src/main/java/darkknight/jewelrycraft/util/PlayerUtils.java


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package darkknight.jewelrycraft.util;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.server.MinecraftServer;
import net.minecraft.server.integrated.IntegratedServer;
import cpw.mods.fml.common.FMLCommonHandler;

/**
 * Code taken from OpenBlocks
 */
public class PlayerUtils 
{
    public static boolean isPlayerOp(String username) 
    {
        username = username.toLowerCase();

        MinecraftServer server = FMLCommonHandler.instance().getSidedDelegate().getServer();

        // SP and LAN
        if (server.isSinglePlayer()) {
            if (server instanceof IntegratedServer) return server.getServerOwner().equals(username);
            return server.getConfigurationManager().getOps().contains(username);
        }

        // SMP
        return server.getConfigurationManager().getOps().contains(username);
    }

    public static NBTTagCompound getModPlayerPersistTag(EntityPlayer player, String modName) 
    {

        NBTTagCompound tag = player.getEntityData();

        NBTTagCompound persistTag = null;
        if (tag.hasKey(EntityPlayer.PERSISTED_NBT_TAG)) 
        {
            persistTag = tag.getCompoundTag(EntityPlayer.PERSISTED_NBT_TAG);
        } else 
        {
            persistTag = new NBTTagCompound();
            tag.setTag(EntityPlayer.PERSISTED_NBT_TAG, persistTag);
        }

        NBTTagCompound modTag = null;
        if (persistTag.hasKey(modName)) 
        {
            modTag = persistTag.getCompoundTag(modName);
        } else 
        {
            modTag = new NBTTagCompound();
            persistTag.setTag(modName, modTag);
        }

        return modTag;
    }
}