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<?php
namespace Laminas\Mail\Protocol;
use Laminas\Mail\Protocol\Pop3\Response;
use Laminas\Stdlib\ErrorHandler;
use function explode;
use function fclose;
use function fgets;
use function fwrite;
use function is_string;
use function md5;
use function rtrim;
use function stream_socket_enable_crypto;
use function strpos;
use function strtok;
use function strtolower;
use function substr;
use function trim;
class Pop3
{
use ProtocolTrait;
/**
* Default timeout in seconds for initiating session
*/
public const TIMEOUT_CONNECTION = 30;
/**
* saves if server supports top
*
* @var null|bool
*/
public $hasTop;
/** @var null|resource */
protected $socket;
/**
* greeting timestamp for apop
*
* @var null|string
*/
protected $timestamp;
/**
* Public constructor
*
* @param string $host hostname or IP address of POP3 server, if given connect() is called
* @param int|null $port port of POP3 server, null for default (110 or 995 for ssl)
* @param bool|string $ssl use ssl? 'SSL', 'TLS' or false
* @param bool $novalidatecert set to true to skip SSL certificate validation
*/
public function __construct($host = '', $port = null, $ssl = false, $novalidatecert = false)
{
$this->setNoValidateCert($novalidatecert);
if ($host) {
$this->connect($host, $port, $ssl);
}
}
/**
* Public destructor
*/
public function __destruct()
{
$this->logout();
}
/**
* Open connection to POP3 server
*
* @param string $host hostname or IP address of POP3 server
* @param int|null $port of POP3 server, default is 110 (995 for ssl)
* @param string|bool $ssl use 'SSL', 'TLS' or false
* @throws Exception\RuntimeException
* @return string welcome message
*/
public function connect($host, $port = null, $ssl = false)
{
$transport = 'tcp';
$isTls = false;
if ($ssl) {
$ssl = strtolower($ssl);
}
switch ($ssl) {
case 'ssl':
$transport = 'ssl';
if (! $port) {
$port = 995;
}
break;
case 'tls':
$isTls = true;
// break intentionally omitted
default:
if (! $port) {
$port = 110;
}
}
$this->socket = $this->setupSocket($transport, $host, $port, self::TIMEOUT_CONNECTION);
$welcome = $this->readResponse();
strtok($welcome, '<');
$this->timestamp = strtok('>');
if (! strpos($this->timestamp, '@')) {
$this->timestamp = null;
} else {
$this->timestamp = '<' . $this->timestamp . '>';
}
if ($isTls) {
$this->request('STLS');
$result = stream_socket_enable_crypto($this->socket, true, $this->getCryptoMethod());
if (! $result) {
throw new Exception\RuntimeException('cannot enable TLS');
}
}
return $welcome;
}
/**
* Send a request
*
* @param string $request your request without newline
* @throws Exception\RuntimeException
*/
public function sendRequest($request)
{
ErrorHandler::start();
$result = fwrite($this->socket, $request . "\r\n");
$error = ErrorHandler::stop();
if (! $result) {
throw new Exception\RuntimeException('send failed - connection closed?', 0, $error);
}
}
/**
* read a response
*
* @param bool $multiline response has multiple lines and should be read until "<nl>.<nl>"
* @throws Exception\RuntimeException
* @return string response
*/
public function readResponse($multiline = false)
{
$response = $this->readRemoteResponse();
if ($response->status() != '+OK') {
throw new Exception\RuntimeException('last request failed');
}
$message = $response->message();
if ($multiline) {
$message = '';
$line = fgets($this->socket);
while ($line && rtrim($line, "\r\n") != '.') {
if ($line[0] == '.') {
$line = substr($line, 1);
}
$message .= $line;
$line = fgets($this->socket);
}
}
return $message;
}
/**
* read a response
* return extracted status / message from response
* @throws Exception\RuntimeException
*/
protected function readRemoteResponse(): Response
{
ErrorHandler::start();
$result = fgets($this->socket);
$error = ErrorHandler::stop();
if (! is_string($result)) {
throw new Exception\RuntimeException('read failed - connection closed?', 0, $error);
}
$result = trim($result);
if (strpos($result, ' ')) {
[$status, $message] = explode(' ', $result, 2);
} else {
$status = $result;
$message = '';
}
return new Response($status, $message);
}
/**
* Send request and get response
*
* @see sendRequest()
* @see readResponse()
*
* @param string $request request
* @param bool $multiline multiline response?
