121 lines
4.6 KiB
JavaScript
121 lines
4.6 KiB
JavaScript
var console = require("console"); //for console logging
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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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var BotConfig = require("./botConfig.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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//get a URL object from the feedUrl so we can examine it and check connectivity later
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var url = Url.parse(Config.feedUrl);
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//placeholder for our bot - we need to check for connectivity before assigning this though
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var bot;
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var latestFeedLink = "";
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var linkRegExp = new RegExp(["http", "https", "www"].join("|"));
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var cachedLinks = [];
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//caches a link so we can check again later
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function cacheLink(link) {
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//cheaty way to get around http and https not matching
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link = link.replace("https://", "http://");
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//store the new link if not stored already
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if (!cachedLinks.includes(link)) {
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cachedLinks.push(link);
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logEvent("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 (cachedLinks.length > (Config.numLinksToCache || 10))
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cachedLinks.shift();
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}
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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) reportError("CONNECTION ERROR: Unable to locate discordapp.com to authenticate the bot (you are probably not connected to the internet). Details: " + (err.message || 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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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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//when the bot is ready, set a polling interval for the rss feed
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bot.on("ready", function () {
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logEvent(new Date().toLocaleString() + " Registered bot " + bot.username + " - (" + bot.id + ")");
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//as we don't have any links cached, we need to check recent messages
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checkPreviousMessagesForLinks();
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logEvent("Setting up timer to check feed every " + Config.pollingInterval + " milliseconds");
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setInterval(checkFeedAndPost, Config.pollingInterval);
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});
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bot.on("message", function (user, userID, channelID, message) {
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//check if the message is a link, cache it if it is
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if (linkRegExp.test(message)) {
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logEvent("Detected user posted link: " + message);
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cacheLink(Uri.withinString(message, function (url) { return url; }));
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}
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});
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}
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});
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function checkFeedAndPost() {
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//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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Dns.resolve(url.host, function (err) {
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if (err) reportError("CONNECTION ERROR: Cannot resolve host (you are probably not connected to the internet). Details: " + (err.message || err));
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else FeedRead(Config.feedUrl, checkLinkAndPost);
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});
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}
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//checks if the link has been posted previously, posts if not
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function checkLinkAndPost(err, articles) {
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if (err) reportError("FEED ERROR: Error reading RSS feed. Details: " + (err.message || err));
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else {
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//get the latest link and check if it has already been posted and cached
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var latestLink = articles[0].link.replace("https", "http");
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if (!cachedLinks.includes(latestLink)) {
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logEvent("Attempting to post new link: " + latestLink);
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bot.sendMessage({
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to: Config.channelID,
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message: latestLink
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});
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cacheLink(latestLink);
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}
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else if (latestFeedLink != latestLink)
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logEvent("Didn't post new feed link because already detected as posted " + latestLink);
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latestFeedLink = latestLink;
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}
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}
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//gets last 100 messages and extracts any links found (for use on startup)
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function checkPreviousMessagesForLinks() {
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var limit = 100;
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logEvent("Attempting to check past " + limit + " messages for links");
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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) reportError("Error fetching discord messages. Details: " + (err.message || err));
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else {
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logEvent("Pulled last " + messages.length + " messages, scanning for links");
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var messageContents = messages.map((x) => { return x.content; }).reverse();
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for (var message in messageContents) {
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message = messageContents[message];
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if (linkRegExp.test(message))
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cacheLink(Uri.withinString(message, function (url) { return url; }));
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}
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}
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});
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}
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function logEvent(message) {
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console.log(new Date().toLocaleString() + " " + message);
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}
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//logs error to console with a timestamp
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function reportError(message) {
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console.log(new Date().toLocaleString() + " ERROR: " + message);
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} |