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Gin Web Framework

Validator kustom

Gin menggunakan go-playground/validator untuk validasi tingkat field. Selain validator bawaan (seperti required, email, min, max), Anda dapat mendaftarkan fungsi validasi kustom Anda sendiri.

Contoh di bawah ini mendaftarkan validator bookabledate yang menolak tanggal di masa lalu, memastikan bahwa tanggal check-in dan check-out pemesanan selalu di masa depan.

package main


import (
  "net/http"
  "time"


  "github.com/gin-gonic/gin"
  "github.com/gin-gonic/gin/binding"
  "github.com/go-playground/validator/v10"
)


// Booking contains binded and validated data.
type Booking struct {
  CheckIn  time.Time `form:"check_in" binding:"required,bookabledate" time_format:"2006-01-02"`
  CheckOut time.Time `form:"check_out" binding:"required,gtfield=CheckIn,bookabledate" time_format:"2006-01-02"`
}


var bookableDate validator.Func = func(fl validator.FieldLevel) bool {
  date, ok := fl.Field().Interface().(time.Time)
  if ok {
    today := time.Now()
    if today.After(date) {
      return false
    }
  }
  return true
}


func main() {
  route := gin.Default()


  if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
    v.RegisterValidation("bookabledate", bookableDate)
  }


  route.GET("/bookable", getBookable)
  route.Run(":8085")
}


func getBookable(c *gin.Context) {
  var b Booking
  if err := c.ShouldBindWith(&b, binding.Query); err == nil {
    c.JSON(http.StatusOK, gin.H{"message": "Booking dates are valid!"})
  } else {
    c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
  }
}

Uji coba

Terminal window
# Both dates are in the future and check_out > check_in
curl "http://localhost:8085/bookable?check_in=2118-04-16&check_out=2118-04-17"
# Output: {"message":"Booking dates are valid!"}


# check_out is before check_in -- fails gtfield validation
curl "http://localhost:8085/bookable?check_in=2118-03-10&check_out=2118-03-09"
# Output: {"error":"Key: 'Booking.CheckOut' Error:Field validation for 'CheckOut' failed on the 'gtfield' tag"}

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