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<?php
/**
* @file mod/dav.php
* @brief Initialize Hubzilla's cloud (SabreDAV).
*
* Module for accessing the DAV storage area from a DAV client.
*/
use Sabre\DAV;
use RedMatrix\RedDAV;
// composer autoloader for SabreDAV
require_once('vendor/autoload.php');
// workaround for HTTP-auth in CGI mode
if (x($_SERVER, 'REDIRECT_REMOTE_USER')) {
$userpass = base64_decode(substr($_SERVER["REDIRECT_REMOTE_USER"], 6)) ;
if(strlen($userpass)) {
list($name, $password) = explode(':', $userpass);
$_SERVER['PHP_AUTH_USER'] = $name;
$_SERVER['PHP_AUTH_PW'] = $password;
}
}
if (x($_SERVER, 'HTTP_AUTHORIZATION')) {
$userpass = base64_decode(substr($_SERVER["HTTP_AUTHORIZATION"], 6)) ;
if(strlen($userpass)) {
list($name, $password) = explode(':', $userpass);
$_SERVER['PHP_AUTH_USER'] = $name;
$_SERVER['PHP_AUTH_PW'] = $password;
}
}
/**
* @brief Fires up the SabreDAV server.
*
* @param App &$a
*/
function dav_init(&$a) {
require_once('include/reddav.php');
if (! is_dir('store'))
os_mkdir('store', STORAGE_DEFAULT_PERMISSIONS, false);
$which = null;
if (argc() > 1)
$which = argv(1);
$profile = 0;
$a->page['htmlhead'] .= '<link rel="alternate" type="application/atom+xml" href="' . $a->get_baseurl() . '/feed/' . $which . '" />' . "\r\n";
if ($which)
profile_load($a, $which, $profile);
$auth = new RedDAV\RedBasicAuth();
$ob_hash = get_observer_hash();
if ($ob_hash) {
if (local_channel()) {
$channel = $a->get_channel();
$auth->setCurrentUser($channel['channel_address']);
$auth->channel_id = $channel['channel_id'];
$auth->channel_hash = $channel['channel_hash'];
$auth->channel_account_id = $channel['channel_account_id'];
if($channel['channel_timezone'])
$auth->setTimezone($channel['channel_timezone']);
}
$auth->observer = $ob_hash;
}
if ($_GET['davguest'])
$_SESSION['davguest'] = true;
$_SERVER['QUERY_STRING'] = str_replace(array('?f=', '&f='), array('', ''), $_SERVER['QUERY_STRING']);
$_SERVER['QUERY_STRING'] = strip_zids($_SERVER['QUERY_STRING']);
$_SERVER['QUERY_STRING'] = preg_replace('/[\?&]davguest=(.*?)([\?&]|$)/ism', '', $_SERVER['QUERY_STRING']);
$_SERVER['REQUEST_URI'] = str_replace(array('?f=', '&f='), array('', ''), $_SERVER['REQUEST_URI']);
$_SERVER['REQUEST_URI'] = strip_zids($_SERVER['REQUEST_URI']);
$_SERVER['REQUEST_URI'] = preg_replace('/[\?&]davguest=(.*?)([\?&]|$)/ism', '', $_SERVER['REQUEST_URI']);
$rootDirectory = new RedDAV\RedDirectory('/', $auth);
// A SabreDAV server-object
$server = new DAV\Server($rootDirectory);
// prevent overwriting changes each other with a lock backend
$lockBackend = new DAV\Locks\Backend\File('store/[data]/locks');
$lockPlugin = new DAV\Locks\Plugin($lockBackend);
$server->addPlugin($lockPlugin);
// The next section of code allows us to bypass prompting for http-auth if a
// FILE is being accessed anonymously and permissions allow this. This way
// one can create hotlinks to public media files in their cloud and anonymous
// viewers won't get asked to login.
// If a DIRECTORY is accessed or there are permission issues accessing the
// file and we aren't previously authenticated via zot, prompt for HTTP-auth.
// This will be the default case for mounting a DAV directory.
// In order to avoid prompting for passwords for viewing a DIRECTORY, add
// the URL query parameter 'davguest=1'.
$isapublic_file = false;
$davguest = ((x($_SESSION, 'davguest')) ? true : false);
if ((! $auth->observer) && ($_SERVER['REQUEST_METHOD'] === 'GET')) {
try {
$x = RedFileData('/' . $a->cmd, $auth);
if($x instanceof RedDAV\RedFile)
$isapublic_file = true;
}
catch (Exception $e) {
$isapublic_file = false;
}
}
if ((! $auth->observer) && (! $isapublic_file) && (! $davguest)) {
try {
$auth->Authenticate($server, t('$Projectname channel'));
}
catch (Exception $e) {
logger('mod_cloud: auth exception' . $e->getMessage());
http_status_exit($e->getHTTPCode(), $e->getMessage());
}
}
require_once('include/RedDAV/RedBrowser.php');
// provide a directory view for the cloud in Hubzilla
$browser = new RedDAV\RedBrowser($auth);
$auth->setBrowserPlugin($browser);
// Experimental QuotaPlugin
// require_once('include/RedDAV/QuotaPlugin.php');
// $server->addPlugin(new RedDAV\QuotaPlugin($auth));
// All we need to do now, is to fire up the server
$server->exec();
killme();
}
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