security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Undo interception in top windows

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Fixes #431
This commit is contained in:
kkapsner 2020-01-23 13:56:14 +01:00
parent e2efb727b9
commit f3f6df229f
5 changed files with 122 additions and 58 deletions
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41
lib/extension.js
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@ -90,5 +90,46 @@
}
};
const changedPropertiesByWindow = new WeakMap();
scope.changeProperty = function(window, group, {object, name, type, changed}){
let changedProperties = changedPropertiesByWindow.get(scope.getWrapped(window));
if (!changedProperties){
changedProperties = [];
changedPropertiesByWindow.set(scope.getWrapped(window), changedProperties);
}
const descriptor = Object.getOwnPropertyDescriptor(object, name);
const original = descriptor[type];
descriptor[type] = changed;
Object.defineProperty(object, name, descriptor);
changedProperties.push({group, object, name, type, original});
};
scope.revertProperties = function(window, group){
window = scope.getWrapped(window);
let changedProperties = changedPropertiesByWindow.get(window);
if (!changedProperties){
return;
}
if (group){
const remainingProperties = changedProperties.filter(function({group}){
return group !== group;
});
changedPropertiesByWindow.set(window, remainingProperties);
changedProperties = changedProperties.filter(function({group}){
return group === group;
});
}
else {
changedPropertiesByWindow.delete(window);
}
for (let i = changedProperties.length - 1; i >= 0; i -= 1){
const {object, name, type, original} = changedProperties[i];
logging.verbose("reverting", name, "on", object);
const descriptor = Object.getOwnPropertyDescriptor(object, name);
descriptor[type] = original;
Object.defineProperty(object, name, descriptor);
}
};
Object.seal(scope);
}());