jwt.go

	if token, err := request.ParseFromRequest(r, request.OAuth2Extractor, keyLookupFunc2); err == nil {

		claims := token.Claims.(jwt.MapClaims)
		fmt.Printf("Token for user %v expires %v", claims["user"], claims["exp"])

	} else if err != nil {

		fmt.Println("Error: ", err)

		switch err.(type) {

		case *jwt.ValidationError:

			vErr := err.(*jwt.ValidationError)

			switch vErr.Errors {

			case jwt.ValidationErrorExpired:
				fmt.Fprintln(w, "Your token has expired!")
				return
			case jwt.ValidationErrorSignatureInvalid:
				fmt.Fprintln(w, "Token signature does not match!")
				return
			default:
				fmt.Fprintln(w, "Your token is invalid!")
				return
			}
		default:
			fmt.Fprintln(w, "Your token is invalid!")
			return
		}
	}