Simple but effective popup window blocker. Also tries to deny unsolicited redirections.
// ==UserScript==
// @name Pop-Up Blocker
// @namespace HTML
// @description Simple but effective popup window blocker. Also tries to deny unsolicited redirections.
// @include *
// @version $Id$
// @grant none
// @run-at document-start
// ==/UserScript==
(function () {
var BLOCK_MODE = {'ALL': 0, // Block all popups
'CONFIRM': 2, // Confirm each popup (not recommended, but useful for testing)
'GRANT_PERIOD': 4, // Block popups that are initiated after the mouse click grant period
'ALLOW_SECURE': 8, // Allow popups from secure (HTTPS) sites (default don't allow)
'ALLOW_REDIRECTS': 16, // Allow unsolicited redirects (default block)
'CONFIRM_UNLOAD': 32} // Confirm assumed unsolicited page unload (default don't confirm)
// Configuration
var block_mode = BLOCK_MODE.ALL;
var grant_period = 100; // Milliseconds
var debug = false; // Enable debug logging
// DO NOT CHANGE BELOW THIS POINT
var allowed_elements = {'a': true, 'button': {'type': 'submit'}, 'input': true, 'select': true, 'option': true};
var ts = 0, wopen = window.open, showmodaldlg = window.showModalDialog;
var lastInteractedElement;
var marginTop = null;
var notifications = 0;
var notificationOffsetTop = 0;
function confirmed(msg, arguments) {
return block_mode & BLOCK_MODE.CONFIRM ? confirmPopup(msg, arguments) : false;
}
function grantperiod_exceeded() {
return block_mode & BLOCK_MODE.GRANT_PERIOD ? Date.now() > ts + grant_period : true;
}
function protocol_allowed() {
return block_mode & BLOCK_MODE.ALLOW_SECURE ? location.protocol == 'https:' : false;
}
function element_allowed(element) {
var allowed = element.tagName && allowed_elements[element.tagName.toLowerCase()];
if (allowed && typeof allowed == "object") {
for (var property in allowed) if (element[property] != element[property]) return false;
}
return allowed;
}
window.addEventListener('mousedown', function (event) {
ts = Date.now();
if (debug) console.info('Mouse button', event.button != null ? event.button : event.which, 'down on', event.target);
setlastInteractedElement(event);
//mediateEventPropagation(event);
}, true);
window.addEventListener('click', function (event) {
ts = Date.now();
if (debug) console.info('Mouse button', event.button != null ? event.button : event.which, 'click on', event.target);
setlastInteractedElement(event);
//mediateEventPropagation(event);
}, true);
window.addEventListener('change', function (event) {
ts = Date.now();
if (debug) console.info('Changed selection on', event.target);
setlastInteractedElement(event);
//mediateEventPropagation(event);
}, true);
function setlastInteractedElement(event) {
// Deal with tags nested in (e.g.) links
var element = event.target;
if (event instanceof MouseEvent && (event.button != null ? event.button != 0 : event.which != 1)) return;
while (element.parentElement && !element_allowed(element)) {
element = element.parentElement;
}
lastInteractedElement = element;
if (debug) console.info('Last interacted element', element);
}
function mediateEventPropagation(event) {
// Stop event propagation if element has a 'href' attribute that does not point to the current document
// (prevents click hijacking)
if (!protocol_allowed() &&
lastInteractedElement &&
lastInteractedElement.href &&
boildown(lastInteractedElement.href) != boildown(window.location.href) &&
lastInteractedElement.href.indexOf('javascript:') !== 0) {
event.stopPropagation();
console.warn('Pop-Up Blocker stopped event propagation for', event);
}
}
function regExpEscape(s) {
return String(s).replace(/([-()\[\]{}+?*.$\^|,:#<!\\])/g, '\\$1').
