Merge pull request 'feat(webhook): Forgejo → Gotify notification bridge' (#29) from feat/forgejo-gotify-webhook into main

internal/server/router.go

@@ -4,6 +4,7 @@ import (
 	"net/http"
 
 	"forgejo.riotpiao.com/rock/homelab-frontend/internal/serviceadapter"
+	"forgejo.riotpiao.com/rock/homelab-frontend/internal/webhook"
 )
 
 // Router implements an HTTP handler that routes health endpoints,
@@ -14,6 +15,7 @@ type Router struct {
 	dispatcher        *serviceadapter.Dispatcher
 	temporalHandler   http.Handler
 	upstreamHandler   http.Handler
+	forgejoWebhook    *webhook.ForgejoHandler
 }
 
 // NewRouter creates a new router with health endpoints.
@@ -23,10 +25,11 @@ type Router struct {
 // All other paths are passed to the upstream handler.
 func NewRouter(healthChecker *HealthChecker, dispatcher *serviceadapter.Dispatcher, temporalHandler http.Handler, upstreamHandler http.Handler) *Router {
 	return &Router{
-		healthChecker:   healthChecker,
-		dispatcher:      dispatcher,
+		healthChecker:  healthChecker,
+		dispatcher:     dispatcher,
 		temporalHandler: temporalHandler,
 		upstreamHandler: upstreamHandler,
+		forgejoWebhook: webhook.NewForgejoHandler(),
 	}
 }
 
@@ -57,6 +60,12 @@ func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 		}
 	}
 
+	// Forgejo webhook receiver — no auth, HMAC-verified by handler
+	if req.URL.Path == "/v1/webhooks/forgejo" {
+		r.forgejoWebhook.ServeHTTP(w, req)
+		return
+	}
+
 	// Workflow endpoints
 	// DEPRECATED: Path-based /workflow routing is legacy.
 	// New clients should use X-Service: workflow header instead for consistent auth.

