/**
* Returns the connection.
*
* @return SFTP connected client instance
* @throws \Exception when the connection failed
*/
public function getConnection()
{
if (!is_null($this->client)) {
return $this->client;
}
$hostKeys = $this->readHostKeys();
$this->client = new SFTP($this->host, $this->port);
// The SSH Host Key MUST be verified before login().
$currentHostKey = $this->client->getServerPublicHostKey();
if (array_key_exists($this->host, $hostKeys)) {
if ($hostKeys[$this->host] != $currentHostKey) {
throw new \Exception('Host public key does not match known key');
}
} else {
$hostKeys[$this->host] = $currentHostKey;
$this->writeHostKeys($hostKeys);
}
if (!$this->client->login($this->user, $this->password)) {
throw new \Exception('Login failed');
}
return $this->client;
}
