nodeJS基於smtp發郵件

郵件的協議smtp是tcp/ip族中的一個協議,因此咱們此次考慮使用net模塊來發送郵件。node

const net = require('net')
const assert = require('assert')

const host = 'smtp.163.com',
      port = 25,
      user = 'zhangjunyi199616@163.com',
      pass = '*********',
      to = '442665319@qq.com',
      subject = '少林武當大叮噹',
      msg = `你好,張啊咩同窗,我是一封來自node的郵件
      
      愛你喲123
      `

let client = net.createConnection({host,port},async() => {
    console.log('鏈接上了')
    let code
    code = await getData()
    assert(code == 220)
    // 打招呼
    sendData('HELO ' + host)

    code = await getData()
    assert(code == 250)
    // 要登錄
    sendData('auth login')

    code = await getData()
    assert(code == 334)
    // 給用戶名(郵箱)---base64編碼
    sendData(new Buffer(user).toString('base64'))

    code = await getData()
    assert(code == 334)
    // 給密碼---base64編碼
    sendData(new Buffer(pass).toString('base64'))

    code = await getData()
    assert(code == 235)
    // 給用戶名(郵箱
    sendData(`MAIL FROM:<${user}>`)

    code = await getData()
    assert(code == 250)
    // 給目標郵箱
    sendData(`RCPT TO:<${to}>`)

    code = await getData()
    assert(code == 250)
    // 要發送數據
    sendData('DATA')

    code = await getData()
    assert(code == 354)
    // 發主題
    sendData(`SUBJECT:${subject}`)
    // 發發件人
    sendData(`FROM:${user}`)    
    // 發目標
    sendData(`TO:${to}\r\n`)
    sendData(`${msg}\r\n.`)

    code = await getData()
    sendData(`QUIT`)
    
})

function getData() {
    return new Promise((resolve,reject) => {
        next()
        function next(){
            if(data) {
                let temp = data
                data =null
                resolve(temp)
            } else {
                setTimeout(next,0)
            }
        }
    })
}

function sendData(msg) {
    console.log('發送:'+msg)
    client.write(msg+'\r\n')
}

let data = null
client.on('data', d => {
    console.log('接受到:'+d.toString())
    data = d.toString().substring(0,3)
})
client.on('end', () => {
    console.log('鏈接斷開')
})

過程:async

鏈接上了
接受到:220 163.com Anti-spam GT for Coremail System (163com[20141201])

發送:HELO smtp.163.com
接受到:250 OK

發送:auth login
接受到:334 dXNlcm5hbWU6

發送:emhhbmdqdW55aTE5OTYxNkAxNjMuY29t
接受到:334 UGFzc3dvcmQ6

發送:emhhbmc4NjQ3NzY2MA==
接受到:235 Authentication successful

發送:MAIL FROM:<zhangjunyi199616@163.com>
接受到:250 Mail OK

發送:RCPT TO:<442665319@qq.com>
接受到:250 Mail OK

發送:DATA
接受到:354 End data with <CR><LF>.<CR><LF>

發送:SUBJECT:少林武當大叮噹
發送:FROM:zhangjunyi199616@163.com
發送:TO:442665319@qq.com

發送:你好,張啊咩同窗,我是一封來自node的郵件

      愛你喲123

.
接受到:250 Mail OK queued as smtp7,C8CowAC3Xh8MErdaVr+lLw--.64772S2 1521947148

發送:QUIT
接受到:221 Bye

鏈接斷開
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