Mercurial > prosody-modules
annotate mod_pubsub_mqtt/mod_pubsub_mqtt.lua @ 5321:d02f465e2aff
mod_audit: Fix iteration of custom payloads to use ipairs
author | Matthew Wild <mwild1@gmail.com> |
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date | Fri, 07 Apr 2023 13:09:31 +0100 |
parents | 85a7304cfea1 |
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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 |