feat(http): handle html5 routing

ref #5

pkg/http/handler.go

@@ -59,7 +59,7 @@ func (h *Handler) Load(bdle bundle.Bundle) error {
 	}
 
 	fs := bundle.NewFileSystem("public", bdle)
-	public := http.FileServer(fs)
+	public := HTML5Fileserver(fs)
 	sockjs := sockjs.NewHandler(sockJSPathPrefix, h.sockjsOpts, h.handleSockJSSession)
 
 	if h.server != nil {

pkg/http/html5_fileserver.go

@@ -0,0 +1,54 @@
+package http
+
+import (
+	"net/http"
+	"os"
+	"path"
+	"strings"
+
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/logger"
+)
+
+func HTML5Fileserver(fs http.FileSystem) http.Handler {
+	handler := http.FileServer(fs)
+
+	fn := func(w http.ResponseWriter, r *http.Request) {
+		urlPath := r.URL.Path
+		if !strings.HasPrefix(urlPath, "/") {
+			urlPath = "/" + urlPath
+			r.URL.Path = urlPath
+		}
+		urlPath = path.Clean(urlPath)
+
+		file, err := fs.Open(urlPath)
+		if err != nil {
+			if errors.Is(err, os.ErrNotExist) {
+				r.URL.Path = "/"
+
+				handler.ServeHTTP(w, r)
+
+				return
+			}
+
+			logger.Error(r.Context(), "could not open bundle file", logger.E(err))
+
+			http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+			return
+		}
+
+		defer func() {
+			if err := file.Close(); err != nil {
+				logger.Error(r.Context(), "could not close file", logger.E(err))
+
+				http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+
+				return
+			}
+		}()
+
+		handler.ServeHTTP(w, r)
+	}
+
+	return http.HandlerFunc(fn)
+}