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<?php
/*
* File: ImapProtocol.php
* Category: Protocol
* Author: M.Goldenbaum
* Created: 16.09.20 18:27
* Updated: -
*
* Description:
* -
*/
namespace Webklex\PHPIMAP\Connection\Protocols;
use Webklex\PHPIMAP\Exceptions\ConnectionFailedException;
/**
* Class Protocol
*
* @package Webklex\PHPIMAP\Connection\Protocols
*/
abstract class Protocol implements ProtocolInterface {
/**
* Default connection timeout in seconds
*/
protected $connection_timeout = 30;
/**
* @var boolean
*/
protected $debug = false;
/**
* @var false|resource
*/
public $stream = false;
/**
* Connection encryption method
* @var mixed $encryption
*/
protected $encryption = false;
/**
* Set to false to ignore SSL certificate validation
* @var bool
*/
protected $cert_validation = true;
/**
* Proxy settings
* @var array
*/
protected $proxy = [
'socket' => null,
'request_fulluri' => false,
'username' => null,
'password' => null,
];
/**
* Get an available cryptographic method
*
* @return int
*/
public function getCryptoMethod() {
// Allow the best TLS version(s) we can
$cryptoMethod = STREAM_CRYPTO_METHOD_TLS_CLIENT;
// PHP 5.6.7 dropped inclusion of TLS 1.1 and 1.2 in STREAM_CRYPTO_METHOD_TLS_CLIENT
// so add them back in manually if we can
if (defined('STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT')) {
$cryptoMethod = STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT;
}elseif (defined('STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT')) {
$cryptoMethod = STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT;
}
return $cryptoMethod;
}
/**
* Enable SSL certificate validation
*
* @return $this
*/
public function enableCertValidation() {
$this->cert_validation = true;
return $this;
}
/**
* Disable SSL certificate validation
* @return $this
*/
public function disableCertValidation() {
$this->cert_validation = false;
return $this;
}
/**
* Set SSL certificate validation
* @var int $cert_validation
*
* @return $this
*/
public function setCertValidation($cert_validation) {
$this->cert_validation = $cert_validation;
return $this;
}
/**
* Should we validate SSL certificate?
*
* @return bool
*/
public function getCertValidation() {
return $this->cert_validation;
}
/**
* Set connection proxy settings
* @var array $options
*
* @return $this
*/
public function setProxy($options) {
foreach ($this->proxy as $key => $val) {
if (isset($options[$key])) {
$this->proxy[$key] = $options[$key];
}
}
return $this;
}
/**
* Get the current proxy settings
*
* @return array
*/
public function getProxy() {
return $this->proxy;
}
/**
* Prepare socket options
* @var string $transport
*
* @return array
*/
private function defaultSocketOptions($transport) {
$options = [];
if ($this->encryption != false) {
$options["ssl"] = [
'verify_peer_name' => $this->getCertValidation(),
'verify_peer' => $this->getCertValidation(),
];
}
if ($this->proxy["socket"] != null) {
$options[$transport]["proxy"] = $this->proxy["socket"];
$options[$transport]["request_fulluri"] = $this->proxy["request_fulluri"];
if ($this->proxy["username"] != null) {
$auth = base64_encode($this->proxy["username"].':'.$this->proxy["password"]);
$options[$transport]["header"] = [
"Proxy-Authorization: Basic $auth"
];
}
}
return $options;
}
/**
* Create a new resource stream
* @param $transport
* @param string $host hostname or IP address of IMAP server
* @param int $port of IMAP server, default is 143 (993 for ssl)
* @param int $timeout timeout in seconds for initiating session
*
* @return resource|boolean The socket created.
* @throws ConnectionFailedException
*/
protected function createStream($transport, $host, $port, $timeout) {
$socket = "$transport://$host:$port";
$stream = stream_socket_client($socket, $errno, $errstr, $timeout,
STREAM_CLIENT_CONNECT,
stream_context_create($this->defaultSocketOptions($transport))
);
stream_set_timeout($stream, $timeout);
if (!$stream) {
throw new ConnectionFailedException($errstr, $errno);
}
if (false === stream_set_timeout($stream, $timeout)) {
throw new ConnectionFailedException('Failed to set stream timeout');
}
return $stream;
}
/**
* @return int
*/
public function getConnectionTimeout() {
return $this->connection_timeout;
}
/**
* @param int $connection_timeout
* @return Protocol
*/
public function setConnectionTimeout($connection_timeout) {
if ($connection_timeout !== null) {
$this->connection_timeout = $connection_timeout;
}
return $this;
}
}