forked from extern/egroupware
643 lines
20 KiB
PHP
643 lines
20 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) 2014/15 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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* Existing user sessions are kept whenever possible by an additional mount into regular VFS:
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* - share owner is current user (no problems with rights, they simply match)
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* - share owner has owner-right for share: we create a temp. eACL for current user
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* --> in all other cases session will be replaced with one of the anonymous user,
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* as we dont support mounting with rights of share owner (VFS uses Vfs::$user!)
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*
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* @todo handle mounts of an entry directory /apps/$app/$id
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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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* Dropbox uses just 15 chars (letters/numbers 5-6 bit), php sessions use 32 chars (hex = 4bits),
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* so 32 chars of base64 = 6bits should be plenty.
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*/
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const TOKEN_LENGTH = 32;
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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 = $share;
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}
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/**
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* Get token from url
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*/
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public static function get_token()
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{
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// WebDAV has no concept of a query string and clients (including cadaver)
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// seem to pass '?' unencoded, so we need to extract the path info out
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// of the request URI ourselves
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// if request URI contains a full url, remove schema and domain
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$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*/) = preg_split('|[/?]|', $path_info, 3);
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return $token;
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}
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/**
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* Get root of share
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*
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* @return string
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*/
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public function get_root()
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{
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return $this->share['share_root'];
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}
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/**
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* Create sharing session
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*
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* @param boolean $keep_session =false false: create a new session, true: try mounting it into existing (already verified) session
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* @return string with sessionid, does NOT return if no session created
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*/
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public static function create_session($keep_session=false)
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{
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self::$db = $GLOBALS['egw']->db;
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$token = self::get_token();
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// are we called from header include, because session did not verify
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// --> check if it verifys for our token
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if ($token && !$keep_session)
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{
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$_SERVER['PHP_AUTH_USER'] = $token;
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if (!isset($_SERVER['PHP_AUTH_PW'])) $_SERVER['PHP_AUTH_PW'] = '';
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unset($GLOBALS['egw_info']['flags']['autocreate_session_callback']);
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if ($GLOBALS['egw']->session->verify() && isset($GLOBALS['egw']->sharing) &&
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$GLOBALS['egw']->sharing->share['share_token'] === $token)
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{
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return $GLOBALS['egw']->session->sessionid;
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}
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}
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if (empty($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: $status", true);
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echo "<html>\n<head>\n<title>401 Unauthorized</title>\n<body>\nAuthorization failed.\n</body>\n</html>\n";
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common::egw_exit();
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}
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$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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if ($keep_session) // add share to existing session
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{
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$share['share_root'] = '/'.$share['share_token'];
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// if current user is not the share owner, we need to give him access to mounted share
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if (egw_vfs::$user != $share['share_owner'])
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{
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// check if sharing user has owner rights for shared path
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egw_vfs::$user = $share['share_owner'];
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egw_vfs::clearstatcache();
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if (egw_vfs::has_owner_rights($share['share_path']))
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{
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$rights = $share['share_writable'] && egw_vfs::is_writable($share['share_path']) ? 7 : 5;
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egw_vfs::$user = $GLOBALS['egw']->session->account_id;
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egw_vfs::eacl($share['share_root'], $rights, egw_vfs::$user, true); // true = session-only, not permanent
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}
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// if not, we must not use an eacl, as it grants recursive rights!
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// (one could eg. create a writable share for / and use it to escalate his own rights)
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// --> create a new session with propper rights (loosing current session)
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else
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{
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$keep_session = false;
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}
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}
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}
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if (!$keep_session) // do NOT change to else, as we might have set $keep_session=false!
