prosody-modules
6a9f91ad4f95
mod_service_directories/mod_service_directories.lua

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mod_service_directories/mod_service_directories.lua @ 1870:6a9f91ad4f95

mod_log_mark/README: Also mention logging
author Kim Alvefur <zash@zash.se>
date Thu, 24 Sep 2015 00:02:15 +0200
parent 1343:7dbde05b48a9
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1 -- Prosody IM
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2 -- Copyright (C) 2011 Waqas Hussain
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3 --
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4 -- This project is MIT/X11 licensed. Please see the
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5 -- COPYING file in the source package for more information.
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6 --
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8 -- An implementation of [XEP-0309: Service Directories]
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10 -- Imports and defines
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12 local st = require "util.stanza";
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13 local jid_split = require "util.jid".split;
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14 local adhoc_new = module:require "adhoc".new;
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15 local to_ascii = require "util.encodings".idna.to_ascii;
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16 local nameprep = require "util.encodings".stringprep.nameprep;
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17 local dataforms_new = require "util.dataforms".new;
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18 local pairs, ipairs = pairs, ipairs;
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19 local module = module;
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20 local hosts = hosts;
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22 local subscription_from = {};
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23 local subscription_to = {};
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24 local contact_features = {};
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25 local contact_vcards = {};
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27 -- Advertise in disco
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28
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29 module:add_identity("server", "directory", module:get_option_string("name", "Prosody"));
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30 module:add_feature("urn:xmpp:server-presence");
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32 -- Handle subscriptions
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34 module:hook("presence/host", function(event) -- inbound presence to the host
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35 local origin, stanza = event.origin, event.stanza;
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37 local node, host, resource = jid_split(stanza.attr.from);
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38 if stanza.attr.from ~= host then return; end -- not from a host
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40 local t = stanza.attr.type;
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41 if t == "probe" then
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42 module:send(st.presence({ from = module.host, to = host, id = stanza.attr.id }));
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43 elseif t == "subscribe" then
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44 subscription_from[host] = true;
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45 module:send(st.presence({ from = module.host, to = host, id = stanza.attr.id, type = "subscribed" }));
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46 module:send(st.presence({ from = module.host, to = host, id = stanza.attr.id }));
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47 add_contact(host);
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48 elseif t == "subscribed" then
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49 subscription_to[host] = true;
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50 query_host(host);
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51 elseif t == "unsubscribe" then
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52 subscription_from[host] = nil;
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53 module:send(st.presence({ from = module.host, to = host, id = stanza.attr.id, type = "unsubscribed" }));
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54 remove_contact(host);
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55 elseif t == "unsubscribed" then
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56 subscription_to[host] = nil;
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57 remove_contact(host);
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58 end
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59 return true;
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60 end, 10); -- priority over mod_presence
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61
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62 function remove_contact(host, id)
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63 contact_features[host] = nil;
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64 contact_vcards[host] = nil;
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65 if subscription_to[host] then
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66 subscription_to[host] = nil;
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67 module:send(st.presence({ from = module.host, to = host, id = id, type = "unsubscribe" }));
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68 end
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69 if subscription_from[host] then
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70 subscription_from[host] = nil;
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71 module:send(st.presence({ from = module.host, to = host, id = id, type = "unsubscribed" }));
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72 end
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73 end
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74 function add_contact(host, id)
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75 if not subscription_to[host] then
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76 module:send(st.presence({ from = module.host, to = host, id = id, type = "subscribe" }));
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77 end
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78 end
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79
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80 -- Admin ad-hoc command to subscribe
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81
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82 local function add_contact_handler(self, data, state)
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83 local layout = dataforms_new{
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84 title = "Adding a Server Buddy";
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85 instructions = "Fill out this form to add a \"server buddy\".";
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86
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87 { name = "FORM_TYPE", type = "hidden", value = "http://jabber.org/protocol/admin" };
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88 { name = "peerjid", type = "jid-single", required = true, label = "The server to add" };
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89 };
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90
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91 if not state then
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92 return { status = "executing", form = layout }, "executing";
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93 elseif data.action == "canceled" then
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94 return { status = "canceled" };
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95 else
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96 local fields = layout:data(data.form);
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97 local peerjid = nameprep(fields.peerjid);
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98 if not peerjid or peerjid == "" or #peerjid > 1023 or not to_ascii(peerjid) then
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99 return { status = "completed", error = { message = "Invalid JID" } };
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100 end
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101 add_contact(peerjid);
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102 return { status = "completed" };
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103 end
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104 end
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105
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106 local add_contact_command = adhoc_new("Adding a Server Buddy", "http://jabber.org/protocol/admin#server-buddy", add_contact_handler, "admin");
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107 module:add_item("adhoc", add_contact_command);
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108
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109 -- Disco query remote host
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110 function query_host(host)
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111 local stanza = st.iq({ from = module.host, to = host, type = "get", id = "mod_service_directories:disco" })
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112 :query("http://jabber.org/protocol/disco#info");
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113 module:send(stanza);
552
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114 end
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115
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116 -- Handle disco query result
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117 module:hook("iq-result/bare/mod_service_directories:disco", function(event)
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118 local origin, stanza = event.origin, event.stanza;
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119
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120 if not subscription_to[stanza.attr.from] then return; end -- not from a contact
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121 local host = stanza.attr.from;
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122
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123 local query = stanza:get_child("query", "http://jabber.org/protocol/disco#info")
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124 if not query then return; end
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125
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126 -- extract disco features
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127 local features = {};
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128 for _,tag in ipairs(query.tags) do
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129 if tag.name == "feature" and tag.attr.var then
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130 features[tag.attr.var] = true;
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131 end
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132 end
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133 contact_features[host] = features;
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134
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135 if features["urn:ietf:params:xml:ns:vcard-4.0"] then
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136 local stanza = st.iq({ from = module.host, to = host, type = "get", id = "mod_service_directories:vcard" })
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137 :tag("vcard", { xmlns = "urn:ietf:params:xml:ns:vcard-4.0" });
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138 module:send(stanza);
552
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139 end
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140 return true;
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141 end);
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142
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143 -- Handle vcard result
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144 module:hook("iq-result/bare/mod_service_directories:vcard", function(event)
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145 local origin, stanza = event.origin, event.stanza;
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146
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147 if not subscription_to[stanza.attr.from] then return; end -- not from a contact
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148 local host = stanza.attr.from;
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149
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150 local vcard = stanza:get_child("vcard", "urn:ietf:params:xml:ns:vcard-4.0");
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151 if not vcard then return; end
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152
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153 contact_vcards[host] = st.clone(vcard);
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154 return true;
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155 end);
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156
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157 -- PubSub
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158
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159 -- TODO the following should be replaced by mod_pubsub
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160
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161 module:hook("iq-get/host/http://jabber.org/protocol/pubsub:pubsub", function(event)
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162 local origin, stanza = event.origin, event.stanza;
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163 local payload = stanza.tags[1];
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164
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165 local items = payload:get_child("items", "http://jabber.org/protocol/pubsub");
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166 if items and items.attr.node == "urn:xmpp:contacts" then
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167 local reply = st.reply(stanza)
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168 :tag("pubsub", { xmlns = "http://jabber.org/protocol/pubsub" })
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169 :tag("items", { node = "urn:xmpp:contacts" });
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170 for host, vcard in pairs(contact_vcards) do
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171 reply:tag("item", { id = host })
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172 :add_child(vcard)
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173 :up();
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174 end
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175 origin.send(reply);
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176 return true;
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177 end
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178 end);
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179