New structure (#7)

pkg/models/user_right.go

@@ -0,0 +1,27 @@
+package models
+
+// UserRight defines the rights users can have for lists/namespaces
+type UserRight int
+
+// define unknown user right
+const (
+	UserRightUnknown = -1
+)
+
+// Enumerate all the user rights
+const (
+	// Can read lists in a User
+	UserRightRead UserRight = iota
+	// Can write tasks in a User like lists and todo tasks. Cannot create new lists.
+	UserRightWrite
+	// Can manage a list/namespace, can do everything
+	UserRightAdmin
+)
+
+func (r UserRight) isValid() error {
+	if r != UserRightAdmin && r != UserRightRead && r != UserRightWrite {
+		return ErrInvalidUserRight{r}
+	}
+
+	return nil
+}