Mercurial > prosody-modules

annotate mod_muc_inject_mentions/mod_muc_inject_mentions.lua @ 4163:320f6d374b5d

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mod_muc_inject_mentions: Add new configuration setting to strip out prefixes from mentions
author Seve Ferrer <seve@delape.net>
date Wed, 30 Sep 2020 13:14:46 +0200
parents f7bc0e4ab4a2
children a82b0745383b
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 local st = require "util.stanza";
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5
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6 local prefixes = module:get_option("muc_inject_mentions_prefixes", nil)
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7 local suffixes = module:get_option("muc_inject_mentions_suffixes", nil)
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8 local enabled_rooms = module:get_option("muc_inject_mentions_enabled_rooms", nil)
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9 local disabled_rooms = module:get_option("muc_inject_mentions_disabled_rooms", nil)
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10 local mention_delimiters = module:get_option_set("muc_inject_mentions_mention_delimiters", {" ", "", "\n"})
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11 local append_mentions = module:get_option("muc_inject_mentions_append_mentions", false)
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12 local strip_out_prefixes = module:get_option("muc_inject_mentions_strip_out_prefixes", false)
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13
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14
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15 local reference_xmlns = "urn:xmpp:reference:0"
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16
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17 local function add_mention(mentions, bare_jid, first, last, prefix_indices, has_prefix)
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18 if strip_out_prefixes then
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19 if has_prefix then
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20 table.insert(prefix_indices, first-1)
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21 end
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22 first = first - #prefix_indices
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23 last = last - #prefix_indices
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24 end
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25 mentions[first] = {bare_jid=bare_jid, first=first, last=last}
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26 end
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27
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28 local function get_client_mentions(stanza)
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29 local has_mentions = false
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30 local client_mentions = {}
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31
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32 for element in stanza:childtags("reference", reference_xmlns) do
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33 if element.attr.type == "mention" then
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34 local key = tonumber(element.attr.begin) + 1 -- count starts at 0
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35 client_mentions[key] = {bare_jid=element.attr.uri, first=element.attr.begin, last=element.attr["end"]}
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36 has_mentions = true
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37 end
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38 end
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39
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40 return has_mentions, client_mentions
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41 end
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42
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43 local function is_room_eligible(jid)
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44 if not enabled_rooms and not disabled_rooms then
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45 return true;
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46 end
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47
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48 if enabled_rooms and not disabled_rooms then
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49 for _, _jid in ipairs(enabled_rooms) do
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50 if _jid == jid then
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51 return true
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52 end
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53 end
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54 return false
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55 end
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56
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57 if disabled_rooms and not enabled_rooms then
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58 for _, _jid in ipairs(disabled_rooms) do
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59 if _jid == jid then
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60 return false
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61 end
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62 end
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63 return true
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64 end
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65
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66 return true
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67 end
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68
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69 local function has_nick_prefix(body, first)
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70 -- There are no configured prefixes
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71 if not prefixes or #prefixes < 1 then return false end
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72
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73 -- Prefix must have a space before it,
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74 -- be the first character of the body
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75 -- or be the first character after a new line
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76 if not mention_delimiters:contains(body:sub(first - 2, first - 2)) 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 prefix = body:sub(first - 1, first - 1)
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81 for _, _prefix in ipairs(prefixes) do
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82 if prefix == _prefix 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 has_nick_suffix(body, last)
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91 -- There are no configured suffixes
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92 if not suffixes or #suffixes < 1 then return false end
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93
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94 -- Suffix must have a space after it,
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95 -- be the last character of the body
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96 -- or be the last character before a new line
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97 if not mention_delimiters:contains(body:sub(last + 2, last + 2)) then
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98 return false
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99 end
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100
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101 local suffix = body:sub(last+1, last+1)
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102 for _, _suffix in ipairs(suffixes) do
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103 if suffix == _suffix then
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104 return true
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105 end
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106 end
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107
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108 return false
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109 end
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110
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111 local function search_mentions(room, body, client_mentions)
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112 local mentions, prefix_indices = {}, {}
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113
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114 for _, occupant in pairs(room._occupants) do
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115 local nick = jid_resource(occupant.nick);
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116 -- Check for multiple mentions to the same nickname in a message
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117 -- Hey @nick remember to... Ah, also @nick please let me know if...
