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<?php
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// $Id: class.admin.php 519 2007-12-23 14:37:02Z Ruebenwurzel $
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/*
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 Website Baker Project <http://www.websitebaker.org/>
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 Copyright (C) 2004-2008, Ryan Djurovich
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 Website Baker is free software; you can redistribute it and/or modify
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 it under the terms of the GNU General Public License as published by
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 the Free Software Foundation; either version 2 of the License, or
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 (at your option) any later version.
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 Website Baker is distributed in the hope that it will be useful,
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 but WITHOUT ANY WARRANTY; without even the implied warranty of
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 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 GNU General Public License for more details.
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 You should have received a copy of the GNU General Public License
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 along with Website Baker; if not, write to the Free Software
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 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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*/
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/*
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Admin class
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This class will be used for every program that will be included
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in the administration section of Website Baker.
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*/
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if(!defined('WB_URL')) {
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	header('Location: ../index.php');
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	exit(0);
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}
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require_once(WB_PATH.'/framework/class.wb.php');
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// Include PHPLIB template class
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require_once(WB_PATH."/include/phplib/template.inc");
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// Get WB version
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require_once(ADMIN_PATH.'/interface/version.php');
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/*
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Begin user changeable settings
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*/
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class admin extends wb {
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	// Authenticate user then auto print the header
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	function admin($section_name, $section_permission = 'start', $auto_header = true, $auto_auth = true) {
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		$this->wb();
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		global $MESSAGE;
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		// Specify the current applications name
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		$this->section_name = $section_name;
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		$this->section_permission = $section_permission;
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		// Authenticate the user for this application
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		if($auto_auth == true) {
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			// First check if the user is logged-in
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			if($this->is_authenticated() == false) {
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				header('Location: '.ADMIN_URL.'/login/index.php');
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				exit(0);
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			}
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			// Now check if they are allowed in this section
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			if($this->get_permission($section_permission) == false) {
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				die($MESSAGE['ADMIN']['INSUFFICIENT_PRIVELLIGES']);
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			}
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		}
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		// Auto header code
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		if($auto_header == true) {
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			$this->print_header();
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		}
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	}
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	// Print the admin header
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	function print_header($body_tags = '') {
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		// Get vars from the language file
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		global $MENU;
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		global $MESSAGE;
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		global $TEXT;
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		// Connect to database and get website title
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		global $database;
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		$get_title = $database->query("SELECT value FROM ".TABLE_PREFIX."settings WHERE name = 'website_title'");
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		$title = $get_title->fetchRow();
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		$header_template = new Template(ADMIN_PATH."/interface");
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		$header_template->set_file('page', 'header.html');
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		$header_template->set_block('page', 'header_block', 'header');
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		if(defined('DEFAULT_CHARSET')) {
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			$charset=DEFAULT_CHARSET;
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		} else {
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			$charset='utf-8';
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		}
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		$header_template->set_var(	array(
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													'SECTION_NAME' => $MENU[strtoupper($this->section_name)],
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													'INTERFACE_DIR' => ADMIN_URL.'/interface',
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													'BODY_TAGS' => $body_tags,
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													'WEBSITE_TITLE' => ($title['value']),
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													'TEXT_ADMINISTRATION' => $TEXT['ADMINISTRATION'],
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													'CHARSET' => $charset,
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													'VERSION' => VERSION,
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													'WB_URL' => WB_URL,
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													'BACKEND_MODULE_CSS' => $this->register_backend_modfiles('css'),	// adds backend.css
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													'BACKEND_MODULE_JS'  => $this->register_backend_modfiles('js')		// adds backend.js
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													)
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											);
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		// Create the menu
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		$menu = array(
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					array(ADMIN_URL.'/start/index.php', '', $MENU['START'], 'start', 0),
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					array(ADMIN_URL.'/pages/index.php', '', $MENU['PAGES'], 'pages', 1),
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					array(ADMIN_URL.'/media/index.php', '', $MENU['MEDIA'], 'media', 1),
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					array(ADMIN_URL.'/addons/index.php', '', $MENU['ADDONS'], 'addons', 1),
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					array(ADMIN_URL.'/preferences/index.php', '', $MENU['PREFERENCES'], 'preferences', 0),
