static decodeJWT(token: string): any {
        const base64Url = token.split('.')[1];
        const base64 = base64Url.replace('-', '+').replace('_', '/');
        return JSON.parse(this.b64DecodeUnicode(base64));
    }

    static b64DecodeUnicode(str): string {
        // Going backwards: from bytestream, to percent-encoding, to original string.
        return decodeURIComponent(
            atob(str)
                .split('')
                .map(c => {
                    return (
                        '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2)
                    );
                })
                .join('')
        );
    }