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annotate mod_delegation/mod_delegation.lua @ 1712:c1973605d096

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mod_delegation: disco nesting for host
author Goffi <goffi@goffi.org>
date Fri, 17 Apr 2015 21:06:30 +0200
parents 55b9ac807ac9
children 01e9465f8f80
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- XEP-0355 (Namespace Delegation)
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2 -- Copyright (C) 2015 Jérôme Poisson
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3 --
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4 -- This module 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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7 -- This module manage namespace delegation, a way to delegate server features
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8 -- to an external entity/component. Only the admin mode is implemented so far
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9
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10 -- TODO: client mode, managing entity error handling
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11
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12 local jid = require("util/jid")
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13 local st = require("util/stanza")
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14 local set = require("util/set")
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15
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16 local delegation_session = module:shared("/*/delegation/session")
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17
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18 if delegation_session.connected_cb == nil then
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19 -- set used to have connected event listeners
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20 -- which allow a host to react on events from
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21 -- other hosts
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22 delegation_session.connected_cb = set.new()
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23 end
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24 local connected_cb = delegation_session.connected_cb
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25
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26 local _DELEGATION_NS = 'urn:xmpp:delegation:1'
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27 local _FORWARDED_NS = 'urn:xmpp:forward:0'
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28 local _DISCO_NS = 'http://jabber.org/protocol/disco#info'
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29 local _ORI_ID_PREFIX = "IQ_RESULT_"
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30
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31 local _MAIN_SEP = '::'
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32 --local _BARE_SEP = ':bare:'
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33
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34 local disco_nest
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35
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36 module:log("debug", "Loading namespace delegation module ");
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37
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38
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39 --> Configuration management <--
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40
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41 local ns_delegations = module:get_option("delegations", {})
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42
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43 local jid2ns = {}
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44 for namespace, ns_data in pairs(ns_delegations) do
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45 -- "connected" contain the full jid of connected managing entity
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46 ns_data.connected = nil
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47 if ns_data.jid then
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48 if jid2ns[ns_data.jid] == nil then
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49 jid2ns[ns_data.jid] = {}
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50 end
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51 jid2ns[ns_data.jid][namespace] = ns_data
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52 module:log("debug", "Namespace %s is delegated%s to %s", namespace, ns_data.filtering and " (with filtering)" or "", ns_data.jid)
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53 else
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54 module:log("warn", "Ignoring delegation for %s: no jid specified", tostring(namespace))
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55 ns_delegations[namespace] = nil
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56 end
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57 end
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58
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59
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60 local function advertise_delegations(session, to_jid)
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61 -- send <message/> stanza to advertise delegations
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62 -- as expained in § 4.2
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63 local message = st.message({from=module.host, to=to_jid})
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64 :tag("delegation", {xmlns=_DELEGATION_NS})
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65
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66 -- we need to check if a delegation is granted because the configuration
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67 -- can be complicated if some delegations are granted to bare jid
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68 -- and other to full jids, and several resources are connected.
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69 local have_delegation = false
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70
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71 for namespace, ns_data in pairs(jid2ns[to_jid]) do
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72 if ns_data.connected == to_jid then
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73 have_delegation = true
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74 message:tag("delegated", {namespace=namespace})
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75 if type(ns_data.filtering) == "table" then
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76 for _, attribute in pairs(ns_data.filtering) do
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77 message:tag("attribute", {name=attribute}):up()
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78 end
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79 message:up()
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80 end
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81 end
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82 end
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83
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84 if have_delegation then
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85 session.send(message)
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86 end
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87 end
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88
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89 local function set_connected(entity_jid)
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90 -- set the "connected" key for all namespace managed by entity_jid
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91 -- if the namespace has already a connected entity, ignore the new one
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92 local function set_config(jid_)
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93 for namespace, ns_data in pairs(jid2ns[jid_]) do
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94 if ns_data.connected == nil then
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95 ns_data.connected = entity_jid
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96 disco_nest(namespace, entity_jid)
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97 end
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98 end
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99 end
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100 local bare_jid = jid.bare(entity_jid)
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101 set_config(bare_jid)
