php - Facebook PHP/JS SDK“会话已在 unix 时间过期”，具有长寿命令牌

Question

我正在尝试使用存储的长寿命访问令牌，但 2 小时后我从图形 API 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，它工作得很好，除了在每个后续页面请求中都会发生这种情况，Facebook 继续使我的访问令牌无效，并出现以下错误，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.

完整的测试页示例如下。出于明显的原因省略了我的密钥。点击页面，登录，然后离开几个小时，然后再次点击页面（您将重定向到 facebook 并返回 url 中的代码），重新加载页面，它将继续重定向到 facebook 并返回, 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>

我究竟做错了什么？或者这是 Facebook 的问题？

更新：

我已经更新了我的代码以遵循@cpilko 发布的流程，但是我仍然遇到同样的问题。我可以很好地登录和退出。但是，如果我在几个小时后访问测试页面，比如说第二天我使用提供的长寿命访问令牌（FB JS SDK 认为我已连接，但服务器没有），我得到了 Session expired 异常，我刷新页面并我显示为服务器和 FB JS SDK 都已登录，并且我从 facebook 获得的长寿令牌与我最初尝试的令牌相同（存储在我的 cookie 中）。我不明白的是为什么我第一次无法使用长寿令牌。更新了下面的代码。

<?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>

score 4 · Accepted Answer

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令牌重新填充您的 cookie。

您遇到的另一个问题是在进行 api 调用之前，您正在用短期访问令牌覆盖长期访问令牌：

// 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：$access_token_temp这样$access_token_long我就可以保持直截了当。

编辑

您的页面加载工作流程需要：

+ 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.

你已经在你的代码中得到了所有的部分。您只需要清理逻辑以使其工作。

编辑#2：

我在我的服务器上运行了你的代码。它主要工作，但您输出的调试信息过早地发送标头，抑制setcookie()设置 cookie 的能力。

我通过$out = array();在开头声明附近运行您的代码，然后将您的所有echo和print语句更改$out[] = "What you were echoing or printing before";为仍显示此内容，请echo implode("\n", $out);在<body>您的文档中添加。

一旦我这样做了，我就能够在 cookie 中存储一个有效的令牌，并验证它确实是一个有效期为 60 天的长寿命令牌。

score 0 · Accepted Answer

看起来 FB 正在劝阻我们不要为更长的令牌进行服务器交换：

回复：桌面应用程序：“但是，如果不让用户再次登录到您的应用程序，就无法获得长期用户 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？我已经设置了离线访问令牌，并进行了刷新-尽管它涉及用户重新单击以刷新（不是自动的）。

另外-您可以很容易地进行图形调用

$facebook->api("me"); // no need to add access token, or decode JSON, etc.

php - Facebook PHP/JS SDK“会话已在 unix 时间过期”，具有长寿命令牌

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