plugins/mod_pubsub.lua

   1 local pubsub = require "util.pubsub";
   2 local st = require "util.stanza";
   3 local jid_bare = require "util.jid".bare;
   4 local uuid_generate = require "util.uuid".generate;
   5
   6 require "core.modulemanager".load(module.host, "iq");
   7
   8 local xmlns_pubsub = "http://jabber.org/protocol/pubsub";
   9 local xmlns_pubsub_errors = "http://jabber.org/protocol/pubsub#errors";
  10 local xmlns_pubsub_event = "http://jabber.org/protocol/pubsub#event";
  11
  12 local autocreate_on_publish = module:get_option_boolean("autocreate_on_publish", false);
  13 local autocreate_on_subscribe = module:get_option_boolean("autocreate_on_subscribe", false);
  14
  15 local service;
  16
  17 local handlers = {};
  18
  19 function handle_pubsub_iq(event)
  20         local origin, stanza = event.origin, event.stanza;
  21         local pubsub = stanza.tags[1];
  22         local action = pubsub.tags[1];
  23         local handler = handlers[stanza.attr.type.."_"..action.name];
  24         if handler then
  25                 handler(origin, stanza, action);
  26                 return true;
  27         end
  28 end
  29
  30 local pubsub_errors = {
  31         ["conflict"] = { "cancel", "conflict" };
  32         ["invalid-jid"] = { "modify", "bad-request", nil, "invalid-jid" };
  33         ["item-not-found"] = { "cancel", "item-not-found" };
  34         ["not-subscribed"] = { "modify", "unexpected-request", nil, "not-subscribed" };
  35         ["forbidden"] = { "cancel", "forbidden" };
  36 };
  37 function pubsub_error_reply(stanza, error)
  38         local e = pubsub_errors[error];
  39         local reply = st.error_reply(stanza, unpack(e, 1, 3));
  40         if e[4] then
  41                 reply:tag(e[4], { xmlns = xmlns_pubsub_errors }):up();
  42         end
  43         return reply;
  44 end
  45
  46 function handlers.get_items(origin, stanza, items)
  47         local node = items.attr.node;
  48         local item = items:get_child("item");
  49         local id = item and item.attr.id;
  50
  51         local ok, results = service:get_items(node, stanza.attr.from, id);
  52         if not ok then
  53                 return origin.send(pubsub_error_reply(stanza, results));
  54         end
  55
  56         local data = st.stanza("items", { node = node });
  57         for _, entry in pairs(results) do
  58                 data:add_child(entry);
  59         end
  60         if data then
  61                 reply = st.reply(stanza)
  62                         :tag("pubsub", { xmlns = xmlns_pubsub })
  63                                 :add_child(data);
  64         else
  65                 reply = pubsub_error_reply(stanza, "item-not-found");
  66         end
  67         return origin.send(reply);
  68 end
  69
  70 function handlers.set_create(origin, stanza, create)
  71         local node = create.attr.node;
  72         local ok, ret, reply;
  73         if node then
  74                 ok, ret = service:create(node, stanza.attr.from);
  75                 if ok then
  76                         reply = st.reply(stanza);
  77                 else
  78                         reply = pubsub_error_reply(stanza, ret);
  79                 end
  80         else
  81                 repeat
  82                         node = uuid_generate();
  83                         ok, ret = service:create(node, stanza.attr.from);
  84                 until ok or ret ~= "conflict";
  85                 if ok then
  86                         reply = st.reply(stanza)
  87                                 :tag("pubsub", { xmlns = xmlns_pubsub })
  88                                         :tag("create", { node = node });
  89                 else
  90                         reply = pubsub_error_reply(stanza, ret);
  91                 end
  92         end
  93         return origin.send(reply);
  94 end
  95
  96 function handlers.set_subscribe(origin, stanza, subscribe)
  97         local node, jid = subscribe.attr.node, subscribe.attr.jid;
  98         if jid_bare(jid) ~= jid_bare(stanza.attr.from) then
  99                 return origin.send(pubsub_error_reply(stanza, "invalid-jid"));
 100         end
 101         local ok, ret = service:add_subscription(node, stanza.attr.from, jid);
 102         local reply;
 103         if ok then
