'use strict';
const tmi = require('tmi.js');
const util = require('util');
const request = require('request-promise');
/**
* @class TwitchChatEmitter
* The Twitch chat implementation, based on the already existing module tmi.js (tmijs.org), adding more features and handlers to chat interation.
*
* @param {object} config The config object
* @param {boolean} config.debug Debug mode. If true, will show the debug messages.
* @param {object} config.logger The logger instance. If empty, the default logger will be used.
* @param {string[]} config.channels The twitch channels that will be used. This is required.
* @param {string} config.username The chat bot username. This is required.
* @param {string} config.password The chat bot OAUTH token password. You can get it at http://twitchapps.com/tmi/ . This is required.
* @param {boolean} config.reconnect Reconnect to Twitch when disconnected from server. Default: false
* @param {number} config.maxReconnectAttempts Max number of reconnection attempts (Default: Infinity)
* @param {number} config.maxReconnectInterval Max number of ms to delay a reconnection (Default: 30000)
* @param {number} config.reconnectDecay The rate of increase of the reconnect delay (Default: 1.5)
* @param {number} config.reconnectInterval Number of ms before attempting to reconnect (Default: 1000)
* @param {boolean} config.secure Use secure connection (SSL / HTTPS) (Overrides port to 443)
* @param {number} config.timeout Number of ms to disconnect if no responses from server (Default: 9999)
* @param {string} config.commandPrefix The prefix caracter for chat command. Default is "!".
*
* @param {object[]} config.triggers The triggers object array.
* @param {string} config.triggers[].name The name of the trigger. This is required.
* @param {string} config.triggers[].type The type of the trigger. Can be one 'word' or 'command'. This is required
* @param {string} config.triggers[].channel The channel in which the trigger will be used. This is required.
* @param {boolean} config.triggers[].chatTrigger Define if its a chat trigger. (Default: true)
* @param {boolean} config.triggers[].whisperTrigger Define if its a whisper trigger. (Default: false)
* @param {number} config.triggers[].minDelay The delay before the action is triggered again. (Default: 0)
* @param {string} config.triggers[].eventName The name of the event that will be triggered. If this is empty, no event will be emitted.
* @param {string} config.triggers[].responseText The text that will be sent to chat/whisper if the action is triggered. If this is empty, nothing will be sent.
*
* @param {object[]} config.timedMessages The timed messages array.
* @param {string} config.timedMessages[].message The message to be sent.
* @param {string} config.channel The channel in which the timed message will be sent. This is required.
* @param {number} config.timedMessages[].minDelay The minimum delay, in seconds, between this kind of message. This is required.
* @param {number} config.timedMessages[].minChatMessages The minimum ammount of messages in chat to send this message.
*
*/
function TwitchChatEmitter(config) {
if (!config.channels) throw new Error('Missing channels value.');
if (!config.username) throw new Error('Missing username value.');
if (!config.password) throw new Error('Missing password value.');
let options = {
options: {
debug:
config.debug ||
(process.env.LOG_LEVEL && process.env.LOG_LEVEL === 'debug'),
ignoreSelf: config.ignoreSelf
},
connection: {
reconnect: config.reconnect,
maxReconnectAttempts: config.maxReconnectAttempts,
maxReconnectInterval: config.maxReconnectInterval,
reconnectDecay: config.reconnectDecay,
reconnectInterval: config.reconnectInterval,
secure: config.secure,
timeout: config.timeout
},
identity: {
username: config.username,
password: config.password
},
channels: config.channels,
logger: config.logger,
commandPrefix: config.commandPrefix || '!',
timedMessages: config.timedMessages
};
//Create the local variables
this.chatMessageCount = 0;
this.triggersMap = new Map();
//Create the triggers maps
if (config.triggers) {
for (let i in config.triggers) {
let trigger = config.triggers[i];
let name =
trigger.type === 'command'
? options.commandPrefix + trigger.name
: trigger.name;
let triggerObj = {};
if (this.triggersMap.has(name)) {
triggerObj = this.triggersMap.get(name);
} else {
triggerObj.items = [];
triggerObj.lastDate = null;
}
triggerObj.items.push(trigger);
this.triggersMap.set(name, triggerObj);
}
}
tmi.Client.call(this, options);
if (config.logger) {
this.log = config.logger;
}
this.on('chat', (channel, userstate, message, self) => {
_handleMessage(this, 'chat', channel, userstate, message, self);
});
this.on('whisper', (from, userstate, message, self) => {
_handleMessage(this, 'whisper', null, userstate, message, self);
});
this.chatEmotes = null;
}
/**
* Connect to the chat.
