<?php
  /**
  * ownCloud
  *
  * @author Michael Gapczynski
  * @copyright 2012 Michael Gapczynski mtgap@owncloud.com
  *
  * 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/>.
  */
  
  /**
  * Class to configure the config/mount.php and data/$user/mount.php files
  */
  class OC_Mount_Config {
  
  	const MOUNT_TYPE_GLOBAL = 'global';
  	const MOUNT_TYPE_GROUP = 'group';
  	const MOUNT_TYPE_USER = 'user';
  
  	/**
  	* Get details on each of the external storage backends, used for the mount config UI
  	* If a custom UI is needed, add the key 'custom' and a javascript file with that name will be loaded
  	* If the configuration parameter should be secret, add a '*' to the beginning of the value
  	* If the configuration parameter is a boolean, add a '!' to the beginning of the value
  	* If the configuration parameter is optional, add a '&' to the beginning of the value
  	* If the configuration parameter is hidden, add a '#' to the beginning of the value
  	* @return array
  	*/
  	public static function getBackends() {
  
  		$backends['\OC\Files\Storage\Local']=array(
  				'backend' => 'Local',
  				'configuration' => array(
  					'datadir' => 'Location'));
  
  		$backends['\OC\Files\Storage\AmazonS3']=array(
  			'backend' => 'Amazon S3',
  			'configuration' => array(

  				'key' => 'Access Key',
  				'secret' => '*Secret Key',
  				'bucket' => 'Bucket',
  				'hostname' => '&Hostname (optional)',
  				'port' => '&Port (optional)',
  				'region' => '&Region (optional)',
  				'use_ssl' => '!Enable SSL',
  				'use_path_style' => '!Enable Path Style'));

  
  		$backends['\OC\Files\Storage\Dropbox']=array(
  			'backend' => 'Dropbox',
  			'configuration' => array(
  				'configured' => '#configured',
  				'app_key' => 'App key',
  				'app_secret' => 'App secret',
  				'token' => '#token',
  				'token_secret' => '#token_secret'),
  				'custom' => 'dropbox');
  
  		if(OC_Mount_Config::checkphpftp()) $backends['\OC\Files\Storage\FTP']=array(
  			'backend' => 'FTP',
  			'configuration' => array(
  				'host' => 'URL',
  				'user' => 'Username',
  				'password' => '*Password',
  				'root' => '&Root',
  				'secure' => '!Secure ftps://'));

  		if(OC_Mount_Config::checkcurl()) $backends['\OC\Files\Storage\Google']=array(

  			'backend' => 'Google Drive',
  			'configuration' => array(
  				'configured' => '#configured',
  				'client_id' => 'Client ID',
  				'client_secret' => 'Client secret',
  				'token' => '#token'),
  				'custom' => 'google');

  		if(OC_Mount_Config::checkcurl()) {
  			$backends['\OC\Files\Storage\Swift'] = array(
  				'backend' => 'OpenStack Object Storage',
  				'configuration' => array(
  					'user' => 'Username (required)',
  					'bucket' => 'Bucket (required)',
  					'region' => '&Region (optional for OpenStack Object Storage)',
  					'key' => '*API Key (required for Rackspace Cloud Files)',
  					'tenant' => '&Tenantname (required for OpenStack Object Storage)',
  					'password' => '*Password (required for OpenStack Object Storage)',
  					'service_name' => '&Service Name (required for OpenStack Object Storage)',
  					'url' => '&URL of identity endpoint (required for OpenStack Object Storage)',
  					'timeout' => '&Timeout of HTTP requests in seconds (optional)',
  				)
  			);
                  }

  
  		if (!OC_Util::runningOnWindows()) {
  			if (OC_Mount_Config::checksmbclient()) {
  				$backends['\OC\Files\Storage\SMB'] = array(
  					'backend' => 'SMB / CIFS',
  					'configuration' => array(
  						'host' => 'URL',
  						'user' => 'Username',
  						'password' => '*Password',
  						'share' => 'Share',
  						'root' => '&Root'));
  			}
  		}

  		if(OC_Mount_Config::checkcurl()) $backends['\OC\Files\Storage\DAV']=array(

  			'backend' => 'ownCloud / WebDAV',
  			'configuration' => array(
  				'host' => 'URL',
  				'user' => 'Username',
  				'password' => '*Password',
  				'root' => '&Root',
  				'secure' => '!Secure https://'));
  
