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annotate mod_auto156/mod_auto156.lua @ 5296:0f5657db1cfc

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mod_isolate_host: handle server-generated stanzas The hook for setting the no_host_isolation is only called for c2s sessions. This does not work for stanzas generated by the server, such as PEP notifications or presence probe answers. To handle that, we do per-stanza checks for the case that the origin is local.
author Jonas Schäfer <jonas@wielicki.name>
date Sat, 01 Apr 2023 12:03:08 +0200
parents 5d494dba9c02
children
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1 -- Synthesize XEP-0156 JSON from DNS
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2 local array = require "util.array";
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3 local encodings = require "util.encodings";
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4 local json = require "util.json";
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5 local promise = require "util.promise";
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6
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7 local dns = require"net.adns".resolver();
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8
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9 local function check_dns(domain)
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10 return dns:lookup_promise("_xmppconnect." .. domain, "TXT");
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11 end
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12
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13 local function check_domain(domain)
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14 return promise.resolve(domain):next(encodings.stringprep.nameprep):next(encodings.idna.to_ascii):next(
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15 function(domain_A)
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16 if not domain_A then
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17 return promise.reject(400);
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18 else
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19 return domain_A;
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20 end
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21 end):next(check_dns):next(function(txt)
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22 local uris = array();
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23 for _, cm in ipairs(txt) do
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24 local kind, uri = tostring(cm.txt):match("^_xmpp%-client%-(%w+)=([hpstw]+s?://.*)");
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25 if kind then
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26 uris:push({rel = "urn:xmpp:alt-connections:" .. kind, href = uri});
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27 end
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28 end
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29 if #uris == 0 then
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30 return promise.reject(404);
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31 end
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32 return {links=uris};
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33 end);
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34 end
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35
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36 module:depends("http");
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37 module:provides("http", {
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38 route = {
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39 ["GET /*"] = function(_, domain)
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40 return check_domain(domain):next(function(altmethods)
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41 return {headers = {content_type = "application/json"}, body = json.encode(altmethods)};
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42 end);
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43 end,
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44 },
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45 });
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46
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47 function module.command(args)
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48 local async = require "util.async";
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49 for _, domain in ipairs(args) do
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50 print(assert(async.wait_for(check_domain(domain):next(json.encode))));
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51 end
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52 end