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annotate plugins/mod_pubsub.lua @ 3821:cef2d5dc65e3

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mod_pubsub, util.pubsub: Support for unsubscribing
author Florian Zeitz <florob@babelmonkeys.de>
date Sun, 05 Dec 2010 02:46:08 +0100
parents 6f25c09916a5
children 150e58d69e60
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1 local pubsub = require "util.pubsub";
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2 local st = require "util.stanza";
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3 local jid_bare = require "util.jid".bare;
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4 local uuid_generate = require "util.uuid".generate;
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5
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6 require "core.modulemanager".load(module.host, "iq");
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7
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8 local xmlns_pubsub = "http://jabber.org/protocol/pubsub";
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9 local xmlns_pubsub_errors = "http://jabber.org/protocol/pubsub#errors";
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10 local xmlns_pubsub_event = "http://jabber.org/protocol/pubsub#event";
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11
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12 local service;
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13
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14 local handlers = {};
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15
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16 function handle_pubsub_iq(event)
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17 local origin, stanza = event.origin, event.stanza;
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18 local pubsub = stanza.tags[1];
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19 local action = pubsub.tags[1];
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20 local handler = handlers[stanza.attr.type.."_"..action.name];
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21 if handler then
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22 handler(origin, stanza, action);
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23 return true;
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24 end
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25 end
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26
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27 local pubsub_errors = {
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28 ["conflict"] = { "cancel", "conflict" };
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29 ["invalid-jid"] = { "modify", "bad-request", nil, "invalid-jid" };
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30 ["item-not-found"] = { "cancel", "item-not-found" };
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31 ["not-subscribed"] = { "modify", "unexpected-request", nil, "not-subscribed" };
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32 };
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33 function pubsub_error_reply(stanza, error)
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34 local e = pubsub_errors[error];
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35 local reply = st.error_reply(stanza, unpack(e, 1, 3));
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36 if e[4] then
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37 reply:tag(e[4], { xmlns = xmlns_pubsub_errors }):up();
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38 end
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39 return reply;
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40 end
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41
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42 function handlers.get_items(origin, stanza, items)
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43 local node = items.attr.node;
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44 local item = items:get_child("item");
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45 local id = item and item.attr.id;
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46 local data = st.stanza("items", { node = node });
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47 for _, entry in pairs(service:get(node, stanza.attr.from, id)) do
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48 data:add_child(entry);
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49 end
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50 if data then
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51 reply = st.reply(stanza)
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52 :tag("pubsub", { xmlns = xmlns_pubsub })
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53 :add_child(data);
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54 else
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55 reply = pubsub_error_reply(stanza, "item-not-found");
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56 end
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57 return origin.send(reply);
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58 end
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59
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60 function handlers.set_create(origin, stanza, create)
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61 local node = create.attr.node;
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62 local ok, ret, reply;
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63 if node then
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64 ok, ret = service:create(node, stanza.attr.from);
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65 if ok then
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66 reply = st.reply(stanza);
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67 else
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68 reply = pubsub_error_reply(stanza, ret);
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69 end
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70 else
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71 repeat
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72 node = uuid_generate();
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73 ok, ret = service:create(node, stanza.attr.from);
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74 until ok;
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75 reply = st.reply(stanza)
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76 :tag("pubsub", { xmlns = xmlns_pubsub })
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77 :tag("create", { node = node });
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78 end
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79 origin.send(reply);
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80 end
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81
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82 function handlers.set_subscribe(origin, stanza, subscribe)
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83 local node, jid = subscribe.attr.node, subscribe.attr.jid;
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84 if jid_bare(jid) ~= jid_bare(stanza.attr.from) then
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85 return origin.send(pubsub_error_reply(stanza, "invalid-jid"));
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86 end
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87 local ok, ret = service:add_subscription(node, stanza.attr.from, jid);
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88 local reply;
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89 if ok then
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90 reply = st.reply(stanza)
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91 :tag("pubsub", { xmlns = xmlns_pubsub })
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92 :tag("subscription", {
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93 node = node,
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94 jid = jid,
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95 subscription = "subscribed"
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96 });
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97 else
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98 reply = pubsub_error_reply(stanza, ret);
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99 end
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100 return origin.send(reply);
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101 end
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102
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103 function handlers.set_unsubscribe(origin, stanza, unsubscribe)
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104 local node, jid = unsubscribe.attr.node, unsubscribe.attr.jid;
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105 if jid_bare(jid) ~= jid_bare(stanza.attr.from) then
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106 return origin.send(pubsub_error_reply(stanza, "invalid-jid"));
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107 end
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108 local ok, ret = service:remove_subscription(node, stanza.attr.from, jid);
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109 local reply;
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110 if ok then
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111 reply = st.reply(stanza);
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112 else
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113 reply = pubsub_error_reply(stanza, ret);
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114 end
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115 return origin.send(reply);
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116 end
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117
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118 function handlers.set_publish(origin, stanza, publish)
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119 local node = publish.attr.node;
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120 local item = publish:get_child("item");
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121 local id = (item and item.attr.id) or uuid_generate();
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122 local ok, ret = service:publish(node, stanza.attr.from, id, item);
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123 local reply;
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124 if ok then
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125 reply = st.reply(stanza)
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126 :tag("pubsub", { xmlns = xmlns_pubsub })
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127 :tag("publish", { node = node })
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128 :tag("item", { id = id });
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129 else
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130 reply = pubsub_error_reply(stanza, ret);
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131 end
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132 return origin.send(reply);
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133 end
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134
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135 function simple_broadcast(node, jids, item)
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136 local message = st.message({ from = module.host, type = "headline" })
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137 :tag("event", { xmlns = xmlns_pubsub_event })
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138 :tag("items", { node = node })
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139 :add_child(item);
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140 for jid in pairs(jids) do
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141 module:log("debug", "Sending notification to %s", jid);
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142 message.attr.to = jid;
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143 core_post_stanza(hosts[module.host], message);
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144 end
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145 end
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146
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147 module:hook("iq/host/http://jabber.org/protocol/pubsub:pubsub", handle_pubsub_iq);
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148
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149 service = pubsub.new({
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150 broadcaster = simple_broadcast
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151 });
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152 module.environment.service = service;
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153