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Add support for domain-specific feed detection

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Refactor the `findFeeds` function to allow easy addition of custom
finder functions. This change does three things:

1. Breaks the iTunes and standard feed detection logic into their own respective functions
2.  Adds a YouTube feed detection function
3. Creates a mapping to support custom feed detection functions for
additional domains

Fixes #34.
This commit is contained in:
Jon Banafato 2019-10-26 21:26:01 -04:00
parent 83326eeec0
commit e8f697ade2
1 changed files with 70 additions and 58 deletions
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128
rsspreview.js
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@ -336,29 +336,68 @@
getting.then(onOptions, onError);
function findFeeds() {
let feeds = {};
function registerFeeds(feeds) {
if (Object.keys(feeds).length > 0) {
function handleResponse(message) {
}
function handleError(error) {
//console.log(error);
}
browser.runtime.sendMessage(feeds).then(handleResponse, handleError);
function registerFeeds(feeds) {
if (Object.keys(feeds).length > 0) {
function handleResponse(message) {
}
function handleError(error) {
//console.log(error);
}
browser.runtime.sendMessage(feeds).then(handleResponse, handleError);
}
}
var async_send = false;
function findiTunesPodcastsFeeds() {
let match = document.URL.match(/id(\d+)/)
if (match) {
let feeds = {};
let itunesid = match[1];
var xhr = new XMLHttpRequest();
xhr.open('GET', "https://itunes.apple.com/lookup?id="+itunesid+"&entity=podcast");
xhr.onload = function () {
if (xhr.readyState === xhr.DONE) {
if (xhr.status === 200) {
let res = JSON.parse(xhr.responseText);
if ("results" in res) {
let pod = res["results"][0];
let title = pod["collectionName"] || document.title;
let url = pod["feedUrl"];
if (url) {
feeds[url] = title;
}
}
}
}
registerFeeds(feeds);
};
xhr.send();
}
}
function findYouTubeFeeds() {
let match = document.URL.match(/channel\/([a-zA-Z0-9]+)/);
if (match) {
let feeds = {};
let channelId = match[1];
let url = `https://www.youtube.com/feeds/videos.xml?channel_id=${channelId}`;
let title = document.title;
feeds[url] = title;
registerFeeds(feeds);
}
}
// The default function used to find feeds if a domain-specific function doesn't exist.
// Parse the document's HTML looking for link tags pointing to the feed URL.
function defaultFindFeeds() {
let feeds = {};
document.querySelectorAll("link[rel='alternate']").forEach( (elem) => {
let type_attr = elem.getAttribute('type');
if (!type_attr) {
return;
@ -366,55 +405,28 @@
let type = type_attr.toLowerCase();
if (type.includes('rss') || type.includes('atom') || type.includes('feed')) {
let title = elem.getAttribute('title');
let url = elem.href;
if (url) {
feeds[url] = (title ? title : url);
}
}
});
if (document.domain == "itunes.apple.com" || document.domain == "podcasts.apple.com") {
let match = document.URL.match(/id(\d+)/)
if (match) {
let itunesid = match[1];
var xhr = new XMLHttpRequest();
xhr.open('GET', "https://itunes.apple.com/lookup?id="+itunesid+"&entity=podcast");
xhr.onload = function () {
if (xhr.readyState === xhr.DONE) {
if (xhr.status === 200) {
let res = JSON.parse(xhr.responseText);
if ("results" in res) {
let pod = res["results"][0];
let title = pod["collectionName"] || document.title;
let url = pod["feedUrl"];
if (url) {
feeds[url] = title;
}
}
}
}
registerFeeds(feeds);
};
async_send = true;
xhr.send();
}
}
if (!async_send)
registerFeeds(feeds);
registerFeeds(feeds);
}
const domainFeedFinders = new Map([
["itunes.apple.com", findiTunesPodcastsFeeds],
["podcasts.apple.com", findiTunesPodcastsFeeds],
["www.youtube.com", findYouTubeFeeds],
]);
function findFeeds() {
// Look up a feed detection function based on the domain.
// If a domain-specific function doesn't exist, fall back to a default.
let finder = domainFeedFinders.get(document.domain) || defaultFindFeeds;
finder();
}
})();