author | Goffi <goffi@goffi.org> |
Fri, 17 Apr 2015 21:22:35 +0200 | |
changeset 1719 | 241c061bb953 |
parent 1718 | 3d83f5337a73 |
child 1720 | 29dfdfc767b4 |
permissions | -rw-r--r-- |
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-- XEP-0355 (Namespace Delegation) |
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-- Copyright (C) 2015 Jérôme Poisson |
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-- |
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-- This module is MIT/X11 licensed. Please see the |
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-- COPYING file in the source package for more information. |
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-- This module manage namespace delegation, a way to delegate server features |
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-- to an external entity/component. Only the admin mode is implemented so far |
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-- TODO: client mode, managing entity error handling, disco extensions (XEP-0128) |
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local jid = require("util/jid") |
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local st = require("util/stanza") |
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local set = require("util/set") |
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local delegation_session = module:shared("/*/delegation/session") |
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if delegation_session.connected_cb == nil then |
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-- set used to have connected event listeners |
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-- which allow a host to react on events from |
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-- other hosts |
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delegation_session.connected_cb = set.new() |
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end |
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local connected_cb = delegation_session.connected_cb |
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local _DELEGATION_NS = 'urn:xmpp:delegation:1' |
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local _FORWARDED_NS = 'urn:xmpp:forward:0' |
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local _DISCO_NS = 'http://jabber.org/protocol/disco#info' |
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local _ORI_ID_PREFIX = "IQ_RESULT_" |
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local _MAIN_SEP = '::' |
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local _BARE_SEP = ':bare:' |
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local _MAIN_PREFIX = _DELEGATION_NS.._MAIN_SEP |
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local _BARE_PREFIX = _DELEGATION_NS.._BARE_SEP |
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local _PREFIXES = {_MAIN_PREFIX, _BARE_PREFIX} |
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local disco_nest |
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module:log("debug", "Loading namespace delegation module "); |
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--> Configuration management <-- |
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local ns_delegations = module:get_option("delegations", {}) |
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local jid2ns = {} |
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for namespace, ns_data in pairs(ns_delegations) do |
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-- "connected" contain the full jid of connected managing entity |
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ns_data.connected = nil |
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if ns_data.jid then |
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if jid2ns[ns_data.jid] == nil then |
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jid2ns[ns_data.jid] = {} |
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end |
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jid2ns[ns_data.jid][namespace] = ns_data |
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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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else |
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module:log("warn", "Ignoring delegation for %s: no jid specified", tostring(namespace)) |
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ns_delegations[namespace] = nil |
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end |
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end |
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local function advertise_delegations(session, to_jid) |
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-- send <message/> stanza to advertise delegations |
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-- as expained in § 4.2 |
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local message = st.message({from=module.host, to=to_jid}) |
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:tag("delegation", {xmlns=_DELEGATION_NS}) |
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-- we need to check if a delegation is granted because the configuration |
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-- can be complicated if some delegations are granted to bare jid |
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-- and other to full jids, and several resources are connected. |
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local have_delegation = false |
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for namespace, ns_data in pairs(jid2ns[to_jid]) do |
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if ns_data.connected == to_jid then |
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have_delegation = true |
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message:tag("delegated", {namespace=namespace}) |
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if type(ns_data.filtering) == "table" then |
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for _, attribute in pairs(ns_data.filtering) do |
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message:tag("attribute", {name=attribute}):up() |
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end |
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message:up() |
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end |
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end |
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end |
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if have_delegation then |
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session.send(message) |
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end |
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end |
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local function set_connected(entity_jid) |
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-- set the "connected" key for all namespace managed by entity_jid |
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-- if the namespace has already a connected entity, ignore the new one |
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local function set_config(jid_) |
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for namespace, ns_data in pairs(jid2ns[jid_]) do |
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if ns_data.connected == nil then |
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ns_data.connected = entity_jid |
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disco_nest(namespace, entity_jid) |
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end |
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end |
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end |
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local bare_jid = jid.bare(entity_jid) |
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set_config(bare_jid) |
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-- We can have a bare jid of a full jid specified in configuration |
