src/game/java/net/minecraft/server/commands/DeOpCommands.java

package net.minecraft.server.commands;

import com.mojang.authlib.GameProfile;
import com.mojang.brigadier.CommandDispatcher;
import com.mojang.brigadier.context.CommandContext;
import com.mojang.brigadier.exceptions.CommandSyntaxException;
import com.mojang.brigadier.exceptions.SimpleCommandExceptionType;
import com.mojang.brigadier.suggestion.SuggestionsBuilder;
import java.util.Collection;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.Commands;
import net.minecraft.commands.SharedSuggestionProvider;
import net.minecraft.commands.arguments.GameProfileArgument;
import net.minecraft.network.chat.Component;
import net.minecraft.server.players.PlayerList;

public class DeOpCommands {
    private static final SimpleCommandExceptionType ERROR_NOT_OP = new SimpleCommandExceptionType(Component.translatable("commands.deop.failed"));

    public static void register(CommandDispatcher<CommandSourceStack> p_136889_) {
        p_136889_.register(
            Commands.literal("deop")
                .requires(p_136896_ -> p_136896_.hasPermission(3))
                .then(
                    Commands.argument("targets", GameProfileArgument.gameProfile())
                        .suggests((p_136893_, p_136894_) -> SharedSuggestionProvider.suggest(p_136893_.getSource().getServer().getPlayerList().getOpNames(), p_136894_))
                        .executes(p_136891_ -> deopPlayers(p_136891_.getSource(), GameProfileArgument.getGameProfiles(p_136891_, "targets")))
                )
        );
    }

    private static int deopPlayers(CommandSourceStack p_136898_, Collection<GameProfile> p_136899_) throws CommandSyntaxException {
        PlayerList playerlist = p_136898_.getServer().getPlayerList();
        int i = 0;

        for (GameProfile gameprofile : p_136899_) {
            if (playerlist.isOp(gameprofile)) {
                playerlist.deop(gameprofile);
                i++;
                p_136898_.sendSuccess(() -> Component.translatable("commands.deop.success", p_136899_.iterator().next().getName()), true);
            }
        }

        if (i == 0) {
            throw ERROR_NOT_OP.create();
        } else {
            p_136898_.getServer().kickUnlistedPlayers(p_136898_);
            return i;
        }
    }
}