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annotate plugins/mod_http_altconnect.lua @ 14179:25beb66fab38 13.0

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util.crypto: Use post-Lua 5.1 buffer API Tha Lua 5.1 buffer API was frustrating to work with. luaL_prepbuffer() only allocates LUAL_BUFFERSIZE - there is no way to request a specific size. LUAL_BUFFERSIZE is set to BUFSIZ by default, which is generally 8192 bytes on Linux, however it may vary between platforms. The variation means this buffer could potentially overflow (small BUFSIZ with large signature). The Lua 5.2+ buffer API enables requesting a specific buffer size, so that's what we do now.
author Matthew Wild <mwild1@gmail.com>
date Mon, 25 May 2026 15:11:47 +0100
parents 569fae28a2f3
children
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1 -- mod_http_altconnect
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2 -- XEP-0156: Discovering Alternative XMPP Connection Methods
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3
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4 module:depends"http";
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5
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6 local mm = require "prosody.core.modulemanager";
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7 local json = require"prosody.util.json";
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8 local st = require"prosody.util.stanza";
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9 local array = require"prosody.util.array";
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10
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11 local advertise_bosh = module:get_option_boolean("advertise_bosh", true);
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12 local advertise_websocket = module:get_option_boolean("advertise_websocket", true);
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13
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14 local function get_supported()
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15 local uris = array();
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16 if advertise_bosh and (mm.is_loaded(module.host, "bosh") or mm.is_loaded("*", "bosh")) then
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17 uris:push({ rel = "urn:xmpp:alt-connections:xbosh", href = module:http_url("bosh", "/http-bind") });
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18 end
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19 if advertise_websocket and (mm.is_loaded(module.host, "websocket") or mm.is_loaded("*", "websocket")) then
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20 uris:push({ rel = "urn:xmpp:alt-connections:websocket", href = module:http_url("websocket", "xmpp-websocket"):gsub("^http", "ws") });
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21 end
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22 return uris;
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23 end
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26 local function GET_xml(event)
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27 local response = event.response;
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28 local xrd = st.stanza("XRD", { xmlns='http://docs.oasis-open.org/ns/xri/xrd-1.0' });
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29 local uris = get_supported();
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30 for _, method in ipairs(uris) do
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31 xrd:tag("Link", method):up();
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32 end
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33 response.headers.content_type = "application/xrd+xml"
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34 response.headers.access_control_allow_origin = "*";
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35 return '<?xml version="1.0" encoding="UTF-8"?>' .. tostring(xrd);
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36 end
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37
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38 local function GET_json(event)
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39 local response = event.response;
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40 local jrd = { links = get_supported() };
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41 response.headers.content_type = "application/json"
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42 response.headers.access_control_allow_origin = "*";
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43 return json.encode(jrd);
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44 end;
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45
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46 module:provides("http", {
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47 default_path = "/.well-known";
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48 route = {
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49 ["GET /host-meta"] = GET_xml;
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50 ["GET /host-meta.json"] = GET_json;
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51 };
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52 });