package server import ( _ "embed" // required by go:embed "encoding/json" "fmt" "heckel.io/ntfy/util" "mime" "net" "net/smtp" "strings" "time" ) type mailer interface { Send(from, to string, m *message) error } type smtpMailer struct { config *Config } func (s *smtpMailer) Send(senderIP, to string, m *message) error { host, _, err := net.SplitHostPort(s.config.SMTPAddr) if err != nil { return err } message, err := formatMail(s.config.BaseURL, senderIP, s.config.SMTPFrom, to, m) if err != nil { return err } auth := smtp.PlainAuth("", s.config.SMTPUser, s.config.SMTPPass, host) return smtp.SendMail(s.config.SMTPAddr, auth, s.config.SMTPFrom, []string{to}, []byte(message)) } func formatMail(baseURL, senderIP, from, to string, m *message) (string, error) { topicURL := baseURL + "/" + m.Topic subject := m.Title if subject == "" { subject = m.Message } subject = strings.ReplaceAll(strings.ReplaceAll(subject, "\r", ""), "\n", " ") message := m.Message trailer := "" if len(m.Tags) > 0 { emojis, tags, err := toEmojis(m.Tags) if err != nil { return "", err } if len(emojis) > 0 { subject = strings.Join(emojis, " ") + " " + subject } if len(tags) > 0 { trailer = "Tags: " + strings.Join(tags, ", ") } } if m.Priority != 0 && m.Priority != 3 { priority, err := util.PriorityString(m.Priority) if err != nil { return "", err } if trailer != "" { trailer += "\n" } trailer += fmt.Sprintf("Priority: %s", priority) } if trailer != "" { message += "\n\n" + trailer } subject = mime.BEncoding.Encode("utf-8", subject) body := `From: "{shortTopicURL}" <{from}> To: {to} Subject: {subject} Content-Type: text/plain; charset="utf-8" {message} -- This message was sent by {ip} at {time} via {topicURL}` body = strings.ReplaceAll(body, "{from}", from) body = strings.ReplaceAll(body, "{to}", to) body = strings.ReplaceAll(body, "{subject}", subject) body = strings.ReplaceAll(body, "{message}", message) body = strings.ReplaceAll(body, "{topicURL}", topicURL) body = strings.ReplaceAll(body, "{shortTopicURL}", util.ShortTopicURL(topicURL)) body = strings.ReplaceAll(body, "{time}", time.Unix(m.Time, 0).UTC().Format(time.RFC1123)) body = strings.ReplaceAll(body, "{ip}", senderIP) return body, nil } var ( //go:embed "mailer_emoji.json" emojisJSON string ) type emoji struct { Emoji string `json:"emoji"` Aliases []string `json:"aliases"` } func toEmojis(tags []string) (emojisOut []string, tagsOut []string, err error) { var emojis []emoji if err = json.Unmarshal([]byte(emojisJSON), &emojis); err != nil { return nil, nil, err } tagsOut = make([]string, 0) emojisOut = make([]string, 0) nextTag: for _, t := range tags { // TODO Super inefficient; we should just create a .json file with a map for _, e := range emojis { if util.InStringList(e.Aliases, t) { emojisOut = append(emojisOut, e.Emoji) continue nextTag } } tagsOut = append(tagsOut, t) } return }