golang 创建发送邮件服务

package main

import (
	"encoding/json"
	"github.com/Unknwon/goconfig"
	"gopkg.in/gomail.v2"
	"log"
	"net/http"
	"net/url"
	"regexp"
)

// 一些必须的配置
type Config struct {
	User       string
	Password   string
	Host       string
	Port       int
	ServerAddr string
}

// 返回的response对象
type Response struct {
	Success bool   `json:"success"`
	Msg     string `json:"msg"`
	ErrMsg  string `json:"err_msg"`
}

func NewResponse(success bool, msg string, errMsg string) *Response {
	return &Response{Success: success, Msg: msg, ErrMsg: errMsg}
}

// 处理发送邮件的表单
type EmailForm struct {
	ToEmail string
	Subject string
	Body    string
}

func NewEmailForm(toEmail string, subject string, body string) *EmailForm {
	return &EmailForm{ToEmail: toEmail, Subject: subject, Body: body}
}

// 发送邮件
func sendMail(toMail, subject, body string) error {
	mail := gomail.NewMessage()
	mail.SetHeader("From", e.User)
	mail.SetHeader("To", []string{toMail}...)
	mail.SetHeader("Subject", subject)
	mail.SetBody("text/html", body)
	return gomail.NewDialer(e.Host, e.Port, e.User, e.Password).DialAndSend(mail)
}

// 邮件发送的表单校验
func ValidateEmailForm(emailForm url.Values) (*EmailForm, bool) {
	toEmail := emailForm.Get("to_email")
	subject := emailForm.Get("subject")
	body := emailForm.Get("body")

	pattern := `w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*`

	reg := regexp.MustCompile(pattern)

	var ok bool

	if ok = reg.Match([]byte(toEmail)); ok == true {
		return NewEmailForm(toEmail, subject, body), ok
	}
	return nil, ok
}

// 发邮件的handler
func HandleEmail(writer http.ResponseWriter, request *http.Request) {

	response := NewResponse(false, "", "服务器开小差了")

	if request.Method == "POST" {

		writer.Header().Set("content-type", "application/json; charset=utf-8")

		if err := request.ParseForm(); err == nil {
			// todo 参数校验
			var emailForm *EmailForm

			var ok bool

			if emailForm, ok = ValidateEmailForm(request.Form); ok == false {
				response = NewResponse(false, "", "邮箱格式不正确")
				goto Reply
			}

			// 这里可以选择开一个协程来发邮件速度会更快
			//go sendMail(emailForm.ToEmail, emailForm.Subject, emailForm.Body)
			if err := sendMail(emailForm.ToEmail, emailForm.Subject, emailForm.Body); err == nil {
				response = NewResponse(true, "发送成功!", "")
				goto Reply
			}
		}

		goto Reply

	Reply:
		result, _ := json.Marshal(response)
		writer.Write(result)

	} else {
		writer.WriteHeader(405)
		writer.Write([]byte("Method Not Allowed"))
	}
}

var e *Config

// 读配置文件初始化参数
func loadConfigFromFile(filePath string) {

	cfg, err := goconfig.LoadConfigFile(filePath)
	if err != nil {
		log.Fatal(err)
	}
	if e.Host, err = cfg.GetValue("email", "host"); err != nil {
		log.Fatal(err)
	}
	if e.Port, err = cfg.Int("email", "port"); err != nil {
		log.Fatal(err)
	}
	if e.Password, err = cfg.GetValue("email", "password"); err != nil {
		log.Fatal(err)
	}
	if e.User, err = cfg.GetValue("email", "user"); err != nil {
		log.Fatal(err)
	}
	e.ServerAddr = cfg.MustValue("server", "address", ":8009")
}

// 全局初始化函数
func init() {
	e = new(Config)
	loadConfigFromFile("config.ini")
}

func main() {

	http.HandleFunc("/email/", HandleEmail)

	err := http.ListenAndServe(e.ServerAddr, nil)

	if err != nil {
		log.Fatal(err)
	}
}

最后配置文件格式

[email]
host = smtp.qq.com
port = 25
user = 
password = 

[server]
address = :8009