Mercurial > prosody-modules
annotate mod_presence_dedup/mod_presence_dedup.lua @ 5424:b45d9a81b3da
mod_http_oauth2: Revert role selector, going to try something else
Back out f2c7bb3af600
Allowing only a single role to be encoded into the grant takes away the
possibility of having multiple roles in the grant, one of which is
selected when issuing an access token. It also takes away the ability to
have zero roles granted, which could be useful e.g. when you only need
OIDC scopes.
author | Kim Alvefur <zash@zash.se> |
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date | Sun, 07 May 2023 19:40:57 +0200 |
parents | 19924a2c4a48 |
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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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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); |