Mercurial > prosody-modules

annotate mod_pubsub_mqtt/mod_pubsub_mqtt.lua @ 5326:dc058fcc3fe3

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mod_audit: Improve filtering options and add documentation to README
author Matthew Wild <mwild1@gmail.com>
date Fri, 07 Apr 2023 13:44:18 +0100
parents 85a7304cfea1
children 801f64e6d4e9
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1 module:set_global();
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2
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3 local mqtt = module:require "mqtt";
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4 local id = require "util.id";
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5 local st = require "util.stanza";
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6
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7 local function tostring_content(item)
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8 return tostring(item[1]);
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9 end
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10
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11 local data_translators = setmetatable({
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12 utf8 = {
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13 from_item = function (item)
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14 return item:find("{https://prosody.im/protocol/data}data#");
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15 end;
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16 to_item = function (payload)
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17 return st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = id.medium() })
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18 :text_tag("data", payload, { xmlns = "https://prosody.im/protocol/data" })
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19 end;
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20 };
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21 json = {
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22 from_item = function (item)
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23 return item:find("{urn:xmpp:json:0}json#");
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24 end;
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25 to_item = function (payload)
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26 return st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = id.medium() })
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27 :text_tag("json", payload, { xmlns = "urn:xmpp:json:0" });
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28 end;
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29 };
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30 atom_title = {
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31 from_item = function (item)
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32 return item:find("{http://www.w3.org/2005/Atom}entry/title#");
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33 end;
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34 to_item = function (payload)
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35 return st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = id.medium() })
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36 :tag("entry", { xmlns = "http://www.w3.org/2005/Atom" })
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37 :text_tag("title", payload, { type = "text" });
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38 end;
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39 };
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40 }, {
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41 __index = function () return { from_item = tostring }; end;
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42 });
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43
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44 local pubsub_services = {};
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45 local pubsub_subscribers = {};
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46 local packet_handlers = {};
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47
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48 function handle_packet(session, packet)
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49 module:log("debug", "MQTT packet received! Length: %d", packet.length);
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50 for k,v in pairs(packet) do
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51 module:log("debug", "MQTT %s: %s", tostring(k), tostring(v));
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52 end
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53 local handler = packet_handlers[packet.type];
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54 if not handler then
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55 module:log("warn", "Unhandled command: %s", tostring(packet.type));
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56 return;
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57 end
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58 handler(session, packet);
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59 end
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60
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61 function packet_handlers.connect(session, packet)
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62 session.conn:write(mqtt.serialize_packet{
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63 type = "connack";
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64 data = string.char(0x00, 0x00);
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65 });
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66 end
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67
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68 function packet_handlers.disconnect(session, packet)
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69 session.conn:close();
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70 end
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71
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72 function packet_handlers.publish(session, packet)
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73 module:log("info", "PUBLISH to %s", packet.topic);
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74 local host, payload_type, node = packet.topic:match("^([^/]+)/([^/]+)/(.+)$");
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75 if not host then
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76 module:log("warn", "Invalid topic format - expected: HOST/TYPE/NODE");
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77 return;
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78 end
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79 local pubsub = pubsub_services[host];
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80 if not pubsub then
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81 module:log("warn", "Unable to locate host/node: %s", packet.topic);
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82 return;
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83 end
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84
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85 local payload_translator = data_translators[payload_type];
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86 if not payload_translator or not payload_translator.to_item then
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87 module:log("warn", "Unsupported payload type '%s' on topic '%s'", payload_type, packet.topic);
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88 return;
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89 end
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90
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91 local payload_item = payload_translator.to_item(packet.data);
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92 local ok, err = pubsub:publish(node, true, payload_item.attr.id, payload_item);
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93 if not ok then
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94 module:log("warn", "Error publishing MQTT data: %s", tostring(err));
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95 end
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96 end
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97
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98 function packet_handlers.subscribe(session, packet)
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99 for _, topic in ipairs(packet.topics) do
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100 module:log("info", "SUBSCRIBE to %s", topic);