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105 |
-- so we try our luck with both (first connected resource will |
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106 |
-- manage the namespaces in case of bare jid) |
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107 |
if bare_jid ~= entity_jid then |
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108 |
set_config(entity_jid) |
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109 |
jid2ns[entity_jid] = jid2ns[bare_jid] |
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110 |
end |
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111 |
end |
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112 |
|
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113 |
local function on_presence(event) |
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114 |
local session = event.origin |
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115 |
local bare_jid = jid.bare(session.full_jid) |
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116 |
|
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117 |
if jid2ns[bare_jid] or jid2ns[session.full_jid] then |
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118 |
set_connected(session.full_jid) |
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119 |
advertise_delegations(session, session.full_jid) |
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120 |
end |
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121 |
end |
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122 |
|
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123 |
local function on_component_connected(event) |
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124 |
-- method called by the module loaded by the component |
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125 |
-- /!\ the event come from the component host, |
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126 |
-- not from the host of this module |
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127 |
local session = event.session |
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128 |
local bare_jid = jid.join(session.username, session.host) |
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129 |
|
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130 |
local jid_delegations = jid2ns[bare_jid] |
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131 |
if jid_delegations ~= nil then |
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132 |
set_connected(bare_jid) |
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133 |
advertise_delegations(session, bare_jid) |
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134 |
end |
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135 |
end |
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136 |
|
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137 |
local function on_component_auth(event) |
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138 |
-- react to component-authenticated event from this host |
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139 |
-- and call the on_connected methods from all other hosts |
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140 |
-- needed for the component to get delegations advertising |
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141 |
for callback in connected_cb:items() do |
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142 |
callback(event) |
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143 |
end |
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144 |
end |
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145 |
|
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146 |
connected_cb:add(on_component_connected) |
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147 |
module:hook('component-authenticated', on_component_auth) |
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148 |
module:hook('presence/initial', on_presence) |
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149 |
|
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150 |
|
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151 |
--> delegated namespaces hook <-- |
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152 |
|
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153 |
local function managing_ent_result(event) |
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154 |
-- this function manage iq results from the managing entity |
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155 |
-- it do a couple of security check before sending the |
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156 |
-- result to the managed entity |
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157 |
local session, stanza = event.origin, event.stanza |
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158 |
if stanza.attr.to ~= module.host then |
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159 |
module:log("warn", 'forwarded stanza result has "to" attribute not addressed to current host, id conflict ?') |
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160 |
return |
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161 |
end |
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162 |
module:unhook("iq-result/host/"..stanza.attr.id, managing_ent_result) |
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163 |
|
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164 |
-- lot of checks to do... |
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165 |
local delegation = stanza.tags[1] |
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166 |
if #stanza ~= 1 or delegation.name ~= "delegation" or |
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167 |
delegation.attr.xmlns ~= _DELEGATION_NS then |
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168 |
session.send(st.error_reply(stanza, 'modify', 'not-acceptable')) |
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169 |
return true |
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170 |
end |
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171 |
|
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172 |
local forwarded = delegation.tags[1] |
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173 |
if #delegation ~= 1 or forwarded.name ~= "forwarded" or |
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174 |
forwarded.attr.xmlns ~= _FORWARDED_NS then |
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175 |
session.send(st.error_reply(stanza, 'modify', 'not-acceptable')) |
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176 |
return true |
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177 |
end |
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178 |
|
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179 |
local iq = forwarded.tags[1] |
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180 |
if #forwarded ~= 1 or iq.name ~= "iq" or #iq ~= 1 then |
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181 |
session.send(st.error_reply(stanza, 'modify', 'not-acceptable')) |
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182 |
return true |
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183 |
end |
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184 |
|
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185 |
local namespace = iq.tags[1].xmlns |
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186 |
local ns_data = ns_delegations[namespace] |
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187 |
local original = ns_data[_ORI_ID_PREFIX..stanza.attr.id] |
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188 |
|
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189 |
if stanza.attr.from ~= ns_data.connected or iq.attr.type ~= "result" or |
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190 |
iq.attr.id ~= original.attr.id or iq.attr.to ~= original.attr.from then |
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191 |
session.send(st.error_reply(stanza, 'auth', 'forbidden')) |
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192 |
