我正在尝试使用存储的长期访问令牌，但在2小时后，我从图API中收到以下错误。我已经编写了一些代码来将用户发送到Facebook以获取可以交换访问令牌的新代码，除了在每个后续页面请求中发生这种情况之外，其工作正常，Facebook继续使用以下错误使我的访问令牌无效，尽管他们的服务器返回了访问令牌。
Error validating access token: Session has expired at unix time 1338300000. The current unix time is 1338369365.
完整的测试页面示例如下。由于显而易见的原因省略了我的钥匙。点击页面，登录，然后离开它几个小时再次点击页面（你将重定向到Facebook并返回到网址中的代码），重新加载页面，它将继续重定向到Facebook然后回来，事件虽然我告诉它使用它刚刚为所述代码返回的访问令牌。
<?php
require 'facebook.php';
$app_id = APP_ID;
$app_secret = APP_SERCRET;
$my_url = URL;
$facebook = new Facebook(array(
'appId' => $app_id,
'secret' => $app_secret
));
// known valid access token stored in a database
$access_token = isset($_COOKIE["FB_LONG_AC_TOKEN"]) ? $_COOKIE["FB_LONG_AC_TOKEN"] : false;
$code = $_REQUEST["code"];
// If we get a code, it means that we have re-authed the user
//and can get a valid access_token.
if (isset($code)) {
$token_url="https://graph.facebook.com/oauth/access_token?client_id="
. $app_id . "&redirect_uri=" . urlencode($my_url)
. "&client_secret=" . $app_secret
. "&code=" . $code . "&display=popup";
$response = file_get_contents($token_url);
$params = null;
parse_str($response, $params);
$access_token = $params['access_token'];
}
// Attempt to query the graph:
$graph_url = "https://graph.facebook.com/me?"
. "access_token=" . $access_token;
$response = curl_get_file_contents($graph_url);
$decoded_response = json_decode($response);
//Check for errors
if ($decoded_response->error) {
// check to see if this is an oAuth error:
if ($decoded_response->error->type== "OAuthException") {
// Retrieving a valid access token.
$dialog_url= "https://www.facebook.com/dialog/oauth?"
. "client_id=" . $app_id
. "&redirect_uri=" . urlencode($my_url);
echo("<script> top.location.href='" . $dialog_url
. "'</script>");
}
else {
echo "other error has happened";
}
}
else {
// success
echo("Success: ".$decoded_response->name."<br />");
echo($access_token."<br />");
// Attempt to convert access token to longlife token if we don't have one stored.
if (!isset($_COOKIE["FB_LONG_AC_TOKEN"]))
{ // don't have long life token, so let's get one.
$ch = curl_init("https://graph.facebook.com/oauth/access_token?client_id=".$app_id."&client_secret=".$app_secret."&grant_type=fb_exchange_token&fb_exchange_token=".$access_token);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
$data = curl_exec($ch);
curl_close($ch);
$params = null;
parse_str($data, $params);
if (isset($params["access_token"]))
{
$access_token = $params["access_token"];
echo("Got long life token.<br />");
setcookie("FB_LONG_AC_TOKEN", $access_token, time() + (3600 * 24 * 60), "/");
}
}
else {
echo("Have long life token already.<br />");
}
}
if ($access_token) {
$facebook->setAccessToken($access_token);
// See if there is a user from a cookie
$user = $facebook->getUser();
if ($user) {
try {
// Proceed knowing you have a logged in user who's authenticated.
$user_profile = $facebook->api('/me');
} catch (FacebookApiException $e) {
echo '<pre>'.htmlspecialchars(print_r($e, true)).'</pre>';
$user = null;
}
}
}
// note this wrapper function exists in order to circumvent PHP’s
//strict obeying of HTTP error codes. In this case, Facebook
//returns error code 400 which PHP obeys and wipes out
//the response.