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					array(ADMIN_URL.'/settings/index.php', '', $MENU['SETTINGS'], 'settings', 1),
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					array(ADMIN_URL.'/access/index.php', '', $MENU['ACCESS'], 'access', 1),
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					array('http://www.websitebaker.org/help/'.WB_VERSION, '_blank', $MENU['HELP'], 'help', 0),
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					array(WB_URL.'/', '_blank', $MENU['VIEW'], 'view', 0),
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					array(ADMIN_URL.'/logout/index.php', '', $MENU['LOGOUT'], 'logout', 0)
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					);
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		$header_template->set_block('header_block', 'linkBlock', 'link');
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		foreach($menu AS $menu_item) {
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			$link = $menu_item[0];
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			$target = $menu_item[1];
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			$title = $menu_item[2];
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			$permission_title = $menu_item[3];
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			$required = $menu_item[4];
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			$replace_old = array(ADMIN_URL, WB_URL, '/', 'index.php');
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			if($required == false OR $this->get_link_permission($permission_title)) {
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				$header_template->set_var('LINK', $link);
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				$header_template->set_var('TARGET', $target);
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				// If link is the current section apply a class name
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				if($permission_title == strtolower($this->section_name)) {
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					$header_template->set_var('CLASS', 'current');
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				} else {
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					$header_template->set_var('CLASS', '');
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				}
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				$header_template->set_var('TITLE', $title);
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				// Print link
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				$header_template->parse('link', 'linkBlock', true);
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			}
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		}
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		$header_template->parse('header', 'header_block', false);
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		$header_template->pparse('output', 'page');
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	}
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	// Print the admin footer
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	function print_footer() {
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		$footer_template = new Template(ADMIN_PATH."/interface");
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		$footer_template->set_file('page', 'footer.html');
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		$footer_template->set_block('page', 'footer_block', 'header');
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		$footer_template->parse('header', 'footer_block', false);
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		$footer_template->pparse('output', 'page');
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	}
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	// Return a system permission
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	function get_permission($name, $type = 'system') {
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		// Append to permission type
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		$type .= '_permissions';
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		// Check if we have a section to check for
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		if($name == 'start') {
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			return true;
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		} else {
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			// Set system permissions var
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			$system_permissions = $this->get_session('SYSTEM_PERMISSIONS');
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			// Set module permissions var
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			$module_permissions = $this->get_session('MODULE_PERMISSIONS');
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			// Set template permissions var
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			$template_permissions = $this->get_session('TEMPLATE_PERMISSIONS');
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			// Return true if system perm = 1
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			if(is_numeric(array_search($name, $$type))) {
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				if($type == 'system_permissions') {
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					return true;
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				} else {
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					return false;
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				}
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			} else {
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				if($type == 'system_permissions') {
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					return false;
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				} else {
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					return true;
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				}
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			}
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		}
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	}
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	function get_user_details($user_id) {
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		global $database;
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		$query_user = "SELECT username,display_name FROM ".TABLE_PREFIX."users WHERE user_id = '$user_id'";
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		$get_user = $database->query($query_user);
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		if($get_user->numRows() != 0) {
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			$user = $get_user->fetchRow();
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		} else {
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			$user['display_name'] = 'Unknown';
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			$user['username'] = 'unknown';
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		}
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		return $user;
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	}	
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	function get_page_details($page_id) {
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		global $database;
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		$query = "SELECT page_id,page_title,modified_by,modified_when FROM ".TABLE_PREFIX."pages WHERE page_id = '$page_id'";
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		$results = $database->query($query);
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		if($database->is_error()) {
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			$this->print_header();
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			$this->print_error($database->get_error());
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		}
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		if($results->numRows() == 0) {
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			$this->print_header();
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			$this->print_error($MESSAGE['PAGES']['NOT_FOUND']);
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		}
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		$results_array = $results->fetchRow();
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		return $results_array;
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	}	
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	/** Function get_page_permission takes either a numerical page_id,
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	 * upon which it looks up the permissions in the database,
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	 * or an array with keys admin_groups and admin_users  
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	 */
