Rewrite the service in Go and ship it as a static container

The PHP app, Apache, and .htaccess are replaced by a single Go binary (standard library only). Routing, the JSON response, the landing page, the shared email design, and all four parsers are ported with the same output; JSON object keys are kept in sender order via an ordered decoder. - mail.go: SMTP delivery with quoted-printable body and RFC 2047 subject - main.go: routing, client IP from the proxy, /healthz, -check flag - render.go: email shell, escaping, table helpers, generic renderer - parser_*.go: github, grafana, json, wxinteract - main_test.go: handler, response shape, IP forwarding, every parser - Dockerfile: multi-stage build to distroless static, non-root, HEALTHCHECK - deploy/webhooks.dixon.cx.service: systemd unit for the container - README and PARSER_PROMPT updated for Go; IMPLEMENTATION_SUMMARY removed
2026-09-12 19:59:54 +01:00
parent a61da1f6e3
commit 2d0f98e041
26 changed files with 1739 additions and 2301 deletions
@@ -0,0 +1,125 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+// grafanaParse formats Grafana / Prometheus Alertmanager webhook payloads.
+func grafanaParse(raw []byte, headers http.Header, meta Meta) (string, string, bool) {
+	v, err := decodeJSON(raw)
+	payload := asObject(v)
+	if err != nil || payload.Len() == 0 {
+		return "", "", false
+	}
+
+	status := strOr(payload.Get("status"), "unknown")
+	receiver := strOr(payload.Get("receiver"), "Unknown")
+	externalURL := strOr(payload.Get("externalURL"), "")
+	alerts, _ := payload.Get("alerts").([]any)
+	truncated := num(payload.Get("truncatedAlerts"))
+
+	icon, color := statusStyle(status, "🚨")
+
+	// Summary
+	rows := []string{
+		row("Status", `<strong style="color: `+color+`;">`+icon+" "+h(status)+`</strong>`),
+		row("Receiver", h(receiver)),
+		row("Alert Count", fmt.Sprint(len(alerts))),
+	}
+	if truncated > 0 {
+		rows = append(rows, row("Truncated Alerts", fmt.Sprint(int(truncated))))
+	}
+	if externalURL != "" {
+		rows = append(rows, row("Alertmanager URL", link(externalURL)))
+	}
+	body := section("Alert Summary", table(rows...))
+
+	// Labels
+	groupLabels := asObject(payload.Get("groupLabels"))
+	commonLabels := asObject(payload.Get("commonLabels"))
+	if groupLabels.Len() > 0 || commonLabels.Len() > 0 {
+		var b strings.Builder
+		if groupLabels.Len() > 0 {
+			b.WriteString(`<div class="subsection-title">Group Labels</div>` + kvTable(groupLabels))
+		}
+		if commonLabels.Len() > 0 {
+			b.WriteString(`<div class="subsection-title">Common Labels</div>` + kvTable(commonLabels))
+		}
+		body += section("Labels", b.String())
+	}
+
+	// Common annotations
+	if ca := asObject(payload.Get("commonAnnotations")); ca.Len() > 0 {
+		body += section("Common Annotations", kvTable(ca))
+	}
+
+	// Individual alerts
+	if len(alerts) > 0 {
+		var b strings.Builder
+		for i, a := range alerts {
+			al := asObject(a)
+			aStatus := strOr(al.Get("status"), "unknown")
+			aIcon, aColor := statusStyle(aStatus, "🔥")
+			b.WriteString(`<div class="array-item"><div class="array-item-title">` + aIcon + " Alert " + fmt.Sprint(i+1) +
+				` - <span style="color: ` + aColor + `;">` + h(aStatus) + `</span></div>`)
+			if l := asObject(al.Get("labels")); l.Len() > 0 {
+				b.WriteString(`<div class="subsection-title">Labels</div>` + kvTable(l))
+			}
+			if an := asObject(al.Get("annotations")); an.Len() > 0 {
+				b.WriteString(`<div class="subsection-title">Annotations</div>` + kvTable(an))
+			}
+			var extra []string
+			if s := strOr(al.Get("startsAt"), ""); s != "" {
+				extra = append(extra, row("Started At", h(s)))
+			}
+			if s := strOr(al.Get("endsAt"), ""); s != "" {
+				extra = append(extra, row("Ended At", h(s)))
+			}
+			if s := strOr(al.Get("generatorURL"), ""); s != "" {
+				extra = append(extra, row("Generator URL", link(s)))
+			}
+			if s := strOr(al.Get("fingerprint"), ""); s != "" {
+				extra = append(extra, row("Fingerprint", h(s)))
+			}
+			if len(extra) > 0 {
+				b.WriteString(table(extra...))
+			}
+			b.WriteString(`</div>`)
+		}
+		body += section("Alerts", b.String())
+	}
+
+	body += section("📋 Request Information", table(
+		row("Receiver", h(receiver)),
+		row("IP Address", h(meta.IP)),
+	))
+
+	html := emailShell(icon+" Grafana Alert: "+h(status), h(meta.Date), body,
+		"This Grafana/Prometheus alert was automatically forwarded to your email address.")
+	count := "1 alert"
+	if len(alerts) != 1 {
+		count = fmt.Sprintf("%d alerts", len(alerts))
+	}
+	return html, fmt.Sprintf("%s Grafana Alert: %s - %s", icon, status, count), true
+}
+
+func statusStyle(status, firingIcon string) (icon, color string) {
+	switch status {
+	case "firing":
+		return firingIcon, "#dc3545"
+	case "resolved":
+		return "✅", "#28a745"
+	}
+	return "🔔", "#666666"
+}
+
+// kvTable renders an object of scalar values as a label/value table.
+func kvTable(m *OMap) string {
+	rows := make([]string, 0, m.Len())
+	for _, k := range m.Keys {
+		rows = append(rows, row(h(k), esc(str(m.M[k]))))
+	}
+	return table(rows...)
+}