/**
* Lookup nonce value for the tool consumer.
*
* @param OAuthConsumer $consumer OAuthConsumer object
* @param string $token Token value
* @param string $value Nonce value
* @param string $timestamp Date/time of request
* @return boolean True if the nonce value already exists
*/
function lookup_nonce($consumer, $token, $value, $timestamp)
{
$nonce = new LTI_Consumer_Nonce($this->tool_provider->consumer, $value);
$ok = !$nonce->load();
if ($ok) {
$ok = $nonce->save();
}
if (!$ok) {
$this->tool_provider->reason = 'Invalid nonce.';
}
return !$ok;
}
/**
* Save the consumer nonce in the database
*
* @param LTI_Consumer_Nonce $nonce
* @return bool
*/
public function Consumer_Nonce_save($nonce)
{
$key = $nonce->getKey();
$value = $nonce->getValue();
$expires = date('Y-m-d H:i:s', $nonce->expires);
$sql = 'INSERT INTO ' . $this->dbTableNamePrefix . LTI_Data_Connector::NONCE_TABLE_NAME . ' (consumer_key, value, expires) VALUES (:key, :value, :expires)';
$query = $this->db->prepare($sql);
$query->bindValue('key', $key, PDO::PARAM_STR);
$query->bindValue('value', $value, PDO::PARAM_STR);
$query->bindValue('expires', $expires, PDO::PARAM_STR);
$ok = $query->execute();
return $ok;
}
