security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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kkapsner 2019-11-28 01:26:35 +01:00
parent b5e6d049ce
commit aef6bd3d59
58 changed files with 2074 additions and 1856 deletions
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43
lib/askForPermission.js
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@ -3,7 +3,7 @@
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
(function(){
"use strict";
var scope;
let scope;
if ((typeof exports) !== "undefined"){
scope = exports;
}
@ -15,15 +15,15 @@
// Check canvas appearance
function canvasAppearance(window, api, context){
var oldBorder = false;
var canvas = false;
var inDOM = null;
let oldBorder = false;
let canvas = false;
let inDOM = null;
if (api === "canvas" && context){
var nodeName;
let nodeName;
try {
nodeName = context.nodeName;
}
catch (e){
catch (error){
nodeName = "";
}
if (nodeName === "CANVAS"){
@ -45,17 +45,17 @@
canvas: canvas,
askCategory: canvas? (inDOM? "visible": "invisible"): (api === "canvas"? "nocanvas": api),
get text(){
var text = canvas? (this.visible? "visible": "invisible"): (api === "canvas"? "nocanvas": api);
const text = canvas? (this.visible? "visible": "invisible"): (api === "canvas"? "nocanvas": api);
Object.defineProperty(this, "text", {value: text});
return text;
},
inDom: inDOM,
get visible(){
var visible = inDOM;
let visible = inDOM;
if (inDOM){
canvas.scrollIntoView();
var rect = canvas.getBoundingClientRect();
var foundEl = window.document.elementFromPoint(
const rect = canvas.getBoundingClientRect();
const foundEl = window.document.elementFromPoint(
rect.left + rect.width / 2,
rect.top + rect.height / 2
);
@ -72,9 +72,9 @@
};
}
var modes = new WeakMap();
const modes = new WeakMap();
function getAskMode(window, type, _){
var mode = modes.get(window);
let mode = modes.get(window);
if (mode){
return mode[type];
}
@ -132,11 +132,11 @@
}
scope.ask = function({window, type, api, canvas, errorStack}, {_, prefs}){
var answer;
var askMode = getAskMode(window, type, _);
var askStatus = askMode.askStatus;
var appearance = canvasAppearance(window, api, canvas);
var category = appearance.askCategory;
let answer;
const askMode = getAskMode(window, type, _);
const askStatus = askMode.askStatus;
const appearance = canvasAppearance(window, api, canvas);
let category = appearance.askCategory;
if (prefs("askOnlyOnce") !== "no" && askStatus.alreadyAsked[category]){
// already asked
appearance.reset();
@ -146,7 +146,6 @@
let imgContainer = null;
if (type === "readout" && prefs("showCanvasWhileAsking") && canvas){
try {
let content = canvas.toDataURL();
let document = window.top.document;
imgContainer = document.createElement("div");
imgContainer.style.cssText = `
@ -177,12 +176,12 @@
imgContainer.appendChild(img);
document.body.appendChild(imgContainer);
}
catch (e){
catch (error){
// unable to read the canvas
}
}
// asking
var msg = askMode.askText[appearance.text];
let msg = askMode.askText[appearance.text];
// visible vs invisible is only calculated here correctly
category = appearance.text;
@ -196,8 +195,8 @@
if (prefs("askOnlyOnce") === "combined"){
["context", "readout", "input"].forEach(function(type){
var askMode = getAskMode(window, type, _);
var askStatus = askMode.askStatus;
const askMode = getAskMode(window, type, _);
const askStatus = askMode.askStatus;
askStatus.alreadyAsked[category] = true;
askStatus.answer[category] = answer;
});