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annotate mod_muc_inject_mentions/mod_muc_inject_mentions.lua @ 4162:f7bc0e4ab4a2

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mod_muc_inject_mentions: Should not append mentions by default
author Seve Ferrer <seve@delape.net>
date Tue, 29 Sep 2020 17:14:41 +0200
parents 032e1c79d039
children 320f6d374b5d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 local append_mentions = module:get_option("muc_inject_mentions_append_mentions", false)
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12
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13 local reference_xmlns = "urn:xmpp:reference:0"
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14
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15
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16 local function get_client_mentions(stanza)
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17 local has_mentions = false
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18 local client_mentions = {}
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19
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20 for element in stanza:childtags("reference", reference_xmlns) do
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21 if element.attr.type == "mention" then
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22 local key = tonumber(element.attr.begin) + 1 -- count starts at 0
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23 client_mentions[key] = {bare_jid=element.attr.uri, first=element.attr.begin, last=element.attr["end"]}
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24 has_mentions = true
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25 end
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26 end
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27
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28 return has_mentions, client_mentions
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29 end
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30
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31 local function is_room_eligible(jid)
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32 if not enabled_rooms and not disabled_rooms then
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33 return true;
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34 end
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35
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36 if enabled_rooms and not disabled_rooms then
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37 for _, _jid in ipairs(enabled_rooms) do
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38 if _jid == jid then
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39 return true
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40 end
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41 end
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42 return false
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43 end
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44
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45 if disabled_rooms and not enabled_rooms then
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46 for _, _jid in ipairs(disabled_rooms) do
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47 if _jid == jid then
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48 return false
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49 end
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50 end
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51 return true
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52 end
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53
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54 return true
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55 end
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56
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57 local function has_nick_prefix(body, first)
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58 -- There are no configured prefixes
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59 if not prefixes or #prefixes < 1 then return false end
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60
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61 -- Preffix must have a space before it,
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62 -- be the first character of the body
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63 -- or be the first character after a new line
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64 if not mention_delimiters:contains(body:sub(first - 2, first - 2)) then
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65 return false
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66 end
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67
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68 local preffix = body:sub(first - 1, first - 1)
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69 for _, _preffix in ipairs(prefixes) do
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70 if preffix == _preffix then
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71 return true
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72 end
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73 end
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74
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75 return false
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76 end
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77
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78 local function has_nick_suffix(body, last)
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79 -- There are no configured suffixes
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80 if not suffixes or #suffixes < 1 then return false end
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81
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82 -- Suffix must have a space after it,
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83 -- be the last character of the body
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84 -- or be the last character before a new line
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85 if not mention_delimiters:contains(body:sub(last + 2, last + 2)) then
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86 return false
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87 end
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88
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89 local suffix = body:sub(last+1, last+1)
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90 for _, _suffix in ipairs(suffixes) do
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91 if suffix == _suffix then
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92 return true
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93 end
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94 end
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95
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96 return false
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97 end
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98
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99 local function search_mentions(room, body, client_mentions)
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100 local mentions = {}
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101
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102 for _, occupant in pairs(room._occupants) do
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103 local nick = jid_resource(occupant.nick);
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104 -- Check for multiple mentions to the same nickname in a message
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105 -- Hey @nick remember to... Ah, also @nick please let me know if...
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106 local matches = {}
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107 local _first
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108 local _last = 0
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109 while true do
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110 -- Use plain search as nick could contain
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111 -- characters used in Lua patterns
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112 _first, _last = body:find(nick, _last + 1, true)
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113 if _first == nil then break end
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114 table.insert(matches, {first=_first, last=_last})
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115 end
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116
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117 -- Filter out intentional mentions from unintentional ones
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118 for _, match in ipairs(matches) do
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119 local bare_jid = occupant.bare_jid
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120 local first, last = match.first, match.last
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121 -- Only append new mentions in case the client already sent some
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122 if not client_mentions[first] then
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123 -- Body only contains nickname or is between spaces, new lines or at the end/start of the body
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124 if mention_delimiters:contains(body:sub(first - 1, first - 1)) and
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125 mention_delimiters:contains(body:sub(last + 1, last + 1))
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126 then
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127 mentions[first] = {bare_jid=bare_jid, first=first, last=last}
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128 else
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129 -- Check if occupant is mentioned using affixes
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130 local has_preffix = has_nick_prefix(body, first)
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131 local has_suffix = has_nick_suffix(body, last)
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132
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133 -- @nickname: ...
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134 if has_preffix and has_suffix then
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135 mentions[first] = {bare_jid=bare_jid, first=first, last=last}
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136
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137 -- @nickname ...
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138 elseif has_preffix and not has_suffix then
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139 if mention_delimiters:contains(body:sub(last + 1, last + 1)) then
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140 mentions[first] = {bare_jid=bare_jid, first=first, last=last}
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141 end
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142
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143 -- nickname: ...
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144 elseif not has_preffix and has_suffix then
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145 if mention_delimiters:contains(body:sub(first - 1, first - 1)) then
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146 mentions[first] = {bare_jid=bare_jid, first=first, last=last}
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147 end
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148 end
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149 end
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150 end
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151 end
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152 end
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153
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154 return mentions
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155 end
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156
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157 local function muc_inject_mentions(event)
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158 local room, stanza = event.room, event.stanza;
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159 local body = stanza:get_child("body")
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160
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161 if not body then return; end
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162
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163 -- Inject mentions only if the room is configured for them
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164 if not is_room_eligible(room.jid) then return; end
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165
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166 -- Only act on messages that do not include mentions
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167 -- unless configuration states otherwise.
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168 local has_mentions, client_mentions = get_client_mentions(stanza)
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169 if has_mentions and not append_mentions then return; end
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170
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171 local mentions = search_mentions(room, body:get_text(), client_mentions)
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172 for _, mention in pairs(mentions) do
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173 -- https://xmpp.org/extensions/xep-0372.html#usecase_mention
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174 stanza:tag(
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175 "reference", {
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176 xmlns=reference_xmlns,
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177 begin=tostring(mention.first - 1), -- count starts at 0
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178 ["end"]=tostring(mention.last - 1),
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179 type="mention",
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180 uri="xmpp:" .. mention.bare_jid,
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181 }
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182 ):up()
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183 end
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184 end
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185
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186 module:hook("muc-occupant-groupchat", muc_inject_mentions)