ccb2e899b3
* use wrappedJSObject to create style elements in page context * skip unnecessary polyfills in content scripts * group all style management stuff in injector * support all API methods in content scripts
185 lines
5.0 KiB
JavaScript
185 lines
5.0 KiB
JavaScript
/* global msg API prefs createStyleInjector */
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'use strict';
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// Chrome reruns content script when documentElement is replaced.
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// Note, we're checking against a literal `1`, not just `if (truthy)`,
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// because <html id="INJECTED"> is exposed per HTML spec as a global variable and `window.INJECTED`.
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// eslint-disable-next-line no-unused-expressions
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self.INJECTED !== 1 && (() => {
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self.INJECTED = 1;
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const STYLE_VIA_API = !chrome.app && document instanceof XMLDocument;
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const styleInjector = createStyleInjector({
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compare: (a, b) => a.id - b.id,
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onUpdate: onInjectorUpdate,
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});
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const initializing = init();
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// save it now because chrome.runtime will be unavailable in the orphaned script
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const orphanEventId = chrome.runtime.id;
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let isOrphaned;
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// firefox doesn't orphanize content scripts so the old elements stay
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if (!chrome.app) styleInjector.clearOrphans();
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msg.onTab(applyOnMessage);
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if (!chrome.tabs) {
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window.dispatchEvent(new CustomEvent(orphanEventId));
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window.addEventListener(orphanEventId, orphanCheck, true);
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}
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let parentDomain;
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prefs.subscribe(['disableAll'], (key, value) => doDisableAll(value));
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if (window !== parent) {
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prefs.subscribe(['exposeIframes'], updateExposeIframes);
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}
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function onInjectorUpdate() {
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if (!isOrphaned) {
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updateCount();
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updateExposeIframes();
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}
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}
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function init() {
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return STYLE_VIA_API ?
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API.styleViaAPI({method: 'styleApply'}) :
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API.getSectionsByUrl(getMatchUrl()).then(styleInjector.apply);
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}
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function getMatchUrl() {
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let matchUrl = location.href;
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if (!matchUrl.match(/^(http|file|chrome|ftp)/)) {
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// dynamic about: and javascript: iframes don't have an URL yet
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// so we'll try the parent frame which is guaranteed to have a real URL
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try {
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if (window !== parent) {
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matchUrl = parent.location.href;
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}
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} catch (e) {}
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}
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return matchUrl;
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}
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function applyOnMessage(request) {
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if (STYLE_VIA_API) {
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if (request.method === 'urlChanged') {
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request.method = 'styleReplaceAll';
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}
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if (/^(style|updateCount)/.test(request.method)) {
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API.styleViaAPI(request);
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return;
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}
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}
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switch (request.method) {
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case 'ping':
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return true;
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case 'styleDeleted':
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styleInjector.remove(request.style.id);
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break;
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case 'styleUpdated':
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if (request.style.enabled) {
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API.getSectionsByUrl(getMatchUrl(), request.style.id)
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.then(sections => {
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if (!sections[request.style.id]) {
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styleInjector.remove(request.style.id);
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} else {
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styleInjector.apply(sections);
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}
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});
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} else {
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styleInjector.remove(request.style.id);
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}
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break;
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case 'styleAdded':
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if (request.style.enabled) {
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API.getSectionsByUrl(getMatchUrl(), request.style.id)
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.then(styleInjector.apply);
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}
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break;
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case 'urlChanged':
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API.getSectionsByUrl(getMatchUrl())
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.then(styleInjector.replace);
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break;
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case 'backgroundReady':
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initializing
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.catch(err => {
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if (msg.RX_NO_RECEIVER.test(err.message)) {
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return init();
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}
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})
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.catch(console.error);
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break;
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case 'updateCount':
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updateCount();
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break;
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}
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}
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function doDisableAll(disableAll) {
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if (STYLE_VIA_API) {
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API.styleViaAPI({method: 'prefChanged', prefs: {disableAll}});
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} else {
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styleInjector.toggle(!disableAll);
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}
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}
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function fetchParentDomain() {
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return parentDomain ?
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Promise.resolve() :
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API.getTabUrlPrefix()
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.then(newDomain => {
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parentDomain = newDomain;
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});
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}
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function updateExposeIframes() {
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if (!prefs.get('exposeIframes') || window === parent || !styleInjector.list.length) {
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document.documentElement.removeAttribute('stylus-iframe');
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} else {
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fetchParentDomain().then(() => {
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document.documentElement.setAttribute('stylus-iframe', parentDomain);
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});
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}
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}
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function updateCount() {
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if (window !== parent) {
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// we don't care about iframes
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return;
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}
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if (/^\w+?-extension:\/\/.+(popup|options)\.html$/.test(location.href)) {
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// popup and the option page are not tabs
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return;
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}
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if (STYLE_VIA_API) {
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API.styleViaAPI({method: 'updateCount'}).catch(msg.ignoreError);
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} else {
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API.updateIconBadge(styleInjector.list.length).catch(console.error);
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}
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}
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function orphanCheck() {
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try {
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if (chrome.i18n.getUILanguage()) return;
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} catch (e) {}
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// In Chrome content script is orphaned on an extension update/reload
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// so we need to detach event listeners
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window.removeEventListener(orphanEventId, orphanCheck, true);
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isOrphaned = true;
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styleInjector.clear();
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try {
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msg.off(applyOnMessage);
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} catch (e) {}
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}
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})();
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