Server-side mod for command aliases in game world without cheats

[NotSoLegacy]

Introduction:
I'm developing a modpack for version 1.12.2, it contains a lot of mods, interaction with some mods is only possible through commands. If players are prohibited from using cheats, they still have access to some harmless commands, such as /seed and the schematic mod commands. But there are also some informative commands - they simply display information in the chat for the player who type it, they do not give an unfair advantage, unlike /give, /gamemode, /teleport commands, but nevertheless they are prohibited when playing without cheats. One such command is /srpevolution getphase from the SRParasites mod.

The FTB utilities mod should solve my problem, but it doesn't work (https://github.com/FTBTeam/FTB-Mods-Issues/issues/1124). So I thought about writing my own mod. However, before this I had never developed mods for Minecraft.

The essence of the problem:
I want to write a mod that, based on data from the config, will add commands to the game that are available to players when playing without cheats. All these commands will do is call commands from other mods (for example /srpevolution getphase - that is, include commands consisting of several words), which are not available to players by default.
I tried to find the documentation https://docs.minecraftforge.net/en/1.12.x/search.html?q=command, but did not find a page describing adding commands to the mod, I found only a page about permissions and unrelated pages.
I tried to find information on this forum, but found information that is not relevant for 1.12.2 (either too old or too new). After copying the complete code, I received many red errors such as
 

public class CommandGive extends CommandBase

Cannot resolve symbol 'CommandBase'".

 

[Zhora]

The error "Unable to resolve symbol 'CommandBase'" usually occurs due to incorrect imports or missing dependencies. Make sure you have imported CommandBase and other required classes. Check your build.gradle or pom.xml file for all required dependencies.

[NotSoLegacy]

Oh, the problem really was in the import. But now other problems have appeared: (i can't post it, my message mark as spam)

I'm guessing most of the problems stem from the fact that this code is provided in the absence of other code that it references.

Here is the /give command code taken out of context:

package com.purplerupter.survivalreward.command;

import java.util.List;

import net.minecraft.command.CommandBase;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.server.MinecraftServer;

public class CommandGive extends CommandBase
{
    public String getCommandName()
    {
        return "give";
    }


    /**
     * Return the required permission level for this command.
     */
    public int getRequiredPermissionLevel()
    {
        return 2;
    }

    public String getCommandUsage(ICommandSender par1ICommandSender)
    {
        return par1ICommandSender.translateString("commands.give.usage", new Object[0]);
    }

    public void processCommand(ICommandSender par1ICommandSender, String[] par2ArrayOfStr)
    {
        if (par2ArrayOfStr.length >= 2)
        {
            EntityPlayerMP var3 = func_82359_c(par1ICommandSender, par2ArrayOfStr[0]);
            int var4 = parseIntWithMin(par1ICommandSender, par2ArrayOfStr[1], 1);
            int var5 = 1;
            int var6 = 0;

            if (Item.itemsList[var4] == null)
            {
                throw new NumberInvalidException("commands.give.notFound", new Object[] {Integer.valueOf(var4)});
            }
            else
            {
                if (par2ArrayOfStr.length >= 3)
                {
                    var5 = parseIntBounded(par1ICommandSender, par2ArrayOfStr[2], 1, 64);
                }

                if (par2ArrayOfStr.length >= 4)
                {
                    var6 = parseInt(par1ICommandSender, par2ArrayOfStr[3]);
                }

                ItemStack var7 = new ItemStack(var4, var5, var6);
                EntityItem var8 = var3.dropPlayerItem(var7);
                var8.delayBeforeCanPickup = 0;
                notifyAdmins(par1ICommandSender, "commands.give.success", new Object[] {Item.itemsList[var4].func_77653_i(var7), Integer.valueOf(var4), Integer.valueOf(var5), var3.getEntityName()});
            }
        }
        else
        {
            throw new WrongUsageException("commands.give.usage", new Object[0]);
        }
    }

    /**
     * Adds the strings available in this command to the given list of tab completion options.
     */
    public List addTabCompletionOptions(ICommandSender par1ICommandSender, String[] par2ArrayOfStr)
    {
        return par2ArrayOfStr.length == 1 ? getListOfStringsMatchingLastWord(par2ArrayOfStr, this.getPlayers()) : null;
    }

    protected String[] getPlayers()
    {
        return MinecraftServer.getServer().getAllUsernames();
    }

    /**
     * Return whether the specified command parameter index is a username parameter.
     */
    public boolean isUsernameIndex(int par1)
    {
        return par1 == 0;
    }
}