 104                 reply = st.reply(stanza)
 105                         :tag("pubsub", { xmlns = xmlns_pubsub })
 106                                 :tag("subscription", {
 107                                         node = node,
 108                                         jid = jid,
 109                                         subscription = "subscribed"
 110                                 });
 111         else
 112                 reply = pubsub_error_reply(stanza, ret);
 113         end
 114         return origin.send(reply);
 115 end
 116
 117 function handlers.set_unsubscribe(origin, stanza, unsubscribe)
 118         local node, jid = unsubscribe.attr.node, unsubscribe.attr.jid;
 119         if jid_bare(jid) ~= jid_bare(stanza.attr.from) then
 120                 return origin.send(pubsub_error_reply(stanza, "invalid-jid"));
 121         end
 122         local ok, ret = service:remove_subscription(node, stanza.attr.from, jid);
 123         local reply;
 124         if ok then
 125                 reply = st.reply(stanza);
 126         else
 127                 reply = pubsub_error_reply(stanza, ret);
 128         end
 129         return origin.send(reply);
 130 end
 131
 132 function handlers.set_publish(origin, stanza, publish)
 133         local node = publish.attr.node;
 134         local item = publish:get_child("item");
 135         local id = (item and item.attr.id) or uuid_generate();
 136         local ok, ret = service:publish(node, stanza.attr.from, id, item);
 137         local reply;
 138         if ok then
 139                 reply = st.reply(stanza)
 140                         :tag("pubsub", { xmlns = xmlns_pubsub })
 141                                 :tag("publish", { node = node })
 142                                         :tag("item", { id = id });
 143         else
 144                 reply = pubsub_error_reply(stanza, ret);
 145         end
 146         return origin.send(reply);
 147 end
 148
 149 function handlers.set_retract(origin, stanza, retract)
 150         local node, notify = retract.attr.node, retract.attr.notify;
 151         notify = (notify == "1") or (notify == "true");
 152         local item = retract:get_child("item");
 153         local id = item and item.attr.id
 154         local reply, notifier;
 155         if notify then
 156                 notifier = st.stanza("retract", { id = id });
 157         end
 158         local ok, ret = service:retract(node, stanza.attr.from, id, notifier);
 159         if ok then
 160                 reply = st.reply(stanza);
 161         else
 162                 reply = pubsub_error_reply(stanza, ret);
 163         end
 164         return origin.send(reply);
 165 end
 166
 167 function simple_broadcast(node, jids, item)
 168         item = st.clone(item);
 169         item.attr.xmlns = nil; -- Clear the pubsub namespace
 170         local message = st.message({ from = module.host, type = "headline" })
 171                 :tag("event", { xmlns = xmlns_pubsub_event })
 172                         :tag("items", { node = node })
 173                                 :add_child(item);
 174         for jid in pairs(jids) do
 175                 module:log("debug", "Sending notification to %s", jid);
 176                 message.attr.to = jid;
 177                 core_post_stanza(hosts[module.host], message);
 178         end
 179 end
 180
 181 module:hook("iq/host/http://jabber.org/protocol/pubsub:pubsub", handle_pubsub_iq);
 182
 183 local disco_info;
 184
 185 local feature_map = {
 186         create = { "create-nodes", autocreate_on_publish and "instant-nodes", "item-ids" };
 187         retract = { "delete-items", "retract-items" };
 188         publish = { "publish" };
 189         get_items = { "retrieve-items" };
 190 };
 191
 192 local function add_disco_features_from_service(disco, service)
 193         for method, features in pairs(feature_map) do
 194                 if service[method] then
 195                         for _, feature in ipairs(features) do
 196                                 if feature then
 197                                         disco:tag("feature", { var = xmlns_pubsub.."#"..feature }):up();
 198                                 end
 199                         end
 200                 end
 201         end
 202         for affiliation in pairs(service.config.capabilities) do
