Facebook API：使用JavaScript SDK登錄，然后使用PHP檢查登錄狀態

Question

當用戶單擊“登錄”按鈕時，我正在使用Facebook的JavaScript SDK彈出“登錄彈出窗口”。

正如Facebook在文檔中提供的那樣，代碼是：

$(".loginButton").click(function(){
 FB.login(function(response) {
    FB.api('/me', function(response) {
       console.log(response.id);
       //User ID shows up so I can see that the user has accepted the app.
     });
 });

我還可以使用FB.getLoginStatus()來檢查用戶是否確實已登錄並接受了該應用程序。

但是，現在我想用PHP執行一個函數。 據我了解，PHP具有$user ，在成功登錄后會為其分配UserID。

問題是在JS Login $user仍然為0 。 我被卡住了，無法弄清楚為什么它不能為$user分配正確的用戶ID。

這是我的JS：

    <script type="text/javascript">  

        window.fbAsyncInit = function() {
            FB.init({
                appId  : '<?php echo $AppId; ?>',
                status : true, // check login status
                cookie : true, // enable cookies to allow the server to access the session
                xfbml  : true,
                channelUrl  : '<?php echo $ServerPath; ?>channel.php' // custom channel
            });

    }; 


    //Get Login Status
    function amILoggedIn(){
        var toreturn = "";
        FB.getLoginStatus(function(response) {
            if (response.status === 'connected') {
                window.userId =  response.authResponse.userID;
            toreturn = "GetLoginStatus: logged in" + " " + "<?php echo $user; ?>";
            } else {
            toreturn = "GetLoginStatus: Logged Out";
            }
            console.log(toreturn);
        }); 


    };


    // Load the SDK asynchronously
    (function(d, s, id){
         var js, fjs = d.getElementsByTagName(s)[0];
         if (d.getElementById(id)) {return;}
         js = d.createElement(s); js.id = id;
         js.src = "//connect.facebook.net/en_US/all.js";
         fjs.parentNode.insertBefore(js, fjs);
       }(document, 'script', 'facebook-jssdk'));

            var obj = {
                    method: 'feed',
                    link: 'http://www.google.com'
                };


    $(".loginPopupButton").click(function(){
         FB.login(function(response) {
            FB.api('/me', function(response) { //user-specific stuff
               console.log(response.id);
             });
         });

    });

    </script>

這是PHP：

    <?php
    include_once('fbapi/facebook.php');
    include_once('fbapi/Authenticated_User.php');
    include_once('config.php');


    // Create our Application instance.
    $facebook = new Facebook(array(
                    'appId'  => $AppId,
                    'secret' => $AppSecret
                ));
    //Facebook Authentication part
    $user = $facebook->getUser();


    $perms = "manage_pages";
    if(isset($_GET['backlink']))
        $redirectUrl   = urldecode($_GET['backlink']);
    else
        $redirectUrl   = $fullserverpath;

    $cancelUrl   = $ServerPath."index.php?page=loginWFb";

    //AA - where to go to get FB popup.    
    $loginUrl = $facebook->getLoginUrl(
            array(
                'scope' => $perms,
                'redirect_uri' => $redirectUrl,
                'cancel_uri' => $cancelUrl
            )
    );



    //AA- Defining that a powerUSER is someone who's logged in
    if(isset($user)){
        $_SESSION['loggedIn'] = $user;

    }

    ?>

Answer 1

使用JS SDK登錄將登錄數據存儲在Facebook cookie中，而使用PHP SDK登錄將數據存儲在PHP會話中。 因此，如果您使用JS SDK登錄，PHP SDK將不會意識到這一點。

要使用JS SDK數據登錄PHP SDK，您需要使用查詢參數中帶有簽名的請求來調用PHP頁面：

FB.getLoginStatus(function(response) {
    if (response.status === 'connected') {
        // Full redirect or ajax request according to your needs
        window.location.href = 'login.php?signed_request='+response.authResponse.signedRequest;
    }
});

然后$facebook->getUser()將在您的PHP代碼中提供用戶ID。

Answer 2

在PHP中初始化Facebook對象時，請嘗試將sharedSession參數設置為true ：

$facebook = new Facebook(array(
    'appId'         => $AppId,
    'secret'        => $AppSecret,
    'sharedSession' => true
));

Answer 3

您可以從這里找到工作示例

http://liferaypower.blogspot.com/2013/10/index.html

樣例代碼

FB.init({
    appId: '490986011016528', // App ID

    channelUrl: 'http://localhost:8000/', // Channel File

    status: true, // check login status

    cookie: true, // enable cookies to allow the server to access session

    xfbml: true  // parse XFBML

});

FB.Event.subscribe('auth.authResponseChange', function(response) 
{

    if (response.status === 'connected') 
    {

       document.getElementById("message").innerHTML +=  "ConnectedtoFacebook";
 }  
 else if (response.status === 'not_authorized') 
 {

document.getElementById("message").innerHTML +=  "<br>Failed to Connect";
   //FAILED

 }

else 
  {

    document.getElementById("message").innerHTML +=  "<br>Logged Out";
      //UNKNOWN ERROR

   }
});