<?php
  /**
   * ownCloud
   *
   * @author Frank Karlitschek
   * @author Jakob Sack
   * @copyright 2012 Frank Karlitschek frank@owncloud.org
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
   * License as published by the Free Software Foundation; either
   * version 3 of the License, or any later version.
   *
   * This library 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 AFFERO GENERAL PUBLIC LICENSE for more details.
   *
   * You should have received a copy of the GNU Affero General Public
   * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
   *
   */
  
  /**
   * This class provides an easy way for apps to store config values in the
   * database.
   */
  
  class OC_OCSClient{
  
  	/**

  	 * Get the url of the OCS AppStore server.
  	 * @return string of the AppStore server

  	 *
  	 * This function returns the url of the OCS AppStore server. It´s possible
  	 * to set it in the config file or it will fallback to the default
  	 */
  	private static function getAppStoreURL() {

  		if(OC_Util::getEditionString()===''){

  			$default='https://api.owncloud.com/v1';

  		}else{
  			$default='';
  		}
  		$url = OC_Config::getValue('appstoreurl', $default);

  		return($url);
  	}

  
  	/**

  	 * Get the content of an OCS url call.
  	 * @return string of the response

  	 * This function calls an OCS server and returns the response. It also sets a sane timeout

  	* @param string $url

  	*/
  	private static function getOCSresponse($url) {
  		$data = \OC_Util::getUrlContent($url);
  		return($data);
  	}
  
  	/**

  	 * Get all the categories from the OCS server

  	 * @return array|null an array of category ids or null

  	 * @note returns NULL if config value appstoreenabled is set to false
  	 * This function returns a list of all the application categories on the OCS server
  	 */
  	public static function getCategories() {
  		if(OC_Config::getValue('appstoreenabled', true)==false) {
  			return null;
  		}
  		$url=OC_OCSClient::getAppStoreURL().'/content/categories';
  		$xml=OC_OCSClient::getOCSresponse($url);
  		if($xml==false) {
  			return null;
  		}

  		$loadEntities = libxml_disable_entity_loader(true);
  		$data =	simplexml_load_string($xml);
  		libxml_disable_entity_loader($loadEntities);

  
  		$tmp=$data->data;
  		$cats=array();
  
  		foreach($tmp->category as $value) {
  
  			$id= (int) $value->id;
  			$name= (string) $value->name;
  			$cats[$id]=$name;
  
  		}
  
  		return $cats;
  	}
  
  	/**

  	 * Get all the applications from the OCS server

  	 * @return array|null an array of application data or null

  	 *
  	 * This function returns a list of all the applications on the OCS server

  	 * @param array|string $categories
  	 * @param int $page
  	 * @param string $filter

  	 */
  	public static function getApplications($categories, $page, $filter) {
  		if(OC_Config::getValue('appstoreenabled', true)==false) {
  			return(array());
  		}
  
  		if(is_array($categories)) {
  			$categoriesstring=implode('x', $categories);
  		}else{
  			$categoriesstring=$categories;
  		}
  
  		$version='&version='.implode('x', \OC_Util::getVersion());
  		$filterurl='&filter='.urlencode($filter);
  		$url=OC_OCSClient::getAppStoreURL().'/content/data?categories='.urlencode($categoriesstring)
  			.'&sortmode=new&page='.urlencode($page).'&pagesize=100'.$filterurl.$version;
  		$apps=array();
  		$xml=OC_OCSClient::getOCSresponse($url);
  
  		if($xml==false) {
  			return null;
  		}

  		$loadEntities = libxml_disable_entity_loader(true);
  		$data = simplexml_load_string($xml);
  		libxml_disable_entity_loader($loadEntities);

  
  		$tmp=$data->data->content;
  		for($i = 0; $i < count($tmp); $i++) {
  			$app=array();
  			$app['id']=(string)$tmp[$i]->id;
  			$app['name']=(string)$tmp[$i]->name;
  			$app['label']=(string)$tmp[$i]->label;
  			$app['version']=(string)$tmp[$i]->version;
  			$app['type']=(string)$tmp[$i]->typeid;
  			$app['typename']=(string)$tmp[$i]->typename;
  			$app['personid']=(string)$tmp[$i]->personid;
  			$app['license']=(string)$tmp[$i]->license;
  			$app['detailpage']=(string)$tmp[$i]->detailpage;
  			$app['preview']=(string)$tmp[$i]->smallpreviewpic1;
  			$app['changed']=strtotime($tmp[$i]->changed);
  			$app['description']=(string)$tmp[$i]->description;
  			$app['score']=(string)$tmp[$i]->score;
  
  			$apps[]=$app;
  		}
  		return $apps;
  	}
  
  
  	/**

  	 * Get an the applications from the OCS server
  	 * @param string $id

  	 * @return array|null an array of application data or null

  	 *

  	 * This function returns an applications from the OCS server

  	 */
  	public static function getApplication($id) {
  		if(OC_Config::getValue('appstoreenabled', true)==false) {
  			return null;
  		}
  		$url=OC_OCSClient::getAppStoreURL().'/content/data/'.urlencode($id);
  		$xml=OC_OCSClient::getOCSresponse($url);
  
  		if($xml==false) {

  			OC_Log::write('core', 'Unable to parse OCS content for app ' . $id, OC_Log::FATAL);

  			return null;
  		}

  		$loadEntities = libxml_disable_entity_loader(true);
  		$data = simplexml_load_string($xml);
  		libxml_disable_entity_loader($loadEntities);

  
  		$tmp=$data->data->content;

  		if (is_null($tmp)) {
  			OC_Log::write('core', 'Invalid OCS content returned for app ' . $id, OC_Log::FATAL);
  			return null;
  		}

  		$app=array();
  		$app['id']=$tmp->id;
  		$app['name']=$tmp->name;
  		$app['version']=$tmp->version;
  		$app['type']=$tmp->typeid;
  		$app['label']=$tmp->label;
  		$app['typename']=$tmp->typename;
  		$app['personid']=$tmp->personid;
  		$app['detailpage']=$tmp->detailpage;
  		$app['preview1']=$tmp->smallpreviewpic1;
  		$app['preview2']=$tmp->smallpreviewpic2;
  		$app['preview3']=$tmp->smallpreviewpic3;
  		$app['changed']=strtotime($tmp->changed);
  		$app['description']=$tmp->description;
  		$app['detailpage']=$tmp->detailpage;
  		$app['score']=$tmp->score;
  
  		return $app;
  	}
  
  	/**

  	 * Get the download url for an application from the OCS server

  	 * @return array|null an array of application data or null

  	 *
  	 * This function returns an download url for an applications from the OCS server
  	 * @param string $id
  	 * @param integer $item
  	 */

  	public static function getApplicationDownload($id, $item) {
  		if(OC_Config::getValue('appstoreenabled', true)==false) {
  			return null;
  		}
  		$url=OC_OCSClient::getAppStoreURL().'/content/download/'.urlencode($id).'/'.urlencode($item);
  		$xml=OC_OCSClient::getOCSresponse($url);
  
  		if($xml==false) {
  			OC_Log::write('core', 'Unable to parse OCS content', OC_Log::FATAL);
  			return null;
  		}

  		$loadEntities = libxml_disable_entity_loader(true);
  		$data = simplexml_load_string($xml);
  		libxml_disable_entity_loader($loadEntities);

  
  		$tmp=$data->data->content;
  		$app=array();
  		if(isset($tmp->downloadlink)) {
  			$app['downloadlink']=$tmp->downloadlink;
  		}else{
  			$app['downloadlink']='';
  		}
  		return $app;
  	}

  }