• 自定义验证器

    自定义验证器

    注册自定义验证器，查看示例代码.

    1. package main
    3. import (
    4.     "net/http"
    5.     "reflect"
    6.     "time"
    8.     "github.com/gin-gonic/gin"
    9.     "github.com/gin-gonic/gin/binding"
    10.     "gopkg.in/go-playground/validator.v8"
    11. )
    13. // Booking 包含绑定和验证的数据。
    14. type Booking struct {
    15.     CheckIn  time.Time `form:"check_in" binding:"required,bookabledate" time_format:"2006-01-02"`
    16.     CheckOut time.Time `form:"check_out" binding:"required,gtfield=CheckIn" time_format:"2006-01-02"`
    17. }
    19. func bookableDate(
    20.     v *validator.Validate, topStruct reflect.Value, currentStructOrField reflect.Value,
    21.     field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string,
    22. ) bool {
    23.     if date, ok := field.Interface().(time.Time); ok {
    24.         today := time.Now()
    25.         if today.Year() > date.Year() || today.YearDay() > date.YearDay() {
    26.             return false
    27.         }
    28.     }
    29.     return true
    30. }
    32. func main() {
    33.     route := gin.Default()
    35.     if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
    36.         v.RegisterValidation("bookabledate", bookableDate)
    37.     }
    39.     route.GET("/bookable", getBookable)
    40.     route.Run(":8085")
    41. }
    43. func getBookable(c *gin.Context) {
    44.     var b Booking
    45.     if err := c.ShouldBindWith(&b, binding.Query); err == nil {
    46.         c.JSON(http.StatusOK, gin.H{"message": "Booking dates are valid!"})
    47.     } else {
    48.         c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
    49.     }
    50. }
    1. $ curl "localhost:8085/bookable?check_in=2018-04-16&check_out=2018-04-17"
    2. {"message":"Booking dates are valid!"}
    4. $ curl "localhost:8085/bookable?check_in=2018-03-08&check_out=2018-03-09"
    5. {"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。