mix-pam: Add support for XEP-0405 MIX-PAM
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08fd566334
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263
mod_mix_pam/mod_mix_pam.lua
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263
mod_mix_pam/mod_mix_pam.lua
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if module:get_host() ~= "*" then
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module:log("error", "mix_pam should be used on the user host!");
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end
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local jid = require("util.jid");
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local st = require("util.stanza");
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-- Persistent storage
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local mix_pam = module:open_store("mix_pam", "keyval");
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-- Runtime data
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local mix_hosts = {};
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-- Namespaceing
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local mix_pam_xmlns = "urn:xmpp:mix:pam:2";
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module:add_feature(mix_pam_xmlns);
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-- NOTE: To show that we archive messages
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-- module:add_feature(mix_pam_xmlns.."#archive");
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function add_mix_host(host)
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if mix_hosts[host] ~= nil then
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mix_hosts[host] = mix_hosts[host] + 1;
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module:log("debug", "Known MIX host has a new user");
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else
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module:log("debug", "Added %s as a new MIX host", host);
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mix_hosts[host] = 1;
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end
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end
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function remove_mix_host(host)
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if mix_hosts[host] ~= nil then
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local count = mix_hosts[host];
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if count == 1 then
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mix_hosts[host] = nil;
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module:log("debug", "Removing %s as a mix host", host);
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else
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mix_hosts[host] = count - 1;
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module:log("debug", "Decrementing %s's user counter", host);
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end
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else
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module:log("debug", "Attempt to remove unknown MIX host");
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end
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end
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function is_mix_host(host)
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return mix_hosts[host] ~= nil;
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end
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function is_mix_message(stanza)
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return stanza:get_child("mix", "urn:xmpp:mix:core:1") ~= nil;
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end
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function module.load()
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mix_hosts = mix_pam:get("hosts");
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module:log("info", "Loaded known MIX hosts");
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if mix_hosts == nil then
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module:log("info", "No known MIX hosts loaded");
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mix_hosts = {};
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return;
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end
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for _, host in pairs(mix_hosts) do
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module:log("debug", "Known host: %s", host);
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end
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end
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local client_state_tracker = {}; -- [stanza ID] -> resource
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function add_state(id, resource)
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client_state_tracker[id] = resource;
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module:log("debug", "Adding a resource %s for id %s", resource, id);
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end
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function has_state(id)
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return client_state_tracker[id] ~= nil;
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end
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function pop_state(id)
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module:log("debug", "Popping a resource for stanza id %s", id);
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if has_state(id) then
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local resource = client_state_tracker[id];
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client_state_tracker[id] = nil;
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return resource;
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end
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return nil;
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end
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module:hook("iq/self", function(event)
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local stanza = event.stanza;
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if #stanza.tags == 0 then return; end
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if stanza:get_child("client-join", mix_pam_xmlns) ~= nil then
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return handle_client_join(event);
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elseif stanza:get_child("client-leave", mix_pam_xmlns) ~= nil then
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return handle_client_leave(event);
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end
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end);
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function handle_client_join(event)
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-- Client requests to join
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module:log("debug", "client-join received");
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local stanza, origin = event.stanza, event.origin;
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local from, to = jid.bare(stanza.attr.from), jid.bare(stanza.attr.to);
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local client_join = stanza:get_child("client-join", mix_pam_xmlns);
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if client_join.attr.channel == nil then
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origin.send(st.error_reply(stanza, "cancel", "bad-request", "No channel specified"));
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return true;
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end
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local join = client_join:get_child("join", "urn:xmpp:mix:core:1");
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if join == nil then
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origin.send(st.error_reply(stanza, "cancel", "bad-request", "No join stanza"));
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return true;
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end
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-- Transform the client-join into a join
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local join_iq = st.iq({ type = "set", from = jid.bare(stanza.attr.from), to = client_join.attr.channel, id = stanza.attr.id, xmlns = "jabber:client" });
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join_iq:add_child(join);
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add_state(stanza.attr.id, jid.resource(stanza.attr.from));
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module:send(join_iq);
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return true;
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end
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function handle_client_leave(event)
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-- Client requests to leave
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module:log("debug", "client-leave received");
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local stanza, origin = event.stanza, event.origin;
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local from, to = jid.bare(stanza.attr.from), jid.bare(stanza.attr.to);
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local client_leave = stanza:get_child("client-leave", mix_pam_xmlns);
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if client_leave.attr.channel == nil then
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origin.send(st.error_reply(stanza, "cancel", "bad-request", "No channel specified"));
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return true;
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end
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local leave = client_leave:get_child("leave", "urn:xmpp:mix:core:1");
