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Fix: Robust Event Hijacking for Background Play (prevents site breakage) #807

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Fix: Robust Event Hijacking for Background Play (prevents site breakage) #807

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56 changes: 51 additions & 5 deletions src/contentScript/main/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -199,14 +199,16 @@ class GhostMode {

class BackgroundHide {
active = false
wrappers = new Map<any, any>()

constructor() {
const self = this;

try {
// Override document.hidden
["hidden", "mozHidden", "webkitHidden"].forEach(key => {
const og = Object.getOwnPropertyDescriptor(Document.prototype, key)
if (!og) return
if (!og) return
Object.defineProperty(Document.prototype, key, {
...og,
get: function () {
Expand All @@ -215,11 +217,11 @@ class BackgroundHide {
}
})
});

// Override document.visibilityState
["visibilityState", "mozVisibilityState", "webkitVisibilityState"].forEach(key => {
const og = Object.getOwnPropertyDescriptor(Document.prototype, key)
if (!og) return
if (!og) return
Object.defineProperty(Document.prototype, key, {
...og,
get: function () {
Expand All @@ -228,13 +230,57 @@ class BackgroundHide {
}
})
})
} catch {}

// Hijack addEventListener/removeEventListener to block visibilitychange
const hijackTarget = Document.prototype
const ogAdd = hijackTarget.addEventListener
const ogRemove = hijackTarget.removeEventListener

hijackTarget.addEventListener = function (type: string, listener: any, options?: any) {
if (type === 'visibilitychange' && listener) {
const wrapper = function (e: Event) {
if (self.active) {
e.stopImmediatePropagation()
e.stopPropagation()
return
}
if (typeof listener === 'function') {
listener.call(this, e)
} else if (listener && typeof listener.handleEvent === 'function') {
listener.handleEvent(e)
}
}
self.wrappers.set(listener, wrapper)
return ogAdd.call(this, type, wrapper, options)
}
return ogAdd.call(this, type, listener, options)
}

hijackTarget.removeEventListener = function (type: string, listener: any, options?: any) {
if (type === 'visibilitychange' && listener) {
const wrapper = self.wrappers.get(listener)
if (wrapper) {
self.wrappers.delete(listener)
return ogRemove.call(this, type, wrapper, options)
}
}
return ogRemove.call(this, type, listener, options)
}

} catch (err) { }
}
activate() {
this.active = true
// Dispatch a fake visibility event to force sites to re-check the now-spoofed state
try {
document.dispatchEvent(new Event("visibilitychange"))
} catch (e) { }
}
deactivate() {
this.active = false
try {
document.dispatchEvent(new Event("visibilitychange"))
} catch (e) { }
}
}

Expand Down Expand Up @@ -270,7 +316,7 @@ class StratumClient {
data.off ? backgroundHide.deactivate() : backgroundHide.activate()
} else if (data.type === "YT_RATE_CHANGE") {
data.value && handleYtRateChange?.(data.value)
}
}
}
send = (data: any) => {
native.dispatchEvent.call(this.#parasiteRoot, new native.CustomEvent(this.#serverName, { detail: native.JSON.stringify({ type: "MSG", data }) }))
Expand Down