prosody-modules
7c16afc70d11
mod_muc_eventsource/mod_muc_eventsource.lua

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mod_muc_eventsource/mod_muc_eventsource.lua @ 2883:7c16afc70d11

mod_muc_eventsource: New module forked from mod_pubsub_eventsource, exposes room message stream over SSE
author Matthew Wild <mwild1@gmail.com>
date Mon, 19 Feb 2018 22:17:38 +0000
child 2897:39485b9bbdd6
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2883
7c16afc70d11 mod_muc_eventsource: New module forked from mod_pubsub_eventsource, exposes room message stream over SSE
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1 module:depends("http");
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2
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3 local jid_split = require "util.jid".split;
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4 local json = require "util.json";
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5
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6 local streams = {};
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7
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8 function client_closed(response)
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9 local node = response._eventsource_node;
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10 module:log("debug", "Destroying client for %q", node);
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11 streams[node][response] = nil;
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12 if next(streams[node]) == nil then
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13 streams[node] = nil;
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14 end
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15 end
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17 function serve_stream(event, node)
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18 module:log("debug", "Client subscribed to: %s", node);
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20 local response = event.response;
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21 response.on_destroy = client_closed;
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22 response._eventsource_node = node;
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23
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24 response.conn:write(table.concat({
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25 "HTTP/1.1 200 OK";
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26 "Content-Type: text/event-stream";
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27 "Access-Control-Allow-Origin: *";
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28 "Access-Control-Allow-Methods: GET";
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29 "Access-Control-Max-Age: 7200";
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30 "";
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31 "";
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32 }, "\r\n"));
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33
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34 local clientlist = streams[node];
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35 if not clientlist then
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36 clientlist = {};
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37 streams[node] = clientlist;
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38 end
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39 clientlist[response] = response.conn;
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40
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41 return true;
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42 end
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44 function handle_message(event)
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45 local room, stanza = event.room, event.stanza;
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46 local node = (jid_split(event.room.jid));
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47 local clientlist = streams[node];
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48 if not clientlist then module:log("debug", "No clients for %q", node); return; end
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49
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50 -- Extract body from message
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51 local body = event.stanza:get_child_text("body");
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52 if not body then
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53 return;
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54 end
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55 local nick = select(3, jid_split(stanza.attr.from));
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56 -- Encode body and broadcast to eventsource subscribers
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57 local json_data = json.encode({
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58 nick = nick;
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59 body = body;
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60 });
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61 local data = "data: "..json_data:gsub("\n", "\ndata: \n").."\n\n";
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62 for response, conn in pairs(clientlist) do
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63 conn:write(data);
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64 end
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65 end
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66
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67 module:provides("http", {
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68 name = "eventsource";
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69 route = {
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70 ["GET /*"] = serve_stream;
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71 };
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72 });
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75 module:hook("muc-broadcast-message", handle_message);