package main

import (
	"encoding/json"
	"fmt"

	peering "forge.cadoles.com/Cadoles/go-http-peering"
	"github.com/dgrijalva/jwt-go"
	"github.com/pkg/errors"
)

func verifyToken() {
	rawToken, err := loadToken()
	if err != nil {
		handleError(errors.WithStack(err))
	}

	privateKey, err := loadPrivateKey()
	if err != nil {
		handleError(errors.WithStack(err))
	}

	fn := func(token *jwt.Token) (interface{}, error) {
		return &privateKey.PublicKey, nil
	}

	token, err := jwt.ParseWithClaims(rawToken, &peering.ServerTokenClaims{}, fn)
	if err != nil {
		validationError, ok := err.(*jwt.ValidationError)
		if ok {
			handleError(errors.WithStack(validationError.Inner))
		}

		handleError(errors.WithStack(err))
	}

	if !token.Valid {
		handleError(errors.New("token is invalid"))
	}

	claims, ok := token.Claims.(*peering.ServerTokenClaims)
	if !ok {
		handleError(errors.New("unexpected token claims"))
	}

	data, err := json.MarshalIndent(claims, "", "  ")
	if err != nil {
		handleError(errors.WithStack(err))
	}

	fmt.Println("Token OK.")
	fmt.Println("Claims:")
	fmt.Println(string(data))

}