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annotate mod_anti_spam/trie.lib.lua @ 5859:259ffdbf8906

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mod_anti_spam: New module for spam filtering (pre-alpha)
author Matthew Wild <mwild1@gmail.com>
date Tue, 05 Mar 2024 18:26:29 +0000
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5859
259ffdbf8906 mod_anti_spam: New module for spam filtering (pre-alpha)
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1 local bit = require "prosody.util.bitcompat";
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2
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3 local trie_methods = {};
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4 local trie_mt = { __index = trie_methods };
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5
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6 local function new_node()
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7 return {};
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8 end
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9
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10 function trie_methods:set(item, value)
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11 local node = self.root;
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12 for i = 1, #item do
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13 local c = item:byte(i);
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14 if not node[c] then
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15 node[c] = new_node();
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16 end
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17 node = node[c];
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18 end
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19 node.terminal = true;
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20 node.value = value;
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21 end
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22
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23 local function _remove(node, item, i)
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24 if i > #item then
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25 if node.terminal then
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26 node.terminal = nil;
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27 node.value = nil;
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28 end
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29 if next(node) ~= nil then
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30 return node;
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31 end
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32 return nil;
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33 end
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34 local c = item:byte(i);
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35 local child = node[c];
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36 local ret;
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37 if child then
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38 ret = _remove(child, item, i+1);
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39 node[c] = ret;
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40 end
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41 if ret == nil and next(node) == nil then
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42 return nil;
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43 end
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44 return node;
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45 end
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46
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47 function trie_methods:remove(item)
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48 return _remove(self.root, item, 1);
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49 end
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50
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51 function trie_methods:get(item, partial)
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52 local value;
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53 local node = self.root;
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54 local len = #item;
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55 for i = 1, len do
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56 if partial and node.terminal then
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57 value = node.value;
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58 end
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59 local c = item:byte(i);
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60 node = node[c];
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61 if not node then
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62 return value, i - 1;
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63 end
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64 end
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65 return node.value, len;
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66 end
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67
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68 function trie_methods:add(item)
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69 return self:set(item, true);
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70 end
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71
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72 function trie_methods:contains(item, partial)
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73 return self:get(item, partial) ~= nil;
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74 end
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75
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76 function trie_methods:longest_prefix(item)
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77 return select(2, self:get(item));
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78 end
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79
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80 function trie_methods:add_subnet(item, bits)
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81 item = item.packed:sub(1, math.ceil(bits/8));
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82 local existing = self:get(item);
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83 if not existing then
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84 existing = { bits };
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85 return self:set(item, existing);
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86 end
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87
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88 -- Simple insertion sort
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89 for i = 1, #existing do
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90 local v = existing[i];
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91 if v == bits then
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92 return; -- Already in there
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93 elseif v > bits then
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94 table.insert(existing, v, i);
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95 return;
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96 end
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97 end
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98 end
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99
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100 function trie_methods:remove_subnet(item, bits)
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101 item = item.packed:sub(1, math.ceil(bits/8));
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102 local existing = self:get(item);
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103 if not existing then
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104 return;
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105 end
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106
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107 -- Simple insertion sort
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108 for i = 1, #existing do
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109 local v = existing[i];
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110 if v == bits then
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111 table.remove(existing, i);
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112 break;
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113 elseif v > bits then
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114 return; -- Stop search
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115 end
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116 end
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117
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118 if #existing == 0 then
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119 self:remove(item);
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120 end
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121 end
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122
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123 function trie_methods:has_ip(item)
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124 item = item.packed;
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125 local node = self.root;
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126 local len = #item;
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127 for i = 1, len do
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128 if node.terminal then
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129 return true;
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130 end
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131
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132 local c = item:byte(i);
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133 local child = node[c];
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134 if not child then
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135 for child_byte, child_node in pairs(node) do
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136 if type(child_byte) == "number" and child_node.terminal then
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137 local bits = child_node.value;
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138 for j = #bits, 1, -1 do
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139 local b = bits[j]-((i-1)*8);
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140 if b ~= 8 then
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141 local mask = bit.bnot(2^b-1);
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142 if bit.band(bit.bxor(c, child_byte), mask) == 0 then
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143 return true;
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144 end
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145 end
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146 end
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147 end
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148 end
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149 return false;
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150 end
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151 node = child;
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152 end
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153 end
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154
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155 local function new()
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156 return setmetatable({
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157 root = new_node();
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158 }, trie_mt);
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159 end
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160
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161 local function is_trie(o)
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162 return getmetatable(o) == trie_mt;
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163 end
259ffdbf8906 mod_anti_spam: New module for spam filtering (pre-alpha)
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164
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165 return {
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166 new = new;
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167 is_trie = is_trie;
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168 };