mail_notif.go

package main

import (
	"fmt"
	"net"
	"net/smtp"
)

type mailNotificator struct {
	To        string
	From      string
	Server    string
	Login     string
	Password  string
	MinAmount uint64
}

var _ notificator = (*mailNotificator)(nil)

func NewMailNotificator(cfg notificatorConfig) *mailNotificator {
	return &mailNotificator{To: cfg.Params["Target"], From: cfg.Params["From"],
		Server: cfg.Params["SmtpServer"], Login: cfg.Params["Login"],
		Password: cfg.Params["Password"], MinAmount: cfg.MinAmount}
}

func (m *mailNotificator) Notify(amount uint64, comment string) (err error) {
	if amount < m.MinAmount {
		return fmt.Errorf("amount is too small, required %d got %d", m.MinAmount, amount)
	}
	var host string
	host, _, err = net.SplitHostPort(m.Server)
	if err != nil {
		return
	}
	auth := smtp.PlainAuth("", m.Login, m.Password, host)
	if comment != "" {
		comment = fmt.Sprintf("Sender said: \"%s\"", comment)
	}
	body := fmt.Sprintf("From: %s\nSubject: %s\n\nYou've received %d sats to your lightning address. %s", m.From,
		"New lightning address payment", amount, comment)
	err = smtp.SendMail(m.Server, auth, m.From, []string{m.To}, []byte(body))
	return
}

func (m *mailNotificator) Target() string {
	return fmt.Sprintf("%s => %s", m.From, m.To)
}