/**
* The main page handler, outputs a 1x1 pixel image.
*/
public function get()
{
if ($t = Request::get('t', 'encrypted')) {
// Track an encrypted link.
if (!Tracker::trackLink($t)) {
Logger::error('Failed to track encrypted link: ' . Encryption::aesDecrypt($t, Configuration::get('tracker.key')));
}
} elseif (Configuration::get('tracker.allow_unencrypted') && ($tracker = Request::get('tracker', 'int'))) {
// Track an unencrypted link.
$user = Request::get('user', 'int') ?: ClientUser::createInstance()->id;
$sub = Request::get('sub', 'int');
Tracker::trackEventID($tracker, $sub, $user);
}
// Output a single pixel image.
header('Content-Type: image/png');
echo base64_decode('iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAACnej3aAAAAAXRSTlMAQObYZgAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=');
exit;
}
/**
* Load a user by an encrypted reference.
*
* @param string $cypher_string
* The encrypted email address.
*
* @return bool|User
* The user if loading was successful.
*/
public static function loadByEncryptedUserReference($cypher_string)
{
$email = Encryption::aesDecrypt($cypher_string, Configuration::get('user.key'));
return static::loadByEmail($email);
}
public function executeGenerateAesKey()
{
echo 'Key: ' . Encryption::generateAesKey() . "\n\n";
}
/**
* Add a tracker hit from an encrypted link.
*
* @param string $tracker_string
* Encrypted data.
*
* @return boolean
* Whether the link was tracked.
*/
public static function trackLink($tracker_string)
{
// Decrypt and decode the string with the private key.
$string = Encryption::aesDecrypt($tracker_string, Configuration::get('tracker.key'));
if ($data = json_decode($string, true)) {
// Track the data.
self::trackEventID($data['tracker'], $data['sub'], $data['user']);
return true;
}
return false;
}
public static function decrypt($data)
{
// TODO: use remote AES encryption method for isolated HSM.
$table_key = Configuration::get('lightning.table.encryption_key');
return Encryption::aesDecrypt($data, $table_key);
}