class GetIsChannelSubscriberAction extends ChannelAction {

    @Override
    public boolean action(Request request, Response response) {<FILL_FUNCTION_BODY>}
}

        if (request.getNettyRequest() instanceof FullHttpRequest) {
            InputUserId input = getRequestBody(request.getNettyRequest(), InputUserId.class);
            boolean isSubscriber = messagesStore.checkUserInChannel(input.getUserId(), channelInfo.getTargetId());
            setResponseContent(RestResult.ok(isSubscriber), response);
        }
        return true;
    
<methods>public non-sealed void <init>() ,public cn.wildfirechat.common.ErrorCode preAction(com.xiaoleilu.loServer.handler.Request, com.xiaoleilu.loServer.handler.Response) <variables>private static final org.slf4j.Logger LOG,protected cn.wildfirechat.proto.WFCMessage.ChannelInfo channelInfo