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feat: Overriding WebWorker Navigator #506

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feat: Overriding WebWorker Navigator #506

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4 changes: 4 additions & 0 deletions packages/fingerprint-injector/src/fingerprint-injector.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ import {
Fingerprint,
FingerprintGenerator,
FingerprintGeneratorOptions,
NavigatorFingerprint,
type UserAgentData,
} from 'fingerprint-generator';
import {
Expand Down Expand Up @@ -42,6 +43,7 @@ declare function overrideIntlAPI(language: string): void;
declare function overrideStatic(): void;
declare function runHeadlessFixes(): void;
declare function blockWebRTC(): void;
declare function overrideWebWorker(navigatorFingerprint: NavigatorFingerprint): void;

/**
* Fingerprint injector class.
Expand Down Expand Up @@ -251,6 +253,8 @@ export class FingerprintInjector {
clientWidth,
};

// @ts-expect-error internal browser code
overrideWebWorker(fp.navigator);
runHeadlessFixes();

if (mockWebRTC) blockWebRTC();
Expand Down
42 changes: 42 additions & 0 deletions packages/fingerprint-injector/src/utils.js
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Original file line number Diff line number Diff line change
Expand Up @@ -798,3 +798,45 @@ function overrideStatic() {
console.error(e);
}
}

function overrideWebWorker(navigatorFingerprint) {
const worker = `
Object.defineProperties(navigator, {
userAgent: {
get: () => "${navigatorFingerprint.userAgent}"
},
deviceMemory: {
get: () => ${navigatorFingerprint.deviceMemory}
},
platform: {
get: () => "${navigatorFingerprint.platform}"
},
hardwareConcurrency: {
get: () => ${navigatorFingerprint.hardwareConcurrency}
},
languages: {
get: () => ${JSON.stringify(navigatorFingerprint.languages)}
},
appVersion: {
get: () => "${navigatorFingerprint.appVersion}"
}
});

if(navigator.userAgentData){
Object.defineProperty(navigator, 'userAgentData', {
get: function(){
return ${JSON.stringify(navigatorFingerprint.userAgentData)}
}
});
}
\n`;
// eslint-disable-next-line
const createObjectURL = URL.createObjectURL;
URL.createObjectURL = function (blob) {
if (blob.type === 'application/javascript') {
// eslint-disable-next-line
blob = new Blob([worker, blob], { type: blob.type });
}
return createObjectURL.call(this, blob);
};
Comment on lines +835 to +841
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@barjin barjin Jan 5, 2026

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Note that this will only work with Web Workers initialized with new Worker(URL.createObjectURL(new Blob(...))), which is quite specific and doesn't cover all the possible use cases (e.g. const myWorker = new Worker("worker.js");).

Also, this approach will edit URL.createObjectURL return value for all application/javascript blobs, not only the Web Worker-related ones.

}