security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Separated invisible and visible canvas asking

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This commit is contained in:
kkapsner 2014-08-17 23:32:23 +02:00
parent 8098c9177c
commit 430a9226dc
7 changed files with 146 additions and 26 deletions
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89
data/inject.js
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@ -16,6 +16,7 @@ function block(force){
unsafeWindow.HTMLCanvasElement.prototype.getContext = null;
}
}
function ask(force){
if (force || !checkPDF("ask")){
// console.log("ask");
@ -28,23 +29,69 @@ function ask(force){
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){
this.getContext = this["askFunctionName"];
return this["askFunctionName"].apply(this, arguments);
unsafeWindow.HTMLCanvasElement.prototype.getContext = new unsafeWindow.Function(
function(){
if (this.parentNode){
var oldBorder = this.style.border;
this.style.border = "2px dashed red";
var confirmText = "askForPermission";
var allow = confirm(confirmText);
this.style.border = oldBorder;
if (allow){
this.getContext = this["askFunctionName"];
return this["askFunctionName"].apply(this, arguments);
}
else {
this.getContext = null;
return null;
}
}
else {
return null;
}
}.toString()
.replace(/^function\s*\(\)\s*\{|\}\s*$/g, "")
.replace(/askFunctionName/g, askFunctionName)
.replace(/askForPermission/g, _("askForPermission"))
);
}
}
function askInvisible(force){
if (force || !checkPDF("askInvisible")){
// console.log("ask");
Object.defineProperty(
unsafeWindow.HTMLCanvasElement.prototype,
askFunctionName,
{
value: getContext,
enumerabe: false
}
else {
return null;
}
}.toString().replace(/^function\s*\(\)\s*\{|\}\s*$/g, "").replace(/askFunctionName/g, askFunctionName));
);
unsafeWindow.HTMLCanvasElement.prototype.getContext = new unsafeWindow.Function(
function(){
var oldBorder = this.style.border;
this.style.border = "2px dashed red";
var confirmText =
this.parentNode?
"askForPermission":
"askForInvisiblePermission";
var allow = confirm(confirmText);
this.style.border = oldBorder;
if (allow){
this.getContext = this["askFunctionName"];
return this["askFunctionName"].apply(this, arguments);
}
else {
this.getContext = null;
return null;
}
}.toString()
.replace(/^function\s*\(\)\s*\{|\}\s*$/g, "")
.replace(/askFunctionName/g, askFunctionName)
.replace(/askForPermission/g, _("askForPermission"))
.replace(/askForInvisiblePermission/g, _("askForInvisiblePermission"))
);
}
}
function unblock(){
@ -52,8 +99,16 @@ function unblock(){
unsafeWindow.HTMLCanvasElement.prototype.getContext = getContext;
}
ask();
var _ = function(name){
return _[name] || name;
}
self.port.on("setTranslation", function(name, translation){
_[name] = translation;
});
block();
self.port.on("block", block);
self.port.on("ask", ask);
self.port.on("askInvisible", askInvisible);
self.port.on("unblock", unblock);
self.port.on("detach", unblock);