Noclip.java

package com.sijobe.spc.command;

import com.sijobe.spc.overwrite.ONetServerHandler;
import com.sijobe.spc.util.FontColour;
import com.sijobe.spc.validation.Parameters;
import com.sijobe.spc.wrapper.CommandBase;
import com.sijobe.spc.wrapper.CommandException;
import com.sijobe.spc.wrapper.CommandSender;
import com.sijobe.spc.wrapper.Coordinate;
import com.sijobe.spc.wrapper.Minecraft;
import com.sijobe.spc.wrapper.Player;

import java.util.List;

import net.minecraft.server.MinecraftServer;
import net.minecraft.src.EntityPlayerMP;
import net.minecraft.src.NetServerHandler;

/**
 * Command for disabling clipping
 *
 * @author q3hardcore
 * @version 1.2
 */
@Command (
         name = "noclip",
         description = "Enables and disables the ability to clip for the player",
         example = "",
         videoURL = "http://www.youtube.com/watch?v=4ZOvu3hf7k0", // video for fly command
         enabled = true
)
public class Noclip extends StandardCommand {

   @Override
   public void execute(CommandSender sender, List<?> params) throws CommandException {
      Player player = CommandBase.getSenderAsPlayer(sender);

      System.out.println(player.getUsername() + " " + MinecraftServer.getServer().getServerOwner());
      /*if(!player.getUsername().equals(MinecraftServer.getServer().getServerOwner())) {
         throw new CommandException("Must be server host");
      }*/
      if(!player.getMinecraftPlayer().capabilities.isFlying && !player.getMinecraftPlayer().noClip) {
         throw new CommandException("Must be flying");
      }

      if (params.size() == 0) {
         player.getMinecraftPlayer().noClip ^= true;
      } else {
         player.getMinecraftPlayer().noClip = (Boolean)params.get(0);
      }

      // replace server handler
      if(player.getMinecraftPlayer() instanceof EntityPlayerMP) {
         updateServerHandler((EntityPlayerMP)player.getMinecraftPlayer());
      } else {
         player.getMinecraftPlayer().noClip = false;
         throw new CommandException("Noclip unavailable");
      }

      if(player.getMinecraftPlayer().noClip == false) {
         ascendPlayer(player);
      }
      Minecraft.getMinecraft().thePlayer.noClip = player.getMinecraftPlayer().noClip;
      player.sendChatMessage("Noclip is now " + FontColour.AQUA + (!player.getMinecraftPlayer().noClip ? "disabled" : "enabled"));
   }

   @Override
   public Parameters getParameters() {
      return Parameters.DEFAULT_BOOLEAN;
   }

   private static boolean hasXCommands() {
      try {
         NetServerHandler.class.getDeclaredField("clientHasXCommands");
         return true;
      } catch (Throwable t) {
         return false;
      }
   }

   /**
    * Changes server handler to SPC's server handler if noclip is enabled,
    * otherwise restores the default server handler.
    */
   private static void updateServerHandler(EntityPlayerMP playerEntity) {
      if(hasXCommands()) {
         return;
      }

      NetServerHandler handler = playerEntity.playerNetServerHandler;

      if(playerEntity.noClip) {
         if(!(handler instanceof ONetServerHandler)) {
            playerEntity.playerNetServerHandler = new ONetServerHandler(MinecraftServer.getServer(),
                     handler.netManager, handler.playerEntity, handler);
         }
      } else {
         if(handler instanceof ONetServerHandler) {
            NetServerHandler oldInstance = ((ONetServerHandler)handler).getOldInstance();
            if(oldInstance != null) {
               handler.netManager.setNetHandler(oldInstance);
               playerEntity.playerNetServerHandler = oldInstance;
            }
         }
      }
   }

   public static void checkSafe(EntityPlayerMP player) {
      if(player.noClip && !player.capabilities.isFlying) {
         player.noClip = false;
         Minecraft.getMinecraft().thePlayer.noClip = false;
         player.addChatMessage("Noclip auto-disabled. (Player not flying)");
         updateServerHandler(player);
         ascendPlayer(new Player(player));
      }
   }

   private static boolean ascendPlayer(Player player) {
      Coordinate playerPos = player.getPosition();
      if(player.isClearBelow(playerPos) && playerPos.getY() > 0) {
         return false;
      }
      double y = playerPos.getY() - 1; // in case player was standing on ground
      while (y < 260) {
         if(player.isClear(new Coordinate(playerPos.getX(), y++, playerPos.getZ()))) {
            final double newY;
            if(playerPos.getY() > 0) {
               newY = y - 1;
            } else {
               newY = y;
            }
            Coordinate newPos = new Coordinate(playerPos.getX() + 0.5F, newY, playerPos.getZ() + 0.5F);
            player.setPosition(newPos);
            break;
         }
      }
      return true;
   }
}