Mercurial > prosody-modules
view mod_pubsub_mqtt/mod_pubsub_mqtt.lua @ 5401:c8d04ac200fc
mod_http_oauth2: Reject loopback URIs as client_uri
This really should be a proper website with info, https://localhost is
not good enough. Ideally we'd validate that it's got proper DNS and is
actually reachable, but triggering HTTP or even DNS lookups seems like
it would carry abuse potential that would best to avoid.
author | Kim Alvefur <zash@zash.se> |
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date | Tue, 02 May 2023 16:20:55 +0200 |
parents | 85a7304cfea1 |
children | 801f64e6d4e9 |
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module:set_global(); local mqtt = module:require "mqtt"; local id = require "util.id"; local st = require "util.stanza"; local function tostring_content(item) return tostring(item[1]); end local data_translators = setmetatable({ utf8 = { from_item = function (item) return item:find("{https://prosody.im/protocol/data}data#"); end; to_item = function (payload) return st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = id.medium() }) :text_tag("data", payload, { xmlns = "https://prosody.im/protocol/data" }) end; }; json = { from_item = function (item) return item:find("{urn:xmpp:json:0}json#"); end; to_item = function (payload) return st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = id.medium() }) :text_tag("json", payload, { xmlns = "urn:xmpp:json:0" }); end; }; atom_title = { from_item = function (item) return item:find("{http://www.w3.org/2005/Atom}entry/title#"); end; to_item = function (payload) return st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = id.medium() }) :tag("entry", { xmlns = "http://www.w3.org/2005/Atom" }) :text_tag("title", payload, { type = "text" }); end; }; }, { __index = function () return { from_item = tostring }; end; }); local pubsub_services = {}; local pubsub_subscribers = {}; local packet_handlers = {}; function handle_packet(session, packet) module:log("debug", "MQTT packet received! Length: %d", packet.length); for k,v in pairs(packet) do module:log("debug", "MQTT %s: %s", tostring(k), tostring(v)); end local handler = packet_handlers[packet.type]; if not handler then module:log("warn", "Unhandled command: %s", tostring(packet.type)); return; end handler(session, packet); end function packet_handlers.connect(session, packet) session.conn:write(mqtt.serialize_packet{ type = "connack"; data = string.char(0x00, 0x00); }); end function packet_handlers.disconnect(session, packet) session.conn:close(); end function packet_handlers.publish(session, packet) module:log("info", "PUBLISH to %s", packet.topic); local host, payload_type, node = packet.topic:match("^([^/]+)/([^/]+)/(.+)$"); if not host then module:log("warn", "Invalid topic format - expected: HOST/TYPE/NODE"); return; end local pubsub = pubsub_services[host]; if not pubsub then module:log("warn", "Unable to locate host/node: %s", packet.topic); return; end local payload_translator = data_translators[payload_type]; if not payload_translator or not payload_translator.to_item then module:log("warn", "Unsupported payload type '%s' on topic '%s'", payload_type, packet.topic); return; end local payload_item = payload_translator.to_item(packet.data); local ok, err = pubsub:publish(node, true, payload_item.attr.id, payload_item); if not ok then module:log("warn", "Error publishing MQTT data: %s", tostring(err)); end end function packet_handlers.subscribe(session, packet) for _, topic in ipairs(packet.topics) do module:log("info", "SUBSCRIBE to %s", topic); local host, payload_type, node = topic:match("^([^/]+)/([^/]+)/(.+)$"); if not host then module:log("warn", "Invalid topic format - expected: HOST/TYPE/NODE"); return; end local pubsub = pubsub_subscribers[host]; if not pubsub then module:log("warn", "Unable to locate host/node: %s", topic); return; end local node_subs = pubsub[node]; if not node_subs then node_subs = {}; pubsub[node] = node_subs; end session.subscriptions[topic] = payload_type; node_subs[session] = payload_type; end end function packet_handlers.pingreq(session, packet) session.conn:write(mqtt.serialize_packet{type = "pingresp"}); end local sessions = {}; local mqtt_listener = {}; function mqtt_listener.onconnect(conn) sessions[conn] = { conn = conn; stream = mqtt.new_stream(); subscriptions = {}; }; end function mqtt_listener.onincoming(conn, data) local session = sessions[conn]; if session then local packets = session.stream:feed(data); for i = 1, #packets do handle_packet(session, packets[i]); end end end function mqtt_listener.ondisconnect(conn) local session = sessions[conn]; for topic in pairs(session.subscriptions) do local host, node = topic:match("^([^/]+)/(.+)$"); local subs = pubsub_subscribers[host]; if subs then local node_subs = subs[node]; if node_subs then node_subs[session] = nil; end end end sessions[conn] = nil; module:log("debug", "MQTT client disconnected"); end module:provides("net", { default_port = 1883; listener = mqtt_listener; }); function module.add_host(module) local pubsub_module = hosts[module.host].modules.pubsub if pubsub_module then module:log("debug", "MQTT enabled for %s", module.host); module:depends("pubsub"); pubsub_services[module.host] = assert(pubsub_module.service); local subscribers = {}; pubsub_subscribers[module.host] = subscribers; local function handle_publish(event) -- Build MQTT packet local packet_types = setmetatable({}, { __index = function (self, payload_type) local packet = mqtt.serialize_packet{ type = "publish"; id = "\000\000"; topic = module.host.."/"..payload_type.."/"..event.node; data = data_translators[payload_type].from_item(event.item) or ""; }; rawset(self, packet); return packet; end; }); -- Broadcast to subscribers module:log("debug", "Broadcasting PUBLISH to subscribers of %s/*/%s", module.host, event.node); for session, payload_type in pairs(subscribers[event.node] or {}) do session.conn:write(packet_types[payload_type]); module:log("debug", "Sent to %s", tostring(session)); end end pubsub_services[module.host].events.add_handler("item-published", handle_publish); function module.unload() module:log("debug", "MQTT disabled for %s", module.host); pubsub_module.service.remove_handler("item-published", handle_publish); pubsub_services[module.host] = nil; pubsub_subscribers[module.host] = nil; end end end