prosody
f989608964ec
plugins/mod_pep.lua

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plugins/mod_pep.lua @ 1439:f989608964ec

mod_pep: Use cached caps
author Waqas Hussain <waqas20@gmail.com>
date Sun, 28 Jun 2009 21:49:31 +0500
parent 1437:cf2eba9b1716
child 1440:d3117a6ad1bf
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2 local jid_bare = require "util.jid".bare;
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3 local jid_split = require "util.jid".split;
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4 local st = require "util.stanza";
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5 local hosts = hosts;
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6 local user_exists = require "core.usermanager".user_exists;
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7 local is_contact_subscribed = require "core.rostermanager".is_contact_subscribed;
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8 local pairs, ipairs = pairs, ipairs;
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9 local next = next;
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10 local type = type;
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11 local load_roster = require "core.rostermanager".load_roster;
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12 local sha1 = require "util.hashes".sha1;
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13 local base64 = require "util.encodings".base64.encode;
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15 local NULL = {};
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16 local data = {};
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17 local recipients = {};
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18 local hash_map = {};
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19
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20 module:add_identity("pubsub", "pep");
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21 module:add_feature("http://jabber.org/protocol/pubsub#publish");
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22
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23 local function publish(session, node, item)
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24 local disable = #item.tags ~= 1 or #item.tags[1].tags == 0;
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25 local bare = session.username..'@'..session.host;
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26 local stanza = st.message({from=bare, type='headline'})
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27 :tag('event', {xmlns='http://jabber.org/protocol/pubsub#event'})
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28 :tag('items', {node=node})
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29 :add_child(item)
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30 :up()
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31 :up();
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32
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33 -- store for the future
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34 local user_data = data[bare];
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35 if disable then
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36 if user_data then user_data[node] = nil; end
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37 if not next(user_data) then data[bare] = nil; end
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38 else
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39 if not user_data then user_data = {}; data[bare] = user_data; end
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40 user_data[node] = stanza;
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41 end
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42
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43 -- broadcast
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44 for recipient, notify in pairs(recipients[bare] or NULL) do
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45 if notify[node] then
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46 stanza.attr.to = recipient;
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47 core_post_stanza(session, stanza);
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48 end
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49 end
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50 end
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51 local function publish_all(user, recipient, session)
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52 local d = data[user];
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53 local notify = recipients[user] and recipients[user][recipient];
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54 if d and notify then
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55 for node, message in pairs(notify) do
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56 if d[node] then
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57 message.attr.to = recipient;
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58 session.send(message);
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59 end
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60 end
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61 end
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62 end
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63
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64 local function get_caps_hash_from_presence(stanza, current)
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65 local t = stanza.attr.type;
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66 if not t then
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67 for _, child in pairs(stanza.tags) do
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68 if child.name == "c" and child.attr.xmlns == "http://jabber.org/protocol/caps" then
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69 local attr = child.attr;
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70 if attr.hash then -- new caps
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71 if attr.hash == 'sha-1' and attr.node and attr.ver then return attr.ver, attr.node.."#"..attr.ver; end
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72 else -- legacy caps
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73 if attr.node and attr.ver then return attr.node.."#"..attr.ver.."#"..(attr.ext or ""), attr.node.."#"..attr.ver; end
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74 end
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75 return; -- bad caps format
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76 end
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77 end
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78 elseif t == "unavailable" or t == "error" then
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79 return;
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80 end
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81 return current; -- no caps, could mean caps optimization, so return current
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82 end
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83
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84 module:hook("presence/bare", function(event)
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85 -- inbound presence to bare JID recieved
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86 local origin, stanza = event.origin, event.stanza;
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87
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88 local user = stanza.attr.to or (origin.username..'@'..origin.host);
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89 local bare = jid_bare(stanza.attr.from);
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90 local item = load_roster(jid_split(user))[bare];
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91 if not stanza.attr.to or (item and (item.subscription == 'from' or item.subscription == 'both')) then
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92 local recipient = stanza.attr.from;
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93 local current = recipients[user] and recipients[user][recipient];
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94 local hash = get_caps_hash_from_presence(stanza, current);
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95 if current == hash then return; end
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96 if not hash then
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97 if recipients[user] then recipients[user][recipient] = nil; end
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98 else
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99 recipients[user] = recipients[user] or {};
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100 if hash_map[hash] then
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101 recipients[user][recipient] = hash_map[hash];
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102 publish_all(user, recipient);
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103 else
