validate-example.go

package main

import (
	"fmt"
	"net/http"

	"github.com/labstack/echo"
	"github.com/labstack/echo/middleware"
	"github.com/labstack/gommon/log"
	validator "gopkg.in/go-playground/validator.v9"
)

type (
	// Validator custom validator function to validate incoming json structs.
	Validator struct {
		validator *validator.Validate
	}
)

// Validate incoming json forms. See: http://gopkg.in/go-playground/validator.v9
func (cv *Validator) Validate(i interface{}) error {
	err := cv.validator.Struct(i)
	if err != nil {
		return echo.NewHTTPError(400, err.Error())
	}
	return nil
}

type RegisterForm struct {
	Email    string `json:"email" validate:"email"`
	Password string `json:"password" validate:"required"`
}

func main() {
	// Echo instance
	e := echo.New()
	e.Binder = &echo.ValidateBinder{}
	e.Validator = &Validator{validator: validator.New()}

	// Middleware
	e.Use(middleware.LoggerWithConfig(middleware.LoggerConfig{
		Format: "${method} ${uri} ${status} ${latency_human}\n",
	}))
	e.Use(middleware.Recover())

	if l, ok := e.Logger.(*log.Logger); ok {
		l.SetHeader("${time_rfc3339} ${level}")
	}

	// Routes
	e.POST("/", register)

	// Start server
	e.Logger.Fatal(e.Start(":1323"))
}

// Handler
func register(c echo.Context) error {
	var form RegisterForm
	if err := c.Bind(&form); err != nil {
		return err
	}

	return c.String(http.StatusOK, fmt.Sprintf("Registered %s!", form.Email))
}