expmail/sender.php

<?php

require_once 'vendor/autoload.php';
require_once 'config.php';
require_once 'File.class.php';

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

$mailer = new PHPMailer(true);

try {
    if (!$json = json_decode(file_get_contents('php://input'), true)) throw new Exception("There is nothing here.");

    if (!$json["key"]) throw new Exception("What's the code word?");

    if (!in_array($json["key"], $API_KEYS)) throw new Exception("Who are you?");

    if ($json["html"]) {
        $html = $json["html"];
    } else if ($json["htmlurl"]) {
        try {
            $htmlfile = new File($json["htmlurl"]);
            $html = $htmlfile->fetch_file();
        } catch (\Exception $e) {
            throw new Exception("Could not fetch URL for HTML message: " . $e->getMessage());
        }
    }

    if ($json["text"]) {
        $text = $json["text"];
    } else if ($json["texturl"]) {
        try {
            $textfile = new File($json["texturl"]);
            $text = $textfile->fetch_file();
        } catch (\Exception $e) {
            throw new Exception("Could not fetch URL for plain text message: " . $e->getMessage());
        }
    }

    foreach ($json["placeholders"] as $placeholder) {
        $html = str_replace("{".strtoupper($placeholder["name"])."}", $placeholder["value"], $html);
        $text = str_replace("{".strtoupper($placeholder["name"])."}", $placeholder["value"], $text);
    }

    $mailer->isSMTP();
    $mailer->Host = $MAIL_HOST;
    $mailer->SMTPAuth = (bool) $MAIL_USER;
    $mailer->Username = $MAIL_USER;
    $mailer->Password = $MAIL_PASS;
    $mailer->SMTPSecure = ($MAIL_STARTTLS ? PHPMailer::ENCRYPTION_STARTTLS : ($MAIL_SMTPS ? PHPMailer::ENCRYPTION_SMTPS : false));
    $mailer->Port = ($MAIL_PORT ? $MAIL_PORT : ($MAIL_SMTPS ? 465 : 587));
    $mailer->XMailer = "Kumi Systems Mailer 0.1 (https://kumi.systems/)";

    if ($json["sender"]["email"]) {
        $mailer->setFrom($json["sender"]["email"], $json["sender"]["name"]);
    } else {
        $mailer->setFrom(($MAIL_FROM_MAIL ? $MAIL_FROM_MAIL : $MAIL_USER), $MAIL_FROM_NAME);
    };

    foreach ($json["recipients"] as $recipient) $mailer->addAddress($recipient["email"], $recipient["name"]);
    foreach ($json["ccs"] as $cc) $mailer->addCC($cc["email"], $cc["name"]);
    foreach ($json["bccs"] as $bcc) $mailer->addBCC($bcc["email"], $bcc["name"]);

    foreach ($ALWAYS_TO as $recipient) $mailer->addAddress($recipient);
    foreach ($ALWAYS_CC as $cc) $mailer->addCC($cc);
    foreach ($ALWAYS_BCC as $bcc) $mailer->addBCC($bcc);

    $mailer->isHTML((bool) $html);
    $mailer->Subject = $json["subject"];
    $mailer->Body = ($html ? $html : $text);
    $mailer->AltBody = ($html ? $text : null);

    foreach ($json["attachments"] as $attachment) {
        $file = new File($attachment["url"]);
        if ($file->get_status() >= 400) throw new Exception("Error downloading " . $attachment["url"] . " - Status: " . $file->get_status());
        $content = $file->fetch_file();
        $filename = ($attachment["filename"] ? $attachment["filename"] : $file->get_filename());
        $cid = ($attachment["cid"] ? $attachment["cid"] : 0);
        $mailer->addStringEmbeddedImage($content, $cid, $filename);
    }

    $mailer->send();

    $response = array(
        "status" => "success"
    );

} catch (\Exception $e) {
    $response = array(
        "status" => "error",
        "error" => "{$e->getMessage()}"
    );
};

echo json_encode($response);