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Commits
| Author | SHA1 | Date | |
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 mrhid6
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19b4aef95b |
@@ -79,24 +79,16 @@ func dispatchSMTP(ch models.NotificationChannel, ev Event) error {
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}
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}
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title := ev.title()
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msg := strings.Join([]string{
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"From: " + from,
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"To: " + to,
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"Subject: " + title,
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"",
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title,
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"",
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"Monitor: " + ev.MonitorName,
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"Status: " + ev.OldStatus + " -> " + ev.NewStatus,
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"Time: " + ev.Time.String(),
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}, "\r\n")
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msg, err := buildMIME(from, to, ev.title(), textEmail(ev), htmlEmail(ev))
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if err != nil {
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return fmt.Errorf("smtp: build message: %w", err)
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}
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w, err := c.Data()
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if err != nil {
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return fmt.Errorf("smtp: data: %w", err)
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}
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if _, err := w.Write([]byte(msg)); err != nil {
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if _, err := w.Write(msg); err != nil {
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return fmt.Errorf("smtp: write: %w", err)
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}
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if err := w.Close(); err != nil {
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@@ -0,0 +1,167 @@
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package notify
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import (
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"fmt"
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"html"
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"mime/multipart"
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"net/textproto"
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"strings"
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"github.com/mrhid6/vantage/server/internal/models"
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)
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// App theme colors (mirrors web/tailwind.config.ts).
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const (
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colBg = "#0f1117"
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colSurface = "#1a1d27"
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colSurface2 = "#232635"
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colBorder = "#2e3147"
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colText = "#e8eaf0"
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colTextMuted = "#9095a8"
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colAccent = "#6366f1"
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colSuccess = "#22c55e"
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colDanger = "#ef4444"
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)
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// statusColor returns the accent color for a monitor status.
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func statusColor(status string) string {
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switch status {
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case models.StatusUp:
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return colSuccess
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case models.StatusDown:
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return colDanger
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default:
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return colTextMuted
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}
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}
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// buildMIME assembles a multipart/alternative message (plain + HTML) with the
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// standard email headers, ready to hand to the SMTP DATA command.
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func buildMIME(from, to, subject, text, htmlBody string) ([]byte, error) {
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var buf strings.Builder
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w := multipart.NewWriter(&buf)
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var head strings.Builder
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head.WriteString("From: " + from + "\r\n")
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head.WriteString("To: " + to + "\r\n")
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head.WriteString("Subject: " + subject + "\r\n")
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head.WriteString("MIME-Version: 1.0\r\n")
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head.WriteString(fmt.Sprintf("Content-Type: multipart/alternative; boundary=%s\r\n\r\n", w.Boundary()))
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textPart, err := w.CreatePart(textproto.MIMEHeader{"Content-Type": {"text/plain; charset=UTF-8"}})
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if err != nil {
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return nil, err
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}
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textPart.Write([]byte(text))
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htmlPart, err := w.CreatePart(textproto.MIMEHeader{"Content-Type": {"text/html; charset=UTF-8"}})
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if err != nil {
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return nil, err
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}
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htmlPart.Write([]byte(htmlBody))
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if err := w.Close(); err != nil {
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return nil, err
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}
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return []byte(head.String() + buf.String()), nil
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}
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// htmlEmail renders the alert as a dark-themed HTML email matching the app.
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func htmlEmail(ev Event) string {
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accent := statusColor(ev.NewStatus)
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label := "Recovered"
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if ev.NewStatus == models.StatusDown {
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label = "Down"
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}
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esc := html.EscapeString
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row := func(k, v string) string {
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if v == "" {
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v = "—"
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}
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return fmt.Sprintf(
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`<tr>`+
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`<td style="padding:8px 0;color:%s;font-size:13px;width:120px;">%s</td>`+
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`<td style="padding:8px 0;color:%s;font-size:13px;font-weight:500;">%s</td>`+
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`</tr>`,
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colTextMuted, k, colText, esc(v))
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}
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message := ""
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if ev.Message != "" {
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message = fmt.Sprintf(
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`<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>`,
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colSurface2, colBorder, colText, esc(ev.Message))
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}
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transition := esc(ev.OldStatus) + " → " + esc(ev.NewStatus)
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return fmt.Sprintf(`<!DOCTYPE html>
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<html>
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<body style="margin:0;padding:0;background:%s;">
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<table role="presentation" width="100%%" cellpadding="0" cellspacing="0" style="background:%s;padding:32px 0;">
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<tr>
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<td align="center">
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<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;">
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<tr><td style="height:4px;background:%s;"></td></tr>
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<tr>
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<td style="padding:28px 28px 20px;">
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<table role="presentation" cellpadding="0" cellspacing="0" style="margin-bottom:18px;">
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<tr>
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<td style="font-size:18px;font-weight:700;color:%s;">Vantage</td>
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</tr>
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</table>
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<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>
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<h1 style="margin:14px 0 6px;font-size:20px;font-weight:700;color:%s;">%s</h1>
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<p style="margin:0 0 20px;color:%s;font-size:13px;">%s check</p>
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%s
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<table role="presentation" width="100%%" cellpadding="0" cellspacing="0" style="border-top:1px solid %s;">
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%s
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%s
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%s
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</table>
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</td>
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</tr>
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<tr>
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<td style="padding:16px 28px;border-top:1px solid %s;">
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<p style="margin:0;color:%s;font-size:12px;">Sent by Vantage · self-hosted service monitoring</p>
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</td>
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</tr>
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</table>
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</td>
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</tr>
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</table>
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</body>
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</html>`,
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colBg,
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colBg,
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colSurface, colBorder,
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accent,
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colText,
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accent, accent, label,
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colText, esc(ev.MonitorName),
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colTextMuted, esc(ev.Type),
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message,
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colBorder,
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row("Status", transition),
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row("Type", ev.Type),
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row("Time", ev.Time.Format("2006-01-02 15:04:05 MST")),
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colBorder,
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colTextMuted,
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)
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}
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// textEmail renders the plain-text fallback.
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func textEmail(ev Event) string {
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return strings.Join([]string{
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ev.title(),
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"",
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"Monitor: " + ev.MonitorName,
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"Type: " + ev.Type,
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"Status: " + ev.OldStatus + " -> " + ev.NewStatus,
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"Message: " + ev.Message,
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"Time: " + ev.Time.Format("2006-01-02 15:04:05 MST"),
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"",
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"Sent by Vantage · self-hosted service monitoring",
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}, "\r\n")
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}
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