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Hook revokeObjectURL to protect injected worker blob (release) #57

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Merged
ryanbr merged 1 commit into from
Apr 7, 2026
+18 −2
Merged

Hook revokeObjectURL to protect injected worker blob (release) #57

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10 changes: 9 additions & 1 deletion vaft/vaft-ublock-origin.js
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Original file line number Diff line number Diff line change
Expand Up @@ -121,7 +121,14 @@ twitch-videoad.js text/javascript
return !hasConflict || hasReinsert;
}
// Replace window.Worker to intercept Twitch's video worker and inject ad-blocking logic
let injectedBlobUrl = null;
function hookWindowWorker() {
// Prevent Twitch from revoking our injected worker blob URL
const originalRevokeObjectURL = URL.revokeObjectURL;
URL.revokeObjectURL = function(url) {
if (url === injectedBlobUrl) return;
return originalRevokeObjectURL.call(this, url);
};
const reinsert = getWorkersForReinsert(window.Worker);
const newWorker = class Worker extends getCleanWorker(window.Worker) {
constructor(twitchBlobUrl, options) {
Expand Down Expand Up @@ -205,7 +212,8 @@ twitch-videoad.js text/javascript
hookWorkerFetch();
eval(workerString);
`;
super(URL.createObjectURL(new Blob([newBlobStr])), options);
injectedBlobUrl = URL.createObjectURL(new Blob([newBlobStr]));
super(injectedBlobUrl, options);
twitchWorkers.length = 0;
twitchWorkers.push(this);
this.addEventListener('message', (e) => {
Expand Down
10 changes: 9 additions & 1 deletion vaft/vaft.user.js
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Original file line number Diff line number Diff line change
Expand Up @@ -132,7 +132,14 @@
return !hasConflict || hasReinsert;
}
// Replace window.Worker to intercept Twitch's video worker and inject ad-blocking logic
let injectedBlobUrl = null;
function hookWindowWorker() {
// Prevent Twitch from revoking our injected worker blob URL
const originalRevokeObjectURL = URL.revokeObjectURL;
URL.revokeObjectURL = function(url) {
if (url === injectedBlobUrl) return;
return originalRevokeObjectURL.call(this, url);
};
const reinsert = getWorkersForReinsert(window.Worker);
const newWorker = class Worker extends getCleanWorker(window.Worker) {
constructor(twitchBlobUrl, options) {
Expand Down Expand Up @@ -216,7 +223,8 @@
hookWorkerFetch();
eval(workerString);
`;
super(URL.createObjectURL(new Blob([newBlobStr])), options);
injectedBlobUrl = URL.createObjectURL(new Blob([newBlobStr]));
super(injectedBlobUrl, options);
twitchWorkers.length = 0;
twitchWorkers.push(this);
this.addEventListener('message', (e) => {
Expand Down
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