public function redirect()
{
$token = $this->getParam('token');
$url_id = Hasher::decode($token);
$query = $this->getService('DB')->prepare('SELECT * from urls WHERE id = :url_id');
$query->bindParam(':url_id', $url_id);
$query->execute();
$result = $query->fetch(\PDO::FETCH_ASSOC);
return $result ? $this->getResponse()->withRedirect($result['url']) : $this->getResponse()->withStatus(404)->write('Not Found');
}
public function abridge()
{
$url = $this->getParam('url');
if (empty($url)) {
return $this->output(false, 'No URL is provided');
}
if (!filter_var($url, FILTER_VALIDATE_URL)) {
return $this->output(false, 'The given URL is malformed');
}
if (strlen($url) > self::MAX_URL_LEN) {
return $this->output(false, 'The given URL exceeds the maximum length');
}
$query = $this->getService('DB')->prepare('INSERT INTO urls (url) VALUES (:url) ON DUPLICATE KEY UPDATE id = LAST_INSERT_ID(id)');
$query->bindParam(':url', $url);
$query->execute();
$url_id = $this->getService('DB')->lastInsertId();
if (!$url_id) {
return $this->output(false, 'Unable to generate a token for the given URL');
}
$token = Hasher::encode($url_id);
return $this->output(true, 'OK', $token);
}
public function testDecode()
{
$this->assertEquals(1, Hasher::decode('zlwrymre'));
$this->assertFalse(Hasher::decode(''));
}