plugin.yml

name: BlockedIP
author: PEMapModder
version: 1.0.0
api: [1.0.0]
main: BlcokedIP\BlockedIP

src--BlockedIP--BlockedIP.php

<?php

namespace BlockedIP;

use pocketmine\Player;
use pocketmine\event\Listener;
use pocketmine\event\player\PlayerPreLoginEVent;
use pocketmine\plugin\PluginBase;

class BlockedIP extends PluginBase implements Listener{
  private $blockedIPs = [];
  private $whiteIPs = [];
  
  public function onLogin(PlayerPreLoginEvent $event){
    if($this->checkIp($event->getPlayer(), $reason) === self::IP_CHECK_BANNED){
      $event->setCancelled();
      $event->setKickMessage($reason->reason);
    }
  }
  
  // API START
  public function addBlockedIp($ip, $reason){
    $this->blockedIPs[$ip] = $reason;
    foreach($this->getServer()->getOnlinePlayers() as $player){
      if($player->getAddress() === $ip){
        $player->kick($reason->reason);
      }
    }
  }
  
  public function whitelistIp($ip){
    $this->whiteIPs[$ip] = true;
  }
  
  const IP_CHECK_BANNED = 1;
  const IP_CHECK_OK = 0;
  const IP_CHECK_LOADING = 2;
  public function checkIp(Player $player, &$reason = null){
    if(isset($this->blockedIPs[$ip = $player->getAddress()])){
      $reason = $this->blockedIPs[$ip]->reason;
      return self::IP_CHECK_BANNED;
    }
    if(isset($this->whiteIPs[$ip])){
      return self::IP_CHECK_OK;
    }
    $task = new CheckAddressTask;
    $task->key = $this->getConfig()->get("apiKey");
    $task->ip = $ip;
    $this->getServer()->getScheduler()->scheduleAsyncTask($task);
    return self::IP_CHECK_LOADING;
  }
  // API END
}

src--BlockedIP--CheckAddressTask.php

<?php

namespace BlockedIP;

use pocketmine\scheduler\AsyncTask;
use pocketmine\utils\Utils;

class CheckAddressTask extends AsyncTask{
  public $key;
  public $ip;
  private $success = false;
  public function onRun(){
    $result = Utils::getURL("http://www.example.com/blockscript/detector.php?blockscript=api&api_key=$this->key&action=test_ipv4&ip=$this->ip");
    $xml = simplexml_load_string($result);
    if(is_object($xml)){
      $status = $xml->status;
      if($status === "SUCCESS"){
        $this->success = true;
        $ip = $xml->ip;
        if($ip->blocked === "YES"){
          $this->setResult($ip);
        }
      }
    }
  }
  public function onCompletion(Server $server){
    $main = $server->getPluginManager()->getPlugin("BlockedIP");
    if($main instanceof BlockedIP){
      $result = $this->getResult();
      if(is_object($result)){
        $main->addBlockedIp($this->ip, $result);
      }else{
        $main->whitelistIp($this->ip);
      }
    }
  }
}