node-haxball/examples/plugins/shareFiles_clientSide.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, "shareFiles_clientSide", false, { // "shareFiles_clientSide" 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 allows us to send files to other players.`,
    allowFlags: AllowFlags.JoinRoom // We allow this plugin to be activated on JoinRoom only.
  });


  this.defineVariable({
    name: "playerIdToSend",
    description: "Id of the player who will receive the data.",
    type: VariableType.PlayerId,
    value: 1
  });

  this.defineVariable({
    name: "dataToSend",
    description: "Data to send.",
    type: VariableType.File
  });

  this.defineVariable({
    name: "send",
    description: "Sends a file to the selected player.",
    type: VariableType.Void,
    value: ()=>{
      var {name, size} = that.dataToSend;
      if (size>10*1024*1024){
        console.warn("blocked attempt to send a file (size > 10mb)");
        return;
      }
      const reader = new FileReader();
      reader.addEventListener("load", (e) => {
        var writer = Impl.Stream.Writer.create(name.length+size+12, true);
        writer.writeInt32(that.playerIdToSend);
        writer.writeString(name);
        writer.writeArrayBuffer(e.target.result);
        that.room.sendBinaryCustomEvent(1, writer.toUint8Array(), 0);
      });
      reader.readAsArrayBuffer(that.dataToSend);
    }
  });

  var that = this;

  this.onBinaryCustomEvent = function(type, data, byId){
    if (type!=0 || byId!=0)
      return;
    var b = new Impl.Stream.Reader(new DataView(data.buffer, data.byteOffset, data.byteLength), true);
    var sourceId = b.readInt32();
    if (!that.room.getPlayer(sourceId))
      return;
    var name = b.readString();
    var contents = b.readUint8Array();
    console.log("received file from player "+sourceId);
    that.room.librariesMap.gui?.downloadFile(name, contents);
  };
}