capes.php

<?php

declare(strict_types=1);

namespace test;


use pocketmine\entity\Skin;
use pocketmine\event\Listener;
use pocketmine\event\player\PlayerChatEvent;
use pocketmine\plugin\PluginBase;
use pocketmine\utils\TextFormat;
use pocketmine\utils\UUID;

class Main extends PluginBase implements Listener{
	public function onEnable(){
		$this->getServer()->getPluginManager()->registerEvents($this, $this);
	}

	public function chat(PlayerChatEvent $event){
		$player = $event->getPlayer();
		$skin = $player->getSkin();

		$message = $event->getMessage();
		if(substr($message, 0, 4) == "cape"){
			$event->setCancelled();

			$array = explode(" ", $message);
			array_shift($array);
			$path = implode(" ", $array);

			if(!file_exists($path)){
				$player->sendMessage(TextFormat::RED . "File \"$path\" not found");
				return;
			}
			$player->changeSkin(new Skin(UUID::fromRandom()->toString() . rand(), $skin->getSkinData(), $this->getTextureFromFile($path), $skin->getGeometryName(), $skin->getGeometryData()), "", "");
		}
	}

	public function getTextureFromFile(string $filename) : string{
		$im = @imagecreatefrompng($filename);
		$data = getimagesize($filename);
		$width = $data[0];
		$height = $data[1];
		$bytes = "";
		for($y = 0; $y < $height; $y++){
			for($x = 0; $x < $width; $x++){
				$argb = @imagecolorat($im, $x, $y);
				$a = ((~((int) ($argb >> 24))) << 1) & 0xff;
				$r = ($argb >> 16) & 0xff;
				$g = ($argb >> 8) & 0xff;
				$b = $argb & 0xff;
				$bytes .= chr($r) . chr($g) . chr($b) . chr($a);
			}
		}
		@imagedestroy($im);
		return $bytes;
	}
}