change receiver field type

mail/mail.go

@@ -10,20 +10,11 @@ import (
 type Email struct {
 	Path      string
 	Sender    string `json:"sender"`
-	Receivers []string `json:"receivers"`
+	Receivers string `json:"receivers"`
 	Subject   string `json:"subject"`
 	Content   string `json:"content"`
 }
 
-func NewEmail(sender string, receivers []string, subject, content string) Email {
-	return Email{
-		Sender:    sender,
-		Receivers: receivers,
-		Subject:   subject,
-		Content:   content,
-	}
-}
-
 func FromJSON(path string) (Email, error) {
 	var mail Email
 
@@ -39,10 +30,14 @@ func FromJSON(path string) (Email, error) {
 	return mail, nil
 }
 
+func (e Email) GetReceivers() []string {
+	return strings.Split(e.Receivers, ",")
+}
+
 func (e Email) Generate() []byte {
 	mail := fmt.Sprintf(
 		"To: %s\nFrom: %s\nContent-Type: text/html;charset=utf-8\nSubject: %s\n\n%s",
-		strings.Join(e.Receivers, ","),
+		e.Receivers,
 		e.Sender,
 		e.Subject,
 		e.Content,

services/sender.go

@@ -42,7 +42,7 @@ func (s Sender) SendMail(email mail.Email) error {
 	auth := smtp.PlainAuth("", s.smtpConfig.User, s.smtpConfig.Password, s.smtpConfig.Url)
 	log.Debug().Msg("SMTP authentication succeed")
 
-	if err := smtp.SendMail(s.smtpConfig.GetFullUrl(), auth, email.Sender, email.Receivers, email.Generate()); err != nil {
+	if err := smtp.SendMail(s.smtpConfig.GetFullUrl(), auth, email.Sender, email.GetReceivers(), email.Generate()); err != nil {
 		log.Err(err).Msg("error while sending email")
 		return err
 	}