<?php
/**
 * @package Dotclear
 * @subpackage Backend
 *
 * @copyright Olivier Meunier & Association Dotclear
 * @copyright GPL-2.0-only
 *
 * @var dcCore $core
 */
require dirname(__FILE__) . '/../inc/admin/prepend.php';

# If we have a session cookie, go to index.php
if (isset($_SESSION['sess_user_id'])) {
    $core->adminurl->redirect('admin.home');
}

# Loading locales for detected language
# That's a tricky hack but it works ;)
$dlang = http::getAcceptLanguage();
$dlang = ($dlang == '' ? 'en' : $dlang);
if ($dlang != 'en' && preg_match('/^[a-z]{2}(-[a-z]{2})?$/', $dlang)) {
    l10n::lang($dlang);
    l10n::set(dirname(__FILE__) . '/../locales/' . $dlang . '/main');
}

if (defined('DC_ADMIN_URL')) {
    $page_url = DC_ADMIN_URL . $core->adminurl->get('admin.auth');
} else {
    $page_url = http::getHost() . $_SERVER['REQUEST_URI'];
}

$change_pwd = $core->auth->allowPassChange() && isset($_POST['new_pwd']) && isset($_POST['new_pwd_c']) && isset($_POST['login_data']);
$login_data = !empty($_POST['login_data']) ? html::escapeHTML($_POST['login_data']) : null;
$recover    = $core->auth->allowPassChange() && !empty($_REQUEST['recover']);
$safe_mode  = !empty($_REQUEST['safe_mode']);
$akey       = $core->auth->allowPassChange() && !empty($_GET['akey']) ? $_GET['akey'] : null;
$user_id    = $user_pwd    = $user_key    = $user_email    = null;
$err        = $msg        = null;

# Auto upgrade
if (empty($_GET) && empty($_POST)) {
    require dirname(__FILE__) . '/../inc/dbschema/upgrade.php';

    try {
        if (($changes = dcUpgrade::dotclearUpgrade($core)) !== false) {
            $msg = __('Dotclear has been upgraded.') . '<!-- ' . $changes . ' -->';
        }
    } catch (Exception $e) {
        $err = $e->getMessage();
    }
}

# If we have POST login informations, go throug auth process
if (!empty($_POST['user_id']) && !empty($_POST['user_pwd'])) {
    $user_id  = !empty($_POST['user_id']) ? $_POST['user_id'] : null;
    $user_pwd = !empty($_POST['user_pwd']) ? $_POST['user_pwd'] : null;
}
# If we have COOKIE login informations, go throug auth process
elseif (isset($_COOKIE['dc_admin']) && strlen($_COOKIE['dc_admin']) == 104) {
    # If we have a remember cookie, go through auth process with user_key
    $user_id = substr($_COOKIE['dc_admin'], 40);
    $user_id = @unpack('a32', @pack('H*', $user_id));
    if (is_array($user_id)) {
        $user_id  = trim($user_id[1]);
        $user_key = substr($_COOKIE['dc_admin'], 0, 40);
        $user_pwd = null;
    } else {
        $user_id = null;
    }
}

# Recover password
if ($recover && !empty($_POST['user_id']) && !empty($_POST['user_email'])) {
    $user_id    = !empty($_POST['user_id']) ? $_POST['user_id'] : null;
    $user_email = !empty($_POST['user_email']) ? html::escapeHTML($_POST['user_email']) : '';

    try {
        $recover_key = $core->auth->setRecoverKey($user_id, $user_email);

        $subject = mail::B64Header('Dotclear ' . __('Password reset'));
        $message = __('Someone has requested to reset the password for the following site and username.') . "\n\n" .
        $page_url . "\n" . __('Username:') . ' ' . $user_id . "\n\n" .
        __('To reset your password visit the following address, otherwise just ignore this email and nothing will happen.') . "\n" .
            $page_url . '?akey=' . $recover_key;

