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<?php
/**
 * MyBB 1.8
 * Copyright 2014 MyBB Group, All Rights Reserved
 *
 * Website: http://www.mybb.com
 * License: http://www.mybb.com/about/license
 *
 */

define("IN_MYBB", 1);
define("IN_ADMINCP", 1);

// Here you can change how much of an Admin CP IP address must match in a previous session for the user is validated (e.g. 3 means a.b.c need to match)
define("ADMIN_IP_SEGMENTS", 0);
define("ADMIN_IPV6_SEGMENTS", 0);

require_once dirname(dirname(__FILE__))."/inc/init.php";

$shutdown_queries = $shutdown_functions = array();

send_page_headers();

header('X-Frame-Options: SAMEORIGIN');
header('Referrer-Policy: no-referrer');

if(!isset($config['admin_dir']) || !file_exists(MYBB_ROOT.$config['admin_dir']."/inc/class_page.php"))
{
	$config['admin_dir'] = basename(dirname(__FILE__));
}

define('MYBB_ADMIN_DIR', MYBB_ROOT.$config['admin_dir'].'/');

define('COPY_YEAR', my_date('Y', TIME_NOW));

require_once MYBB_ADMIN_DIR."inc/class_page.php";
require_once MYBB_ADMIN_DIR."inc/class_form.php";
require_once MYBB_ADMIN_DIR."inc/class_table.php";
require_once MYBB_ADMIN_DIR."inc/functions.php";
require_once MYBB_ROOT."inc/functions_user.php";

// Set cookie path to our admin dir temporarily, i.e. so that it affects the ACP only
$loc = get_current_location('', '', true);
$mybb->settings['cookiepath'] = substr($loc, 0, strrpos($loc, "/{$config['admin_dir']}/"))."/{$config['admin_dir']}/";

if(!isset($cp_language))
{
	$lang->set_language($mybb->settings['cplanguage'], "admin");
}

// Load global language phrases
$lang->load("global");
$lang->load("messages", true);

if(function_exists('mb_internal_encoding') && !empty($lang->settings['charset']))
{
	@mb_internal_encoding($lang->settings['charset']);
}

header("Content-type: text/html; charset={$lang->settings['charset']}");

$time = TIME_NOW;
$errors = null;

if(is_dir(MYBB_ROOT."install") && !file_exists(MYBB_ROOT."install/lock"))
{
	$mybb->trigger_generic_error("install_directory");
}

$ip_address = get_ip();
unset($user);

// Load Admin CP style
if(!isset($cp_style))
{
	if(!empty($mybb->settings['cpstyle']) && file_exists(MYBB_ADMIN_DIR."/styles/".$mybb->settings['cpstyle']."/main.css"))
	{
		$cp_style = $mybb->settings['cpstyle'];
	}
	else
	{
		$cp_style = "default";
	}
}

$default_page = new DefaultPage;

$logged_out = false;
$fail_check = 0;
$post_verify = true;

foreach(array('action', 'do', 'module') as $input)
{
	if(!isset($mybb->input[$input]))
	{
		$mybb->input[$input] = '';
	}
}

if($mybb->input['action'] == "unlock")
{
	$user = array();
	$error = '';

	$plugins->run_hooks("admin_unlock_start");

	if($mybb->input['username'])
	{
		$user = get_user_by_username($mybb->input['username'], array('fields' => '*'));

		if(!$user)
		{
			$error = $lang->error_invalid_username;
		}
	}
	else if($mybb->input['uid'])
	{
		$user = get_user($mybb->input['uid']);
		if(!$user)
		{
			$error = $lang->error_invalid_uid;
		}
	}

	// Do we have the token? If so let's process it
	if($mybb->input['token'] && $user['uid'])
	{
		$query = $db->simple_select("awaitingactivation", "COUNT(aid) AS num", "uid='".(int)$user['uid']."' AND code='".$db->escape_string($mybb->input['token'])."' AND type='l'");

		$plugins->run_hooks("admin_unlock_end");

