ntfy/server/mailer.go
Philipp Heckel bcc424f2aa Oops
2021-12-26 14:36:38 +01:00

119 lines
2.9 KiB
Go

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
}