internal/webhook/forgejo.go

@@ -0,0 +1,218 @@
+package webhook
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+
+	"forgejo.riotpiao.com/rock/homelab-frontend/internal/notification"
+)
+
+// ForgejoHandler receives Forgejo webhook payloads and forwards them to Gotify.
+// Forgejo sends a Gitea-compatible JSON payload with X-Gitea-Signature-256 header.
+type ForgejoHandler struct {
+	secret string
+	gotify *notification.GotifyClient
+}
+
+// NewForgejoHandler creates a handler from environment variables.
+// Required: GOTIFY_URL, GOTIFY_APP_TOKEN
+// Optional: FORGEJO_WEBHOOK_SECRET (if empty, HMAC verification is skipped)
+func NewForgejoHandler() *ForgejoHandler {
+	gotifyURL := os.Getenv("GOTIFY_URL")
+	appToken := os.Getenv("GOTIFY_APP_TOKEN")
+
+	var client *notification.GotifyClient
+	if gotifyURL != "" && appToken != "" {
+		client = notification.NewGotifyClient(gotifyURL, appToken, "")
+	}
+
+	return &ForgejoHandler{
+		secret: os.Getenv("FORGEJO_WEBHOOK_SECRET"),
+		gotify: client,
+	}
+}
+
+// ServeHTTP handles POST /v1/webhooks/forgejo
+func (h *ForgejoHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	body, err := io.ReadAll(io.LimitReader(r.Body, 1<<20)) // 1MB limit
+	if err != nil {
+		http.Error(w, "failed to read body", http.StatusBadRequest)
+		return
+	}
+
+	// Verify HMAC if secret is set
+	if h.secret != "" {
+		sig := r.Header.Get("X-Gitea-Signature-256")
+		if sig == "" {
+			sig = r.Header.Get("X-Hub-Signature-256")
+		}
+		if !h.verifySignature(body, sig) {
+			http.Error(w, "invalid signature", http.StatusForbidden)
+			return
+		}
+	}
+
+	if h.gotify == nil {
+		log.Printf("forgejo webhook received but Gotify not configured (GOTIFY_URL/GOTIFY_APP_TOKEN missing)")
+		w.WriteHeader(http.StatusOK)
+		return
+	}
+
+	event := r.Header.Get("X-Gitea-Event")
+	if event == "" {
+		event = r.Header.Get("X-GitHub-Event")
+	}
+
+	title, message, priority := h.formatMessage(event, body)
+	if title == "" {
+		// Unhandled event type — ack and ignore
+		w.WriteHeader(http.StatusOK)
+		return
+	}
+
+	msg := notification.GotifyMessage{
+		Title:    title,
+		Message:  message,
+		Priority: priority,
+	}
+
+	if _, err := h.gotify.SendMessage(msg); err != nil {
+		log.Printf("forgejo webhook: failed to send gotify message: %v", err)
+		http.Error(w, "failed to send notification", http.StatusBadGateway)
+		return
+	}
+
+	log.Printf("forgejo webhook: sent gotify notification event=%s title=%q", event, title)
+	w.WriteHeader(http.StatusOK)
+}
+
+// verifySignature checks X-Gitea-Signature-256: sha256=<hex>
+func (h *ForgejoHandler) verifySignature(body []byte, sig string) bool {
+	sig = strings.TrimPrefix(sig, "sha256=")
+	if sig == "" {
+		return false
+	}
+	mac := hmac.New(sha256.New, []byte(h.secret))
+	mac.Write(body)
+	expected := hex.EncodeToString(mac.Sum(nil))
+	return hmac.Equal([]byte(sig), []byte(expected))
+}
+
+// formatMessage converts a Forgejo event payload into a Gotify title + message.
+// Returns empty title if the event should be ignored.
+func (h *ForgejoHandler) formatMessage(event string, body []byte) (title, message string, priority int) {
+	var payload map[string]interface{}
+	if err := json.Unmarshal(body, &payload); err != nil {
+		return "", "", 0
+	}
+
+	repo := jsonStr(payload, "repository", "full_name")
+	sender := jsonStr(payload, "sender", "login")
+
+	switch event {
+	case "push":
+		ref := strings.TrimPrefix(fmt.Sprintf("%v", payload["ref"]), "refs/heads/")
+		commits, _ := payload["commits"].([]interface{})
+		count := len(commits)
+		commitMsg := ""
+		if count > 0 {
+			if c, ok := commits[0].(map[string]interface{}); ok {
+				commitMsg = fmt.Sprintf("%v", c["message"])
+				// truncate long commit messages
+				if len(commitMsg) > 80 {
+					commitMsg = commitMsg[:80] + "…"
+				}
+			}
+		}
+		return fmt.Sprintf("📦 %s", repo),
+			fmt.Sprintf("%s pushed %d commit(s) to %s\n%s", sender, count, ref, commitMsg),
+			5
+
+	case "pull_request":
+		action := fmt.Sprintf("%v", payload["action"])
+		if action != "opened" && action != "closed" && action != "reopened" && action != "merged" {
+			return "", "", 0 // ignore noise (labeled, assigned, etc.)
+		}
+		pr, _ := payload["pull_request"].(map[string]interface{})
+		number := fmt.Sprintf("%v", pr["number"])
+		prTitle := fmt.Sprintf("%v", pr["title"])
+		merged, _ := pr["merged"].(bool)
+		if action == "closed" && merged {
+			action = "merged"
+		}
+		return fmt.Sprintf("🔀 PR #%s %s — %s", number, action, repo),
+			fmt.Sprintf("%s: %s\nby %s", action, prTitle, sender),
+			5
+
+	case "issues":
+		action := fmt.Sprintf("%v", payload["action"])
+		if action != "opened" && action != "closed" && action != "reopened" {
+			return "", "", 0
+		}
+		issue, _ := payload["issue"].(map[string]interface{})
+		number := fmt.Sprintf("%v", issue["number"])
+		issueTitle := fmt.Sprintf("%v", issue["title"])
+		return fmt.Sprintf("🐛 Issue #%s %s — %s", number, action, repo),
+			fmt.Sprintf("%s: %s\nby %s", action, issueTitle, sender),
+			4
+
+	case "issue_comment", "pull_request_review_comment":
+		issue, _ := payload["issue"].(map[string]interface{})
+		comment, _ := payload["comment"].(map[string]interface{})
+		number := fmt.Sprintf("%v", issue["number"])
+		body := fmt.Sprintf("%v", comment["body"])
+		if len(body) > 100 {
+			body = body[:100] + "…"
+		}
+		return fmt.Sprintf("💬 Comment on #%s — %s", number, repo),
+			fmt.Sprintf("%s: %s", sender, body),
+			3
+
+	case "release":
+		action := fmt.Sprintf("%v", payload["action"])
+		if action != "published" {
+			return "", "", 0
+		}
+		release, _ := payload["release"].(map[string]interface{})
+		tag := fmt.Sprintf("%v", release["tag_name"])
+		name := fmt.Sprintf("%v", release["name"])
+		return fmt.Sprintf("🚀 Release %s — %s", tag, repo),
+			fmt.Sprintf("%s published by %s", name, sender),
+			7
+
+	default:
+		return "", "", 0
+	}
+}
+
+// jsonStr safely traverses nested map keys.
+func jsonStr(m map[string]interface{}, keys ...string) string {
+	cur := m
+	for i, k := range keys {
+		v, ok := cur[k]
+		if !ok {
+			return ""
+		}
+		if i == len(keys)-1 {
+			return fmt.Sprintf("%v", v)
+		}
+		cur, ok = v.(map[string]interface{})
+		if !ok {
+			return ""
+		}
+	}
+	return ""
+}

k8s/deployment.yaml

@@ -76,6 +76,22 @@ spec:
           value: "1.0.0"
         - name: OTEL_ENVIRONMENT
           value: "production"
+        # Gotify integration — Forgejo webhook → push notifications
+        - name: GOTIFY_URL
+          valueFrom:
+            secretKeyRef:
+              name: gotify-webhook-secret
+              key: gotify-url
+        - name: GOTIFY_APP_TOKEN
+          valueFrom:
+            secretKeyRef:
+              name: gotify-webhook-secret
+              key: gotify-app-token
+        - name: FORGEJO_WEBHOOK_SECRET
+          valueFrom:
+            secretKeyRef:
+              name: gotify-webhook-secret
+              key: forgejo-webhook-secret
         volumeMounts:
         - name: config
           mountPath: /etc/gateway