security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Code Releases Activity

Introduced maxFakeSize.

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This commit is contained in:
kkapsner 2016-05-10 08:01:21 +02:00
parent 8240bf6007
commit b8ba76300e
7 changed files with 37 additions and 23 deletions
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4
lib/intercept.js
View file

@ -9,7 +9,7 @@
var apiNames = Object.keys(changedFunctions);
var undef;
exports.intercept = function intercept({subject: window}, {check, ask, notify}){
exports.intercept = function intercept({subject: window}, {check, ask, notify, prefs}){
apiNames.forEach(function(name){
var changedFunction = changedFunctions[name];
var original = window.wrappedJSObject[changedFunction.object].prototype[name];
@ -35,7 +35,7 @@
return original;
case "fake":
notify({url: window.location.href, errorStack: error.stack}, window);
return changedFunction.fake || undef;
return changedFunction.fake || changedFunction.fakeGenerator(prefs) || undef;
//case "block":
default:
return undef;

31
lib/modifiedAPI.js
View file

@ -93,21 +93,24 @@
getImageData: {
type: "readout",
object: "CanvasRenderingContext2D",
fake: function getImageData(sx, sy, sw, sh){
var window = getWindow(this.canvas);
var context = (sw * sh > 300 * 400)?
this:
window.HTMLCanvasElement.prototype.getContext.call(
getFakeCanvas(window, this.canvas),
"2d"
);
var data = window.CanvasRenderingContext2D.prototype.getImageData.apply(context, arguments).data;
var imageData = new window.wrappedJSObject.ImageData(sw, sh);
for (var i = 0, l = data.length; i < l; i += 1){
imageData.data[i] = data[i];
fakeGenerator: function(prefs){
var maxSize = prefs("maxFakeSize") || Number.POSITIVE_INFINITY;
return function getImageData(sx, sy, sw, sh){
var window = getWindow(this.canvas);
var context = (sw * sh > maxSize)?
this:
window.HTMLCanvasElement.prototype.getContext.call(
getFakeCanvas(window, this.canvas),
"2d"
);
var data = window.CanvasRenderingContext2D.prototype.getImageData.apply(context, arguments).data;
var imageData = new window.wrappedJSObject.ImageData(sw, sh);
for (var i = 0, l = data.length; i < l; i += 1){
imageData.data[i] = data[i];
}
return imageData;
}
return imageData;
}
},
readPixels: {