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composer.postload.js
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composer.postload.js
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/*
* This file is part of Hola ad remover <https://adblockplus.org/>,
* Copyright (C) 2006-2016 Eyeo GmbH
*
* Hola ad remover is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* Hola ad remover is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Hola ad remover. If not, see <http://www.gnu.org/licenses/>.
*/
"use strict";
// The page ID for the popup filter selection dialog (top frame only).
let blockelementPopupId = null;
// Element picking state (top frame only).
let currentlyPickingElement = false;
let lastMouseOverEvent = null;
// During element picking this is the currently highlighted element. When
// element has been picked this is the element that is due to be blocked.
let currentElement = null;
// Highlighting state, used by the top frame during element picking and all
// frames when the chosen element is highlighted red.
let highlightedElementsSelector = null;
let highlightedElementsInterval = null;
// Last right click state stored for element blocking via the context menu.
let lastRightClickEvent = null;
let lastRightClickEventIsMostRecent = false;
/* Utilities */
function getFiltersForElement(element, callback)
{
ext.backgroundPage.sendMessage(
{
type: "composer.getFilters",
tagName: element.localName,
id: element.id,
src: element.getAttribute("src"),
style: element.getAttribute("style"),
classes: Array.prototype.slice.call(element.classList),
urls: getURLsFromElement(element),
mediatype: typeMap[element.localName],
baseURL: document.location.href
},
response =>
{
callback(response.filters, response.selectors);
});
}
function getBlockableElementOrAncestor(element, callback)
{
// We assume that the user doesn't want to block the whole page.
// So we never consider the <html> or <body> element.
while (element && element != document.documentElement &&
element != document.body)
{
// We can't handle non-HTML (like SVG) elements, as well as
// <area> elements (see below). So fall back to the parent element.
if (!(element instanceof HTMLElement) || element.localName == "area")
element = element.parentElement;
// If image maps are used mouse events occur for the <area> element.
// But we have to block the image associated with the <map> element.
else if (element.localName == "map")
{
let images = document.querySelectorAll("img[usemap]");
let image = null;
for (let i = 0; i < images.length; i++)
{
let usemap = images[i].getAttribute("usemap");
let index = usemap.indexOf("#");
if (index != -1 && usemap.substr(index + 1) == element.name)
{
image = images[i];
break;
}
}
element = image;
}
// Finally, if none of the above is true, check whether we can generate
// any filters for this element. Otherwise fall back to its parent element.
else
{
getFiltersForElement(element, filters =>
{
if (filters.length > 0)
callback(element);
else
getBlockableElementOrAncestor(element.parentElement, callback);
});
return;
}
}
// We reached the document root without finding a blockable element.
callback(null);
}
/* Element highlighting */
// Adds an overlay to an element, which is probably a Flash object.
function addElementOverlay(element)
{
let position = "absolute";
let offsetX = window.scrollX;
let offsetY = window.scrollY;
for (let e = element; e; e = e.parentElement)
{
let style = getComputedStyle(e);
// If the element isn't rendered (since its or one of its ancestor's
// "display" property is "none"), the overlay wouldn't match the element.
if (style.display == "none")
return null;
// If the element or one of its ancestors uses fixed postioning, the overlay
// must too. Otherwise its position might not match the element's.
if (style.position == "fixed")
{
position = "fixed";
offsetX = offsetY = 0;
}
}
let overlay = document.createElement("div");
overlay.prisoner = element;
overlay.className = "__adblockplus__overlay";
overlay.setAttribute("style", "opacity:0.4; display:inline-box; " +
"overflow:hidden; box-sizing:border-box;");
let rect = element.getBoundingClientRect();
overlay.style.width = rect.width + "px";
overlay.style.height = rect.height + "px";
overlay.style.left = (rect.left + offsetX) + "px";
overlay.style.top = (rect.top + offsetY) + "px";
overlay.style.position = position;
overlay.style.zIndex = 0x7FFFFFFE;
document.documentElement.appendChild(overlay);
return overlay;
}
function highlightElement(element, shadowColor, backgroundColor)
{
unhighlightElement(element);
let highlightWithOverlay = function()
{
let overlay = addElementOverlay(element);
// If the element isn't displayed no overlay will be added.