*/
TwitchChatEmitter.prototype.connect = async function() {
try {
let emotes = await request({
url: 'https://twitchemotes.com/api_cache/v3/global.json',
method: 'GET'
});
this.chatEmotes = JSON.parse(emotes);
let result = await tmi.Client.prototype.connect.call(this);
//Prepare the timed messages
if (this.getOptions().timedMessages) {
this.getOptions().timedMessagesTimerIds = [];
for (let i in this.getOptions().timedMessages) {
let message = this.getOptions().timedMessages[i];
if (!message.minDelay) {
throw new Error(
'Missing minimum delay constraint for timed message.'
);
}
if (!message.channel) {
throw new Error(
'Missing the channel for the timed message.'
);
}
let timedMessage = {
message: message.message,
channel: message.channel,
minDelay: message.minDelay,
minChatMessages: message.minChatMessages,
messageCount: 0, //Number of messages sent before the last time it was sent.
lastTrigger: null
};
if (message.minDelay) {
let timerId = setInterval(() => {
_triggerTimedMessage(this, timedMessage);
}, message.minDelay * 1000);
this.getOptions().timedMessagesTimerIds.push(timerId);
}
}
}
return result;
} catch (err) {
throw err;
}
};
TwitchChatEmitter.prototype.disconnect = async function() {
if (this.getOptions().timedMessagesTimerIds) {
for (let i in this.getOptions().timedMessagesTimerIds) {
clearInterval(this.getOptions().timedMessagesTimerIds[i]);
}
}
return tmi.Client.prototype.disconnect.call(this);
};
/**
* Handle a chat message, firing the specific events.
* @private
* @param {string} channel The channel in which the message was sent.
* @param {object} userstate The userstate object as described in the tmi 'chat 'event.
* @param {string} message The chat message.
* @param {bool} self Whether is the bot user or not.
*/
async function _handleMessage(chat, type, channel, userstate, message, self) {
message = message.trim();
let finalMessage = message;
chat.chatMessageCount++;
try {
if (!self || process.env.NODE_ENV === 'test') {
let words = _getMessageWords(
message,
chat.getOptions().commandPrefix
);
for (let i in words) {
if (chat.triggersMap.has(words[i])) {
let triggers = chat.triggersMap.get(words[i]);
for (let j in triggers.items) {
let trigger = triggers.items[j];
if (
!trigger.minDelay ||
!triggers.lastDate ||
new Date().getTime() - trigger.minDelay >
triggers.lastDate.getTime()
) {
if (trigger.eventName) {
chat.emit(
trigger.eventName,
channel,
userstate,
message,
self
);
}
if (trigger.responseText) {
if (type === 'chat') {
await chat.say(
channel,
trigger.responseText
);
} else if (type === 'whisper') {
await chat.whisper(
userstate.username,
trigger.responseText
);
}
}
}
}
triggers.lastDate = new Date();
}
if (chat.chatEmotes[words[i]]) {
let emoteHtml =
'<img class="chat-image" src="' +
encodeURI(
'https://static-cdn.jtvnw.net/emoticons/v1/' +
chat.chatEmotes[words[i]].id +
'/1.0'
) +
'">';
finalMessage = finalMessage.replace(words[i], emoteHtml);
}
}
}
/**
* The chat message parsed to html, with twitch emotes.
* @event TwitchChatEmitter#Chat:chat_parsed
* @param {string} channel The channel in which the command was sent.
* @param {object} userstate The userstate object.
* @param {string} message The parsed message.
* @param {bool} self Whether the command was sent to the user bot or not.
*/
if (type === 'chat') {
chat.messageCount++;
chat.emit('chat_parsed', channel, userstate, finalMessage, self);
}
} catch (err) {
chat.log.error(err);
}
}
function _getMessageWords(message, commandPrefix) {
let reg = new RegExp(
'[.,!?@#$%ยจ&*(){}\\[\\]|\\/:;<>]'.replace(commandPrefix, ''),
'g'
);
return message.replace(reg, '').split(' ');
}
function _triggerTimedMessage(chat, timedMessage) {
if (
!timedMessage.minChatMessages ||
chat.chatMessageCount >=
timedMessage.minChatMessages * (timedMessage.messageCount + 1)
) {
timedMessage.messageCount++;
timedMessage.lastTrigger = new Date();
chat.say(timedMessage.channel, timedMessage.message);
}
}
util.inherits(TwitchChatEmitter, tmi.Client);
/* test code */
if (process.env.NODE_ENV === 'test') {
TwitchChatEmitter.prototype._handleMessage = _handleMessage;
TwitchChatEmitter.prototype._getMessageWords = _getMessageWords;
TwitchChatEmitter.prototype._triggerTimedMessage = _triggerTimedMessage;
}
/* end-test code */
module.exports = TwitchChatEmitter;