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<?php

/**
 * This, as you have probably guessed, is the crux on which SMF functions.
 * Everything should start here, so all the setup and security is done
 * properly.  The most interesting part of this file is the action array in
 * the smf_main() function.  It is formatted as so:
 *  'action-in-url' => array('Source-File.php', 'FunctionToCall'),
 *
 * Then, you can access the FunctionToCall() function from Source-File.php
 * with the URL index.php?action=action-in-url.  Relatively simple, no?
 *
 * Simple Machines Forum (SMF)
 *
 * @package SMF
 * @author Simple Machines https://www.simplemachines.org
 * @copyright 2020 Simple Machines and individual contributors
 * @license https://www.simplemachines.org/about/smf/license.php BSD
 *
 * @version 2.1 RC2
 */

// Get everything started up...
define('SMF', 1);
define('SMF_VERSION', '2.1 RC2');
define('SMF_FULL_VERSION', 'SMF ' . SMF_VERSION);
define('SMF_SOFTWARE_YEAR', '2020');

define('JQUERY_VERSION', '3.4.1');
define('POSTGRE_TITLE', 'PostgreSQL');
define('MYSQL_TITLE', 'MySQL');
define('SMF_USER_AGENT', 'Mozilla/5.0 (' . php_uname('s') . ' ' . php_uname('m') . ') AppleWebKit/605.1.15 (KHTML, like Gecko)  SMF/' . strtr(SMF_VERSION, ' ', '.'));

error_reporting(E_ALL);
if (!defined('TIME_START'))
    define('TIME_START', microtime(true));

// This makes it so headers can be sent!
ob_start();

// Do some cleaning, just in case.
foreach (array('db_character_set', 'cachedir') as $variable)
    unset($GLOBALS[$variable]);

// Load the settings...
require_once(dirname(__FILE__) . '/Settings.php');

// Ensure there are no trailing slashes in these variables.
foreach (array('boardurl', 'boarddir', 'sourcedir', 'packagesdir', 'taskddir', 'cachedir') as $variable)
    if (!empty($GLOBALS[$variable]))
        $GLOBALS[$variable] = rtrim($GLOBALS[$variable], "\\/");

// Make absolutely sure the cache directory is defined and writable.
if (empty($cachedir) || !is_dir($cachedir) || !is_writable($cachedir))
{
    if (is_dir($boarddir . '/cache') && is_writable($boarddir . '/cache'))
        $cachedir = $boarddir . '/cache';
    else
    {
        $cachedir = sys_get_temp_dir() . '/smf_cache_' . md5($boarddir);
        @mkdir($cachedir, 0750);
    }
}

// Without those we can't go anywhere
require_once($sourcedir . '/QueryString.php');
require_once($sourcedir . '/Subs.php');
require_once($sourcedir . '/Subs-Auth.php');
require_once($sourcedir . '/Errors.php');
require_once($sourcedir . '/Load.php');

// If $maintenance is set specifically to 2, then we're upgrading or something.
if (!empty($maintenance) &&  2 === $maintenance)
    display_maintenance_message();

// Create a variable to store some SMF specific functions in.
$smcFunc = array();

// Initiate the database connection and define some database functions to use.
loadDatabase();

// Load the settings from the settings table, and perform operations like optimizing.
$context = array();
reloadSettings();
// Clean the request variables, add slashes, etc.
cleanRequest();

// Seed the random generator.
if (empty($modSettings['rand_seed']) || mt_rand(1, 250) == 69)
    smf_seed_generator();

// Before we get carried away, are we doing a scheduled task? If so save CPU cycles by jumping out!
if (isset($_GET['scheduled']))
{
    require_once($sourcedir . '/ScheduledTasks.php');
    AutoTask();
}

// And important includes.
require_once($sourcedir . '/Session.php');
require_once($sourcedir . '/Logging.php');
require_once($sourcedir . '/Security.php');
require_once($sourcedir . '/Class-BrowserDetect.php');

// Check if compressed output is enabled, supported, and not already being done.
if (!empty($modSettings['enableCompressedOutput']) && !headers_sent())
{
    // If zlib is being used, turn off output compression.
    if (ini_get('zlib.output_compression') >= 1 || ini_get('output_handler') == 'ob_gzhandler')
        $modSettings['enableCompressedOutput'] = '0';
    else
    {
        ob_end_clean();
        ob_start('ob_gzhandler');
    }
}

