How to avoid fatal error: Uncaught OAuthException when using cron job - oauth

Question

Hi hope somone can help with this one. Ive had a birthday reminder app built, that aquires the usual permissions including offline access etc.
The app requires a daily cron job to be run on my server.
When I run the cron file a recieve the below error
Fatal error: Uncaught OAuthException: Invalid OAuth access token signature. thrown in blah/base_facebook.php on line 1140;
Is there a common reason for the error, am i doing anything wrong that stands out, and should i be displaying more code to get help from people?
below are the lines leading up to the error. My code ends on line 1140;
<?php
$name = 'api';
if (isset($READ_ONLY_CALLS[strtolower($method)])) {
$name = 'api_read';
} else if (strtolower($method) == 'video.upload') {
$name = 'api_video';
}
return self::getUrl($name, 'restserver.php');
}
protected function getUrl($name, $path='', $params=array())
{
$url = self::$DOMAIN_MAP[$name];
if ($path) {
if ($path[0] === '/') {
$path = substr($path, 1);
}
$url .= $path;
}
if ($params) {
$url .= '?' . http_build_query($params, null, '&');
}
return $url;
}
protected function getCurrentUrl() {
if (isset($_SERVER['HTTPS']) &&
($_SERVER['HTTPS'] == 'on' || $_SERVER['HTTPS'] == 1) ||
isset($_SERVER['HTTP_X_FORWARDED_PROTO']) &&
$_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
$protocol = 'https://';
}
else {
$protocol = 'http://';
}
$currentUrl = $protocol . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
$parts = parse_url($currentUrl);
$query = '';
if (!empty($parts['query'])) {
// drop known fb params
$params = explode('&', $parts['query']);
$retained_params = array();
foreach ($params as $param) {
if ($this->shouldRetainParam($param)) {
$retained_params[] = $param;
}
}
if (!empty($retained_params)) {
$query = '?'.implode($retained_params, '&');
}
}
// use port if non default
$port =
isset($parts['port']) &&
(($protocol === 'http://' && $parts['port'] !== 80) ||
($protocol === 'https://' && $parts['port'] !== 443))
? ':' . $parts['port'] : '';
// rebuild
return $protocol . $parts['host'] . $port . $parts['path'] . $query;
}
protected function shouldRetainParam($param) {
foreach (self::$DROP_QUERY_PARAMS as $drop_query_param) {
if (strpos($param, $drop_query_param.'=') === 0) {
return false;
}
}
return true;
}
protected function throwAPIException($result) {
$e = new FacebookApiException($result);
?>
CRON.php
<?php
require_once("src/facebook.php");
include("custom.php");
set_time_limit(0);
$config = array();
$config['array'] = $appID;
$config['secret'] = $appSecret;
$facebook = new Facebook($config);
$day = abs(date("j"));
$month = abs(date("n"));
$result = mysql_query("SELECT uid, uid2, name2 FROM birthdays WHERE birthmonth = '$month' AND birthday = '$day'");
while(($row = mysql_fetch_assoc($result)) && mysql_num_rows($result)) {
$link = $hostURL.'post.php?uid='.$row['uid'].'&uid2='.$row['uid2'];
$facebook->api('/'.$row['uid'].'/feed', 'POST',
array(
'link' => $link,
'from' => '299185790135651',
'picture' => $hostURL.'image.php?id='.$row['uid2'],
'name' => 'Send Cake',
'message' => 'It\'s '.$row['name2'].'\'s birthday today! Send them a virtual cake!',
'caption' => 'Sponsored by Intercake Ltd'
));
}
?>
also... what is 'from' => '299185790135651', ?
want to check my developer has put the right number here. Thanks

Answer 1

The best way to handle this is to use a try...catch statement. As follows:
try {
// some code that calls Facebook
} catch ( Exception $e ) {
// $e will contain the error - do what you want with it here
// e.g. log it or send an email alert etc.
}
The 'from' => '299185790135651' is a User / Page ID that publishes the message to the Feed. In this case, it's pointing to a Test Facebook Page.