☰

Pop-Up Blocker

Simple but effective popup window blocker. Also tries to deny unsolicited redirections.

  1. // ==UserScript==
  2. // @name        Pop-Up Blocker
  3. // @namespace   HTML
  4. // @description Simple but effective popup window blocker. Also tries to deny unsolicited redirections.
  5. // @include     *
  6. // @version     $Id$
  7. // @grant       none
  8. // @run-at      document-start
  9. // ==/UserScript==
  10.  
  11. (function () {
  12. 	var BLOCK_MODE = {'ALL': 0,  // Block all popups
  13. 										'CONFIRM': 2,  // Confirm each popup (not recommended, but useful for testing)
  14. 										'GRANT_PERIOD': 4,  // Block popups that are initiated after the mouse click grant period
  15. 										'ALLOW_SECURE': 8,  // Allow popups from secure (HTTPS) sites (default don't allow)
  16. 										'ALLOW_REDIRECTS': 16,  // Allow unsolicited redirects (default block)
  17. 										'CONFIRM_UNLOAD': 32}  // Confirm assumed unsolicited page unload (default don't confirm)
  18.  
  19. 	// Configuration
  20. 	var block_mode = BLOCK_MODE.ALL;
  21. 	var grant_period = 100;  // Milliseconds
  22. 	var debug = false;  // Enable debug logging
  23.  
  24. 	// DO NOT CHANGE BELOW THIS POINT
  25. 	var allowed_elements = {'a': true, 'button': {'type': 'submit'}, 'input': true, 'select': true, 'option': true};
  26. 	var ts = 0, wopen = window.open, showmodaldlg = window.showModalDialog;
  27. 	var lastInteractedElement;
  28. 	var marginTop = null;
  29. 	var notifications = 0;
  30. 	var notificationOffsetTop = 0;
  31.  
  32. 	function confirmed(msg, arguments) {
  33. 		return block_mode & BLOCK_MODE.CONFIRM ? confirmPopup(msg, arguments) : false;
  34. 	}
  35.  
  36. 	function grantperiod_exceeded() {
  37. 		return block_mode & BLOCK_MODE.GRANT_PERIOD ? Date.now() > ts + grant_period : true;
  38. 	}
  39.  
  40. 	function protocol_allowed() {
  41. 		return block_mode & BLOCK_MODE.ALLOW_SECURE ? location.protocol == 'https:' : false;
  42. 	}
  43.  
  44. 	function element_allowed(element) {
  45. 		var allowed = element.tagName && allowed_elements[element.tagName.toLowerCase()];
  46. 		if (allowed && typeof allowed == "object") {
  47. 			for (var property in allowed) if (element[property] != element[property]) return false;
  48. 		}
  49. 		return allowed;
  50. 	}
  51.  
  52. 	window.addEventListener('mousedown', function (event) {
  53. 		ts = Date.now();
  54. 		if (debug) console.info('Mouse button', event.button != null ? event.button : event.which, 'down on', event.target);
  55. 		setlastInteractedElement(event);
  56. 		//mediateEventPropagation(event);
  57. 	}, true);
  58.  
  59. 	window.addEventListener('click', function (event) {
  60. 		ts = Date.now();
  61. 		if (debug) console.info('Mouse button', event.button != null ? event.button : event.which, 'click on', event.target);
  62. 		setlastInteractedElement(event);
  63. 		//mediateEventPropagation(event);
  64. 	}, true);
  65.  
  66. 	window.addEventListener('change', function (event) {
  67. 		ts = Date.now();
  68. 		if (debug) console.info('Changed selection on', event.target);
  69. 		setlastInteractedElement(event);
  70. 		//mediateEventPropagation(event);
  71. 	}, true);
  72.  
  73. 	function setlastInteractedElement(event) {
  74. 		// Deal with tags nested in (e.g.) links
  75. 		var element = event.target;
  76. 		if (event instanceof MouseEvent && (event.button != null ? event.button != 0 : event.which != 1)) return;
  77. 		while (element.parentElement && !element_allowed(element)) {
  78. 			element = element.parentElement;
  79. 		}
  80. 		lastInteractedElement = element;
  81. 		if (debug) console.info('Last interacted element', element);
  82. 	}
  83.  
