annotate mod_delegation/mod_delegation.lua @ 1711:55b9ac807ac9

mod_delegation: delegated features/identities are removed from disco.
author Goffi <goffi@goffi.org>
date Fri, 17 Apr 2015 21:05:40 +0200
parents b68eed25b880
children c1973605d096
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 _ORI_ID_PREFIX = "IQ_RESULT_"
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30 module:log("debug", "Loading namespace delegation module ");
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32
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33 --> Configuration management <--
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34
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35 local ns_delegations = module:get_option("delegations", {})
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36
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37 local jid2ns = {}
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38 for namespace, ns_data in pairs(ns_delegations) do
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39 -- "connected" contain the full jid of connected managing entity
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40 ns_data.connected = nil
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41 if ns_data.jid then
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42 if jid2ns[ns_data.jid] == nil then
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43 jid2ns[ns_data.jid] = {}
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44 end
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45 jid2ns[ns_data.jid][namespace] = ns_data
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46 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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47 else
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48 module:log("warn", "Ignoring delegation for %s: no jid specified", tostring(namespace))
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49 ns_delegations[namespace] = nil
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50 end
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51 end
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52
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53
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54 local function advertise_delegations(session, to_jid)
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55 -- send <message/> stanza to advertise delegations
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56 -- as expained in § 4.2
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57 local message = st.message({from=module.host, to=to_jid})
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58 :tag("delegation", {xmlns=_DELEGATION_NS})
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59
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60 -- we need to check if a delegation is granted because the configuration
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61 -- can be complicated if some delegations are granted to bare jid
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62 -- and other to full jids, and several resources are connected.
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63 local have_delegation = false
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64
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65 for namespace, ns_data in pairs(jid2ns[to_jid]) do
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66 if ns_data.connected == to_jid then
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67 have_delegation = true
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68 message:tag("delegated", {namespace=namespace})
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69 if type(ns_data.filtering) == "table" then
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70 for _, attribute in pairs(ns_data.filtering) do
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71 message:tag("attribute", {name=attribute}):up()
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72 end
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73 message:up()
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74 end
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75 end
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76 end
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77
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78 if have_delegation then
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79 session.send(message)
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80 end
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81 end
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82
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83 local function set_connected(entity_jid)
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84 -- set the "connected" key for all namespace managed by entity_jid
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85 -- if the namespace has already a connected entity, ignore the new one
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86 local function set_config(jid_)
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87 for _, ns_data in pairs(jid2ns[jid_]) do
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88 if ns_data.connected == nil then
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89 ns_data.connected = entity_jid
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90 end
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91 end
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92 end
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93 local bare_jid = jid.bare(entity_jid)
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94 set_config(bare_jid)
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95 -- We can have a bare jid of a full jid specified in configuration
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96 -- so we try our luck with both (first connected resource will
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97 -- manage the namespaces in case of bare jid)
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98 if bare_jid ~= entity_jid then
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99 set_config(entity_jid)
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100 jid2ns[entity_jid] = jid2ns[bare_jid]
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101 end
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102 end
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103
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104 local function on_presence(event)
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105 local session = event.origin
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106 local bare_jid = jid.bare(session.full_jid)
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107
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108 if jid2ns[bare_jid] or jid2ns[session.full_jid] then
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109 set_connected(session.full_jid)
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110 advertise_delegations(session, session.full_jid)
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111 end
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112 end
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113
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114 local function on_component_connected(event)
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115 -- method called by the module loaded by the component
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116 -- /!\ the event come from the component host,
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117 -- not from the host of this module
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118 local session = event.session
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119 local bare_jid = jid.join(session.username, session.host)
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120
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121 local jid_delegations = jid2ns[bare_jid]
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122 if jid_delegations ~= nil then
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Goffi <goffi@goffi.org>
parents:
diff changeset
123 set_connected(bare_jid)
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Goffi <goffi@goffi.org>
parents:
diff changeset
124 advertise_delegations(session, bare_jid)
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Goffi <goffi@goffi.org>
parents:
diff changeset
125 end
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Goffi <goffi@goffi.org>
parents:
diff changeset
126 end
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Goffi <goffi@goffi.org>
