95 lines
1.8 KiB
Go
95 lines
1.8 KiB
Go
package validation
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import (
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"reflect"
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"strings"
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"github.com/spf13/cast"
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)
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type Length struct {
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Min *int
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Max *int
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MinMessage string
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MaxMessage string
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ExactMessage string
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TypeErrorMessage string
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}
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func NewLength() Length {
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return Length{
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MinMessage: "This value is too short (min: {{ min }}).",
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MaxMessage: "This value is too long (max: {{ max }}).",
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ExactMessage: "This value is not valid (expected: {{ min }}).",
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TypeErrorMessage: "This value can not be processed.",
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}
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}
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func (c Length) WithMin(v int) Length {
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c.Min = &v
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return c
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}
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func (c Length) WithMax(v int) Length {
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c.Max = &v
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return c
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}
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func (c Length) WithExact(v int) Length {
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c.Min = &v
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c.Max = &v
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return c
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}
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func (c Length) Validate(data any) []Error {
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if c.Min == nil && c.Max == nil {
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return []Error{}
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}
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errors := []Error{}
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t := reflect.TypeOf(data)
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if t.Kind() == reflect.Ptr {
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t = t.Elem()
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}
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var size *int
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switch t.Kind() {
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case reflect.Array:
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case reflect.Slice:
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s := reflect.ValueOf(data).Len()
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size = &s
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case reflect.String:
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s := len(data.(string))
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size = &s
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default:
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errors = append(errors, Error(c.TypeErrorMessage))
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}
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if size != nil {
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if c.Max != nil && c.Min != nil {
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if *c.Max == *c.Min && *size != *c.Max {
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errors = append(errors, Error(c.BuildMessage(c.ExactMessage)))
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}
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} else if c.Min != nil && *size < *c.Min {
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errors = append(errors, Error(c.BuildMessage(c.MinMessage)))
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} else if c.Max != nil && *size > *c.Max {
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errors = append(errors, Error(c.BuildMessage(c.MaxMessage)))
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}
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}
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return errors
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}
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func (c *Length) BuildMessage(message string) string {
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message = strings.ReplaceAll(message, "{{ min }}", cast.ToString(c.Min))
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message = strings.ReplaceAll(message, "{{ max }}", cast.ToString(c.Max))
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return message
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}
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