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annotate mod_muc_eventsource/mod_muc_eventsource.lua @ 6171:fe8222112cf4

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mod_conversejs: Serve base app at / This makes things slightly less awkward for the browser to figure out which URLs belong to a PWA. The app's "start URL" was previously without the '/' and therefore was not considered within the scope of the PWA. Now the canonical app URL will always have a '/'. Prosody/mod_http should take care of redirecting existing links without the trailing / to the new URL. If you have an installation at https://prosody/conversejs then it is now at https://prosody/conversejs/ (the first URL will now redirect to the second URL if you use it). The alternative would be to make the PWA scope include the parent, i.e. the whole of https://prosody/ in this case. This might get messy if other PWAs are provided by the same site or Prosody installation, however.
author Matthew Wild <mwild1@gmail.com>
date Tue, 11 Feb 2025 13:18:38 +0000
parents 39485b9bbdd6
children
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1 module:depends("http");
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2 local nodeprep = require "util.encodings".stringprep.nodeprep;
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4 local jid_split = require "util.jid".split;
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5 local json = require "util.json";
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7 local streams = {};
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9 function client_closed(response)
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10 local node = response._eventsource_node;
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11 module:log("debug", "Destroying client for %q", node);
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12 streams[node][response] = nil;
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13 if next(streams[node]) == nil then
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14 streams[node] = nil;
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15 end
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16 end
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18 function serve_stream(event, node)
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19 local response = event.response;
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20
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21 node = nodeprep(node);
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22 if node == nil then
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23 return 400;
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24 end
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25
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26 module:log("debug", "Client subscribed to: %s", node);
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28 response.on_destroy = client_closed;
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29 response._eventsource_node = node;
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31 response.conn:write(table.concat({
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32 "HTTP/1.1 200 OK";
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33 "Content-Type: text/event-stream";
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34 "Access-Control-Allow-Origin: *";
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35 "Access-Control-Allow-Methods: GET";
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36 "Access-Control-Max-Age: 7200";
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37 "";
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38 "";
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39 }, "\r\n"));
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41 local clientlist = streams[node];
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42 if not clientlist then
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43 clientlist = {};
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44 streams[node] = clientlist;
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45 end
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46 clientlist[response] = response.conn;
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47
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48 return true;
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49 end
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51 function handle_message(event)
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52 local room, stanza = event.room, event.stanza;
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53 local node = (jid_split(event.room.jid));
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54 local clientlist = streams[node];
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55 if not clientlist then module:log("debug", "No clients for %q", node); return; end
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56
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57 -- Extract body from message
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58 local body = event.stanza:get_child_text("body");
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59 if not body then
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60 return;
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61 end
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62 local nick = select(3, jid_split(stanza.attr.from));
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63 -- Encode body and broadcast to eventsource subscribers
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64 local json_data = json.encode({
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65 nick = nick;
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66 body = body;
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67 });
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68 local data = "data: "..json_data:gsub("\n", "\ndata: \n").."\n\n";
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69 for response, conn in pairs(clientlist) do
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70 conn:write(data);
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71 end
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72 end
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74 module:provides("http", {
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75 name = "eventsource";
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76 route = {
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77 ["GET /*"] = serve_stream;
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78 };
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79 });
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82 module:hook("muc-broadcast-message", handle_message);