annotate mod_presence_dedup/mod_presence_dedup.lua @ 5518:d87d0e4a8516

mod_http_oauth2: Validate the OpenID 'prompt' parameter Without support for affecting the login and consent procedure, it seems sensible to inform the client that they can't change anything with this parameter.
author Kim Alvefur <zash@zash.se>
date Mon, 05 Jun 2023 22:19:17 +0200
parents 19924a2c4a48
children
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f24b02e0d706 mod_presence_dedup: Attempt at saving bandwith by deduplicating presence stanzas
Kim Alvefur <zash@zash.se>
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1 local st = require "util.stanza";
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2 local cache = require "util.cache";
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3 local add_filter = require "util.filters".add_filter;
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4
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5 local cache_size = module:get_option_number("presence_dedup_cache_size", 100);
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6
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7 -- stanza equality tests
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8 local function attr_eq(a, b)
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9 if a == b then return true; end -- unlikely but not impossible
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10 for k,v in pairs(a) do if b[k] ~= v then return false; end end
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11 for k,v in pairs(b) do if a[k] ~= v then return false; end end
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12 return true;
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13 end
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14
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15 local function st_eq(a, b)
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16 if a == b then return true; end
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17 if type(b) ~= "table" then return false; end
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18 if getmetatable(b) ~= st.stanza_mt then return false; end
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19 if a.name ~= b.name then return false; end
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20 if #a ~= #b then return false; end
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21 if not attr_eq(a.attr, b.attr) then return false; end
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22 for i = 1, #a do if not st_eq(a[i], b[i]) then return false; end end
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23 return true;
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24 end
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25
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26 local function dedup_presence(stanza, session)
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27 if session.presence_cache and session.presence
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28 and getmetatable(stanza) == st.stanza_mt and stanza.name == "presence"
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29 and stanza.attr.xmlns == nil and stanza.attr.from then
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30 local cached = session.presence_cache:get(stanza.attr.from);
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31 if st_eq(stanza, cached) then
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32 return nil;
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33 else
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34 session.presence_cache:set(stanza.attr.from, st.clone(stanza));
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35 end
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36 end
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37 return stanza;
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38 end
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39
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40 module:hook("presence/initial", function (event)
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19924a2c4a48 mod_presence_dedup: Remove unused variables [luacheck]
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parents: 2155
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41 local session = event.origin;
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42 session.presence_cache = cache.new(cache_size);
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43 add_filter(session, "stanzas/out", dedup_presence, 90);
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44 end);