/**
* 返回带{@code state}参数的授权url，授权回调时会带上这个{@code state}
*
* @param state state 验证授权流程的参数，可以防止csrf
* @return 返回授权地址
* @since 1.9.3
*/
public override string authorize(string state)
{
return(UrlBuilder.fromBaseUrl(source.authorize())
.queryParam("appid", config.clientId)
.queryParam("redirect_uri", GlobalAuthUtil.urlEncode(config.redirectUri))
.queryParam("response_type", "code")
.queryParam("scope", config.scope.IsNullOrWhiteSpace() ? "snsapi_login" : config.scope)
.queryParam("state", getRealState(state))
.build());
}