php-smtp-checker/index.php at main · harrisonratcliffe/php-smtp-checker · GitHub

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<?php
declare(strict_types=1);

use PHPMailer\PHPMailer\PHPMailer;

function loadMailerDependencies(): void
{
    $autoload = __DIR__ . '/vendor/autoload.php';
    if (file_exists($autoload)) {
        require_once $autoload;

        return;
    }

    $bundledFiles = [
        __DIR__ . '/lib/phpmailer/src/Exception.php',
        __DIR__ . '/lib/phpmailer/src/PHPMailer.php',
        __DIR__ . '/lib/phpmailer/src/SMTP.php',
    ];

    foreach ($bundledFiles as $file) {
        if (!file_exists($file)) {
            throw new RuntimeException('PHPMailer dependencies were not found. Install with Composer or restore /lib/phpmailer.');
        }
        require_once $file;
    }
}

function postValue(string $key, string $fallback = '', bool $trimValue = true): string
{
    if (!isset($_POST[$key])) {
        return $fallback;
    }

    $value = (string) $_POST[$key];

    return $trimValue ? trim($value) : $value;
}

function h(string $value): string
{
    return htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
}

function selected(string $value, string $expected): string
{
    return $value === $expected ? 'selected' : '';
}

$formData = [
    'smtp_server' => '',
    'smtp_port' => '587',
    'smtp_encryption' => 'tls',
    'smtp_debug' => '0',
    'smtp_username' => '',
    'smtp_password' => '',
    'email_from' => '',
    'email_to' => '',
];

$message = '';
$messageType = 'error';

if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['smtp'])) {
    foreach (array_keys($formData) as $key) {
        $formData[$key] = postValue($key, $formData[$key], $key !== 'smtp_password');
    }

    try {
        loadMailerDependencies();

        if ($formData['smtp_server'] === '') {
            throw new InvalidArgumentException('SMTP server is required.');
        }

        $port = filter_var(
            $formData['smtp_port'],
            FILTER_VALIDATE_INT,
            ['options' => ['min_range' => 1, 'max_range' => 65535]]
        );
        if ($port === false) {
            throw new InvalidArgumentException('SMTP port must be a number between 1 and 65535.');
        }

        $encryptionMap = [
            'none' => '',
            'ssl' => PHPMailer::ENCRYPTION_SMTPS,
            'tls' => PHPMailer::ENCRYPTION_STARTTLS,
        ];
        if (!array_key_exists($formData['smtp_encryption'], $encryptionMap)) {
            throw new InvalidArgumentException('Encryption must be one of: none, ssl, tls.');
        }

        $allowedDebugLevels = ['0', '1', '2', '3', '4'];
        if (!in_array($formData['smtp_debug'], $allowedDebugLevels, true)) {
            throw new InvalidArgumentException('Debug mode must be between 0 and 4.');
        }

        if (!filter_var($formData['email_from'], FILTER_VALIDATE_EMAIL)) {
            throw new InvalidArgumentException('The "Email from" address is not valid.');
        }

        if (!filter_var($formData['email_to'], FILTER_VALIDATE_EMAIL)) {
            throw new InvalidArgumentException('The "Email to" address is not valid.');
        }

        $email = new PHPMailer(true);
        $email->isSMTP();
        $email->Host = $formData['smtp_server'];
        $email->Port = (int) $port;
        $email->SMTPAuth = true;
        $email->SMTPDebug = (int) $formData['smtp_debug'];
        $email->SMTPSecure = $encryptionMap[$formData['smtp_encryption']];
        $email->Username = $formData['smtp_username'];
        $email->Password = $formData['smtp_password'];
        $email->setFrom($formData['email_from']);
        $email->addAddress($formData['email_to']);
        $email->Subject = 'SMTP Test Email';
        $email->Body = 'Hooray, your SMTP is working correctly!';
        $email->send();

