Initial QSfera import

Server/vendor/github.com/invopop/validation/not_in.go

@@ -0,0 +1,53 @@
+// Copyright 2018 Qiang Xue, Google LLC. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package validation
+
+import "reflect"
+
+// ErrNotInInvalid is the error that returns when a value is in a list.
+var ErrNotInInvalid = NewError("validation_not_in_invalid", "must not be in list")
+
+// NotIn returns a validation rule that checks if a value is absent from the given list of values.
+// Like with In(), reflect.DeepEqual() will be used to determine if two values are equal.
+// An empty value is considered valid. Use the Required rule to make sure a value is not empty.
+func NotIn[T any](values ...T) NotInRule[T] {
+	return NotInRule[T]{
+		elements: values,
+		err:      ErrNotInInvalid,
+	}
+}
+
+// NotInRule is a validation rule that checks if a value is absent from the given list of values.
+type NotInRule[T any] struct {
+	elements []T
+	err      Error
+}
+
+// Validate checks if the given value is valid or not.
+func (r NotInRule[T]) Validate(value interface{}) error {
+	value, isNil := Indirect(value)
+	if isNil || IsEmpty(value) {
+		return nil
+	}
+
+	for _, e := range r.elements {
+		if reflect.DeepEqual(e, value) {
+			return r.err
+		}
+	}
+	return nil
+}
+
+// Error sets the error message for the rule.
+func (r NotInRule[T]) Error(message string) NotInRule[T] {
+	r.err = r.err.SetMessage(message)
+	return r
+}
+
+// ErrorObject sets the error struct for the rule.
+func (r NotInRule[T]) ErrorObject(err Error) NotInRule[T] {
+	r.err = err
+	return r
+}