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<?php
namespace OCA\Files_Sharing;
use OC_Config;
use PasswordHash;
class Helper {
/**
* Sets up the filesystem and user for public sharing
* @param string $token string share token
* @param string $relativePath optional path relative to the share
* @param string $password optional password
*/
public static function setupFromToken($token, $relativePath = null, $password = null) {
\OC_User::setIncognitoMode(true);
$linkItem = \OCP\Share::getShareByToken($token);
if($linkItem === false || ($linkItem['item_type'] !== 'file' && $linkItem['item_type'] !== 'folder')) {
\OC_Response::setStatus(404);
\OC_Log::write('core-preview', 'Passed token parameter is not valid', \OC_Log::DEBUG);
exit;
}
if(!isset($linkItem['uid_owner']) || !isset($linkItem['file_source'])) {
\OC_Response::setStatus(500);
\OC_Log::write('core-preview', 'Passed token seems to be valid, but it does not contain all necessary information . ("' . $token . '")', \OC_Log::WARN);
exit;
}
$rootLinkItem = \OCP\Share::resolveReShare($linkItem);
$path = null;
if (isset($rootLinkItem['uid_owner'])) {
\OCP\JSON::checkUserExists($rootLinkItem['uid_owner']);
\OC_Util::tearDownFS();
\OC_Util::setupFS($rootLinkItem['uid_owner']);
$path = \OC\Files\Filesystem::getPath($linkItem['file_source']);
}
if ($path === null) {
\OCP\Util::writeLog('share', 'could not resolve linkItem', \OCP\Util::DEBUG);
\OC_Response::setStatus(404);
\OCP\JSON::error(array('success' => false));
exit();
}
if (!isset($linkItem['item_type'])) {
\OCP\Util::writeLog('share', 'No item type set for share id: ' . $linkItem['id'], \OCP\Util::ERROR);
\OC_Response::setStatus(404);
\OCP\JSON::error(array('success' => false));
exit();
}
if (isset($linkItem['share_with'])) {
if (!self::authenticate($linkItem, $password)) {
\OC_Response::setStatus(403);
\OCP\JSON::error(array('success' => false));
exit();
}
}
$basePath = $path;
if ($relativePath !== null && \OC\Files\Filesystem::isReadable($basePath . $relativePath)) {
$path .= \OC\Files\Filesystem::normalizePath($relativePath);
}
return array(
'linkItem' => $linkItem,
'basePath' => $basePath,
'realPath' => $path
);
}
/**
* Authenticate link item with the given password
* or with the session if no password was given.
* @param array $linkItem link item array
* @param string $password optional password
*
* @return boolean true if authorized, false otherwise
*/
public static function authenticate($linkItem, $password) {
if ($password !== null) {
if ($linkItem['share_type'] == \OCP\Share::SHARE_TYPE_LINK) {
// Check Password
$forcePortable = (CRYPT_BLOWFISH != 1);
$hasher = new PasswordHash(8, $forcePortable);
if (!($hasher->CheckPassword($password.OC_Config::getValue('passwordsalt', ''),
$linkItem['share_with']))) {
return false;
} else {
// Save item id in session for future requests
\OC::$session->set('public_link_authenticated', $linkItem['id']);
}
} else {
\OCP\Util::writeLog('share', 'Unknown share type '.$linkItem['share_type']
.' for share id '.$linkItem['id'], \OCP\Util::ERROR);
return false;
}
}
else {
// not authenticated ?
if ( ! \OC::$session->exists('public_link_authenticated')
|| \OC::$session->get('public_link_authenticated') !== $linkItem['id']) {
return false;
}
}
return true;
}
public static function getSharesFromItem($target) {
$result = array();
$owner = \OC\Files\Filesystem::getOwner($target);
\OC\Files\Filesystem::initMountPoints($owner);
$info = \OC\Files\Filesystem::getFileInfo($target);
$ownerView = new \OC\Files\View('/'.$owner.'/files');
if ( $owner != \OCP\User::getUser() ) {
$path = $ownerView->getPath($info['fileid']);
} else {
$path = $target;
}
$ids = array();
while ($path !== dirname($path)) {
$info = $ownerView->getFileInfo($path);
if ($info instanceof \OC\Files\FileInfo) {
$ids[] = $info['fileid'];
} else {
\OCP\Util::writeLog('sharing', 'No fileinfo available for: ' . $path, \OCP\Util::WARN);
}
$path = dirname($path);
}
if (!empty($ids)) {
$idList = array_chunk($ids, 99, true);
foreach ($idList as $subList) {
$statement = "SELECT `share_with`, `share_type`, `file_target` FROM `*PREFIX*share` WHERE `file_source` IN (" . implode(',', $subList) . ") AND `share_type` IN (0, 1, 2)";
$query = \OCP\DB::prepare($statement);
$r = $query->execute();
$result = array_merge($result, $r->fetchAll());
}
}
return $result;
}
public static function getUidAndFilename($filename) {
$uid = \OC\Files\Filesystem::getOwner($filename);
\OC\Files\Filesystem::initMountPoints($uid);
if ( $uid != \OCP\User::getUser() ) {
$info = \OC\Files\Filesystem::getFileInfo($filename);
$ownerView = new \OC\Files\View('/'.$uid.'/files');
$filename = $ownerView->getPath($info['fileid']);
}
return array($uid, $filename);
}
/**
* Format a path to be relative to the /user/files/ directory
* @param string $path the absolute path
* @return string e.g. turns '/admin/files/test.txt' into 'test.txt'
*/
public static function stripUserFilesPath($path) {
$trimmed = ltrim($path, '/');
$split = explode('/', $trimmed);
// it is not a file relative to data/user/files
if (count($split) < 3 || $split[1] !== 'files') {
return false;
}
$sliced = array_slice($split, 2);
$relPath = implode('/', $sliced);
return $relPath;
}
}
|
