prosody
ba3344926e18
util/filters.lua

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util/filters.lua @ 11906:ba3344926e18

MUC: Add option to include form in registration query This was originally not done based on my interpretation of XEP-0045. Today's reading, however, revealed that it actually says the result > SHOULD contain **at least** a <username/> element (emphasis mine) I take this to mean that including a form **is** allowed (and I think this is sensible). Tigase already includes the form I believe. I've gated the new behaviour behind a (default off) option, because it hasn't been tested for compatibility with clients. My primary desire for it is in Snikket, where the clients will be tested to ensure compatibility with this. I don't anticipate that (m)any clients would break, so maybe after 0.12 we can experiment with enabling it by default and eventually remove the option.
author Matthew Wild <mwild1@gmail.com>
date Mon, 15 Nov 2021 16:11:03 +0000
parent 8555:4f0f5b49bb03
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d3f16b4c1ecb util.filters: New utility library for managing filters on an object
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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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 t_insert, t_remove = table.insert, table.remove;
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11 local _ENV = nil;
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12 -- luacheck: std none
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14 local new_filter_hooks = {};
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16 local function initialize(session)
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17 if not session.filters then
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18 local filters = {};
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19 session.filters = filters;
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20
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21 function session.filter(type, data)
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22 local filter_list = filters[type];
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23 if filter_list then
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24 for i = 1, #filter_list do
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25 data = filter_list[i](data, session);
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26 if data == nil then break; end
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27 end
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28 end
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29 return data;
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30 end
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31 end
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32
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33 for i=1,#new_filter_hooks do
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34 new_filter_hooks[i](session);
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35 end
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36
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37 return session.filter;
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38 end
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39
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40 local function add_filter(session, type, callback, priority)
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41 if not session.filters then
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42 initialize(session);
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43 end
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44
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45 local filter_list = session.filters[type];
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46 if not filter_list then
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47 filter_list = {};
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48 session.filters[type] = filter_list;
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49 elseif filter_list[callback] then
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50 return; -- Filter already added
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51 end
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52
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53 priority = priority or 0;
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54
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55 local i = 0;
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56 repeat
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57 i = i + 1;
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58 until not filter_list[i] or filter_list[filter_list[i]] < priority;
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59
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60 t_insert(filter_list, i, callback);
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61 filter_list[callback] = priority;
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62 end
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63
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64 local function remove_filter(session, type, callback)
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65 if not session.filters then return; end
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66 local filter_list = session.filters[type];
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67 if filter_list and filter_list[callback] then
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68 for i=1, #filter_list do
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69 if filter_list[i] == callback then
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70 t_remove(filter_list, i);
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71 filter_list[callback] = nil;
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72 return true;
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73 end
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74 end
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75 end
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76 end
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77
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78 local function add_filter_hook(callback)
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79 t_insert(new_filter_hooks, callback);
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80 end
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81
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82 local function remove_filter_hook(callback)
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83 for i=1,#new_filter_hooks do
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84 if new_filter_hooks[i] == callback then
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85 t_remove(new_filter_hooks, i);
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86 end
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87 end
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88 end
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89
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90 return {
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91 initialize = initialize;
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92 add_filter = add_filter;
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93 remove_filter = remove_filter;
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94 add_filter_hook = add_filter_hook;
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95 remove_filter_hook = remove_filter_hook;
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96 };