prosody
c432b7172fa3
plugins/muc/history.lib.lua

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plugins/muc/history.lib.lua @ 10815:c432b7172fa3 0.11

mod_muc_mam: Fix missing advertising of XEP-0359, fixes #1547
author Kim Alvefur <zash@zash.se>
date Fri, 08 May 2020 22:39:01 +0200
parent 10230:dd7e924c74ef
child 10355:cb9755d7a36e
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rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 -- Copyright (C) 2014 Daurnimator
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5 --
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6 -- This project is MIT/X11 licensed. Please see the
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7 -- COPYING file in the source package for more information.
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8 --
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9
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10 local gettime = os.time;
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11 local datetime = require "util.datetime";
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12 local st = require "util.stanza";
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13
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14 local default_history_length = 20;
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15 local max_history_length = module:get_option_number("max_history_messages", math.huge);
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16
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17 local function set_max_history_length(_max_history_length)
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18 max_history_length = _max_history_length or math.huge;
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19 end
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20
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21 local function get_historylength(room)
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22 return math.min(room._data.history_length or default_history_length, max_history_length);
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23 end
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24
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25 local function set_historylength(room, length)
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26 if length then
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27 length = assert(tonumber(length), "Length not a valid number");
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28 end
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29 if length == default_history_length then length = nil; end
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30 room._data.history_length = length;
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31 return true;
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32 end
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33
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34 -- Fix for clients who don't support XEP-0045 correctly
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35 -- Default number of history messages the room returns
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36 local function get_defaulthistorymessages(room)
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37 return room._data.default_history_messages or default_history_length;
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38 end
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39 local function set_defaulthistorymessages(room, number)
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40 number = math.min(tonumber(number) or default_history_length, room._data.history_length or default_history_length);
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41 if number == default_history_length then
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42 number = nil;
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43 end
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44 room._data.default_history_messages = number;
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45 end
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46
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47 module:hook("muc-config-form", function(event)
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48 table.insert(event.form, {
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49 name = "muc#roomconfig_historylength";
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50 type = "text-single";
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51 label = "Maximum number of history messages returned by room";
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52 desc = "Specify the maximum number of previous messages that should be sent to users when they join the room";
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53 value = tostring(get_historylength(event.room));
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54 });
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55 table.insert(event.form, {
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56 name = 'muc#roomconfig_defaulthistorymessages',
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57 type = 'text-single',
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58 label = 'Default number of history messages returned by room',
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59 desc = "Specify the number of previous messages sent to new users when they join the room";
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60 value = tostring(get_defaulthistorymessages(event.room))
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61 });
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62 end, 70-5);
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63
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64 module:hook("muc-config-submitted/muc#roomconfig_historylength", function(event)
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65 if set_historylength(event.room, event.value) then
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66 event.status_codes["104"] = true;
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67 end
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68 end);
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69
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70 module:hook("muc-config-submitted/muc#roomconfig_defaulthistorymessages", function(event)
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71 if set_defaulthistorymessages(event.room, event.value) then
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72 event.status_codes["104"] = true;
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73 end
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74 end);
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75
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76 local function parse_history(stanza)
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77 local x_tag = stanza:get_child("x", "http://jabber.org/protocol/muc");
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78 local history_tag = x_tag and x_tag:get_child("history", "http://jabber.org/protocol/muc");
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79 if not history_tag then
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80 return nil, nil, nil;
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81 end
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82
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83 local maxchars = tonumber(history_tag.attr.maxchars);
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84
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85 local maxstanzas = tonumber(history_tag.attr.maxstanzas);
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86
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87 -- messages received since the UTC datetime specified
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88 local since = history_tag.attr.since;
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89 if since then
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90 since = datetime.parse(since);
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91 end
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92
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93 -- messages received in the last "X" seconds.
