forked from extern/egroupware
407 lines
12 KiB
PHP
407 lines
12 KiB
PHP
<?php
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/**
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* EGroupware API: VFS sharing
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @author Ralf Becker <rb@stylite.de>
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* @copyright (c) 2014 by Ralf Becker <rb@stylite.de>
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* @version $Id$
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*/
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/**
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* VFS sharing
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*
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* Token generation uses openssl_random_pseudo_bytes, if available, otherwise
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* mt_rand based auth::randomstring is used.
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*
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* @todo handle existing user sessions eg. by mounting share under it's token into vfs and redirect to regular filemanager
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* @todo handle mounts inside shared directory (they get currently lost)
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* @todo handle absolute symlinks (wont work as we use share as root)
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*/
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class egw_sharing
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{
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/**
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* Length of base64 encoded token (real length is only 3/4 of it)
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*/
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const TOKEN_LENGTH = 64;
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/**
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* Name of table used for storing tokens
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*/
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const TABLE = 'egw_sharing';
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/**
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* Reference to global db object
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*
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* @var egw_db
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*/
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protected static $db;
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/**
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* Share we are instanciated for
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*
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* @var array
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*/
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protected $share;
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/**
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* Modes ATTACH is NOT a sharing mode, but it is traditional mode in email
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*/
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const ATTACH = 'attach';
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const LINK = 'link';
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const READONLY = 'share_ro';
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const WRITABLE = 'share_rw';
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/**
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* Modes for sharing files
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*
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* @var array
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*/
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static $modes = array(
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self::ATTACH => array(
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'label' => 'Attachment',
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'title' => 'Works reliable for total size up to 1-2 MB, might work for 5-10 MB, most likely to fail for >10MB',
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),
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self::LINK => array(
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'label' => 'Download link',
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'title' => 'Link is appended to mail allowing recipients to download currently attached version of files',
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),
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self::READONLY => array(
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'label' => 'Readonly share',
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'title' => 'Link is appended to mail allowing recipients to download up to date version of files',
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),
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self::WRITABLE => array(
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'label' => 'Writable share',
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'title' => 'Link is appended to mail allowing recipients to download or modify up to date version of files (EPL only)'
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),
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);
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/**
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* Protected constructor called via self::create_session
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*
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* @param string $token
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* @param array $share
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*/
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protected function __construct(array $share)
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{
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self::$db = $GLOBALS['egw']->db;
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$this->share = $share;
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}
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/**
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* Init sharing by setting PHP_AUTH_USER from token in url
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*/
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public static function init()
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{
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// WebDAV has no concept of a query string and clients (including cadaver)
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// seem to pass '?' unencoded, so we need to extract the path info out
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// of the request URI ourselves
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// if request URI contains a full url, remove schema and domain
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$matches = null;
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if (preg_match('|^https?://[^/]+(/.*)$|', $path_info=$_SERVER['REQUEST_URI'], $matches))
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{
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$path_info = $matches[1];
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}
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$path_info = substr($path_info, strlen($_SERVER['SCRIPT_NAME']));
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list(, $token/*, $path*/) = explode('/', $path_info, 3);
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$_SERVER['PHP_AUTH_USER'] = $token;
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if (!isset($_SERVER['PHP_AUTH_PW'])) $_SERVER['PHP_AUTH_PW'] = '';
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return $token;
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}
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/**
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* Create sharing session
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*
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* @return string with sessionid, does NOT return if no session created
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*/
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public static function create_session()
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{
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self::$db = $GLOBALS['egw']->db;
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$token = $_SERVER['PHP_AUTH_USER'];
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if (empty($token) || !($share = self::$db->select(self::TABLE, '*', array(
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'share_token' => $token,
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'(share_expires IS NULL OR share_expires > '.self::$db->quote(time(), 'date').')',