		// If we're good to go
		if($db->fetch_field($query, "num") > 0)
		{
			$db->delete_query("awaitingactivation", "uid='".(int)$user['uid']."' AND code='".$db->escape_string($mybb->input['token'])."' AND type='l'");
			$db->update_query("adminoptions", array('loginlockoutexpiry' => 0, 'loginattempts' => 0), "uid='".(int)$user['uid']."'");

			admin_redirect("index.php");
		}
		else
		{
			$error = $lang->error_invalid_token;
		}
	}

	$default_page->show_lockout_unlock($error, 'error');
}
elseif($mybb->input['do'] == "login")
{
	$plugins->run_hooks("admin_login");

	// We have an adminsid cookie?
	if(isset($mybb->cookies['adminsid']))
	{
		// Check admin session
		$query = $db->simple_select("adminsessions", "sid", "sid='".$db->escape_string($mybb->cookies['adminsid'])."'");
		$admin_session = $db->fetch_field($query, 'sid');

		// Session found: redirect to index
		if($admin_session)
		{
			admin_redirect("index.php");
		}
	}

	require_once MYBB_ROOT."inc/datahandlers/login.php";
	$loginhandler = new LoginDataHandler("get");

	// Determine login method
	$login_lang_string = $lang->error_invalid_username_password;
	switch($mybb->settings['username_method'])
	{
		case 0: // Username only
			$login_lang_string = $lang->sprintf($login_lang_string, $lang->login_username);
			break;
		case 1: // Email only
			$login_lang_string = $lang->sprintf($login_lang_string, $lang->login_email);
			break;
		case 2: // Username and email
		default:
			$login_lang_string = $lang->sprintf($login_lang_string, $lang->login_username_and_password);
			break;
	}

	// Validate PIN first
	if(!empty($config['secret_pin']) && (empty($mybb->input['pin']) || $mybb->input['pin'] != $config['secret_pin']))
	{
		$login_user = get_user_by_username($mybb->input['username'], array('fields' => array('email', 'username')));

		$plugins->run_hooks("admin_login_incorrect_pin");

		if($login_user['uid'] > 0)
		{
			$db->update_query("adminoptions", array("loginattempts" => "loginattempts+1"), "uid='".(int)$login_user['uid']."'", '', true);
		}

		$loginattempts = login_attempt_check_acp($login_user['uid'], true);

		// Have we attempted too many times?
		if($loginattempts !== false && $loginattempts['loginattempts'] > 0)
		{
			// Have we set an expiry yet?
			if($loginattempts['loginlockoutexpiry'] == 0)
			{
				$db->update_query("adminoptions", array("loginlockoutexpiry" => TIME_NOW+((int)$mybb->settings['loginattemptstimeout']*60)), "uid='".(int)$login_user['uid']."'");
			}

			// Did we hit lockout for the first time? Send the unlock email to the administrator
			if($loginattempts['loginattempts'] == $mybb->settings['maxloginattempts'])
			{
				$db->delete_query("awaitingactivation", "uid='".(int)$login_user['uid']."' AND type='l'");
				$lockout_array = array(
					"uid" => $login_user['uid'],
					"dateline" => TIME_NOW,
					"code" => random_str(),
					"type" => "l"
				);
				$db->insert_query("awaitingactivation", $lockout_array);

				$subject = $lang->sprintf($lang->locked_out_subject, $mybb->settings['bbname']);
				$message = $lang->sprintf($lang->locked_out_message, htmlspecialchars_uni($mybb->input['username']), $mybb->settings['bbname'], $mybb->settings['maxloginattempts'], $mybb->settings['bburl'], $mybb->config['admin_dir'], $lockout_array['code'], $lockout_array['uid']);
				my_mail($login_user['email'], $subject, $message);
			}

			log_admin_action(array(
					'type' => 'admin_locked_out',
					'uid' => (int)$login_user['uid'],
					'username' => $login_user['username'],
				)
			);

			$default_page->show_lockedout();
		}
		else
		{
			$default_page->show_login($login_lang_string, "error");
		}
	}

