需求
- 我的博客需要增加登錄驗證碼,想通過郵件發送驗證碼
- 希望提供一個http服務,其他服務和編程語言不必再寫一個發郵件的方法
實現
package main
import (
"encoding/base64"
"errors"
"net"
"net/http"
"strconv"
"time"
)
func main() {
http.HandleFunc("/Captcha", Captcha)
http.ListenAndServe("localhost:8080", nil)
}
func Captcha(w http.ResponseWriter, r *http.Request) {
code := r.FormValue("code")
if code == "" {
w.Write([]byte("false"))
return
}
err := sendCaptcha(code, "smtp.qq.com:25", "[email protected]", "郵箱授權碼,不是登錄密碼", "[email protected]", "[email protected]")
if err == nil {
w.Write([]byte("true"))
return
}
w.Write([]byte(err.Error()))
}
func sendCaptcha(code, addr, user, pass, form, to string) error {
c, err := net.Dial("tcp", addr)
if err != nil {
return err
}
defer c.Close()
buf := make([]byte, 256)
n, err := c.Read(buf)
if err != nil {
return err
}
_, err = c.Write([]byte("EHLO " + strconv.FormatInt(time.Now().Unix(), 10) + "\r\n"))
if err != nil {
return err
}
n, err = c.Read(buf)
if err != nil {
return err
}
_, err = c.Write([]byte("AUTH LOGIN\r\n"))
if err != nil {
return err
}
n, err = c.Read(buf)
if err != nil {
return err
}
tmp := base64.StdEncoding.EncodeToString([]byte(user))
_, err = c.Write([]byte(tmp + "\r\n"))
if err != nil {
return err
}
n, err = c.Read(buf)
if err != nil {
return err
}
tmp = base64.StdEncoding.EncodeToString([]byte(pass))
_, err = c.Write([]byte(tmp + "\r\n"))
if err != nil {
return err
}
n, err = c.Read(buf)
if err != nil {
return err
}
_, err = c.Write([]byte("MAIL FROM:<" + form + ">\r\n"))
if err != nil {
return err
}
n, err = c.Read(buf)
if err != nil {
return err
}
_, err = c.Write([]byte("RCPT TO:<" + to + ">\r\n"))
if err != nil {
return err
}
n, err = c.Read(buf)
if err != nil {
return err
}
_, err = c.Write([]byte("DATA\r\n"))
if err != nil {
return err
}
n, err = c.Read(buf)
if err != nil {
return err
}
_, err = c.Write([]byte("from:" + form + "\nto:" + to + "\nsubject:Captcha\nMIMI-Version:1.0\r\n" +
"Content-Type: multipart/mixed; boundary=\"#BOUNDARY#\"\r\n\r\n" +
"Content-Transfer-Encoding:7bit\r\n\r\n" +
"--#BOUNDARY#\r\n" +
"Content-Type: text/plain; charset=utf-8\r\n" +
"Content-Transfer-Encoding: printable\r\n\r\n"))
if err != nil {
return err
}
_, err = c.Write([]byte(code))
if err != nil {
return err
}
_, err = c.Write([]byte("\r\n--#BOUNDARY#\r\n\r\n--#BOUNDARY#--\r\n.\r\nQUIT\r\n"))
if err != nil {
return err
}
n, err = c.Read(buf)
if err != nil {
return err
}
if buf[0] == '2' && buf[1] == '5' && buf[2] == '0' {
return nil
}
return errors.New(string(buf[:n]))
}
用法
- 編譯運行上述go代碼
- 測試一下curl http://127.0.0.1:8080/Captcha?code=321
總結
- 之所以沒有使用go自帶的smtp是因爲新版本go需要用tls連接,當然網上一大堆方案,但是我這裏只是實現簡單的發送郵件驗證碼而已,沒必要搞那麼複雜
- 我的這個服務是不會對外提供的,只是提供localhost的服務,這樣比較安全,當然有需要的可以自己改
- 這樣我的後臺服務就能通過簡單http get發送一個驗證碼郵件
- 特別注意的是現在郵箱的smtp密碼都是授權碼,不是登錄的密碼了