prosody-modules
94e3e7753220
mod_muc_inject_mentions/mod_muc_inject_mentions.lua

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mod_muc_inject_mentions/mod_muc_inject_mentions.lua @ 4159:94e3e7753220

mod_muc_inject_mentions: Improve mentions lookup by using a set instead of a list
author Seve Ferrer <seve@delape.net>
date Mon, 28 Sep 2020 18:46:33 +0200
parent 4155:308b92b07da6
child 4161:032e1c79d039
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 module:depends("muc");
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2
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3 local jid_resource = require "util.jid".resource;
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4
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5 local prefixes = module:get_option("muc_inject_mentions_prefixes", nil)
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6 local suffixes = module:get_option("muc_inject_mentions_suffixes", nil)
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7 local enabled_rooms = module:get_option("muc_inject_mentions_enabled_rooms", nil)
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8 local disabled_rooms = module:get_option("muc_inject_mentions_disabled_rooms", nil)
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9 local mention_delimiters = module:get_option_set("muc_inject_mentions_mention_delimiters", {" ", "", "\n"})
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10
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11
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12 local reference_xmlns = "urn:xmpp:reference:0"
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13
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14 local function is_room_eligible(jid)
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15 if not enabled_rooms and not disabled_rooms then
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16 return true;
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17 end
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18
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19 if enabled_rooms and not disabled_rooms then
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20 for _, _jid in ipairs(enabled_rooms) do
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21 if _jid == jid then
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22 return true
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23 end
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24 end
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25 return false
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26 end
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27
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28 if disabled_rooms and not enabled_rooms then
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29 for _, _jid in ipairs(disabled_rooms) do
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30 if _jid == jid then
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31 return false
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32 end
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33 end
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34 return true
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35 end
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36
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37 return true
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38 end
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39
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40 local function has_nick_prefix(body, first)
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41 -- There are no configured prefixes
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42 if not prefixes or #prefixes < 1 then return false end
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43
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44 -- Preffix must have a space before it,
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45 -- be the first character of the body
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46 -- or be the first character after a new line
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47 if not mention_delimiters:contains(body:sub(first - 2, first - 2)) then
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48 return false
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49 end
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50
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51 local preffix = body:sub(first - 1, first - 1)
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52 for _, _preffix in ipairs(prefixes) do
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53 if preffix == _preffix then
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54 return true
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55 end
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56 end
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57
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58 return false
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59 end
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60
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61 local function has_nick_suffix(body, last)
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62 -- There are no configured suffixes
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63 if not suffixes or #suffixes < 1 then return false end
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64
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65 -- Suffix must have a space after it,
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66 -- be the last character of the body
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67 -- or be the last character before a new line
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68 if not mention_delimiters:contains(body:sub(last + 2, last + 2)) then
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69 return false
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70 end
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71
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72 local suffix = body:sub(last+1, last+1)
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73 for _, _suffix in ipairs(suffixes) do
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74 if suffix == _suffix then
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75 return true
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76 end
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77 end
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78
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79 return false
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80 end
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81
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82 local function search_mentions(room, stanza)
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83 local body = stanza:get_child("body"):get_text();
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84 local mentions = {}
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85
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86 for _, occupant in pairs(room._occupants) do
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87 local nick = jid_resource(occupant.nick);
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88 -- Check for multiple mentions to the same nickname in a message
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89 -- Hey @nick remember to... Ah, also @nick please let me know if...
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90 local matches = {}
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91 local _first
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92 local _last = 0
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93 while true do
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94 -- Use plain search as nick could contain
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95 -- characters used in Lua patterns
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96 _first, _last = body:find(nick, _last + 1, true)
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97 if _first == nil then break end
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98 table.insert(matches, {first=_first, last=_last})
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99 end
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100
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101 -- Filter out intentional mentions from unintentional ones
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102 for _, match in ipairs(matches) do
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103 local bare_jid = occupant.bare_jid
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104 local first, last = match.first, match.last
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105
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106 -- Body only contains nickname or is between spaces, new lines or at the end/start of the body
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107 if mention_delimiters:contains(body:sub(first - 1, first - 1)) and
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108 mention_delimiters:contains(body:sub(last + 1, last + 1))
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109 then
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110 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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111 else
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112 -- Check if occupant is mentioned using affixes
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113 local has_preffix = has_nick_prefix(body, first)
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114 local has_suffix = has_nick_suffix(body, last)
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115
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116 -- @nickname: ...
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117 if has_preffix and has_suffix then
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118 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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119
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120 -- @nickname ...
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121 elseif has_preffix and not has_suffix then
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122 if mention_delimiters:contains(body:sub(last + 1, last + 1)) then
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123 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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124 end
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125
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126 -- nickname: ...
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127 elseif not has_preffix and has_suffix then
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128 if mention_delimiters:contains(body:sub(first - 1, first - 1)) then
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129 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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130 end
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131 end
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132 end
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133 end
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134 end
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135
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136 return mentions
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137 end
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138
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139 local function muc_inject_mentions(event)
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140 local room, stanza = event.room, event.stanza;
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141 -- Inject mentions only if the room is configured for them
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142 if not is_room_eligible(room.jid) then return; end
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143 -- Only act on messages that do not include references.
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144 -- If references are found, it is assumed the client has mentions support
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145 if stanza:get_child("reference", reference_xmlns) then return; end
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146
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147 local mentions = search_mentions(room, stanza)
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148 for _, mention in ipairs(mentions) do
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149 -- https://xmpp.org/extensions/xep-0372.html#usecase_mention
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150 stanza:tag(
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151 "reference", {
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152 xmlns=reference_xmlns,
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153 begin=tostring(mention.first - 1), -- count starts at 0
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154 ["end"]=tostring(mention.last - 1),
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155 type="mention",
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156 uri="xmpp:" .. mention.bare_jid,
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157 }
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158 ):up()
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159 end
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160 end
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161
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162 module:hook("muc-occupant-groupchat", muc_inject_mentions)