replace(/\x08/g, '\\x08');
};
var regExpProtHostPathQ = new RegExp('^((' + regExpEscape(location.protocol) + '//' + regExpEscape(location.host) + ')?' +
'(' + regExpEscape(location.pathname) + ')?)?');
function boildown(uri) {
var uri_boileddown = uri.replace(regExpProtHostPathQ, ''); // Strip current protocol + host + path
uri_boileddown = uri_boileddown.replace(/#.*$/, ''); // Strip any hash
// Sort query vars
var query = uri_boileddown.match(/\?[^?]+/);
if (query)
query = '?' + query[0].substr(1).split('&').sort().join('&');
uri_boileddown = uri_boileddown.replace(/\?[^?]+/, query || '');
return uri_boileddown;
};
// Deny unsolicited redirection
if (!(block_mode & BLOCK_MODE.ALLOW_REDIRECTS) && typeof window.location.watch == 'function') window.location.watch(
'href',
function (id, oldval, newval) {
var href_boileddown, newval_boileddown = boildown(newval);
console.info('location.' + id, '->', newval);
if (lastInteractedElement && lastInteractedElement.tagName &&
lastInteractedElement.tagName.toLowerCase() == 'a')
href_boileddown = boildown(lastInteractedElement.href);
var link_hijacked = href_boileddown != undefined && newval.indexOf('#') !== 0 && newval_boileddown != href_boileddown;
if (debug) {
console.info('Page secure?', location.protocol == 'https:');
if (block_mode & BLOCK_MODE.ALLOW_SECURE) console.info('Allowed protocol?', protocol_allowed());
console.info('Last interacted element?', lastInteractedElement);
if (lastInteractedElement) {
console.info('Last interacted element tag name?', lastInteractedElement.tagName);
if (lastInteractedElement.tagName) {
console.info('Allowed element?', !!element_allowed(lastInteractedElement));
console.info('Last interacted element is link?', lastInteractedElement.tagName.toLowerCase() == 'a');
if (lastInteractedElement.tagName.toLowerCase() == 'a') {
console.info('New location (boiled down) =', newval_boileddown);
console.info('Link HREF (boiled down) =', href_boileddown);
console.info('New location is the same as link HREF?', newval_boileddown == href_boileddown);
console.info('Link target is a new window?', lastInteractedElement.target == '_blank');
}
}
}
if (block_mode & BLOCK_MODE.GRANT_PERIOD) console.info('Grant period exceeded?', grantperiod_exceeded());
}
if ((!protocol_allowed() || grantperiod_exceeded()) &&
(!lastInteractedElement ||
(!element_allowed(lastInteractedElement) ||
(/*lastInteractedElement.tagName.toLowerCase() == 'a' &&*/
(link_hijacked ||
lastInteractedElement.target == '_blank'))))) {
notify('Denied redirection to', newval, null, 0, null, '_self');
console.error('Pop-Up Blocker denied redirection to ' + newval);
return '#' + location.hash.replace(/^#/, '');
}
return newval;
}
);
var onbeforeunload = window.onbeforeunload;
if (block_mode & BLOCK_MODE.CONFIRM_UNLOAD) window.onbeforeunload = function (e) {
if (debug) console.info('window.', e);
if (!protocol_allowed()) {
if (debug) {
console.info('Page secure?', location.protocol == 'https:');
if (block_mode & BLOCK_MODE.ALLOW_SECURE) console.info('Allowed protocol?', protocol_allowed());
console.info('Last interacted element?', lastInteractedElement);
if (lastInteractedElement) {
console.info('Last interacted element tag name?', lastInteractedElement.tagName);
if (lastInteractedElement.tagName) {
console.info('Allowed element?', !!element_allowed(lastInteractedElement));
}
}
if (block_mode & BLOCK_MODE.GRANT_PERIOD) console.info('Grant period exceeded?', grantperiod_exceeded());
}
console.warn('You are possibly involuntarily being redirected to another page.');
(e || window.event).returnValue = 'You are possibly involuntarily being redirected to another page. Do you want to leave ' + location.href + ' or stay?';
return (e || window.event).returnValue;
}
else if (typeof onbeforeunload === 'function')
return onbeforeunload.apply(window, arguments);
};
//var onkeydown = window.onkeydown;
//window.onkeydown = function (e) {
//lastInteractedElement = null;
//if (typeof onkeydown === 'function')
//return onkeydown.apply(window, arguments);
//};
//var onmouseleave = document.body.onmouseleave;
//document.body.onmouseleave = function (e) {
//lastInteractedElement = null;