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118 local matches = {}
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119 local _first
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120 local _last = 0
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121 while true do
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122 -- Use plain search as nick could contain
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123 -- characters used in Lua patterns
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124 _first, _last = body:find(nick, _last + 1, true)
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125 if _first == nil then break end
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126 table.insert(matches, {first=_first, last=_last})
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127 end
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128
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129 -- Filter out intentional mentions from unintentional ones
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130 for _, match in ipairs(matches) do
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131 local bare_jid = occupant.bare_jid
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132 local first, last = match.first, match.last
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133 -- Only append new mentions in case the client already sent some
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134 if not client_mentions[first] then
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135 -- Body only contains nickname or is between spaces, new lines or at the end/start of the body
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136 if mention_delimiters:contains(body:sub(first - 1, first - 1)) and
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137 mention_delimiters:contains(body:sub(last + 1, last + 1))
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138 then
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139 add_mention(mentions, bare_jid, first, last, prefix_indices, false)
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140 else
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141 -- Check if occupant is mentioned using affixes
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142 local has_prefix = has_nick_prefix(body, first)
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143 local has_suffix = has_nick_suffix(body, last)
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144
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145 -- @nickname: ...
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146 if has_prefix and has_suffix then
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147 add_mention(mentions, bare_jid, first, last, prefix_indices, has_prefix)
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148
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149 -- @nickname ...
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150 elseif has_prefix and not has_suffix then
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151 if mention_delimiters:contains(body:sub(last + 1, last + 1)) then
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152 add_mention(mentions, bare_jid, first, last, prefix_indices, has_prefix)
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153 end
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154
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155 -- nickname: ...
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156 elseif not has_prefix and has_suffix then
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157 if mention_delimiters:contains(body:sub(first - 1, first - 1)) then
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158 add_mention(mentions, bare_jid, first, last, prefix_indices, has_prefix)
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159 end
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160 end
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161 end
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162 end
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163 end
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164 end
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165
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166 return mentions, prefix_indices
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167 end
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168
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169 local function muc_inject_mentions(event)
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170 local room, stanza = event.room, event.stanza;
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171 local body = stanza:get_child("body")
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172
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173 if not body then return; end
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174
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175 -- Inject mentions only if the room is configured for them
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176 if not is_room_eligible(room.jid) then return; end
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177
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178 -- Only act on messages that do not include mentions
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179 -- unless configuration states otherwise.
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180 local has_mentions, client_mentions = get_client_mentions(stanza)
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181 if has_mentions and not append_mentions then return; end
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182
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183 local body_text = body:get_text()
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184 local mentions, prefix_indices = search_mentions(room, body_text, client_mentions)
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185 for _, mention in pairs(mentions) do
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186 -- https://xmpp.org/extensions/xep-0372.html#usecase_mention
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187 stanza:tag(
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188 "reference", {
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189 xmlns=reference_xmlns,
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190 begin=tostring(mention.first - 1), -- count starts at 0
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191 ["end"]=tostring(mention.last - 1),
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192 type="mention",
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193 uri="xmpp:" .. mention.bare_jid,
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194 }
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195 ):up()
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196 end
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197
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198 if strip_out_prefixes then
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199 local body_without_prefixes = ""
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200 local from = 0
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201 if #prefix_indices > 0 then
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diff changeset
202 for _, prefix_index in ipairs(prefix_indices) do
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203 body_without_prefixes = body_without_prefixes .. body_text:sub(from, prefix_index-1)
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204 from = prefix_index + 1
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205 end
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206 body_without_prefixes = body_without_prefixes .. body_text:sub(from, #body_text)
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diff changeset
207
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208 -- Replace original body containing prefixes
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209 stanza:maptags(
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210 function(tag)
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211 if tag.name ~= "body" then
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212 return tag
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213 end
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214 return st.stanza("body"):text(body_without_prefixes)
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215 end
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216 )
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217 end
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218 end
4138
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219 end
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220
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221 module:hook("muc-occupant-groupchat", muc_inject_mentions)