<?php
/* Copyright (C) 2015   Jean-François Ferry     <jfefe@aternatik.fr>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

use Luracast\Restler\Restler;
use Luracast\Restler\RestException;
use Luracast\Restler\Defaults;

require_once DOL_DOCUMENT_ROOT.'/user/class/user.class.php';

/**
 * Class for API
 *
 */
class DolibarrApi
{

    /**
     * @var DoliDb        $db Database object
     */
    static protected $db;

    /**
     * @var Restler     $r	Restler object
     */
    var $r;

    /**
     * Constructor
     *
     * @param	DoliDb	$db		      Database handler
     * @param   string  $cachedir     Cache dir
     */
    function __construct($db, $cachedir='')
    {
        global $conf;
        
        if (empty($cachedir)) $cachedir = $conf->api->dir_temp;
        Defaults::$cacheDirectory = $cachedir;
        
        $this->db = $db;
        $production_mode = ( empty($conf->global->API_PRODUCTION_MODE) ? false : true );
        $this->r = new Restler($production_mode);
    }

    /**
     * Executed method when API is called without parameter
     *
     * Display a short message an return a http code 200
     *
     * @return array
     */
    function index()
    {
        return array(
            'success' => array(
                'code' => 200,
                'message' => __class__.' is up and running!'
            )
        );
    }


    /**
     * Clean sensible object datas
     *
     * @param   object  $object	Object to clean
     * @return	array	Array of cleaned object properties
     *
     * @todo use an array for properties to clean
     *
     */
    function _cleanObjectDatas($object) {

        // Remove $db object property for object
		unset($object->db);

        // If object has lines, remove $db property
        if(isset($object->lines) && count($object->lines) > 0)  {
            $nboflines = count($object->lines);
        	for ($i=0; $i < $nbofline; $i++)
            {
                $this->_cleanObjectDatas($object->lines[$i]);
            }
        }

        // If object has linked objects, remove $db property
        if(isset($object->linkedObjects) && count($object->linkedObjects) > 0)  {
            foreach($object->linkedObjects as $type_object => $linked_object) {
                foreach($linked_object as $object2clean) {
                    $this->_cleanObjectDatas($object2clean);
                }
            }
        }
		return $object;
    }

	/**
	 * Check user access to a resource
	 *
	 * Check access by user to a given resource
	 *
	 * @param string	$resource		element to check
	 * @param int		$resource_id	Object ID if we want to check a particular record (optional) is linked to a owned thirdparty (optional).
	 * @param type		$dbtablename	'TableName&SharedElement' with Tablename is table where object is stored. SharedElement is an optional key to define where to check entity. Not used if objectid is null (optional)
	 * @param string	$feature2		Feature to check, second level of permission (optional). Can be or check with 'level1|level2'.
	 * @param string	$dbt_keyfield   Field name for socid foreign key if not fk_soc. Not used if objectid is null (optional)
	 * @param string	$dbt_select     Field name for select if not rowid. Not used if objectid is null (optional)
	 * @throws RestException
	 */
	static function _checkAccessToResource($resource, $resource_id=0, $dbtablename='', $feature2='', $dbt_keyfield='fk_soc', $dbt_select='rowid') {

		// Features/modules to check
		$featuresarray = array($resource);
		if (preg_match('/&/', $resource)) {
			$featuresarray = explode("&", $resource);
		}
		else if (preg_match('/\|/', $resource)) {
			$featuresarray = explode("|", $resource);
		}

		// More subfeatures to check
		if (! empty($feature2)) {
			$feature2 = explode("|", $feature2);
		}

		return checkUserAccessToObject(DolibarrApiAccess::$user, $featuresarray,$resource_id,$dbtablename,$feature2,$dbt_keyfield,$dbt_select);
	}
}

/**
 * API init
 *
 */
class DolibarrApiInit extends DolibarrApi
{

	function __construct() {
		global $db;
		$this->db = $db;
	}

	/**
	 * Login
	 *
	 * Log user with username and password
	 *
	 * @param   string  $login			Username
	 * @param   string  $password		User password
	 * @param   int     $entity			User entity
     * @return  array   Response status and user token
     *
	 * @throws RestException
	 */
	public function login($login, $password, $entity = 0) {

		// Authentication mode
		if (empty($dolibarr_main_authentication))
			$dolibarr_main_authentication = 'http,dolibarr';
		// Authentication mode: forceuser
		if ($dolibarr_main_authentication == 'forceuser' && empty($dolibarr_auto_user))
			$dolibarr_auto_user = 'auto';
		// Set authmode
		$authmode = explode(',', $dolibarr_main_authentication);

		include_once DOL_DOCUMENT_ROOT . '/core/lib/security2.lib.php';
		$login = checkLoginPassEntity($login, $password, $entity, $authmode);
		if (empty($login))
		{
			throw new RestException(403, 'Access denied');
		}

		// Generate token for user
		$token = dol_hash($login.uniqid().$conf->global->MAIN_API_KEY,1);

		// We store API token into database
		$sql = "UPDATE ".MAIN_DB_PREFIX."user";
		$sql.= " SET api_key = '".$this->db->escape($token)."'";
		$sql.= " WHERE login = '".$this->db->escape($login)."'";

		dol_syslog(get_class($this)."::login", LOG_DEBUG);	// No log
		$result = $this->db->query($sql);
		if (!$result)
		{
			throw new RestException(500, 'Error when updating user :'.$this->db->error_msg);
		}

		//return token
		return array(
			'success' => array(
				'code' => 200,
				'token' => $token,
				'message' => 'Welcome ' . $login
			)
		);
	}

	/**
     * Get status (Dolibarr version)
     *
	 * @access protected
	 * @class  DolibarrApiAccess {@requires admin}
	 */
	function status() {
		require_once DOL_DOCUMENT_ROOT . '/core/lib/functions.lib.php';
		return array(
			'success' => array(
				'code' => 200,
				'dolibarr_version' => DOL_VERSION
			)
		);
    }
}