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comparison mod_isr/mod_isr.lua @ 5024:1cb762f72a91

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mod_isr: XEP-0397: Instant Stream Resumption
author Matthew Wild <mwild1@gmail.com>
date Sun, 28 Aug 2022 17:30:52 +0100
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5023:90772a9c92a0 5024:1cb762f72a91
1 local st = require "util.stanza";
2
3 local mod_smacks = module:depends("smacks");
4
5 local xmlns_sasl2 = "urn:xmpp:sasl:1";
6 local xmlns_sm = "urn:xmpp:sm:3";
7 local xmlns_isr = "https://xmpp.org/extensions/isr/0";
8 local xmlns_errors = "urn:ietf:params:xml:ns:xmpp-stanzas";
9
10 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
11 local isr_resume = auth:get_child("inst-resume", xmlns_isr);
12 if not isr_resume then return end
13 local is_using_token = isr_resume.attr["with-isr-token"] ~= "false";
14 if is_using_token then
15 -- TODO: If authing with token, set session.sasl_handler to our own
16 -- event.session.sasl_handler = ...
17 error("not yet implemented");
18 end
19
20 -- Cache resume element for future processing after SASL success
21 session.isr_sm_resume = isr_resume:get_child("resume", "urn:xmpp:sm:3");
22 end, 100);
23
24 module:hook("sasl2/c2s/success", function (event)
25 local session = event.session;
26 local sm_resume = session.isr_sm_resume;
27 if sm_resume then
28 session.isr_sm_resume = nil;
29 local resumed, err = mod_smacks.do_resume(session, sm_resume);
30 if not resumed then
31 local failed = st.stanza("failed", { xmlns = xmlns_sm, h = ("%d"):format(err.context.h) })
32 :tag(err.condition, { xmlns = xmlns_errors });
33 event.success:add_child(failed);
34 else
35 event.session = resumed.session;
36 event.isr_resumed = resumed;
37 event.success:tag("resumed", { xmlns = xmlns_sm,
38 h = ("%d"):format(event.session.handled_stanza_count);
39 previd = resumed.id; }):up();
40 end
41 end
42 end, 100);
43
44 module:hook("sasl2/c2s/success", function (event)
45 -- The authenticate response has already been sent at this point
46 local resumed = event.isr_resumed;
47 if resumed then
48 resumed.finish(); -- Finish resume and sync stanzas
49 end
50 end, -1100);
51
52 module:hook("sasl2/c2s/failure", function (event)
53 event.session.isr_sm_resume = nil;
54 end);
55