prosody
890f4b2cc444
plugins/muc/history.lib.lua

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plugins/muc/history.lib.lua @ 7089:890f4b2cc444

MUC: Add luacheck annotations, remove unused vars, rename conflicting vars etc
author Kim Alvefur <zash@zash.se>
date Wed, 20 Jan 2016 15:04:42 +0100
parent 7086:6cc7c9da29ed
child 7350:24e2369b67f9
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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 module:hook("muc-config-form", function(event)
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35 table.insert(event.form, {
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36 name = "muc#roomconfig_historylength";
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37 type = "text-single";
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38 label = "Maximum Number of History Messages Returned by Room";
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39 value = tostring(get_historylength(event.room));
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40 });
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41 end);
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42
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43 module:hook("muc-config-submitted/muc#roomconfig_historylength", function(event)
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44 if set_historylength(event.room, event.value) then
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45 event.status_codes["104"] = true;
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46 end
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47 end);
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48
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49 local function parse_history(stanza)
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50 local x_tag = stanza:get_child("x", "http://jabber.org/protocol/muc");
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51 local history_tag = x_tag and x_tag:get_child("history", "http://jabber.org/protocol/muc");
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52 if not history_tag then
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53 return nil, default_history_length, nil;
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54 end
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55
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56 local maxchars = tonumber(history_tag.attr.maxchars);
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57
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58 local maxstanzas = tonumber(history_tag.attr.maxstanzas);
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59
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60 -- messages received since the UTC datetime specified
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61 local since = history_tag.attr.since;
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62 if since then
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63 since = datetime.parse(since);
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64 end
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65
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66 -- messages received in the last "X" seconds.
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67 local seconds = tonumber(history_tag.attr.seconds);
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68 if seconds then
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69 seconds = gettime() - seconds;
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70 if since then
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71 since = math.max(since, seconds);
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72 else
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73 since = seconds;
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74 end
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75 end
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76
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77 return maxchars, maxstanzas, since;
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78 end
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79
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80 module:hook("muc-get-history", function(event)
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81 local room = event.room;
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82 local history = room._data["history"]; -- send discussion history
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83 if not history then return nil end
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84 local history_len = #history;
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85
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86 local to = event.to;
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87 local maxchars = event.maxchars;
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88 local maxstanzas = event.maxstanzas or history_len;
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89 local since = event.since;
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90 local n = 0;
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91 local charcount = 0;
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92 for i=history_len,1,-1 do
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93 local entry = history[i];
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94 if maxchars then
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95 if not entry.chars then
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96 entry.stanza.attr.to = "";
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97 entry.chars = #tostring(entry.stanza);
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98 end
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99 charcount = charcount + entry.chars + #to;
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100 if charcount > maxchars then break; end
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101 end
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102 if since and since > entry.timestamp then break; end
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103 if n + 1 > maxstanzas then break; end
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104 n = n + 1;
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105 end
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106
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107 local i = history_len-n+1
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108 function event.next_stanza()
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109 if i > history_len then return nil end
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110 local entry = history[i];
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111 local msg = entry.stanza;
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112 msg.attr.to = to;
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113 i = i + 1;
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114 return msg;
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115 end
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116 return true;
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117 end);
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118
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119 local function send_history(room, stanza)
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120 local maxchars, maxstanzas, since = parse_history(stanza);
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121 local event = {
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122 room = room;
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123 to = stanza.attr.from; -- `to` is required to calculate the character count for `maxchars`
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124 maxchars = maxchars, maxstanzas = maxstanzas, since = since;
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125 next_stanza = function() end; -- events should define this iterator
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126 };
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127 module:fire_event("muc-get-history", event);
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128 for msg in event.next_stanza, event do
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129 room:route_stanza(msg);
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130 end
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131 end
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132
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133 -- Send history on join
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134 module:hook("muc-occupant-session-new", function(event)
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135 send_history(event.room, event.stanza);
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136 end, 50); -- Before subject(20)
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137
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138 -- add to history
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139 module:hook("muc-add-history", function(event)
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140 local historic = event.stanza:get_child("body");
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141 if historic then
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142 local room = event.room
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143 local history = room._data["history"];
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144 if not history then history = {}; room._data["history"] = history; end
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145 local stanza = st.clone(event.stanza);
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146 stanza.attr.to = "";
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147 local ts = gettime();
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148 local stamp = datetime.datetime(ts);
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149 stanza:tag("delay", {xmlns = "urn:xmpp:delay", from = module.host, stamp = stamp}):up(); -- XEP-0203
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150 stanza:tag("x", {xmlns = "jabber:x:delay", from = module.host, stamp = datetime.legacy()}):up(); -- XEP-0091 (deprecated)
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151 local entry = { stanza = stanza, timestamp = ts };
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152 table.insert(history, entry);
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153 while #history > get_historylength(room) do table.remove(history, 1) end
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154 end
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155 return true;
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156 end, -1);
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157
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158 -- Have a single muc-add-history event, so that plugins can mark it
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159 -- as handled without stopping other muc-broadcast-message handlers
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160 module:hook("muc-broadcast-message", function(event)
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161 module:fire_event("muc-add-history", event);
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162 end);
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163
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164 return {
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165 set_max_length = set_max_history_length;
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166 parse_history = parse_history;
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167 send = send_history;
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168 get_length = get_historylength;
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169 set_length = set_historylength;
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170 };