207 lines
7.7 KiB
JavaScript
207 lines
7.7 KiB
JavaScript
//external library imports
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var Dns = require("dns"); //for connectivity checking
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var Url = require("url"); //for url parsing
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var Uri = require("urijs"); //for finding urls within message strings
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var Discord = require("discord.io"); //for obvious reasons
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var FeedRead = require("feed-read"); //for rss feed reading
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//my imports
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var Log = require("./log.js"); //some very simple logging functions I made
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var BotConfig = require("./bot-config.json"); //bot config file containing bot token
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var Config = require("./config.json"); //config file containing other settings
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var DiscordClient = {
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bot: null,
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feedTimer: null,
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reconnectTimer: null,
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startup: function () {
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//check if we can connect to discordapp.com to authenticate the bot
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Dns.resolve("discordapp.com", function (err) {
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if (err) Log.error("CONNECTION ERROR: Unable to locate discordapp.com to authenticate the bot", err);
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else {
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//if there was no error, go ahead and create and authenticate the bot
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DiscordClient.bot = new Discord.Client({
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token: BotConfig.token,
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autorun: true
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});
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//set up the bot's event handlers
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DiscordClient.bot.on("ready", DiscordClient.onReady);
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DiscordClient.bot.on("disconnect", DiscordClient.onDisconnect);
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DiscordClient.bot.on("message", DiscordClient.onMessage);
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}
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});
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},
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onReady: function () {
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Log.info("Registered/connected bot " + DiscordClient.bot.username + " - (" + DiscordClient.bot.id + ")");
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Log.info("Setting up timer to check feed every " + Config.pollingInterval + " milliseconds");
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DiscordClient.feedTimer = setInterval(Feed.checkAndPost, Config.pollingInterval); //set up the timer to check the feed
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//we need to check past messages for links on startup, but also on reconnect because we don't know what has happened during the downtime
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DiscordClient.checkPastMessagesForLinks();
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},
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onDisconnect: function (err, code) {
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Log.event("Bot was disconnected! " + err ? err : "" + code ? code : "No disconnect code provided.\nClearing the feed timer and starting reconnect timer", "Discord.io");
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clearInterval(DiscordClient.feedTimer); //stop the feed timer
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//set up a timer to try reconnect every 5sec
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DiscordClient.reconnectTimer = setInterval(function () {
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try {
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DiscordClient.bot.connect();
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}
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catch (ex) {
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Log.error("Exception thrown trying to reconnect bot." + ex.message);
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}
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});
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},
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onMessage: function (user, userID, channelID, message) {
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//check if the message is in the right channel, contains a link, and is not the latest link from the rss feed
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if (channelID === Config.channelID && Links.messageContainsLink(message) && (message !== Links.latestFromFeed)) {
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Log.event("Detected posted link in this message: " + message, "Discord.io");
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//extract the url from the string, and cache it
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Uri.withinString(message, function (url) {
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Links.cache(Links.standardise(url));
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return url;
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});
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}
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},
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checkPastMessagesForLinks: function () {
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var limit = 100;
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Log.info("Attempting to check past " + limit + " messages for links");
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//get the last however many messsages from our discord channel
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DiscordClient.bot.getMessages({
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channelID: Config.channelID,
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limit: limit
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}, function (err, messages) {
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if (err) Log.error("Error fetching discord messages.", err);
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else {
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Log.info("Pulled last " + messages.length + " messages, scanning for links");
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var messageContents = messages.map((x) => { return x.content; }).reverse(); //extract an array of strings from the array of message objects
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for (var messageIdx in messageContents) {
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var message = messageContents[messageIdx];
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if (Links.messageContainsLink(message)) //test if the message contains a url
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//detect the url inside the string, and cache it
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Uri.withinString(message, function (url) {
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Links.cache(url);
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return url;
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});
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}
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}
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});
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}
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};
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var YouTube = {
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url: {
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share: "http://youtu.be/",
