vikingowl
e07f4c4c64
Add styled HTML email templates for market submission notifications and magic link authentication, matching the frontend's forest green and gold design language. - Template engine using go:embed with clone-per-content pattern - Multipart/alternative MIME (text/plain + text/html) in SMTPSender - Base layout: dark green header, gold accent, parchment tones - Market submission template with details table and admin CTA - Magic link template with CTA button and fallback URL - Wire email sending into MagicLinkHandler (replaces TODO) - Add FRONTEND_URL config for template links
99 lines
2.2 KiB
Go
99 lines
2.2 KiB
Go
package email
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import (
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"context"
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"crypto/rand"
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"fmt"
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"log/slog"
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"net/smtp"
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)
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type Message struct {
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To string
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Subject string
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Body string
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HTML string
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}
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type Sender interface {
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Send(ctx context.Context, msg Message) error
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}
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type SMTPSender struct {
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host string
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port int
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user string
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pass string
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from string
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}
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func NewSMTPSender(host string, port int, user, pass, from string) *SMTPSender {
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return &SMTPSender{host: host, port: port, user: user, pass: pass, from: from}
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}
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func (s *SMTPSender) Send(_ context.Context, msg Message) error {
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addr := fmt.Sprintf("%s:%d", s.host, s.port)
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var auth smtp.Auth
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if s.user != "" {
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auth = smtp.PlainAuth("", s.user, s.pass, s.host)
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}
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raw := buildMIME(s.from, msg)
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if err := smtp.SendMail(addr, auth, s.from, []string{msg.To}, raw); err != nil {
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return fmt.Errorf("sending email to %s: %w", msg.To, err)
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}
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return nil
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}
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func buildMIME(from string, msg Message) []byte {
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headers := fmt.Sprintf("From: %s\r\nTo: %s\r\nSubject: %s\r\nMIME-Version: 1.0\r\n",
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from, msg.To, msg.Subject)
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if msg.HTML == "" {
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return []byte(headers + "Content-Type: text/plain; charset=UTF-8\r\n\r\n" + msg.Body)
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}
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boundary := randomBoundary()
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headers += fmt.Sprintf("Content-Type: multipart/alternative; boundary=%q\r\n\r\n", boundary)
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body := headers
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body += "--" + boundary + "\r\n"
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body += "Content-Type: text/plain; charset=UTF-8\r\n\r\n"
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body += msg.Body + "\r\n"
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body += "--" + boundary + "\r\n"
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body += "Content-Type: text/html; charset=UTF-8\r\n\r\n"
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body += msg.HTML + "\r\n"
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body += "--" + boundary + "--\r\n"
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return []byte(body)
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}
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func randomBoundary() string {
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var buf [16]byte
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_, _ = rand.Read(buf[:])
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return fmt.Sprintf("=_%x", buf)
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}
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type LogSender struct{}
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func (l *LogSender) Send(_ context.Context, msg Message) error {
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attrs := []any{
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"to", msg.To,
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"subject", msg.Subject,
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"body_len", len(msg.Body),
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}
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if msg.HTML != "" {
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attrs = append(attrs, "html_len", len(msg.HTML))
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}
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slog.Info("email (dev mode)", attrs...)
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return nil
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}
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func New(host string, port int, user, pass, from string) Sender {
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if host == "" {
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return &LogSender{}
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}
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return NewSMTPSender(host, port, user, pass, from)
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}
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