        $headers[] = 'From: ' . (defined('DC_ADMIN_MAILFROM') && DC_ADMIN_MAILFROM ? DC_ADMIN_MAILFROM : 'dotclear@local');
        $headers[] = 'Content-Type: text/plain; charset=UTF-8;';

        mail::sendMail($user_email, $subject, $message, $headers);
        $msg = sprintf(__('The e-mail was sent successfully to %s.'), $user_email);
    } catch (Exception $e) {
        $err = $e->getMessage();
    }
}
# Send new password
elseif ($akey) {
    try {
        $recover_res = $core->auth->recoverUserPassword($akey);

        $subject = mb_encode_mimeheader('Dotclear ' . __('Your new password'), 'UTF-8', 'B');
        $message = __('Username:') . ' ' . $recover_res['user_id'] . "\n" .
        __('Password:') . ' ' . $recover_res['new_pass'] . "\n\n" .
        preg_replace('/\?(.*)$/', '', $page_url);

        $headers[] = 'From: ' . (defined('DC_ADMIN_MAILFROM') && DC_ADMIN_MAILFROM ? DC_ADMIN_MAILFROM : 'dotclear@local');
        $headers[] = 'Content-Type: text/plain; charset=UTF-8;';

        mail::sendMail($recover_res['user_email'], $subject, $message, $headers);
        $msg = __('Your new password is in your mailbox.');
    } catch (Exception $e) {
        $err = $e->getMessage();
    }
}
# Change password and retry to log
elseif ($change_pwd) {
    try {
        $tmp_data = explode('/', $_POST['login_data']);
        if (count($tmp_data) != 3) {
            throw new Exception();
        }
        $data = [
            'user_id'       => base64_decode($tmp_data[0]),
            'cookie_admin'  => $tmp_data[1],
            'user_remember' => $tmp_data[2] == '1'
        ];
        if ($data['user_id'] === false) {   // @phpstan-ignore-line
            throw new Exception();
        }

        # Check login informations
        $check_user = false;
        if (isset($data['cookie_admin']) && strlen($data['cookie_admin']) == 104) {
            $user_id = substr($data['cookie_admin'], 40);
            $user_id = @unpack('a32', @pack('H*', $user_id));
            if (is_array($user_id)) {
                $user_id    = trim($data['user_id']);
                $user_key   = substr($data['cookie_admin'], 0, 40);
                $check_user = $core->auth->checkUser($user_id, null, $user_key) === true;
            } else {
                $user_id = trim($user_id);  // @phpstan-ignore-line
            }
        }

        if (!$core->auth->allowPassChange() || !$check_user) {
            $change_pwd = false;

            throw new Exception();
        }

        if ($_POST['new_pwd'] != $_POST['new_pwd_c']) {
            throw new Exception(__("Passwords don't match"));
        }

        if ($core->auth->checkUser($user_id, $_POST['new_pwd']) === true) {
            throw new Exception(__("You didn't change your password."));
        }

        $cur                  = $core->con->openCursor($core->prefix . 'user');
        $cur->user_change_pwd = 0;
        $cur->user_pwd        = $_POST['new_pwd'];
        $core->updUser($core->auth->userID(), $cur);

        $core->session->start();
        $_SESSION['sess_user_id']     = $user_id;
        $_SESSION['sess_browser_uid'] = http::browserUID(DC_MASTER_KEY);

        if ($data['user_remember']) {
            setcookie('dc_admin', $data['cookie_admin'], strtotime('+15 days'), '', '', DC_ADMIN_SSL);
        }

        $core->adminurl->redirect('admin.home');
    } catch (Exception $e) {
        $err = $e->getMessage();
    }
}
# Try to log
elseif ($user_id !== null && ($user_pwd !== null || $user_key !== null)) {
    # We check the user
    $check_user = $core->auth->checkUser($user_id, $user_pwd, $user_key, false) === true;
    if ($check_user) {
        $check_perms = $core->auth->findUserBlog() !== false;
    } else {
        $check_perms = false;
    }