  84. 	function mediateEventPropagation(event) {
  85. 		// Stop event propagation if element has a 'href' attribute that does not point to the current document
  86. 		// (prevents click hijacking)
  87. 		if (!protocol_allowed() &&
  88. 			lastInteractedElement &&
  89. 			lastInteractedElement.href &&
  90. 			boildown(lastInteractedElement.href) != boildown(window.location.href) &&
  91. 			lastInteractedElement.href.indexOf('javascript:') !== 0) {
  92. 			event.stopPropagation();
  93. 			console.warn('Pop-Up Blocker stopped event propagation for', event);
  94. 		}
  95. 	}
  96.  
  97. 	function regExpEscape(s) {
  98. 		return String(s).replace(/([-()\[\]{}+?*.$\^|,:#<!\\])/g, '\\$1').
  99. 			replace(/\x08/g, '\\x08');
  100. 	};
  101.  
  102. 	var regExpProtHostPathQ = new RegExp('^((' + regExpEscape(location.protocol) + '//' + regExpEscape(location.host) + ')?' +
  103. 										    '(' + regExpEscape(location.pathname) + ')?)?');
  104.  
  105. 	function boildown(uri) {
  106. 		var uri_boileddown = uri.replace(regExpProtHostPathQ, '');  // Strip current protocol + host + path
  107. 		uri_boileddown = uri_boileddown.replace(/#.*$/, '');  // Strip any hash
  108. 		// Sort query vars
  109. 		var query = uri_boileddown.match(/\?[^?]+/);
  110. 		if (query)
  111. 			query = '?' + query[0].substr(1).split('&').sort().join('&');
  112. 		uri_boileddown = uri_boileddown.replace(/\?[^?]+/, query || '');
  113. 		return uri_boileddown;
  114. 	};
  115.  
  116. 	// Deny unsolicited redirection
  117. 	if (!(block_mode & BLOCK_MODE.ALLOW_REDIRECTS) && typeof window.location.watch == 'function') window.location.watch(
  118. 		'href',
  119. 		function (id, oldval, newval) {
  120. 			var href_boileddown, newval_boileddown = boildown(newval);
  121. 			console.info('location.' + id, '->', newval);
  122. 			if (lastInteractedElement && lastInteractedElement.tagName &&
  123. 				lastInteractedElement.tagName.toLowerCase() == 'a')
  124. 				href_boileddown = boildown(lastInteractedElement.href);
  125. 			var link_hijacked = href_boileddown != undefined && newval.indexOf('#') !== 0 && newval_boileddown != href_boileddown;
  126. 				
  127. 			if (debug) {
  128. 				console.info('Page secure?', location.protocol == 'https:');
  129. 				if (block_mode & BLOCK_MODE.ALLOW_SECURE) console.info('Allowed protocol?', protocol_allowed());
  130. 				console.info('Last interacted element?', lastInteractedElement);
  131. 				if (lastInteractedElement) {
  132. 					console.info('Last interacted element tag name?', lastInteractedElement.tagName);
  133. 					if (lastInteractedElement.tagName) {
  134. 						console.info('Allowed element?', !!element_allowed(lastInteractedElement));
  135. 						console.info('Last interacted element is link?', lastInteractedElement.tagName.toLowerCase() == 'a');
  136. 						if (lastInteractedElement.tagName.toLowerCase() == 'a') {
  137. 							console.info('New location (boiled down) =', newval_boileddown);
  138. 							console.info('Link HREF (boiled down) =', href_boileddown);
  139. 							console.info('New location is the same as link HREF?', newval_boileddown == href_boileddown);
  140. 							console.info('Link target is a new window?', lastInteractedElement.target == '_blank');
  141. 						}
  142. 					}
  143. 				}
  144. 				if (block_mode & BLOCK_MODE.GRANT_PERIOD) console.info('Grant period exceeded?', grantperiod_exceeded());
  145. 			}
  146. 			if ((!protocol_allowed() || grantperiod_exceeded()) &&
  147. 				(!lastInteractedElement ||
  148. 				 (!element_allowed(lastInteractedElement) ||
  149. 				  (/*lastInteractedElement.tagName.toLowerCase() == 'a' &&*/
  150. 				   (link_hijacked ||
  151. 				    lastInteractedElement.target == '_blank'))))) {
  152. 				notify('Denied redirection to', newval, null, 0, null, '_self');
  153. 				console.error('Pop-Up Blocker denied redirection to ' + newval);
  154. 				return '#' + location.hash.replace(/^#/, '');
  155. 			}
  156. 			return newval;
  157. 		}
  158. 	);
  159.  
