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package it |
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import ( |
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"context" |
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"time" |
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"github.com/muonsoft/validation" |
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) |
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// DateTimeConstraint checks that the string value is a valid date and time value specified by a specific layout. |
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// The layout can be redefined using the [DateTimeConstraint.WithLayout] method. |
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type DateTimeConstraint struct { |
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isIgnored bool |
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groups []string |
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err error |
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layout string |
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messageTemplate string |
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messageParameters validation.TemplateParameterList |
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} |
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// IsDateTime checks that the string value is a valid date and time. By default, it uses [time.RFC3339] layout. |
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// The layout can be redefined using the [DateTimeConstraint.WithLayout] method. |
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func IsDateTime() DateTimeConstraint { |
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return DateTimeConstraint{ |
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layout: time.RFC3339, |
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err: validation.ErrInvalidDateTime, |
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messageTemplate: validation.ErrInvalidDateTime.Message(), |
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} |
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} |
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// IsDate checks that the string value is a valid date. It uses "2006-01-02" layout. |
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// The layout can be redefined using the [DateTimeConstraint.WithLayout] method. |
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func IsDate() DateTimeConstraint { |
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return DateTimeConstraint{ |
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layout: "2006-01-02", |
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err: validation.ErrInvalidDate, |
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messageTemplate: validation.ErrInvalidDate.Message(), |
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} |
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} |
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// IsTime checks that the string value is a valid time. It uses "15:04:05" layout. |
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// The layout can be redefined using the WithLayout method. |
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func IsTime() DateTimeConstraint { |
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return DateTimeConstraint{ |
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layout: "15:04:05", |
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err: validation.ErrInvalidTime, |
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messageTemplate: validation.ErrInvalidTime.Message(), |
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} |
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} |
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// WithLayout specifies the layout to be used for datetime parsing. |
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func (c DateTimeConstraint) WithLayout(layout string) DateTimeConstraint { |
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c.layout = layout |
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return c |
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} |
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// WithError overrides default error for produced violation. |
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func (c DateTimeConstraint) WithError(err error) DateTimeConstraint { |
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c.err = err |
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return c |
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} |
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// WithMessage sets the violation message template. You can set custom template parameters |
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// for injecting its values into the final message. Also, you can use default parameters: |
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// |
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// {{ layout }} - date time layout used for parsing; |
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// {{ value }} - the current (invalid) value. |
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func (c DateTimeConstraint) WithMessage(template string, parameters ...validation.TemplateParameter) DateTimeConstraint { |
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c.messageTemplate = template |
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c.messageParameters = parameters |
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return c |
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} |
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// When enables conditional validation of this constraint. If the expression evaluates to false, |
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// then the constraint will be ignored. |
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func (c DateTimeConstraint) When(condition bool) DateTimeConstraint { |
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c.isIgnored = !condition |
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return c |
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} |
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// WhenGroups enables conditional validation of the constraint by using the validation groups. |
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func (c DateTimeConstraint) WhenGroups(groups ...string) DateTimeConstraint { |
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c.groups = groups |
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return c |
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} |
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func (c DateTimeConstraint) ValidateString(ctx context.Context, validator *validation.Validator, value *string) error { |
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if c.isIgnored || validator.IsIgnoredForGroups(c.groups...) || value == nil || *value == "" { |
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return nil |
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} |
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if _, err := time.Parse(c.layout, *value); err == nil { |
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return nil |
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} |
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return validator.BuildViolation(ctx, c.err, c.messageTemplate). |
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WithParameters( |
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c.messageParameters.Prepend( |
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validation.TemplateParameter{Key: "{{ layout }}", Value: c.layout}, |
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validation.TemplateParameter{Key: "{{ value }}", Value: *value}, |
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)..., |
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). |
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WithParameter("{{ value }}", *value).Create() |
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} |
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muonsoft /
validation
