249 lines
6.8 KiB
JavaScript
249 lines
6.8 KiB
JavaScript
'use strict';
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document.addEventListener('stylishUpdateChrome', onUpdateClicked);
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document.addEventListener('stylishInstallChrome', onInstallClicked);
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new MutationObserver(waitForBody)
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.observe(document.documentElement, {childList: true});
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chrome.runtime.onMessage.addListener((msg, sender, sendResponse) => {
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// orphaned content script check
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if (msg.method == 'ping') {
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sendResponse(true);
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}
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});
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function waitForBody() {
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if (!document.body) {
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return;
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}
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this.disconnect();
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rebrand([{addedNodes: [document.body]}]);
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new MutationObserver(rebrand)
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.observe(document.body, {childList: true, subtree: true});
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chrome.runtime.sendMessage({
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method: 'getStyles',
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url: getMeta('stylish-id-url') || location.href
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}, checkUpdatability);
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}
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function checkUpdatability([installedStyle]) {
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if (!installedStyle) {
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sendEvent('styleCanBeInstalledChrome');
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return;
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}
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const md5Url = getMeta('stylish-md5-url');
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if (md5Url && installedStyle.md5Url && installedStyle.originalMd5) {
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getResource(md5Url).then(md5 => {
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reportUpdatable(md5 != installedStyle.originalMd5);
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});
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} else {
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getResource(getMeta('stylish-code-chrome')).then(code => {
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reportUpdatable(code === null ||
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!styleSectionsEqual(JSON.parse(code), installedStyle));
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});
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}
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function reportUpdatable(isUpdatable) {
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sendEvent(
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isUpdatable
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? 'styleCanBeUpdatedChrome'
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: 'styleAlreadyInstalledChrome',
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{
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updateUrl: installedStyle.updateUrl
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}
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);
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}
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}
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function sendEvent(type, detail = null) {
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detail = {detail};
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if (typeof cloneInto != 'undefined') {
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// Firefox requires explicit cloning, however USO can't process our messages anyway
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// because USO tries to use a global "event" variable deprecated in Firefox
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detail = cloneInto(detail, document); // eslint-disable-line no-undef
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}
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onDOMready().then(() => {
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document.dispatchEvent(new CustomEvent(type, detail));
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});
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}
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function onInstallClicked() {
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if (!orphanCheck || !orphanCheck()) {
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return;
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}
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getResource(getMeta('stylish-description'))
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.then(name => saveStyleCode('styleInstall', name))
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.then(() => getResource(getMeta('stylish-install-ping-url-chrome')));
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}
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function onUpdateClicked() {
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if (!orphanCheck || !orphanCheck()) {
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return;
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}
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chrome.runtime.sendMessage({
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method: 'getStyles',
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url: getMeta('stylish-id-url') || location.href,
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}, ([style]) => {
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saveStyleCode('styleUpdate', style.name, {id: style.id});
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});
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}
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function saveStyleCode(message, name, addProps) {
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return new Promise(resolve => {
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if (!confirm(chrome.i18n.getMessage(message, [name]))) {
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return;
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}
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getResource(getMeta('stylish-code-chrome')).then(code => {
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chrome.runtime.sendMessage(
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Object.assign(JSON.parse(code), addProps, {
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method: 'saveStyle',
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reason: 'update',
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}),
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() => sendEvent('styleInstalledChrome')
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);
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resolve();
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});
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});
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}
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function getMeta(name) {
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const e = document.querySelector(`link[rel="${name}"]`);
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return e ? e.getAttribute('href') : null;
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}
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function getResource(url) {
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return new Promise(resolve => {
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if (url.startsWith('#')) {
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resolve(document.getElementById(url.slice(1)).textContent);
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} else {
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chrome.runtime.sendMessage({method: 'download', url}, resolve);
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}
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});
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}
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function rebrand(mutations, observer) {
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/* stylish to stylus; https://github.com/schomery/stylish-chrome/issues/12 */
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if (!document.getElementById('hidden-meta') && document.readyState == 'loading') {
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return;
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}
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observer.disconnect();
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const elements = document.getElementsByClassName('install-status');
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for (let i = elements.length; --i >= 0;) {
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const walker = document.createTreeWalker(elements[i], NodeFilter.SHOW_TEXT);
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while (walker.nextNode()) {
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const node = walker.currentNode;
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const text = node.nodeValue;
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const parent = node.parentNode;
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const extensionHelp = /stylish_chrome/.test(parent.href);
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if (text.includes('Stylish') && (parent.localName != 'a' || extensionHelp)) {
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node.nodeValue = text.replace(/Stylish/g, 'Stylus');
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}
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if (extensionHelp) {
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parent.href = 'http://add0n.com/stylus.html';
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}
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}
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}
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}
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function styleSectionsEqual({sections: a}, {sections: b}) {
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if (!a || !b) {
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return undefined;
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}
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if (a.length != b.length) {
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return false;
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}
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const checkedInB = [];
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return a.every(sectionA => b.some(sectionB => {
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if (!checkedInB.includes(sectionB) && propertiesEqual(sectionA, sectionB)) {
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checkedInB.push(sectionB);
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return true;
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}
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}));
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function propertiesEqual(secA, secB) {
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for (const name of ['urlPrefixes', 'urls', 'domains', 'regexps']) {
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if (!equalOrEmpty(secA[name], secB[name], 'every', arrayMirrors)) {
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return false;
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}
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}
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return equalOrEmpty(secA.code, secB.code, 'substr', (a, b) => a == b);
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}
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function equalOrEmpty(a, b, telltale, comparator) {
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const typeA = a && typeof a[telltale] == 'function';
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const typeB = b && typeof b[telltale] == 'function';
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return (
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(a === null || a === undefined || (typeA && !a.length)) &&
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(b === null || b === undefined || (typeB && !b.length))
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) || typeA && typeB && a.length == b.length && comparator(a, b);
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}
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function arrayMirrors(array1, array2) {
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for (const el of array1) {
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if (array2.indexOf(el) < 0) {
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return false;
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}
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}
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for (const el of array2) {
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if (array1.indexOf(el) < 0) {
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return false;
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}
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}
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return true;
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}
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}
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function onDOMready() {
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if (document.readyState != 'loading') {
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return Promise.resolve();
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}
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return new Promise(resolve => {
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document.addEventListener('DOMContentLoaded', function _() {
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document.removeEventListener('DOMContentLoaded', _);
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resolve();
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});
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});
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}
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function orphanCheck() {
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const port = chrome.runtime.connect();
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if (port) {
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port.disconnect();
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return true;
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}
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// we're orphaned due to an extension update
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// we can detach event listeners
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document.removeEventListener('stylishUpdateChrome', onUpdateClicked);
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document.removeEventListener('stylishInstallChrome', onInstallClicked);
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// we can't detach chrome.runtime.onMessage because it's no longer connected internally
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// we can destroy global functions in this context to free up memory
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[
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'checkUpdatability',
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'getMeta',
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'getResource',
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'onInstallClicked',
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'onUpdateClicked',
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'orphanCheck',
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'rebrand',
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'saveStyleCode',
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'sendEvent',
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'styleSectionsEqual',
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'waitForBody',
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].forEach(fn => (window[fn] = null));
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}
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