stylus/background/navigator-util.js

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1.7 KiB
JavaScript
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2018-10-07 13:20:39 +00:00
'use strict';
const navigatorUtil = (() => {
const handler = {
urlChange: null
};
let listeners;
const tabGet = promisify(chrome.tabs.get.bind(chrome.tabs));
return extendNative({onUrlChange});
function onUrlChange(fn) {
initUrlChange();
handler.urlChange.push(fn);
}
function initUrlChange() {
if (!handler.urlChange) {
return;
}
handler.urlChange = [];
chrome.webNavigation.onCommitted.addListener(data =>
fixNTPUrl(data)
.then(() => executeCallbacks(handler.urlChange, data, 'committed'));
chrome.webNavigation.onHistoryStateUpdated.addListener(data =>
fixNTPUrl(data)
.then(() => executeCallbacks(handler.urlChange, data, 'historyStateUpdated'));
chrome.webNavigation.onReferenceFragmentUpdated.addListener(data =>
fixNTPUrl(data)
.then(() => executeCallbacks(handler.urlChange, data, 'referenceFragmentUpdated'));
}
function fixNTPUrl(data) {
if (
!CHROME ||
!URLS.chromeProtectsNTP ||
!data.url.startsWith('https://www.google.') ||
!data.url.includes('/_/chrome/newtab?')
) {
return Promise.resolve();
}
return tabGet(data.tabId)
.then(tab => {
if (tab.url === 'chrome://newtab/') {
data.url = tab.url;
}
});
}
function executeCallbacks(callbacks, data, type) {
for (const cb of callbacks) {
cb(data, type);
}
}
function extendNative(target) {
return new Proxy(target, {
get: (target, prop) => {
if (target[prop]) {
return target[prop];
}
return chrome.webNavigation[prop].addListener.bind(chrome.webNavigation[prop]);
}
});
}
})();