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{
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// create session without checking auth: create(..., false, false)
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if (!($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['share_root'] = '/';
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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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$GLOBALS['egw_info']['user']['vfs_user'] = egw_vfs::$user = $share['share_owner'];
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}
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// mounting share
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egw_vfs::$is_root = true;
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if (!egw_vfs::mount($share['resolve_url'], $share['share_root'], false, false, !$keep_session))
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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::$is_root = false;
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$GLOBALS['egw_info']['server']['vfs_fstab'] = egw_vfs::mount();
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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($share);
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// for an existing session we need to store modified egw and egw_info again in session
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if ($keep_session)
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{
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$_SESSION[egw_session::EGW_INFO_CACHE] = $GLOBALS['egw_info'];
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unset($_SESSION[egw_session::EGW_INFO_CACHE]['flags']); // dont save the flags, they change on each request
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$_SESSION[egw_session::EGW_OBJECT_CACHE] = serialize($GLOBALS['egw']);
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}
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return $sessionid;
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}
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/**
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* Server a request on a share specified in REQUEST_URI
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*/
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public function ServeRequest()
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{
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// sharing is for a different share, change to current share
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if ($this->share['share_token'] !== self::get_token())
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{
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self::create_session($GLOBALS['egw']->session->session_flags === 'N');
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return $GLOBALS['egw']->sharing->ServeRequest();
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}
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// use pure WebDAV for everything but GET requests to directories
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if (!egw_vfs::is_dir($this->share['share_root']) || $_SERVER['REQUEST_METHOD'] != 'GET' ||
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// or unsupported browsers like ie < 10
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html::$user_agent == 'msie' && html::$ua_version < 10.0 ||
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// or if no filemanager installed (WebDAV has own autoindex)
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!file_exists(__DIR__.'/../../filemanager/inc/class.filemanager_ui.inc.php'))
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{
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// send a content-disposition header, so browser knows how to name downloaded file
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if (!egw_vfs::is_dir($this->share['share_root']))
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{
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html::content_disposition_header(egw_vfs::basename($this->share['share_path']), false);
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}
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//$GLOBALS['egw']->session->commit_session();
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$webdav_server = new vfs_webdav_server();
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$webdav_server->ServeRequest(egw_vfs::concat($this->share['share_root'], $this->share['share_token']));
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return;
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}
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// run full eTemplate2 UI for directories
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$_GET['path'] = $this->share['share_root'];
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$GLOBALS['egw_info']['user']['preferences']['filemanager']['nm_view'] = 'tile';
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$_GET['cd'] = 'no';
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$GLOBALS['egw_info']['flags']['js_link_registry'] = true;
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egw_framework::includeCSS('/filemanager/templates/default/sharing.css');
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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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do {
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$token = function_exists('openssl_random_pseudo_bytes') ?
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base64_encode(openssl_random_pseudo_bytes(3*self::TOKEN_LENGTH/4)) :
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auth::randomstring(self::TOKEN_LENGTH);
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// base64 can contain chars not allowed in our vfs-urls eg. / or #
