show ramdom background image

frontend/src/pages/home_page.tsx

@@ -7,6 +7,7 @@ import { useTranslation } from "../utils/i18n";
 import { useAppContext } from "../components/AppContext.tsx";
 import Select from "../components/select.tsx";
 import { useNavigate } from "react-router";
+import { useNavigator } from "../components/navigator.tsx";
 
 export default function HomePage() {
   useEffect(() => {
@@ -65,6 +66,7 @@ let cachedPinnedResources: Resource[] | null = null;
 
 function PinnedResources() {
   const [pinnedResources, setPinnedResources] = useState<Resource[]>([]);
+  const navigator = useNavigator();
 
   useEffect(() => {
     if (cachedPinnedResources != null) {
@@ -72,6 +74,9 @@ function PinnedResources() {
       return;
     }
     const prefetchData = app.getPreFetchData();
+    if (prefetchData && prefetchData.background) {
+      navigator.setBackground(network.getResampledImageUrl(prefetchData.background));
+    }
     if (prefetchData && prefetchData.pinned) {
       cachedPinnedResources = prefetchData.pinned;
       setPinnedResources(cachedPinnedResources!);

server/middleware/frontend_middleware.go

@@ -157,9 +157,11 @@ func serveIndexHtml(c fiber.Ctx) error {
 		}
 	} else if path == "/" || path == "" {
 		pinned, err := service.GetPinnedResources()
-		if err == nil {
+		random, err1 := service.RandomCover()
+		if err == nil && err1 == nil {
 			preFetchDataJson, _ := json.Marshal(map[string]interface{}{
 				"pinned":     pinned,
+				"background": random,
 			})
 			preFetchData = url.PathEscape(string(preFetchDataJson))
 		}

server/service/resource.go

@@ -288,6 +288,22 @@ func RandomResource(host string) (*model.ResourceDetailView, error) {
 	return &v, nil
 }
 
+var lastSuccessCover uint
+
+func RandomCover() (uint, error) {
+	for retries := 0; retries < 5; retries++ {
+		v, err := dao.RandomResource()
+		if err != nil {
+			return 0, err
+		}
+		if len(v.Images) > 0 {
+			lastSuccessCover = v.Images[0].ID
+			return v.Images[0].ID, nil
+		}
+	}
+	return lastSuccessCover, nil
+}
+
 func GetPinnedResources() ([]model.ResourceView, error) {
 	ids := config.PinnedResources()
 	var views []model.ResourceView