	$loginhandler->set_data(array(
		'username' => $mybb->input['username'],
		'password' => $mybb->input['password']
	));

	if($loginhandler->validate_login() == true)
	{
		$mybb->user = get_user($loginhandler->login_data['uid']);
	}

	if(!empty($mybb->user['uid']))
	{
		if(login_attempt_check_acp($mybb->user['uid']) == true)
		{
			log_admin_action(array(
					'type' => 'admin_locked_out',
					'uid' => (int)$mybb->user['uid'],
					'username' => $mybb->user['username'],
				)
			);

			$default_page->show_lockedout();
		}

		$plugins->run_hooks("admin_login_success");

		$db->delete_query("adminsessions", "uid='{$mybb->user['uid']}'");

		$sid = md5(random_str(50));

		$useragent = $_SERVER['HTTP_USER_AGENT'];
		if(my_strlen($useragent) > 200)
		{
			$useragent = my_substr($useragent, 0, 200);
		}

		// Create a new admin session for this user
		$admin_session = array(
			"sid" => $sid,
			"uid" => $mybb->user['uid'],
			"loginkey" => $mybb->user['loginkey'],
			"ip" => $db->escape_binary(my_inet_pton(get_ip())),
			"dateline" => TIME_NOW,
			"lastactive" => TIME_NOW,
			"data" => my_serialize(array()),
			"useragent" => $db->escape_string($useragent),
			"authenticated" => 0,
		);
		$db->insert_query("adminsessions", $admin_session);
		$admin_session['data'] = array();

		// Only reset the loginattempts when we're really logged in and the user doesn't need to enter a 2fa code
		$query = $db->simple_select("adminoptions", "authsecret", "uid='{$mybb->user['uid']}'");
		$admin_options = $db->fetch_array($query);
		if(empty($admin_options['authsecret']))
		{
			$db->update_query("adminoptions", array("loginattempts" => 0, "loginlockoutexpiry" => 0), "uid='{$mybb->user['uid']}'");
		}

		my_setcookie("adminsid", $sid, '', true, "strict");
		my_setcookie('acploginattempts', 0);
		$post_verify = false;

		$mybb->request_method = "get";

		if(!empty($mybb->input['module']))
		{
			// $query_string should contain the module
			$query_string = '?module='.htmlspecialchars_uni($mybb->input['module']);

			// Now we look for any paramters passed in $_SERVER['QUERY_STRING']
			if($_SERVER['QUERY_STRING'])
			{
				$qstring = '?'.preg_replace('#adminsid=(.{32})#i', '', $_SERVER['QUERY_STRING']);
				$qstring = str_replace('action=logout', '', $qstring);
				$qstring = preg_replace('#&+#', '&', $qstring);
				$qstring = str_replace('?&', '?', $qstring);

				// So what do we do? We know that parameters are devided by ampersands
				// That means we must get to work!
				$parameters = explode('&', $qstring);

				// Remove our first member if it's for the module
				if(substr($parameters[0], 0, 8) == '?module=')
				{
					unset($parameters[0]);
				}

				foreach($parameters as $key => $param)
				{
					$params = explode("=", $param);

					$query_string .= '&'.htmlspecialchars_uni($params[0]);

					if(isset($params[1]))
					{
						$query_string .= "=".htmlspecialchars_uni($params[1]);
					}
				}
			}

			admin_redirect("index.php".$query_string);
		}
	}
	else
	{
		$login_user = get_user_by_username($mybb->input['username'], array('fields' => array('email', 'username')));

		$plugins->run_hooks("admin_login_fail");

		$loginattempts = false;
		if(!empty($login_user['uid']) && $login_user['uid'] > 0)
		{
			$db->update_query("adminoptions", array("loginattempts" => "loginattempts+1"), "uid='".(int)$login_user['uid']."'", '', true);
			$loginattempts = login_attempt_check_acp($login_user['uid'], true);
		}

