Mercurial > addons > firefox-addons > feed-preview
view js/background.js @ 22:38b20de704a0
Use seperate grey icon for the page action
This does not stand out so much as the orange icon espeacially when using dark
themes and should be readable on any theme since there is no transparency.
Currently there is neither a way for addons to specify themed icons for page
actions nor is it possible to use the browser's foreground and background color
as native page action icons do.
author | Guido Berhoerster <guido+feed-preview@berhoerster.name> |
---|---|
date | Sun, 16 Dec 2018 10:22:19 +0100 |
parents | a59d322e5826 |
children | 688d75e554e0 |
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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'; import * as feedParser from './feed-parser.js'; import {renderFeedPreview} from './feed-preview.js'; const FEED_READERS_PRESET = [ { title: 'Feedly', urlTemplate: 'https://feedly.com/#subscription/feed/%s' }, { title: 'FlowReader', urlTemplate: 'https://www.flowreader.com/subscribe?url=%s' }, { title: 'InoReader', urlTemplate: 'https://www.inoreader.com/feed/%s' }, { title: 'Kouio', urlTemplate: 'https://kouio.com/subscribe?url=%s' }, { title: 'My Yahoo', urlTemplate: 'https://add.my.yahoo.com/rss?url=%s' }, { title: 'Netvibes', urlTemplate: 'https://www.netvibes.com/subscribe.php?url=%s' }, { title: 'NewsBlur', urlTemplate: 'https://www.newsblur.com/?url=%s' }, { title: 'The Old Reader', urlTemplate: 'https://theoldreader.com/feeds/subscribe?url=%s' } ]; const FEED_MAGIC = [ '<rss', '<feed', feedParser.XMLNS.ATOM03, feedParser.XMLNS.ATOM10, feedParser.XMLNS.RSS09, feedParser.XMLNS.RSS10 ]; var tabsFeeds = new Map(); var tabsFeedPreviews = new Map(); var fetchingFeedPreview = fetch('web_resources/feed-preview.xhtml') .then(response => response.text()); function parseContentType(header) { let contentType = { mediaType: '', charset: 'utf-8' }; let parts = header.toLowerCase().split(';'); contentType.mediaType = parts.shift().trim(); for (let parameter of parts) { let [, name, value, ] = parameter.trim().split(/([^=]+)="?([^"]*)"?/); if (name.toLowerCase() === 'charset') { contentType.charset = value.toLowerCase(); break; } } return contentType; } async function handleFeed(inputText, tabId, url) { // fast-path: eliminate XML documents which cannot be Atom nor RSS feeds let inputTextStart = inputText.substring(0, 512); if (!FEED_MAGIC.some(element => inputTextStart.includes(element))) { return inputText; } let feed; try { feed = (new feedParser.FeedParser).parseFromString(inputText, url); } catch (e) { if (e instanceof feedParser.ParserError || e instanceof feedParser.UnsupportedFeedTypeError) { // let the browser deal with non-well formed XML or XML documents // which are not supported Atom or RSS feeds return inputText; } throw e; } console.log(`parsed feed ${url}:\n`, feed); // mark this feed preview for content script injection tabsFeedPreviews.set(tabId, url); // render the preview document let feedPreviewDocument = new DOMParser() .parseFromString(await fetchingFeedPreview, 'text/html'); renderFeedPreview(feedPreviewDocument, feed); return new XMLSerializer().serializeToString(feedPreviewDocument); } browser.webRequest.onHeadersReceived.addListener(details => { if (details.statusCode !== 200) { return {}; } let contentTypeIndex = details.responseHeaders.findIndex(header => header.name.toLowerCase() === 'content-type' && typeof header.value !== 'undefined'); if (contentTypeIndex < 0) { // no Content-Type header found return {}; } let headerValue = details.responseHeaders[contentTypeIndex].value let contentType = parseContentType(headerValue); // until content handlers become available to webextensions // (https://bugzilla.mozilla.org/show_bug.cgi?id=1457500) intercept all // responses and change the content type from application/atom+xml or // application/rss+xml to application/xml which will then be probed for // Atom or RSS content switch (contentType.mediaType) { case 'application/atom+xml': case 'application/rss+xml': case 'application/rdf+xml': case 'application/xml': case 'text/xml': break; default: // non-XML media type return {}; } console.log(`response is an XML document\n`, `media type: ${contentType.mediaType}\n`, `charset: ${contentType.charset}`); let decoder; try { decoder = new TextDecoder(contentType.charset); } catch (e) { if (e instanceof RangeError) { // unsupported charset return {}; } else { throw e; } } let encoder = new TextEncoder(); let inputText = ''; let filter = browser.webRequest.filterResponseData(details.requestId); filter.addEventListener('data', ev => { inputText += decoder.decode(ev.data, {stream: true}); }); filter.addEventListener('stop', async ev => { let result = await handleFeed(inputText, details.tabId, details.url); filter.write(encoder.encode(result)); filter.close(); }); details.responseHeaders[contentTypeIndex] = { name: 'Content-Type', value: `application/xml;charset=${contentType.charset}` }; return {responseHeaders: details.responseHeaders}; }, {urls: ['http://*/*', 'https://*/*'], types: ['main_frame']}, ['blocking', 'responseHeaders']); browser.runtime.onMessage.addListener((request, sender, sendResponse) => { let tab = sender.tab; if (typeof tab !== 'undefined') { // content script sending feeds tabsFeeds.set(tab.id, request); browser.pageAction.show(tab.id); } else { // popup querying feeds sendResponse(tabsFeeds.get(request)); } }); browser.tabs.onUpdated.addListener((tabId, changeInfo, tab) => { if (typeof changeInfo.url === 'undefined') { // filter out updates which do not change the URL return; } // hide the page action when the URL changes since it is no longer valid, // it will be shown again if the content script detects a feed browser.pageAction.hide(tabId); // inject content script once if the requested URL is a feed preview if (tabsFeedPreviews.get(tabId) === changeInfo.url) { browser.tabs.executeScript(tabId, { file: 'content_scripts/feed-readers.js' }); tabsFeedPreviews.delete(tabId); } }); browser.tabs.onRemoved.addListener((tabId, removeInfo) => { tabsFeeds.delete(tabId); tabsFeedPreviews.delete(tabId); }); browser.runtime.onInstalled.addListener(async details => { if (details.reason === 'install' || (details.reason === 'update' && details.previousVersion < 2)) { let {feedReaders = []} = await browser.storage.sync.get('feedReaders'); let feedReadersSet = new Set(feedReaders.map(feedReader => feedReader.urlTemplate)); for (let feedReader of FEED_READERS_PRESET) { if (!feedReadersSet.has(feedReader.urlTemplate)) { feedReaders.push(feedReader); } } console.log('set feedReaders to', feedReaders); browser.storage.sync.set({feedReaders}); } });