reddit: sabotage event tracker

Blocks the reddit event collector
目前为 2018-03-28 提交的版本。查看最新版本。
换行
// ==UserScript==
// @name         reddit: sabotage event tracker
// @namespace    mz1js5x0yt0zxq1kf22z1wdn6zq2ij2g
// @version      1.1
// @description  Blocks the reddit event collector
// @match        *://*.reddit.com/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

(function() {
	"use strict";

	var realSetRequestHeader = XMLHttpRequest.prototype.setRequestHeader;
	var realSend             = XMLHttpRequest.prototype.send;


	var sigHeaderDetected = Symbol();


	// Hook this function to see if the suspect header is being set
	XMLHttpRequest.prototype.setRequestHeader = function setRequestHeader(header, value) {
		var foundHeader = false;
		header = String(header).toLowerCase();

		if (header.startsWith("x-signature")) {
			foundHeader = true;
		} else if (window.r && r.config) {
			if ((r.config.signature_header    && String(r.config.signature_header).toLowerCase()    === header) ||
				(r.config.signature_header_v2 && String(r.config.signature_header_v2).toLowerCase() === header)
			) {
				foundHeader = true;
			}
		}

		// Tag this object so we can block the send() call later
		if (foundHeader) {
			Reflect.defineProperty(this, sigHeaderDetected, {
				enumerable: true,
				configurable: false,
				writable: false,
				value: true
			});
		}

		return realSetRequestHeader.apply(this, arguments);
	};


	// Only allow sending if we did not detect the signature header
	XMLHttpRequest.prototype.send = function send(body) {
		if (sigHeaderDetected in this) {
			// nope
			this.abort();
		} else {
			return realSend.apply(this, arguments);
		}
	};
})();
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