docker/homeassistant: Update frontend handler to serve static files from embedded FS

frontend/handler.go

@@ -0,0 +1,48 @@
+package frontend
+
+import (
+	"embed"
+	"io/fs"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+//go:embed dist
+var embeddedFiles embed.FS
+
+type Handler struct {
+}
+
+func NewHandler() *Handler {
+	return &Handler{}
+}
+
+func Routes(router *gin.Engine, h *Handler) {
+
+	router.Use(staticMiddleware("dist"))
+	router.Static("/assets", "dist/assets")
+
+	// Gzip compression middleware
+	router.Group("/assets").Use(func(c *gin.Context) {
+		c.Header("Cache-Control", "max-age=31536000, immutable")
+		c.Next()
+	})
+
+}
+
+func staticMiddleware(root string) gin.HandlerFunc {
+	fileServer := http.FileServer(getFileSystem(root))
+
+	return func(c *gin.Context) {
+		fileServer.ServeHTTP(c.Writer, c.Request)
+	}
+}
+
+func getFileSystem(path string) http.FileSystem {
+	fs, err := fs.Sub(embeddedFiles, path)
+	if err != nil {
+		panic(err)
+	}
+	return http.FS(fs)
+}