feat: complete cmpp platform phases 0-5

gateway/internal/health/server.go

@@ -0,0 +1,26 @@
+package health
+
+import (
+	"encoding/json"
+	"net/http"
+	"time"
+)
+
+type Status struct {
+	Status    string `json:"status"`
+	Service   string `json:"service"`
+	Timestamp string `json:"timestamp"`
+}
+
+func Handler() http.Handler {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(Status{
+			Status:    "ok",
+			Service:   "cmpp-gateway",
+			Timestamp: time.Now().UTC().Format(time.RFC3339Nano),
+		})
+	})
+	return mux
+}

gateway/internal/health/server_test.go

@@ -0,0 +1,31 @@
+package health
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestHealthHandler(t *testing.T) {
+	server := httptest.NewServer(Handler())
+	defer server.Close()
+
+	response, err := http.Get(server.URL + "/health")
+	if err != nil {
+		t.Fatalf("get health: %v", err)
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		t.Fatalf("unexpected status: %d", response.StatusCode)
+	}
+
+	var payload Status
+	if err := json.NewDecoder(response.Body).Decode(&payload); err != nil {
+		t.Fatalf("decode health payload: %v", err)
+	}
+	if payload.Status != "ok" || payload.Service != "cmpp-gateway" {
+		t.Fatalf("unexpected payload: %+v", payload)
+	}
+}