function curl_get_file_contents($URL) {
$c = curl_init();
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($c, CURLOPT_URL, $URL);
$contents = curl_exec($c);
$err = curl_getinfo($c,CURLINFO_HTTP_CODE);
curl_close($c);
if ($contents) return $contents;
else return FALSE;
}
?>
<!doctype html>
<html xmlns:fb="http://www.facebook.com/2008/fbml">
<head>
<title>Facebook Auth</title>
</head>
<body>
<?php if ($user) { ?>
Your user profile is
<pre>
<?php print htmlspecialchars(print_r($user_profile, true)) ?>
</pre>
<?php } else { ?>
<fb:login-button></fb:login-button>
<?php } ?>
<div id="fb-root"></div>
<script>
window.fbAsyncInit = function () {
FB.init({
appId: <?php echo($app_id); ?>,
cookie: true, // enable cookies to allow the server to access the session
oauth: true, // enable OAuth 2.0
xfbml: true // parse XFBML
});
FB.getLoginStatus(function (res) {
console.log(res.status);
});
};
(function(d){
var js, id = 'facebook-jssdk'; if (d.getElementById(id)) {return;}
js = d.createElement('script'); js.id = id; js.async = true;
js.src = "//connect.facebook.net/en_US/all.js";
d.getElementsByTagName('head')[0].appendChild(js);
}(document));
</script>
</body>
</html>
我做错了什么？或者这是Facebook的问题？
更新
我已更新我的代码以遵循@cpilko发布的流程但是我仍然遇到同样的问题。我可以登录和退出就好了。但是，如果我在几个小时后访问测试页面，请说第二天我使用提供的长寿命访问令牌获取Session过期异常（FB JS SDK认为我已连接，但服务器没有），我刷新页面我被显示为由服务器和FB JS SDK登录，我从facebook获得的长寿命令牌与我原来尝试过的（存储在我的cookie中）相同。我不明白的是为什么我第一次无法使用长寿命令牌。更新了以下代码。
<?php
require 'facebook.php';
$app_id = "XXXXXXXXXXXXX";
$app_secret = "XXXXXXXXXXXXXXXXXXXX";
$my_url = "http://swan.magicseaweed.local/facebook/";
$facebook = new Facebook(array(
'appId' => $app_id,
'secret' => $app_secret
));
$valid_user = false;
var_dump($_COOKIE);
echo("<br />");
if (isset($_COOKIE["FB_LONG_AC_TOKEN"]))
{ // Have long term token, attempt to validate.
// Attempt to query the graph:
$graph_url = "https://graph.facebook.com/me?"
. "access_token=" . $_COOKIE["FB_LONG_AC_TOKEN"];
$response = curl_get_file_contents($graph_url);
$decoded_response = json_decode($response);
// If we don't have an error then it's valid.
if (!$decoded_response->error) {
$valid_user = true;
$access_token = $_COOKIE["FB_LONG_AC_TOKEN"];
echo("Have long life token.<br />");
}
else {
// Stored token is invalid.
// Attempt to renew token.
// Exchange short term token for long term.
$ch = curl_init("https://graph.facebook.com/oauth/access_token?client_id=".$app_id."&client_secret=".$app_secret."&grant_type=fb_exchange_token&fb_exchange_token=".$facebook->getAccessToken());
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
$data = curl_exec($ch);
curl_close($ch);
$params = null;
parse_str($data, $params);
if (isset($params["access_token"]))
{
$access_token = $params["access_token"];
echo("Got long life token.<br />");
setcookie("FB_LONG_AC_TOKEN", $access_token, time() + (3600 * 24 * 60), "/");
}
else
{ // Clear invalid token.
setcookie("FB_LONG_AC_TOKEN", "false", time() - 3600, "/");
echo("Long life token invalid.<br />");
}
}
}
else if ($facebook->getUser())
{ // Have short term access token.
// Verify short term token is valid still.
try {
// Proceed knowing you have a logged in user who's authenticated.
$user_profile = $facebook->api('/me');
}
catch (FacebookApiException $e) { }
if (is_array($user_profile)) { // Have user.
$valid_user = true;
// Exchange short term token for long term.
$ch = curl_init("https://graph.facebook.com/oauth/access_token?client_id=".$app_id."&client_secret=".$app_secret."&grant_type=fb_exchange_token&fb_exchange_token=".$facebook->getAccessToken());
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
$data = curl_exec($ch);
curl_close($ch);
$params = null;
parse_str($data, $params);
if (isset($params["access_token"]))
{
$access_token = $params["access_token"];
echo("Got long life token.<br />");
setcookie("FB_LONG_AC_TOKEN", $access_token, time() + (3600 * 24 * 60), "/");
}
}
}
if ($access_token) {
$facebook->setAccessToken($access_token);
// See if there is a user from a cookie
$user = $facebook->getUser();
if ($user) {
try {
// Proceed knowing you have a logged in user who's authenticated.