module:send(st.error_reply(original, 'cancel', 'service-unavailable')) |
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193 |
return true |
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194 |
end |
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195 |
|
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196 |
-- at this point eveything is checked, |
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197 |
-- and we (hopefully) can send the the result safely |
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198 |
module:send(iq) |
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199 |
end |
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200 |
|
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201 |
local function forward_iq(stanza, ns_data) |
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202 |
local to_jid = ns_data.connected |
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203 |
local iq_stanza = st.iq({ from=module.host, to=to_jid, type="set" }) |
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204 |
:tag("delegation", { xmlns=_DELEGATION_NS }) |
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205 |
:tag("forwarded", { xmlns=_FORWARDED_NS }) |
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206 |
:add_child(stanza) |
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207 |
local iq_id = iq_stanza.attr.id |
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208 |
-- we save the original stanza to check the managing entity result |
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209 |
ns_data[_ORI_ID_PREFIX..iq_id] = stanza |
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210 |
module:hook("iq-result/host/"..iq_id, managing_ent_result) |
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211 |
module:send(iq_stanza) |
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212 |
end |
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|
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local function iq_hook(event) |
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-- general hook for all the iq which forward delegated ones |
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-- and continue normal behaviour else. If a namespace is |
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-- delegated but managing entity is offline, a service-unavailable |
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-- error will be sent, as requested by the XEP |
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local session, stanza = event.origin, event.stanza |
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if #stanza == 1 and stanza.attr.type == 'get' or stanza.attr.type == 'set' then |
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local namespace = stanza.tags[1].attr.xmlns |
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local ns_data = ns_delegations[namespace] |
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223 |
|
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if ns_data then |
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if stanza.attr.from == ns_data.connected then |
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-- we don't forward stanzas from managing entity itself |
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return |
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228 |
end |
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if ns_data.filtering then |
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local first_child = stanza.tags[1] |
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for _, attribute in ns_data.filtering do |
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-- if any filtered attribute if not present, |
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-- we must continue the normal bahaviour |
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if not first_child.attr[attribute] then |
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-- Filtered attribute is not present, we do normal workflow |
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return; |
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237 |
end |
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238 |
end |
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239 |
end |
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240 |
if not ns_data.connected then |
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module:log("warn", "No connected entity to manage "..namespace) |
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session.send(st.error_reply(stanza, 'cancel', 'service-unavailable')) |
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243 |
else |
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244 |
forward_iq(stanza, ns_data) |
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245 |
end |
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246 |
return true |
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247 |
else |
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248 |
-- we have no delegation, we continue normal behaviour |
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249 |
return |
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250 |
end |
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251 |
end |
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252 |
end |
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253 |
|
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254 |
module:hook("iq/self", iq_hook, 2^32) |
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module:hook("iq/host", iq_hook, 2^32) |
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256 |
|
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257 |
|
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258 |
--> discovery nesting <-- |
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259 |
|
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260 |
-- disabling internal features/identities |
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261 |
|
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262 |
-- modules whose features/identities are managed by delegation |
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263 |
local disabled_modules = set.new() |
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264 |
local disabled_identities = set.new() |
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265 |
|
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266 |
local function identity_added(event) |
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267 |
local source = event.source |
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268 |
if disabled_modules:contains(source) then |
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269 |
local item = event.item |
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270 |
local category, type_, name = item.category, item.type, item.name |
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271 |
module:log("debug", "Removing (%s/%s%s) identity because of delegation", category, type_, name and "/"..name or "") |
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272 |
disabled_identities:add(item) |
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273 |
source:remove_item("identity", item) |
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274 |
end |
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275 |
end |
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276 |
|
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277 |
local function feature_added(event) |
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278 |
local source, item = event.source, event.item |
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279 |
for namespace, _ in pairs(ns_delegations) do |
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280 |
if source ~= module and string.sub(item, 1, #namespace) == namespace then |
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281 |
module:log("debug", "Removing %s feature which is delegated", item) |
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282 |
