/**
* Creates a random token string that can be used to track a single
* email delivery. The returned token string will only contain
* lowercase alphanumeric characters and will start with a lowercase
* letter to avoid problems with special processing being triggered
* by special characters in the token string.
*
* @return random token string
*/
private function _create_email_token()
{
//Testers need dummy token
if ($this->test_mode) {
return 'dummy';
}
//Use mt_rand if possible (faster, more random)
if (function_exists('mt_rand')) {
$rand = 'mt_rand';
} else {
$rand = 'rand';
}
$tokenchars = 'abcdefghijklmnopqrstuvwxyz0123456789';
$token = $tokenchars[$rand(0, strlen($tokenchars) - 11)];
for ($i = 1; $i < $this->token_size; $i++) {
$token .= $tokenchars[$rand(0, strlen($tokenchars) - 1)];
}
//If token is not free or (very, very unlikely) matches our dummy token, recurse.
if (!org_openpsa_directmarketing_campaign_messagereceipt_dba::token_is_free($token) || $token === 'dummy') {
return $this->_create_email_token();
}
return $token;
}
