feat: Move mail system to shared

server/internal/notify/smtp.go

@@ -1,90 +1,38 @@
 package notify
 
 import (
-	"crypto/tls"
 	"fmt"
-	"net"
-	"net/smtp"
-	"strings"
-	"time"
 
 	"github.com/mrhid6/vantage/server/internal/models"
+	"github.com/mrhid6/vantage/shared/mail"
 )
 
-const smtpTimeout = 15 * time.Second
-
+// dispatchSMTP delivers a state change over one channel's own SMTP settings.
+//
+// The transport, the envelope and the look of the message all live in
+// shared/mail, which admin and sitesvc use too — a Vantage alert and a Vantage
+// licence email should not look like they came from different products. This
+// function only turns a channel document into a Sender.
 func dispatchSMTP(ch models.NotificationChannel, ev Event) error {
-	host := ch.Config["host"]
-	port := ch.Config["port"]
-	from := ch.Config["from"]
 	to := ch.Config["to"]
-	if host == "" || port == "" || from == "" || to == "" {
+	sender := mail.Sender{
+		Host:     ch.Config["host"],
+		Port:     ch.Config["port"],
+		From:     ch.Config["from"],
+		Username: ch.Config["username"],
+		Password: ch.Config["password"],
+	}
+	if !sender.Enabled() || sender.Port == "" || to == "" {
 		return fmt.Errorf("smtp: missing host/port/from/to")
 	}
 
-	addr := net.JoinHostPort(host, port)
-	conn, err := net.DialTimeout("tcp", addr, smtpTimeout)
-	if err != nil {
-		return fmt.Errorf("smtp: dial %s: %w", addr, err)
-	}
-	_ = conn.SetDeadline(time.Now().Add(smtpTimeout))
-
-	if port == "465" {
-		conn = tls.Client(conn, &tls.Config{ServerName: host})
-	}
-
-	c, err := smtp.NewClient(conn, host)
-	if err != nil {
-		conn.Close()
-		return fmt.Errorf("smtp: client: %w", err)
-	}
-	defer c.Close()
-
-	if port != "465" {
-		if ok, _ := c.Extension("STARTTLS"); ok {
-			if err := c.StartTLS(&tls.Config{ServerName: host}); err != nil {
-				return fmt.Errorf("smtp: starttls: %w", err)
-			}
-		}
-	}
-
-	if user := ch.Config["username"]; user != "" {
-		if err := c.Auth(smtp.PlainAuth("", user, ch.Config["password"], host)); err != nil {
-			return fmt.Errorf("smtp: auth: %w", err)
-		}
-	}
-
-	recipients := strings.Split(to, ",")
-	for i := range recipients {
-		recipients[i] = strings.TrimSpace(recipients[i])
-	}
-
-	if err := c.Mail(from); err != nil {
-		return fmt.Errorf("smtp: mail from: %w", err)
-	}
-	for _, rcpt := range recipients {
-		if rcpt == "" {
-			continue
-		}
-		if err := c.Rcpt(rcpt); err != nil {
-			return fmt.Errorf("smtp: rcpt %s: %w", rcpt, err)
-		}
-	}
-
-	msg, err := buildMIME(from, to, ev.title(), textEmail(ev), htmlEmail(ev))
-	if err != nil {
-		return fmt.Errorf("smtp: build message: %w", err)
-	}
-
-	w, err := c.Data()
-	if err != nil {
-		return fmt.Errorf("smtp: data: %w", err)
-	}
-	if _, err := w.Write(msg); err != nil {
-		return fmt.Errorf("smtp: write: %w", err)
-	}
-	if err := w.Close(); err != nil {
-		return fmt.Errorf("smtp: close data: %w", err)
-	}
-	return c.Quit()
+	return sender.SendMonitorAlert(to, mail.MonitorEvent{
+		MonitorName: ev.MonitorName,
+		Type:        ev.Type,
+		OldStatus:   ev.OldStatus,
+		NewStatus:   ev.NewStatus,
+		Message:     ev.Message,
+		Time:        ev.Time,
+		Down:        ev.NewStatus == models.StatusDown,
+	})
 }

