prosody
638f627e707f
plugins/mod_mimicking.lua

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plugins/mod_mimicking.lua @ 13134:638f627e707f

util.datamanager: Add O(1) list indexing with on-disk index Index file contains offsets and lengths of each item() which allows seeking directly to each item and reading it without parsing the entire file. Also allows tricks like binary search, assuming items have some defined order. We take advantage of the 1-based indexing in tables to store a magic header in the 0 position, so that table index 1 ends up at file index 1.
author Kim Alvefur <zash@zash.se>
date Tue, 11 May 2021 02:09:56 +0200
parent 12977:74b9e05af71e
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1 -- Prosody IM
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2 -- Copyright (C) 2012 Florian Zeitz
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3 -- Copyright (C) 2019 Kim Alvefur
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local encodings = require "prosody.util.encodings";
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10 assert(encodings.confusable, "This module requires that Prosody be built with ICU");
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11 local skeleton = encodings.confusable.skeleton;
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12
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13 local usage = require "prosody.util.prosodyctl".show_usage;
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14 local usermanager = require "prosody.core.usermanager";
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15 local storagemanager = require "prosody.core.storagemanager";
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16
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17 local skeletons
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18 function module.load()
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19 if module.host ~= "*" then
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20 skeletons = module:open_store("skeletons");
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21 end
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22 end
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23
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24 module:hook("user-registered", function(user)
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25 local skel = skeleton(user.username);
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26 local ok, err = skeletons:set(skel, { username = user.username });
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27 if not ok then
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28 module:log("error", "Unable to store mimicry data (%q => %q): %s", user.username, skel, err);
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29 end
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30 end);
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31
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32 module:hook_global("user-deleted", function(user)
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33 if user.host ~= module.host then return end
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34 local skel = skeleton(user.username);
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35 local ok, err = skeletons:set(skel, nil);
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36 if not ok and err then
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37 module:log("error", "Unable to clear mimicry data (%q): %s", skel, err);
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38 end
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39 end);
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40
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41 module:hook("user-registering", function(user)
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42 local existing, err = skeletons:get(skeleton(user.username));
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43 if existing then
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44 module:log("debug", "Attempt to register username '%s' which could be confused with '%s'", user.username, existing.username);
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45 user.allowed = false;
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46 elseif err then
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47 module:log("error", "Unable to check if new username '%s' can be confused with any existing user: %s", err);
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48 end
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49 end);
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50
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51 function module.command(arg)
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52 if (arg[1] ~= "bootstrap" or not arg[2]) then
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53 usage("mod_mimicking bootstrap <host>", "Initialize username mimicry database");
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54 return;
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55 end
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56
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57 local host = arg[2];
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58
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59 local host_session = prosody.hosts[host];
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60 if not host_session then
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61 return "No such host";
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62 end
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63
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64 storagemanager.initialize_host(host);
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65 usermanager.initialize_host(host);
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66
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67 skeletons = storagemanager.open(host, "skeletons");
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68
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69 local count = 0;
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70 for user in usermanager.users(host) do
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71 local skel = skeleton(user);
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72 local existing, err = skeletons:get(skel);
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73 if existing and existing.username ~= user then
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74 module:log("warn", "Existing usernames '%s' and '%s' are confusable", existing.username, user);
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75 elseif err then
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76 module:log("error", "Error checking for existing mimicry data (%q = %q): %s", user, skel, err);
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77 end
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78 local ok, err = skeletons:set(skel, { username = user });
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79 if ok then
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80 count = count + 1;
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81 elseif err then
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82 module:log("error", "Unable to store mimicry data (%q => %q): %s", user, skel, err);
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83 end
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84 end
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85 module:log("info", "%d usernames indexed", count);
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86 end