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} while ($token != egw_vfs::encodePathComponent($token));
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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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$exists = file_exists($path) && is_readable($path);
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}
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else
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{
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if(parse_url($path, PHP_URL_SCHEME) !== 'vfs')
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{
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$path = 'vfs://default'.($path[0] == '/' ? '' : '/').$path;
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}
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$vfs_path = egw_vfs::parse_url($path, PHP_URL_PATH);
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$exists = egw_vfs::file_exists($vfs_path) && egw_vfs::is_readable($vfs_path);
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}
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// check if file exists and is readable
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if (!$exists)
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{
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throw new egw_exception_not_found("'$path' NOT found!");
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}
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// check if file has been shared before, with identical attributes
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if (($mode != self::LINK || isset($path2tmp[$path])) &&
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($share = self::$db->select(self::TABLE, '*', $extra+array(
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'share_path' => $mode == 'link' ? $path2tmp[$path] : $vfs_path,
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'share_owner' => $GLOBALS['egw_info']['user']['account_id'],
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'share_expires' => null,
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'share_passwd' => null,
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'share_writable'=> false,
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), __LINE__, __FILE__)->fetch()))
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{
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// if yes, just add additional recipients
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$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) && (!egw_vfs::file_exists($tmp_file) && ($fp = egw_vfs::fopen($tmp_file, 'x')) ||
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// do not copy identical files again to users tmp dir, just re-use them
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egw_vfs::file_exists($tmp_file) && egw_vfs::compare(egw_vfs::PREFIX.$tmp_file, $path))) && $n++ < 100);
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if ($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 = $tmp_file;
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// if not already installed, install periodic cleanup of tmp files
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$async = new asyncservice();
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if (!$async->read('egw_sharing-tmp-cleanup'))
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{
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$async->set_timer(array('day' => 28),'egw_sharing-tmp_cleanup','egw_sharing::tmp_cleanup',null);
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}
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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' => $GLOBALS['egw_info']['user']['account_id'],
|
|
'share_with' => implode(',', (array)$recipients),
|
|
'share_created' => time(),
|
|
)+$extra, false, __LINE__, __FILE__);
|
|
|
|
$share['share_id'] = self::$db->get_last_insert_id(self::TABLE, 'share_id');
|
|
break;
|
|
}
|
|
catch(egw_exception_db $e) {
|
|
if ($i++ > 3) throw $e;
|
|
unset($e);
|
|
}
|
|
}
|
|
}
|
|
return $share;
|
|
}
|
|
|
|
/**
|
|
* so_sql instance for egw_sharing table
|
|
*
|
|
* @var so_sql
|
|
*/
|
|
protected static $so;
|
|
|
|
/**
|
|
* Get a so_sql instance initialised for shares
|
|
*/
|
|
public static function so()
|
|
{
|
|
if (!isset(self::$so))
|
|
{
|
|
self::$so = new so_sql('phpgwapi', self::TABLE, null, '', true);
|
|
self::$so->set_times('string');
|
|
}
|
|
return self::$so;
|
|
}
|
|
|
|
/**
|
|
* Delete specified shares and unlink temp. files
|
|
*
|
|
* @param int|array $keys
|
|
* @return int number of deleted shares
|
|
*/
|
|
public static function delete($keys)
|
|
{
|
|
self::$db = $GLOBALS['egw']->db;
|
|
|
|
if (is_scalar($keys)) $keys = array('share_id' => $keys);
|
|
|
|
// get all temp. files, to be able to delete them
|
|
$tmp_paths = array();
|
|
foreach(self::$db->select(self::TABLE, 'share_path', array(
|
|
"share_path LIKE '/home/%/.tmp/%'")+$keys, __LINE__, __FILE__, false) as $row)
|
|
{
|
|
$tmp_paths[] = $row['share_path'];
|
|
}
|
|
|
|
// delete specified shares
|
|
self::$db->delete(self::TABLE, $keys, __LINE__, __FILE__);
|
|
$deleted = self::$db->affected_rows();
|
|
|
|
// check if temp. files are used elsewhere
|
|
if ($tmp_paths)
|
|
{
|
|
foreach(self::$db->select(self::TABLE, 'share_path,COUNT(*) AS cnt', array(
|
|
'share_path' => $tmp_paths,
|
|
), __LINE__, __FILE__, false, 'GROUP BY share_path') as $row)
|
|
{
|
|
if (($key = array_search($row['share_path'], $tmp_paths)))
|
|
{
|
|
unset($tmp_paths[$key]);
|
|
}
|
|
}
|
|
// if not delete them
|
|
foreach($tmp_paths as $path)
|
|
{
|
|
egw_vfs::remove($path);
|
|
}
|
|
}
|
|
return $deleted;
|
|
}
|
|
|
|
/**
|
|
* Home long to keep temp. files: 100 day
|
|
*/
|
|
const TMP_KEEP = 8640000;
|
|
|
|
/**.
|
|
* Periodic (monthly) cleanup of temporary sharing files (download link)
|
|
*
|
|
* Exlicit expireds shares are delete, as ones created over 100 days ago and last accessed over 100 days ago.
