prosody
50324f66ca2a
plugins/muc/history.lib.lua

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plugins/muc/history.lib.lua @ 13213:50324f66ca2a

plugins: Use integer config API with interval specification where sensible Many of these fall into a few categories: - util.cache size, must be >= 1 - byte or item counts that logically can't be negative - port numbers that should be in 1..0xffff
author Kim Alvefur <zash@zash.se>
date Mon, 17 Jul 2023 01:38:54 +0200
parent 12977:74b9e05af71e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 "prosody.util.datetime";
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12 local st = require "prosody.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_integer("max_history_messages", math.huge, 0);
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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 datatype = "xs:integer";
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52 label = "Maximum number of history messages returned by room";
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53 desc = "Specify the maximum number of previous messages that should be sent to users when they join the room";
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54 value = get_historylength(event.room);
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55 });
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56 table.insert(event.form, {
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57 name = 'muc#roomconfig_defaulthistorymessages',
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58 type = 'text-single',
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59 datatype = "xs:integer";
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60 label = 'Default number of history messages returned by room',
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61 desc = "Specify the number of previous messages sent to new users when they join the room";
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62 value = get_defaulthistorymessages(event.room);
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63 });
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64 end, 70-5);
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65
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66 module:hook("muc-config-submitted/muc#roomconfig_historylength", function(event)
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67 if set_historylength(event.room, event.value) then
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68 event.status_codes["104"] = true;
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69 end
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70 end);
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71
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72 module:hook("muc-config-submitted/muc#roomconfig_defaulthistorymessages", function(event)
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73 if set_defaulthistorymessages(event.room, event.value) then
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74 event.status_codes["104"] = true;
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75 end
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76 end);
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77
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78 local function parse_history(stanza)
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79 local x_tag = stanza:get_child("x", "http://jabber.org/protocol/muc");
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80 local history_tag = x_tag and x_tag:get_child("history", "http://jabber.org/protocol/muc");
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81 if not history_tag then
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82 return nil, nil, nil;
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83 end
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84
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85 local maxchars = tonumber(history_tag.attr.maxchars);
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86
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87 local maxstanzas = tonumber(history_tag.attr.maxstanzas);
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88
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89 -- messages received since the UTC datetime specified
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90 local since = history_tag.attr.since;
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91 if since then
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92 since = datetime.parse(since);
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93 end
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94
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95 -- messages received in the last "X" seconds.
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96 local seconds = tonumber(history_tag.attr.seconds);
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97 if seconds then
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98 seconds = gettime() - seconds;
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99 if since then
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100 since = math.max(since, seconds);
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101 else
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102 since = seconds;
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103 end
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104 end
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105
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106 return maxchars, maxstanzas, since;
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107 end
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108
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109 module:hook("muc-get-history", function(event)
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110 local room = event.room;
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111 local history = room._history; -- send discussion history
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112 if not history then return nil end
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113 local history_len = #history;
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114
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115 local to = event.to;
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116 local maxchars = event.maxchars;
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117 local maxstanzas = event.maxstanzas or history_len;
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118 local since = event.since;
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119 local n = 0;
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120 local charcount = 0;
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121 for i=history_len,1,-1 do
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122 local entry = history[i];
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123 if maxchars then
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124 if not entry.chars then
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125 entry.stanza.attr.to = "";
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126 entry.chars = #tostring(entry.stanza);
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127 end
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128 charcount = charcount + entry.chars + #to;
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129 if charcount > maxchars then break; end
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130 end
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131 if since and since > entry.timestamp then break; end
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132 if n + 1 > maxstanzas then break; end
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133 n = n + 1;
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134 end
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135
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136 local i = history_len-n+1
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137 function event.next_stanza()
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138 if i > history_len then return nil end
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139 local entry = history[i];
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140 local msg = entry.stanza;
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141 msg.attr.to = to;
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142 i = i + 1;
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143 return msg;
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144 end
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145 return true;
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146 end, -1);
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147
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148 local function send_history(room, stanza)
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149 local maxchars, maxstanzas, since = parse_history(stanza);
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150 if not(maxchars or maxstanzas or since) then
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151 maxstanzas = get_defaulthistorymessages(room);
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152 end
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153 local event = {
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154 room = room;
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155 stanza = stanza;
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156 to = stanza.attr.from; -- `to` is required to calculate the character count for `maxchars`
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157 maxchars = maxchars,
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158 maxstanzas = maxstanzas,
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159 since = since;
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160 next_stanza = function() end; -- events should define this iterator
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161 };
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162 module:fire_event("muc-get-history", event);
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163 for msg in event.next_stanza, event do
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164 room:route_stanza(msg);
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165 end
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166 end
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167
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168 -- Send history on join
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169 module:hook("muc-occupant-session-new", function(event)
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170 send_history(event.room, event.stanza);
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171 end, 50); -- Before subject(20)
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172
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173 -- add to history
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174 module:hook("muc-add-history", function(event)
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175 local room = event.room
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176 if get_historylength(room) == 0 then
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177 room._history = nil;
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178 return;
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179 end
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180 local history = room._history;
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181 if not history then history = {}; room._history = history; end
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182 local stanza = st.clone(event.stanza);
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183 stanza.attr.to = "";
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184 local ts = gettime();
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185 local stamp = datetime.datetime(ts);
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186 stanza:tag("delay", { -- XEP-0203
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187 xmlns = "urn:xmpp:delay", from = room.jid, stamp = stamp
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188 }):up();
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189 local entry = { stanza = stanza, timestamp = ts };
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190 table.insert(history, entry);
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191 while #history > get_historylength(room) do table.remove(history, 1) end
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192 return true;
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193 end, -1);
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194
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195 -- Have a single muc-add-history event, so that plugins can mark it
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196 -- as handled without stopping other muc-broadcast-message handlers
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197 module:hook("muc-broadcast-message", function(event)
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198 if module:fire_event("muc-message-is-historic", event) then
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199 module:fire_event("muc-add-history", event);
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200 end
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201 end);
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202
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203 module:hook("muc-message-is-historic", function (event)
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204 local stanza = event.stanza;
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205 if stanza:get_child("no-store", "urn:xmpp:hints")
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206 or stanza:get_child("no-permanent-store", "urn:xmpp:hints") then
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207 -- XXX Experimental XEP
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208 return false, "hint";
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209 end
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210 if stanza:get_child("store", "urn:xmpp:hints") then
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211 return true, "hint";
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212 end
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213 if stanza:get_child("body") then
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214 return true;
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215 end
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216 if stanza:get_child("encryption", "urn:xmpp:eme:0") then
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217 -- Since we can't know what an encrypted message contains, we assume it's important
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218 -- XXX Experimental XEP
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219 return true, "encrypted";
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220 end
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221 if stanza:get_child(nil, "urn:xmpp:chat-markers:0") then
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222 -- XXX Experimental XEP
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223 return true, "marker";
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224 end
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225 end, -1);
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226
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227 return {
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228 set_max_length = set_max_history_length;
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229 parse_history = parse_history;
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230 send = send_history;
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231 get_length = get_historylength;
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232 set_length = set_historylength;
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diff changeset
233 };