learning_cloud_native_go.12.util.validator.go

import "regexp"

const (
	alphaSpaceRegexString string = "^[a-zA-Z ]+$"
	dateRegexString       string = "^(((19|20)([2468][048]|[13579][26]|0[48])|2000)[/-]02[/-]29|((19|20)[0-9]{2}[/-](0[469]|11)[/-](0[1-9]|[12][0-9]|30)|(19|20)[0-9]{2}[/-](0[13578]|1[02])[/-](0[1-9]|[12][0-9]|3[01])|(19|20)[0-9]{2}[/-]02[/-](0[1-9]|1[0-9]|2[0-8])))$"
)

func New() *validator.Validate {
  // ...
  
  validate.RegisterValidation("alpha_space", isAlphaSpace)
  validate.RegisterValidation("date", isDate)

  return validate
}

func isAlphaSpace(fl validator.FieldLevel) bool {
	reg := regexp.MustCompile(alphaSpaceRegexString)
	return reg.MatchString(fl.Field().String())
}

func isDate(fl validator.FieldLevel) bool {
	reg := regexp.MustCompile(dateRegexString)
	return reg.MatchString(fl.Field().String())
}

func ToErrResponse(err error) *ErrResponse {
  // ...

	for i, err := range fieldErrors {
		switch err.Tag() {
		// ...
		case "alpha_space":
			resp.Errors[i] = fmt.Sprintf("%s can only contain alphabetic and space characters", err.Field())
		case "date":
			resp.Errors[i] = fmt.Sprintf("%s must be a valid date", err.Field())
		// ...
		}
	}
    
  //... 
}