/**
 * An autoloader for certain classes.
 *
 * @param string $class The fully-qualified class name.
 */
spl_autoload_register(function ($class) use ($sourcedir)
{
    $classMap = array(
        'ReCaptcha\\' => 'ReCaptcha/',
        'MatthiasMullie\\Minify\\' => 'minify/src/',
        'MatthiasMullie\\PathConverter\\' => 'minify/path-converter/src/',
    );

    // Do any third-party scripts want in on the fun?
    call_integration_hook('integrate_autoload', array(&$classMap));

    foreach ($classMap as $prefix => $dirName)
    {
        // does the class use the namespace prefix?
        $len = strlen($prefix);
        if (strncmp($prefix, $class, $len) !== 0)
        {
            continue;
        }

        // get the relative class name
        $relativeClass = substr($class, $len);

        // replace the namespace prefix with the base directory, replace namespace
        // separators with directory separators in the relative class name, append
        // with .php
        $fileName = $dirName . strtr($relativeClass, '\\', '/') . '.php';

        // if the file exists, require it
        if (file_exists($fileName = $sourcedir . '/' . $fileName))
        {
            require_once $fileName;

            return;
        }
    }
});

// Register an error handler.
set_error_handler('smf_error_handler');

// Start the session. (assuming it hasn't already been.)
loadSession();

// What function shall we execute? (done like this for memory's sake.)
call_user_func(smf_main());

// Call obExit specially; we're coming from the main area ;).
obExit(null, null, true);

/**
 * The main dispatcher.
 * This delegates to each area.
 *
 * @return array|string|void An array containing the file to include and name of function to call, the name of a function to call or dies with a fatal_lang_error if we couldn't find anything to do.
 */
function smf_main()
{
    global $modSettings, $settings, $user_info, $board, $topic;
    global $board_info, $maintenance, $sourcedir, $should_log;

    // Special case: session keep-alive, output a transparent pixel.
    if (isset($_GET['action']) && $_GET['action'] == 'keepalive')
    {
        header('content-type: image/gif');
        die("\x47\x49\x46\x38\x39\x61\x01\x00\x01\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x21\xF9\x04\x01\x00\x00\x00\x00\x2C\x00\x00\x00\x00\x01\x00\x01\x00\x00\x02\x02\x44\x01\x00\x3B");
    }

    // We should set our security headers now.
    frameOptionsHeader();

    // Load the user's cookie (or set as guest) and load their settings.
    loadUserSettings();

    // Load the current board's information.
    loadBoard();

    // Load the current user's permissions.
    loadPermissions();

    // Attachments don't require the entire theme to be loaded.
    if (isset($_REQUEST['action']) && $_REQUEST['action'] == 'dlattach' && empty($maintenance))
        detectBrowser();
    // Load the current theme.  (note that ?theme=1 will also work, may be used for guest theming.)
    else
        loadTheme();

    // Check if the user should be disallowed access.
    is_not_banned();

    // If we are in a topic and don't have permission to approve it then duck out now.
    if (!empty($topic) && empty($board_info['cur_topic_approved']) && !allowedTo('approve_posts') && ($user_info['id'] != $board_info['cur_topic_starter'] || $user_info['is_guest']))
        fatal_lang_error('not_a_topic', false);

    // Do some logging, unless this is an attachment, avatar, toggle of editor buttons, theme option, XML feed, popup, etc.
    $no_stat_actions = array(
        'about:unknown' => true,
        'clock' => true,
        'dlattach' => true,
        'findmember' => true,
        'helpadmin' => true,
        'jsoption' => true,
        'likes' => true,
        'loadeditorlocale' => true,
        'modifycat' => true,
        'pm' => array('sa' => array('popup')),
        'profile' => array('area' => array('popup', 'alerts_popup')),
        'requestmembers' => true,
        'smstats' => true,
        'suggest' => true,
        'verificationcode' => true,
        'viewquery' => true,
        'viewsmfile' => true,
        'xmlhttp' => true,
        '.xml' => true,
    );
    call_integration_hook('integrate_pre_log_stats', array(&$no_stat_actions));

    $should_log = true;
    if (isset($_REQUEST['action']) && isset($no_stat_actions[$_REQUEST['action']]))
    {
        if (is_array($no_stat_actions[$_REQUEST['action']]))
        {
            foreach ($no_stat_actions[$_REQUEST['action']] as $subtype => $subnames)
            {
                if (isset($_REQUEST[$subtype]) && in_array($_REQUEST[$subtype], $subnames))
                {
                    $should_log = false;
                    break;
                }
            }
        }
        else
            $should_log = empty($no_stat_actions[$_REQUEST['action']]);
    }
    if ($should_log)
    {
        // Log this user as online.
        writeLog();

