test: cover launcher setup csrf guard

web/backend/api/auth_csrf_test.go

@@ -0,0 +1,63 @@
+package api
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func TestLauncherAuthSetupRejectsCrossSiteFirstRun(t *testing.T) {
+	store := &fakePasswordStore{}
+	mux := http.NewServeMux()
+	RegisterLauncherAuthRoutes(mux, LauncherAuthRouteOpts{
+		SessionCookie: "session-cookie-value",
+		PasswordStore: store,
+	})
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(
+		http.MethodPost,
+		"http://127.0.0.1:18800/api/auth/setup",
+		strings.NewReader(`{"password":"CrossSitePwn123!","confirm":"CrossSitePwn123!"}`),
+	)
+	req.Header.Set("Origin", "https://evil.example")
+	req.Header.Set("Referer", "https://evil.example/attack")
+	req.Header.Set("Sec-Fetch-Site", "cross-site")
+	req.Header.Set("Content-Type", "application/json")
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusForbidden {
+		t.Fatalf("cross-site setup code = %d body=%s", rec.Code, rec.Body.String())
+	}
+	if store.initialized || store.password != "" {
+		t.Fatalf("cross-site setup mutated store: initialized=%v password=%q", store.initialized, store.password)
+	}
+}
+
+func TestLauncherAuthSetupAllowsSameOriginFirstRun(t *testing.T) {
+	store := &fakePasswordStore{}
+	mux := http.NewServeMux()
+	RegisterLauncherAuthRoutes(mux, LauncherAuthRouteOpts{
+		SessionCookie: "session-cookie-value",
+		PasswordStore: store,
+	})
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(
+		http.MethodPost,
+		"http://127.0.0.1:18800/api/auth/setup",
+		strings.NewReader(`{"password":"LocalSetup123!","confirm":"LocalSetup123!"}`),
+	)
+	req.Header.Set("Origin", "http://127.0.0.1:18800")
+	req.Header.Set("Sec-Fetch-Site", "same-origin")
+	req.Header.Set("Content-Type", "application/json")
+	mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("same-origin setup code = %d body=%s", rec.Code, rec.Body.String())
+	}
+	if !store.initialized || store.password != "LocalSetup123!" {
+		t.Fatalf("same-origin setup store: initialized=%v password=%q", store.initialized, store.password)
+	}
+}