Mercurial > prosody-modules

annotate mod_pubsub_mqtt/mod_pubsub_mqtt.lua @ 5549:01a0b67a9afd

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mod_http_oauth2: Add TODO about disabling password grant Per recommendation in draft-ietf-oauth-security-topics-23 it should at the very least be disabled by default. However since this is used by the Snikket web portal some care needs to be taken not to break this, unless it's already broken by other changes to this module.
author Kim Alvefur <zash@zash.se>
date Fri, 16 Jun 2023 00:06:53 +0200
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