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102 -- We can have a bare jid of a full jid specified in configuration
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103 -- so we try our luck with both (first connected resource will
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104 -- manage the namespaces in case of bare jid)
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105 if bare_jid ~= entity_jid then
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106 set_config(entity_jid)
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107 jid2ns[entity_jid] = jid2ns[bare_jid]
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108 end
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109 end
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110
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111 local function on_presence(event)
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112 local session = event.origin
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113 local bare_jid = jid.bare(session.full_jid)
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114
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115 if jid2ns[bare_jid] or jid2ns[session.full_jid] then
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116 set_connected(session.full_jid)
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117 advertise_delegations(session, session.full_jid)
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118 end
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119 end
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120
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121 local function on_component_connected(event)
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122 -- method called by the module loaded by the component
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123 -- /!\ the event come from the component host,
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124 -- not from the host of this module
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125 local session = event.session
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126 local bare_jid = jid.join(session.username, session.host)
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127
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128 local jid_delegations = jid2ns[bare_jid]
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129 if jid_delegations ~= nil then
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130 set_connected(bare_jid)
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131 advertise_delegations(session, bare_jid)
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132 end
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133 end
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134
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135 local function on_component_auth(event)
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136 -- react to component-authenticated event from this host
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137 -- and call the on_connected methods from all other hosts
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138 -- needed for the component to get delegations advertising
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139 for callback in connected_cb:items() do
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140 callback(event)
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141 end
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142 end
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diff changeset
143
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144 connected_cb:add(on_component_connected)
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145 module:hook('component-authenticated', on_component_auth)
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146 module:hook('presence/initial', on_presence)
1710
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147
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148
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149 --> delegated namespaces hook <--
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150
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151 local function managing_ent_result(event)
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152 -- this function manage iq results from the managing entity
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153 -- it do a couple of security check before sending the
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154 -- result to the managed entity
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155 local session, stanza = event.origin, event.stanza
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156 if stanza.attr.to ~= module.host then
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157 module:log("warn", 'forwarded stanza result has "to" attribute not addressed to current host, id conflict ?')
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158 return
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159 end
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160 module:unhook("iq-result/host/"..stanza.attr.id, managing_ent_result)
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161
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162 -- lot of checks to do...
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163 local delegation = stanza.tags[1]
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164 if #stanza ~= 1 or delegation.name ~= "delegation" or
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165 delegation.attr.xmlns ~= _DELEGATION_NS then
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166 session.send(st.error_reply(stanza, 'modify', 'not-acceptable'))
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167 return true
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168 end
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169
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170 local forwarded = delegation.tags[1]
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171 if #delegation ~= 1 or forwarded.name ~= "forwarded" or
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Goffi <goffi@goffi.org>
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diff changeset
172 forwarded.attr.xmlns ~= _FORWARDED_NS then
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diff changeset
173 session.send(st.error_reply(stanza, 'modify', 'not-acceptable'))
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174 return true
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175 end
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176
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177 local iq = forwarded.tags[1]
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178 if #forwarded ~= 1 or iq.name ~= "iq" or #iq ~= 1 then
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179 session.send(st.error_reply(stanza, 'modify', 'not-acceptable'))
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180 return true
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181 end
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182
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183 local namespace = iq.tags[1].xmlns
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184 local ns_data = ns_delegations[namespace]
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Goffi <goffi@goffi.org>
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185 local original = ns_data[_ORI_ID_PREFIX..stanza.attr.id]
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186
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diff changeset
187 if stanza.attr.from ~= ns_data.connected or iq.attr.type ~= "result" or
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188 iq.attr.id ~= original.attr.id or iq.attr.to ~= original.attr.from then
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189 session.send(st.error_reply(stanza, 'auth', 'forbidden'))
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190 module:send(st.error_reply(original, 'cancel', 'service-unavailable'))
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191 return true
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192 end
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diff changeset
193
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194 -- at this point eveything is checked,
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Goffi <goffi@goffi.org>
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195 -- and we (hopefully) can send the the result safely
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Goffi <goffi@goffi.org>
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196 module:send(iq)
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197 end
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diff changeset