//if (typeof onmouseleave === 'function')
//return onmouseleave.apply(document.body, arguments);
//};
function confirmPopup(msg, args) {
return confirm(msg + ' (' + Array.prototype.slice.apply(arguments).join(', ') + ')');
}
window.open = function () {
var oargs = arguments;
if (debug) {
console.info('Page secure?', location.protocol == 'https:');
if (block_mode & BLOCK_MODE.ALLOW_SECURE) console.info('Allowed protocol?', protocol_allowed());
if (block_mode & BLOCK_MODE.GRANT_PERIOD) console.info('Grant period exceeded?', grantperiod_exceeded());
}
if (/*['_self', '_parent', '_top'].includes(arguments[1]) ||*/
(confirmed('Allow popup?', arguments) &&
(protocol_allowed() || !grantperiod_exceeded()))) {
console.info('Pop-Up Blocker allowed window.open', Array.prototype.slice.apply(arguments));
return wopen.apply(window, arguments);
}
else {
console.error('Pop-Up Blocker blocked window.open', Array.prototype.slice.apply(arguments));
notify('Blocked popup window', arguments[0], arguments[1], 0, function() {
console.info('Pop-Up Blocker user clicked window.open', Array.prototype.slice.apply(oargs));
wopen.apply(window, oargs);
});
}
return {}
};
window.showModalDialog = function () {
if (debug) {
console.info('Page secure?', location.protocol == 'https:');
if (block_mode & BLOCK_MODE.ALLOW_SECURE) console.info('Allowed protocol?', protocol_allowed());
if (block_mode & BLOCK_MODE.GRANT_PERIOD) console.info('Grant period exceeded?', grantperiod_exceeded());
}
if (confirmed('Allow modal dialog?', arguments) &&
(protocol_allowed() || !grantperiod_exceeded())) {
console.info('Pop-Up Blocker allowed window.showModalDialog', Array.prototype.slice.apply(arguments));
return showmodaldlg.apply(window, arguments);
}
else {
console.error('Pop-Up Blocker blocked modal showModalDialog', Array.prototype.slice.apply(arguments));
notify('Blocked modal dialog', arguments[0], null, 0, function() {
console.info('Pop-Up Blocker user clicked window.showModalDialog', Array.prototype.slice.apply(oargs));
showmodaldlg.apply(window, oargs);
});
}
return {}
};
function notify(text, uri, title, timeout, onclick, target) {
var rootElement = document.body.parentElement,
notification = document.createElement('div');
notification.onclick = function () {
return false;
}
if (marginTop === null) marginTop = parseFloat((rootElement.currentStyle || window.getComputedStyle(rootElement)).marginTop)
resetStyles(notification);
notification.style.cssText += 'background: InfoBackground !important';
notification.style.cssText += 'border-bottom: 1px solid WindowFrame !important';
notification.style.cssText += 'box-sizing: border-box !important';
notification.style.cssText += 'font: small-caption !important';
notification.style.cssText += 'padding: .15em .9em !important';
notification.style.cssText += 'position: fixed !important';
notification.style.cssText += 'left: 0 !important';
notification.style.cssText += 'line-height: 2.3 !important'; // 31px
notification.style.cssText += 'right: 0 !important';
notification.style.cssText += 'top: -100% !important';
notification.style.cssText += 'transition: top .25s !important';
notification.style.cssText += 'width: 100% !important';
notification.style.cssText += 'white-space: nowrap !important';
notification.style.cssText += 'z-index: 2147483647 !important';
var closeButton = document.createElement('span');
resetStyles(closeButton);
closeButton.style.cssText += 'cursor: pointer !important';
closeButton.style.cssText += 'display: inline-block !important';
closeButton.style.cssText += 'float: right !important';
closeButton.style.cssText += 'font: inherit !important';
closeButton.style.cssText += 'line-height: 2.1 !important';
closeButton.style.cssText += 'margin-left: .75em !important';
closeButton.appendChild(document.createTextNode('╳'));
function closeNotification(event) {
if (event) event.stopPropagation();
//notificationOffsetTop -= notification.offsetHeight;
if (!--notifications) rootElement.style.cssText += 'margin-top: ' + marginTop + ' !important';
notification.style.cssText += 'top: -' + notification.offsetHeight + 'px !important';
setTimeout(function () {
document.body.removeChild(notification);
