security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Suppressed notification if maxFakeSize triggers.

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This commit is contained in:
kkapsner 2016-05-11 08:58:45 +02:00
parent b8ba76300e
commit 37fd9f7a36
4 changed files with 24 additions and 6 deletions
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BIN
CanvasBlocker@kkapsner.de-0.3.1-Development.xpi
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16
lib/intercept.js
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@ -34,8 +34,20 @@
case "allow": case "allow":
return original; return original;
case "fake": case "fake":
notify({url: window.location.href, errorStack: error.stack}, window); if (changedFunction.fake){
return changedFunction.fake || changedFunction.fakeGenerator(prefs) || undef;
return changedFunction.fake;
}
else {
if (changedFunction.fakeGenerator) {
return changedFunction.fakeGenerator(prefs, function(){
notify({url: window.location.href, errorStack: error.stack}, window);
});
}
else {
return undef;
}
}
//case "block": //case "block":
default: default:
return undef; return undef;

13
lib/modifiedAPI.js
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@ -93,16 +93,21 @@
getImageData: { getImageData: {
type: "readout", type: "readout",
object: "CanvasRenderingContext2D", object: "CanvasRenderingContext2D",
fakeGenerator: function(prefs){ fakeGenerator: function(prefs, notify){
var maxSize = prefs("maxFakeSize") || Number.POSITIVE_INFINITY; var maxSize = prefs("maxFakeSize") || Number.POSITIVE_INFINITY;
return function getImageData(sx, sy, sw, sh){ return function getImageData(sx, sy, sw, sh){
var window = getWindow(this.canvas); var window = getWindow(this.canvas);
var context = (sw * sh > maxSize)? var context;
this: if (sw * sh > maxSize){
window.HTMLCanvasElement.prototype.getContext.call( context = this;
}
else {
notify();
context = window.HTMLCanvasElement.prototype.getContext.call(
getFakeCanvas(window, this.canvas), getFakeCanvas(window, this.canvas),
"2d" "2d"
); );
}
var data = window.CanvasRenderingContext2D.prototype.getImageData.apply(context, arguments).data; var data = window.CanvasRenderingContext2D.prototype.getImageData.apply(context, arguments).data;
var imageData = new window.wrappedJSObject.ImageData(sw, sh); var imageData = new window.wrappedJSObject.ImageData(sw, sh);

1
lib/notifications.js
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@ -119,5 +119,6 @@ exports.notify = function({url, errorStack}, {lists, notificationPref, _, browse
notification.domain = domain; notification.domain = domain;
notification.callingStackMsg = callingStackMsg; notification.callingStackMsg = callingStackMsg;
} }
return notification;
} }
}; };