gin参数校验

github.com/go-playground/validator/v10

required    //必填；
len=11      //长度=11；
min=3       //如果是数字，验证的是数据大小范围，最小值为3，如果是文本，验证的是最小长度为3，
max=6       //如果是数字，验证的是数字最大值为6，如果是文本，验证的是最大长度为6
mail        //验证邮箱
gt=3        //对于文本就是长度>=3
lt=6        //对于文本就是长度<=6

package middleware

import (
	"github.com/gin-gonic/gin"
	"github.com/gin-gonic/gin/binding"
	"github.com/go-playground/locales/en"
	"github.com/go-playground/locales/zh"
	ut "github.com/go-playground/universal-translator"
	validator "github.com/go-playground/validator/v10"
	enTranslations "github.com/go-playground/validator/v10/translations/en"
	zhTranslations "github.com/go-playground/validator/v10/translations/zh"
)

func Translations() gin.HandlerFunc {
	return func(c *gin.Context) {
		//locale := .GetHeader("Acept-Language")
		locale := "zh"
		uni := ut.New(en.New(), zh.New())
		trans, _ := uni.GetTranslator(locale)
		v, ok := binding.Validator.Engine().(*validator.Validate)
		if ok {
			switch locale {
			case "zh":
				_ = zhTranslations.RegisterDefaultTranslations(v, trans)
			case "en":
				_ = enTranslations.RegisterDefaultTranslations(v, trans)
			default:
				_ = zhTranslations.RegisterDefaultTranslations(v, trans)
			}
			c.Set("trans", trans)
		}
		c.Next()
	}
}

/* type Register struct {
	UserName string `form:"user_name" json:"user_name"  binding:"required,min=1"`
	Pass string `form:"pass" json:"pass" binding:"required,min=6,max=20"`
	Captcha string `form:"captcha" json:"captcha" binding:"required,len=4"`
	Age float64 `form:"age" json:"age" binding:"required,min=1,max=200"`
    //  注意： 如果你的表单参数含有0值是允许提交的，必须用指针类型（*float64），而 float64 类型则认为 0 值不合格
	Status *float64 `form:"status" json:"status"  binding:"required,min=0,max=1"`
} */

package utils

import (
	"fmt"

	"github.com/gin-gonic/gin"
	ut "github.com/go-playground/universal-translator"
	"github.com/go-playground/validator/v10"
)
// ShouldBindJSON 封装绑定及错误翻译
func ShouldBindJSON(c *gin.Context, obj interface{}) error {
	if err := c.ShouldBindJSON(obj); err != nil {
		//翻译错误信息
		if errs, ok := err.(validator.ValidationErrors); ok {
			v := c.Value("trans")
			trans, _ := v.(ut.Translator)
			var e string
			for _, v := range errs.Translate(trans) {
				e += fmt.Sprintf("%s ", v)
			}
			return fmt.Errorf(e)
		}
	}
	return nil
}