无法获得Facebook访问令牌 - Not able to obtain Facebook access token

我有两个页面，facebook.php和generatePageToken.php我试图张贴作为页面到我的facebook页面，但这个脚本目前只张贴作为管理员。在facebook.php页面我尝试获得一个访问令牌，但它不工作-它提醒回空白。请不要告诉我去读一些API，我已经读过了，我真的不明白这有什么问题。理想情况下，我想要一个永久的令牌，如果有人可以挥舞它

facebook.php

<!doctype html>
<html>
<head>
        <script type="text/javascript">
        function SendToFacebook()
        {
            window.fbAsyncInit = function () {
                // init the FB JS SDK
                FB.init({
                    appId: '432036336937975',                        // App ID from the app dashboard
                    status: false,                                 // Check Facebook Login status
                    xfbml: true                                  // Look for social plugins on the page
                });

                FB.login(function (response) {
                    FB.api('/me/accounts', function (apiresponse) {
if (response.authResponse) {
        //simple user access token
        var accessToken = response.authResponse.accessToken,
            ajaxRequest = new XMLHttpRequest(),
            pageId = '1521533601413118';
        ajaxRequest.onreadystatechange = function() {
            if(ajaxRequest.readyState === 4) {
                //print out the extended page access token
                alert(ajaxRequest.responseText);
            }
        };
        ajaxRequest.open('POST','generatePageToken.php?pageId=' + pageId, true);
        ajaxRequest.setRequestHeader('Content-type','application/x-www-form-urlencoded');
        ajaxRequest.send('accessToken=' + accessToken);
    }
                        var data = {
                            message: "mymessage test",
                            display: 'iframe',
                            caption: "caption",
                            name: "name",
                            description: "description",
                            to: '1521533601413118',
                            from: '1521533601413118'
                        };
                        FB.api('/1521533601413118/feed', 'post', data, function () {
                            console.log(arguments);
                        });

                    });
                }, { scope: 'manage_pages'});
            };
            // 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'));
        }
        </script>
</head>
<body>
<a href="#" onclick="SendToFacebook();">Submit</a>
</body>
</html>

generatePageToken.php

<?php
$accessToken = $_GET['accessToken'];
$pageId = $_POST['pageId'];
$fbAppId = '432036336937975';
$fbAppSecret = 'REMOVED FOR NOW';
$appsecretProof = hash_hmac('sha256', $accessToken, $fbAppSecret);
//init curl
$ch = curl_init();
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
curl_setopt($ch, CURLOPT_TIMEOUT, 60);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_USERAGENT, 'facebook-php-3.2');
//get extended user access token
$url = 'https://graph.facebook.com/oauth/access_token?grant_type=fb_exchange_token' .
    '&client_id=' . $fbAppId .
    '&client_secret=' . $fbAppSecret .
    '&fb_exchange_token=' . $accessToken .
    '&appsecret_proof=' . $appsecretProof;
curl_setopt($ch, CURLOPT_URL, $url);
$curlResult = curl_exec($ch);
$response_params = array();
parse_str($curlResult, $response_params);
$extendedUserToken = $response_params['access_token'];
$appsecretProof = hash_hmac('sha256', $extendedUserToken, $fbAppSecret);
//get extended page access token
$url = 'https://graph.facebook.com/' . $pageId .
    '?fields=access_token' .
    '&access_token=' . $extendedUserToken .
    '&appsecret_proof=' . $appsecretProof;
curl_setopt($ch, CURLOPT_URL, $url);
$curlResult = curl_exec($ch);
curl_close($ch);
$pageToken = json_decode($curlResult)->access_token;
echo $pageToken;
?>

我想是因为你把$_POST和$_GET弄混了:

代码:

ajaxRequest.open('POST','generatePageToken.php?pageId=' + pageId, true);
                                               ^ pageId is GET
ajaxRequest.setRequestHeader('Content-type','application/x-www-form-urlencoded');
ajaxRequest.send('accessToken=' + accessToken);
                  ^ accessToken is POST

您正在发送pageId作为GET变量，而accessToken是POST变量。

然而，您的PHP检索变量为:

$accessToken = $_GET['accessToken'];
$pageId = $_POST['pageId'];

应该是相反的，例如:

$accessToken = $_POST['accessToken'];
$pageId = $_GET['pageId'];

如果你想作为页面的用户在你的页面上发帖，你需要首先改变你的权限范围:

你需要}, { scope: 'manage_pages, publish_stream'});，(添加的publish_stream)。

现在，它很容易发布，只需发送一个post请求:

$data = http_build_query(array(
    'access_token'  => **your access token**,
    'message'       => 'hello world!'
));
$ch=curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://graph.facebook.com/v2.1/1521533601413118/feed');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
$response = curl_exec($ch);
curl_close($ch);