<?php
/**
 * Contains all the functions used to validate the current logged in
 * client or user.
 *
 * @package ProjectSend
 *
 */

$database->MySQLDB();

/**
 * Used when checking if there is a client or user logged in via cookie.
 *
 * @see check_for_session
 */
function check_valid_cookie()
{
	if (isset($_COOKIE['password']) && isset($_COOKIE['loggedin']) && isset($_COOKIE['userlevel'])) {
		$cookie_pass = mysql_real_escape_string($_COOKIE['password']);
		$cookie_user = mysql_real_escape_string($_COOKIE['loggedin']);
		$cookie_level = mysql_real_escape_string($_COOKIE['userlevel']);
		if($cookie_level == '0') {
			$sql_cookie = mysql_query("SELECT * FROM tbl_clients WHERE client_user='$cookie_user' AND password='$cookie_pass'");
		}
		else {
			$sql_cookie = mysql_query("SELECT * FROM tbl_users WHERE user='$cookie_user' AND password='$cookie_pass' AND level='$cookie_level'");
		}
		$count = mysql_num_rows($sql_cookie);
		if($count>0){
			return true;
		}
	}
}

/**
 * Used on header.php to check if there is an active session or valid
 * cookie before generating the content.
 * If none is found, redirect to the log in form.
 */
function check_for_session()
{
	$is_logged_now = false;
	if (isset($_SESSION['loggedin'])) {
		$is_logged_now = true;
	}
	elseif (isset($_SESSION['access']) && $_SESSION['access'] == 'admin') {
		$is_logged_now = true;
	}
	elseif (check_valid_cookie()) {
		$is_logged_now = true;
	}
	if(!$is_logged_now) {
		header("location:index.php");
	}
}

/**
 * Used on header.php to check if the current logged in account is either
 * a system user or a client.
 *
 * Clients are then redirected to the index page, where another check is
 * performed and then a second redirection takes the client to the
 * correspondent file list.
 *
 * @see check_for_client
 */
function check_for_admin() {
	$is_logged_admin = false;
	if (isset($_SESSION['access']) && $_SESSION['access'] == 'admin') {
		$is_logged_admin = true;
	}
	elseif (check_valid_cookie() && mysql_real_escape_string($_COOKIE['access']) == 'admin') {
		$is_logged_admin = true;
	}
	if(!$is_logged_admin) {
		header("location:index.php");
	}
}

/**
 * Used on the log in form page (index.php) to take the clients directly to their
 * files list.
 *
 * The client username (which corresponds to it's unique folder and URI)
 * is gotten either from the active session, or the saved cookie information.
 */
function check_for_client() {
	if (isset($_SESSION['userlevel']) && $_SESSION['userlevel'] == '0') {
		$client_username = $_SESSION['access'];
		header("location:upload/$client_username/");
	}
	if (isset($_COOKIE['userlevel']) && $_COOKIE['userlevel'] == '0') {
		$client_username = $_COOKIE['access'];
		header("location:upload/$client_username/");
	}
}

/**
 * Used on header.php to check if the current logged in system user has the
 * permission to view this page.
 */
function can_see_content($allowed_levels) {
	$permission = false;
	if(isset($allowed_levels)) {
		/**
		 * We are doing 2 checks.
		 * First, we look for a cookie, and if it set, then we get the associated
		 * userlevel to see if we are allowed to enter the current page.
		*/
		if (isset($_COOKIE['userlevel']) && in_array($_COOKIE['userlevel'],$allowed_levels)) {
			$permission = true;
		}
		/**
		 * The second second check looks for a session, and if found see if the user
		 * level is among those defined by the page.
		 *
		 * $allowed_levels in defined on each page before the inclusion of header.php
		*/
		if (isset($_SESSION['userlevel']) && in_array($_SESSION['userlevel'],$allowed_levels)) {
			$permission = true;
		}
		/**
		 * After the checks, if the user is allowed, continue.
		 * If not, show the "Not allowed message", then the footer, then die(); so the
		 * actual page content is not generated.
		*/
	}
	if (!$permission) {
	?>
		<div id="main">
			<h2><?php _e('Access denied','cftp_admin'); ?></h2>
			<div class="whiteform whitebox">
				<?php
					$msg = __("Your account type doesn't allow you to view this page. Please contact a system administrator if you need to access this functions.",'cftp_admin');
					echo system_message('error',$msg);
				?>
			</div>
		</div>
		<?php
		include('footer.php');
		die();
	}
}

?>