move some stuff

utils/errors/errors.go

@@ -0,0 +1,23 @@
+package errors
+
+import (
+	"net/http"
+	"os"
+)
+
+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
+	}
+}