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if leave == nil then
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origin.send(st.error_reply(stanza, "cancel", "bad-request", "No leave stanza"));
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return true;
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end
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-- Transform the client-join into a join
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local leave_iq = st.iq({ type = "set", from = jid.bare(stanza.attr.from), to = client_leave.attr.channel, id = stanza.attr.id });
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leave_iq:add_child(leave);
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add_state(stanza.attr.id, jid.resource(stanza.attr.from));
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module:send(leave_iq);
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return true;
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end
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module:hook("iq/bare", function(event)
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-- We handle the MIX results here since IQ stanzas against bare JIDs
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-- don't make a lot of sense. We first have to translate them into
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-- full JIDs based on our stanza ID -> resource mapping
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if event.stanza:get_child("leave", "urn:xmpp:mix:core:1") ~= nil then
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return handle_mix_leave(event);
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elseif event.stanza:get_child("join", "urn:xmpp:mix:core:1") ~= nil then
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return handle_mix_join(event);
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elseif has_state(event.stanza.attr.id) then
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local tmp = st.clone(event.stanza);
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tmp.attr.to = tmp.attr.to.."/"..pop_state(tmp.attr.id);
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module:send(tmp);
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return true;
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end
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end);
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function handle_mix_join(event)
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-- The MIX server responded
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-- TODO: Do stuff to the user's roster
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module:log("debug", "Received MIX-JOIN result");
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add_mix_host(jid.host(event.stanza.attr.from));
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mix_pam:set("hosts", mix_hosts);
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local stanza = event.stanza;
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local channel_jid = stanza:get_child("join", "urn:xmpp:mix:core:1").attr.id.."#"..stanza.attr.from;
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local resource = pop_state(stanza.attr.id);
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if resource == nil then
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module:log("error", "Got a MIX join result for a not-requested id %s. Maybe the MIX server changed the stanza ID?", stanza.attr.id);
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return false;
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end
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local client_join = st.iq({ type = "result", id = stanza.attr.id, from = jid.bare(stanza.attr.to), to = stanza.attr.to.."/"..resource })
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:tag("client-join", { xmlns = mix_pam_xmlns, jid = channel_jid });
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client_join:add_child(stanza:get_child("join", "urn:xmpp:mix:core:1"));
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module:send(client_join);
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return true;
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end
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function handle_mix_leave(event)
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-- The MIX server responded
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-- TODO: Do stuff to the user's roster
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module:log("debug", "Received MIX-LEAVE result");
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remove_mix_host(jid.host(event.stanza.attr.from));
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mix_pam:set("hosts", mix_hosts);
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local stanza = event.stanza;
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local resource = pop_state(stanza.attr.id);
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if resource == nil then
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module:log("error", "Got a MIX leave result for a not-requested id %s. Maybe the MIX server changed the stanza ID?", stanza.attr.id);
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return false;
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end
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local client_leave = st.iq({ type = "result", id = stanza.attr.id, from = jid.bare(stanza.attr.to), to = stanza.attr.to.."/"..resource })
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:tag("client-leave", { xmlns = mix_pam_xmlns });
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client_leave:add_child(stanza:get_child("leave", "urn:xmpp:mix:core:1"));
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module:send(client_leave);
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return true;
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end
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local user_resources = {}; -- [bare jid] -> array of bound resources
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module:hook("resource-bind", function(event)
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local jid, resource = jid.bare(event.session.full_jid), event.session.resource;
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if user_resources[jid] ~= nil then
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for _, r in pairs(user_resources) do
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if r == resource then return; end
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end
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table.insert(user_resources[jid], resource);
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else
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user_resources[jid] = { resource };
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end
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module:log("debug", "Caught resource %s of %s", resource, jid);
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end);
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module:hook("resource-unbind", function(event)
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local jid, resource = jid.bare(event.session.full_jid), event.session.resource;
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for i, r in pairs(user_resources[jid]) do
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if r == resource then
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table.remove(user_resources[jid], i);
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return;
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end
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end
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module:log("debug", "Unbind of not recorded resource %s (%s)", resource, jid);
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end);
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module:hook("message/bare", function(event)
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local stanza = event.stanza;
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local host = jid.host(stanza.attr.from);
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if not is_mix_host(host) then return; end
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if not is_mix_message(stanza) then return; end
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-- MIX-CORE says that if the message cannot be delivered, it should
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-- just be dropped
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if user_resources[stanza.attr.to] == nil then
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module:log("debug", "Skipping %s: No resource bound", stanza.attr.to);
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return true;
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end
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-- Per XEP we know that stanza.attr.to is the user's bare JID
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for _, resource in pairs(user_resources[stanza.attr.to]) do
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-- TODO: Only send to resources that advertise support for MIX (When MIX clients are available for testing)
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local msg = st.clone(stanza);
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msg.attr.to = stanza.attr.to.."/"..resource;
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module:send(msg);
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module:log("debug", "Sent message to %s", msg.attr.to);
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end
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return true;
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end);
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