server/internal/notify/template.go

@@ -1,161 +0,0 @@
-package notify
-
-import (
-	"fmt"
-	"html"
-	"mime/multipart"
-	"net/textproto"
-	"strings"
-
-	"github.com/mrhid6/vantage/server/internal/models"
-)
-
-const (
-	colBg        = "#0f1117"
-	colSurface   = "#1a1d27"
-	colSurface2  = "#232635"
-	colBorder    = "#2e3147"
-	colText      = "#e8eaf0"
-	colTextMuted = "#9095a8"
-	colAccent    = "#6366f1"
-	colSuccess   = "#22c55e"
-	colDanger    = "#ef4444"
-)
-
-func statusColor(status string) string {
-	switch status {
-	case models.StatusUp:
-		return colSuccess
-	case models.StatusDown:
-		return colDanger
-	default:
-		return colTextMuted
-	}
-}
-
-func buildMIME(from, to, subject, text, htmlBody string) ([]byte, error) {
-	var buf strings.Builder
-	w := multipart.NewWriter(&buf)
-
-	var head strings.Builder
-	head.WriteString("From: " + from + "\r\n")
-	head.WriteString("To: " + to + "\r\n")
-	head.WriteString("Subject: " + subject + "\r\n")
-	head.WriteString("MIME-Version: 1.0\r\n")
-	head.WriteString(fmt.Sprintf("Content-Type: multipart/alternative; boundary=%s\r\n\r\n", w.Boundary()))
-
-	textPart, err := w.CreatePart(textproto.MIMEHeader{"Content-Type": {"text/plain; charset=UTF-8"}})
-	if err != nil {
-		return nil, err
-	}
-	textPart.Write([]byte(text))
-
-	htmlPart, err := w.CreatePart(textproto.MIMEHeader{"Content-Type": {"text/html; charset=UTF-8"}})
-	if err != nil {
-		return nil, err
-	}
-	htmlPart.Write([]byte(htmlBody))
-
-	if err := w.Close(); err != nil {
-		return nil, err
-	}
-	return []byte(head.String() + buf.String()), nil
-}
-
-func htmlEmail(ev Event) string {
-	accent := statusColor(ev.NewStatus)
-	label := "Recovered"
-	if ev.NewStatus == models.StatusDown {
-		label = "Down"
-	}
-
-	esc := html.EscapeString
-	row := func(k, v string) string {
-		if v == "" {
-			v = ""
-		}
-		return fmt.Sprintf(
-			`<tr>`+
-				`<td style="padding:8px 0;color:%s;font-size:13px;width:120px;">%s</td>`+
-				`<td style="padding:8px 0;color:%s;font-size:13px;font-weight:500;">%s</td>`+
-				`</tr>`,
-			colTextMuted, k, colText, esc(v))
-	}
-
-	message := ""
-	if ev.Message != "" {
-		message = fmt.Sprintf(
-			`<p style="margin:0 0 20px;padding:12px 14px;background:%s;border:1px solid %s;border-radius:8px;color:%s;font-size:13px;">%s</p>`,
-			colSurface2, colBorder, colText, esc(ev.Message))
-	}
-
-	transition := esc(ev.OldStatus) + " → " + esc(ev.NewStatus)
-
-	return fmt.Sprintf(`<!DOCTYPE html>
-<html>
-<body style="margin:0;padding:0;background:%s;">
-  <table role="presentation" width="100%%" cellpadding="0" cellspacing="0" style="background:%s;padding:32px 0;">
-    <tr>
-      <td align="center">
-        <table role="presentation" width="480" cellpadding="0" cellspacing="0" style="max-width:480px;background:%s;border:1px solid %s;border-radius:12px;overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;">
-          <tr><td style="height:4px;background:%s;"></td></tr>
-          <tr>
-            <td style="padding:28px 28px 20px;">
-              <table role="presentation" cellpadding="0" cellspacing="0" style="margin-bottom:18px;">
-                <tr>
-                  <td style="font-size:18px;font-weight:700;color:%s;">Vantage</td>
-                </tr>
-              </table>
-              <span style="display:inline-block;padding:4px 12px;border-radius:9999px;background:%s22;color:%s;font-size:12px;font-weight:600;letter-spacing:.02em;">%s</span>
-              <h1 style="margin:14px 0 6px;font-size:20px;font-weight:700;color:%s;">%s</h1>
-              <p style="margin:0 0 20px;color:%s;font-size:13px;">%s check</p>
-              %s
-              <table role="presentation" width="100%%" cellpadding="0" cellspacing="0" style="border-top:1px solid %s;">
-                %s
-                %s
-                %s
-              </table>
-            </td>
-          </tr>
-          <tr>
-            <td style="padding:16px 28px;border-top:1px solid %s;">
-              <p style="margin:0;color:%s;font-size:12px;">Sent by Vantage · self-hosted service monitoring</p>
-            </td>
-          </tr>
-        </table>
-      </td>
-    </tr>
-  </table>
-</body>
-</html>`,
-		colBg,
-		colBg,
-		colSurface, colBorder,
-		accent,
-		colText,
-		accent, accent, label,
-		colText, esc(ev.MonitorName),
-		colTextMuted, esc(ev.Type),
-		message,
-		colBorder,
-		row("Status", transition),
-		row("Type", ev.Type),
-		row("Time", ev.Time.Format("2006-01-02 15:04:05 MST")),
-		colBorder,
-		colTextMuted,
-	)
-}
-
-func textEmail(ev Event) string {
-	return strings.Join([]string{
-		ev.title(),
-		"",
-		"Monitor: " + ev.MonitorName,
-		"Type:    " + ev.Type,
-		"Status:  " + ev.OldStatus + " -> " + ev.NewStatus,
-		"Message: " + ev.Message,
-		"Time:    " + ev.Time.Format("2006-01-02 15:04:05 MST"),
-		"",
-		"Sent by Vantage · self-hosted service monitoring",
-	}, "\r\n")
-}