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annotate mod_delegation/mod_delegation.lua @ 1709:59ba224bf145

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mod_delegation: XEP-0355 implementation, first draft (configuration management + delegations advertising)
author Goffi <goffi@goffi.org>
date Fri, 17 Apr 2015 21:02:22 +0200
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children b68eed25b880
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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
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8 local jid = require("util/jid")
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9 local st = require("util/stanza")
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10 local set = require("util/set")
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11
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12 local delegation_session = module:shared("/*/delegation/session")
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13
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14 if delegation_session.connected_cb == nil then
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15 -- set used to have connected event listeners
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16 -- which allow a host to react on events from
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17 -- other hosts
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18 delegation_session.connected_cb = set.new()
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19 end
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20 local connected_cb = delegation_session.connected_cb
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21
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22 local _DELEGATION_NS = 'urn:xmpp:delegation:1'
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23 -- local _FORWARDED_NS = 'urn:xmpp:forward:0'
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24
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25
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26 module:log("debug", "Loading namespace delegation module ");
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27
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28
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29 --> Configuration management <--
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30
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31 local ns_delegations = module:get_option("delegations", {})
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32
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33 local jid2ns = {}
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34 for namespace, config in pairs(ns_delegations) do
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35 -- "connected" contain the full jid of connected managing entity
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36 config.connected = nil
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37 if config.jid then
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38 if jid2ns[config.jid] == nil then
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39 jid2ns[config.jid] = {}
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40 end
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41 jid2ns[config.jid][namespace] = config
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42 else
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43 module:log("warn", "Ignoring delegation for %s: no jid specified", tostring(namespace))
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44 ns_delegations[namespace] = nil
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45 end
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46 end
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47
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48
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49 local function advertise_delegations(session, to_jid)
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50 -- send <message/> stanza to advertise delegations
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51 -- as expained in § 4.2
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52 local message = st.message({from=module.host, to=to_jid})
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53 :tag("delegation", {xmlns=_DELEGATION_NS})
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54
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55 -- we need to check if a delegation is granted because the configuration
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56 -- can be complicated if some delegations are granted to bare jid
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57 -- and other to full jids, and several resources are connected.
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58 local have_delegation = false
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59
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60 for namespace, config in pairs(jid2ns[to_jid]) do
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61 if config.connected == to_jid then
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62 have_delegation = true
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63 message:tag("delegated", {namespace=namespace})
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64 if type(config.filtering) == "table" then
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65 for _, attribute in pairs(config.filtering) do
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66 message:tag("attribute", {name=attribute}):up()
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67 end
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68 message:up()
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69 end
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70 end
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71 end
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72
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73 if have_delegation then
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74 session.send(message)
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75 end
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76 end
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77
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78 local function set_connected(entity_jid)
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79 -- set the "connected" key for all namespace managed by entity_jid
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80 -- if the namespace has already a connected entity, ignore the new one
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81 local function set_config(jid_)
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82 for _, config in pairs(jid2ns[jid_]) do
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83 if config.connected == nil then
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84 config.connected = entity_jid
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85 end
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86 end
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87 end
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88 local bare_jid = jid.bare(entity_jid)
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89 set_config(bare_jid)
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90 -- We can have a bare jid of a full jid specified in configuration
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91 -- so we try our luck with both (first connected resource will
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92 -- manage the namespaces in case of bare jid)
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93 if bare_jid ~= entity_jid then
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94 set_config(entity_jid)
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95 jid2ns[entity_jid] = jid2ns[bare_jid]
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96 end
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97 end
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98
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99 local function on_presence(event)
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100 local session = event.origin
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101 local bare_jid = jid.bare(session.full_jid)
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102
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103 if jid2ns[bare_jid] or jid2ns[session.full_jid] then
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104 set_connected(session.full_jid)
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105 advertise_delegations(session, session.full_jid)
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106 end
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107 end
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108
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109 local function on_component_connected(event)
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110 -- method called by the module loaded by the component
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111 -- /!\ the event come from the component host,
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112 -- not from the host of this module
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113 local session = event.session
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114 local bare_jid = jid.join(session.username, session.host)
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115
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116 local jid_delegations = jid2ns[bare_jid]
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117 if jid_delegations ~= nil then
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118 set_connected(bare_jid)
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119 advertise_delegations(session, bare_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_auth(event)
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124 -- react to component-authenticated event from this host
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125 -- and call the on_connected methods from all other hosts
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126 -- needed for the component to get delegations advertising
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127 for callback in connected_cb:items() do
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128 callback(event)
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129 end
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130 end
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131
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132 connected_cb:add(on_component_connected)
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133 module:hook('component-authenticated', on_component_auth)
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134 module:hook('presence/initial', on_presence)