  		$backends['\OC\Files\Storage\SFTP']=array(
  			'backend' => 'SFTP',
  			'configuration' => array(
  				'host' => 'URL',
  				'user' => 'Username',
  				'password' => '*Password',
  				'root' => '&Root'));
  
  		$backends['\OC\Files\Storage\iRODS']=array(
  			'backend' => 'iRODS',
  			'configuration' => array(
  				'host' => 'Host',
  				'port' => 'Port',
  				'use_logon_credentials' => '!Use ownCloud login',
  				'user' => 'Username',
  				'password' => '*Password',
  				'auth_mode' => 'Authentication Mode',
  				'zone' => 'Zone'));
  
  		return($backends);
  	}
  
  	/**
  	* Get the system mount points
  	* The returned array is not in the same format as getUserMountPoints()
  	* @return array
  	*/
  	public static function getSystemMountPoints() {
  		$mountPoints = self::readData(false);
  		$backends = self::getBackends();
  		$system = array();
  		if (isset($mountPoints[self::MOUNT_TYPE_GROUP])) {
  			foreach ($mountPoints[self::MOUNT_TYPE_GROUP] as $group => $mounts) {
  				foreach ($mounts as $mountPoint => $mount) {
  					// Update old classes to new namespace
  					if (strpos($mount['class'], 'OC_Filestorage_') !== false) {
  						$mount['class'] = '\OC\Files\Storage\\'.substr($mount['class'], 15);
  					}
  					// Remove '/$user/files/' from mount point
  					$mountPoint = substr($mountPoint, 13);
  					// Merge the mount point into the current mount points
  					if (isset($system[$mountPoint]) && $system[$mountPoint]['configuration'] == $mount['options']) {
  						$system[$mountPoint]['applicable']['groups']
  							= array_merge($system[$mountPoint]['applicable']['groups'], array($group));
  					} else {
  						$system[$mountPoint] = array(
  							'class' => $mount['class'],
  							'backend' => $backends[$mount['class']]['backend'],
  							'configuration' => $mount['options'],
  							'applicable' => array('groups' => array($group), 'users' => array()),
  							'status' => self::getBackendStatus($mount['class'], $mount['options'])
  						);
  					}
  				}
  			}
  		}
  		if (isset($mountPoints[self::MOUNT_TYPE_USER])) {
  			foreach ($mountPoints[self::MOUNT_TYPE_USER] as $user => $mounts) {
  				foreach ($mounts as $mountPoint => $mount) {
  					// Update old classes to new namespace
  					if (strpos($mount['class'], 'OC_Filestorage_') !== false) {
  						$mount['class'] = '\OC\Files\Storage\\'.substr($mount['class'], 15);
  					}
  					// Remove '/$user/files/' from mount point
  					$mountPoint = substr($mountPoint, 13);
  					// Merge the mount point into the current mount points
  					if (isset($system[$mountPoint]) && $system[$mountPoint]['configuration'] == $mount['options']) {
  						$system[$mountPoint]['applicable']['users']
  							= array_merge($system[$mountPoint]['applicable']['users'], array($user));
  					} else {
  						$system[$mountPoint] = array(
  							'class' => $mount['class'],
  							'backend' => $backends[$mount['class']]['backend'],
  							'configuration' => $mount['options'],
  							'applicable' => array('groups' => array(), 'users' => array($user)),
  							'status' => self::getBackendStatus($mount['class'], $mount['options'])
  						);
  					}
  				}
  			}
  		}
  		return $system;
  	}
  
  	/**
  	* Get the personal mount points of the current user
  	* The returned array is not in the same format as getUserMountPoints()
  	* @return array
  	*/
  	public static function getPersonalMountPoints() {
  		$mountPoints = self::readData(true);
  		$backends = self::getBackends();
  		$uid = OCP\User::getUser();
  		$personal = array();
  		if (isset($mountPoints[self::MOUNT_TYPE_USER][$uid])) {
  			foreach ($mountPoints[self::MOUNT_TYPE_USER][$uid] as $mountPoint => $mount) {
  				// Update old classes to new namespace
  				if (strpos($mount['class'], 'OC_Filestorage_') !== false) {
  					$mount['class'] = '\OC\Files\Storage\\'.substr($mount['class'], 15);
  				}
  				// Remove '/uid/files/' from mount point
  				$personal[substr($mountPoint, strlen($uid) + 8)] = array(
  					'class' => $mount['class'],
  					'backend' => $backends[$mount['class']]['backend'],
  					'configuration' => $mount['options'],
  					'status' => self::getBackendStatus($mount['class'], $mount['options'])
  				);
  			}
  		}
  		return $personal;
  	}
  
  	private static function getBackendStatus($class, $options) {
  		foreach ($options as &$option) {
  			$option = str_replace('$user', OCP\User::getUser(), $option);
  		}
  		if (class_exists($class)) {
  			try {
  				$storage = new $class($options);
  				return $storage->test();
  			} catch (Exception $exception) {