        $messageType = 'success';
        $message = 'SMTP is working and the test email was sent successfully.';
    } catch (Throwable $exception) {
        $message = 'SMTP test failed: ' . $exception->getMessage();
    }
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="author" content="Harrison Ratcliffe">
    <meta name="description" content="A simple tool to check your SMTP is working, built in PHP.">
    <title>PHP SMTP Checker</title>
    <link rel="stylesheet" href="style.css">
    <link rel="stylesheet" href="https://unpkg.com/purecss@2.1.0/build/pure-min.css">
    <link rel="stylesheet" href="https://unpkg.com/purecss@2.1.0/build/grids-responsive-min.css">
</head>
<body>
    <main class="container">
        <form action="<?= h($_SERVER['PHP_SELF'] ?? 'index.php') ?>" method="post" class="pure-form pure-form-stacked">
            <fieldset>
                <legend>PHP SMTP Checker</legend>
                <?php if ($message !== '') : ?>
                    <div class="alert alert-<?= h($messageType) ?>" role="alert">
                        <?= h($message) ?>
                    </div>
                <?php endif; ?>
                <div class="pure-g">
                    <div class="pure-u-1 pure-u-md-1-3">
                        <label for="smtp_server">SMTP Server</label>
                        <input id="smtp_server" type="text" name="smtp_server" required placeholder="smtp.server.com" class="pure-u-23-24" value="<?= h($formData['smtp_server']) ?>">
                    </div>
                    <div class="pure-u-1 pure-u-md-1-3">
                        <label for="smtp_port">SMTP Port</label>
                        <input id="smtp_port" type="number" name="smtp_port" required placeholder="587" min="1" max="65535" class="pure-u-23-24" value="<?= h($formData['smtp_port']) ?>">
                    </div>
                    <div class="pure-u-1 pure-u-md-1-3">
                        <label for="smtp_encryption">Encryption</label>
                        <select id="smtp_encryption" name="smtp_encryption" required class="pure-input-1-2">
                            <option value="none" <?= selected($formData['smtp_encryption'], 'none') ?>>None</option>
                            <option value="ssl" <?= selected($formData['smtp_encryption'], 'ssl') ?>>SSL</option>
                            <option value="tls" <?= selected($formData['smtp_encryption'], 'tls') ?>>TLS</option>
                        </select>
                    </div>
                    <div class="pure-u-1 pure-u-md-1-3">
                        <label for="smtp_debug">Debug mode</label>
                        <select id="smtp_debug" name="smtp_debug" required class="pure-input-1-2">
                            <option value="0" <?= selected($formData['smtp_debug'], '0') ?>>0 (off)</option>
                            <option value="1" <?= selected($formData['smtp_debug'], '1') ?>>1 (client)</option>
                            <option value="2" <?= selected($formData['smtp_debug'], '2') ?>>2 (server)</option>
                            <option value="3" <?= selected($formData['smtp_debug'], '3') ?>>3 (connection)</option>
                            <option value="4" <?= selected($formData['smtp_debug'], '4') ?>>4 (low level)</option>
                        </select>
                    </div>
                    <div class="pure-u-1 pure-u-md-1-3">
                        <label for="smtp_username">SMTP Username</label>
                        <input id="smtp_username" type="text" name="smtp_username" required class="pure-u-23-24" autocomplete="username" value="<?= h($formData['smtp_username']) ?>">
                    </div>
                    <div class="pure-u-1 pure-u-md-1-3">
                        <label for="smtp_password">SMTP Password</label>
                        <input id="smtp_password" type="password" name="smtp_password" required class="pure-u-23-24" autocomplete="current-password">
                    </div>
                    <div class="pure-u-1 pure-u-md-1-3">
                        <label for="email_from">Email from</label>
                        <input id="email_from" type="email" name="email_from" required class="pure-u-23-24" autocomplete="email" value="<?= h($formData['email_from']) ?>">
                    </div>
                    <div class="pure-u-1 pure-u-md-1-3">
                        <label for="email_to">Email to</label>
                        <input id="email_to" type="email" name="email_to" required class="pure-u-23-24" autocomplete="email" value="<?= h($formData['email_to']) ?>">
                    </div>
                </div>
                <button type="submit" name="smtp" class="pure-button pure-button-primary">Send test email</button>
            </fieldset>
        </form>
    </main>
</body>
</html>