javascript - How do I get around window.opener cross-domain security

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javascript - How do I get around window.opener cross-domain security

posted Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

javascript - 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.

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1 Reply

深蓝 · Answer 1 · 2021-10-16T22:35:22+0000

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.

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