provide option to block the public stream unless authenticated, since there could be legal issues with unmoderated content

Zotlabs/Module/Pubstream.php

@@ -12,11 +12,10 @@ class Pubstream extends \Zotlabs\Web\Controller {
 		if($load)
 			$_SESSION['loadtime'] = datetime_convert();
 
-	
-		if(observer_prohibited(true)) {
-				return login();
+		if((observer_prohibited(true)) || (! (intval(get_config('system','open_pubstream',1))) && get_observer_hash())) {
+			return login();
 		}
-	
+
 		$site_firehose = ((intval(get_config('system','site_firehose',0))) ? true : false);
 		$net_firehose  = ((get_config('system','disable_discover_tab',1)) ? false : true);