PWA: Include minimal no-op service worker for tests photoprism#5274

Signed-off-by: Michael Mayer <[email protected]>

Author: lastzero

internal/server/routes_webapp.go

@@ -2,6 +2,7 @@ package server
 
 import (
 	"net/http"
+	"os"
 	"path/filepath"
 
 	"github.com/gin-gonic/gin"
@@ -52,7 +53,20 @@ func registerWebAppRoutes(router *gin.Engine, conf *config.Config) {
 	// Serve user interface service worker file.
 	swWorker := func(c *gin.Context) {
 		c.Header(header.CacheControl, header.CacheControlNoStore)
-		c.File(filepath.Join(conf.BuildPath(), "sw.js"))
+
+		if swBuildPath := filepath.Join(conf.BuildPath(), "sw.js"); swBuildPath != "" {
+			if _, err := os.Stat(swBuildPath); err == nil {
+				c.File(swBuildPath)
+				return
+			}
+		}
+
+		if len(fallbackServiceWorker) > 0 {
+			c.Data(http.StatusOK, "application/javascript", fallbackServiceWorker)
+			return
+		}
+
+		c.Status(http.StatusNotFound)
 	}
 	router.Any("/sw.js", swWorker)
 

internal/server/sw_fallback.go

@@ -0,0 +1,10 @@
+package server
+
+import _ "embed"
+
+// fallbackServiceWorker contains a minimal no-op service worker used when a
+// Workbox-generated sw.js is not available (for example during tests or when
+// frontend assets have not been built yet).
+//
+//go:embed sw_fallback.js
+var fallbackServiceWorker []byte

internal/server/sw_fallback.js

@@ -0,0 +1,14 @@
+// Minimal fallback service worker served during development and tests.
+// Production builds replace this handler with the Workbox-generated sw.js.
+self.addEventListener("install", (event) => {
+  self.skipWaiting();
+});
+
+self.addEventListener("activate", (event) => {
+  event.waitUntil(self.clients.claim());
+});
+
+self.addEventListener("fetch", () => {
+  // Default network-first behaviour; caching is delegated to the
+  // Workbox-generated service worker in production builds.
+});