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104 recipients[user][recipient] = hash;
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105 origin.send(
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106 st.stanza("iq", {from=stanza.attr.to, to=stanza.attr.from, id="disco", type="get"})
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107 :query("http://jabber.org/protocol/disco#info")
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108 );
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109 end
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110 end
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111 end
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112 end, 10);
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113
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114 module:hook("iq/bare/http://jabber.org/protocol/pubsub:pubsub", function(event)
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115 local session, stanza = event.origin, event.stanza;
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116 if stanza.attr.type == 'set' and (not stanza.attr.to or jid_bare(stanza.attr.from) == stanza.attr.to) then
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117 local payload = stanza.tags[1];
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118 if payload.name == 'pubsub' then -- <pubsub xmlns='http://jabber.org/protocol/pubsub'>
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119 payload = payload.tags[1];
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120 if payload and payload.name == 'publish' and payload.attr.node then -- <publish node='http://jabber.org/protocol/tune'>
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121 local node = payload.attr.node;
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122 payload = payload.tags[1];
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123 if payload then -- <item>
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124 publish(session, node, payload);
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125 return true;
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126 end
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127 end
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128 end
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129 end
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130 end);
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131
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132 local function calculate_hash(disco_info)
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133 local identities, features, extensions = {}, {}, {};
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134 for _, tag in pairs(disco_info) do
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135 if tag.name == "identity" then
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136 table.insert(identities, (tag.attr.category or "").."\0"..(tag.attr.type or "").."\0"..(tag.attr["xml:lang"] or "").."\0"..(tag.attr.name or ""));
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137 elseif tag.name == "feature" then
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138 table.insert(features, tag.attr.var or "");
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139 elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then
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140 local form = {};
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141 local FORM_TYPE;
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142 for _, field in pairs(tag.tags) do
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143 if field.name == "field" and field.attr.var then
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144 local values = {};
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145 for _, val in pairs(field.tags) do
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146 val = #val.tags == 0 and table.concat(val); -- FIXME use get_text?
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147 if val then table.insert(values, val); end
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148 end
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149 table.sort(values);
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150 if field.attr.var == "FORM_TYPE" then
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151 FORM_TYPE = values[1];
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152 elseif #values > 0 then
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153 table.insert(form, field.attr.var.."\0"..table.concat(values, "<"));
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154 else
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155 table.insert(form, field.attr.var);
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156 end
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157 end
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158 end
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159 table.sort(form);
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160 form = table.concat(form, "<");
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161 if FORM_TYPE then form = FORM_TYPE.."\0"..form; end
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162 table.insert(extensions, form);
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163 end
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164 end
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165 table.sort(identities);
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166 table.sort(features);
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167 table.sort(extensions);
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168 if #identities > 0 then identities = table.concat(identities, "<"):gsub("%z", "/").."<"; else identities = ""; end
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169 if #features > 0 then features = table.concat(features, "<").."<"; else features = ""; end
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170 if #extensions > 0 then extensions = table.concat(extensions, "<"):gsub("%z", "<").."<"; else extensions = ""; end
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171 local S = identities..features..extensions;
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172 local ver = base64(sha1(S));
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173 return ver, S;
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174 end
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175
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176 module:hook("iq/bare/disco", function(event)
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177 local session, stanza = event.origin, event.stanza;
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178 if stanza.attr.type == "result" then
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179 local disco = stanza.tags[1];
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180 if disco and disco.name == "query" and disco.attr.xmlns == "http://jabber.org/protocol/disco#info" then
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181 -- Process disco response
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182 local user = stanza.attr.to or (session.username..'@'..session.host);
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183 local contact = stanza.attr.from;
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184 local current = recipients[user] and recipients[user][contact];
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185 if type(current) ~= "string" then return; end -- check if waiting for recipient's response
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186 local ver = current;
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187 if not string.find(current, "#") then
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188 ver = calculate_hash(disco.tags); -- calculate hash
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189 end
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190 local notify = {};
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191 for _, feature in pairs(disco.tags) do
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192 if feature.name == "feature" and feature.attr.var then
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193 local nfeature = feature.attr.var:match("^(.*)+notify$");
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194 if nfeature then notify[nfeature] = true; end
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195 end
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196 end
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197 hash_map[ver] = notify; -- update hash map
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198 recipients[user][contact] = notify; -- set recipient's data to calculated data
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199 -- send messages to recipient
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200 publish_all(user, contact, session);
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201 end
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202 end
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203 end);