Event Handler Proxy Detection - JS Proxy

[alpgul]

Description

This test scenario is a security control mechanism that detects proxy manipulation of event handlers. The aim is to distinguish real user interactions from artificial/bot interactions. EventTarget.prototype.addEventListener detects unauthorized modification of events.

Test Code

document.addEventListener('click', (event) => {
    try {
        const proxyEvent = new Proxy(event, {});
        Object.getOwnPropertyDescriptor(Event.prototype, "type").get.call(event);
        if (proxyEvent.isTrusted === false) {
            console.log("Potential bot/proxy attempt detected");
        }
    } catch (error) {
        // Error handling and anti-bot control mechanism
        if (error instanceof TypeError && error.message.includes("Illegal invocation")) {
            console.log("[E]Potential bot/proxy attempt detected");
            // Anti-bot action
        }
    }
});
document.dispatchEvent(new Event("click"));

[untitlese5566]

Note that the error message is different on Firefox: Uncaught TypeError: 'get type' called on an object that does not implement interface Event.