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fix(adblocker): inject scriplets with browser.contentScripts on Firefox #2074

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fix(adblocker): inject scriplets with browser.contentScripts on Firefox #2074

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a3c651f
POC: on Firefox inject scriplets with browser.contentScripts
chrmod Nov 19, 2024
df1d53b
Cleanup
chrmod Nov 19, 2024
fee3f0f
Update src/background/adblocker.js
chrmod Nov 19, 2024
05fd0a5
Cleanup
chrmod Nov 19, 2024
d589cb3
rename content script api
chrmod Nov 19, 2024
06defed
Reduce diff
chrmod Nov 19, 2024
4ad49a1
fix error handling
chrmod Nov 19, 2024
b63b226
Skip matching when not needed
chrmod Nov 20, 2024
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104 changes: 83 additions & 21 deletions src/background/adblocker.js
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,7 @@ export async function reloadMainEngine() {
await engines.create(engines.MAIN_ENGINE);
console.info('[adblocker] Main engine reloaded with no filters');
}
contentScripts.clear();
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}

let updating = false;
Expand Down Expand Up @@ -167,7 +168,29 @@ export const setup = asyncSetup([
* Cosmetics injection
*/

async function injectScriptlets(scripts, tabId, frameId) {
const contentScripts = (() => {
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const map = new Map();
return {
set(key, value) {
map.set(key, value);
},
has(key) {
return map.has(key);
},
delete(key) {
const contentScript = map.get(key);
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contentScript.unregister();
map.delete(key);
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},
clear() {
for (const key of map.keys()) {
this.delete(key);
}
},
};
})();

async function injectScriptlets(scripts, tabId, frameId, hostname) {
// Dynamically injected scriptlets can be difficult to find later in
// the debugger. Console logs simplifies setting up breakpoints if needed.
if (debugMode) {
Expand Down Expand Up @@ -196,25 +219,52 @@ async function injectScriptlets(scripts, tabId, frameId) {
script.remove();
}

chrome.scripting.executeScript(
{
injectImmediately: true,
world:
chrome.scripting.ExecutionWorld?.MAIN ??
(__PLATFORM__ === 'firefox' ? undefined : 'MAIN'),
target: {
tabId,
frameIds: [frameId],
},
func: scriptletInjector,
args: [encodeURIComponent(scriptlets)],
},
() => {
if (chrome.runtime.lastError) {
console.warn(chrome.runtime.lastError);
if (__PLATFORM__ === 'firefox') {
if (scripts.length === 0) {
contentScripts.delete(hostname);
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} else if (!contentScripts.has(hostname)) {
try {
const contentScript = await browser.contentScripts.register({
js: [
{
code: `(${scriptletInjector.toString()})("${encodeURIComponent(scriptlets)}")`,
},
],
allFrames: true,
matches: [`https://*.${hostname}/*`, `http://*.${hostname}/*`],
matchAboutBlank: true,
matchOriginAsFallback: true,
runAt: 'document_start',
});
contentScripts.set(hostname, contentScript);
} catch (e) {
console.warn(e);
contentScripts.delete(hostname);
}
},
);
}
} else {
if (scripts.length === 0) return;

chrome.scripting.executeScript(
{
injectImmediately: true,
world:
chrome.scripting.ExecutionWorld?.MAIN ??
(__PLATFORM__ === 'firefox' ? undefined : 'MAIN'),
target: {
tabId,
frameIds: [frameId],
},
func: scriptletInjector,
args: [encodeURIComponent(scriptlets)],
},
() => {
if (chrome.runtime.lastError) {
console.warn(chrome.runtime.lastError);
}
},
);
}
}

function injectStyles(styles, tabId, frameId) {
Expand Down Expand Up @@ -258,6 +308,7 @@ async function injectCosmetics(details, config) {

const engine = engines.get(engines.MAIN_ENGINE);
const isBootstrap = config.bootstrap;
const scriptletsOnly = Boolean(config.scriptletsOnly);

{
const cosmetics = engine.getCosmeticsFilters({
Expand All @@ -279,8 +330,12 @@ async function injectCosmetics(details, config) {
getRulesFromDOM: !isBootstrap,
});

if (isBootstrap && cosmetics.scripts.length > 0) {
injectScriptlets(cosmetics.scripts, tabId, frameId);
if (isBootstrap) {
injectScriptlets(cosmetics.scripts, tabId, frameId, hostname);
}

if (scriptletsOnly) {
return;
}

if (cosmetics.styles) {
Expand Down Expand Up @@ -365,6 +420,13 @@ function isTrusted(request, type) {
}

if (__PLATFORM__ === 'firefox') {
chrome.webNavigation.onBeforeNavigate.addListener(
(details) => {
injectCosmetics(details, { bootstrap: true, scriptletsOnly: true });
},
{ url: [{ urlPrefix: 'http://' }, { urlPrefix: 'https://' }] },
);

function isExtensionRequest(details) {
return (
(details.tabId === -1 && details.url.startsWith('moz-extension://')) ||
Expand Down