prosody-modules
2380a5d71448
mod_pubsub_eventsource/mod_pubsub_eventsource.lua

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mod_pubsub_eventsource/mod_pubsub_eventsource.lua @ 1241:2380a5d71448

mod_pubsub_eventsource: Add CORS headers for cross-domain support
author Matthew Wild <mwild1@gmail.com>
date Mon, 02 Dec 2013 03:06:10 +0000
parent 858:28dba9608499
child 1242:4d1226220e58
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28dba9608499 mod_pubsub_eventsource: An experimental plugin for allowing non-XMPP subscriptions to pubsub nodes over HTML5's server-sent events (SSE/EventSource) API
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1 module:depends("http");
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2 module:depends("pubsub");
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4 local streams = {};
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6 local service = hosts[module.host].modules.pubsub.service;
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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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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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41 return true;
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42 end
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44 function handle_update(event)
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45 module:log("debug", "Item published: %q", event.node);
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46 local node = event.node;
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47 local clientlist = streams[node];
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48 local data = "data: "..tostring(event.item):gsub("\n", "\ndata: \n").."\n\n";
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49 if not clientlist then module:log("debug", "No clients for %q", node); return; end
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50 for response, conn in pairs(clientlist) do
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51 conn:write(data);
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52 end
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53 end
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54
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55 module:provides("http", {
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56 name = "eventsource";
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57 route = {
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58 ["GET /*"] = serve_stream;
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59 };
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60 });
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61
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62 module:hook_object_event(service.events, "item-published", handle_update);