How do I get around window.opener cross-domain security
I just found out that window.opener is not available in a window opened via window.open if the new URL is cross-domain, in IE. How do I detect window opener in IE
This will happen if the window starts in my domain, leaves it, and then comes back to my domain. I am attempting to have a social signup ( facebook, google, etc ) in the popup. When it completes it should close the new window and redirect the opener.
I know that Soundcloud is pulling this off, but I have no idea how. I see the URL change from theirs to Facebook, and then close.
After redirecting back to my site from 3rd party I run this:
var data = {
type : 'complete',
destination : '<?= $destination; ?>'
};
if ( window.opener ) {
window.opener.postMessage( JSON.stringify( data ), '*' );
window.close();
}
else {
alert( "Unable to find window" );
}
It alerts out in IE, even though the window was originally my domain, which then redirected to FB, then redirected back to me. I thought may since I open my site and redirect immediately from PHP that may be an issue. However even when I opened my site, did window.location.href = 'facebookssite.com' it still complained when returning.
NOTE
Social signups do not work for google, FB, etc within an iframe. I believe they disallow them for security reasons.
Solution 1:
Do it the other way around. Track the state of the child popup window from the main (opener) window, and you could easily know when the child window has been navigated back to you domain, so you could "talk" to it again. But don't close the child window by itself. Let the opener window obtain the result from the child window and then close it.
For example, main.html:
<!DOCTYPE html>
<head>
<title>main</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<script>
window.addEventListener("message", function(ev) {
if (ev.data.message === "deliverResult") {
alert("result: " + ev.data.result);
ev.source.close();
}
});
function Go() {
var child = window.open("child.html", "_blank", "height=200,width=200");
var leftDomain = false;
var interval = setInterval(function() {
try {
if (child.document.domain === document.domain) {
if (leftDomain && child.document.readyState === "complete") {
// we're here when the child window returned to our domain
clearInterval(interval);
alert("returned: " + child.document.URL);
child.postMessage({ message: "requestResult" }, "*");
}
}
else {
// this code should never be reached,
// as the x-site security check throws
// but just in case
leftDomain = true;
}
}
catch(e) {
// we're here when the child window has been navigated away or closed
if (child.closed) {
clearInterval(interval);
alert("closed");
return;
}
// navigated to another domain
leftDomain = true;
}
}, 500);
}
</script>
</head>
<body>
<button onclick="Go()">Go</button>
</body>
child.html:
<!DOCTYPE html>
<head>
<title>child</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<script>
window.addEventListener("message", function(ev) {
if (ev.data.message === "requestResult") {
// ev.source is the opener
ev.source.postMessage({ message: "deliverResult", result: true }, "*");
}
});
</script>
</head>
<body>
<a href="http://www.example.com">Go to example.com</a>
Then click the browser Back button when ready.
</body>
Tested with IE10.
Solution 2:
Due to security reason, window.opener is removed when redirecting to a different domain. The browser does not bother to restore the window.opener when you're back. In your case, you could try:
1) Do your authentication inside an iframe if possible instead of using redirect.
2) In your case, I see that you need to post the data back to the parent window. You could try this instead:
In your opened window, just store your data and close normally.
var data = {
type : 'complete',
destination : '<?= $destination; ?>'
};
window.hasData = true;
window.data = data;
window.close();
Your parent window has access to your opened window and can handle its close event:
openedWindow.beforeunload = function (){
//here you could access this.data or openedWindow.data because you're on the same domain
if (this.hasData){
}
//Reason we have this check is because the beforeunload event fires whenever the user leaves your page for any reason including close, submit, clicking a link, ...
}
3) A workaround: Use a timer in your parent page to check for the closed property of the openedWindow
setInterval(function(){
if (openedWindow.closed){
}
},1000);
4) Another solution using localStorage as you're on the same domain. You parent page can listen to the event
window.addEventListener("storage", function(event){
}, true);
Your openedWindow code:
var data = {
type : 'complete',
destination : '<?= $destination; ?>'
};
if (localStorage){
localStorage.setItem(JSON.stringify(data));
}
window.close();
Solution 3:
- From your iframe, webpage, on yoursite.com ... open a new window on yoursite.com
- The window redirects itself to Google, Twitter, whatever
- Once done, the OAuth redirect returns the window to a page on yoursite.com
- The new window, because it has the same origin as the page that opened it, can communicate via window.open
Solution 4:
Use localStorage or IndexedDB to communicate between windows that are showing documents from the same domain but which don't have a reference to each other.
Simply have a high-speed timer checking for the data, saving another piece of data to acknowledge receipt and the other window can find it and close.
In short - you use localStorage to pass commands and can even have a library to do this and delete the commands once they are executed, and post the return values.