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annotate mod_muc_inject_mentions/mod_muc_inject_mentions.lua @ 4141:aef6f5b9f6fd

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mod_muc_inject_mentions: (W311) value assigned to variable _first is overwritten on line 104 before use
author Seve Ferrer <seve@delape.net>
date Sun, 20 Sep 2020 13:45:32 +0200
parents fea4a4831e10
children 6906562af2ee
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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11
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12 local function is_room_eligible(jid)
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13 if not enabled_rooms and not disabled_rooms then
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14 return true;
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15 end
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16
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17 if enabled_rooms and not disabled_rooms then
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18 for _, _jid in ipairs(enabled_rooms) do
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19 if _jid == jid then
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20 return true
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21 end
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22 end
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23 return false
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24 end
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25
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26 if disabled_rooms and not enabled_rooms then
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27 for _, _jid in ipairs(disabled_rooms) do
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28 if _jid == jid then
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29 return false
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30 end
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31 end
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32 return true
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33 end
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34
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35 return true
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36 end
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37
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38 local function has_nick_prefix(body, first)
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39 -- There is no prefix
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40 -- but mention could still be valid
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41 if first == 1 then return true end
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42
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43 -- There are no configured prefixes
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44 if not prefixes or #prefixes < 1 then return false end
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45
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46 -- Preffix must have a space before it
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47 -- or be the first character of the body
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48 if body:sub(first - 2, first - 2) ~= "" and
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49 body:sub(first - 2, first - 2) ~= " "
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50 then
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51 return false
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52 end
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53
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54 local preffix = body:sub(first - 1, first - 1)
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55 for _, _preffix in ipairs(prefixes) do
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56 if preffix == _preffix then
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57 return true
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58 end
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59 end
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60
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61 return false
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62 end
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63
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64 local function has_nick_suffix(body, last)
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65 -- There is no suffix
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66 -- but mention could still be valid
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67 if last == #body then return true end
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68
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69 -- There are no configured suffixes
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70 if not suffixes or #suffixes < 1 then return false end
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71
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72 -- Suffix must have a space after it
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73 -- or be the last character of the body
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74 if body:sub(last + 2, last + 2) ~= "" and
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75 body:sub(last + 2, last + 2) ~= " "
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76 then
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77 return false
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78 end
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79
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80 local suffix = body:sub(last+1, last+1)
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81 for _, _suffix in ipairs(suffixes) do
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82 if suffix == _suffix then
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83 return true
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84 end
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85 end
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86
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87 return false
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88 end
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89
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90 local function search_mentions(room, stanza)
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91 local body = stanza:get_child("body"):get_text();
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92 local mentions = {}
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93
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94 for _, occupant in pairs(room._occupants) do
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95 local nick = jid_resource(occupant.nick);
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96 -- Check for multiple mentions to the same nickname in a message
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97 -- Hey @nick remember to... Ah, also @nick please let me know if...
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98 local matches = {}
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99 local _first
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100 local _last = 0
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101 while true do
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102 -- Use plain search as nick could contain
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103 -- characters used in Lua patterns
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104 _first, _last = body:find(nick, _last + 1, true)
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105 if _first == nil then break end
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106 table.insert(matches, {first=_first, last=_last})
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107 end
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108
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109 -- Filter out intentional mentions from unintentional ones
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110 for _, match in ipairs(matches) do
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111 local bare_jid = occupant.bare_jid
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112 local first, last = match.first, match.last
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113
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114 -- Body only contains nickname
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115 if first == 1 and last == #body then
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116 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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117
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118 -- Nickname between spaces
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119 elseif body:sub(first - 1, first - 1) == " " and
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120 body:sub(last + 1, last + 1) == " "
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121 then
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122 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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123 else
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124 -- Check if occupant is mentioned using affixes
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125 local has_preffix = has_nick_prefix(body, first)
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126 local has_suffix = has_nick_suffix(body, last)
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127
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128 -- @nickname: ...
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129 if has_preffix and has_suffix then
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130 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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131
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132 -- @nickname ...
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133 elseif has_preffix and not has_suffix then
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134 if body:sub(last + 1, last + 1) == " " then
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135 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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136 end
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137
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138 -- nickname: ...
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139 elseif not has_preffix and has_suffix then
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140 if body:sub(first - 1, first - 1) == " " then
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141 table.insert(mentions, {bare_jid=bare_jid, first=first, last=last})
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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 end
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147
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148 return mentions
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149 end
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150
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151 local function muc_inject_mentions(event)
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152 local room, stanza = event.room, event.stanza;
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153 -- Inject mentions only if the room is configured for them
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154 if not is_room_eligible(room.jid) then return; end
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155 -- Only act on messages that do not include references.
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156 -- If references are found, it is assumed the client has mentions support
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157 if stanza:get_child("reference", reference_xmlns) then return; end
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158
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159 local mentions = search_mentions(room, stanza)
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160 for _, mention in ipairs(mentions) do
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161 -- https://xmpp.org/extensions/xep-0372.html#usecase_mention
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162 stanza:tag(
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163 "reference", {
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164 xmlns=reference_xmlns,
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165 begin=tostring(mention.first - 1), -- count starts at 0
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166 ["end"]=tostring(mention.last - 1),
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167 type="mention",
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168 uri="xmpp:" .. mention.bare_jid,
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169 }
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170 ):up()
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171 end
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172 end
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173
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174 module:hook("muc-occupant-groupchat", muc_inject_mentions)