parents:
diff changeset
127
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Goffi <goffi@goffi.org>
parents:
diff changeset
128 local function on_component_auth(event)
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parents:
diff changeset
129 -- react to component-authenticated event from this host
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parents:
diff changeset
130 -- and call the on_connected methods from all other hosts
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Goffi <goffi@goffi.org>
parents:
diff changeset
131 -- needed for the component to get delegations advertising
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Goffi <goffi@goffi.org>
parents:
diff changeset
132 for callback in connected_cb:items() do
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Goffi <goffi@goffi.org>
parents:
diff changeset
133 callback(event)
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Goffi <goffi@goffi.org>
parents:
diff changeset
134 end
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Goffi <goffi@goffi.org>
parents:
diff changeset
135 end
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Goffi <goffi@goffi.org>
parents:
diff changeset
136
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Goffi <goffi@goffi.org>
parents:
diff changeset
137 connected_cb:add(on_component_connected)
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Goffi <goffi@goffi.org>
parents:
diff changeset
138 module:hook('component-authenticated', on_component_auth)
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Goffi <goffi@goffi.org>
parents:
diff changeset
139 module:hook('presence/initial', on_presence)
1710
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parents: 1709
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140
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parents: 1709
diff changeset
141
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
142 --> delegated namespaces hook <--
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Goffi <goffi@goffi.org>
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143
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Goffi <goffi@goffi.org>
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144 local function managing_ent_result(event)
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145 -- this function manage iq results from the managing entity
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Goffi <goffi@goffi.org>
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146 -- it do a couple of security check before sending the
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147 -- result to the managed entity
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Goffi <goffi@goffi.org>
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148 local session, stanza = event.origin, event.stanza
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Goffi <goffi@goffi.org>
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149 if stanza.attr.to ~= module.host then
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150 module:log("warn", 'forwarded stanza result has "to" attribute not addressed to current host, id conflict ?')
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151 return
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diff changeset
152 end
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153 module:unhook("iq-result/host/"..stanza.attr.id, managing_ent_result)
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154
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155 -- lot of checks to do...
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Goffi <goffi@goffi.org>
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156 local delegation = stanza.tags[1]
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157 if #stanza ~= 1 or delegation.name ~= "delegation" or
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
158 delegation.attr.xmlns ~= _DELEGATION_NS then
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
159 session.send(st.error_reply(stanza, 'modify', 'not-acceptable'))
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160 return true
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
161 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
162
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Goffi <goffi@goffi.org>
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diff changeset
163 local forwarded = delegation.tags[1]
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
164 if #delegation ~= 1 or forwarded.name ~= "forwarded" or
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
165 forwarded.attr.xmlns ~= _FORWARDED_NS then
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
166 session.send(st.error_reply(stanza, 'modify', 'not-acceptable'))
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parents: 1709
diff changeset
167 return true
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Goffi <goffi@goffi.org>
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diff changeset
168 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
169
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Goffi <goffi@goffi.org>
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diff changeset
170 local iq = forwarded.tags[1]
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
171 if #forwarded ~= 1 or iq.name ~= "iq" or #iq ~= 1 then
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
172 session.send(st.error_reply(stanza, 'modify', 'not-acceptable'))
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
173 return true
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
174 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
175
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
176 local namespace = iq.tags[1].xmlns
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Goffi <goffi@goffi.org>
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diff changeset
177 local ns_data = ns_delegations[namespace]
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Goffi <goffi@goffi.org>
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diff changeset
178 local original = ns_data[_ORI_ID_PREFIX..stanza.attr.id]
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diff changeset
179
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
180 if stanza.attr.from ~= ns_data.connected or iq.attr.type ~= "result" or
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
181 iq.attr.id ~= original.attr.id or iq.attr.to ~= original.attr.from then
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
182 session.send(st.error_reply(stanza, 'auth', 'forbidden'))
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
183 module:send(st.error_reply(original, 'cancel', 'service-unavailable'))
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
184 return true
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
185 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
186
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
187 -- at this point eveything is checked,
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
188 -- and we (hopefully) can send the the result safely
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
189 module:send(iq)
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
190 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
191
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
192 local function forward_iq(stanza, ns_data)
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Goffi <goffi@goffi.org>
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diff changeset
193 local to_jid = ns_data.connected
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
194 local iq_stanza = st.iq({ from=module.host, to=to_jid, type="set" })
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
195 :tag("delegation", { xmlns=_DELEGATION_NS })
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Goffi <goffi@goffi.org>
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diff changeset
196 :tag("forwarded", { xmlns=_FORWARDED_NS })
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
197 :add_child(stanza)
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
198 local iq_id = iq_stanza.attr.id
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Goffi <goffi@goffi.org>
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diff changeset
199 -- we save the original stanza to check the managing entity result
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
200 ns_data[_ORI_ID_PREFIX..iq_id] = stanza
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
201 module:hook("iq-result/host/"..iq_id, managing_ent_result)
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
202 module:send(iq_stanza)
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
