Golang Web表单绑定与校验技巧

type LoginForm struct {
    Username string `form:"username" binding:"required"`
    Password string `form:"password" binding:"required,min=6"`
}

func login(c *gin.Context) {
    var form LoginForm
    if err := c.ShouldBind(&form); err != nil {
        c.JSON(400, gin.H{"error": err.Error()})
        return
    }
    // 处理登录逻辑
}

type RegisterForm struct {
    Email    string `form:"email" binding:"required,email"`
    Age      int    `form:"age" binding:"required,gt=0,lt=120"`
    Password string `form:"password" binding:"required,min=8"`
}

import "github.com/go-playground/validator/v10"

var validate *validator.Validate

func init() {
    validate = validator.New()
    validate.RegisterValidation("password_eq", validatePasswordEqual)
}

func validatePasswordEqual(fl validator.FieldLevel) bool {
    password := fl.Field().String()
    other := fl.Parent().FieldByName("Password").String()
    return password == other
}

type ChangePasswordForm struct {
    Password    string `form:"password" binding:"required,min=8"`
    ConfirmPass string `form:"confirm_pass" binding:"required,password_eq"`
}

if err != nil {
    if errs, ok := err.(validator.ValidationErrors); ok {
        msg := make(map[string]string)
        for _, e := range errs {
            msg[e.Field()] = translateError(e)
        }
        c.JSON(400, gin.H{"errors": msg})
        return
    }
}