refactor install.js
* run_at: document_start * MutationObserver to rebrand without flickering the original text * reuse styleSectionsEqual * don't proceed when orphaned
This commit is contained in:
tophf
parent
3961224f80
commit
e61a24b4e4
385
install.js
385
install.js
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@ -1,188 +1,245 @@
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/* eslint-disable no-tabs, indent, quotes, no-var */
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'use strict';
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chrome.runtime.sendMessage({method: "getStyles", url: getMeta("stylish-id-url") || location.href}, function(response) {
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if (response.length == 0) {
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sendEvent("styleCanBeInstalledChrome");
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} else {
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var installedStyle = response[0];
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// maybe an update is needed
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// use the md5 if available
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var md5Url = getMeta("stylish-md5-url");
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if (md5Url && installedStyle.md5Url && installedStyle.originalMd5) {
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getResource(md5Url, function(md5) {
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if (md5 == installedStyle.originalMd5) {
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sendEvent("styleAlreadyInstalledChrome", {updateUrl: installedStyle.updateUrl});
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} else {
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sendEvent("styleCanBeUpdatedChrome", {updateUrl: installedStyle.updateUrl});
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}
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});
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} else {
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getResource(getMeta("stylish-code-chrome"), function(code) {
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// this would indicate a failure (a style with settings?).
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if (code === null) {
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sendEvent("styleCanBeUpdatedChrome", {updateUrl: installedStyle.updateUrl});
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}
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var json = JSON.parse(code);
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if (json.sections.length == installedStyle.sections.length) {
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if (json.sections.every(function(section) {
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return installedStyle.sections.some(function(installedSection) {
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return sectionsAreEqual(section, installedSection);
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});
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})) {
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// everything's the same
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sendEvent("styleAlreadyInstalledChrome", {updateUrl: installedStyle.updateUrl});
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return;
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}
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}
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sendEvent("styleCanBeUpdatedChrome", {updateUrl: installedStyle.updateUrl});
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});
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}
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}
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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 sectionsAreEqual(a, b) {
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if (a.code != b.code) {
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return false;
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}
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return ["urls", "urlPrefixes", "domains", "regexps"].every(function(attribute) {
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return arraysAreEqual(a[attribute], b[attribute]);
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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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const rebrandObserver = new MutationObserver(rebrand);
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rebrandObserver.observe(document.body, {childList: true, subtree: true});
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document.addEventListener('DOMContentLoaded', function _() {
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document.removeEventListener('DOMContentLoaded', _);
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rebrandObserver.disconnect();
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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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}
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function arraysAreEqual(a, b) {
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// treat empty array and undefined as equivalent
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if (typeof a == "undefined") {
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return (typeof b == "undefined") || (b.length == 0);
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}
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if (typeof b == "undefined") {
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return (typeof a == "undefined") || (a.length == 0);
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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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return a.every(function(entry) {
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return b.indexOf(entry) != -1;
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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, data) {
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if (typeof data == "undefined") {
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data = null;
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}
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var stylishEvent = new CustomEvent(type, {detail: data});
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document.dispatchEvent(stylishEvent);
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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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document.dispatchEvent(new CustomEvent(type, detail));
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}
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document.addEventListener("stylishUpdateChrome", stylishUpdateChrome);
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function stylishInstallChrome() {
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orphanCheck();
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getResource(getMeta("stylish-description"), function(name) {
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if (confirm(chrome.i18n.getMessage('styleInstall', [name]))) {
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getResource(getMeta("stylish-code-chrome"), function(code) {
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// check for old style json
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var json = JSON.parse(code);
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json.method = "saveStyle";
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chrome.runtime.sendMessage(json, function() {
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sendEvent("styleInstalledChrome");
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});
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});
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getResource(getMeta("stylish-install-ping-url-chrome"));
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}
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});
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function onInstallClicked() {
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if (!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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document.addEventListener("stylishInstallChrome", stylishInstallChrome);
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function stylishUpdateChrome() {
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orphanCheck();
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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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}, function(response) {
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var style = response[0];
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if (confirm(chrome.i18n.getMessage('styleUpdate', [style.name]))) {
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getResource(getMeta("stylish-code-chrome"), function(code) {
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var json = JSON.parse(code);
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json.method = "saveStyle";
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json.id = style.id;
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chrome.runtime.sendMessage(json, function() {
