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annotate mod_presence_dedup/mod_presence_dedup.lua @ 5425:3b30635d215c

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mod_http_oauth2: Support granting zero role-scopes It seems Very Bad that if you uncheck all roles on the consent page, you get the default scopes, which seems the opposite of what you probably intended. Currently, mod_tokenauth will do the same thing, so work is needed there too to allow issuing tokens without roles. A token without a role could be used for OIDC login, and not much else. This seems like a valuable thing to support.
author Kim Alvefur <zash@zash.se>
date Sun, 07 May 2023 19:29:15 +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);