Initial QSfera import

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

@@ -0,0 +1,57 @@
+// Copyright 2016 Qiang Xue. 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"
+)
+
+// ErrInInvalid is the error that returns in case of an invalid value for "in" rule.
+var ErrInInvalid = NewError("validation_in_invalid", "must be a valid value")
+
+// In returns a validation rule that checks if a value can be found in the given list of values.
+// reflect.DeepEqual() will be used to determine if two values are equal.
+// For more details please refer to https://golang.org/pkg/reflect/#DeepEqual
+// An empty value is considered valid. Use the Required rule to make sure a value is not empty.
+func In[T any](values ...T) InRule[T] {
+	return InRule[T]{
+		elements: values,
+		err:      ErrInInvalid,
+	}
+}
+
+// InRule is a validation rule that validates if a value can be found in the given list of values.
+type InRule[T any] struct {
+	elements []T
+	err      Error
+}
+
+// Validate checks if the given value is valid or not.
+func (r InRule[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 nil
+		}
+	}
+
+	return r.err
+}
+
+// Error sets the error message for the rule.
+func (r InRule[T]) Error(message string) InRule[T] {
+	r.err = r.err.SetMessage(message)
+	return r
+}
+
+// ErrorObject sets the error struct for the rule.
+func (r InRule[T]) ErrorObject(err Error) InRule[T] {
+	r.err = err
+	return r
+}