* @return string result from readResponse()
*/
public function request($request, $multiline = false)
{
$this->sendRequest($request);
return $this->readResponse($multiline);
}
/**
* End communication with POP3 server (also closes socket)
*/
public function logout()
{
if ($this->socket) {
try {
$this->request('QUIT');
} catch (Exception\ExceptionInterface) {
// ignore error - we're closing the socket anyway
}
fclose($this->socket);
$this->socket = null;
}
}
/**
* Get capabilities from POP3 server
*
* @return array list of capabilities
*/
public function capa()
{
$result = $this->request('CAPA', true);
return explode("\n", $result);
}
/**
* Login to POP3 server. Can use APOP
*
* @param string $user username
* @param string $password password
* @param bool $tryApop should APOP be tried?
*/
public function login($user, $password, $tryApop = true)
{
if ($tryApop && $this->timestamp) {
try {
$this->request("APOP $user " . md5($this->timestamp . $password));
return;
} catch (Exception\ExceptionInterface) {
// ignore
}
}
$this->request("USER $user");
$this->request("PASS $password");
}
/**
* Make STAT call for message count and size sum
*
* @param int $messages out parameter with count of messages
* @param int $octets out parameter with size in octets of messages
*/
public function status(&$messages, &$octets)
{
$messages = 0;
$octets = 0;
$result = $this->request('STAT');
[$messages, $octets] = explode(' ', $result);
}
/**
* Make LIST call for size of message(s)
*
* @param int|null $msgno number of message, null for all
* @return int|array size of given message or list with array(num => size)
*/
public function getList($msgno = null)
{
if ($msgno !== null) {
$result = $this->request("LIST $msgno");
[, $result] = explode(' ', $result);
return (int) $result;
}
$result = $this->request('LIST', true);
$messages = [];
$line = strtok($result, "\n");
while ($line) {
[$no, $size] = explode(' ', trim($line));
$messages[(int) $no] = (int) $size;
$line = strtok("\n");
}
return $messages;
}
/**
* Make UIDL call for getting a uniqueid
*
* @param int|null $msgno number of message, null for all
* @return string|array uniqueid of message or list with array(num => uniqueid)
*/
public function uniqueid($msgno = null)
{
if ($msgno !== null) {
$result = $this->request("UIDL $msgno");
[, $result] = explode(' ', $result);
return $result;
}
$result = $this->request('UIDL', true);
$result = explode("\n", $result);
$messages = [];
foreach ($result as $line) {
if (! $line) {
continue;
}
[$no, $id] = explode(' ', trim($line), 2);
$messages[(int) $no] = $id;
}
return $messages;
}
/**
* Make TOP call for getting headers and maybe some body lines
* This method also sets hasTop - before it it's not known if top is supported
*
* The fallback makes normal RETR call, which retrieves the whole message. Additional
* lines are not removed.
*
* @param int $msgno number of message
* @param int $lines number of wanted body lines (empty line is inserted after header lines)
* @param bool $fallback fallback with full retrieve if top is not supported
* @throws Exception\RuntimeException
* @throws Exception\ExceptionInterface
* @return string message headers with wanted body lines
*/
public function top($msgno, $lines = 0, $fallback = false)
{
if ($this->hasTop === false) {
if ($fallback) {
return $this->retrieve($msgno);
}
throw new Exception\RuntimeException('top not supported and no fallback wanted');
}
$this->hasTop = true;
$lines = ! $lines || $lines < 1 ? 0 : (int) $lines;
try {
$result = $this->request("TOP $msgno $lines", true);
} catch (Exception\ExceptionInterface $e) {
$this->hasTop = false;
if ($fallback) {
$result = $this->retrieve($msgno);
} else {
throw $e;
}
}
return $result;
}
/**
* Make a RETR call for retrieving a full message with headers and body
*
* @param int $msgno message number
* @return string message
*/
public function retrieve($msgno)
{
return $this->request("RETR $msgno", true);
}
/**
* Make a NOOP call, maybe needed for keeping the server happy
*/
public function noop()
{
$this->request('NOOP');
}
/**
* Make a DELE count to remove a message
*
* @param int $msgno
*/
public function delete($msgno)
{
$this->request("DELE $msgno");
}
/**
* Make RSET call, which rollbacks delete requests
*/
public function undelete()
{
$this->request('RSET');
}
}