    $cookie_admin = http::browserUID(DC_MASTER_KEY . $user_id .
        $core->auth->cryptLegacy($user_id)) . bin2hex(pack('a32', $user_id));

    if ($check_perms && $core->auth->mustChangePassword()) {
        $login_data = join('/', [
            base64_encode($user_id),
            $cookie_admin,
            empty($_POST['user_remember']) ? '0' : '1'
        ]);

        if (!$core->auth->allowPassChange()) {
            $err = __('You have to change your password before you can login.');
        } else {
            $err        = __('In order to login, you have to change your password now.');
            $change_pwd = true;
        }
    } elseif ($check_perms && !empty($_POST['safe_mode']) && !$core->auth->isSuperAdmin()) {
        $err = __('Safe Mode can only be used for super administrators.');
    } elseif ($check_perms) {
        $core->session->start();
        $_SESSION['sess_user_id']     = $user_id;
        $_SESSION['sess_browser_uid'] = http::browserUID(DC_MASTER_KEY);

        if (!empty($_POST['blog'])) {
            $_SESSION['sess_blog_id'] = $_POST['blog'];
        }

        if (!empty($_POST['safe_mode']) && $core->auth->isSuperAdmin()) {
            $_SESSION['sess_safe_mode'] = true;
        }

        if (!empty($_POST['user_remember'])) {
            setcookie('dc_admin', $cookie_admin, strtotime('+15 days'), '', '', DC_ADMIN_SSL);
        }

        $core->adminurl->redirect('admin.home');
    } else {
        if ($check_user) {
            $err = __('Insufficient permissions');
        } else {
            $err = isset($_COOKIE['dc_admin']) ? __('Administration session expired') : __('Wrong username or password');
        }
        if (isset($_COOKIE['dc_admin'])) {
            unset($_COOKIE['dc_admin']);
            setcookie('dc_admin', '', -600, '', '', DC_ADMIN_SSL);
        }
    }
}

if (isset($_GET['user'])) {
    $user_id = $_GET['user'];
}

header('Content-Type: text/html; charset=UTF-8');

// Prevents Clickjacking as far as possible
header('X-Frame-Options: SAMEORIGIN'); // FF 3.6.9+ Chrome 4.1+ IE 8+ Safari 4+ Opera 10.5+

?>
<!DOCTYPE html>
<html lang="<?php echo $dlang; ?>">
<head>
  <meta charset="UTF-8" />
  <meta http-equiv="Content-Script-Type" content="text/javascript" />
  <meta http-equiv="Content-Style-Type" content="text/css" />
  <meta http-equiv="Content-Language" content="<?php echo $dlang; ?>" />
  <meta name="ROBOTS" content="NOARCHIVE,NOINDEX,NOFOLLOW" />
  <meta name="GOOGLEBOT" content="NOSNIPPET" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title><?php echo html::escapeHTML(DC_VENDOR_NAME); ?></title>
  <link rel="icon" type="image/png" href="images/favicon96-logout.png" />
  <link rel="shortcut icon" href="images/favicon.ico" type="image/x-icon" />


<?php
echo dcPage::jsCommon();
?>

    <link rel="stylesheet" href="style/default.css" type="text/css" media="screen" />

<?php
# --BEHAVIOR-- loginPageHTMLHead
$core->callBehavior('loginPageHTMLHead');

echo
    dcPage::jsJson('pwstrength', [
        'min' => sprintf(__('Password strength: %s'), __('weak')),
        'avg' => sprintf(__('Password strength: %s'), __('medium')),
        'max' => sprintf(__('Password strength: %s'), __('strong'))
    ]) .
    dcPage::jsLoad('js/pwstrength.js') .
    dcPage::jsLoad('js/_auth.js');
?>
</head>

<body id="dotclear-admin" class="auth">

<form action="<?php echo $core->adminurl->get('admin.auth'); ?>" method="post" id="login-screen">
<h1 role="banner"><?php echo html::escapeHTML(DC_VENDOR_NAME); ?></h1>

<?php
if ($err) {
    echo '<div class="' . ($change_pwd ? 'info' : 'error') . '" role="alert">' . $err . '</div>';
}
if ($msg) {
    echo '<p class="success" role="alert">' . $msg . '</p>';
}

if ($akey) {
    echo '<p><a href="' . $core->adminurl->get('admin.auth') . '">' . __('Back to login screen') . '</a></p>';
} elseif ($recover) {
    echo
    '<div class="fieldset" role="main"><h2>' . __('Request a new password') . '</h2>' .
    '<p><label for="user_id">' . __('Username:') . '</label> ' .
    form::field('user_id', 20, 32,
        [
            'default'      => html::escapeHTML($user_id),
            'autocomplete' => 'username'
        ]
    ) .
    '</p>' .