$user_profile = $facebook->api('/me');
} catch (FacebookApiException $e) {
echo '<pre>'.htmlspecialchars(print_r($e, true)).'</pre>';
$user = null;
}
}
}
// note this wrapper function exists in order to circumvent PHP’s
//strict obeying of HTTP error codes. In this case, Facebook
//returns error code 400 which PHP obeys and wipes out
//the response.
function curl_get_file_contents($URL) {
$c = curl_init();
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($c, CURLOPT_URL, $URL);
$contents = curl_exec($c);
$err = curl_getinfo($c,CURLINFO_HTTP_CODE);
curl_close($c);
if ($contents) return $contents;
else return FALSE;
}
?>
<!doctype html>
<html xmlns:fb="http://www.facebook.com/2008/fbml">
<head>
<title>Facebook Auth</title>
</head>
<body>
<?php if ($user) { ?>
Your user profile is
<pre>
<?php print htmlspecialchars(print_r($user_profile, true)) ?>
</pre>
<?php } else { ?>
<fb:login-button></fb:login-button>
<?php } ?>
<div id="fb-root"></div>
<script>
window.fbAsyncInit = function () {
FB.init({
appId: <?php echo($app_id); ?>,
cookie: true, // enable cookies to allow the server to access the session
oauth: true, // enable OAuth 2.0
xfbml: true // parse XFBML
});
FB.getLoginStatus(function (res) {
console.log(res.status);
});
};
(function(d){
var js, id = 'facebook-jssdk'; if (d.getElementById(id)) {return;}
js = d.createElement('script'); js.id = id; js.async = true;
js.src = "//connect.facebook.net/en_US/all.js";
d.getElementsByTagName('head')[0].appendChild(js);
}(document));
</script>
</body>
</html>
答案 0 :(得分：4)
当您的原始令牌过期时，您陷入循环的原因是您的代码不允许Facebook为您提供新令牌。当您收到OAuth错误时，您正在调用OAuth对话框，该对话框不会使用新标记重新填充您的Cookie。
你遇到的另一个问题是你在拨打api电话之前用你的短期访问令牌覆盖了长期访问令牌：
// known valid access token stored in a database
$access_token = isset($_COOKIE["FB_LONG_AC_TOKEN"]) ? $_COOKIE["FB_LONG_AC_TOKEN"] : false;
...
if ($access_token) {
$facebook->setAccessToken($access_token); //Loads the short-term token from a cookie!
如果是我的代码，我会使用两个变量：$access_token_temp和$access_token_long，这样我就可以保持正确。
修改
您在页面加载时的工作流程必须是：
+ IF one exists, retrieve the long-term token from `$_COOKIE['FB_LONG_AC_TOKEN']`
+ If it does exist, test to see if it is valid.
+ If valid, use the renew the token and update the cookie if one is returned. (Only one token will be returned per day)
+ Else mark the long-term token as invalid and clear the cookie.
+ Set a `$vaild_user` flag.
+ ELSE IF a new short-term token is available
+ Read the short-term token cookie with the PHP API and exchange this for a long-term token.
+ Store the long-term token in the cookie
+ Clear the short-term token cookie
+ Set a `$valid_user` flag
+ ELSE: The token does not exist or is invalid
+ Redirect the user to the JS API auth dialog and store the returned short term token in a cookie.
+ Reload the page to process this.
+ ENDIF
+ IF `$valid_user`: Do stuff.
您的代码中包含所有部分。您只需要清理逻辑以使其正常工作。
编辑＃2：
我在我的服务器上运行了你的代码。它主要起作用，但是您输出的调试信息过早地发送标头，从而阻碍了setcookie()设置cookie的能力。
我通过在开头附近声明$out = array();来运行您的代码，然后将所有echo和print语句更改为$out[] = "What you were echoing or printing before";要仍显示此内容，请添加{ {1}}在您文档的echo implode("\n", $out);内。
一旦我这样做，我就能够在cookie中存储有效的令牌，validate它确实是一个长期令牌，有60天的到期时间。
答案 1 :(得分：0)
看起来FB正在阻止我们为更长的代币进行服务器交换：
Re：桌面应用：“但是，如果没有用户再次登录您的应用，就无法获得长期存在的用户access_token。” https://developers.facebook.com/roadmap/offline-access-removal/
您是否检查过服务器上的时区设置？我已经设置了offline_access令牌，并进行了刷新 - 虽然它涉及用户重新点击刷新（不是自动）。
此外 - 您可以使用
轻松进行图表调用$facebook->api("me"); // no need to add access token, or decode JSON, etc.