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path: root/login.php
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<?php
include_once $_SERVER['DOCUMENT_ROOT'] . '/lib/partials.php';
include_once $_SERVER['DOCUMENT_ROOT'] . '/lib/utils.php';
include_once $_SERVER['DOCUMENT_ROOT'] . '/lib/config.php';

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $username = $_POST['username'] ?? null;
    $password = $_POST['password'] ?? null;

    if (!isset($username, $password)) {
        exit(json_response(400, 'Username and password must be sent!', null));
    }

    $db = new PDO(DB_URL, DB_USER, DB_PASS);

    $stmt = $db->prepare('SELECT * FROM users WHERE username = ?');
    $stmt->execute([$username]);
    $user = $stmt->fetch(PDO::FETCH_ASSOC) ?: null;

    if (!$user) {
        exit(json_response(401, 'Incorrect username or password.', null));
    }

    if (!password_verify($password, $user['password'])) {
        exit(json_response(401, 'Incorrect username or password.', null));
    }

    $_SESSION['user'] = $user;

    exit(json_response(200, null, $user));
}
?>
<!DOCTYPE html>
<html>

<head>
    <title>id</title>
    <link rel="stylesheet" href="/static/style.css">
</head>

<body>
    <main>
        <?php html_navbar(); ?>

        <form action="/login.php" method="post" class="column gap-16">
            <h1>Log in to your ilt.su account</h1>

            <div class="column">
                <label for="username">Username</label>
                <div>
                    <input type="text" name="username" id="username" pattern="^[a-zA-Z0-9_]+$" required>
                </div>
            </div>
            <div class="column">
                <label for="password">Password</label>
                <div>
                    <input type="password" name="password" id="password" required>
                </div>
            </div>
            <div class="row gap-8 align-bottom">
                <button type="submit">Log in</button>
                <a href="/register.php">Register</a>
            </div>
        </form>
    </main>
</body>

</html>