added mail functionality

internal/services/email_service.go

@@ -0,0 +1,77 @@
+package services
+
+import (
+	"GoMembership/internal/models"
+	"GoMembership/pkg/logger"
+	"bytes"
+	"gopkg.in/gomail.v2"
+	"html/template"
+)
+
+type EmailService struct {
+	dialer     *gomail.Dialer
+	adminEmail string
+}
+
+func NewEmailService(host string, port int, username, password, adminEmail string) *EmailService {
+	dialer := gomail.NewDialer(host, port, username, password)
+	return &EmailService{dialer: dialer, adminEmail: adminEmail}
+}
+
+func (s *EmailService) SendEmail(to string, subject string, body string) error {
+	msg := gomail.NewMessage()
+	msg.SetHeader("From", s.dialer.Username)
+	msg.SetHeader("To", to)
+	msg.SetHeader("Subject", subject)
+	msg.SetBody("text/html", body)
+
+	if err := s.dialer.DialAndSend(msg); err != nil {
+		logger.Error.Printf("Could not send email to %s: %v", to, err)
+		return err
+	}
+	logger.Info.Printf("Email sent to %s", to)
+	return nil
+}
+
+func ParseTemplate(path string, data interface{}) (string, error) {
+	// Read the email template file
+	tpl, err := template.ParseFiles(path)
+	if err != nil {
+		logger.Error.Printf("Failed to parse email template: %v", err)
+		return "", err
+	}
+
+	// Buffer to hold the rendered template
+	var tplBuffer bytes.Buffer
+	if err := tpl.Execute(&tplBuffer, data); err != nil {
+		logger.Error.Printf("Failed to execute email template: %v", err)
+		return "", err
+	}
+
+	return tplBuffer.String(), nil
+}
+func (s *EmailService) SendWelcomeEmail(user models.User) error {
+
+	// Prepare data to be injected into the template
+	data := struct {
+		FirstName string
+		LastName  string
+	}{
+		FirstName: user.FirstName,
+		LastName:  user.LastName,
+	}
+
+	subject := "Willkommen beim Dörpsmobil Hasloh e.V."
+	body, err := ParseTemplate("internal/templates/mail_welcome.html", data)
+	if err != nil {
+		logger.Error.Print("Couldn't send welcome mail")
+		return err
+	}
+	return s.SendEmail(user.Email, subject, body)
+}
+
+func (s *EmailService) NotifyAdminOfNewUser(userEmail string) error {
+	subject := "New User Registration"
+	body := "<p>A new user has registered with the email: " + userEmail + "</p>"
+	return s.SendEmail(s.adminEmail, subject, body)
+}