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full: "http://www.youtube.com/watch?v=",
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convertShareToFull: function (shareUrl) {
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return shareUrl.replace(YouTube.url.share, YouTube.url.full);
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},
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convertFullToShare: function (fullUrl) {
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var shareUrl = fullUrl.replace(YouTube.url.full, YouTube.url.share);
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if (shareUrl.includes("&"))
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shareUrl = shareUrl.slice(0, fullUrl.indexOf("&"));
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return shareUrl;
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}
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},
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};
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var Links = {
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standardise: function (link) {
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link = link.replace("https://", "http://"); //cheaty way to get around http and https not matching
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if(Config.youtubeMode) link = link.split("&")[0]; //quick way to chop off stuff like &feature=youtube etc
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return link;
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},
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messageContainsLink: function (message) {
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var messageLower = message.toLowerCase();
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return messageLower.includes("http://") || messageLower.includes("https://") || messageLower.includes("www.");
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},
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cached: [],
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latestFromFeed: "",
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cache: function (link) {
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link = Links.standardise(link);
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if (Config.youtubeMode && link.includes(YouTube.url.full)) {
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link = YouTube.url.convertFullToShare(link);
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}
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//store the new link if not stored already
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if (!Links.cached.includes(link)) {
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Links.cached.push(link);
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Log.info("Cached URL: " + link);
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}
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//get rid of the first array element if we have reached our cache limit
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if (Links.cached.length > (Config.numLinksToCache || 10))
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Links.cached.shift();
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},
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checkCache: function (link) {
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link = Links.standardise(link);
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if (Config.youtubeMode && link.includes(YouTube.url.full)) {
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return Links.cached.includes(YouTube.url.convertFullToShare(link));
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}
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return Links.cached.includes(link);
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},
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validateAndPost: function (err, articles) {
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if (err) Log.error("FEED ERROR: Error reading RSS feed.", err);
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else {
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var latestLink = Links.standardise(articles[0].link); //get the latest link and check if it has already been posted and cached
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//check whether the latest link out the feed exists in our cache
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if (!Links.checkCache(latestLink)) {
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if (Config.youtubeMode && latestLink.includes(YouTube.url.full))
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latestLink = YouTube.url.convertFullToShare(latestLink);
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Log.info("Attempting to post new link: " + latestLink);
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//send a messsage containing the new feed link to our discord channel
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DiscordClient.bot.sendMessage({
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to: Config.channelID,
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message: latestLink
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}, function (err, message) {
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if (err) {
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Log.error("ERROR: Failed to send message: " + message.substring(0, 15) + "...", err);
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//if there is an error posting the message, check if it is because the bot isn't connected
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if (DiscordClient.bot.connected)
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Log.info("Connectivity seems fine - I have no idea why the message didn't post");
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else {
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Log.error("DiscordClient appears to be disconnected! Attempting to reconnect...", err);
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DiscordClient.bot.connect(); //attempt to reconnect
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}
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}
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});
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Links.cache(latestLink); //finally make sure the link is cached, so it doesn't get posted again
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}
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else if (Links.latestFromFeed != latestLink)
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Log.info("Didn't post new feed link because already detected as posted " + latestLink); //alternatively, if we have a new link from the feed, but its been posted already, just alert the console
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Links.latestFromFeed = latestLink; //ensure our latest feed link variable is up to date, so we can track when the feed updates
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}
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}
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};
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var Feed = {
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urlObj: Url.parse(Config.feedUrl),
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checkAndPost: function () {
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Dns.resolve(Feed.urlObj.host, function (err) { //check that we have an internet connection (well not exactly - check that we have a connection to the host of the feedUrl)
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if (err) Log.error("CONNECTION ERROR: Cannot resolve host.", err);
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else FeedRead(Config.feedUrl, Links.validateAndPost);
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});
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}
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};
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//IIFE to kickstart the bot when the app loads
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(function () {
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DiscordClient.startup();
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})(); |