Fix appservice username check

clientapi/routing/directory.go

@@ -139,11 +139,17 @@ func SetLocalAlias(
 	// TODO: This code should eventually be refactored with:
 	// 1. The new method for checking for things matching an AS's namespace
 	// 2. Using an overall Regex object for all AS's just like we did for usernames
-
+	reqUserID, _, err := gomatrixserverlib.SplitID('@', device.UserID)
+	if err != nil {
+		return util.JSONResponse{
+			Code: http.StatusBadRequest,
+			JSON: jsonerror.BadJSON("User ID must be in the form '@localpart:domain'"),
+		}
+	}
 	for _, appservice := range cfg.Derived.ApplicationServices {
 		// Don't prevent AS from creating aliases in its own namespace
 		// Note that Dendrite uses SenderLocalpart as UserID for AS users
-		if device.UserID != appservice.SenderLocalpart {
+		if reqUserID != appservice.SenderLocalpart {
 			if aliasNamespaces, ok := appservice.NamespaceMap["aliases"]; ok {
 				for _, namespace := range aliasNamespaces {
 					if namespace.Exclusive && namespace.RegexpObject.MatchString(alias) {

sytest-blacklist

@@ -24,6 +24,7 @@ Local device key changes get to remote servers with correct prev_id
 
 # Flakey
 Local device key changes appear in /keys/changes
+/context/ with lazy_load_members filter works
 
 # we don't support groups
 Remove group category

sytest-whitelist

@@ -601,3 +601,8 @@ Can query remote device keys using POST after notification
 Device deletion propagates over federation
 Get left notifs in sync and /keys/changes when other user leaves
 Remote banned user is kicked and may not rejoin until unbanned
+AS can make room aliases
+AS-ghosted users can use rooms via AS
+AS-ghosted users can use rooms themselves
+Accesing an AS-hosted room alias asks the AS server
+Events in rooms with AS-hosted room aliases are sent to AS server