // from: "<[e-mail]>"
        from: process.env.USER_EMAIL
      },
      transport: {
        secure: false,
        host: "smtp.gmail.com",
        port: 465,
        auth: {
          user: process.env.USER_EMAIL,
          pass: process.env.USER_PASSWORD
        }
      }
    });

    try {
      return email.send({
        template: "sharedSpeech",
        message: {
          to: "[e-mail]",
          subject: "message test"
        },
        locals: {
          toUser: "testuser1",
          fromUser: "testuser2",
          title: "Speech 1",
          body: "<p>test using email <b>templates</b></p>"
        }
      });
    } catch (err) {
      console.log(err);
      return Promise.reject(err);
    }
  });

Answer 1

直接通过functions.https.onCall（...）调用sendMail（）云函数：

正如@Micha提到的，不要忘记为传出电子邮件启用安全性较低的应用程序：https://www.google.com/settings/security/lesssecureapps

const functions = require('firebase-functions');
const nodemailer = require('nodemailer');

let mailTransport = nodemailer.createTransport({
    service: 'gmail',
    auth: {
        user: '[e-mail]',
        pass: '11112222'
    }
});

exports.sendMail = functions.https.onCall((data, context) => {

    console.log('enter exports.sendMail, data: ' + JSON.stringify(data));

    const recipientEmail = data['recipientEmail'];
    console.log('recipientEmail: ' + recipientEmail);

    const mailOptions = {
        from: 'Abc Support <[e-mail]>',
        to: recipientEmail,
        html:
           `<p style="font-size: 16px;">Thanks for signing up</p>
            <p style="font-size: 12px;">Stay tuned for more updates soon</p>
            <p style="font-size: 12px;">Best Regards,</p>
            <p style="font-size: 12px;">-Support Team</p>
          ` // email content in HTML
    };

    mailOptions.subject = 'Welcome to Abc';

    return mailTransport.sendMail(mailOptions).then(() => {
        console.log('email sent to:', recipientEmail);
        return new Promise(((resolve, reject) => {
       
            return resolve({
                result: 'email sent to: ' + recipientEmail
            });
        }));
    });
});

还要感谢：Micha的帖子

Answer 2

您可以使用 nodemailer 发送电子邮件：

npm install nodemailer cors

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const nodemailer = require('nodemailer');
const cors = require('cors')({origin: true});
admin.initializeApp();

/**
* Here we're using Gmail to send 
*/
let transporter = nodemailer.createTransport({
    service: 'gmail',
    auth: {
        user: '[e-mail]',
        pass: 'yourgmailaccpassword'
    }
});

exports.sendMail = functions.https.onRequest((req, res) => {
    cors(req, res, () => {

        // getting dest email by query string
        const dest = req.query.dest;

        const mailOptions = {
            from: 'Your Account Name <[e-mail]>', // Something like: Jane Doe <[e-mail]>
            to: dest,
            subject: 'test', // email subject
            html: `<p style="font-size: 16px;">test it!!</p>
                <br />
            ` // email content in HTML
        };

        // returning result
        return transporter.sendMail(mailOptions, (erro, info) => {
            if(erro){
                return res.send(erro.toString());
            }
            return res.send('Sended');
        });
    });    
});

另请参见此处

设置安全级别以避免错误消息：转到：https://www.google.com/settings/security/lesssecureapps将访问不太安全的应用程序设置为启用

请参阅

Answer 3

只要您的项目在Blaze计划中，您绝对可以使用第三方服务和Cloud Functions发送电子邮件。官方提供的示例甚至建议“如果切换到Sendgrid、Mailjet或Mailgun，请确保您在Firebase项目上启用计费，因为这是向非Google服务发送请求所必需的。”

https://github.com/firebase/functions-samples/tree/master/quickstarts/email-users

这里的关键是，无论您使用哪种电子邮件系统，您都确实需要升级到Blaze计划才能建立传出连接。