diff --git a/backend/vendor/github.com/go-pkgz/auth/logger/interface.go b/backend/vendor/github.com/go-pkgz/auth/logger/interface.go
new file mode 100644
index 00000000..d2a7f738
--- /dev/null
+++ b/backend/vendor/github.com/go-pkgz/auth/logger/interface.go
@@ -0,0 +1,19 @@
+package logger
+
+import "log"
+
+type L interface {
+	Logf(format string, args ...interface{})
+}
+
+// Func type is an adapter to allow the use of ordinary functions as Logger.
+type Func func(format string, args ...interface{})
+
+// Logf calls f(id)
+func (f Func) Logf(format string, args ...interface{}) { f(format, args...) }
+
+// NoOp logger
+var NoOp = Func(func(format string, args ...interface{}) {})
+
+// Std logger sends to std default logger directly
+var Std = Func(func(format string, args ...interface{}) { log.Printf(format, args...) })