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plurals

PO
primarykey
Id
7712807
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
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1
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CreationDate
2011-10-10T12:33:11.860
FavoriteCount
0
LastActivityDate
2011-10-10T12:33:11.860
LastEditDate
LastEditorUserId
0
OwnerUserId
834168
ParentId
7710695
PostTypeId
2
Score
5
ViewCount
0
LastEditorDisplayName
text
Body
<p>In order to know whether user already authenticated your app or not, decode signed_request and check if oauth_token is passed:</p> <pre><code><?php $secret='APP_SECRET'; $signed_request=($_REQUEST['signed_request']); function parse_signed_request($signed_request, $secret) { list($encoded_sig, $payload) = explode('.', $signed_request, 2); // decode the data $sig = base64_url_decode($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;} // check signature $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, '-_', '+/')); } $information=parse_signed_request($signed_request, $secret); $oauth_token=$information["oauth_token"]; ?> </code></pre> <p>Then, use this script to get user authenticated if $oauth_token is empty:</p> <pre><code> <?php $app_id = "APP_ID"; $canvas_page = "YOUR_TAB_URL"; $auth_url = "http://www.facebook.com/dialog/oauth?client_id=" . $app_id . "&redirect_uri=" . urlencode($canvas_page) . "&scope=ENTER WANTED PERMISSIONS HERE"; $signed_request = $_REQUEST["signed_request"]; list($encoded_sig, $payload) = explode('.', $signed_request, 2); $data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true); if (empty($oauth_token)) {echo("<script> top.location.href='" . $auth_url . "'</script>");} ?> </code></pre> <p>Fill in APP_SECRET, APP_ID, YOUR_TAB_URL and WANTED PERMISSIONS in these scripts, cheers.</p>
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1. POHow do I authorize the user in a facebook pages tab?
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1. COThank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, ...! :)
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