【JS逆向学习】补环境代理（Proxy）方法_js补环境代理

自动化吐环境

本文主要是实现一个自动化吐环境的方法，对 Proxy 和 Reflect 不太了解的朋友可以阅读文章Javascript之Proxy、Reflect，里面对 Proxy 和 Reflect 做了简单介绍

代理单个对象

window = new Proxy(window, {
    set(target, property, value, receiver) {
        console.log("设置属性set window", property, typeof value);
        return Reflect.set(...arguments);
    },
    get(target, property, receiver) {
        console.log("获取属性get window", property, typeof target[property]);
        return target[property]
    }
});
document = new Proxy(document, {
    set(target, property, value, receiver) {
        console.log("设置属性set document", property, typeof value);
        return Reflect.set(...arguments);
    },
    get(target, property, receiver) {
        console.log("获取属性get document", property, typeof target[property]);
        return target[property]
    }
});
navigator = new Proxy(navigator, {
    set(target, property, value, receiver) {
        console.log("设置属性set navigator", property, typeof value);
        return Reflect.set(...arguments);
    },
    get(target, property, receiver) {
        console.log("获取属性get navigator", property, typeof target[property]);
        return target[property]
    }
});
location = new Proxy(location, {
    set(target, property, value, receiver) {
        console.log("设置属性set location", property, typeof value);
        return Reflect.set(...arguments);
    },
    get(target, property, receiver) {
        console.log("获取属性get location", property, typeof target[property]);
        return target[property]
    }
});
history = new Proxy(history, {
    set(target, property, value, receiver) {
        console.log("设置属性set history", property, typeof value);
        return Reflect.set(...arguments);
    },
    get(target, property, receiver) {
        console.log("获取属性get history", property, typeof target[property]);
        return target[property]
    }
});
screen = new Proxy(screen, {
    set(target, property, value, receiver) {
        console.log("设置属性set screen", property, typeof value);
        return Reflect.set(...arguments);
    },
    get(target, property, receiver) {
        console.log("获取属性get screen", property, typeof target[property]);
        return target[property]
    }
});
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方法封装

function getEnvs(proxyObjs) {
    for (let i = 0; i < proxyObjs.length; i++) {
        const handler = `{
      get: function(target, property, receiver) {
        console.log("方法:", "get  ", "对象:", "${proxyObjs[i]}", "  属性:", property, "  属性类型：", typeof property, ", 属性值：", target[property], ", 属性值类型：", typeof target[property]);
        return target[property];
      },
      set: function(target, property, value, receiver) {
        console.log("方法:", "set  ", "对象:", "${proxyObjs[i]}", "  属性:", property, "  属性类型：", typeof property, ", 属性值：", value, ", 属性值类型：", typeof target[property]);
        return Reflect.set(...arguments);
      }
    }`;
        eval(`try {
            ${proxyObjs[i]};
            ${proxyObjs[i]} = new Proxy(${proxyObjs[i]}, ${handler});
        } catch (e) {
            ${proxyObjs[i]} = {};
            ${proxyObjs[i]} = new Proxy(${proxyObjs[i]}, ${handler});
        }`);
    }
}
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测试代码

window = global;
proxyObjs = ['window', 'document', 'location', 'navigator', 'history', 'screen']
getEnvs(proxyObjs);
console.log(window.test);
window.name = "Jim";
console.log(window.name);
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OUTPUT:

方法: get   对象: window   属性: test   属性类型： string , 属性值： undefined , 属性值类型： undefined
undefined
方法: set   对象: window   属性: name   属性类型： string , 属性值： Jim , 属性值类型： undefined
方法: get   对象: window   属性: name   属性类型： string , 属性值： Jim , 属性值类型： string
Jim
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