source:remove_item("feature", item) |
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283 |
disabled_modules:add(source) |
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284 |
if source.items and source.items.identity then |
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285 |
-- we remove all identities added by the source module |
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286 |
-- that can cause issues if the module manages several features/identities |
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287 |
-- but this case is probably rare (or doesn't happen at all) |
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|
288 |
-- FIXME: any better way ? |
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289 |
for _, identity in pairs(source.items.identity) do |
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|
290 |
identity_added({source=source, item=identity}) |
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|
291 |
end |
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292 |
end |
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|
293 |
end |
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|
294 |
end |
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|
295 |
end |
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|
296 |
|
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|
297 |
-- for disco nesting (see § 7.2) we need to remove internal features |
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|
298 |
-- we use handle_items as it allow to remove already added features |
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|
299 |
-- and catch the ones which can come later |
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300 |
module:handle_items("feature", feature_added, function(_) end) |
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|
301 |
module:handle_items("identity", identity_added, function(_) end, false) |
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302 |
|
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303 |
|
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|
304 |
-- managing entity features/identities collection |
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|
305 |
|
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|
306 |
local disco_error |
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|
307 |
local bare_features = set.new() |
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|
308 |
local bare_identities = {} |
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|
309 |
|
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|
310 |
local function disco_result(event) |
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|
311 |
-- parse result from disco nesting request |
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|
312 |
-- and fill module features/identities and bare_features/bare_identities accordingly |
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|
313 |
local session, stanza = event.origin, event.stanza |
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|
314 |
if stanza.attr.to ~= module.host then |
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|
315 |
module:log("warn", 'Stanza result has "to" attribute not addressed to current host, id conflict ?') |
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|
316 |
return |
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|
317 |
end |
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|
318 |
module:unhook("iq-result/host/"..stanza.attr.id, disco_result) |
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|
319 |
module:unhook("iq-error/host/"..stanza.attr.id, disco_error) |
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|
320 |
local query = stanza:get_child("query", _DISCO_NS) |
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321 |
if not query or not query.attr.node then |
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|
322 |
session.send(st.error_reply(stanza, 'modify', 'not-acceptable')) |
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|
323 |
return true |
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|
324 |
end |
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|
325 |
|
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|
326 |
local node = query.attr.node |
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|
327 |
local main |
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|
328 |
|
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|
329 |
if string.sub(node, 1, #_MAIN_PREFIX) == _MAIN_PREFIX then |
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|
330 |
main=true |
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|
331 |
elseif string.sub(node, 1, #_BARE_PREFIX) == _BARE_PREFIX then |
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|
332 |
main=false |
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|
333 |
else |
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|
334 |
module:log("warn", "Unexpected node: "..node) |
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|
335 |
session.send(st.error_reply(stanza, 'modify', 'not-acceptable')) |
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|
336 |
return true |
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|
337 |
end |
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|
338 |
|
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|
339 |
for feature in query:childtags("feature") do |
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|
340 |
local namespace = feature.attr.var |
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|
341 |
if main then |
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|
342 |
if not module:has_feature(namespace) then -- we avoid doubling features in case of disconnection/reconnexion |
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|
343 |
module:add_feature(namespace) |
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|
344 |
end |
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|
345 |
else |
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|
346 |
bare_features:add(namespace) |
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|
347 |
end |
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|
348 |
end |
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|
349 |
for identity in query:childtags("identity") do |
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|
350 |
local category, type_, name = identity.attr.category, identity.attr.type, identity.attr.name |
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|
351 |
if main then |
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|
352 |
if not module:has_identity(category, type_, name) then |
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|
353 |
module:add_identity(category, type_, name) |
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|
354 |
end |
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|
355 |
else |
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|
356 |
local found=false |
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|
357 |
for _, item in ipairs(bare_identities) do |
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|
358 |
if item.category == category and item.type == type_ and item.name == name then |
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|
359 |
found=true |
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changeset
|
360 |
break |
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changeset
|
361 |
end |
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changeset
|
362 |
end |
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changeset
|
363 |
if not found then |
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|
364 |
table.insert(bare_identities, {category=category, type=type_, name=name}) |
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changeset
|
365 |
end |
1716
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changeset
|
366 |
end |
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changeset
|
367 |
end |
c1973605d096
