Mercurial > prosody-modules

annotate mod_report_affiliations/traits.lib.lua @ 6237:9d88c3d9eea5

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mod_http_oauth2: Enforce the registered grant types Thus a client can limit itself to certain grant types. Not sure if this prevents any attacks, but what was the point of including this in the registration if it was not going to be enforced? This became easier to do with client_id being available earlier.
author Kim Alvefur <zash@zash.se>
date Mon, 02 Jun 2025 20:55:20 +0200
parents e905ef16efb7
children
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1 local known_traits = {};
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2
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3 local function trait_added(event)
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4 local trait = event.item;
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5 local name = trait.name;
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6 if known_traits[name] then return; end
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7
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8 known_traits[name] = trait.probabilities;
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9 end
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10
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11 local function trait_removed(event)
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12 local trait = event.item;
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13 known_traits[trait.name] = nil;
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14 end
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16 module:handle_items("account-trait", trait_added, trait_removed);
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17
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18 local function bayes_probability(prior, prob_given_true, prob_given_false)
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19 local numerator = prob_given_true * prior;
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20 local denominator = numerator + prob_given_false * (1 - prior);
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21 return numerator / denominator;
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22 end
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23
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24 local function prob_is_bad(traits, prior)
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25 prior = prior or 0.50;
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26
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27 for trait, state in pairs(traits) do
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28 local probabilities = known_traits[trait];
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29 if probabilities then
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30 if state then
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31 prior = bayes_probability(
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32 prior,
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33 probabilities.prob_bad_true,
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34 probabilities.prob_bad_false
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35 );
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36 else
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37 prior = bayes_probability(
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38 prior,
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39 1 - probabilities.prob_bad_true,
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40 1 - probabilities.prob_bad_false
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41 );
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42 end
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43 end
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44 end
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45
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46 return prior;
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47 end
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48
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49 local function get_probability_bad(username, prior)
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50 local user_traits = {};
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51 module:fire_event("get-account-traits", { username = username, host = module.host, traits = user_traits });
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52 local result = prob_is_bad(user_traits, prior);
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53 return result;
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54 end
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55
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56 return {
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57 get_probability_bad = get_probability_bad;
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58 };