Wohoo! Working elytras ! only need theadmins tools !

LICENSE

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+This software is running under the Creative Commons LICENSE Attribution-NonCommercial-ShareAlike 4.0 International
+which can be found at https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode

plugin.yml

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+---
+name: Elytra
+author:  Ad5001
+version: 2.0
+api: [3.0.0]
+main: Ad5001\Elytra\Main
+commands: 
+    opelytra:
+        description: "Get an OP elytra"
+        usage: "/opelytra"
+        permission: elytra.getopelytra
+    boost:
+        description: "Boost yourself in elytra !"
+        usage: "/boost [strength = 2]"
+        permission: elytra.boost
+        aliases: [b]
+permissions: 
+    elytra.getopelytra:
+        default: op
+    elytra.boost:
+        default: true
+...

src/Ad5001/Elytra/Elytra.php

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+<?php
+
+
+namespace Ad5001\Elytra;
+
+
+
+use pocketmine\Server;
+
+
+use pocketmine\Player;
+
+
+use pocketmine\item\Armor;
+
+
+use Ad5001\Elytra\Main;
+
+
+
+
+
+
+
+class Elytra extends Armor {
+
+
+	public function __construct($meta = 0, $count = 1){
+		parent::__construct(444, $meta, $count, "Elytra");
+	}
+
+
+
+
+}

src/Ad5001/Elytra/Main.php

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+<?php
+
+
+namespace Ad5001\Elytra;
+
+
+use pocketmine\command\CommandSender;
+
+
+use pocketmine\command\Command;
+
+
+use pocketmine\event\Listener;
+
+
+use pocketmine\plugin\PluginBase;
+
+
+use pocketmine\Server;
+
+
+use pocketmine\Player;
+
+
+use pocketmine\item\Item;
+
+
+use pocketmine\nbt\tag\CompoundTag;
+use pocketmine\nbt\tag\StringTag;
+
+
+use pocketmine\item\enchantment\Enchantment;
+
+
+use Ad5001\Elytra\tasks\AdminGotoTask;
+
+
+
+
+
+
+class Main extends PluginBase implements Listener {
+
+    /*
+    Called when the plugin enables
+    */
+    public function onEnable() {
+        $this->getServer()->getPluginManager()->registerEvents($this,$this);
+        $this->getServer()->getScheduler()->scheduleRepeatingTask(new AdminGotoTask($this), 20);
+		Item::$list[444] = Elytra::class;
+        Item::addCreativeItem(new Elytra());
+    }
+
+
+    /*
+    Prevent when someone is falling
+    @param     $event    \pocketmine\event\entity\EntityDamageEvent
+    @return null
+    */
+    public function onEntityDamage(\pocketmine\event\entity\EntityDamageEvent $event) {
+        if($event->getCause() == 4 && $event->getEntity()->getInventory()->getChestplate()->getId() == 444) {
+            $event->setCancelled();
+        }
+    }
+
+
+    /*
+    Prevents the player from being kicked of flyign by using the elytras.
+    @param     $event    \pocketmine\event\player\PlayerKickEvent
+    */
+    public function onPlayerKick(\pocketmine\event\player\PlayerKickEvent $event) {
+        if(strpos($event->getReason(), "Flying is not enabled on this server") !== false && $event->getPlayer()->getInventory()->getChestplate()->getId() == 444) {
+            $event->setCancelled();
+        }
+    }
+
+
+    /*
+    Called when one of the defined commands of the plugin has been called
+    @param     $sender     \pocketmine\command\CommandSender
+    @param     $cmd          \pocketmine\command\Command
+    @param     $label         mixed
+    @param     $args          array
+    return bool
+    */
+    public function onCommand(\pocketmine\command\CommandSender $sender, \pocketmine\command\Command $cmd,$label, array $args): bool {
+         switch($cmd->getName()) {
+            case "opelytra":
+            if($sender instanceof Player) {
+                $item = new Elytra();
+                $nbt = new CompoundTag("", [
+                    "isAdminPowered" => new StringTag("isAdminPowered", 1)
+                ]);
+                $item->setCompoundTag($nbt);
+                $item->addEnchantment(Enchantment::getEnchantement(0)->setLevel(0));
+                $sender->getInventory()->addItem($item);
+                $sender->sendMessage("§aYou got your brand new elytra !");
+            }
+            break;
+            case "boost":
+            if($sender instanceof Player && $sender->getInventory()->getChestplate()->getId() == 444) {
+                $itr = new BlockIterator($sender->getLevel(), $sender->getPosition(), $sender->getDirectionVector(), $sender->getEyeHeight(), 7);
+                $itr->next();
+                $itr->next();
+                $itr->next();
+                $itr->next();
+                $itr->next();
+                $itr->next();
+                $sender->setMotion($itr->current());
+            }
+            break;
+         }
+         return false;
+    }
+
+}

src/Ad5001/Elytra/tasks/AdminGotoTask.php

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+<?php
+
+
+namespace Ad5001\Elytra\tasks;
+
+
+
+use pocketmine\Server;
+
+
+use pocketmine\scheduler\PluginTask;
+
+
+use pocketmine\utils\BlockIterator;
+
+
+use pocketmine\Player;
+
+
+
+use Ad5001\Elytra\Main;
+
+
+
+
+
+
+
+class AdminGotoTask extends PluginTask {
+
+
+
+
+   public function __construct(Main $main) {
+
+
+        parent::__construct($main);
+
+
+        $this->main = $main;
+
+
+        $this->server = $main->getServer();
+
+
+    }
+
+
+
+
+   public function onRun($tick) {
+       foreach ($this->server->getOnlinePlayers() as $player) {
+           if($player->getInventory()->getChestplate()->getId() == 444) {
+               if($player->getInventory()->getChestplate()->getNamedTagEntry("isAdminPowered") !== null) {
+                   $itr = new BlockIterator($player->getLevel(), $player->getPosition(), $player->getDirectionVector(), $player->getEyeHeight(), 7);
+                   $itr->next();
+                   $itr->next();
+                   $itr->next();
+                   $itr->next();
+                   $itr->next();
+                   $itr->next();
+                   $player->setMotion($itr->current);
+               }
+                // $player->setMotion(new \pocketmine\math\Vector3($player->getMotion()->x, 0, $player->getMotion()->z));
+           }
+
+
+           //Part needed for player's good working
+           $ref = new \ReflectionClass("pocketmine\\Player");
+           $prop = $ref->getProperty("gravity");
+           $prop->setAccessible(true);
+           $prop->setValue($player, 0);
+           $prop->setAccessible(false);
+           if($player->getMotion()->y !== 0) {
+            //    echo "{$player->getName()}:" . $player->getMotion()->y . "\n";
+           }
+       }
+    }
+
+
+
+
+}