我们如何覆盖navigator.getBattery()? [英] How can we overwrite navigator.getBattery()?
问题描述
我们正在编写一个chrome扩展程序,当运行指纹的站点通过运行客户端代码的站点检查电池电量时,它将返回一个随机的电池电量.一个网站可以使用的示例代码如下所示.
We are writing a chrome extension that returns a random battery level when the battery level is checked by a site running client-side code for fingerprinting reasons. Sample code that can be used by a site can be seen below.
navigator.getBattery().then(function(battery) {
console.log(battery.level);
});
我们找不到有关如何覆盖 navigator.getBattery()
方法以实现目标的文档.可以在下面看到不完整的content-script.js.
We are unable to find documentation regarding how the navigator.getBattery()
method can be overwritten to accomplish the goal. The incomplete content-script.js can be seen below.
var navigatorBatteryPrivacy = '(' + function() {
'use strict';
var navigator = window.navigator;
var modifiedNavigator;
if (Navigator.prototype) {
modifiedNavigator = Navigator.prototype;
} else {
modifiedNavigator = Object.create(navigator);
Object.defineProperty(window, 'navigator', {
value: modifiedNavigator,
configurable: false,
enumerable: false,
writable: false
});
}
modifiedNavigator.getBattery = function modifiedGetBattery() {
return Promise.resolve(new BatteryManager());
};
} + ')();';
var s = document.createElement('script');
s.textContent = navigatorBatteryPrivacy;
document.documentElement.appendChild(s);
s.remove();
我们感谢社区成员的合作.
We appreciate the cooperation of the community members.
推荐答案
使用内容脚本,该脚本通过以下代码在document_start处注入脚本-
Use a content script that injects a script at document_start with the following code -
Object.defineProperty(navigator, "getBattery", {
value: () => {/*your custom logic goes here*/}
});
将以下内容添加到清单json中.
Add the following to manifest json.
"content_scripts": [{
"run_at": "document_start",
"js": ["contentscript.js"]
}]
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