自定义验证器

注册自定义验证器，查看示例代码.

  1. package main
  2. import (
  3.     "net/http"
  4.     "reflect"
  5.     "time"
  6.     "github.com/gin-gonic/gin"
  7.     "github.com/gin-gonic/gin/binding"
  8.     "gopkg.in/go-playground/validator.v8"
  9. )
  10. // Booking 包含绑定和验证的数据。
  11. type Booking struct {
  12.     CheckIn  time.Time `form:"check_in" binding:"required,bookabledate" time_format:"2006-01-02"`
  13.     CheckOut time.Time `form:"check_out" binding:"required,gtfield=CheckIn" time_format:"2006-01-02"`
  14. }
  15. func bookableDate(
  16.     v *validator.Validate, topStruct reflect.Value, currentStructOrField reflect.Value,
  17.     field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string,
  18. ) bool {
  19.     if date, ok := field.Interface().(time.Time); ok {
  20.         today := time.Now()
  21.         if today.Year() > date.Year() || today.YearDay() > date.YearDay() {
  22.             return false
  23.         }
  24.     }
  25.     return true
  26. }
  27. func main() {
  28.     route := gin.Default()
  29.     if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
  30.         v.RegisterValidation("bookabledate", bookableDate)
  31.     }
  32.     route.GET("/bookable", getBookable)
  33.     route.Run(":8085")
  34. }
  35. func getBookable(c *gin.Context) {
  36.     var b Booking
  37.     if err := c.ShouldBindWith(&b, binding.Query); err == nil {
  38.         c.JSON(http.StatusOK, gin.H{"message": "Booking dates are valid!"})
  39.     } else {
  40.         c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
  41.     }
  42. }
  1. $ curl "localhost:8085/bookable?check_in=2018-04-16&check_out=2018-04-17"
  2. {"message":"Booking dates are valid!"}
  3. $ curl "localhost:8085/bookable?check_in=2018-03-08&check_out=2018-03-09"
  4. {"error":"Key: 'Booking.CheckIn' Error:Field validation for 'CheckIn' failed on the 'bookabledate' tag"}

结构体级别的验证器 也可以通过其他的方式注册。更多信息请参阅 struct-lvl-validation 示例。