golang/mailling/main.go

package main

import (
	"bufio"
	"log"
	"os"
	"regexp"
	"strings"
	"time"

	mail "github.com/xhit/go-simple-mail"
	//"github.com/xhit/go-simple-mail/v2"
)

//SEE https://github.com/xhit/go-simple-mail

// CheckAddressMaillist
func CheckAddressMaillist(maillist string) string {
	strings.Replace(maillist, "noreply@aske-futurskill.com;", "", -1)
	maillistArray := strings.Split(maillist, ";")

	var index = 0
	re := regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")
	var newMaillist = ""
	for _, elem := range maillistArray {
		if re.MatchString(elem) {
			if index > 0 {
				newMaillist += ";"
			}
			newMaillist += elem
			index++
		}
	}
	return newMaillist
}

// GetMailtoFile
func GetMailtoFile(filename string) []string {
	file, err := os.Open(filename)
	if err != nil {
		log.Panic(err)
	}
	scanner := bufio.NewScanner(file)
	scanner.Split(bufio.ScanLines)
	var txtlines []string

	for scanner.Scan() {
		txtlines = append(txtlines, scanner.Text())
	}
	file.Close()
	return txtlines
}

// PrepareMail ...
func PrepareMail(email string, htmlBody string, imageList []string) *mail.Email {
	email := mail.NewMSG()

	email.SetFrom("From Support ASkE <noreply@aske-futurskill.com>")
	email.AddTo("support@aske-futurskill.com")
	email.AddBcc(maillingList)
	email.SetSubject("[TEST] MAILLING")

	email.SetBody(mail.TextHTML, htmlBody)
	for image := range imageList {
		email.AddInline(string.Split(imageList, ';')[0], string.Split(imageList, ';')[1])
	}
	return email
}

func main() {

	filename := os.Args[1]

	smtpServ := xmail.NewSMTPClient()
	server.Host = "in-v3.mailjet.com"
	server.Port = 587
	server.Username = "c4832eafdd5b13635a5d1273cb998d3f"
	server.Password = "ad985e178e340b85e192097b02026429"
	server.Encryption = mail.EncryptionTLS

	// smtpServ.Authentication = mail.AuthPlain

	smtpServ.KeepAlive = false
	smtpServ.ConnectTimeout = 10 * time.Second
	smtpServ.SendTimeout = 10 * time.Second

	smtpClient, err := smtpServ.Connect()
	if err != nil {
		log.Fatal(err)
	}

	maillingList := GetMailtoFile()
	for email := range maillingList {
		email := PrepareMail(email)
		err = email.Send(smtpClient)

		if err != nil {
			log.Println(err)
		} else {
			log.Println("Email sent")
		}
	}
}