  160. 	var onbeforeunload = window.onbeforeunload;
  161. 	if (block_mode & BLOCK_MODE.CONFIRM_UNLOAD) window.onbeforeunload = function (e) {
  162. 		if (debug) console.info('window.', e);
  163. 		if (!protocol_allowed()) {
  164. 			if (debug) {
  165. 				console.info('Page secure?', location.protocol == 'https:');
  166. 				if (block_mode & BLOCK_MODE.ALLOW_SECURE) console.info('Allowed protocol?', protocol_allowed());
  167. 					console.info('Last interacted element?', lastInteractedElement);
  168. 					if (lastInteractedElement) {
  169. 						console.info('Last interacted element tag name?', lastInteractedElement.tagName);
  170. 						if (lastInteractedElement.tagName) {
  171. 							console.info('Allowed element?', !!element_allowed(lastInteractedElement));
  172. 						}
  173. 					}
  174. 					if (block_mode & BLOCK_MODE.GRANT_PERIOD) console.info('Grant period exceeded?', grantperiod_exceeded());
  175. 			}
  176. 			console.warn('You are possibly involuntarily being redirected to another page.');
  177. 			(e || window.event).returnValue = 'You are possibly involuntarily being redirected to another page. Do you want to leave ' + location.href + ' or stay?';
  178. 			return (e || window.event).returnValue;
  179. 		}
  180. 		else if (typeof onbeforeunload === 'function')
  181. 			return onbeforeunload.apply(window, arguments);
  182. 	};
  183.  
  184. 	//var onkeydown = window.onkeydown;
  185. 	//window.onkeydown = function (e) {
  186. 		//lastInteractedElement = null;
  187. 		//if (typeof onkeydown === 'function')
  188. 			//return onkeydown.apply(window, arguments);
  189. 	//};
  190.  
  191. 	//var onmouseleave = document.body.onmouseleave;
  192. 	//document.body.onmouseleave = function (e) {
  193. 		//lastInteractedElement = null;
  194. 		//if (typeof onmouseleave === 'function')
  195. 			//return onmouseleave.apply(document.body, arguments);
  196. 	//};
  197.  
  198. 	function confirmPopup(msg, args) {
  199. 		return confirm(msg + ' (' + Array.prototype.slice.apply(arguments).join(', ') + ')');
  200. 	}
  201.  
  202. 	window.open = function () {
  203. 		var oargs = arguments;
  204. 		if (debug) {
  205. 			console.info('Page secure?', location.protocol == 'https:');
  206. 			if (block_mode & BLOCK_MODE.ALLOW_SECURE) console.info('Allowed protocol?', protocol_allowed());
  207. 			if (block_mode & BLOCK_MODE.GRANT_PERIOD) console.info('Grant period exceeded?', grantperiod_exceeded());
  208. 		}
  209. 		if (/*['_self', '_parent', '_top'].includes(arguments[1]) ||*/
  210. 			(confirmed('Allow popup?', arguments) &&
  211. 			 (protocol_allowed() || !grantperiod_exceeded()))) {
  212. 			console.info('Pop-Up Blocker allowed window.open', Array.prototype.slice.apply(arguments));
  213. 			return wopen.apply(window, arguments);
  214. 		}
  215. 		else {
  216. 			console.error('Pop-Up Blocker blocked window.open', Array.prototype.slice.apply(arguments));
  217. 			notify('Blocked popup window', arguments[0], arguments[1], 0, function() {
  218. 				console.info('Pop-Up Blocker user clicked window.open', Array.prototype.slice.apply(oargs));
  219. 				wopen.apply(window, oargs);
  220. 			});
  221. 		}
  222. 		return {}
  223. 	};
  224.  