        // Track forum statistics and hits...?
        if (!empty($modSettings['hitStats']))
            trackStats(array('hits' => '+'));
    }
    unset($no_stat_actions);

    // Make sure that our scheduled tasks have been running as intended
    check_cron();

    // Is the forum in maintenance mode? (doesn't apply to administrators.)
    if (!empty($maintenance) && !allowedTo('admin_forum'))
    {
        // You can only login.... otherwise, you're getting the "maintenance mode" display.
        if (isset($_REQUEST['action']) && (in_array($_REQUEST['action'], array('login2', 'logintfa', 'logout'))))
        {
            require_once($sourcedir . '/LogInOut.php');
            return ($_REQUEST['action'] == 'login2' ? 'Login2' : ($_REQUEST['action'] == 'logintfa' ? 'LoginTFA' : 'Logout'));
        }
        // Don't even try it, sonny.
        else
            return 'InMaintenance';
    }
    // If guest access is off, a guest can only do one of the very few following actions.
    elseif (empty($modSettings['allow_guestAccess']) && $user_info['is_guest'] && (!isset($_REQUEST['action']) || !in_array($_REQUEST['action'], array('coppa', 'login', 'login2', 'logintfa', 'reminder', 'activate', 'help', 'helpadmin', 'smstats', 'verificationcode', 'signup', 'signup2'))))
        return 'KickGuest';
    elseif (empty($_REQUEST['action']))
    {
        // Action and board are both empty... BoardIndex! Unless someone else wants to do something different.
        if (empty($board) && empty($topic))
        {
            if (!empty($modSettings['integrate_default_action']))
            {
                $defaultAction = explode(',', $modSettings['integrate_default_action']);

                // Sorry, only one default action is needed.
                $defaultAction = $defaultAction[0];

                $call = call_helper($defaultAction, true);

                if (!empty($call))
                    return $call;
            }

            // No default action huh? then go to our good old BoardIndex.
            else
            {
                require_once($sourcedir . '/BoardIndex.php');

                return 'BoardIndex';
            }
        }

        // Topic is empty, and action is empty.... MessageIndex!
        elseif (empty($topic))
        {
            require_once($sourcedir . '/MessageIndex.php');
            return 'MessageIndex';
        }

        // Board is not empty... topic is not empty... action is empty.. Display!
        else
        {
            require_once($sourcedir . '/Display.php');
            return 'Display';
        }
    }