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), __LINE__, __FILE__)->fetch()) ||
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!$GLOBALS['egw']->accounts->exists($share['share_owner']))
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{
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sleep(1);
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$status = '404 Not Found';
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header("HTTP/1.1 $status");
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header("X-WebDAV-Status: $status", true);
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echo "Requested resource '/".htmlspecialchars($token)."' does NOT exist!\n";
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common::egw_exit();
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}
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// check password, if required
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if ($share['share_passwd'] && (empty($_SERVER['PHP_AUTH_PW']) ||
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!(auth::compare_password($_SERVER['PHP_AUTH_PW'], $share['share_passwd'], 'crypt') ||
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egw_digest_auth::decode_password($_SERVER['PHP_AUTH_PW']) &&
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auth::compare_password($_SERVER['PHP_AUTH_PW'], $share['share_passwd'], 'crypt'))))
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{
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$realm = 'EGroupware share '.$share['share_token'];
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header('WWW-Authenticate: Basic realm="'.$realm.'"');
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$status = '401 Unauthorized';
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header("HTTP/1.1 $status");
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header("X-WebDAV-Status: $status", true);
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echo "<html>\n<head>\n<title>401 Unauthorized</title>\n<body>\nAuthorization failed.\n</body>\n</html>\n";
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common::egw_exit();
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}
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// create session without checking auth: create(..., false, false)
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if (!($sessionid = $GLOBALS['egw']->session->create('anonymous', '', 'text', false, false)))
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{
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sleep(1);
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$status = '500 Internal Server Error';
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header("HTTP/1.1 $status");
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header("X-WebDAV-Status: $status", true);
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echo "Failed to create session: ".$GLOBALS['egw']->session->reason."\n";
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common::egw_exit();
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}
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// only allow filemanager app
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$GLOBALS['egw_info']['user']['apps'] = array(
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'filemanager' => $GLOBALS['egw_info']['apps']['filemanager']
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);
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$share['resolve_url'] = egw_vfs::resolve_url($share['share_path']);
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// if share not writable append ro=1 to mount url to make it readonly
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if (!self::$db->from_bool($share['share_writable']))
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{
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$share['resolve_url'] .= (strpos($share['resolve_url'], '?') ? '&' : '?').'ro=1';
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}
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//_debug_array($share);
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// arrange vfs to only contain shared url and use share-owner as user
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egw_vfs::$is_root = true;
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if (!egw_vfs::mount($share['resolve_url'], '/', false, false, true))
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{
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sleep(1);
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$status = '404 Not Found';
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header("HTTP/1.1 $status");
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header("X-WebDAV-Status: $status", true);
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echo "Requested resource '/".htmlspecialchars($token)."' does NOT exist!\n";
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common::egw_exit();
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}
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egw_vfs::$is_root = false;
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// need to store new fstab and vfs_user in session to allow GET requests / downloads via WebDAV
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$GLOBALS['egw_info']['server']['vfs_fstab'] = egw_vfs::mount();
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$GLOBALS['egw_info']['user']['vfs_user'] = egw_vfs::$user = $share['share_owner'];
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egw_vfs::clearstatcache();
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// update accessed timestamp
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self::$db->update(self::TABLE, array(
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'share_last_accessed' => $share['share_last_accessed']=time(),
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), array(
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'share_id' => $share['share_id'],
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), __LINE__, __FILE__);
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// store sharing object in egw object and therefore in session
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$GLOBALS['egw']->sharing = new egw_sharing($share);
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return $sessionid;
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}
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/**
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* Server a request on a share specified in REQUEST_URI
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*/
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public function ServeRequest()
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{
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// use pure WebDAV for everything but GET requests to directories
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if (!egw_vfs::is_dir('/') || $_SERVER['REQUEST_METHOD'] != 'GET' ||
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// or unsupported browsers like ie < 10
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html::$user_agent == 'msie' && html::$ua_version < 10.0 ||
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// or if no filemanager installed (WebDAV has own autoindex)
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!file_exists(__DIR__.'/../../filemanager/inc/class.filemanager_ui.inc.php'))
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{
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//$GLOBALS['egw']->session->commit_session();
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$webdav_server = new vfs_webdav_server();
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$webdav_server->ServeRequest('/'.$this->share['share_token']);
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return;
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}
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// run full eTemplate2 UI for directories
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$_GET['path'] = '/';
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$ui = new egw_sharing_filemanager();
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$ui->index();
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}
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/**
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* Generate a new token
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*
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* @return string
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*/
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public static function token()
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{
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// generate random token (using oppenssl if available otherwise mt_rand based auth::randomstring)
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$token = function_exists('openssl_random_pseudo_bytes') ?