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changeset
|
368 |
end |
c1973605d096
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changeset
|
369 |
|
1718
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|
370 |
function disco_error(event) |
1716
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|
371 |
local stanza = event.stanza |
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|
372 |
if stanza.attr.to ~= module.host then |
c1973605d096
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|
373 |
module:log("warn", 'Stanza result has "to" attribute not addressed to current host, id conflict ?') |
c1973605d096
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|
374 |
return |
c1973605d096
mod_delegation: disco nesting for host
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changeset
|
375 |
end |
1718
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|
376 |
module:unhook("iq-result/host/"..stanza.attr.id, disco_result) |
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|
377 |
module:unhook("iq-error/host/"..stanza.attr.id, disco_error) |
1716
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|
378 |
module:log("warn", "Got an error while requesting disco for nesting to "..stanza.attr.from) |
c1973605d096
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changeset
|
379 |
module:log("warn", "Ignoring disco nesting") |
c1973605d096
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changeset
|
380 |
end |
c1973605d096
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changeset
|
381 |
|
c1973605d096
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changeset
|
382 |
function disco_nest(namespace, entity_jid) |
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|
383 |
for _, prefix in ipairs(_PREFIXES) do |
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changeset
|
384 |
local node = prefix..namespace |
1716
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changeset
|
385 |
|
1718
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changeset
|
386 |
local iq = st.iq({from=module.host, to=entity_jid, type='get'}) |
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changeset
|
387 |
:tag('query', {xmlns=_DISCO_NS, node=node}) |
1716
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changeset
|
388 |
|
1718
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changeset
|
389 |
local iq_id = iq.attr.id |
1716
c1973605d096
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changeset
|
390 |
|
1718
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changeset
|
391 |
module:hook("iq-result/host/"..iq_id, disco_result) |
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changeset
|
392 |
module:hook("iq-error/host/"..iq_id, disco_error) |
3d83f5337a73
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changeset
|
393 |
module:send(iq) |
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changeset
|
394 |
end |
1716
c1973605d096
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diff
changeset
|
395 |
end |
1717
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changeset
|
396 |
|
01e9465f8f80
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changeset
|
397 |
-- disco to bare jids special case |
01e9465f8f80
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changeset
|
398 |
|
01e9465f8f80
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changeset
|
399 |
module:hook("account-disco-info", function(event) |
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changeset
|
400 |
-- this event is called when a disco info request is done on a bare jid |
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changeset
|
401 |
-- we get the final reply and filter delegated features/identities |
01e9465f8f80
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changeset
|
402 |
local reply = event.reply; |
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changeset
|
403 |
reply.tags[1]:maptags(function(child) |
01e9465f8f80
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changeset
|
404 |
if child.name == 'feature' then |
01e9465f8f80
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changeset
|
405 |
local feature_ns = child.attr.var |
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changeset
|
406 |
for namespace, _ in pairs(ns_delegations) do |
01e9465f8f80
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changeset
|
407 |
if string.sub(feature_ns, 1, #namespace) == namespace then |
01e9465f8f80
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changeset
|
408 |
module:log("debug", "Removing feature namespace %s which is delegated", feature_ns) |
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changeset
|
409 |
return nil |
01e9465f8f80
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changeset
|
410 |
end |
01e9465f8f80
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changeset
|
411 |
end |
01e9465f8f80
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changeset
|
412 |
elseif child.name == 'identity' then |
01e9465f8f80
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changeset
|
413 |
for item in disabled_identities:items() do |
01e9465f8f80
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changeset
|
414 |
if item.category == child.attr.category |
01e9465f8f80
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|
415 |
and item.type == child.attr.type |
01e9465f8f80
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changeset
|
416 |
-- we don't check name, because mod_pep use a name for main disco, but not in account-disco-info hook |
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changeset
|
417 |
-- and item.name == child.attr.name |
01e9465f8f80
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changeset
|
418 |
then |
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changeset
|
419 |
module:log("debug", "Removing (%s/%s%s) identity because of delegation", item.category, item.type, item.name and "/"..item.name or "") |
01e9465f8f80
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changeset
|
420 |
return nil |
01e9465f8f80
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changeset
|
421 |
end |
01e9465f8f80
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parents:
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diff
changeset
|
422 |
end |
01e9465f8f80
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parents:
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diff
changeset
|
423 |
end |
01e9465f8f80
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changeset
|
424 |
return child |
01e9465f8f80
mod_delegation: delegated features/identities removal for disco info requests on bare jid
Goffi <goffi@goffi.org>
parents:
1716
diff
changeset
|
425 |
end) |
1718
3d83f5337a73
mod_delegation: disco info request on bare jid is now managed
Goffi <goffi@goffi.org>
parents:
1717
diff
changeset
|
426 |
for feature in bare_features:items() do |
3d83f5337a73
mod_delegation: disco info request on bare jid is now managed
Goffi <goffi@goffi.org>
parents:
1717
diff
changeset
|
427 |
reply:tag('feature', {var=feature}):up(); |
3d83f5337a73
mod_delegation: disco info request on bare jid is now managed
Goffi <goffi@goffi.org>
parents:
1717
diff
changeset
|
428 |
end |
3d83f5337a73
mod_delegation: disco info request on bare jid is now managed
Goffi <goffi@goffi.org>
parents:
1717
diff
changeset
|
429 |
for _, item in ipairs(bare_identities) do |
3d83f5337a73
mod_delegation: disco info request on bare jid is now managed
Goffi <goffi@goffi.org>
parents:
1717
diff
changeset
|
430 |
reply:tag('identity', {category=item.category, type=item.type, name=item.name}):up(); |
3d83f5337a73
mod_delegation: disco info request on bare jid is now managed
Goffi <goffi@goffi.org>
parents:
1717
diff
changeset
|
431 |
end |
3d83f5337a73
mod_delegation: disco info request on bare jid is now managed
Goffi <goffi@goffi.org>
parents:
1717
diff
changeset
|
432 |
|
1717
01e9465f8f80
mod_delegation: delegated features/identities removal for disco info requests on bare jid
Goffi <goffi@goffi.org>
parents:
1716
diff
changeset
|
433 |
end, -2^32); |