    // Here's the monstrous $_REQUEST['action'] array - $_REQUEST['action'] => array($file, $function).
    $actionArray = array(
        'activate' => array('Register.php', 'Activate'),
        'admin' => array('Admin.php', 'AdminMain'),
        'announce' => array('Post.php', 'AnnounceTopic'),
        'attachapprove' => array('ManageAttachments.php', 'ApproveAttach'),
        'buddy' => array('Subs-Members.php', 'BuddyListToggle'),
        'calendar' => array('Calendar.php', 'CalendarMain'),
        'clock' => array('Calendar.php', 'clock'),
        'coppa' => array('Register.php', 'CoppaForm'),
        'credits' => array('Who.php', 'Credits'),
        'deletemsg' => array('RemoveTopic.php', 'DeleteMessage'),
        'dlattach' => array('ShowAttachments.php', 'showAttachment'),
        'editpoll' => array('Poll.php', 'EditPoll'),
        'editpoll2' => array('Poll.php', 'EditPoll2'),
        'findmember' => array('Subs-Auth.php', 'JSMembers'),
        'groups' => array('Groups.php', 'Groups'),
        'help' => array('Help.php', 'ShowHelp'),
        'helpadmin' => array('Help.php', 'ShowAdminHelp'),
        'jsmodify' => array('Post.php', 'JavaScriptModify'),
        'jsoption' => array('Themes.php', 'SetJavaScript'),
        'likes' => array('Likes.php', 'Likes::call#'),
        'loadeditorlocale' => array('Subs-Editor.php', 'loadLocale'),
        'lock' => array('Topic.php', 'LockTopic'),
        'lockvoting' => array('Poll.php', 'LockVoting'),
        'login' => array('LogInOut.php', 'Login'),
        'login2' => array('LogInOut.php', 'Login2'),
        'logintfa' => array('LogInOut.php', 'LoginTFA'),
        'logout' => array('LogInOut.php', 'Logout'),
        'markasread' => array('Subs-Boards.php', 'MarkRead'),
        'mergetopics' => array('SplitTopics.php', 'MergeTopics'),
        'mlist' => array('Memberlist.php', 'Memberlist'),
        'moderate' => array('ModerationCenter.php', 'ModerationMain'),
        'modifycat' => array('ManageBoards.php', 'ModifyCat'),
        'movetopic' => array('MoveTopic.php', 'MoveTopic'),
        'movetopic2' => array('MoveTopic.php', 'MoveTopic2'),
        'notify' => array('Notify.php', 'Notify'),
        'notifyboard' => array('Notify.php', 'BoardNotify'),
        'notifytopic' => array('Notify.php', 'TopicNotify'),
        'pm' => array('PersonalMessage.php', 'MessageMain'),
        'post' => array('Post.php', 'Post'),
        'post2' => array('Post.php', 'Post2'),
        'printpage' => array('Printpage.php', 'PrintTopic'),
        'profile' => array('Profile.php', 'ModifyProfile'),
        'quotefast' => array('Post.php', 'QuoteFast'),
        'quickmod' => array('MessageIndex.php', 'QuickModeration'),
        'quickmod2' => array('Display.php', 'QuickInTopicModeration'),
        'recent' => array('Recent.php', 'RecentPosts'),
        'reminder' => array('Reminder.php', 'RemindMe'),
        'removepoll' => array('Poll.php', 'RemovePoll'),
        'removetopic2' => array('RemoveTopic.php', 'RemoveTopic2'),
        'reporttm' => array('ReportToMod.php', 'ReportToModerator'),
        'requestmembers' => array('Subs-Auth.php', 'RequestMembers'),
        'restoretopic' => array('RemoveTopic.php', 'RestoreTopic'),
        'search' => array('Search.php', 'PlushSearch1'),
        'search2' => array('Search.php', 'PlushSearch2'),
        'sendactivation' => array('Register.php', 'SendActivation'),
        'signup' => array('Register.php', 'Register'),
        'signup2' => array('Register.php', 'Register2'),
        'smstats' => array('Stats.php', 'SMStats'),
        'suggest' => array('Subs-Editor.php', 'AutoSuggestHandler'),
        'spellcheck' => array('Subs-Post.php', 'SpellCheck'),
        'splittopics' => array('SplitTopics.php', 'SplitTopics'),
        'stats' => array('Stats.php', 'DisplayStats'),
        'sticky' => array('Topic.php', 'Sticky'),
        'theme' => array('Themes.php', 'ThemesMain'),
        'trackip' => array('Profile-View.php', 'trackIP'),
        'about:unknown' => array('Likes.php', 'BookOfUnknown'),
        'unread' => array('Recent.php', 'UnreadTopics'),
        'unreadreplies' => array('Recent.php', 'UnreadTopics'),
        'uploadAttach' => array('Attachments.php', 'Attachments::call#'),
        'verificationcode' => array('Register.php', 'VerificationCode'),
        'viewprofile' => array('Profile.php', 'ModifyProfile'),
        'vote' => array('Poll.php', 'Vote'),
        'viewquery' => array('ViewQuery.php', 'ViewQuery'),
        'viewsmfile' => array('Admin.php', 'DisplayAdminFile'),
        'who' => array('Who.php', 'Who'),
        '.xml' => array('News.php', 'ShowXmlFeed'),
        'xmlhttp' => array('Xml.php', 'XMLhttpMain'),
    );

    // Allow modifying $actionArray easily.
    call_integration_hook('integrate_actions', array(&$actionArray));

    // Get the function and file to include - if it's not there, do the board index.
    if (!isset($_REQUEST['action']) || !isset($actionArray[$_REQUEST['action']]))
    {
        // Catch the action with the theme?
        if (!empty($settings['catch_action']))
        {
            require_once($sourcedir . '/Themes.php');
            return 'WrapAction';
        }

        if (!empty($modSettings['integrate_fallback_action']))
        {
            $fallbackAction = explode(',', $modSettings['integrate_fallback_action']);

            // Sorry, only one fallback action is needed.
            $fallbackAction = $fallbackAction[0];

            $call = call_helper($fallbackAction, true);

            if (!empty($call))
                return $call;
        }

        // No fallback action, huh?
        else
        {
            fatal_lang_error('not_found', false, array(), 404);
        }
    }

    // Otherwise, it was set - so let's go to that action.
    if (!empty($actionArray[$_REQUEST['action']][0]))
        require_once($sourcedir . '/' . $actionArray[$_REQUEST['action']][0]);

    // Do the right thing.
    return call_helper($actionArray[$_REQUEST['action']][1], true);
}

?>