forked from ebhomengo/niki
85 lines
2.3 KiB
Go
85 lines
2.3 KiB
Go
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// Copyright 2016 Qiang Xue. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package validation
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import (
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"errors"
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"time"
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)
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type DateRule struct {
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layout string
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min, max time.Time
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message string
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rangeMessage string
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}
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// Date returns a validation rule that checks if a string value is in a format that can be parsed into a date.
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// The format of the date should be specified as the layout parameter which accepts the same value as that for time.Parse.
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// For example,
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// validation.Date(time.ANSIC)
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// validation.Date("02 Jan 06 15:04 MST")
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// validation.Date("2006-01-02")
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//
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// By calling Min() and/or Max(), you can let the Date rule to check if a parsed date value is within
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// the specified date range.
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//
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// An empty value is considered valid. Use the Required rule to make sure a value is not empty.
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func Date(layout string) *DateRule {
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return &DateRule{
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layout: layout,
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message: "must be a valid date",
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rangeMessage: "the data is out of range",
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}
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}
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// Error sets the error message that is used when the value being validated is not a valid date.
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func (r *DateRule) Error(message string) *DateRule {
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r.message = message
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return r
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}
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// RangeError sets the error message that is used when the value being validated is out of the specified Min/Max date range.
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func (r *DateRule) RangeError(message string) *DateRule {
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r.rangeMessage = message
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return r
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}
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// Min sets the minimum date range. A zero value means skipping the minimum range validation.
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func (r *DateRule) Min(min time.Time) *DateRule {
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r.min = min
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return r
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}
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// Max sets the maximum date range. A zero value means skipping the maximum range validation.
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func (r *DateRule) Max(max time.Time) *DateRule {
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r.max = max
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return r
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}
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// Validate checks if the given value is a valid date.
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func (r *DateRule) Validate(value interface{}) error {
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value, isNil := Indirect(value)
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if isNil || IsEmpty(value) {
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return nil
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}
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str, err := EnsureString(value)
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if err != nil {
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return err
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}
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date, err := time.Parse(r.layout, str)
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if err != nil {
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return errors.New(r.message)
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}
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if !r.min.IsZero() && r.min.After(date) || !r.max.IsZero() && date.After(r.max) {
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return errors.New(r.rangeMessage)
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}
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return nil
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}
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