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sendEvent("styleInstalledChrome");
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});
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});
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}
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});
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function onUpdateClicked() {
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if (!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, {method: 'saveStyle'}),
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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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var e = document.querySelector("link[rel='" + name + "']");
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return e ? e.getAttribute("href") : null;
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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, callback) {
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if (url.indexOf("#") == 0) {
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if (callback) {
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callback(document.getElementById(url.substring(1)).innerText);
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}
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return;
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}
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var xhr = new XMLHttpRequest();
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xhr.onreadystatechange = function() {
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if (xhr.readyState == 4 && callback) {
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if (xhr.status >= 400) {
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callback(null);
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} else {
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callback(xhr.responseText);
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}
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}
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};
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if (url.length > 2000) {
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var parts = url.split("?");
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xhr.open("POST", parts[0], true);
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xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
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xhr.send(parts[1]);
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} else {
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xhr.open("GET", url, true);
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xhr.send();
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}
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function getResource(url) {
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if (url.startsWith('#')) {
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return Promise.resolve(document.getElementById(url.slice(1)).textContent);
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}
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return new Promise(resolve => {
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const xhr = new XMLHttpRequest();
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xhr.onloadend = () => resolve(xhr.status < 400 ? xhr.responseText : null);
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if (url.length > 2000) {
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const [mainUrl, query] = url.split('?');
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xhr.open('POST', mainUrl, true);
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xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
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xhr.send(query);
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} else {
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xhr.open('GET', url);
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xhr.send();
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}
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});
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}
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/* stylish to stylus; https://github.com/schomery/stylish-chrome/issues/12 */
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(function(es) {
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es.forEach(e => {
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[...e.childNodes].filter(n => n.nodeType == 3).forEach(n => {
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n.nodeValue = n.nodeValue.replace('Stylish', 'Stylus');
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});
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});
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})([
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...document.querySelectorAll('div[id^="stylish-installed-style-not-installed-"]'),
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...document.querySelectorAll('div[id^="stylish-installed-style-needs-update-"]')
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]);
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// orphaned content script check
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function rebrand(mutations) {
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/* stylish to stylus; https://github.com/schomery/stylish-chrome/issues/12 */
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for (const mutation of mutations) {
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for (const addedNode of mutation.addedNodes) {
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if (addedNode.nodeType != Node.ELEMENT_NODE) {
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continue;
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}
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const elementsToCheck = addedNode.matches('.install-status') ? [addedNode]
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: Array.prototype.slice.call(addedNode.getElementsByClassName('install-status'));
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for (const el of elementsToCheck) {
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if (!el.textContent.includes('Stylish')) {
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continue;
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}
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const walker = document.createTreeWalker(el, 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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if (text.includes('Stylish') && node.parentNode.localName != 'a') {
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node.nodeValue = text.replace(/Stylish/g, 'Stylus');
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}
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}
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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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chrome.runtime.onMessage.addListener((msg, sender, sendResponse) =>
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msg.method == 'ping' && sendResponse(true));
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function orphanCheck() {
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var port = chrome.runtime.connect();
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if (port) {
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port.disconnect();
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return;
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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', stylishUpdateChrome);
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document.removeEventListener('stylishInstallChrome', stylishInstallChrome);
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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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'arraysAreEqual',
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'getMeta',
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'getResource',
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'orphanCheck',
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'sectionsAreEqual',
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'sendEvent',
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'stylishUpdateChrome',
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'stylishInstallChrome'
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].forEach(fn => (window[fn] = null));
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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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@ -39,7 +39,7 @@
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},
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{
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"matches": ["http://userstyles.org/*", "https://userstyles.org/*"],
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"run_at": "document_end",
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"run_at": "document_start",
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"all_frames": false,
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"js": ["install.js"]
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}
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