198
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Goffi <goffi@goffi.org>
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199 local function forward_iq(stanza, ns_data)
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Goffi <goffi@goffi.org>
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200 local to_jid = ns_data.connected
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Goffi <goffi@goffi.org>
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201 local iq_stanza = st.iq({ from=module.host, to=to_jid, type="set" })
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diff changeset
202 :tag("delegation", { xmlns=_DELEGATION_NS })
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diff changeset
203 :tag("forwarded", { xmlns=_FORWARDED_NS })
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Goffi <goffi@goffi.org>
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diff changeset
204 :add_child(stanza)
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Goffi <goffi@goffi.org>
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diff changeset
205 local iq_id = iq_stanza.attr.id
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Goffi <goffi@goffi.org>
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diff changeset
206 -- we save the original stanza to check the managing entity result
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
207 ns_data[_ORI_ID_PREFIX..iq_id] = stanza
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
208 module:hook("iq-result/host/"..iq_id, managing_ent_result)
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
209 module:send(iq_stanza)
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
210 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
211
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
212 local function iq_hook(event)
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
213 -- general hook for all the iq which forward delegated ones
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
214 -- and continue normal behaviour else. If a namespace is
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
215 -- delegated but managing entity is offline, a service-unavailable
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
216 -- error will be sent, as requested by the XEP
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
217 local session, stanza = event.origin, event.stanza
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
218 if #stanza == 1 and stanza.attr.type == 'get' or stanza.attr.type == 'set' then
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
219 local namespace = stanza.tags[1].attr.xmlns
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
220 local ns_data = ns_delegations[namespace]
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
221
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
222 if ns_data then
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
223 if ns_data.filtering then
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
224 local first_child = stanza.tags[1]
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
225 for _, attribute in ns_data.filtering do
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
226 -- if any filtered attribute if not present,
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
227 -- we must continue the normal bahaviour
b68eed25b880 mod_delegation: iq forwarding to managing entity
Goffi <goffi@goffi.org>
parents: 1709
diff changeset
228 if not first_child.attr[attribute] then
1711
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
229 -- Filtered attribute is not present, we do normal workflow
1710
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
230 return;
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
231 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
232 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
233 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
234 if not ns_data.connected then
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
235 module:log("warn", "No connected entity to manage "..namespace)
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
236 session.send(st.error_reply(stanza, 'cancel', 'service-unavailable'))
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
237 else
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
238 forward_iq(stanza, ns_data)
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
239 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
240 return true
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
241 else
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
242 -- we have no delegation, we continue normal behaviour
b68eed25b880 mod_delegation: iq forwarding to managing entity
Goffi <goffi@goffi.org>
parents: 1709
diff changeset
243 return
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
244 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
245 end
b68eed25b880 mod_delegation: iq forwarding to managing entity
Goffi <goffi@goffi.org>
parents: 1709
diff changeset
246 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
247
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
248 module:hook("iq/self", iq_hook, 2^32)
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
249 module:hook("iq/host", iq_hook, 2^32)
1711
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
250
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
251
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
252 --> discovery nesting <--
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
253
1712
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
254 -- disabling internal features/identities
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
255
1711
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
256 -- modules whose features/identities are managed by delegation
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257 local disabled_modules = set.new()
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258
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Goffi <goffi@goffi.org>
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259 local function identity_added(event)
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260 local source = event.source
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Goffi <goffi@goffi.org>
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261 if disabled_modules:contains(source) then
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Goffi <goffi@goffi.org>
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262 local item = event.item
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Goffi <goffi@goffi.org>
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263 local category, type_, name = item.category, item.type, item.name
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Goffi <goffi@goffi.org>
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264 module:log("debug", "Removing (%s/%s%s) identity because of delegation", category, type_, name and "/"..name or "")
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Goffi <goffi@goffi.org>
parents: 1710
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265 source:remove_item("identity", item)
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266 end
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267
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268 end
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269
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Goffi <goffi@goffi.org>
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270 local function feature_added(event)
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271 local source, item = event.source, event.item
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272 for namespace, _ in pairs(ns_delegations) do
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273 if source ~= module and string.sub(item, 1, #namespace) == namespace then
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Goffi <goffi@goffi.org>
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274 module:log("debug", "Removing %s feature which is delegated", item)
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275 source:remove_item("feature", item)
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276 disabled_modules:add(source)
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277 if source.items and source.items.identity then
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278 -- we remove all identities added by the source module
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279 -- that can cause issues if the module manages several features/identities
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280 -- but this case is probably rare (or doesn't happen at all)
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281 -- FIXME: any better way ?
