Mercurial > addons > firefox-addons > feed-preview
view content_scripts/feed-probe.js @ 51:dc25aa2bc628
Revert flexbox layout from extension.css in the entry style sheet
This reverts laying out the contents of the body according to the flexbox model
since it has, among other things, the unwanted effect of stretching images.
author | Guido Berhoerster <guido+feed-preview@berhoerster.name> |
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date | Fri, 06 Sep 2019 13:16:48 +0200 |
parents | 76e23b361e92 |
children | ede87e1004f9 |
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/* * Copyright (C) 2018 Guido Berhoerster <guido+feed-preview@berhoerster.name> * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 'use strict'; const TIMEOUT_MAX = 800; // ms function getFeeds() { let urlsFeeds = new Map(); let elements = document.querySelectorAll(':-moz-any(link, a)[href]' + '[rel~=alternate]:-moz-any([type="application/atom+xml"], ' + '[type="application/rss+xml"])'); for (let element of elements) { if (element.href === document.URL) { // do not indicate the availability of a feed if the current // document is already a feed preview continue; } if (!element.href.match(/^https?:\/\//)) { continue; } urlsFeeds.set(element.href, { href: element.href, title: element.title || browser.i18n.getMessage('defaultFeedTitle'), type: element.type }) } return Array.from(urlsFeeds.values()); } function probeLinkedFeeds() { if (document.documentElement.nodeName.toUpperCase() !== 'HTML') { return; } let feeds = getFeeds(); if (feeds.length === 0) { return; } // the listener on the background page might not be ready, keep trying to // send the message with an exponential backoff until TIMEOUT_MAX is // reached let timeout = 0; let sendFeeds = () => { browser.runtime.sendMessage(feeds).catch(e => { timeout = (timeout > 0) ? timeout * 2 : 100; if (timeout > TIMEOUT_MAX) { console.log(`Error: failed to message the background page: ` + ` ${e.message}`); return; } setTimeout(sendFeeds, timeout); }); }; setTimeout(sendFeeds, timeout); } probeLinkedFeeds();