Mercurial > prosody-modules

annotate mod_muc_inject_mentions/mod_muc_inject_mentions.lua @ 4158:df1e0465ff81

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mod_auth_http: Fix unfinished sentence in
author Matthew Wild <mwild1@gmail.com>
date Wed, 30 Sep 2020 13:27:27 +0100
parents 308b92b07da6
children 94e3e7753220
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
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10 local reference_xmlns = "urn:xmpp:reference:0"
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12
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13 local mention_delimiters = {" ", "", "\n"}
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14
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15 local function in_list(value, list)
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16 for _, v in ipairs(list) do
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17 if v == value then
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18 return true
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19 end
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20 end
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21 return false
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22 end
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23
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24
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25 local function is_room_eligible(jid)
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26 if not enabled_rooms and not disabled_rooms then
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27 return true;
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28 end
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29
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30 if enabled_rooms and not disabled_rooms then
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31 for _, _jid in ipairs(enabled_rooms) do
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32 if _jid == jid then
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33 return true
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34 end
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35 end
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36 return false
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37 end
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38
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39 if disabled_rooms and not enabled_rooms then
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40 for _, _jid in ipairs(disabled_rooms) do
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41 if _jid == jid then
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42 return false
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43 end
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44 end
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45 return true
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46 end
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47
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48 return true
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49 end
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50
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51 local function has_nick_prefix(body, first)
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52 -- There are no configured prefixes
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53 if not prefixes or #prefixes < 1 then return false end
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54
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55 -- Preffix must have a space before it,
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56 -- be the first character of the body
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57 -- or be the first character after a new line
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58 if not in_list(body:sub(first - 2, first - 2), mention_delimiters) then
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59 return false
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60 end
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61
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62 local preffix = body:sub(first - 1, first - 1)
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63 for _, _preffix in ipairs(prefixes) do
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64 if preffix == _preffix then
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65 return true
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66 end
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67 end
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68
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69 return false
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70 end
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71
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72 local function has_nick_suffix(body, last)
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73 -- There are no configured suffixes
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74 if not suffixes or #suffixes < 1 then return false end
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75
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76 -- Suffix must have a space after it,
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77 -- be the last character of the body
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78 -- or be the last character before a new line
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79 if not in_list(body:sub(last + 2, last + 2), mention_delimiters) then
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80 return false
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81 end
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82
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83 local suffix = body:sub(last+1, last+1)
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84 for _, _suffix in ipairs(suffixes) do
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85 if suffix == _suffix then
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86 return true
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87 end
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88 end
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89
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90 return false
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91 end
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92
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93 local function search_mentions(room, stanza)
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94 local body = stanza:get_child("body"):get_text();
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95 local mentions = {}
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96
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97 for _, occupant in pairs(room._occupants) do
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98 local nick = jid_resource(occupant.nick);
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99 -- Check for multiple mentions to the same nickname in a message
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100 -- Hey @nick remember to... Ah, also @nick please let me know if...
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101 local matches = {}
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102 local _first
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103 local _last = 0
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104 while true do
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105 -- Use plain search as nick could contain
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106 -- characters used in Lua patterns
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107 _first, _last = body:find(nick, _last + 1, true)
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108 if _first == nil then break end
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109 table.insert(matches, {first=_first, last=_last})
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110 end
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111
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112 -- Filter out intentional mentions from unintentional ones
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113 for _, match in ipairs(matches) do
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114 local bare_jid = occupant.bare_jid
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115 local first, last = match.first, match.last
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116
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117 -- Body only contains nickname or is between spaces, new lines or at the end/start of the body
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118 if in_list(body:sub(first - 1, first - 1), mention_delimiters) and
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119 in_list(body:sub(last + 1, last + 1), mention_delimiters)
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120 then
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121 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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122 else
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123 -- Check if occupant is mentioned using affixes
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124 local has_preffix = has_nick_prefix(body, first)
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125 local has_suffix = has_nick_suffix(body, last)
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126
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127 -- @nickname: ...
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128 if has_preffix and has_suffix then
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129 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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130
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131 -- @nickname ...
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132 elseif has_preffix and not has_suffix then
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133 if in_list(body:sub(last + 1, last + 1), mention_delimiters) then
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134 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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135 end
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136
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137 -- nickname: ...
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138 elseif not has_preffix and has_suffix then
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139 if in_list(body:sub(first - 1, first - 1), mention_delimiters) then
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140 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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141 end
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142 end
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143 end
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144 end
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145 end
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146
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147 return mentions
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148 end
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149
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150 local function muc_inject_mentions(event)
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151 local room, stanza = event.room, event.stanza;
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152 -- Inject mentions only if the room is configured for them
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153 if not is_room_eligible(room.jid) then return; end
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154 -- Only act on messages that do not include references.
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155 -- If references are found, it is assumed the client has mentions support
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156 if stanza:get_child("reference", reference_xmlns) then return; end
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157
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158 local mentions = search_mentions(room, stanza)
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159 for _, mention in ipairs(mentions) do
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160 -- https://xmpp.org/extensions/xep-0372.html#usecase_mention
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161 stanza:tag(
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162 "reference", {
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163 xmlns=reference_xmlns,
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164 begin=tostring(mention.first - 1), -- count starts at 0
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165 ["end"]=tostring(mention.last - 1),
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166 type="mention",
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167 uri="xmpp:" .. mention.bare_jid,
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168 }
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169 ):up()
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170 end
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171 end
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172
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173 module:hook("muc-occupant-groupchat", muc_inject_mentions)