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base64_encode(openssl_random_pseudo_bytes(3*self::TOKEN_LENGTH/4)) :
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auth::randomstring(self::TOKEN_LENGTH);
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return $token;
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}
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/**
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* Create a new share
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*
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* @param string $path either path in temp_dir or vfs with optional vfs scheme
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* @param string $mode self::LINK: copy file in users tmp-dir or self::READABLE share given vfs file,
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* if no vfs behave as self::LINK
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* @param string $name filename to use for $mode==self::LINK, default basename of $path
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* @param string|array $recipients one or more recipient email addresses
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* @param array $extra =array() extra data to store
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* @throw egw_exception_not_found if $path not found
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* @throw egw_excpetion_assertion_failed if user temp. directory does not exist and can not be created
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* @return array with share data, eg. value for key 'share_token'
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*/
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public static function create($path, $mode, $name, $recipients, $extra=array())
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{
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if (!isset(self::$db)) self::$db = $GLOBALS['egw']->db;
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if (empty($name)) $name = $path;
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$path2tmp =& egw_cache::getSession(__CLASS__, 'path2tmp');
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// allow filesystem path only for temp_dir
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$temp_dir = $GLOBALS['egw_info']['server']['temp_dir'].'/';
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if (substr($path, 0, strlen($temp_dir)) == $temp_dir)
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{
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$mode = self::LINK;
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}
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elseif(parse_url($path, PHP_URL_SCHEME) !== 'vfs')
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{
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$path = 'vfs://default'.($path[0] == '/' ? '' : '/').$path;
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}
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// check if file exists and is readable
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if (!file_exists($path) || is_readable($path))
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{
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throw new egw_exception_not_found("'$path' NOT found!");
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}
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// check if file has been shared before
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if (($mode != self::LINK || isset($path2tmp[$path])) &&
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($share = self::$db->select(self::TABLE, '*', array(
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'share_path' => $mode == 'link' ? $path2tmp[$path] : egw_vfs::parse_url($path, PHP_URL_PATH),
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'share_owner' => $GLOBALS['egw_info']['user']['account_id'],
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)+$extra, __LINE__, __FILE__)->fetch()))
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{
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// if yes, just add additional recipients
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$share['share_with'] = $share['share_with'] ? explode(',', $share['share_with']) : array();
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$need_save = false;
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foreach((array)$recipients as $recipient)
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{
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if (!in_array($recipient, $share['share_with']))
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{
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$share['share_with'][] = $recipient;
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$need_save = true;
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}
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}
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$share['share_with'] = implode(',', $share['share_with']);
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if ($need_save)
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{
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self::$db->update(self::TABLE, array(
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'share_with' => $share['share_with'],
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), array(
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'share_id' => $share['share_id'],
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), __LINE__, __FILE__);
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}
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}
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else
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{
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// if not create new share
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if ($mode == 'link')
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{
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$user_tmp = '/home/'.$GLOBALS['egw_info']['user']['account_lid'].'/.tmp';
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if (!egw_vfs::file_exists($user_tmp) && !egw_vfs::mkdir($user_tmp))
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{
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throw new egw_exception_assertion_failed("Could NOT create temp. directory '$user_tmp'!");
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}
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$n = 0;
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do {
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$tmp_file = egw_vfs::concat($user_tmp, ($n?$n.'.':'').egw_vfs::basename($name));
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}
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while(!(is_dir($path) && egw_vfs::mkdir($tmp_file) ||
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!is_dir($path) && ($fp = egw_vfs::fopen($tmp_file, 'x'))) && $n++ < 100);
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if ($n >= 100)
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{
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throw new egw_exception_assertion_failed("Could NOT create temp. file '$tmp_file'!");
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}
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if ($fp) fclose($fp);
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if (is_dir($path) && !egw_vfs::copy_files(array($path), $tmp_file) ||
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!is_dir($path) && !copy($path, egw_vfs::PREFIX.$tmp_file))
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{
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throw new egw_exception_assertion_failed("Could NOT create temp. file '$tmp_file'!");
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}
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// store temp. path in session, to be able to add more recipients
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$path2tmp[$path] = $tmp_file;
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$path = $tmp_file;
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}
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$i = 0;
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while(true) // self::token() can return an existing value
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{
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try {
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self::$db->insert(self::TABLE, $share = array(
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'share_token' => self::token(),
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'share_path' => egw_vfs::parse_url($path, PHP_URL_PATH),
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'share_owner' => $GLOBALS['egw_info']['user']['account_id'],
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'share_with' => implode(',', (array)$recipients),
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'share_created' => time(),
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)+$extra, false, __LINE__, __FILE__);
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$share['share_id'] = self::$db->get_last_insert_id(self::TABLE, 'share_id');
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break;
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}
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catch(egw_exception_db $e) {
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if ($i++ > 3) throw $e;
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unset($e);
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}
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}
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}
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return $share;
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}
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/**
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* Generate link from share or share-token
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*
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* @param string|array $share share or share-token
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* @return string
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*/
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public static function share2link($share)
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{
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if (is_array($share)) $share = $share['share_token'];
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$link = egw::link('/share.php').'/'.$share;
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if ($link[0] == '/')
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{
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$link = ($_SERVER['HTTPS'] ? 'https://' : 'http://').
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($GLOBALS['egw_info']['server']['hostname'] ?
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$GLOBALS['egw_info']['server']['hostname'] : $_SERVER['HTTP_HOST']).
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$link;
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}
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return $link;
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}
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}
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if (file_exists(__DIR__.'/../../filemanager/inc/class.filemanager_ui.inc.php'))
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{
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require_once __DIR__.'/../../filemanager/inc/class.filemanager_ui.inc.php';
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class egw_sharing_filemanager extends filemanager_ui
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{
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/**
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* Get the configured start directory for the current user
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*
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* @return string
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*/
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static function get_home_dir()
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{
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return '/';
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}
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}
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} |