more updates

Former-commit-id: 8c19eda25f60e0fc5587dde8c19a8428befc3e0d

utils.go

@@ -0,0 +1,58 @@
+package filemanager
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"html/template"
+	"log"
+	"net/http"
+	"os"
+	"reflect"
+)
+
+// defined checks if variable is defined in a struct
+func defined(data interface{}, field string) bool {
+	t := reflect.Indirect(reflect.ValueOf(data)).Type()
+
+	if t.Kind() != reflect.Struct {
+		log.Print("Non-struct type not allowed.")
+		return false
+	}
+
+	_, b := t.FieldByName(field)
+	return b
+}
+
+// css returns the sanitized and safe css
+func css(s string) template.CSS {
+	return template.CSS(s)
+}
+
+// marshal converts an interface to json and sanitizes it
+func marshal(v interface{}) template.JS {
+	a, _ := json.Marshal(v)
+	return template.JS(a)
+}
+
+// encodeBase64 encodes a string in base 64
+func encodeBase64(s string) string {
+	return base64.StdEncoding.EncodeToString([]byte(s))
+}
+
+// errorToHTTPCode converts errors to HTTP Status Code.
+func errorToHTTPCode(err error, gone bool) int {
+	switch {
+	case os.IsPermission(err):
+		return http.StatusForbidden
+	case os.IsNotExist(err):
+		if !gone {
+			return http.StatusNotFound
+		}
+
+		return http.StatusGone
+	case os.IsExist(err):
+		return http.StatusGone
+	default:
+		return http.StatusInternalServerError
+	}
+}