package main

import (
	"fmt"
	"time"

	"github.com/dgrijalva/jwt-go"
	"gopkg.in/gin-gonic/gin.v1"
)

func verifyLogin(c *gin.Context) bool {
	tokenString, err := c.Cookie("authentication")
	if err != nil {
		return false
	}

	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
		}
		return []byte(secret), nil
	})

	if !verifyToken(c, token, err) {
		c.SetCookie("authentication", "", -1, "", "", false, false)
		return false
	}

	return true
}

func verifyToken(c *gin.Context, token *jwt.Token, err error) bool {
	if err != nil {
		return false
	}

	claims, ok := token.Claims.(jwt.MapClaims)
	if !ok || !token.Valid {
		return false
	}

	if !claims.VerifyExpiresAt(time.Now().Unix(), true) {
		return false
	}

	return true
}