# HG changeset patch
# User Boris Grozev <boris@jitsi.org>
# Date 1609874100 21600
#      Tue Jan 05 13:15:00 2021 -0600
# Node ID f646babfc401494ff33f2126ef6c4df541ebf846
# Parent  456b9f608fcf9667cfba1bd7bf9eba2151af50d0
mod_roster_command: Fix subscription when the "user JID" is a bare domain.

Do not attempt to update the roster when the user is bare domain (e.g. a
component), since they don't have rosters and the attempt results in an error:

$ prosodyctl mod_roster_command subscribe proxy.example.com contact@example.com
xxxxxxxxxxFailed to execute command: Error: /usr/lib/prosody/core/rostermanager.lua:104: attempt to concatenate local 'username' (a nil value)
stack traceback:
	/usr/lib/prosody/core/rostermanager.lua:104: in function 'load_roster'
	/usr/lib/prosody/core/rostermanager.lua:305: in function 'set_contact_pending_out'
	mod_roster_command.lua:44: in function 'subscribe'

diff -r 456b9f608fcf -r f646babfc401 mod_roster_command/mod_roster_command.lua
--- a/mod_roster_command/mod_roster_command.lua	Tue Jan 05 13:49:50 2021 +0000
+++ b/mod_roster_command/mod_roster_command.lua	Tue Jan 05 13:15:00 2021 -0600
@@ -40,8 +40,10 @@
 		storagemanager.initialize_host(user_host);
 		usermanager.initialize_host(user_host);
 	end
-	-- Update user's roster to say subscription request is pending...
-	rostermanager.set_contact_pending_out(user_username, user_host, contact_jid);
+	-- Update user's roster to say subscription request is pending. Bare hosts (e.g. components) don't have rosters.
+    if user_username ~= nil then
+	    rostermanager.set_contact_pending_out(user_username, user_host, contact_jid);
+    end
 	if hosts[contact_host] then
 		if contact_host ~= user_host and hosts[contact_host].users.name == "null" then
 			storagemanager.initialize_host(contact_host);
@@ -51,8 +53,10 @@
 		rostermanager.set_contact_pending_in(contact_username, contact_host, user_jid);
 		-- Update contact's roster to say subscription request approved...
 		rostermanager.subscribed(contact_username, contact_host, user_jid);
-		-- Update user's roster to say subscription request approved...
-		rostermanager.process_inbound_subscription_approval(user_username, user_host, contact_jid);
+		-- Update user's roster to say subscription request approved. Bare hosts (e.g. components) don't have rosters.
+        if user_username ~= nil then
+		    rostermanager.process_inbound_subscription_approval(user_username, user_host, contact_jid);
+        end
 	end
 end