security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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mirror of https://github.com/kkapsner/CanvasBlocker synced 2025-01-03 18:42:00 +01:00
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First implementation

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kkapsner 2014-12-04 23:34:41 +01:00
parent 7e0195818b
commit caba7e33d0
4 changed files with 70 additions and 8 deletions
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57
data/inject.js
View File

@ -1,11 +1,15 @@
/* global self, window, console, unsafeWindow, exportFunction */ /* global self, window, console, unsafeWindow, exportFunction, cloneInto */
(function(){ (function(){
"use strict"; "use strict";
var blockMode = { var blockMode = {
getContext: { getContext: {
status: "block", status: "block",
askText: "askForPermission", askText: {
visible: "askForVisiblePermission",
invisible: "askForInvisiblePermission",
nocanvas: "askForPermission"
},
askStatus: { askStatus: {
askOnce: false, askOnce: false,
alreadyAsked: false, alreadyAsked: false,
@ -14,7 +18,11 @@
}, },
readAPI: { readAPI: {
status: "allow", status: "allow",
askText: "askForReadoutPermission", askText: {
visible: "askForVisibleReadoutPermission",
invisible: "askForInvisibleReadoutPermission",
nocanvas: "askForReadoutPermission"
},
askStatus: { askStatus: {
askOnce: false, askOnce: false,
alreadyAsked: false, alreadyAsked: false,
@ -33,6 +41,44 @@
return bytes; return bytes;
}()); }());
// Check canvas appearance
function canvasAppearance(context){
var oldBorder = false;
var canvas = false;
var visible = false;
if (context){
if (context.nodeName === "CANVAS"){
canvas = context;
}
else if (
context instanceof CanvasRenderingContext2D ||
context instanceof WebGLRenderingContext
){
canvas = context.canvas;
}
}
if (canvas){
oldBorder = canvas.style.border;
canvas.style.border = "2px solid red";
if (canvas.ownerDocument.contains(canvas)){
canvas.scrollIntoView();
var rect = canvas.getBoundingClientRect();
var foundEl = document.elementFromPoint(rect.left + rect.width / 2, rect.top + rect.height / 2);
visible = (foundEl === canvas);
}
}
return {
canvas: canvas,
text: canvas? (visible? "visible": "invisible"): "nocanvas",
visible: visible,
reset: function(){
if (canvas){
canvas.style.border = oldBorder;
}
}
};
}
// changed functions // changed functions
var changedFunctions = { var changedFunctions = {
getContext: { getContext: {
@ -101,10 +147,13 @@
status = askStatus.answer; status = askStatus.answer;
} }
else { else {
var appearance = canvasAppearance(this);
// console.log("asking"); // console.log("asking");
status = window.confirm(_(changedFunction.mode.askText))? "allow": "block"; status = window.confirm(_(changedFunction.mode.askText[appearance.text]))? "allow": "block";
askStatus.alreadyAsked = true; askStatus.alreadyAsked = true;
askStatus.answer = status; askStatus.answer = status;
appearance.reset();
} }
} }
switch (status){ switch (status){

9
lib/main.js
View File

@ -153,8 +153,13 @@
this.emit(blocking, true, prefs.askOnlyOnce); this.emit(blocking, true, prefs.askOnlyOnce);
} }
}); });
worker.port.emit("setTranslation", "askForPermission", _("askForPermission")); ["", "Readout"].forEach(function(type){
worker.port.emit("setTranslation", "askForReadoutPermission", _("askForReadoutPermission")); ["", "Visible", "Invisible"].forEach(function(visibility){
var text = "askFor" + visibility + type + "Permission";
worker.port.emit("setTranslation", text, _(text));
});
});
checkWorker(worker); checkWorker(worker);
}, },
}); });

4
locale/de-DE.properties
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@ -23,4 +23,8 @@ allowPDFCanvas_title= <canvas> in PDFs erlauben
allowPDFCanvas_description= Die native pdf.js verwendet <canvas> um den Inhalt von PDFs anzuzeigen. Wenn dies nicht markiert ist, werden viele Nachfragedialoge erscheinen oder die PDF Ansicht nicht funktionieren. allowPDFCanvas_description= Die native pdf.js verwendet <canvas> um den Inhalt von PDFs anzuzeigen. Wenn dies nicht markiert ist, werden viele Nachfragedialoge erscheinen oder die PDF Ansicht nicht funktionieren.
askForPermission= Wollen Sie <canvas> erlauben? askForPermission= Wollen Sie <canvas> erlauben?
askForVisiblePermission= Wollen Sie das rot umrandete <canvas> erlauben?
askForInvisiblePermission= Wollen Sie unsichtbare <canvas> erlauben?
askForReadoutPermission= Wollen Sie das Auslesen von <canvas> erlauben? askForReadoutPermission= Wollen Sie das Auslesen von <canvas> erlauben?
askForVisibleReadoutPermission= Wollen Sie das Auslesen des rot umrandeten <canvas> erlauben?
askForInvisibleReadoutPermission= Wollen Sie das Auslesen von unsichtbaren <canvas> erlauben?

4
locale/en-US.properties
View File

@ -23,4 +23,8 @@ allowPDFCanvas_title= Allow canvas in PDFs
allowPDFCanvas_description= The native pdf.js uses <canvas> to display the PDF content. If this is unchecked there will lots of annoying ask dialogs or the PDF display will not work. allowPDFCanvas_description= The native pdf.js uses <canvas> to display the PDF content. If this is unchecked there will lots of annoying ask dialogs or the PDF display will not work.
askForPermission= Do you want to allow <canvas>? askForPermission= Do you want to allow <canvas>?
askForVisiblePermission= Do you want to allow the red bordered <canvas>?
askForInvisiblePermission= Do you want to allow invisible <canvas>?
askForReadoutPermission= Do you want to allow <canvas> readout? askForReadoutPermission= Do you want to allow <canvas> readout?
askForVisibleReadoutPermission= Do you want to allow the readout of the red bordered <canvas>?
askForInvisibleReadoutPermission= Do you want to allow invisible <canvas> readout?