}, 250);
return false;
}
closeButton.onclick = closeNotification;
notification.appendChild(closeButton);
notification.appendChild(document.createTextNode('🚫 ' + text));
var numLinks = target == '_self' ? 1 : 2;
for (var i = 0; i < numLinks; i ++) {
var popupLink = document.createElement(!i ? 'a' : 'button');
resetStyles(popupLink);
if (i) {
popupLink.style.cssText += '-moz-appearance: button !important';
popupLink.style.cssText += '-webkit-appearance: button !important';
popupLink.style.cssText += 'appearance: button !important';
popupLink.style.cssText += 'background: ButtonFace !important';
popupLink.style.cssText += 'border: 1px solid ButtonShadow !important';
popupLink.style.cssText += 'color: ButtonText !important';
popupLink.style.cssText += 'font: small-caption !important';
popupLink.style.cssText += 'padding: .15em .5em !important';
}
else {
popupLink.style.cssText += 'color: #00e !important';
popupLink.style.cssText += 'color: -moz-nativehyperlinktext !important';
popupLink.style.cssText += 'display: inline-block !important';
popupLink.style.cssText += 'font: inherit !important';
popupLink.style.cssText += 'max-width: 50% !important';
popupLink.style.cssText += 'overflow: hidden !important';
popupLink.style.cssText += 'text-decoration: underline !important';
popupLink.style.cssText += 'text-overflow: ellipsis !important';
popupLink.style.cssText += 'vertical-align: bottom !important';
popupLink.style.cssText += 'white-space: nowrap !important';
popupLink.setAttribute('href', uri);
popupLink.setAttribute('target', target || '_blank');
}
if (title) popupLink.setAttribute('title', title);
var linkText = i ? 'Open in this frame' : uri;
popupLink.appendChild(document.createTextNode(linkText));
popupLink.onclick = function(event) {
event.stopPropagation();
closeNotification();
if (this.tagName.toLowerCase() != 'a') {
location.href = uri;
}
else if (onclick) {
onclick(event);
return false;
}
};
notification.appendChild(document.createTextNode(' '));
notification.appendChild(popupLink);
}
if (!notifications) rootElement.style.cssText += 'transition: margin-top .25s !important';
document.body.appendChild(notification);
// Note: offsetHeight is zero while the element is not part of the document DOM tree
notification.style.cssText += 'top: -' + notification.offsetHeight + 'px !important';
setTimeout(function() {
//notificationOffsetTop += notification.offsetHeight;
notification.style.cssText += 'top: ' + notificationOffsetTop + 'px !important';
if (!notifications) rootElement.style.cssText += 'margin-top: ' + (marginTop + notification.offsetHeight) + 'px !important';
notifications ++;
}, 0)
if (timeout) {
setTimeout(function () {
closeNotification();
}, timeout);
}
}
function resetStyles(element) {
if (element.tagName.toLowerCase() != 'button') {
element.style.cssText = 'background: transparent !important';
element.style.cssText += 'border: none !important';
element.style.cssText += 'border-radius: 0 !important';
if (element.tagName.toLowerCase() == 'a')
element.style.cssText += 'cursor: pointer !important';
}
else element.style.cssText += 'cursor: auto !important';
element.style.cssText += 'bottom: auto !important';
element.style.cssText += 'box-shadow: none !important';
element.style.cssText += 'color: WindowText !important';
element.style.cssText += 'font: medium serif !important';
element.style.cssText += 'letter-spacing: 0 !important';
element.style.cssText += 'line-height: normal !important';
element.style.cssText += 'margin: 0 !important';
element.style.cssText += 'opacity: 1 !important';
element.style.cssText += 'outline: none !important';
element.style.cssText += 'padding: 0 !important';
element.style.cssText += 'position: static !important';
element.style.cssText += 'text-align: left !important';
element.style.cssText += 'text-shadow: none !important';
element.style.cssText += 'text-transform: none !important';
element.style.cssText += 'left: auto !important';
element.style.cssText += 'right: auto !important';
element.style.cssText += 'top: auto !important';
element.style.cssText += 'white-space: normal !important';
element.style.cssText += 'width: auto !important';
}
})();