通过nodemailer nodejs发送邮件

Question

首先，我正在检查数据库中存在的电子邮件，如果存在，那么它将生成哈希码，之后它将更新数据库，一旦生成哈希码，那么电子邮件将发送给用户。所以我不知道如何发送电子邮件，请任何帮助。

const md5 = require('md5');
let transporter = require("../config/transporter");

export const newemail = async(req,res ) => {
try{
var re = /^(([^<>()[]\.,;:s@"]+(.[^<>()[]\.,;:s@"]+)*)|(".+"))@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}])|(([a-zA-Z-0-9]+.)+[a-zA-Z]{2,}))$/;
const user = await db.findOne('USER', { email: req.body.email });
res.status(200).json(user);

if (!re.test(req.body.email)) {
res.json('Email address is not valid!');
} else {
const email = req.body.email;
const name = email.substring(0, email.lastIndexOf("@"));
const domain = email.substring(email.lastIndexOf("@") +1);
const hashCode = md5(name + domain);
function sendingMail(referredBy){

const user = await db.findOneandUpdate('USER', { email: req.body.email, referralCode: hashCode, referredBy: referredBy }); 
const email = user.email;
console.log(email + "email");
//send verification mail
let mailOptions = {
from: '[e-mail]', // sender address
to: email, // list of receivers
subject: settingsConfig.subjectLine, // Subject line
text: settingsConfig.message, // plaintext body
html: settingConfig.message // html body
};
console.log("MAILING!");
console.log(mailOptions)
// send mail with defined transport object
transporter.sendMail(mailOptions, function (error, info) {
if (error) {
return console.log(error);
}
console.log('Message sent: ' + info.response);
});
};
}
}
catch (err) {
console.log(err)
res.status(500).json({ message: "Something went wrong" });
}
}

请教你如何更进一步。

Answer 1

const md5 = require('md5');
let transporter = require("../config/transporter");

export const sendEmail = async (to, from, subject, body) => {
// use any mailer library to send the email
}
export const isValidEmail = async (email) => {
const regex = /^(([^<>()[]\.,;:s@"]+(.[^<>()[]\.,;:s@"]+)*)|(".+"))@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}])|(([a-zA-Z-0-9]+.)+[a-zA-Z]{2,}))$/;
return regex.test(email);
}
export const findUserByEmail = async (email) => {
// db instance
return await db.findOne('USER', { email });
}
export const generateHash = async (email) => {
const name = email.substring(0, email.lastIndexOf("@"));
const domain = email.substring(email.lastIndexOf("@") +1);
return md5(name + domain);
}

export const verifyAndEmail = async(req,res ) => {
try{
// var re = /^(([^<>()[]\.,;:s@"]+(.[^<>()[]\.,;:s@"]+)*)|(".+"))@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}])|(([a-zA-Z-0-9]+.)+[a-zA-Z]{2,}))$/;
// const user = await db.findOne('USER', { email: req.body.email });
// res.status(200).json(user);
// step-1 destructure email from request body
const {
email
} = req.body;
// step-2, validate the email id
const isEmailValid = await isValidEmail(email);
if(!isEmailValid) {
throw new Error('Invalid email');
// return appropiate response
}
// step-3 find a user by email
const user = await findUserByEmail(email);
// step-4 validate, if user does not exists
if (!user) {
throw new Error('User does not exist');
// return appropiate response
}
//step-5 generate the hash using user's email
const hash = await generateHash(email);
// step-6, call send email method with the parameters
}
catch (err) {
console.log(err)
res.status(500).json({ message: "Something went wrong" });
}
}

I would suggest, you should refactor your code to following. 
Run it and let me know if you face any issues. 

This approach will help you to debug the error.