  				\OCP\Util::logException('files_external', $exception);

  				return false;
  			}
  		}
  		return false;
  	}
  
  	/**
  	* Add a mount point to the filesystem
  	* @param string Mount point
  	* @param string Backend class
  	* @param array Backend parameters for the class
  	* @param string MOUNT_TYPE_GROUP | MOUNT_TYPE_USER
  	* @param string User or group to apply mount to
  	* @param bool Personal or system mount point i.e. is this being called from the personal or admin page
  	* @return bool
  	*/
  	public static function addMountPoint($mountPoint,
  										 $class,
  										 $classOptions,
  										 $mountType,
  										 $applicable,
  										 $isPersonal = false) {

  		$mountPoint = OC\Files\Filesystem::normalizePath($mountPoint);
  		if ($mountPoint === '' || $mountPoint === '/' || $mountPoint == '/Shared') {
  			// can't mount at root or "Shared" folder
  			return false;
  		}

  		if ($isPersonal) {
  			// Verify that the mount point applies for the current user
  			// Prevent non-admin users from mounting local storage
  			if ($applicable != OCP\User::getUser() || $class == '\OC\Files\Storage\Local') {
  				return false;
  			}
  			$mountPoint = '/'.$applicable.'/files/'.ltrim($mountPoint, '/');
  		} else {
  			$mountPoint = '/$user/files/'.ltrim($mountPoint, '/');
  		}
  		$mount = array($applicable => array($mountPoint => array('class' => $class, 'options' => $classOptions)));
  		$mountPoints = self::readData($isPersonal);
  		// Merge the new mount point into the current mount points
  		if (isset($mountPoints[$mountType])) {
  			if (isset($mountPoints[$mountType][$applicable])) {
  				$mountPoints[$mountType][$applicable]
  					= array_merge($mountPoints[$mountType][$applicable], $mount[$applicable]);
  			} else {
  				$mountPoints[$mountType] = array_merge($mountPoints[$mountType], $mount);
  			}
  		} else {
  			$mountPoints[$mountType] = $mount;
  		}
  		self::writeData($isPersonal, $mountPoints);
  		return self::getBackendStatus($class, $classOptions);
  	}
  
  	/**
  	*
  	* @param string Mount point
  	* @param string MOUNT_TYPE_GROUP | MOUNT_TYPE_USER
  	* @param string User or group to remove mount from
  	* @param bool Personal or system mount point
  	* @return bool
  	*/
  	public static function removeMountPoint($mountPoint, $mountType, $applicable, $isPersonal = false) {
  		// Verify that the mount point applies for the current user
  		if ($isPersonal) {
  			if ($applicable != OCP\User::getUser()) {
  				return false;
  			}
  			$mountPoint = '/'.$applicable.'/files/'.ltrim($mountPoint, '/');
  		} else {
  			$mountPoint = '/$user/files/'.ltrim($mountPoint, '/');
  		}
  		$mountPoints = self::readData($isPersonal);
  		// Remove mount point
  		unset($mountPoints[$mountType][$applicable][$mountPoint]);
  		// Unset parent arrays if empty
  		if (empty($mountPoints[$mountType][$applicable])) {
  			unset($mountPoints[$mountType][$applicable]);
  			if (empty($mountPoints[$mountType])) {
  				unset($mountPoints[$mountType]);
  			}
  		}
  		self::writeData($isPersonal, $mountPoints);
  		return true;
  	}
  
  	/**
  	* Read the mount points in the config file into an array
  	* @param bool Personal or system config file
  	* @return array
  	*/
  	private static function readData($isPersonal) {
  		$parser = new \OC\ArrayParser();
  		if ($isPersonal) {
  			$phpFile = OC_User::getHome(OCP\User::getUser()).'/mount.php';
  			$jsonFile = OC_User::getHome(OCP\User::getUser()).'/mount.json';
  		} else {
  			$datadir = \OC_Config::getValue("datadirectory", \OC::$SERVERROOT . "/data");
  			$phpFile = OC::$SERVERROOT.'/config/mount.php';
  			$jsonFile = $datadir . '/mount.json';
  		}
  		if (is_file($jsonFile)) {
  			$mountPoints = json_decode(file_get_contents($jsonFile), true);
  			if (is_array($mountPoints)) {
  				return $mountPoints;
  			}
  		} elseif (is_file($phpFile)) {
  			$mountPoints = $parser->parsePHP(file_get_contents($phpFile));
  			if (is_array($mountPoints)) {
  				return $mountPoints;
  			}
  		}
  		return array();
  	}
  
