http://wiki.developers.facebook.com/index.php/Trying_Out_Facebook_Connect
FaceBook Connect is used to quickly integrate your site with Facebook account.
I look into http://www.somethingtoputhere.com/therunaround/index.php demo site using FackBook Connect, and come to some results:
1. Click “Connect with FaceBook” button, a popup window appears.
It’s a page of FaceBook: http://www.connect.facebook.com/login.php
2. Login to FaceBook use your account, the result is:
<html><head><title>Redirecting…</title><meta http-equiv=”refresh” content=”0;url=http://www.somethingtoputhere.com/therunaround/xd_receiver.php?fb_login&fname=_opener&session=%7B%22session_key%22%3A%223.TaTfPjET3u……” /></head><body></body></html>
3. The page is redirect to
http://www.somethingtoputhere.com/therunaround/xd_receiver.php, the user session is passed in.
Let’s look at the JavaScript file contains in the xd_receiver.php.
I have modify the js file to show the main logic:
var pathname = document.URL;
hashIndex = pathname.indexOf('fb_login&');
hash = pathname.substring(hashIndex + 9);
var packetStart = hash.indexOf('&');
// "_opener"
var frame_name = hash.substr(6, packetStart-6);
if(frame_name == "_opener") {
hostWindow = hostWindow.opener;
}
// "%7B%22session_key%22%3A%223.TaTfPjET3u......"
packet_string = hash.substr(packetStart+1);
hostWindow.FB.XdComm.Server.singleton.onReceiverLoaded(packet_string);4. Now your site receive the FaceBook account identification.
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