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Block reddit click tracking

Stops reddit from tracking your inbound and outbound clicks

当前为 2018-03-12 提交的版本，查看 最新版本。

// ==UserScript==
// @name        Block reddit click tracking
// @namespace   mjhcfwlmjfzg778evppa995xavvt2nmb
// @description Stops reddit from tracking your inbound and outbound clicks
// @match       *://*.reddit.com/*
// @version     1.0
// @grant       none
// @run-at      document-start
// ==/UserScript==

(function () {
	"use strict";

	var expiredDate = Date.now().toString();


	// Capturing event listener on the outermost element.
	// Runs FIRST, before any others.
	function beforeClick(e) {
		var target = e.target;

		if (target.tagName.toUpperCase() === "A" && target.dataset.hrefUrl) {
			// Remove link tracking attributes
			delete target.dataset.inboundUrl;
			delete target.dataset.outboundUrl;

			// Mark outbound link as expired so reddit code
			// does not try to use it
			if (target.dataset.outboundExpiration) {
				target.dataset.outboundExpiration = expiredDate;
			}
		}
	}


	// Bubbling event listener on the outermost element.
	// Runs LAST, just before the click goes through
	// (unless reddit code adds any others afterwards)
	function justBeforeClick(e) {
		var target = e.target;

		// If reddit event handlers modified the link, change it back
		if (target.tagName.toUpperCase() === "A" && target.dataset.hrefUrl) {
			target.href = target.dataset.hrefUrl;
		}
	}


	// Mark both event listeners as passive so they
	// won't impact scroll performance
	var doCapture = { capture: true,  passive: true };
	var doBubble  = { capture: false, passive: true };

	window.addEventListener("mousedown",  beforeClick, doCapture);
	window.addEventListener("keydown",    beforeClick, doCapture);
	window.addEventListener("touchstart", beforeClick, doCapture);

	window.addEventListener("mousedown",  justBeforeClick, doBubble);
	window.addEventListener("keydown",    justBeforeClick, doBubble);
	window.addEventListener("touchstart", justBeforeClick, doBubble);


	// Patch navigator.sendBeacon() if it is available
	if (typeof Navigator.prototype.sendBeacon === "function") {
		// Fake sendBeacon() function that does nothing
		Navigator.prototype.sendBeacon = function sendBeacon(url) {
			return true;
		};
	}
})();