76 lines
2.5 KiB
JavaScript
76 lines
2.5 KiB
JavaScript
//my imports
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const DiscordUtil = require("discordjs-util");
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//external lib imports
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const Dns = require("dns");
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const Url = require("url");
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const FeedRead = require("feed-read");
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module.exports = class FeedData {
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constructor({ link, channelName, roleName, cachedLinks }) {
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this.link = link;
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this.channelName = channelName;
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this.roleName = roleName;
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this.cachedLinks = cachedLinks | [];
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}
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/**
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* Returns a promise providing all the links posted in the last 100 messages
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* @param {Discord.Guild} guild The guild this feed belongs to
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* @returns {Promise<string[]>} Links posted in last 100 messages
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*/
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updatePastPostedLinks(guild) {
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const channel = guild.channels.find(ch => ch.type === "text" && ch.name === this.channelName);
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return new Promise((resolve, reject) => {
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channel.fetchMessages({ limit: 100 })
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.then(messages => {
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messages.forEach(m => Array.prototype.push.apply(this.cachedLinks, getUrls(m))); //push all the links in each message into our links array
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resolve(this);
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})
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.catch(reject);
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});
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}
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check(guild) {
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Dns.resolve(Url.parse(this.link).host, err => { //check we can resolve the host, so we can throw an appropriate error if it fails
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if (err)
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DiscordUtil.dateError("Connection Error: Can't resolve host", err); //log our error if we can't resolve the host
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else
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FeedRead(this.link, (err, articles) => { //check the feed
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if (err)
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DiscordUtil.dateError(err);
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else {
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let latest = articles[0]; //extract the latest link
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latest = normaliseUrl(latest); //standardise it a bit
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//if we don't have it cached already, cache it and callback
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if (!this.cachedLinks.includes(latest)) {
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this.cachedLinks.push(latest);
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post(guild, latest);
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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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function post(guild, link){
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const channel = guild.channels.first(ch => ch.type === "text" && ch.name.toLower() === this.channelName.toLower());
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channel.send(link);
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}
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function normaliseUrl(url) {
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url = url.replace("https://", "http://"); //cheaty way to get around http and https not matching
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if (Url.parse(url).host.includes("youtu")) //detect youtu.be and youtube.com - yes I know it's hacky
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url = url.split("&")[0]; //quick way to chop off stuff like &feature=youtube
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url = url.replace("http://www.youtube.com/watch?v=", "http://youtu.be/"); //turn full url into share url
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return url;
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}
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function getUrls(str) {
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return str.match(/(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig);
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} |