@thaunknown/web-irc/commands/handler.js

A TypeScript port of irc-framework's WebIRC client, without the bloat of unnceessary packages.

import EventEmitter from 'events';
import ircNumerics from './numerics';
import IrcCommand from './command';
import { reduce, find, uniq } from '../util';
import registration from './handlers/registration';
import channel from './handlers/channel';
import user from './handlers/user';
import messaging from './handlers/messaging';
import misc from './handlers/misc';
import generics from './handlers/generics';
export default class IrcCommandHandler extends EventEmitter {
    constructor(client) {
        super();
        // Adds an 'all' event to .emit()
        this.addAllEventName();
        this.client = client;
        this.connection = client.connection;
        this.network = client.network;
        this.handlers = [];
        this.request_extra_caps = [];
        this.resetCache();
        this.loadHandlers();
    }
    loadHandlers() {
        registration(this);
        channel(this);
        user(this);
        messaging(this);
        misc(this);
        generics(this);
    }
    dispatch(message) {
        const irc_command = new IrcCommand(message.command.toUpperCase(), message);
        // Batched commands will be collected and executed as a transaction
        const batch_id = irc_command.getTag('batch');
        if (batch_id) {
            const cache_key = 'batch.' + batch_id;
            if (this.hasCache(cache_key)) {
                const cache = this.cache(cache_key);
                cache.commands.push(irc_command);
            }
            else {
                // If we don't have this batch ID in cache, it either means that the
                // server hasn't sent the starting batch command or that the server
                // has already sent the end batch command.
            }
        }
        else {
            this.executeCommand(irc_command);
        }
    }
    executeCommand(irc_command) {
        let command_name = irc_command.command;
        // Check if we have a numeric->command name- mapping for this command
        if (ircNumerics[irc_command.command.toUpperCase()]) {
            command_name = ircNumerics[irc_command.command.toUpperCase()];
        }
        if (this.handlers[command_name]) {
            this.handlers[command_name](irc_command, this);
        }
        else {
            this.emitUnknownCommand(irc_command);
        }
    }
    requestExtraCaps(cap) {
        this.request_extra_caps = uniq(this.request_extra_caps.concat(cap));
    }
    addHandler(command, handler) {
        if (typeof handler !== 'function') {
            return false;
        }
        this.handlers[command] = handler;
    }
    emitUnknownCommand(command) {
        this.emit('unknown command', command);
    }
    // Adds an 'all' event to .emit()
    addAllEventName() {
        const original_emit = this.emit;
        this.emit = function () {
            const args = Array.prototype.slice.call(arguments, 0);
            original_emit.apply(this, ['all'].concat(args));
            original_emit.apply(this, args);
        };
    }
    /**
   * Convert a mode string such as '+k pass', or '-i' to a readable
   * format.
   * [ { mode: '+k', param: 'pass' } ]
   * [ { mode: '-i', param: null } ]
   */
    parseModeList(mode_string, mode_params) {
        const chanmodes = this.network.options.CHANMODES || [];
        let prefixes = this.network.options.PREFIX || [];
        let always_param = (chanmodes[0] || '').concat((chanmodes[1] || ''));
        const modes = [];
        let i;
        let j;
        let add;
        if (!mode_string) {
            return modes;
        }
        prefixes = reduce(prefixes, function (list, prefix) {
            list.push(prefix.mode);
            return list;
        }, []);
        always_param = always_param.split('').concat(prefixes);
        const hasParam = function (mode, isAdd) {
            const matchMode = function (m) {
                return m === mode;
            };
            if (find(always_param, matchMode)) {
                return true;
            }
            if (isAdd && find((chanmodes[2] || '').split(''), matchMode)) {
                return true;
            }
            return false;
        };
        j = 0;
        for (i = 0; i < mode_string.length; i++) {
            switch (mode_string[i]) {
                case '+':
                    add = true;
                    break;
                case '-':
                    add = false;
                    break;
                default:
                    if (hasParam(mode_string[i], add)) {
                        modes.push({ mode: (add ? '+' : '-') + mode_string[i], param: mode_params[j] });
                        j++;
                    }
                    else {
                        modes.push({ mode: (add ? '+' : '-') + mode_string[i], param: null });
                    }
            }
        }
        return modes;
    }
    /**
       * Cache object for commands buffering data before emitting them
       * eg.
       * var cache = this.cache('userlist');
       * cache.nicks = [];
       * cache.destroy();
       */
    cache(id) {
        let cache = this._caches[id];
        if (!cache) {
            const destroyCacheFn = (cacheToDestroy, idInCache) => {
                return function () {
                    delete cacheToDestroy[idInCache];
                };
            };
            // We don't want the destoryCache to be iterable
            cache = Object.defineProperty({}, 'destroy', {
                enumerable: false,
                configurable: false,
                value: destroyCacheFn(this._caches, id)
            });
            this._caches[id] = cache;
        }
        return cache;
    }
    hasCache(id) {
        return this._caches && Object.prototype.hasOwnProperty.call(this._caches, id);
    }
    resetCache() {
        this._caches = Object.create(null);
    }
}
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