plugins/mod_pep.lua

   1
   2 local jid_bare = require "util.jid".bare;
   3 local jid_split = require "util.jid".split;
   4 local st = require "util.stanza";
   5 local hosts = hosts;
   6 local user_exists = require "core.usermanager".user_exists;
   7 local is_contact_subscribed = require "core.rostermanager".is_contact_subscribed;
   8 local pairs, ipairs = pairs, ipairs;
   9 local next = next;
  10 local type = type;
  11 local load_roster = require "core.rostermanager".load_roster;
  12 local sha1 = require "util.hashes".sha1;
  13 local base64 = require "util.encodings".base64.encode;
  14
  15 local NULL = {};
  16 local data = {};
  17 local recipients = {};
  18 local hash_map = {};
  19
  20 module:add_identity("pubsub", "pep");
  21 module:add_feature("http://jabber.org/protocol/pubsub#publish");
  22
  23 local function publish(session, node, item)
  24         local disable = #item.tags ~= 1 or #item.tags[1].tags == 0;
  25         local bare = session.username..'@'..session.host;
  26         local stanza = st.message({from=bare, type='headline'})
  27                 :tag('event', {xmlns='http://jabber.org/protocol/pubsub#event'})
  28                         :tag('items', {node=node})
  29                                 :add_child(item)
  30                         :up()
  31                 :up();
  32
  33         -- store for the future
  34         local user_data = data[bare];
  35         if disable then
  36                 if user_data then
  37                         user_data[node] = nil;
  38                         if not next(user_data) then data[bare] = nil; end
  39                 end
  40         else
  41                 if not user_data then user_data = {}; data[bare] = user_data; end
  42                 user_data[node] = stanza;
  43         end
  44
  45         -- broadcast
  46         for recipient, notify in pairs(recipients[bare] or NULL) do
  47                 if notify[node] then
  48                         stanza.attr.to = recipient;
  49                         core_post_stanza(session, stanza);
  50                 end
  51         end
  52 end
  53 local function publish_all(user, recipient, session)
  54         local d = data[user];
  55         local notify = recipients[user] and recipients[user][recipient];
  56         if d and notify then
  57                 for node in pairs(notify) do
  58                         local message = d[node];
  59                         if message then
  60                                 message.attr.to = recipient;
  61                                 session.send(message);
  62                         end
  63                 end
  64         end
  65 end
  66
  67 local function get_caps_hash_from_presence(stanza, current)
  68         local t = stanza.attr.type;
  69         if not t then
  70                 for _, child in pairs(stanza.tags) do
  71                         if child.name == "c" and child.attr.xmlns == "http://jabber.org/protocol/caps" then
  72                                 local attr = child.attr;
  73                                 if attr.hash then -- new caps
  74                                         if attr.hash == 'sha-1' and attr.node and attr.ver then return attr.ver, attr.node.."#"..attr.ver; end
  75                                 else -- legacy caps
  76                                         if attr.node and attr.ver then return attr.node.."#"..attr.ver.."#"..(attr.ext or ""), attr.node.."#"..attr.ver; end
  77                                 end
  78                                 return; -- bad caps format
  79                         end
  80                 end
  81         elseif t == "unavailable" or t == "error" then
  82                 return;
  83         end
  84         return current; -- no caps, could mean caps optimization, so return current
  85 end
  86
  87 module:hook("presence/bare", function(event)
  88         -- inbound presence to bare JID recieved
  89         local origin, stanza = event.origin, event.stanza;
  90
  91         local user = stanza.attr.to or (origin.username..'@'..origin.host);
  92         local bare = jid_bare(stanza.attr.from);
  93         local item = load_roster(jid_split(user))[bare];
  94         if not stanza.attr.to or (item and (item.subscription == 'from' or item.subscription == 'both')) then
  95                 local recipient = stanza.attr.from;
  96                 local current = recipients[user] and recipients[user][recipient];
  97                 local hash = get_caps_hash_from_presence(stanza, current);
  98                 if current == hash then return; end
  99                 if not hash then
 100                         if recipients[user] then recipients[user][recipient] = nil; end
 101                 else
 102                         recipients[user] = recipients[user] or {};
 103                         if hash_map[hash] then
 104                                 recipients[user][recipient] = hash_map[hash];
 105                                 publish_all(user, recipient, origin);
 106                         else
 107                                 recipients[user][recipient] = hash;
 108                                 origin.send(
 109                                         st.stanza("iq", {from=stanza.attr.to, to=stanza.attr.from, id="disco", type="get"})
 110                                                 :query("http://jabber.org/protocol/disco#info")
 111                                 );
 112                         end
 113                 end
 114         end
 115 end, 10);
 116
 117 module:hook("iq/bare/http://jabber.org/protocol/pubsub:pubsub", function(event)
