114 lines
3.0 KiB
JavaScript
114 lines
3.0 KiB
JavaScript
'use strict';
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(() => {
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// some weird bug in new Chrome: the content script gets injected multiple times
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if (typeof window.initUsercssInstall === 'function') return;
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if (!/text\/(css|plain)/.test(document.contentType) ||
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!/==userstyle==/i.test(document.body.textContent)) {
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return;
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}
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window.initUsercssInstall = () => {};
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orphanCheck();
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const DELAY = 500;
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const url = location.href;
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let sourceCode, port, timer;
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chrome.runtime.onConnect.addListener(onConnected);
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chrome.runtime.sendMessage({method: 'installUsercss', url}, r =>
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r && r.__ERROR__ && alert(r.__ERROR__));
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function onConnected(newPort) {
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port = newPort;
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port.onDisconnect.addListener(stop);
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port.onMessage.addListener(onMessage);
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}
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function onMessage(msg, port) {
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switch (msg.method) {
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case 'getSourceCode':
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fetchText(url)
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.then(text => {
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sourceCode = sourceCode || text;
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port.postMessage({
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method: msg.method + 'Response',
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sourceCode,
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});
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})
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.catch(err => port.postMessage({
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method: msg.method + 'Response',
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error: err.message || String(err),
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}));
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break;
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case 'liveReloadStart':
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start();
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break;
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case 'liveReloadStop':
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stop();
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break;
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case 'closeTab':
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if (history.length > 1) {
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history.back();
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} else {
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chrome.runtime.sendMessage({method: 'closeTab'});
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}
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break;
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}
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}
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function fetchText(url) {
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return new Promise((resolve, reject) => {
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// you can't use fetch in Chrome under 'file:' protocol
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const xhr = new XMLHttpRequest();
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xhr.open('GET', url);
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xhr.addEventListener('load', () => resolve(xhr.responseText));
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xhr.addEventListener('error', () => reject(xhr));
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xhr.send();
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});
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}
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function start() {
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timer = timer || setTimeout(check, DELAY);
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}
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function stop() {
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clearTimeout(timer);
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timer = null;
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}
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function check() {
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fetchText(url)
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.then(text => {
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if (sourceCode === text) return;
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sourceCode = text;
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port.postMessage({method: 'sourceCodeChanged', sourceCode});
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})
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.catch(error => {
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console.log(chrome.i18n.getMessage('liveReloadError', error));
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})
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.then(() => {
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timer = null;
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start();
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});
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}
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function orphanCheck() {
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const eventName = chrome.runtime.id + '-install-hook-usercss';
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const orphanCheckRequest = () => {
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if (chrome.i18n && chrome.i18n.getUILanguage()) return true;
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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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removeEventListener(eventName, orphanCheckRequest, true);
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try {
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chrome.runtime.onConnect.removeListener(onConnected);
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} catch (e) {}
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};
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dispatchEvent(new Event(eventName));
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addEventListener(eventName, orphanCheckRequest, true);
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}
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})();
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