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I am using FB.getLoginStatus() and FB.Login() to log the user into my website using facebook. I first check for the status on page load using FB.getLoginStatus() and save the state in a hidden variable. When the user clicks on my facebook login button, I first check the value in the hidden variable and call FB.Login() only if FB.getLoginStatus() is not connected. If FB.getLoginStatus() returns 'Connected', then I just log the user into my website without FB.Login().
My scenario with issue *user logs into my accont using facebook *user logs out of my website *my website is open in the logged out state *in another tab, the current facebook user logs out of facebook and a new user logs into facebook *user comes back to my website and clicks on facebook login button without refreshing the page *the old facebook user (not the one currently logged into facebook) is logged into my account
How can I identify the most current user in facebook when user clicks the facebook login button?
<body>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<div id="fb-root">
</div>
<script src="http://connect.facebook.net/en_US/all.js"></script>
<script>
// initialize the library with your Facebook API key
var AppID = '<%=AppID%>';
window.fbAsyncInit = function() {
FB.init({
appId: AppID,
status: true,
cookie: true,
xfbml: true,
channelUrl: 'http://<%=Request.ServerVariables("HTTP_HOST")%>/channel.html'
});
FB.Event.subscribe('auth.login', function(response) {
//alert('logged in');
});
FB.Event.subscribe('auth.logout', function(response) {
//alert('logged out');
});
FB.getLoginStatus(function(response) {
if (response.status === "connected") {
var uid = response.authResponse.userID;
document.getElementById('hdnFBConnected').value = uid;
}
else if (response.status === "not_authorized") {
//alert("Not authorized");
document.getElementById('hdnFBConnected').value = '';
}
else {
//alert("user not logged in to facebook");
document.getElementById('hdnFBConnected').value = '';
}
});
};
</script>
<a href="#" onclick="WindowOpen()"><img src="<%=global_language & "/images/FacebookSmall.gif"%>" /></a>
<script type="text/javascript" language="javascript">
function WindowOpen() {
if (document.getElementById('hdnFBConnected').value != '') //user is connected
{
FB.api('/me', { fields: 'first_name, last_name, locale, email' }, function(result) {
var uid = document.getElementById('hdnFBConnected').value;
//log the user into my site
})
}
else { //user is not connected, so calling FB.Login()
FB.login(function(response) {
if (response.authResponse) {
var access_token = response.authResponse.accessToken;
FB.api('/me', { fields: 'first_name, last_name, locale, email' }, function(result) {
var uid = response.authResponse.userID;
var globalLang = '<%=global_language%>';
//log the user into my site })
}
else {
//alert('User cancelled login or did not fully authorize.');
}
}, { scope: 'email' }
);
}
}
</script>
</body>
What you're describing is normal behavior. The JS SDK is sending the old user's signed_request object which allows the new user to access her account. Since this concerns you, include a logout button on your app's page and let the user know that it's important she clicks that button when she's done using your app. The logout button should call
FB.logoutlike so:For extra security, you can create an activity timer that prompts the user to click a button after X minutes of inactivity. If the user doesn't click within, say 1 minute, she is logged out automatically. This is how most banking sites deal with session security.