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