203 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
204
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
205 local function iq_hook(event)
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
206 -- general hook for all the iq which forward delegated ones
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
207 -- and continue normal behaviour else. If a namespace is
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
208 -- delegated but managing entity is offline, a service-unavailable
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
209 -- error will be sent, as requested by the XEP
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
210 local session, stanza = event.origin, event.stanza
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
211 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
212 local namespace = stanza.tags[1].attr.xmlns
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
213 local ns_data = ns_delegations[namespace]
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
214
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
215 if ns_data then
b68eed25b880 mod_delegation: iq forwarding to managing entity
Goffi <goffi@goffi.org>
parents: 1709
diff changeset
216 if ns_data.filtering then
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
217 local first_child = stanza.tags[1]
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
218 for _, attribute in ns_data.filtering do
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
219 -- if any filtered attribute if not present,
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
220 -- we must continue the normal bahaviour
b68eed25b880 mod_delegation: iq forwarding to managing entity
Goffi <goffi@goffi.org>
parents: 1709
diff changeset
221 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
222 -- Filtered attribute is not present, we do normal workflow
1710
b68eed25b880 mod_delegation: iq forwarding to managing entity
Goffi <goffi@goffi.org>
parents: 1709
diff changeset
223 return;
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
224 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
225 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
226 end
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
227 if not ns_data.connected then
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
228 module:log("warn", "No connected entity to manage "..namespace)
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
229 session.send(st.error_reply(stanza, 'cancel', 'service-unavailable'))
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
230 else
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
231 forward_iq(stanza, ns_data)
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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 return true
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
234 else
b68eed25b880 mod_delegation: iq forwarding to managing entity
Goffi <goffi@goffi.org>
parents: 1709
diff changeset
235 -- we have no delegation, we continue normal behaviour
b68eed25b880 mod_delegation: iq forwarding to managing entity
Goffi <goffi@goffi.org>
parents: 1709
diff changeset
236 return
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
237 end
b68eed25b880 mod_delegation: iq forwarding to managing entity
Goffi <goffi@goffi.org>
parents: 1709
diff changeset
238 end
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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
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Goffi <goffi@goffi.org>
parents: 1709
diff changeset
241 module:hook("iq/self", iq_hook, 2^32)
b68eed25b880 mod_delegation: iq forwarding to managing entity
Goffi <goffi@goffi.org>
parents: 1709
diff changeset
242 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
243
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
244
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
245 --> discovery nesting <--
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
246
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
247 -- modules whose features/identities are managed by delegation
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
248 local disabled_modules = set.new()
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
249
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
250 local function identity_added(event)
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
251 local source = event.source
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
252 if disabled_modules:contains(source) then
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
253 local item = event.item
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
254 local category, type_, name = item.category, item.type, item.name
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
Goffi <goffi@goffi.org>
parents: 1710
diff changeset
255 module:log("debug", "Removing (%s/%s%s) identity because of delegation", category, type_, name and "/"..name or "")
55b9ac807ac9 mod_delegation: delegated features/identities are removed from disco.
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256 source:remove_item("identity", item)
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257 end
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258
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259 end
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260
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Goffi <goffi@goffi.org>
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261 local function feature_added(event)
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262 local source, item = event.source, event.item
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263 for namespace, _ in pairs(ns_delegations) do
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parents: 1710
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264 if source ~= module and string.sub(item, 1, #namespace) == namespace then
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Goffi <goffi@goffi.org>
parents: 1710
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265 module:log("debug", "Removing %s feature which is delegated", item)
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266 source:remove_item("feature", item)
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267 disabled_modules:add(source)
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parents: 1710
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268 if source.items and source.items.identity then
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269 -- we remove all identities added by the source module
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parents: 1710
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270 -- that can cause issues if the module manages several features/identities
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parents: 1710
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271 -- but this case is probably rare (or doesn't happen at all)
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272 -- FIXME: any better way ?
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parents: 1710
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273 for _, identity in pairs(source.items.identity) do
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parents: 1710
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274 identity_added({source=source, item=identity})
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275 end
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276 end
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277 end
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278 end
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279 end
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280
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Goffi <goffi@goffi.org>
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281 -- for disco nesting (see § 7.2) we need to remove internal features
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Goffi <goffi@goffi.org>
parents: 1710
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282 -- we use handle_items as it allow to remove already added features
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Goffi <goffi@goffi.org>
parents: 1710
diff changeset
283 -- and catch the ones which can come later
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Goffi <goffi@goffi.org>
parents: 1710
diff changeset
284 module:handle_items("feature", feature_added, function(_) end)
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Goffi <goffi@goffi.org>
parents: 1710
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285 module:handle_items("identity", identity_added, function(_) end, false)