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	function get_page_permission($page,$action='admin') {
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		if ($action!='viewing') $action='admin';
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		$action_groups=$action.'_groups';
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		$action_users=$action.'_users';
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		if (is_array($page)) {
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				$groups=$page[$action_groups];
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				$users=$page[$action_users];
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		} else {				
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			global $database;
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			$results = $database->query("SELECT $action_groups,$action_users FROM ".TABLE_PREFIX."pages WHERE page_id = '$page'");
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			$result = $results->fetchRow();
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			$groups = explode(',', str_replace('_', '', $result[$action_groups]));
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			$users = explode(',', str_replace('_', '', $result[$action_users]));
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		}
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		if(!is_numeric(array_search($this->get_group_id(), $groups)) AND !is_numeric(array_search($this->get_user_id(), $users))) {
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			return false;
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		}
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		return true;
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	}
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	// Returns a system permission for a menu link
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	function get_link_permission($title) {
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		$title = str_replace('_blank', '', $title);
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		$title = strtolower($title);
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		// Set system permissions var
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		$system_permissions = $this->get_session('SYSTEM_PERMISSIONS');
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		// Set module permissions var
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		$module_permissions = $this->get_session('MODULE_PERMISSIONS');
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		if($title == 'start') {
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			return true;
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		} else {
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			// Return true if system perm = 1
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			if(is_numeric(array_search($title, $system_permissions))) {
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				return true;
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			} else {
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				return false;
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			}
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		}
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	}
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	// Function to add optional module Javascript or CSS stylesheets into the <head> section of the backend
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	function register_backend_modfiles($file_id="css") {
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		// sanity check of parameter passed to the function
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		$file_id = strtolower($file_id);
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		if($file_id !== "css" && $file_id !== "javascript" && $file_id !== "js") { 
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			return;
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		}
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		global $database;
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		// define default baselink and filename for optional module javascript and stylesheet files
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		$head_links = "";
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		if($file_id == "css") {
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      	$base_link = '<link href="'.WB_URL.'/modules/{MODULE_DIRECTORY}/backend.css"'; 
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			$base_link.= 'rel="stylesheet" type="text/css" media="screen" />';
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			$base_file = "backend.css";
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		} else {
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			$base_link = '<script type="text/javascript" src="'.WB_URL.'/modules/{MODULE_DIRECTORY}/backend.js"></script>';
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			$base_file = "backend.js";
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		}
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		// check if backend.js or backend.css files needs to be included to the <head></head> section of the backend
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		if(isset($_GET['tool'])) {
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			// check if displayed page contains a installed admin tool
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			$result = $database->query("SELECT * FROM " .TABLE_PREFIX ."addons 
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				WHERE type = 'module' AND function = 'tool' AND directory = '".$_GET['tool']."'");
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			if($result->numRows()) {
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				// check if admin tool directory contains a backend.js or backend.css file to include
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				$tool = $result->fetchRow();
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				if(file_exists(WB_PATH ."/modules/" .$tool['directory'] ."/$base_file")) {
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        			// return link to the backend.js or backend.css file
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					return str_replace("{MODULE_DIRECTORY}", $tool['directory'], $base_link);
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				}
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			}
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		} elseif(isset($_GET['page_id'])) {
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			// check if displayed page in the backend contains a page module
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			$page_id = (int) $_GET['page_id'];
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    		// gather information for all models embedded on actual page
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			$query_modules = $database->query("SELECT module FROM " .TABLE_PREFIX ."sections 
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				WHERE page_id=$page_id AND module<>'wysiwyg'");
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    		while($row = $query_modules->fetchRow()) {
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				// check if page module directory contains a backend.js or backend.css file
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      		if(file_exists(WB_PATH ."/modules/" .$row['module'] ."/$base_file")) {
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					// create link with backend.js or backend.css source for the current module
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					$tmp_link = str_replace("{MODULE_DIRECTORY}", $row['module'], $base_link);
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        			// ensure that backend.js or backend.css is only added once per module type
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        			if(strpos($head_links, $tmp_link) === false) {
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						$head_links .= $tmp_link ."\n";
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					}
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				}
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    		}
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    		// write out links with all external module javascript/CSS files, remove last line feed
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			return rtrim($head_links);
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		}
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	}
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}
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?>
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