 118         local session, stanza = event.origin, event.stanza;
 119         if stanza.attr.type == 'set' and (not stanza.attr.to or jid_bare(stanza.attr.from) == stanza.attr.to) then
 120                 local payload = stanza.tags[1];
 121                 if payload.name == 'pubsub' then -- <pubsub xmlns='http://jabber.org/protocol/pubsub'>
 122                         payload = payload.tags[1];
 123                         if payload and payload.name == 'publish' and payload.attr.node then -- <publish node='http://jabber.org/protocol/tune'>
 124                                 local node = payload.attr.node;
 125                                 payload = payload.tags[1];
 126                                 if payload then -- <item>
 127                                         publish(session, node, payload);
 128                                         return true;
 129                                 end
 130                         end
 131                 end
 132         end
 133 end);
 134
 135 local function calculate_hash(disco_info)
 136         local identities, features, extensions = {}, {}, {};
 137         for _, tag in pairs(disco_info) do
 138                 if tag.name == "identity" then
 139                         table.insert(identities, (tag.attr.category or "").."\0"..(tag.attr.type or "").."\0"..(tag.attr["xml:lang"] or "").."\0"..(tag.attr.name or ""));
 140                 elseif tag.name == "feature" then
 141                         table.insert(features, tag.attr.var or "");
 142                 elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then
 143                         local form = {};
 144                         local FORM_TYPE;
 145                         for _, field in pairs(tag.tags) do
 146                                 if field.name == "field" and field.attr.var then
 147                                         local values = {};
 148                                         for _, val in pairs(field.tags) do
 149                                                 val = #val.tags == 0 and table.concat(val); -- FIXME use get_text?
 150                                                 if val then table.insert(values, val); end
 151                                         end
 152                                         table.sort(values);
 153                                         if field.attr.var == "FORM_TYPE" then
 154                                                 FORM_TYPE = values[1];
 155                                         elseif #values > 0 then
 156                                                 table.insert(form, field.attr.var.."\0"..table.concat(values, "<"));
 157                                         else
 158                                                 table.insert(form, field.attr.var);
 159                                         end
 160                                 end
 161                         end
 162                         table.sort(form);
 163                         form = table.concat(form, "<");
 164                         if FORM_TYPE then form = FORM_TYPE.."\0"..form; end
 165                         table.insert(extensions, form);
 166                 end
 167         end
 168         table.sort(identities);
 169         table.sort(features);
 170         table.sort(extensions);
 171         if #identities > 0 then identities = table.concat(identities, "<"):gsub("%z", "/").."<"; else identities = ""; end
 172         if #features > 0 then features = table.concat(features, "<").."<"; else features = ""; end
 173         if #extensions > 0 then extensions = table.concat(extensions, "<"):gsub("%z", "<").."<"; else extensions = ""; end
 174         local S = identities..features..extensions;
 175         local ver = base64(sha1(S));
 176         return ver, S;
 177 end
 178
 179 module:hook("iq/bare/disco", function(event)
 180         local session, stanza = event.origin, event.stanza;
 181         if stanza.attr.type == "result" then
 182                 local disco = stanza.tags[1];
 183                 if disco and disco.name == "query" and disco.attr.xmlns == "http://jabber.org/protocol/disco#info" then
 184                         -- Process disco response
 185                         local user = stanza.attr.to or (session.username..'@'..session.host);
 186                         local contact = stanza.attr.from;
 187                         local current = recipients[user] and recipients[user][contact];
 188                         if type(current) ~= "string" then return; end -- check if waiting for recipient's response
 189                         local ver = current;
 190                         if not string.find(current, "#") then
 191                                 ver = calculate_hash(disco.tags); -- calculate hash
 192                         end
 193                         local notify = {};
 194                         for _, feature in pairs(disco.tags) do
 195                                 if feature.name == "feature" and feature.attr.var then
 196                                         local nfeature = feature.attr.var:match("^(.*)%+notify$");
 197                                         if nfeature then notify[nfeature] = true; end
 198                                 end
 199                         end
 200                         hash_map[ver] = notify; -- update hash map
 201                         recipients[user][contact] = notify; -- set recipient's data to calculated data
 202                         -- send messages to recipient
 203                         publish_all(user, contact, session);
 204                 end
 205         end
 206 end);