// Moreover, we don't need to highlight anything then.
if (!overlay)
return;
highlightElement(overlay, shadowColor, backgroundColor);
overlay.style.pointerEvents = "none";
element._unhighlight = () =>
{
overlay.parentNode.removeChild(overlay);
};
};
let highlightWithStyleAttribute = function()
{
let originalBoxShadow = element.style.getPropertyValue("box-shadow");
let originalBoxShadowPriority =
element.style.getPropertyPriority("box-shadow");
let originalBackgroundColor =
element.style.getPropertyValue("background-color");
let originalBackgroundColorPriority =
element.style.getPropertyPriority("background-color");
element.style.setProperty("box-shadow", "inset 0px 0px 5px " + shadowColor,
"important");
element.style.setProperty("background-color", backgroundColor, "important");
element._unhighlight = () =>
{
element.style.removeProperty("box-shadow");
element.style.setProperty(
"box-shadow",
originalBoxShadow,
originalBoxShadowPriority
);
element.style.removeProperty("background-color");
element.style.setProperty(
"background-color",
originalBackgroundColor,
originalBackgroundColorPriority
);
};
};
if ("prisoner" in element)
highlightWithStyleAttribute();
else
highlightWithOverlay();
}
function unhighlightElement(element)
{
if (element && "_unhighlight" in element)
{
element._unhighlight();
delete element._unhighlight;
}
}
// Highlight elements matching the selector string red.
// (All elements that would be blocked by the proposed filters.)
function highlightElements(selectorString)
{
unhighlightElements();
let elements = Array.prototype.slice.call(
document.querySelectorAll(selectorString)
);
highlightedElementsSelector = selectorString;
// Highlight elements progressively. Otherwise the page freezes
// when a lot of elements get highlighted at the same time.
highlightedElementsInterval = setInterval(() =>
{
if (elements.length > 0)
{
let element = elements.shift();
if (element != currentElement)
highlightElement(element, "#fd6738", "#f6e1e5");
}
else
{
clearInterval(highlightedElementsInterval);
highlightedElementsInterval = null;
}
}, 0);
}
// Unhighlight the elements that were highlighted by selector string previously.
function unhighlightElements()
{
if (highlightedElementsInterval)
{
clearInterval(highlightedElementsInterval);
highlightedElementsInterval = null;
}
if (highlightedElementsSelector)
{
Array.prototype.forEach.call(
document.querySelectorAll(highlightedElementsSelector),
unhighlightElement
);
highlightedElementsSelector = null;
}
}
/* Input event handlers */
function stopEventPropagation(event)
{
event.stopPropagation();
}
// Hovering over an element so highlight it.
function mouseOver(event)
{
lastMouseOverEvent = event;
getBlockableElementOrAncestor(event.target, element =>
{
if (event == lastMouseOverEvent)
{
lastMouseOverEvent = null;
if (currentlyPickingElement)
{
if (currentElement)
unhighlightElement(currentElement);
if (element)
highlightElement(element, "#d6d84b", "#f8fa47");
currentElement = element;
}
}
});
event.stopPropagation();
}
// No longer hovering over this element so unhighlight it.
function mouseOut(event)
{
if (!currentlyPickingElement || currentElement != event.target)
return;
unhighlightElement(currentElement);
event.stopPropagation();
}
// Key events - Return selects currently hovered-over element, escape aborts.
function keyDown(event)
{
if (!event.ctrlKey && !event.altKey && !event.shiftKey)
{
if (event.keyCode == 13) // Return
elementPicked(event);
else if (event.keyCode == 27) // Escape
deactivateBlockElement();
}
}
/* Element selection */
// Start highlighting elements yellow as the mouse moves over them, when one is
// chosen launch the popup dialog for the user to confirm the generated filters.
function startPickingElement()
{
currentlyPickingElement = true;
// Add overlays for blockable elements that don't emit mouse events,
// so that they can still be selected.
Array.prototype.forEach.call(
document.querySelectorAll("object,embed,iframe,frame"),
element =>
{
getFiltersForElement(element, filters =>
{
if (filters.length > 0)
addElementOverlay(element);
});
}
);
document.addEventListener("mousedown", stopEventPropagation, true);
document.addEventListener("mouseup", stopEventPropagation, true);
document.addEventListener("mouseenter", stopEventPropagation, true);
document.addEventListener("mouseleave", stopEventPropagation, true);
document.addEventListener("mouseover", mouseOver, true);
document.addEventListener("mouseout", mouseOut, true);
document.addEventListener("click", elementPicked, true);
document.addEventListener("contextmenu", elementPicked, true);
document.addEventListener("keydown", keyDown, true);
ext.onExtensionUnloaded.addListener(deactivateBlockElement);
}
// The user has picked an element - currentElement. Highlight it red, generate
// filters for it and open a popup dialog so that the user can confirm.
function elementPicked(event)
{
if (!currentElement)
return;
let element = currentElement.prisoner || currentElement;
getFiltersForElement(element, (filters, selectors) =>
{
if (currentlyPickingElement)
stopPickingElement();
ext.backgroundPage.sendMessage(
{
type: "composer.openDialog"
},
popupId =>
{
ext.backgroundPage.sendMessage(
{
type: "forward",
targetPageId: popupId,
payload:
{
type: "composer.dialog.init",
filters: filters
}
});
// Only the top frame keeps a record of the popup window's ID,
// so if this isn't the top frame we need to pass the ID on.
