webext-active-tab/distribution/scripts.js

WebExtension module: Track `activeTab` permission; automatically inject content scripts

import { injectContentScript } from 'webext-content-scripts';
import { addActiveTabListener, possiblyActiveTabs } from './tracker.js';
import { isContentScriptRegistered } from './utils.js';
const gotNavigation = typeof chrome === 'object' && 'webNavigation' in chrome;
const scripts = chrome.runtime.getManifest().content_scripts;
async function injectToTabUnlessRegistered({ id: tabId, origin }) {
    if (tabId === undefined) {
        return;
    }
    const frames = gotNavigation
        // Only with `webNavigation` we can inject into the frames
        ? await chrome.webNavigation.getAllFrames({ tabId })
        // Without it, we only inject it into the top frame
        : [{ frameId: 0, url: origin }];
    // .map() needed for async loop
    void frames?.map(async ({ frameId, url }) => injectIfActive({ frameId, url, tabId }));
}
async function injectIfActive({ tabId, frameId, url }) {
    const { origin } = new URL(url);
    if (
    // Check origin because the request might be for a frame; cross-origin frames do not receive activeTab
    possiblyActiveTabs.get(tabId) === origin
        // Don't inject if already registered
        && !(await isContentScriptRegistered(url))) {
        console.debug('activeTab: will inject', { tabId, frameId, url });
        await injectContentScript({ tabId, frameId }, scripts);
    }
    else {
        console.debug('activeTab: won’t inject', { tabId, frameId, url }, { activeTab: possiblyActiveTabs.get(tabId) ?? 'no' });
    }
}
async function tabListener(tabId, { status }, { url }) {
    // Only status updates are relevant
    // No URL = no permission
    if (status === 'loading' && url) {
        await injectIfActive({ tabId, url, frameId: 0 });
    }
}
export default function register() {
    addActiveTabListener(injectToTabUnlessRegistered);
    if (gotNavigation) {
        chrome.webNavigation.onCommitted.addListener(injectIfActive);
    }
    else {
        chrome.tabs.onUpdated.addListener(tabListener);
    }
}