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annotate mod_report_affiliations/traits.lib.lua @ 6280:6ea80b73d8f2

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mod_http_oauth2: Only require redirect URIs when using grant types that need it In the Device flow, no redirect URI is used because the client instead receives responses by polling. It is therefore unnecessary to enforce a requirement that these include redirect URI(s).
author Kim Alvefur <zash@zash.se>
date Thu, 03 Jul 2025 15:42:42 +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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15
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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 };