if (window == window.top)
{
blockelementPopupId = popupId;
}
else
{
ext.backgroundPage.sendMessage(
{
type: "forward",
payload:
{
type: "composer.content.dialogOpened",
popupId: popupId
}
});
}
});
if (selectors.length > 0)
highlightElements(selectors.join(","));
highlightElement(currentElement, "#fd1708", "#f6a1b5");
});
event.preventDefault();
event.stopPropagation();
}
function stopPickingElement()
{
currentlyPickingElement = false;
document.removeEventListener("mousedown", stopEventPropagation, true);
document.removeEventListener("mouseup", stopEventPropagation, true);
document.removeEventListener("mouseenter", stopEventPropagation, true);
document.removeEventListener("mouseleave", stopEventPropagation, true);
document.removeEventListener("mouseover", mouseOver, true);
document.removeEventListener("mouseout", mouseOut, true);
document.removeEventListener("click", elementPicked, true);
document.removeEventListener("contextmenu", elementPicked, true);
document.removeEventListener("keydown", keyDown, true);
}
/* Core logic */
// We're done with the block element feature for now, tidy everything up.
function deactivateBlockElement()
{
if (currentlyPickingElement)
stopPickingElement();
if (blockelementPopupId != null)
{
ext.backgroundPage.sendMessage(
{
type: "forward",
targetPageId: blockelementPopupId,
payload:
{
type: "composer.dialog.close"
}
});
blockelementPopupId = null;
}
lastRightClickEvent = null;
if (currentElement)
{
unhighlightElement(currentElement);
currentElement = null;
}
unhighlightElements();
let overlays = document.getElementsByClassName("__adblockplus__overlay");
while (overlays.length > 0)
overlays[0].parentNode.removeChild(overlays[0]);
ext.onExtensionUnloaded.removeListener(deactivateBlockElement);
}
// In Chrome 37-40, the document_end content script (this one) runs properly,
// while the document_start content scripts (that defines ext) might not. Check
// whether variable ext exists before continuing to avoid
// "Uncaught ReferenceError: ext is not defined". See https://crbug.com/416907
if ("ext" in window && document instanceof HTMLDocument)
{
// Use a contextmenu handler to save the last element the user right-clicked
// on. To make things easier, we actually save the DOM event. We have to do
// this because the contextMenu API only provides a URL, not the actual DOM
// element.
// We also need to make sure that the previous right click event,
// if there is one, is removed. We don't know which frame it is in so we must
// send a message to the other frames to clear their old right click events.
document.addEventListener("contextmenu", event =>
{
lastRightClickEvent = event;
lastRightClickEventIsMostRecent = true;
ext.backgroundPage.sendMessage(
{
type: "forward",
payload:
{
type: "composer.content.clearPreviousRightClickEvent"
}
});
}, true);
ext.onMessage.addListener((msg, sender, sendResponse) =>
{
switch (msg.type)
{
case "composer.content.getState":
if (window == window.top)
sendResponse({
active: currentlyPickingElement || blockelementPopupId != null
});
break;
case "composer.content.startPickingElement":
if (window == window.top)
startPickingElement();
break;
case "composer.content.contextMenuClicked":
let event = lastRightClickEvent;
deactivateBlockElement();
if (event)
{
getBlockableElementOrAncestor(event.target, element =>
{
if (element)
{
currentElement = element;
elementPicked(event);
}
});
}
break;
case "composer.content.finished":
if (currentElement && msg.remove)
{
// Hide the selected element itself if an added blocking
// filter is causing it to collapse. Note that this
// behavior is incomplete, but the best we can do here,
// e.g. if an added blocking filter matches other elements,
// the effect won't be visible until the page is is reloaded.
checkCollapse(currentElement.prisoner || currentElement);
// Apply added element hiding filters.
updateStylesheet();
}
deactivateBlockElement();
break;
case "composer.content.clearPreviousRightClickEvent":
if (!lastRightClickEventIsMostRecent)
lastRightClickEvent = null;
lastRightClickEventIsMostRecent = false;
break;
case "composer.content.dialogOpened":
if (window == window.top)
blockelementPopupId = msg.popupId;
break;
case "composer.content.dialogClosed":
// The onRemoved hook for the popup can create a race condition, so we
// to be careful here. (This is not perfect, but best we can do.)
if (window == window.top && blockelementPopupId == msg.popupId)
{
ext.backgroundPage.sendMessage(
{
type: "forward",
payload:
{
type: "composer.content.finished"
}
});
}
break;
}
});
if (window == window.top)
ext.backgroundPage.sendMessage({type: "composer.ready"});
}