CODEWITHSUNDEEP
facebook
Metin METE
Metin METE

Reputation: 55

facebook application link to the problem

i'm trying to prepare an application for Facebook. application software is created. "localhost" tests without any problems but links within the Facebook application is not working... e.g. "page.php?page=test"... application, using the fan page. the first page is opened, UserID and PageID data is seamlessly but i click the link to the sample, the data is blank. i tried to target="_top" but not work...

require 'facebook.php';
$facebook = new Facebook(array(
  'appId'  => 'xxx',
  'secret' => 'xxx',
  'cookie' => false,
));
$signed_request = $_REQUEST["signed_request"];
list($encoded_sig, $payload) = explode('.', $signed_request, 2); 
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
$m2_facebook_kullanici_id = $data['user_id'];
$m2_facebook_sayfa_id = $data['page']['id'];
if(empty($_GET['sayfa'])){
    ...working here USERID and PAGEID...
}
if($_GET['sayfa'] == 'guncelle'){
    ...does not work here USERID and PAGEID...
}

i wonder what's wrong? thank you...

basic solved:

<?php
require 'facebook.php';
$signed_request = $_REQUEST["signed_request"];
$facebook = new Facebook(array(
    'appId'  => 'xxx',
    'secret' => 'xxx',
    'cookie' => false,
));
list($encoded_sig, $payload) = explode('.', $signed_request, 2);
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);

$m2_facebook_kullanici_id = $data['user_id'];
$m2_facebook_sayfa_id = $data['page']['id'];

setcookie("facebook_user_id", $m2_facebook_kullanici_id);
setcookie("facebook_page_id", $m2_facebook_sayfa_id);
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Title</title>
</head>
<body>
<?php
if(empty($_GET['sayfa'])){
    echo '<a href="index.php?sayfa=guncelle">Güncelle</a><br />';
    echo '<h3>Home Page</h3>';
    echo '<strong>User ID:</strong> ' . $m2_facebook_kullanici_id . '<br />';
    echo '<strong>Page ID:</strong> ' . $m2_facebook_sayfa_id;  
}
if($_GET['sayfa'] == 'guncelle'){
    $m2_facebook_kullanici_id = $_COOKIE["facebook_user_id"];
    $m2_facebook_sayfa_id = $_COOKIE["facebook_page_id"];
    echo '<a href="index.php">Back</a><br />';
    echo '<h3>Settings Page</h3>';
    echo '<strong>User ID:</strong> ' . $m2_facebook_kullanici_id . '<br />';
    echo '<strong>Page ID:</strong> ' . $m2_facebook_sayfa_id;  
}
?>
</body>
</html>

Upvotes: 2

Views: 414

Answers (1)

Metin METE
Metin METE

Reputation: 55

SOLUTION:

just add the following code to the end of links

?signed_request=' . $_REQUEST['signed_request'] . '

or

&amp;signed_request=' . $_REQUEST['signed_request'] . '

a simple example of the application

<?php
require 'facebook.php';
function parse_signed_request($signed_request, $secret) {
  list($encoded_sig, $payload) = explode('.', $signed_request, 2); 
  $sig = base64_url_decode($encoded_sig);
  $data = json_decode(base64_url_decode($payload), true);
  if (strtoupper($data['algorithm']) !== 'HMAC-SHA256') {
    error_log('Unknown algorithm. Expected HMAC-SHA256');
    return null;
  }
  $expected_sig = hash_hmac('sha256', $payload, $secret, $raw = true);
  if ($sig !== $expected_sig) {
    error_log('Bad Signed JSON signature!');
    return null;
  }
  return $data;
}
function base64_url_decode($input) {
  return base64_decode(strtr($input, '-_', '+/'));
}
$data = parse_signed_request($_REQUEST['signed_request'], 'a5aaf146542d50c11f55e001c0fb8f31');

$m2_facebook_kullanici_id = $data['user_id'];
$m2_facebook_sayfa_id = $data['page']['id'];
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Title</title>
</head>
<body>
<?php
if(empty($_GET['sayfa'])){
    echo '<a href="app_fan_page.php?sayfa=guncelle&amp;signed_request='.$_REQUEST['signed_request'].'">Settings</a><br />';
    echo '<h3>Home</h3>';
    echo '<strong>User ID:</strong> ' . $m2_facebook_kullanici_id . '<br />';
    echo '<strong>Page ID:</strong> ' . $m2_facebook_sayfa_id;
}
if($_GET['sayfa'] == 'guncelle'){
    echo '<a href="app_fan_page.php?signed_request=' . $_REQUEST['signed_request'] . '">Home</a><br />';
    echo '<h3>Settings</h3>';
    echo '<strong>User ID:</strong> ' . $m2_facebook_kullanici_id . '<br />';
    echo '<strong>Page ID:</strong> ' . $m2_facebook_sayfa_id;  
}
?>
</body>
</html>

special thank: moguzalp and Mesut Eyrice

Upvotes: 2

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