		// Have we attempted too many times?
		if($loginattempts !== false && $loginattempts['loginattempts'] > 0)
		{
			// Have we set an expiry yet?
			if($loginattempts['loginlockoutexpiry'] == 0)
			{
				$db->update_query("adminoptions", array("loginlockoutexpiry" => TIME_NOW+((int)$mybb->settings['loginattemptstimeout']*60)), "uid='".(int)$login_user['uid']."'");
			}

			$plugins->run_hooks("admin_login_lockout");

			// Did we hit lockout for the first time? Send the unlock email to the administrator
			if($loginattempts['loginattempts'] == $mybb->settings['maxloginattempts'])
			{
				$db->delete_query("awaitingactivation", "uid='".(int)$login_user['uid']."' AND type='l'");
				$lockout_array = array(
					"uid" => $login_user['uid'],
					"dateline" => TIME_NOW,
					"code" => random_str(),
					"type" => "l"
				);
				$db->insert_query("awaitingactivation", $lockout_array);

				$subject = $lang->sprintf($lang->locked_out_subject, $mybb->settings['bbname']);
				$message = $lang->sprintf($lang->locked_out_message, htmlspecialchars_uni($mybb->input['username']), $mybb->settings['bbname'], $mybb->settings['maxloginattempts'], $mybb->settings['bburl'], $mybb->config['admin_dir'], $lockout_array['code'], $lockout_array['uid']);
				my_mail($login_user['email'], $subject, $message);
			}

			log_admin_action(array(
					'type' => 'admin_locked_out',
					'uid' => (int)$login_user['uid'],
					'username' => $login_user['username'],
				)
			);

			$default_page->show_lockedout();
		}

		$fail_check = 1;
	}
}
else
{
	// No admin session - show message on the login screen
	if(!isset($mybb->cookies['adminsid']))
	{
		$login_message = "";
	}
	// Otherwise, check admin session
	else
	{
		$query = $db->simple_select("adminsessions", "*", "sid='".$db->escape_string($mybb->cookies['adminsid'])."'");
		$admin_session = $db->fetch_array($query);

		// No matching admin session found - show message on login screen
		if(empty($admin_session) || !$admin_session['sid'])
		{
			$login_message = $lang->error_invalid_admin_session;
		}
		else
		{
			$admin_session['data'] = my_unserialize($admin_session['data']);

			// Fetch the user from the admin session
			$mybb->user = get_user($admin_session['uid']);

			// Login key has changed - force logout
			if(!$mybb->user['uid'] || $mybb->user['loginkey'] !== $admin_session['loginkey'])
			{
				unset($mybb->user);
			}
			else
			{
				// Admin CP sessions 2 hours old are expired
				if($admin_session['lastactive'] < TIME_NOW-7200)
				{
					$login_message = $lang->error_admin_session_expired;
					$db->delete_query("adminsessions", "sid='".$db->escape_string($mybb->cookies['adminsid'])."'");
					unset($mybb->user);
				}
				// If IP matching is set - check IP address against the session IP
				else if(ADMIN_IP_SEGMENTS > 0 && strpos($ip_address, ':') === false)
				{
					$exploded_ip = explode(".", $ip_address);
					$exploded_admin_ip = explode(".", my_inet_ntop($admin_session['ip']));
					$matches = 0;
					$valid_ip = false;
					for($i = 0; $i < ADMIN_IP_SEGMENTS; ++$i)
					{
						if($exploded_ip[$i] == $exploded_admin_ip[$i])
						{
							++$matches;
						}
						if($matches == ADMIN_IP_SEGMENTS)
						{
							$valid_ip = true;
							break;
						}
					}

					// IP doesn't match properly - show message on logon screen
					if(!$valid_ip)
					{
						$login_message = $lang->error_invalid_ip;
						unset($mybb->user);
					}
				}
				else if(ADMIN_IPV6_SEGMENTS > 0 && strpos($ip_address, ':') !== false)
				{
					// Expand IPv6 addresses
					$hex = unpack("H*hex", my_inet_pton($ip_address));
					$expanded_ip = substr(preg_replace("/([A-f0-9]{4})/", "$1:", $hex['hex']), 0, -1);
					$hex_admin = unpack("H*hex", $admin_session['ip']);
					$expanded_admin_ip = substr(preg_replace("/([A-f0-9]{4})/", "$1:", $hex_admin['hex']), 0, -1);

