+function add_to_roster(session, jid, item)
+ if session.roster then
+ local old_item = session.roster[jid];
+ session.roster[jid] = item;
+ if save_roster(session.username, session.host) then
+ return true;
+ else
+ session.roster[jid] = old_item;
+ return nil, "wait", "internal-server-error", "Unable to save roster";
+ end
+ else
+ return nil, "auth", "not-authorized", "Session's roster not loaded";
+ end
+end
+
+function remove_from_roster(session, jid)
+ if session.roster then
+ local old_item = session.roster[jid];
+ session.roster[jid] = nil;
+ if save_roster(session.username, session.host) then
+ return true;
+ else
+ session.roster[jid] = old_item;
+ return nil, "wait", "internal-server-error", "Unable to save roster";
+ end
+ else
+ return nil, "auth", "not-authorized", "Session's roster not loaded";
+ end
+end
+
+function roster_push(username, host, jid)
+ local roster = jid and jid ~= "pending" and hosts[host] and hosts[host].sessions[username] and hosts[host].sessions[username].roster;
+ if roster then
+ local item = hosts[host].sessions[username].roster[jid];
+ local stanza = st.iq({type="set"});
+ stanza:tag("query", {xmlns = "jabber:iq:roster", ver = tostring(roster[false].version or "1") });
+ if item then
+ stanza:tag("item", {jid = jid, subscription = item.subscription, name = item.name, ask = item.ask});
+ for group in pairs(item.groups) do
+ stanza:tag("group"):text(group):up();
+ end
+ else
+ stanza:tag("item", {jid = jid, subscription = "remove"});
+ end
+ stanza:up(); -- move out from item
+ stanza:up(); -- move out from stanza
+ -- stanza ready
+ for _, session in pairs(hosts[host].sessions[username].sessions) do
+ if session.interested then
+ -- FIXME do we need to set stanza.attr.to?
+ session.send(stanza);
+ end
+ end
+ end
+end
+
+function load_roster(username, host)
+ local jid = username.."@"..host;
+ log("debug", "load_roster: asked for: %s", jid);
+ local user = bare_sessions[jid];
+ local roster;
+ if user then
+ roster = user.roster;
+ if roster then return roster; end
+ log("debug", "load_roster: loading for new user: %s@%s", username, host);
+ else -- Attempt to load roster for non-loaded user
+ log("debug", "load_roster: loading for offline user: %s@%s", username, host);
+ end
+ local data, err = datamanager.load(username, host, "roster");
+ roster = data or {};
+ if user then user.roster = roster; end
+ if not roster[false] then roster[false] = { broken = err or nil }; end
+ if roster[jid] then
+ roster[jid] = nil;
+ log("warn", "roster for %s has a self-contact", jid);
+ end
+ if not err then
+ hosts[host].events.fire_event("roster-load", username, host, roster);
+ end
+ return roster, err;
+end
+
+function save_roster(username, host, roster)
+ log("debug", "save_roster: saving roster for %s@%s", username, host);
+ if not roster then
+ roster = hosts[host] and hosts[host].sessions[username] and hosts[host].sessions[username].roster;
+ --if not roster then
+ -- --roster = load_roster(username, host);
+ -- return true; -- roster unchanged, no reason to save
+ --end
+ end
+ if roster then
+ local metadata = roster[false];
+ if not metadata then
+ metadata = {};
+ roster[false] = metadata;
+ end
+ if metadata.version ~= true then
+ metadata.version = (metadata.version or 0) + 1;
+ end
+ if roster[false].broken then return nil, "Not saving broken roster" end
+ return datamanager.store(username, host, "roster", roster);
+ end
+ log("warn", "save_roster: user had no roster to save");
+ return nil;
+end
+
+function process_inbound_subscription_approval(username, host, jid)
+ local roster = load_roster(username, host);
+ local item = roster[jid];
+ if item and item.ask then
+ if item.subscription == "none" then
+ item.subscription = "to";
+ else -- subscription == from
+ item.subscription = "both";
+ end
+ item.ask = nil;
+ return save_roster(username, host, roster);
+ end
+end
+
+function process_inbound_subscription_cancellation(username, host, jid)
+ local roster = load_roster(username, host);
+ local item = roster[jid];
+ local changed = nil;
+ if is_contact_pending_out(username, host, jid) then
+ item.ask = nil;
+ changed = true;
+ end
+ if item then
+ if item.subscription == "to" then
+ item.subscription = "none";
+ changed = true;
+ elseif item.subscription == "both" then
+ item.subscription = "from";
+ changed = true;
+ end
+ end
+ if changed then
+ return save_roster(username, host, roster);
+ end
+end
+
+function process_inbound_unsubscribe(username, host, jid)
+ local roster = load_roster(username, host);
+ local item = roster[jid];
+ local changed = nil;
+ if is_contact_pending_in(username, host, jid) then
+ roster.pending[jid] = nil; -- TODO maybe delete roster.pending if empty?
+ changed = true;
+ end
+ if item then
+ if item.subscription == "from" then
+ item.subscription = "none";
+ changed = true;
+ elseif item.subscription == "both" then
+ item.subscription = "to";
+ changed = true;
+ end
+ end
+ if changed then
+ return save_roster(username, host, roster);
+ end
+end
+
+local function _get_online_roster_subscription(jidA, jidB)
+ local user = bare_sessions[jidA];
+ local item = user and (user.roster[jidB] or { subscription = "none" });
+ return item and item.subscription;
+end
+function is_contact_subscribed(username, host, jid)
+ do
+ local selfjid = username.."@"..host;
+ local subscription = _get_online_roster_subscription(selfjid, jid);
+ if subscription then return (subscription == "both" or subscription == "from"); end
+ local subscription = _get_online_roster_subscription(jid, selfjid);
+ if subscription then return (subscription == "both" or subscription == "to"); end
+ end
+ local roster, err = load_roster(username, host);
+ local item = roster[jid];
+ return item and (item.subscription == "from" or item.subscription == "both"), err;
+end
+
+function is_contact_pending_in(username, host, jid)
+ local roster = load_roster(username, host);
+ return roster.pending and roster.pending[jid];
+end
+function set_contact_pending_in(username, host, jid, pending)
+ local roster = load_roster(username, host);
+ local item = roster[jid];
+ if item and (item.subscription == "from" or item.subscription == "both") then
+ return; -- false
+ end
+ if not roster.pending then roster.pending = {}; end
+ roster.pending[jid] = true;
+ return save_roster(username, host, roster);
+end
+function is_contact_pending_out(username, host, jid)
+ local roster = load_roster(username, host);
+ local item = roster[jid];
+ return item and item.ask;
+end
+function set_contact_pending_out(username, host, jid) -- subscribe
+ local roster = load_roster(username, host);
+ local item = roster[jid];
+ if item and (item.ask or item.subscription == "to" or item.subscription == "both") then
+ return true;
+ end
+ if not item then
+ item = {subscription = "none", groups = {}};
+ roster[jid] = item;
+ end
+ item.ask = "subscribe";
+ log("debug", "set_contact_pending_out: saving roster; set %s@%s.roster[%q].ask=subscribe", username, host, jid);
+ return save_roster(username, host, roster);