node-haxball/examples/plugins/breakConnection.js

The most powerful and lightweight API that allows you to develop your original Haxball(www.haxball.com) host, client, and standalone applications both on node.js and browser environments and also includes every possible hack and functionality that you can

module.exports = function(API){
  const { OperationType, VariableType, ConnectionState, AllowFlags, Direction, CollisionFlags, CameraFollow, BackgroundType, GamePlayState, BanEntryType, Callback, Utils, Room, Replay, Query, Library, RoomConfig, Plugin, Renderer, Errors, Language, EventFactory, Impl } = API;

  Object.setPrototypeOf(this, Plugin.prototype);
  Plugin.call(this, "breakConnection", true, { // "breakConnection" is plugin's name, "true" means "activated just after initialization". Every plugin should have a unique name.
    version: "0.1",
    author: "abc",
    description: `This plugin can make a player leave not by kicking him, but by breaking his connection. This should be improved with a permission mechanism.
    Available commands: 
    - !breakKick [id]: Break the connection of the player whose playerId=[id].`,
    allowFlags: AllowFlags.CreateRoom // We allow this plugin to be activated on CreateRoom only.
  });

  var connectionShouldBreak = {};

  var breakConnection = function(byPlayerId, playerId){
    if (isNaN(byPlayerId) || isNaN(playerIdToBeControlled)) // parameters must be integers
      return;
    /*
    if (!breakConnectionPermitted[byPlayerId]) // example for custom permission logic
      return;
    */
    connectionShouldBreak[playerId] = true; // mark player
  };

  this.onOperationReceived = function(type, msg, globalFrameNo, clientFrameNo, customData){ // this is host-only

    var playerId = msg.byId // find out who sent this message
    if (connectionShouldBreak[playerId]) // if player is marked
      throw ""; // connection is broken here. playerId will leave by himself without triggering a kick/ban event.
    
    switch (type){
      case OperationType.SendChat:{ // if someone sent a chat message
        /*
        var m = msg.text;
        if (m.startsWith("!")){  // custom chat logic for extra commands
        */
        if (customData?.isCommand){ // same as above 2 lines.
          var arr = customData.data; // same as var arr = m.trimEnd().split(" ");
          switch (arr[0]){
            case "!breakKick":
              breakConnection(playerId, parseInt(arr[1]));
              break;
          }
          //return false; // do not block this event from being processed. it is done automatically in onAfterOperationReceived. 
        }
        break;
      }
    }
    return true;
  };

  this.onPlayerLeave = function(playerObj, reason, isBanned, byId, customData){
    // get player's id
    var id = playerObj.id;

    // free extra memory allocated
    delete connectionShouldBreak[id];
  };
};