feat: api serve frontend, build workflow, router readyness

api/handlers/frontend/frontHandler.go

@@ -0,0 +1,79 @@
+package frontend
+
+import (
+	"RenewCMS/internal/infrastructure/assets"
+	"io"
+	"io/fs"
+	"net/http"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+)
+
+type spaHandler struct {
+	staticFS fs.FS
+	modTime  time.Time
+}
+
+func NewFrontendRouter() http.Handler {
+	r := chi.NewRouter()
+
+	distFS, _ := fs.Sub(assets.DistEmbed, "dist")
+	handler := &spaHandler{
+		staticFS: distFS,
+		modTime:  time.Now(),
+	}
+
+	r.Get("/*", handler.ServeHTTP)
+	return r
+}
+
+func (h *spaHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	path := h.cleanPath(r.URL.Path)
+	if h.fileExists(path) {
+		h.serveAsset(w, r, path)
+		return
+	}
+	h.serveIndex(w, r)
+}
+
+func (h *spaHandler) cleanPath(path string) string {
+	return strings.TrimPrefix(filepath.Clean(path), "/")
+}
+
+func (h *spaHandler) fileExists(path string) bool {
+	if path == "" || path == "." {
+		return false
+	}
+	f, err := h.staticFS.Open(path)
+	if err != nil {
+		return false
+	}
+	defer f.Close()
+	return true
+}
+
+func (h *spaHandler) serveAsset(w http.ResponseWriter, r *http.Request, path string) {
+	w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
+	http.FileServer(http.FS(h.staticFS)).ServeHTTP(w, r)
+}
+
+func (h *spaHandler) serveIndex(w http.ResponseWriter, r *http.Request) {
+	f, err := h.staticFS.Open("index.html")
+	if err != nil {
+		http.Error(w, "Index not found", http.StatusNotFound)
+		return
+	}
+	defer f.Close()
+
+	content, ok := f.(io.ReadSeeker)
+	if !ok {
+		http.Error(w, "File not seekable", http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Cache-Control", "no-store, no-cache, must-revalidate")
+	http.ServeContent(w, r, "index.html", h.modTime, content)
+}