163 lines
6.0 KiB
JavaScript
163 lines
6.0 KiB
JavaScript
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("./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 log = require("./log.js"); //some very simple logging functions I made
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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 timer = false;
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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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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 (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) log.error("CONNECTION ERROR: Unable to locate discordapp.com to authenticate the bot (you are probably not connected to the internet).", 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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log.info("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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log.info("Setting up timer to check feed every " + Config.pollingInterval + " milliseconds");
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if (!timer) {
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setInterval(checkFeedAndPost, Config.pollingInterval);
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timer = true;
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}
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});
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bot.on("disconnect", function (err, code) {
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//do a bunch of logging
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log.event("Bot was disconnected! " + code ? code : "No disconnect code provided", "Discord.io");
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if (err) log.error("Bot disconnected!", err);
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log.info("Trying to reconnect bot");
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//then actually attempt to reconnect
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bot.connect();
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});
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bot.on("message", function (user, userID, channelID, message) {
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//check if the message contains a link, in the right channel, and not the latest link from the rss feed
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if (channelID === Config.channelID && linkRegExp.test(message) && (message !== latestFeedLink)) {
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log.event("Detected posted link in this message: " + message, "Discord.io");
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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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cacheLink(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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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) log.error("CONNECTION ERROR: Cannot resolve host (you are probably not connected to the internet)", 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) log.error("FEED ERROR: Error reading RSS feed.", 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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//check whether the latest link out the feed exists in our cache
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if (!cachedLinks.includes(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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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 (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("Bot appears to be disconnected! Attempting to reconnect...", err);
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//attempt to reconnect
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bot.connect();
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}
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}
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});
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//finally make sure the link is cached, so it doesn't get posted again
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cacheLink(latestLink);
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}
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else if (latestFeedLink != latestLink)
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//alternatively, if we have a new link from the feed, but its been posted already, just alert the console
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log.info("Didn't post new feed link because already detected as posted " + latestLink);
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//ensure our latest feed link variable is up to date, so we can track when the feed updates
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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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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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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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//extract an array of strings from the array of message objects
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var messageContents = messages.map((x) => { return x.content; }).reverse();
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for (var messageIdx in messageContents) {
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var message = messageContents[messageIdx];
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//test if the message contains a url
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if (linkRegExp.test(message))
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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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cacheLink(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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} |