129 lines
No EOL
3.8 KiB
JavaScript
129 lines
No EOL
3.8 KiB
JavaScript
/*
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* 🦉 Bubo RSS Reader
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* ====
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* Dead simple feed reader that renders an HTML
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* page with links to content from feeds organized by site
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*
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* Code: https://github.com/georgemandis/bubo-rss
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* Copyright (c) 2019 George Mandis (https://george.mand.is)
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* Version: 1.0.1 (11/14/2021)
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* Licensed under the MIT License (http://opensource.org/licenses/MIT)
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*/
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const fetch = require("node-fetch");
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const Parser = require("rss-parser");
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const parser = new Parser();
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const nunjucks = require("nunjucks");
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const env = nunjucks.configure({ autoescape: true });
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const feeds = require("./feeds.json");
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/**
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* Global filters for my Nunjucks templates
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*/
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env.addFilter("formatDate", function (dateString) {
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const formattedDate = new Date(dateString).toLocaleDateString()
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return formattedDate !== 'Invalid Date' ? formattedDate : dateString;
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});
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env.addGlobal('now', (new Date()).toUTCString());
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// parse RSS/XML or JSON feeds
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function parseFeed(response) {
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const contentType = response.headers.get("content-type")
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? response.headers.get("content-type").split(";")[0]
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: false;
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const rssFeed = [contentType]
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.map(item =>
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[
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"application/atom+xml",
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"application/rss+xml",
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"application/xml",
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"text/xml",
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"text/html" // this is kind of a gamble
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].includes(item)
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? response.text()
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: false
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)
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.filter(_ => _)[0];
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const jsonFeed = [contentType]
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.map(item =>
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["application/json", "application/feed+json"].includes(item) ? response.json() : false
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)
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.filter(_ => _)[0];
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return rssFeed || jsonFeed || false;
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}
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/*
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There's a little inconcistency with how feeds report certain things like
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title, links and timestamps. These helpers try to normalize that bit and
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provide an order-of-operations list of properties to look for.
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Note: these are tightly-coupled to the template and a personal preference.
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*/
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const getLink = (obj) => {
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const link_values = ["link", "url", "guid", "home_page_url"];
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const keys = Object.keys(obj);
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const link_property = link_values.find(link_value => keys.includes(link_value));
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return obj[link_property];
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}
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// fallback to URL for the title if not present (coupled to my template)
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const getTitle = (obj) => {
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const title_values = ["title", "url", "link"]; // fallback to url/link as title if omitted
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const keys = Object.keys(obj);
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const title_property = title_values.find(title_value => keys.includes(title_value));
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return obj[title_property];
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}
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// More dependable way to get timestamps
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const getTimestamp = (obj) => {
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const timestamp = new Date(obj.pubDate || obj.isoDate || obj.date || obj.date_published).getTime();
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return isNaN(timestamp) ? (obj.pubDate || obj.isoDate || obj.date || obj.date_published) : timestamp;
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}
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// fetch the feeds and build the object for our template
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(async () => {
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const contentFromAllFeeds = {};
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const errors = [];
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for (const group in feeds) {
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contentFromAllFeeds[group] = [];
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for (let index = 0; index < feeds[group].length; index++) {
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try {
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const response = await fetch(feeds[group][index]);
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const body = await parseFeed(response);
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const contents =
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typeof body === "string" ? await parser.parseString(body) : body;
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contents.feed = feeds[group][index];
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contents.title = getTitle(contents);
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contents.link = getLink(contents);
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contentFromAllFeeds[group].push(contents);
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// try to normalize date attribute naming
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contents?.items?.forEach(item => {
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item.timestamp = getTimestamp(item);
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item.title = getTitle(item);
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item.link = getLink(item);
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});
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} catch (error) {
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errors.push(feeds[group][index]);
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}
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}
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}
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const output = env.render("./src/template.html", {
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data: contentFromAllFeeds,
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errors: errors
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});
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console.log(output);
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})(); |