security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
1
0
Fork 0
mirror of https://github.com/kkapsner/CanvasBlocker synced 2025-07-04 12:36:37 +02:00
Code Releases Activity

Added black list and ask.

Browse source
This commit is contained in:
kkapsner 2014-08-01 12:03:23 +02:00
parent 0ab4f1b7d3
commit ebe1d66ad5
4 changed files with 113 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

36
data/inject.js
View file

@ -1,12 +1,46 @@
var getContext = unsafeWindow.HTMLCanvasElement.prototype.getContext
var getContext = unsafeWindow.HTMLCanvasElement.prototype.getContext;
var askFunctionName = Math.random().toString(16);
function block(){
// consoe.log("block");
delete unsafeWindow.HTMLCanvasElement.prototype[askFunctionName];
unsafeWindow.HTMLCanvasElement.prototype.getContext = null;
}
function ask(){
// console.log("ask");
Object.defineProperty(
unsafeWindow.HTMLCanvasElement.prototype,
askFunctionName,
{
value: getContext,
enumerabe: false
}
);
unsafeWindow.HTMLCanvasElement.prototype.getContext = new unsafeWindow.Function(function(){
var oldBorder = this.style.border;
this.style.border = "2px dashed red";
var confirmText =
this.parentNode?
"Do you want to allow the red bordered <canvas>?":
"Do you want to allow an invisibe <canvas>?";
var allow = confirm(confirmText);
this.style.border = oldBorder;
if (allow){
return this["askFunctionName"].apply(this, arguments);
}
else {
return null;
}
}.toString().replace(/^function\s*\(\)\s*\{|\}\s*$/g, "").replace("askFunctionName", askFunctionName));
}
function unblock(){
// console.log("unblock");
unsafeWindow.HTMLCanvasElement.prototype.getContext = getContext;
}
ask();
self.port.on("block", block);
self.port.on("ask", ask);
self.port.on("unblock", unblock);
self.port.on("detach", unblock);