LibreNMS/Util/Mail.php
<?php
/*
* Mail.php
*
* -Description-
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @package LibreNMS
* @link http://librenms.org
* @copyright 2021 Tony Murray
* @author Tony Murray <murraytony@gmail.com>
*/
namespace LibreNMS\Util;
use Exception;
use LibreNMS\Config;
use LibreNMS\Exceptions\RrdGraphException;
use PHPMailer\PHPMailer\PHPMailer;
class Mail
{
/**
* Parse string with emails. Return array with email (as key) and name (as value)
*
* @param string $emails
* @return array|false
*/
public static function parseEmails($emails)
{
$result = [];
$regex = '/^[\"\']?([^\"\']+)[\"\']?\s{0,}<([^@]+@[^>]+)>$/';
if (is_string($emails)) {
$emails = preg_split('/[,;]\s{0,}/', $emails);
foreach ($emails as $email) {
if (preg_match($regex, $email, $out, PREG_OFFSET_CAPTURE)) {
$result[$out[2][0]] = $out[1][0];
} else {
if (strpos($email, '@')) {
$from_name = Config::get('email_user');
$result[$email] = $from_name;
}
}
}
return $result;
}
// Return FALSE if input not string
return false;
}
/**
* Send email with PHPMailer
*
* @param string $emails
* @param string $subject
* @param string $message
* @param bool $html
* @return bool|string
*/
public static function send($emails, $subject, $message, bool $html = false, bool $bcc = false, ?bool $embedGraphs = null)
{
if (is_array($emails) || ($emails = self::parseEmails($emails))) {
d_echo("Attempting to email $subject to: " . implode('; ', array_keys($emails)) . PHP_EOL);
$mail = new PHPMailer(true);
try {
$mail->Hostname = php_uname('n');
foreach (self::parseEmails(Config::get('email_from')) as $from => $from_name) {
$mail->setFrom($from, $from_name);
}
// add addresses
$addMethod = $bcc ? 'addBcc' : 'addAddress';
foreach ($emails as $email => $email_name) {
$mail->$addMethod($email, $email_name);
}
$mail->Subject = $subject;
$mail->XMailer = Config::get('project_name');
$mail->CharSet = 'utf-8';
$mail->WordWrap = 76;
$mail->Body = $message;
if ($embedGraphs ?? Config::get('email_attach_graphs')) {
self::embedGraphs($mail, $html);
}
if ($html) {
$mail->isHTML();
}
switch (strtolower(trim(Config::get('email_backend')))) {
case 'sendmail':
$mail->Mailer = 'sendmail';
$mail->Sendmail = Config::get('email_sendmail_path');
break;
case 'smtp':
$mail->isSMTP();
$mail->Host = Config::get('email_smtp_host');
$mail->Timeout = Config::get('email_smtp_timeout');
$mail->SMTPAuth = Config::get('email_smtp_auth');
$mail->SMTPSecure = Config::get('email_smtp_secure');
$mail->Port = Config::get('email_smtp_port');
$mail->Username = Config::get('email_smtp_username');
$mail->Password = Config::get('email_smtp_password');
$mail->SMTPAutoTLS = Config::get('email_auto_tls');
$mail->SMTPDebug = 0;
break;
default:
$mail->Mailer = 'mail';
break;
}
return $mail->send();
} catch (\PHPMailer\PHPMailer\Exception $e) {
return $e->errorMessage();
} catch (Exception $e) {
return $e->getMessage();
}
}
return 'No contacts found';
}
/**
* Search for generated graph links, generate them, attach them to the email and update the url to a cid link
*/
private static function embedGraphs(PHPMailer $mail, bool $html = false): void
{
$body = $mail->Body;
// search for generated graphs
preg_match_all('#<img class=\"librenms-graph\" src=\"(.*?)\" ?/?>#', $body, $matches);
$count = 0;
foreach (array_combine($matches[1], $matches[0]) as $url => $tag) {
try {
$cid = 'graph' . ++$count;
// fetch image data
$image = Graph::getImage($url);
// attach image
$fileName = substr(Clean::fileName($image->title ?: $cid), 0, 250);
$mail->addStringEmbeddedImage(
$image->data,
$cid,
$fileName . '.' . $image->fileExtension(),
PHPMailer::ENCODING_BASE64,
$image->format->contentType()
);
// update image tag to link to attached image, or just the image name
if ($html) {
$body = str_replace($url, "cid:$cid", $body);
} else {
$body = str_replace($tag, "[$fileName]", $body);
}
} catch (RrdGraphException|\PHPMailer\PHPMailer\Exception $e) {
report($e);
}
}
$mail->Body = $body;
}
}