    '<p><label for="user_email">' . __('Email:') . '</label> ' .
    form::email('user_email',
        [
            'default'      => html::escapeHTML($user_email),
            'autocomplete' => 'email'
        ]
    ) .
    '</p>' .

    '<p><input type="submit" value="' . __('recover') . '" />' .
    form::hidden('recover', 1) . '</p>' .
    '</div>' .

    '<details open id="issue">' . "\n" .
    '<summary>' . __('Other option') . '</summary>' . "\n" .
    '<p><a href="' . $core->adminurl->get('admin.auth') . '">' . __('Back to login screen') . '</a></p>' .
    '</details>';
} elseif ($change_pwd) {
    echo
    '<div class="fieldset"><h2>' . __('Change your password') . '</h2>' .
    '<p><label for="new_pwd">' . __('New password:') . '</label> ' .
    form::password('new_pwd', 20, 255,
        [
            'autocomplete' => 'new-password',
            'class'        => 'pw-strength'
        ]
    ) . '</p>' .

    '<p><label for="new_pwd_c">' . __('Confirm password:') . '</label> ' .
    form::password('new_pwd_c', 20, 255,
        [
            'autocomplete' => 'new-password'
        ]
    ) . '</p>' .
    '<p><input type="submit" value="' . __('change') . '" />' .
    form::hidden('login_data', $login_data) . '</p>' .
    '</div>';
} else {
    if (is_callable([$core->auth, 'authForm'])) {
        echo $core->auth->authForm($user_id);
    } else {
        if ($safe_mode) {
            echo '<div class="fieldset" role="main">';
            echo '<h2>' . __('Safe mode login') . '</h2>';
            echo
            '<p class="form-note">' .
            __('This mode allows you to login without activating any of your plugins. This may be useful to solve compatibility problems') . '&nbsp;</p>' .
            '<p class="form-note">' . __('Disable or delete any plugin suspected to cause trouble, then log out and log back in normally.') .
                '</p>';
        } else {
            echo '<div class="fieldset" role="main">';
        }

        echo
        '<p><label for="user_id">' . __('Username:') . '</label> ' .
        form::field('user_id', 20, 32,
            [
                'default'      => html::escapeHTML($user_id),
                'autocomplete' => 'username'
            ]
        ) . '</p>' .

        '<p><label for="user_pwd">' . __('Password:') . '</label> ' .
        form::password('user_pwd', 20, 255,
            [
                'autocomplete' => 'current-password'
            ]
        ) . '</p>' .

        '<p>' .
        form::checkbox('user_remember', 1) .
        '<label for="user_remember" class="classic">' .
        __('Remember my ID on this device') . '</label></p>' .

        '<p><input type="submit" value="' . __('log in') . '" class="login" /></p>';

        if (!empty($_REQUEST['blog'])) {
            echo form::hidden('blog', html::escapeHTML($_REQUEST['blog']));
        }
        if ($safe_mode) {
            echo
            form::hidden('safe_mode', 1) .
                '</div>';
        } else {
            echo '</div>';
        }
        echo
        '<p id="cookie_help" class="error">' . __('You must accept cookies in order to use the private area.') . '</p>';

        echo '<details ' . ($safe_mode ? 'open ' : '') . 'id="issue">' . "\n";
        if ($safe_mode) {
            echo '<summary>' . __('Other option') . '</summary>' . "\n";
            echo
            '<p><a href="' . $core->adminurl->get('admin.auth') . '" id="normal_mode_link">' . __('Get back to normal authentication') . '</a></p>';
        } else {
            echo '<summary>' . __('Connection issue?') . '</summary>' . "\n";
            if ($core->auth->allowPassChange()) {
                echo '<p><a href="' . $core->adminurl->get('admin.auth', ['recover' => 1]) . '">' . __('I forgot my password') . '</a></p>';
            }
            echo '<p><a href="' . $core->adminurl->get('admin.auth', ['safe_mode' => 1]) . '" id="safe_mode_link">' . __('I want to log in in safe mode') . '</a></p>';
        }
        echo '</details>';
    }
}
?>
</form>
</body>
</html>
