【发布时间】：2015-03-04 12:18:58
【问题描述】：
我已经使用 Facebook PHP 和 JS API 创建了一个页面。
首先，用户必须进行身份验证（login.php）。然后将用户重定向到 index.php。这很好用，但是如果用户导航到另一个页面或在页面加载之前重新加载页面，它将再次将用户返回到 login.php 进行身份验证。 （这是因为 $session 中的 if/else）。如果没有 $session 并记录异常，我关闭重定向以登录时，我收到此错误：
exception 'Facebook\FacebookAuthorizationException' with message 'This authorization code has been used.' in /Applications/XAMPP/xamppfiles/htdocs/ntsosial/fb/src/Facebook/FacebookRequestException.php:104 Stack trace: #0 /Applications/XAMPP/xamppfiles/htdocs/ntsosial/fb/src/Facebook/FacebookRequest.php(280): Facebook\FacebookRequestException::create('{"error":{"mess...', Object(stdClass), 400) #1 /Applications/XAMPP/xamppfiles/htdocs/ntsosial/fb/src/Facebook/Entities/AccessToken.php(328): Facebook\FacebookRequest->execute() #2 /Applications/XAMPP/xamppfiles/htdocs/ntsosial/fb/src/Facebook/Entities/AccessToken.php(242): Facebook\Entities\AccessToken::request('/oauth/access_t...', Array, NULL, NULL) #3 /Applications/XAMPP/xamppfiles/htdocs/ntsosial/fb/src/Facebook/Entities/AccessToken.php(187): Facebook\Entities\AccessToken::requestAccessToken(Array, NULL, NULL) #4 /Applications/XAMPP/xamppfiles/htdocs/ntsosial/fb/src/Facebook/FacebookSession.php(271): Facebook\Entities\AccessToken::getAccessTokenFromCode('AQCcnkOOMQ9l2Qk...') #5 /Applications/XAMPP/xamppfiles/htdocs/ntsosial/fb/src/Facebook/FacebookSession.php(252): Facebook\FacebookSession::newSessionAfterValidation(Object(Facebook\Entities\SignedRequest)) #6 /Applications/XAMPP/xamppfiles/htdocs/ntsosial/fb/src/Facebook/FacebookSignedRequestFromInputHelper.php(93): Facebook\FacebookSession::newSessionFromSignedRequest(Object(Facebook\Entities\SignedRequest)) #7 /Applications/XAMPP/xamppfiles/htdocs/ntsosial/db/FbAuth.php(19): Facebook\FacebookSignedRequestFromInputHelper->getSession() #8 /Applications/XAMPP/xamppfiles/htdocs/ntsosial/pages/index.php(3): require('/Applications/X...') #9 {main}
Notice: Undefined variable: session in /Applications/XAMPP/xamppfiles/htdocs/ntsosial/db/FbAuth.php on line 28
我的文件（已删除的 CSS 和内容）：
index.php:
<?php
require '../db/FbAuth.php';
?>
<!DOCTYPE html>
<html lang="en">
<head>
<script>
// This is called with the results from from FB.getLoginStatus().
function statusChangeCallback(response) {
console.log('statusChangeCallback');
console.log(response);
// The response object is returned with a status field that lets the
// app know the current login status of the person.
// Full docs on the response object can be found in the documentation
// for FB.getLoginStatus().
if (response.status === 'connected') {
// Logged into your app and Facebook.
} else if (response.status === 'not_authorized') {
// The person is logged into Facebook, but not your app.
console.log("Not authorized. Redirecting ..");
window.location = "login.php";
} else {
// The person is not logged into Facebook, so we're not sure if
// they are logged into this app or not.
console.log("Not logged in to FB. Redirecting..");
window.location = "login.php";
}
}
// This function is called when someone finishes with the Login
// Button. See the onlogin handler attached to it in the sample
// code below.
function checkLoginState() {
FB.getLoginStatus(function(response) {
statusChangeCallback(response);
});
}
window.fbAsyncInit = function() {
FB.init({
appId : 'removed',
cookie : true, // enable cookies to allow the server to access
// the session
xfbml : true, // parse social plugins on this page
version : 'v2.1' // use version 2.1
});
// Now that we've initialized the JavaScript SDK, we call
// FB.getLoginStatus(). This function gets the state of the
// person visiting this page and can return one of three states to
// the callback you provide. They can be:
//
// 1. Logged into your app ('connected')
// 2. Logged into Facebook, but not your app ('not_authorized')
// 3. Not logged into Facebook and can't tell if they are logged into
// your app or not.
//
// These three cases are handled in the callback function.
FB.getLoginStatus(function(response) {
statusChangeCallback(response);
});
FB.Event.subscribe('auth.authResponseChange', function(response) {
if (response.status !== 'connected') {
window.top.location = 'login.php';
}
});
};
// 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/nb_NO/sdk.js";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
// Logging user out
function logout() {
console.log("Signing out");
FB.logout(function(response) {
// user is now logged out
console.log("Signed out");
});
}
</script>
</head>
<body>
</body>
</html>
db/FbAuth.php
<?php
require '../fb/autoload.php';
use Facebook\FacebookSession;
use Facebook\FacebookRequest;
use Facebook\FacebookJavaScriptLoginHelper;
use Facebook\GraphUser;
use Facebook\FacebookRequestException;
// Initialize the Facebook SDK.
FacebookSession::setDefaultApplication('removed','removed');
$helper = new FacebookJavaScriptLoginHelper();
try {
$session = $helper->getSession();
} catch(FacebookRequestException $ex) {
// When Facebook returns an error
} catch(\Exception $ex) {
// When validation fails or other local issues
}
if ($session) {
try {
$me = (new FacebookRequest(
$session, 'GET', '/me'
))->execute()->getGraphObject(GraphUser::className());
$userID = $me->getId();
} catch (FacebookRequestException $e) {
// The Graph API returned an error
} catch (\Exception $e) {
// Some other error occurred
}
}
else {
header("Location: ../pages/login.php");
die();
}
?>
我正在使用 FB PHP SDK v4 和 JS SDK v2.1。
这是因为 JavaScript 没有完成吗？我怎样才能避免这种情况？
【问题讨论】：
标签： javascript php facebook facebook-graph-api