  	/**
  	* Write the mount points to the config file
  	* @param bool Personal or system config file
  	* @param array Mount points
  	*/
  	private static function writeData($isPersonal, $data) {
  		if ($isPersonal) {
  			$file = OC_User::getHome(OCP\User::getUser()).'/mount.json';
  		} else {
  			$datadir = \OC_Config::getValue("datadirectory", \OC::$SERVERROOT . "/data");
  			$file = $datadir . '/mount.json';
  		}
  		$content = json_encode($data);
  		@file_put_contents($file, $content);

  		@chmod($file, 0640);

  	}
  
  	/**
  	 * Returns all user uploaded ssl root certificates
  	 * @return array
  	 */
  	public static function getCertificates() {
  		$view = \OCP\Files::getStorage('files_external');
  		$path=\OCP\Config::getSystemValue('datadirectory').$view->getAbsolutePath("").'uploads/';
  		\OCP\Util::writeLog('files_external', 'checking path '.$path, \OCP\Util::INFO);
  		if ( ! is_dir($path)) {
  			//path might not exist (e.g. non-standard OC_User::getHome() value)
  			//in this case create full path using 3rd (recursive=true) parameter.
  			mkdir($path, 0777, true);
  		}
  		$result = array();
  		$handle = opendir($path);

  		if(!is_resource($handle)) {

  			return array();
  		}
  		while (false !== ($file = readdir($handle))) {
  			if ($file != '.' && $file != '..') $result[] = $file;
  		}
  		return $result;
  	}
  
  	/**
  	 * creates certificate bundle
  	 */
  	public static function createCertificateBundle() {
  		$view = \OCP\Files::getStorage("files_external");
  		$path = \OCP\Config::getSystemValue('datadirectory').$view->getAbsolutePath("");
  
  		$certs = OC_Mount_Config::getCertificates();
  		$fh_certs = fopen($path."/rootcerts.crt", 'w');
  		foreach ($certs as $cert) {
  			$file=$path.'/uploads/'.$cert;
  			$fh = fopen($file, "r");
  			$data = fread($fh, filesize($file));
  			fclose($fh);
  			if (strpos($data, 'BEGIN CERTIFICATE')) {
  				fwrite($fh_certs, $data);
  				fwrite($fh_certs, "\r
  ");
  			}
  		}
  
  		fclose($fh_certs);
  
  		return true;
  	}
  
  	/**
  	 * check if smbclient is installed
  	 */
  	public static function checksmbclient() {
  		if(function_exists('shell_exec')) {
  			$output=shell_exec('which smbclient');

  			return !empty($output);

  		}else{

  			return false;

  		}
  	}
  
  	/**
  	 * check if php-ftp is installed
  	 */
  	public static function checkphpftp() {
  		if(function_exists('ftp_login')) {

  			return true;

  		}else{

  			return false;

  		}
  	}
  
  	/**

  	 * check if curl is installed
  	 */
  	public static function checkcurl() {
  		return function_exists('curl_init');
  	}
  
  	/**

  	 * check dependencies
  	 */
  	public static function checkDependencies() {
  		$l= new OC_L10N('files_external');
  		$txt='';
  		if (!OC_Util::runningOnWindows()) {
  			if(!OC_Mount_Config::checksmbclient()) {
  				$txt.=$l->t('<b>Warning:</b> "smbclient" is not installed. Mounting of CIFS/SMB shares is not possible. Please ask your system administrator to install it.').'<br />';
  			}
  		}
  		if(!OC_Mount_Config::checkphpftp()) {
  			$txt.=$l->t('<b>Warning:</b> The FTP support in PHP is not enabled or installed. Mounting of FTP shares is not possible. Please ask your system administrator to install it.').'<br />';
  		}

  		if(!OC_Mount_Config::checkcurl()) {
  			$txt.=$l->t('<b>Warning:</b> The Curl support in PHP is not enabled or installed. Mounting of ownCloud / WebDAV or GoogleDrive is not possible. Please ask your system administrator to install it.').'<br />';
  		}

  		return $txt;

  	}
  }