implemented extended gql errors

internal/errors.go

@@ -0,0 +1,25 @@
+package s3browser
+
+import "fmt"
+
+type extendedError struct {
+	Message string
+	Code    string
+}
+
+func (err *extendedError) Error() string {
+	return err.Message
+}
+
+func (err *extendedError) Extensions() map[string]interface{} {
+	return map[string]interface{}{
+		"code": err.Code,
+	}
+}
+
+func extendError(code, format string, a ...interface{}) *extendedError {
+	return &extendedError{
+		Message: fmt.Sprintf(format, a...),
+		Code:    code,
+	}
+}

internal/helper.go

@@ -114,12 +114,12 @@ func isAuth(ctx context.Context) (bool, error) {
 	token, ok := ctx.Value("jwt").(*jwt.Token)
 
 	if !ok {
-		return false, fmt.Errorf("Unauthorized")
+		return false, extendError("UNAUTHORIZED", "Unauthorized")
 	}
 
 	if token.Valid {
 		return true, nil
 	} else {
-		return false, fmt.Errorf("Unauthorized")
+		return false, extendError("UNAUTHORIZED", "Unauthorized")
 	}
 }