Ekdant-Online-Store/system/library/mail/smtp.php

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2024-08-06 12:21:00 +00:00
<?php
/**
* Basic SMTP mail class
*/
namespace Opencart\System\Library\Mail;
/**
* Class Smtp
*/
class Smtp {
/**
* @var array
*/
protected array $option = [];
/**
* @var array|int[]
*/
protected array $default = [
'smtp_port' => 25,
'smtp_timeout' => 5,
'max_attempts' => 3,
'verp' => false
];
/**
* Constructor
*
* @param array $option
*/
public function __construct(array &$option = []) {
foreach ($this->default as $key => $value) {
if (!isset($option[$key])) {
$option[$key] = $value;
}
}
$this->option = &$option;
}
/**
* Send
*
* @return bool
*/
public function send(): bool {
if (empty($this->option['smtp_hostname'])) {
throw new \Exception('Error: SMTP hostname required!');
}
if (empty($this->option['smtp_username'])) {
throw new \Exception('Error: SMTP username required!');
}
if (empty($this->option['smtp_password'])) {
throw new \Exception('Error: SMTP password required!');
}
if (empty($this->option['smtp_port'])) {
throw new \Exception('Error: SMTP port required!');
}
if (empty($this->option['smtp_timeout'])) {
throw new \Exception('Error: SMTP timeout required!');
}
if (is_array($this->option['to'])) {
$to = implode(',', $this->option['to']);
} else {
$to = $this->option['to'];
}
$boundary = '----=_NextPart_' . md5(time());
$header = 'MIME-Version: 1.0' . PHP_EOL;
$header .= 'To: <' . $to . '>' . PHP_EOL;
$header .= 'Subject: =?UTF-8?B?' . base64_encode($this->option['subject']) . '?=' . PHP_EOL;
$header .= 'Date: ' . date('D, d M Y H:i:s O') . PHP_EOL;
$header .= 'From: =?UTF-8?B?' . base64_encode($this->option['sender']) . '?= <' . $this->option['from'] . '>' . PHP_EOL;
if (empty($this->option['reply_to'])) {
$header .= 'Reply-To: =?UTF-8?B?' . base64_encode($this->option['sender']) . '?= <' . $this->option['from'] . '>' . PHP_EOL;
} else {
$header .= 'Reply-To: =?UTF-8?B?' . base64_encode($this->option['reply_to']) . '?= <' . $this->option['reply_to'] . '>' . PHP_EOL;
}
$header .= 'Return-Path: ' . $this->option['from'] . PHP_EOL;
$header .= 'X-Mailer: PHP/' . phpversion() . PHP_EOL;
$header .= 'Content-Type: multipart/mixed; boundary="' . $boundary . '"' . PHP_EOL . PHP_EOL;
$message = '--' . $boundary . PHP_EOL;
if (empty($this->option['html'])) {
$message .= 'Content-Type: text/plain; charset="utf-8"' . PHP_EOL;
$message .= 'Content-Transfer-Encoding: base64' . PHP_EOL . PHP_EOL;
$message .= chunk_split(base64_encode($this->option['text']), 950) . PHP_EOL;
} else {
$message .= 'Content-Type: multipart/alternative; boundary="' . $boundary . '_alt"' . PHP_EOL . PHP_EOL;
$message .= '--' . $boundary . '_alt' . PHP_EOL;
$message .= 'Content-Type: text/plain; charset="utf-8"' . PHP_EOL;
$message .= 'Content-Transfer-Encoding: base64' . PHP_EOL . PHP_EOL;
if (!empty($this->option['text'])) {
$message .= chunk_split(base64_encode($this->option['text']), 950) . PHP_EOL;
} else {
$message .= chunk_split(base64_encode('This is a HTML email and your email client software does not support HTML email!'), 950) . PHP_EOL;
}
$message .= '--' . $boundary . '_alt' . PHP_EOL;
$message .= 'Content-Type: text/html; charset="utf-8"' . PHP_EOL;
$message .= 'Content-Transfer-Encoding: base64' . PHP_EOL . PHP_EOL;
$message .= chunk_split(base64_encode($this->option['html']), 950) . PHP_EOL;
$message .= '--' . $boundary . '_alt--' . PHP_EOL;
}
if (!empty($this->option['attachments'])) {
foreach ($this->option['attachments'] as $attachment) {
if (is_file($attachment)) {
$handle = fopen($attachment, 'r');
$content = fread($handle, filesize($attachment));
fclose($handle);
$message .= '--' . $boundary . PHP_EOL;
$message .= 'Content-Type: application/octet-stream; name="' . basename($attachment) . '"' . PHP_EOL;
$message .= 'Content-Transfer-Encoding: base64' . PHP_EOL;
$message .= 'Content-Disposition: attachment; filename="' . basename($attachment) . '"' . PHP_EOL;
$message .= 'Content-ID: <' . urlencode(basename($attachment)) . '>' . PHP_EOL;
$message .= 'X-Attachment-Id: ' . urlencode(basename($attachment)) . PHP_EOL . PHP_EOL;
$message .= chunk_split(base64_encode($content), 950);
}
}
}
$message .= '--' . $boundary . '--' . PHP_EOL;
if (substr($this->option['smtp_hostname'], 0, 3) == 'tls') {
$hostname = substr($this->option['smtp_hostname'], 6);
} else {
$hostname = $this->option['smtp_hostname'];
}
