security-and-privacy/CanvasBlocker
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document.write and document.writeln protection broke pages

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Fixes #365
This commit is contained in:
kkapsner 2019-06-11 23:09:13 +02:00
parent 27ddc8a683
commit 1737344480
3 changed files with 34 additions and 25 deletions
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54
lib/iframeProtection.js
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@ -159,20 +159,22 @@
"write"
);
const documentWrite = documentWriteDescriptor.value;
documentWriteDescriptor.value = exportFunction(function write(str){
str = "" + str;
// weird problem with waterfox and google docs
const parts = (
str.match(/^\s*<!doctype/i) &&
!str.match(/frame/i)
)? [str]: str.split(/(?=<)/);
const length = parts.length;
const scripts = window.document.getElementsByTagName("script");
for (let i = 0; i < length; i += 1){
documentWrite.call(this, parts[i]);
allCallback();
if (scripts.length && scripts[scripts.length - 1].src){
observe();
documentWriteDescriptor.value = exportFunction(function write(markup){
for (let i = 0, l = arguments.length; i < l; i += 1){
const str = "" + arguments[i];
// weird problem with waterfox and google docs
const parts = (
str.match(/^\s*<!doctype/i) &&
!str.match(/frame/i)
)? [str]: str.split(/(?=<)/);
const length = parts.length;
const scripts = window.document.getElementsByTagName("script");
for (let i = 0; i < length; i += 1){
documentWrite.call(this, parts[i]);
allCallback();
if (scripts.length && scripts[scripts.length - 1].src){
observe();
}
}
}
}, window);
@ -186,19 +188,21 @@
"writeln"
);
const documentWriteln = documentWritelnDescriptor.value;
documentWritelnDescriptor.value = exportFunction(function writeln(str){
str = "" + str;
const parts = str.split(/(?=<)/);
const length = parts.length - 1;
const scripts = window.document.getElementsByTagName("script");
for (let i = 0; i < length; i += 1){
documentWrite.call(this, parts[i]);
allCallback();
if (scripts.length && scripts[scripts.length - 1].src){
observe();
documentWritelnDescriptor.value = exportFunction(function writeln(markup){
for (let i = 0, l = arguments.length; i < l; i += 1){
const str = "" + arguments[i];
const parts = str.split(/(?=<)/);
const length = parts.length;
const scripts = window.document.getElementsByTagName("script");
for (let i = 0; i < length; i += 1){
documentWrite.call(this, parts[i]);
allCallback();
if (scripts.length && scripts[scripts.length - 1].src){
observe();
}
}
}
documentWriteln.call(this, parts[length]);
documentWriteln.call(this, "");
}, window);
Object.defineProperty(wrappedWindow.HTMLDocument.prototype, "writeln", documentWritelnDescriptor);
};