prosody
e6fed1d80116
util/filters.lua

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util/filters.lua @ 5915:e6fed1d80116

Back out 1b0ac7950129, as SSLv3 appears to still be in moderate use on the network. Also, although obsolete, SSLv3 isn't documented to have any weaknesses that TLS 1.0 (the most common version used today) doesn't also have. Get your act together clients!
author Matthew Wild <mwild1@gmail.com>
date Tue, 12 Nov 2013 02:13:01 +0000
parent 5849:8f451d370dd4
child 5850:e8c743f4213f
child 6366:8dee696c33cc
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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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10
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11 module "filters"
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12
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13 local new_filter_hooks = {};
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14
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15 function initialize(session)
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16 if not session.filters then
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17 local filters = {};
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18 session.filters = filters;
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19
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20 function session.filter(type, data)
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21 local filter_list = filters[type];
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22 if filter_list then
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23 for i = 1, #filter_list do
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24 data = filter_list[i](data, session);
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25 if data == nil then break; end
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26 end
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27 end
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28 return data;
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29 end
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30 end
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31
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32 for i=1,#new_filter_hooks do
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33 new_filter_hooks[i](session);
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34 end
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35
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36 return session.filter;
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37 end
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38
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39 function add_filter(session, type, callback, priority)
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40 if not session.filters then
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41 initialize(session);
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42 end
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44 local filter_list = session.filters[type];
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45 if not filter_list then
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46 filter_list = {};
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47 session.filters[type] = filter_list;
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48 end
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50 priority = priority or 0;
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51
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52 local i = 0;
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53 repeat
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54 i = i + 1;
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55 until not filter_list[i] or filter_list[filter_list[i]] < priority;
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56
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57 t_insert(filter_list, i, callback);
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58 filter_list[callback] = priority;
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59 end
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60
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61 function remove_filter(session, type, callback)
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62 if not session.filters then return; end
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63 local filter_list = session.filters[type];
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64 if filter_list and filter_list[callback] then
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65 for i=1, #filter_list do
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66 if filter_list[i] == callback then
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67 t_remove(filter_list, i);
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68 filter_list[callback] = nil;
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69 return true;
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70 end
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71 end
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72 end
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73 end
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74
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75 function add_filter_hook(callback)
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76 t_insert(new_filter_hooks, callback);
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77 end
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78
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79 function remove_filter_hook(callback)
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80 for i=1,#new_filter_hooks do
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81 if new_filter_hooks[i] == callback then
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82 t_remove(new_filter_hooks, i);
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83 end
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84 end
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85 end
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86
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87 return _M;