108 lines
2.4 KiB
JavaScript
108 lines
2.4 KiB
JavaScript
'use strict';
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function runtimeSend(request) {
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return new Promise((resolve, reject) => {
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chrome.runtime.sendMessage(
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request,
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({status, result}) => (status === 'error' ? reject : resolve)(result)
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);
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});
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}
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function createSourceLoader() {
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let source;
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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 load() {
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return fetchText(location.href)
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.then(_source => {
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source = _source;
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return source;
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});
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}
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function watch(cb) {
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let timer;
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const DELAY = 1000;
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function start() {
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if (timer) {
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return;
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}
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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(location.href)
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.then(_source => {
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if (source !== _source) {
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source = _source;
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return cb(source);
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}
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})
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.catch(console.log)
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.then(() => {
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timer = setTimeout(check, DELAY);
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});
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}
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return {start, stop};
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}
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return {load, watch, source: () => source};
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}
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function initUsercssInstall() {
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const pendingSource = createSourceLoader().load();
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chrome.runtime.onConnect.addListener(port => {
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// FIXME: is this the correct way to reject a connection?
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// https://developer.chrome.com/extensions/messaging#connect
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console.assert(port.name === 'usercss-install');
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port.onMessage.addListener(msg => {
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switch (msg.method) {
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case 'getSourceCode':
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pendingSource.then(sourceCode =>
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port.postMessage({method: msg.method + 'Response', sourceCode})
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).catch(err =>
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port.postMessage({method: msg.method + 'Response', error: err.message || String(err)})
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);
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break;
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}
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});
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});
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return runtimeSend({
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method: 'openUsercssInstallPage',
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updateUrl: location.href
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}).catch(alert);
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}
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function isUsercss() {
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if (!/text\/(css|plain)/.test(document.contentType)) {
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return false;
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}
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if (!/==userstyle==/i.test(document.body.textContent)) {
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return false;
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}
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return true;
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}
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if (isUsercss()) {
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initUsercssInstall();
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}
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