65 lines
1.9 KiB
Go
65 lines
1.9 KiB
Go
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package main
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import (
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"net/http"
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"reflect"
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"github.com/gin-gonic/gin"
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"github.com/gin-gonic/gin/binding"
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validator "gopkg.in/go-playground/validator.v8"
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)
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// User contains user information.
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type User struct {
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FirstName string `json:"fname"`
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LastName string `json:"lname"`
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Email string `binding:"required,email"`
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}
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// UserStructLevelValidation contains custom struct level validations that don't always
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// make sense at the field validation level. For example, this function validates that either
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// FirstName or LastName exist; could have done that with a custom field validation but then
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// would have had to add it to both fields duplicating the logic + overhead, this way it's
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// only validated once.
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//
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// NOTE: you may ask why wouldn't not just do this outside of validator. Doing this way
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// hooks right into validator and you can combine with validation tags and still have a
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// common error output format.
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func UserStructLevelValidation(v *validator.Validate, structLevel *validator.StructLevel) {
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user := structLevel.CurrentStruct.Interface().(User)
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if len(user.FirstName) == 0 && len(user.LastName) == 0 {
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structLevel.ReportError(
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reflect.ValueOf(user.FirstName), "FirstName", "fname", "fnameorlname",
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)
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structLevel.ReportError(
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reflect.ValueOf(user.LastName), "LastName", "lname", "fnameorlname",
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)
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}
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// plus can to more, even with different tag than "fnameorlname"
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}
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func main() {
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route := gin.Default()
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if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
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v.RegisterStructValidation(UserStructLevelValidation, User{})
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}
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route.POST("/user", validateUser)
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route.Run(":8085")
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}
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func validateUser(c *gin.Context) {
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var u User
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if err := c.ShouldBindJSON(&u); err == nil {
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c.JSON(http.StatusOK, gin.H{"message": "User validation successful."})
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} else {
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c.JSON(http.StatusBadRequest, gin.H{
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"message": "User validation failed!",
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"error": err.Error(),
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})
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}
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}
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