$handle = fsockopen($hostname, $this->option['smtp_port'], $errno, $errstr, $this->option['smtp_timeout']);
if ($handle) {
if (substr(PHP_OS, 0, 3) != 'WIN') {
socket_set_timeout($handle, $this->option['smtp_timeout'], 0);
}
while ($line = fgets($handle, 515)) {
if (substr($line, 3, 1) == ' ') {
break;
}
}
fputs($handle, 'EHLO ' . getenv('SERVER_NAME') . "\r\n");
$reply = '';
while ($line = fgets($handle, 515)) {
$reply .= $line;
//some SMTP servers respond with 220 code before responding with 250. hence, we need to ignore 220 response string
if (substr($reply, 0, 3) == 220 && substr($line, 3, 1) == ' ') {
$reply = '';
continue;
} elseif (substr($line, 3, 1) == ' ') {
break;
}
}
if (substr($reply, 0, 3) != 250) {
throw new \Exception('Error: EHLO not accepted from server!');
}
if (substr($this->option['smtp_hostname'], 0, 3) == 'tls') {
fputs($handle, 'STARTTLS' . "\r\n");
$this->handleReply($handle, 220, 'Error: STARTTLS not accepted from server!');
if (stream_socket_enable_crypto($handle, true, STREAM_CRYPTO_METHOD_TLS_CLIENT) !== true) {
throw new \Exception('Error: TLS could not be established!');
}
fputs($handle, 'EHLO ' . getenv('SERVER_NAME') . "\r\n");
$this->handleReply($handle, 250, 'Error: EHLO not accepted from server!');
}
if (!empty($this->option['smtp_username']) && !empty($this->option['smtp_password'])) {
fputs($handle, 'AUTH LOGIN' . "\r\n");
$this->handleReply($handle, 334, 'Error: AUTH LOGIN not accepted from server!');
fputs($handle, base64_encode($this->option['smtp_username']) . "\r\n");
$this->handleReply($handle, 334, 'Error: Username not accepted from server!');
fputs($handle, base64_encode($this->option['smtp_password']) . "\r\n");
$this->handleReply($handle, 235, 'Error: Password not accepted from server!');
} else {
fputs($handle, 'HELO ' . getenv('SERVER_NAME') . "\r\n");
$this->handleReply($handle, 250, 'Error: HELO not accepted from server!');
}
if ($this->option['verp']) {
fputs($handle, 'MAIL FROM: <' . $this->option['from'] . '>XVERP' . "\r\n");
} else {
fputs($handle, 'MAIL FROM: <' . $this->option['from'] . '>' . "\r\n");
}
$this->handleReply($handle, 250, 'Error: MAIL FROM not accepted from server!');
if (!is_array($this->option['to'])) {
fputs($handle, 'RCPT TO: <' . $this->option['to'] . '>' . "\r\n");
$reply = $this->handleReply($handle, false, 'RCPT TO [!array]');
if ((substr($reply, 0, 3) != 250) && (substr($reply, 0, 3) != 251)) {
throw new \Exception('Error: RCPT TO not accepted from server!');
}
} else {
foreach ($this->option['to'] as $recipient) {
fputs($handle, 'RCPT TO: <' . $recipient . '>' . "\r\n");
$reply = $this->handleReply($handle, false, 'RCPT TO [array]');
if ((substr($reply, 0, 3) != 250) && (substr($reply, 0, 3) != 251)) {
throw new \Exception('Error: RCPT TO not accepted from server!');
}
}
}
fputs($handle, 'DATA' . "\r\n");
$this->handleReply($handle, 354, 'Error: DATA not accepted from server!');
// According to rfc 821 we should not send more than 1000 including the CRLF
$message = str_replace("\r\n", "\n", $header . $message);
$message = str_replace("\r", "\n", $message);
$lines = explode("\n", $message);
foreach ($lines as $line) {
// see https://php.watch/versions/8.2/str_split-empty-string-empty-array
$results = ($line === '') ? [''] : str_split($line, 998);
foreach ($results as $result) {
fputs($handle, $result . "\r\n");
}
}
fputs($handle, '.' . "\r\n");
$this->handleReply($handle, 250, 'Error: DATA not accepted from server!');
fputs($handle, 'QUIT' . "\r\n");
$this->handleReply($handle, 221, 'Error: QUIT not accepted from server!');
fclose($handle);
return true;
} else {
throw new \Exception('Error: ' . $errstr . ' (' . $errno . ')');
return false;
}
}
/**
* handleReply
*
* @param array $handle
* @param bool $status_code
* @param bool $error_text
* @param int $counter
*
* @return string
*/
private function handleReply($handle, $status_code = false, $error_text = false, $counter = 0) {
$reply = '';
while (($line = fgets($handle, 515)) !== false) {
$reply .= $line;
if (substr($line, 3, 1) == ' ') {
break;
}
}
// Handle slowish server responses (generally due to policy servers)
if (!$line && empty($reply) && $counter < $this->option['max_attempts']) {
sleep(1);
$counter++;
return $this->handleReply($handle, $status_code, $error_text, $counter);
}
if ($status_code) {
if (substr($reply, 0, 3) != $status_code) {
throw new \Exception($error_text);
}
}
return $reply;
}
}