					$exploded_ip = explode(":", $expanded_ip);
					$exploded_admin_ip = explode(":", $expanded_admin_ip);
					$matches = 0;
					$valid_ip = false;
					for($i = 0; $i < ADMIN_IPV6_SEGMENTS; ++$i)
					{
						if($exploded_ip[$i] == $exploded_admin_ip[$i])
						{
							++$matches;
						}
						if($matches == ADMIN_IPV6_SEGMENTS)
						{
							$valid_ip = true;
							break;
						}
					}

					// IP doesn't match properly - show message on logon screen
					if(!$valid_ip)
					{
						$login_message = $lang->error_invalid_ip;
						unset($mybb->user);
					}
				}
			}
		}
	}
}

if($mybb->input['action'] == "logout" && $mybb->user)
{
	$plugins->run_hooks("admin_logout");

	if(verify_post_check($mybb->get_input('my_post_key')))
	{
		$db->delete_query("adminsessions", "sid='".$db->escape_string($mybb->cookies['adminsid'])."'");
		my_unsetcookie('adminsid');
		$logged_out = true;
	}
}

if(!isset($mybb->user['usergroup']))
{
	$mybbgroups = 1;
}
else
{
	$mybbgroups = $mybb->user['usergroup'].",".$mybb->user['additionalgroups'];
}
$mybb->usergroup = usergroup_permissions($mybbgroups);

$is_super_admin = false;
if(isset($mybb->user['uid']))
{
	$is_super_admin = is_super_admin($mybb->user['uid']);
}

if(empty($mybb->usergroup['cancp']) && !$is_super_admin || !$mybb->user['uid'])
{
	$uid = 0;
	if(isset($mybb->user['uid']))
	{
		$uid = (int)$mybb->user['uid'];
	}
	$db->delete_query("adminsessions", "uid = '{$uid}'");
	unset($mybb->user);
	my_unsetcookie('adminsid');
	if($mybb->get_input('do') == 'login')
	{
		$login_message = $lang->error_mybb_not_admin_account;
	}
}

if(!empty($mybb->user['uid']))
{
	$query = $db->simple_select("adminoptions", "*", "uid='".$mybb->user['uid']."'");
	$admin_options = $db->fetch_array($query);

	// Only update language / theme once fully authenticated
	if(empty($admin_options['authsecret']) || $admin_session['authenticated'] == 1)
	{
		if(!empty($admin_options['cplanguage']))
		{
			$cp_language = $admin_options['cplanguage'];
			$lang->set_language($cp_language, "admin");
			$lang->load("global"); // Reload global language vars
			$lang->load("messages", true);
		}

		if(!empty($admin_options['cpstyle']) && file_exists(MYBB_ADMIN_DIR."/styles/{$admin_options['cpstyle']}/main.css"))
		{
			$cp_style = $admin_options['cpstyle'];
		}
	}

	// Update the session information in the DB
	if($admin_session['sid'])
	{
		$db->update_query("adminsessions", array('lastactive' => TIME_NOW, 'ip' => $db->escape_binary(my_inet_pton(get_ip()))), "sid='".$db->escape_string($admin_session['sid'])."'");
	}

	// Fetch administrator permissions
	$mybb->admin['permissions'] = get_admin_permissions($mybb->user['uid']);
}

// Include the layout generation class overrides for this style
if(file_exists(MYBB_ADMIN_DIR."/styles/{$cp_style}/style.php"))
{
	require_once MYBB_ADMIN_DIR."/styles/{$cp_style}/style.php";
}