  225. 	window.showModalDialog = function () {
  226. 		if (debug) {
  227. 			console.info('Page secure?', location.protocol == 'https:');
  228. 			if (block_mode & BLOCK_MODE.ALLOW_SECURE) console.info('Allowed protocol?', protocol_allowed());
  229. 			if (block_mode & BLOCK_MODE.GRANT_PERIOD) console.info('Grant period exceeded?', grantperiod_exceeded());
  230. 		}
  231. 		if (confirmed('Allow modal dialog?', arguments) &&
  232. 			(protocol_allowed() || !grantperiod_exceeded())) {
  233. 			console.info('Pop-Up Blocker allowed window.showModalDialog', Array.prototype.slice.apply(arguments));
  234. 			return showmodaldlg.apply(window, arguments);
  235. 		}
  236. 		else {
  237. 			console.error('Pop-Up Blocker blocked modal showModalDialog', Array.prototype.slice.apply(arguments));
  238. 			notify('Blocked modal dialog', arguments[0], null, 0, function() {
  239. 				console.info('Pop-Up Blocker user clicked window.showModalDialog', Array.prototype.slice.apply(oargs));
  240. 				showmodaldlg.apply(window, oargs);
  241. 			});
  242. 		}
  243. 		return {}
  244. 	};
  245.  
  246. 	function notify(text, uri, title, timeout, onclick, target) {
  247. 		var rootElement = document.body.parentElement,
  248. 				notification = document.createElement('div');
  249. 		notification.onclick = function () {
  250. 			return false;
  251. 		}
  252. 		if (marginTop === null) marginTop = parseFloat((rootElement.currentStyle || window.getComputedStyle(rootElement)).marginTop)
  253. 		resetStyles(notification);
  254. 		notification.style.cssText += 'background: InfoBackground !important';
  255. 		notification.style.cssText += 'border-bottom: 1px solid WindowFrame !important';
  256. 		notification.style.cssText += 'box-sizing: border-box !important';
  257. 		notification.style.cssText += 'font: small-caption !important';
  258. 		notification.style.cssText += 'padding: .15em .9em !important';
  259. 		notification.style.cssText += 'position: fixed !important';
  260. 		notification.style.cssText += 'left: 0 !important';
  261. 		notification.style.cssText += 'line-height: 2.3 !important';  // 31px
  262. 		notification.style.cssText += 'right: 0 !important';
  263. 		notification.style.cssText += 'top: -100% !important';
  264. 		notification.style.cssText += 'transition: top .25s !important';
  265. 		notification.style.cssText += 'width: 100% !important';
  266. 		notification.style.cssText += 'white-space: nowrap !important';
  267. 		notification.style.cssText += 'z-index: 2147483647 !important';
  268. 		var closeButton = document.createElement('span');
  269. 		resetStyles(closeButton);
  270. 		closeButton.style.cssText += 'cursor: pointer !important';
  271. 		closeButton.style.cssText += 'display: inline-block !important';
  272. 		closeButton.style.cssText += 'float: right !important';
  273. 		closeButton.style.cssText += 'font: inherit !important';
  274. 		closeButton.style.cssText += 'line-height: 2.1 !important';
  275. 		closeButton.style.cssText += 'margin-left: .75em !important';
  276. 		closeButton.appendChild(document.createTextNode('╳'));
  277. 		function closeNotification(event) {
  278. 			if (event) event.stopPropagation();
  279. 			//notificationOffsetTop -= notification.offsetHeight;
  280. 			if (!--notifications) rootElement.style.cssText += 'margin-top: ' + marginTop + ' !important';
  281. 			notification.style.cssText += 'top: -' + notification.offsetHeight + 'px !important';
  282. 			setTimeout(function () {
  283. 				document.body.removeChild(notification);
  284. 			}, 250);
  285. 			return false;
  286. 		}
  287. 		closeButton.onclick = closeNotification;
  288. 		notification.appendChild(closeButton);
  289. 		notification.appendChild(document.createTextNode('🚫 ' + text));
  290. 		var numLinks = target == '_self' ? 1 : 2;
  291. 		for (var i = 0; i < numLinks; i ++) {
  292. 			var popupLink = document.createElement(!i ? 'a' : 'button');
  293. 			resetStyles(popupLink);
  294. 			if (i) {
  295. 				popupLink.style.cssText += '-moz-appearance: button !important';
  296. 				popupLink.style.cssText += '-webkit-appearance: button !important';
  297. 				popupLink.style.cssText += 'appearance: button !important';
  298. 				popupLink.style.cssText += 'background: ButtonFace !important';
  299. 				popupLink.style.cssText += 'border: 1px solid ButtonShadow !important';
