--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_adhoc_groups/mod_adhoc_groups.lua	Tue Nov 21 15:01:18 2017 +0100
@@ -0,0 +1,42 @@
+local rostermanager = require"core.rostermanager";
+local jid_join = require"util.jid".join;
+local host = module.host;
+local sessions = prosody.hosts[host].sessions;
+
+-- Make a *one-way* subscription. User will see when contact is online,
+-- contact will not see when user is online.
+local function subscribe(user, contact)
+	local user_jid, contact_jid = jid_join(user, host), jid_join(contact, host);
+
+	-- Update user's roster to say subscription request is pending...
+	rostermanager.set_contact_pending_out(user, host, contact_jid);
+	-- Update contact's roster to say subscription request is pending...
+	rostermanager.set_contact_pending_in(contact, host, user_jid);
+	-- Update contact's roster to say subscription request approved...
+	rostermanager.subscribed(contact, host, user_jid);
+	-- Update user's roster to say subscription request approved...
+	rostermanager.process_inbound_subscription_approval(user, host, contact_jid);
+
+	-- Push updates to both rosters
+	rostermanager.roster_push(user, host, contact_jid);
+	rostermanager.roster_push(contact, host, user_jid);
+end
+
+
+module:hook("resource-bind", function(event)
+	local session = event.session;
+	local user = session.username;
+	local user_jid = jid_join(user, host);
+	for contact in pairs(sessions) do
+		if contact ~= user then
+			local contact_jid = jid_join(contact, host);
+			if not rostermanager.is_contact_subscribed(user, host, contact_jid) then
+				subscribe(contact, user);
+			end
+			if not rostermanager.is_contact_subscribed(contact, host, user_jid) then
+				subscribe(user, contact);
+			end
+		end
+	end
+end);
+