Move over to Go embed directive

core/asset/assets.go

@@ -0,0 +1,70 @@
+package asset
+
+import (
+	"embed"
+	"errors"
+	"io"
+	"io/fs"
+	"mime"
+	"net/http"
+	"path"
+	"path/filepath"
+)
+
+// GetPublicFileSystem
+func GetPublicFileSystem(e embed.FS) (hfs http.FileSystem, err error) {
+	fsys, err := fs.Sub(e, "static/public")
+	if err != nil {
+		return nil, errors.New("failed GetPublicFileSystem")
+	}
+
+	return http.FS(fsys), nil
+}
+
+// FetchStatic loads static asset from embed file system.
+func FetchStatic(e embed.FS, filename string) (content, contentType string, err error) {
+	data, err := e.ReadFile("static/" + filename)
+	if err != nil {
+		return
+	}
+
+	contentType = mime.TypeByExtension(filepath.Ext(filename))
+	content = string(data)
+
+	return
+}
+
+// FetchStaticDir returns filenames within specified directory
+func FetchStaticDir(fs embed.FS, directory string) (files []string, err error) {
+	entries, err := fs.ReadDir("static/" + directory)
+	if err != nil {
+		return
+	}
+
+	for i := range entries {
+		if !entries[i].Type().IsDir() {
+			files = append(files, entries[i].Name())
+		}
+	}
+
+	return files, nil
+}
+
+// WriteStatic loads static asset from embed file system and writes to HTTP.
+func WriteStatic(fs embed.FS, prefix, requestedPath string, w http.ResponseWriter) error {
+	f, err := fs.Open(path.Join(prefix, requestedPath))
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	stat, _ := f.Stat()
+	if stat.IsDir() {
+		return errors.New("cannot write static file")
+	}
+
+	contentType := mime.TypeByExtension(filepath.Ext(requestedPath))
+	w.Header().Set("Content-Type", contentType)
+	_, err = io.Copy(w, f)
+	return err
+}