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94 local seconds = tonumber(history_tag.attr.seconds);
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95 if seconds then
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96 seconds = gettime() - seconds;
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97 if since then
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98 since = math.max(since, seconds);
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99 else
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100 since = seconds;
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101 end
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102 end
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103
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104 return maxchars, maxstanzas, since;
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105 end
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106
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107 module:hook("muc-get-history", function(event)
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108 local room = event.room;
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109 local history = room._history; -- send discussion history
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110 if not history then return nil end
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111 local history_len = #history;
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112
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113 local to = event.to;
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114 local maxchars = event.maxchars;
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115 local maxstanzas = event.maxstanzas or history_len;
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116 local since = event.since;
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117 local n = 0;
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118 local charcount = 0;
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119 for i=history_len,1,-1 do
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120 local entry = history[i];
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121 if maxchars then
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122 if not entry.chars then
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123 entry.stanza.attr.to = "";
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124 entry.chars = #tostring(entry.stanza);
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125 end
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126 charcount = charcount + entry.chars + #to;
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127 if charcount > maxchars then break; end
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128 end
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129 if since and since > entry.timestamp then break; end
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130 if n + 1 > maxstanzas then break; end
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131 n = n + 1;
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132 end
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133
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134 local i = history_len-n+1
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135 function event.next_stanza()
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136 if i > history_len then return nil end
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137 local entry = history[i];
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138 local msg = entry.stanza;
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139 msg.attr.to = to;
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140 i = i + 1;
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141 return msg;
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142 end
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143 return true;
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144 end, -1);
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145
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146 local function send_history(room, stanza)
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147 local maxchars, maxstanzas, since = parse_history(stanza);
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148 if not(maxchars or maxstanzas or since) then
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149 maxstanzas = get_defaulthistorymessages(room);
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150 end
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151 local event = {
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152 room = room;
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153 stanza = stanza;
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154 to = stanza.attr.from; -- `to` is required to calculate the character count for `maxchars`
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155 maxchars = maxchars,
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156 maxstanzas = maxstanzas,
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157 since = since;
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158 next_stanza = function() end; -- events should define this iterator
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159 };
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160 module:fire_event("muc-get-history", event);
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161 for msg in event.next_stanza, event do
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162 room:route_stanza(msg);
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163 end
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164 end
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165
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166 -- Send history on join
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167 module:hook("muc-occupant-session-new", function(event)
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168 send_history(event.room, event.stanza);
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169 end, 50); -- Before subject(20)
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170
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171 -- add to history
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172 module:hook("muc-add-history", function(event)
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173 local room = event.room
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174 local history = room._history;
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175 if not history then history = {}; room._history = history; end
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176 local stanza = st.clone(event.stanza);
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177 stanza.attr.to = "";
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178 local ts = gettime();
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179 local stamp = datetime.datetime(ts);
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180 stanza:tag("delay", { -- XEP-0203
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181 xmlns = "urn:xmpp:delay", from = room.jid, stamp = stamp
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182 }):up();
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183 stanza:tag("x", { -- XEP-0091 (deprecated)
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184 xmlns = "jabber:x:delay", from = room.jid, stamp = datetime.legacy()
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185 }):up();
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186 local entry = { stanza = stanza, timestamp = ts };
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187 table.insert(history, entry);
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188 while #history > get_historylength(room) do table.remove(history, 1) end
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189 return true;
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190 end, -1);
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191
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192 -- Have a single muc-add-history event, so that plugins can mark it
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193 -- as handled without stopping other muc-broadcast-message handlers
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194 module:hook("muc-broadcast-message", function(event)
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195 if module:fire_event("muc-message-is-historic", event) then
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196 module:fire_event("muc-add-history", event);
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197 end
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198 end);
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199
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200 module:hook("muc-message-is-historic", function (event)
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201 return event.stanza:get_child("body");
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202 end, -1);
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203
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204 return {
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205 set_max_length = set_max_history_length;
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206 parse_history = parse_history;
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207 send = send_history;
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208 get_length = get_historylength;
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209 set_length = set_historylength;
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210 };