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282 for _, identity in pairs(source.items.identity) do
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283 identity_added({source=source, item=identity})
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284 end
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285 end
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286 end
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287 end
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288 end
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289
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290 -- for disco nesting (see § 7.2) we need to remove internal features
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Goffi <goffi@goffi.org>
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291 -- we use handle_items as it allow to remove already added features
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Goffi <goffi@goffi.org>
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292 -- and catch the ones which can come later
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Goffi <goffi@goffi.org>
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diff changeset
293 module:handle_items("feature", feature_added, function(_) end)
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Goffi <goffi@goffi.org>
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294 module:handle_items("identity", identity_added, function(_) end, false)
1712
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295
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296
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Goffi <goffi@goffi.org>
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297 -- managing entity features/identities collection
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Goffi <goffi@goffi.org>
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298
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Goffi <goffi@goffi.org>
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299 local disco_main_error
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Goffi <goffi@goffi.org>
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300
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Goffi <goffi@goffi.org>
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diff changeset
301 local function disco_main_result(event)
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Goffi <goffi@goffi.org>
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diff changeset
302 local session, stanza = event.origin, event.stanza
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Goffi <goffi@goffi.org>
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diff changeset
303 if stanza.attr.to ~= module.host then
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
304 module:log("warn", 'Stanza result has "to" attribute not addressed to current host, id conflict ?')
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Goffi <goffi@goffi.org>
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diff changeset
305 return
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Goffi <goffi@goffi.org>
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diff changeset
306 end
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Goffi <goffi@goffi.org>
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diff changeset
307 module:unhook("iq-result/host/"..stanza.attr.id, disco_main_result)
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
308 module:unhook("iq-error/host/"..stanza.attr.id, disco_main_error)
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
309 local query = stanza:get_child("query", _DISCO_NS)
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Goffi <goffi@goffi.org>
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diff changeset
310 if not query or not query.attr.node then
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
311 session.send(st.error_reply(stanza, 'modify', 'not-acceptable'))
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
312 return true
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diff changeset
313 end
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Goffi <goffi@goffi.org>
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diff changeset
314 -- local node = query.attr.node
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
315 for feature in query:childtags("feature") do
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Goffi <goffi@goffi.org>
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diff changeset
316 local namespace = feature.attr.var
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
317 if not module:has_feature(namespace) then -- we avoid doubling features in case of disconnection/reconnexion
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
318 module:add_feature(namespace)
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Goffi <goffi@goffi.org>
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319 end
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Goffi <goffi@goffi.org>
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diff changeset
320 end
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
321 for identity in query:childtags("identity") do
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
322 local category, type_, name = identity.attr.category, identity.attr.type, identity.attr.name
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
323 if not module:has_identity(category, type_, name) then
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
324 module:add_identity(category, type_, name)
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Goffi <goffi@goffi.org>
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diff changeset
325 end
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Goffi <goffi@goffi.org>
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diff changeset
326 end
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
327 end
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
328
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
329 function disco_main_error(event)
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
330 local stanza = event.stanza
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
331 if stanza.attr.to ~= module.host then
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
332 module:log("warn", 'Stanza result has "to" attribute not addressed to current host, id conflict ?')
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
333 return
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Goffi <goffi@goffi.org>
parents: 1711
diff changeset
334 end
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
335 module:unhook("iq-result/host/"..stanza.attr.id, disco_main_result)
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
336 module:unhook("iq-error/host/"..stanza.attr.id, disco_main_error)
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
337 module:log("warn", "Got an error while requesting disco for nesting to "..stanza.attr.from)
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
338 module:log("warn", "Ignoring disco nesting")
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
339 end
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
340
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
341 function disco_nest(namespace, entity_jid)
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
342 local main_node = _DELEGATION_NS.._MAIN_SEP..namespace
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
343 -- local bare_node = _DELEGATION_NS.._BARE_SEP..namespace
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
344
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
345 local iq = st.iq({from=module.host, to=entity_jid, type='get'})
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
346 :tag('query', {xmlns=_DISCO_NS, node=main_node})
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
347
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
348 local iq_id = iq.attr.id
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
349
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
350 module:hook("iq-result/host/"..iq_id, disco_main_result)
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
351 module:hook("iq-error/host/"..iq_id, disco_main_error)
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
352 module:send(iq)
c1973605d096 mod_delegation: disco nesting for host
Goffi <goffi@goffi.org>
parents: 1711
diff changeset
353 end