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<?php
/**
 * This code is licensed under AGPLv3 license or Afterlogic Software License
 * if commercial version of the product was purchased.
 * For full statements of the licenses see LICENSE-AFTERLOGIC and LICENSE-AGPL3 files.
 */

namespace Aurora\System\Net;

/**
 * @license https://www.gnu.org/licenses/agpl-3.0.html AGPL-3.0
 * @license https://afterlogic.com/products/common-licensing Afterlogic Software License
 * @copyright Copyright (c) 2019, Afterlogic Corp.
 *
 * @package Api
 * @subpackage Net
 */
abstract class AbstractProtocol
{
    /**
     * @var resource
     */
    protected $rConnect;

/**
     * @var string
     */
    protected $sHost;

/**
     * @var int
     */
    protected $iPort;

/**
     * @var bool
     */
    protected $bUseSsl;

/**
     * @var int
     */
    protected $iConnectTimeOut;

/**
     * @var int
     */
    protected $iSocketTimeOut;

/**
     * @param string $sHost
     * @param int $iPort
     * @param bool $bUseSsl = false
     * @param int $iConnectTimeOut = null
     * @param int $iSocketTimeOut = null
     */
    public function __construct($sHost, $iPort, $bUseSsl = false, $iConnectTimeOut = null, $iSocketTimeOut = null)
    {
        $oSettings = & \Aurora\System\Api::GetSettings();
        $iConnectTimeOut = (null === $iConnectTimeOut) ? $oSettings->GetValue('SocketConnectTimeoutSeconds', 5) : $iConnectTimeOut;
        $iSocketTimeOut = (null === $iSocketTimeOut) ? $oSettings->GetValue('SocketGetTimeoutSeconds', 5) : $iSocketTimeOut;

$this->sHost = $sHost;
        $this->iPort = $iPort;
        $this->bUseSsl = $bUseSsl;
        $this->iConnectTimeOut = $iConnectTimeOut;
        $this->iSocketTimeOut = $iSocketTimeOut;
    }

/**
     * @return bool
     */
    public function Connect()
    {
        $sHost = ($this->bUseSsl) ? 'ssl://' . $this->sHost : $this->sHost;

if ($this->IsConnected()) {
            \Aurora\System\Api::Log('already connected[' . $sHost . ':' . $this->iPort . ']: result = false', \Aurora\System\Enums\LogLevel::Error);

$this->Disconnect();
            return false;
        }

$sErrorStr = '';
        $iErrorNo = 0;

\Aurora\System\Api::Log('start connect to ' . $sHost . ':' . $this->iPort);
        $this->rConnect = @fsockopen($sHost, $this->iPort, $iErrorNo, $sErrorStr, $this->iConnectTimeOut);

if (!$this->IsConnected()) {
            \Aurora\System\Api::Log('connection error[' . $sHost . ':' . $this->iPort . ']: fsockopen = false (' . $iErrorNo . ': ' . $sErrorStr . ')', \Aurora\System\Enums\LogLevel::Error);
            return false;
        } else {
            \Aurora\System\Api::Log('connected');
        }

if (\MailSo\Base\Utils::FunctionExistsAndEnabled('stream_set_timeout')) {
            @stream_set_timeout($this->rConnect, $this->iSocketTimeOut);
        }

if (\MailSo\Base\Utils::FunctionExistsAndEnabled('@stream_set_blocking')) {
            @stream_set_blocking($this->rConnect, true);
        }

return true;
    }

/**
     * @return bool
     */
    public function Disconnect()
    {
        if ($this->IsConnected()) {
            \Aurora\System\Api::Log('disconnect from ' . $this->sHost . ':' . $this->iPort);
            @fclose($this->rConnect);
        }
        $this->rConnect = null;
        return true;
    }

/**
     * @return resource
     */
    public function GetConnectResource()
    {
        return $this->rConnect;
    }

/**
     * @return bool
     */
    public function IsConnected()
    {
        return is_resource($this->rConnect);
    }

/**
     * @return string | bool
     */
    public function ReadLine()
    {
        $sLine = @fgets($this->rConnect, 4096);
        \Aurora\System\Api::Log('NET < ' . \Aurora\System\Utils::ShowCRLF($sLine));

if (false === $sLine) {
            $aSocketStatus = @socket_get_status($this->rConnect);
            if (isset($aSocketStatus['timed_out']) && $aSocketStatus['timed_out']) {
                \Aurora\System\Api::Log('NET[Error] < Socket timeout reached during connection.', \Aurora\System\Enums\LogLevel::Error);
            } else {
                \Aurora\System\Api::Log('NET[Error] < fgets = false', \Aurora\System\Enums\LogLevel::Error);
            }
        }

return $sLine;
    }

/**
     * @param string $sLine
     * @return bool
     */
    public function WriteLine($sLine, $aHideValues = array())
    {
        $sLine = $sLine . "\r\n";
        $sLogLine = (0 < count($aHideValues))
            ? str_replace($aHideValues, '*******', $sLine) : $sLine;

\Aurora\System\Api::Log('NET > ' . \Aurora\System\Utils::ShowCRLF($sLogLine));

if (!@fputs($this->rConnect, $sLine)) {
            \Aurora\System\Api::Log('NET[Error] < Could not send user request', \Aurora\System\Enums\LogLevel::Error);
            return false;
        }

return true;
    }
}