// Check if any of the layout generation classes we can override exist in the style file
$classes = array(
	"Page" => "DefaultPage",
	"SidebarItem" => "DefaultSidebarItem",
	"PopupMenu" => "DefaultPopupMenu",
	"Table" => "DefaultTable",
	"Form" => "DefaultForm",
	"FormContainer" => "DefaultFormContainer"
);
foreach($classes as $style_name => $default_name)
{
	// Style does not have this layout generation class, create it
	if(!class_exists($style_name))
	{
		eval("class {$style_name} extends {$default_name} { }");
	}
}

$page = new Page;
$page->style = $cp_style;

// Do not have a valid Admin user, throw back to login page.
if(!isset($mybb->user['uid']) || $logged_out == true)
{
	if($logged_out == true)
	{
		$page->show_login($lang->success_logged_out);
	}
	elseif($fail_check == 1)
	{
		$page->show_login($login_lang_string, "error");
	}
	else
	{
		// If we have this error while retreiving it from an AJAX request, then send back a nice error
		if(isset($mybb->input['ajax']) && $mybb->input['ajax'] == 1)
		{
			echo json_encode(array("errors" => array("login")));
			exit;
		}
		$page->show_login($login_message, "error");
	}
}

// Time to check for Two-Factor Authentication
// First: are we trying to verify a code?
if($mybb->input['do'] == "do_2fa" && $mybb->request_method == "post")
{
	// Test whether it's a recovery code
	$recovery = false;
	$codes = my_unserialize($admin_options['recovery_codes']);
	if(!empty($codes) && in_array($mybb->get_input('code'), $codes))
	{
		$recovery = true;
		$ncodes = array_diff($codes, array($mybb->input['code'])); // Removes our current code from the codes array
		$db->update_query("adminoptions", array("recovery_codes" => $db->escape_string(my_serialize($ncodes))), "uid='{$mybb->user['uid']}'");

		if(count($ncodes) == 0)
		{
			flash_message($lang->my2fa_no_codes, "error");
		}
	}

	// Validate the code
	require_once MYBB_ROOT."inc/3rdparty/2fa/GoogleAuthenticator.php";
	$auth = new PHPGangsta_GoogleAuthenticator;

	$test = $auth->verifyCode($admin_options['authsecret'], $mybb->get_input('code'));

	// Either the code was okay or it was a recovery code
	if($test === true || $recovery === true)
	{
		// Correct code -> session authenticated
		$db->update_query("adminsessions", array("authenticated" => 1), "sid='".$db->escape_string($mybb->cookies['adminsid'])."'");
		$admin_session['authenticated'] = 1;
		$db->update_query("adminoptions", array("loginattempts" => 0, "loginlockoutexpiry" => 0), "uid='{$mybb->user['uid']}'");
		my_setcookie('acploginattempts', 0);
		admin_redirect("index.php");
	}
	else
	{
		// Wrong code -> close session (aka logout)
		$db->delete_query("adminsessions", "sid='".$db->escape_string($mybb->cookies['adminsid'])."'");
		my_unsetcookie('adminsid');

		// Now test whether we need to lock this guy completly
		$db->update_query("adminoptions", array("loginattempts" => "loginattempts+1"), "uid='{$mybb->user['uid']}'", '', true);

		$loginattempts = login_attempt_check_acp($mybb->user['uid'], true);

		// Have we attempted too many times?
		if($loginattempts !== false && $loginattempts['loginattempts'] > 0)
		{
			// Have we set an expiry yet?
			if($loginattempts['loginlockoutexpiry'] == 0)
			{
				$db->update_query("adminoptions", array("loginlockoutexpiry" => TIME_NOW+((int)$mybb->settings['loginattemptstimeout']*60)), "uid='{$mybb->user['uid']}'");
 			}

			// Did we hit lockout for the first time? Send the unlock email to the administrator
			if($loginattempts['loginattempts'] == $mybb->settings['maxloginattempts'])
			{
				$db->delete_query("awaitingactivation", "uid='{$mybb->user['uid']}' AND type='l'");
				$lockout_array = array(
					"uid" => $mybb->user['uid'],
					"dateline" => TIME_NOW,
					"code" => random_str(),
					"type" => "l"
				);
				$db->insert_query("awaitingactivation", $lockout_array);