  300. 				popupLink.style.cssText += 'color: ButtonText !important';
  301. 				popupLink.style.cssText += 'font: small-caption !important';
  302. 				popupLink.style.cssText += 'padding: .15em .5em !important';
  303. 			}
  304. 			else {
  305. 				popupLink.style.cssText += 'color: #00e !important';
  306. 				popupLink.style.cssText += 'color: -moz-nativehyperlinktext !important';
  307. 				popupLink.style.cssText += 'display: inline-block !important';
  308. 				popupLink.style.cssText += 'font: inherit !important';
  309. 				popupLink.style.cssText += 'max-width: 50% !important';
  310. 				popupLink.style.cssText += 'overflow: hidden !important';
  311. 				popupLink.style.cssText += 'text-decoration: underline !important';
  312. 				popupLink.style.cssText += 'text-overflow: ellipsis !important';
  313. 				popupLink.style.cssText += 'vertical-align: bottom !important';
  314. 				popupLink.style.cssText += 'white-space: nowrap !important';
  315. 				popupLink.setAttribute('href', uri);
  316. 				popupLink.setAttribute('target', target || '_blank');
  317. 			}
  318. 			if (title) popupLink.setAttribute('title', title);
  319. 			var linkText = i ? 'Open in this frame' : uri;
  320. 			popupLink.appendChild(document.createTextNode(linkText));
  321. 			popupLink.onclick = function(event) {
  322. 				event.stopPropagation();
  323. 				closeNotification();
  324. 				if (this.tagName.toLowerCase() != 'a') {
  325. 					location.href = uri;
  326. 				}
  327. 				else if (onclick) {
  328. 					onclick(event);
  329. 					return false;
  330. 				}
  331. 			};
  332. 			notification.appendChild(document.createTextNode(' '));
  333. 			notification.appendChild(popupLink);
  334. 		}
  335. 		if (!notifications) rootElement.style.cssText += 'transition: margin-top .25s !important';
  336. 		document.body.appendChild(notification);
  337. 		// Note: offsetHeight is zero while the element is not part of the document DOM tree
  338. 		notification.style.cssText += 'top: -' + notification.offsetHeight + 'px !important';
  339. 		setTimeout(function() {
  340. 			//notificationOffsetTop += notification.offsetHeight;
  341. 			notification.style.cssText += 'top: ' + notificationOffsetTop + 'px !important';
  342. 			if (!notifications) rootElement.style.cssText += 'margin-top: ' + (marginTop + notification.offsetHeight) + 'px !important';
  343. 			notifications ++;
  344. 		}, 0)
  345. 		if (timeout) {
  346. 			setTimeout(function () {
  347. 				closeNotification();
  348. 			}, timeout);
  349. 		}
  350. 	}
  351.  
  352. 	function resetStyles(element) {
  353. 		if (element.tagName.toLowerCase() != 'button') {
  354. 			element.style.cssText = 'background: transparent !important';
  355. 			element.style.cssText += 'border: none !important';
  356. 			element.style.cssText += 'border-radius: 0 !important';
  357. 			if (element.tagName.toLowerCase() == 'a')
  358. 				element.style.cssText += 'cursor: pointer !important';
  359. 		}
  360. 		else element.style.cssText += 'cursor: auto !important';
  361. 		element.style.cssText += 'bottom: auto !important';
  362. 		element.style.cssText += 'box-shadow: none !important';
  363. 		element.style.cssText += 'color: WindowText !important';
  364. 		element.style.cssText += 'font: medium serif !important';
  365. 		element.style.cssText += 'letter-spacing: 0 !important';
  366. 		element.style.cssText += 'line-height: normal !important';
  367. 		element.style.cssText += 'margin: 0 !important';
  368. 		element.style.cssText += 'opacity: 1 !important';
  369. 		element.style.cssText += 'outline: none !important';
  370. 		element.style.cssText += 'padding: 0 !important';
  371. 		element.style.cssText += 'position: static !important';
  372. 		element.style.cssText += 'text-align: left !important';
  373. 		element.style.cssText += 'text-shadow: none !important';
  374. 		element.style.cssText += 'text-transform: none !important';
  375. 		element.style.cssText += 'left: auto !important';
  376. 		element.style.cssText += 'right: auto !important';
  377. 		element.style.cssText += 'top: auto !important';
  378. 		element.style.cssText += 'white-space: normal !important';
  379. 		element.style.cssText += 'width: auto !important';
  380. 	}
  381. })();

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