|
|
*/
|
|
public static function tmp_cleanup()
|
|
{
|
|
if (!isset(self::$db)) self::$db = $GLOBALS['egw']->db;
|
|
egw_vfs::$is_root = true;
|
|
|
|
try {
|
|
$cols = array(
|
|
'share_path',
|
|
'MAX(share_expires) AS share_expires',
|
|
'MAX(share_created) AS share_created',
|
|
'MAX(share_last_accessed) AS share_last_accessed',
|
|
);
|
|
if (($group_concat = self::$db->group_concat('share_id'))) $cols[] = $group_concat.' AS share_id';
|
|
// remove expired tmp-files unconditionally
|
|
$having = 'HAVING share_expires < '.self::$db->quote(self::$db->to_timestamp(time())).' OR '.
|
|
// remove without expiration date, when created over 100 days ago AND
|
|
'share_expires IS NULL AND share_created < '.self::$db->quote(self::$db->to_timestamp(time()-self::TMP_KEEP)). ' AND '.
|
|
// (last accessed over 100 days ago OR never)
|
|
'(share_last_accessed IS NULL OR share_last_accessed < '.self::$db->quote(self::$db->to_timestamp(time()-self::TMP_KEEP)).')';
|
|
|
|
foreach(self::$db->select(self::TABLE, $cols, array(
|
|
"share_path LIKE '/home/%/.tmp/%'",
|
|
), __LINE__, __FILE__, false, 'GROUP BY share_path '.$having) as $row)
|
|
{
|
|
egw_vfs::remove($row['share_path']);
|
|
|
|
if ($group_concat)
|
|
{
|
|
$share_ids = $row['share_id'] ? explode(',', $row['share_id']) : array();
|
|
}
|
|
else
|
|
{
|
|
$share_ids = array();
|
|
foreach(self::$db->selec(self::TABLE, 'share_id', array(
|
|
'share_path' => $row['share_path'],
|
|
), __LINE__, __FILE__) as $id)
|
|
{
|
|
$share_ids[] = $id['share_id'];
|
|
}
|
|
}
|
|
if ($share_ids)
|
|
{
|
|
self::$db->delete(self::TABLE, array('share_id' => $share_ids), __LINE__, __FILE__);
|
|
}
|
|
}
|
|
}
|
|
catch (Exception $e) {
|
|
unset($e);
|
|
}
|
|
egw_vfs::$is_root = false;
|
|
}
|
|
|
|
/**
|
|
* Generate link from share or share-token
|
|
*
|
|
* @param string|array $share share or share-token
|
|
* @return string
|
|
*/
|
|
public static function share2link($share)
|
|
{
|
|
if (is_array($share)) $share = $share['share_token'];
|
|
|
|
$link = egw::link('/share.php').'/'.$share;
|
|
if ($link[0] == '/')
|
|
{
|
|
$link = ($_SERVER['HTTPS'] ? 'https://' : 'http://').
|
|
($GLOBALS['egw_info']['server']['hostname'] ?
|
|
$GLOBALS['egw_info']['server']['hostname'] : $_SERVER['HTTP_HOST']).
|
|
$link;
|
|
}
|
|
return $link;
|
|
}
|
|
}
|
|
|
|
if (file_exists(__DIR__.'/../../filemanager/inc/class.filemanager_ui.inc.php'))
|
|
{
|
|
require_once __DIR__.'/../../filemanager/inc/class.filemanager_ui.inc.php';
|
|
|
|
class egw_sharing_filemanager extends filemanager_ui
|
|
{
|
|
/**
|
|
* Get the configured start directory for the current user
|
|
*
|
|
* @return string
|
|
*/
|
|
static function get_home_dir()
|
|
{
|
|
return $GLOBALS['egw']->sharing->get_root();
|
|
}
|
|
}
|
|
} |