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101 local host, payload_type, node = topic:match("^([^/]+)/([^/]+)/(.+)$");
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102 if not host then
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103 module:log("warn", "Invalid topic format - expected: HOST/TYPE/NODE");
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104 return;
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105 end
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106 local pubsub = pubsub_subscribers[host];
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107 if not pubsub then
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108 module:log("warn", "Unable to locate host/node: %s", topic);
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109 return;
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110 end
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111 local node_subs = pubsub[node];
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112 if not node_subs then
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113 node_subs = {};
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114 pubsub[node] = node_subs;
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115 end
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116 session.subscriptions[topic] = payload_type;
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117 node_subs[session] = payload_type;
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118 end
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119
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120 end
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121
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122 function packet_handlers.pingreq(session, packet)
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123 session.conn:write(mqtt.serialize_packet{type = "pingresp"});
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124 end
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125
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126 local sessions = {};
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127
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128 local mqtt_listener = {};
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129
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130 function mqtt_listener.onconnect(conn)
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131 sessions[conn] = {
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132 conn = conn;
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133 stream = mqtt.new_stream();
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134 subscriptions = {};
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135 };
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136 end
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137
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138 function mqtt_listener.onincoming(conn, data)
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139 local session = sessions[conn];
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140 if session then
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141 local packets = session.stream:feed(data);
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142 for i = 1, #packets do
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143 handle_packet(session, packets[i]);
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144 end
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145 end
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146 end
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147
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148 function mqtt_listener.ondisconnect(conn)
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149 local session = sessions[conn];
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150 for topic in pairs(session.subscriptions) do
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151 local host, node = topic:match("^([^/]+)/(.+)$");
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152 local subs = pubsub_subscribers[host];
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153 if subs then
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154 local node_subs = subs[node];
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155 if node_subs then
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156 node_subs[session] = nil;
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157 end
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158 end
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159 end
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160 sessions[conn] = nil;
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161 module:log("debug", "MQTT client disconnected");
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162 end
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163
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164 module:provides("net", {
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165 default_port = 1883;
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166 listener = mqtt_listener;
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167 });
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168
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169 function module.add_host(module)
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170 local pubsub_module = hosts[module.host].modules.pubsub
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171 if pubsub_module then
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172 module:log("debug", "MQTT enabled for %s", module.host);
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173 module:depends("pubsub");
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174 pubsub_services[module.host] = assert(pubsub_module.service);
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175 local subscribers = {};
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176 pubsub_subscribers[module.host] = subscribers;
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177 local function handle_publish(event)
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178 -- Build MQTT packet
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179 local packet_types = setmetatable({}, {
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180 __index = function (self, payload_type)
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181 local packet = mqtt.serialize_packet{
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182 type = "publish";
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183 id = "\000\000";
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184 topic = module.host.."/"..payload_type.."/"..event.node;
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185 data = data_translators[payload_type].from_item(event.item) or "";
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186 };
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187 rawset(self, packet);
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188 return packet;
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189 end;
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190 });
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191 -- Broadcast to subscribers
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192 module:log("debug", "Broadcasting PUBLISH to subscribers of %s/*/%s", module.host, event.node);
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193 for session, payload_type in pairs(subscribers[event.node] or {}) do
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194 session.conn:write(packet_types[payload_type]);
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195 module:log("debug", "Sent to %s", tostring(session));
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196 end
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197 end
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198 pubsub_services[module.host].events.add_handler("item-published", handle_publish);
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199 function module.unload()
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200 module:log("debug", "MQTT disabled for %s", module.host);
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201 pubsub_module.service.remove_handler("item-published", handle_publish);
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202 pubsub_services[module.host] = nil;
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203 pubsub_subscribers[module.host] = nil;
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204 end
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205 end
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206 end