 203                 if affiliation ~= "none" and affiliation ~= "owner" then
 204                         disco:tag("feature", { var = xmlns_pubsub.."#"..affiliation.."-affiliation" }):up();
 205                 end
 206         end
 207 end
 208
 209 local function build_disco_info(service)
 210         local disco_info = st.stanza("query", { xmlns = "http://jabber.org/protocol/disco#info" })
 211                 :tag("identity", { category = "pubsub", type = "service" }):up()
 212                 :tag("feature", { var = "http://jabber.org/protocol/pubsub" }):up();
 213         add_disco_features_from_service(disco_info, service);
 214         return disco_info;
 215 end
 216
 217 module:hook("iq-get/host/http://jabber.org/protocol/disco#info:query", function (event)
 218         event.origin.send(st.reply(event.stanza):add_child(disco_info));
 219         return true;
 220 end);
 221
 222 module:hook("iq-get/host/http://jabber.org/protocol/disco#items:query", function (event)
 223         local ok, ret = service:get_nodes(event.stanza.attr.from);
 224         if not ok then
 225                 event.origin.send(pubsub_error_reply(stanza, ret));
 226         else
 227                 local reply = st.reply(event.stanza)
 228                         :tag("query", { xmlns = "http://jabber.org/protocol/disco#items" });
 229                 for node, node_obj in pairs(ret) do
 230                         reply:tag("item", { jid = module.host, node = node, name = node_obj.config.name }):up();
 231                 end
 232                 event.origin.send(reply);
 233         end
 234         return true;
 235 end);
 236
 237 local admin_aff = module:get_option_string("default_admin_affiliation", "owner");
 238 local function get_affiliation(jid)
 239         local bare_jid = jid_bare(jid);
 240         if bare_jid == module.host or usermanager.is_admin(bare_jid, module.host) then
 241                 return admin_aff;
 242         end
 243 end
 244
 245 function set_service(new_service)
 246         service = new_service;
 247         module.environment.service = service;
 248         disco_info = build_disco_info(service);
 249 end
 250
 251 function module.save()
 252         return { service = service };
 253 end
 254
 255 function module.restore(data)
 256         set_service(data.service);
 257 end
 258
 259 set_service(pubsub.new({
 260         capabilities = {
 261                 none = {
 262                         create = false;
 263                         publish = false;
 264                         retract = false;
 265                         get_nodes = true;
 266
 267                         subscribe = true;
 268                         unsubscribe = true;
 269                         get_subscription = true;
 270                         get_items = true;
 271
 272                         subscribe_other = false;
 273                         unsubscribe_other = false;
 274                         get_subscription_other = false;
 275
 276                         be_subscribed = true;
 277                         be_unsubscribed = true;
 278
 279                         set_affiliation = false;
 280                 };
 281                 owner = {
 282                         create = true;
 283                         publish = true;
 284                         retract = true;
 285                         get_nodes = true;
 286
 287                         subscribe = true;
 288                         unsubscribe = true;
 289                         get_subscription = true;
 290                         get_items = true;
 291
 292
 293                         subscribe_other = true;
 294                         unsubscribe_other = true;
 295                         get_subscription_other = true;
 296
 297                         be_subscribed = true;
 298                         be_unsubscribed = true;
 299
 300                         set_affiliation = true;
 301                 };
 302         };
 303
 304         autocreate_on_publish = autocreate_on_publish;
 305         autocreate_on_subscribe = autocreate_on_subscribe;
 306
 307         broadcaster = simple_broadcast;
 308         get_affiliation = get_affiliation;
 309         jids_equal = function (jid1, jid2)
 310                 return jid_bare(jid1) == jid_bare(jid2);
 311         end;
 312 }));