				$subject = $lang->sprintf($lang->locked_out_subject, $mybb->settings['bbname']);
				$message = $lang->sprintf($lang->locked_out_message, htmlspecialchars_uni($mybb->user['username']), $mybb->settings['bbname'], $mybb->settings['maxloginattempts'], $mybb->settings['bburl'], $mybb->config['admin_dir'], $lockout_array['code'], $lockout_array['uid']);
				my_mail($mybb->user['email'], $subject, $message);
			}

			log_admin_action(array(
					'type' => 'admin_locked_out',
					'uid' => $mybb->user['uid'],
					'username' => $mybb->user['username'],
				)
			);

			$page->show_lockedout();
		}

		// Still here? Show a custom login page
		$page->show_login($lang->my2fa_failed, "error");
	}
}

// Show our 2FA page
if(!empty($admin_options['authsecret']) && $admin_session['authenticated'] != 1)
{
	$page->show_2fa();
}

$page->add_breadcrumb_item($lang->home, "index.php");

// Begin dealing with the modules
$modules_dir = MYBB_ADMIN_DIR."modules";
$dir = opendir($modules_dir);
while(($module = readdir($dir)) !== false)
{
	if(is_dir($modules_dir."/".$module) && !in_array($module, array(".", "..")) && file_exists($modules_dir."/".$module."/module_meta.php"))
	{
		require_once $modules_dir."/".$module."/module_meta.php";

		// Need to always load it for admin permissions / quick access
		$lang->load($module."_module_meta", false, true);

		$has_permission = false;
		if(function_exists($module."_admin_permissions"))
		{
			if(isset($mybb->admin['permissions'][$module]) || $is_super_admin == true)
			{
				$has_permission = true;
			}
		}
		// This module doesn't support permissions
		else
		{
			$has_permission = true;
		}

		// Do we have permissions to run this module (Note: home is accessible by all)
		if($module == "home" || $has_permission == true)
		{
			$meta_function = $module."_meta";
			$initialized = $meta_function();
			if($initialized == true)
			{
				$modules[$module] = 1;
			}
		}
		else
		{
			$modules[$module] = 0;
		}
	}
}

$modules = $plugins->run_hooks("admin_tabs", $modules);

closedir($dir);

if(strpos($mybb->input['module'], "/") !== false)
{
	$current_module = explode("/", $mybb->input['module'], 2);
}
else
{
	$current_module = explode("-", $mybb->input['module'], 2);
}

if(!isset($current_module[1]))
{
	$current_module[1] = 'home';
}

if($mybb->input['module'] && isset($modules[$current_module[0]]))
{
	$run_module = $current_module[0];
}
else
{
	$run_module = "home";
}

$action_handler = $run_module."_action_handler";
$action_file = $action_handler($current_module[1]);

// Set our POST validation code here
$mybb->post_code = generate_post_check();

if($run_module != "home")
{
	check_admin_permissions(array('module' => $page->active_module, 'action' => $page->active_action));
}

// Only POST actions with a valid post code can modify information. Here we check if the incoming request is a POST and if that key is valid.
$post_check_ignores = array(
	"example/page" => array("action")
); // An array of modules/actions to ignore POST checks for.

if($mybb->request_method == "post")
{
	if(in_array($mybb->input['module'], $post_check_ignores))
	{
		$k = array_search($mybb->input['module'], $post_check_ignores);
		if(in_array($mybb->input['action'], $post_check_ignores[$k]))
		{
			$post_verify = false;
		}
	}

	if($post_verify == true)
	{
		// If the post key does not match we switch the action to GET and set a message to show the user
		if(!verify_post_check($mybb->get_input('my_post_key'), true))
		{
			$mybb->request_method = "get";
			$page->show_post_verify_error = true;
		}
	}
}

$lang->load("{$run_module}_{$page->active_action}", false, true);

$plugins->run_hooks("admin_load");

require $modules_dir."/".$run_module."/".$action_file;

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