prosody
5484debdfdfe
plugins/mod_debug_stanzas/watcher.lib.lua

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plugins/mod_debug_stanzas/watcher.lib.lua @ 12900:5484debdfdfe

mod_auth_internal_hashed: Refactor to prepare for disabling users Moving this out will make space for a dynamic check whether a particular user is disabled or not, which is one possible response to abuse of account privileges.
author Kim Alvefur <zash@zash.se>
date Wed, 22 Feb 2023 13:27:08 +0100
parent 12463:788048158982
child 12977:74b9e05af71e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 local filters = require "util.filters";
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2 local jid = require "util.jid";
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3 local set = require "util.set";
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4
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5 local client_watchers = {};
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6
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7 -- active_filters[session] = {
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8 -- filter_func = filter_func;
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9 -- downstream = { cb1, cb2, ... };
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10 -- }
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11 local active_filters = {};
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12
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13 local function subscribe_session_stanzas(session, handler, reason)
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14 if active_filters[session] then
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15 table.insert(active_filters[session].downstream, handler);
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16 if reason then
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17 handler(reason, nil, session);
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18 end
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19 return;
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20 end
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21 local downstream = { handler };
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22 active_filters[session] = {
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23 filter_in = function (stanza)
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24 module:log("debug", "NOTIFY WATCHER %d", #downstream);
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25 for i = 1, #downstream do
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26 downstream[i]("received", stanza, session);
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27 end
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28 return stanza;
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29 end;
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30 filter_out = function (stanza)
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31 module:log("debug", "NOTIFY WATCHER %d", #downstream);
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32 for i = 1, #downstream do
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33 downstream[i]("sent", stanza, session);
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34 end
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35 return stanza;
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36 end;
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37 downstream = downstream;
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38 };
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39 filters.add_filter(session, "stanzas/in", active_filters[session].filter_in);
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40 filters.add_filter(session, "stanzas/out", active_filters[session].filter_out);
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41 if reason then
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42 handler(reason, nil, session);
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43 end
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44 end
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45
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46 local function unsubscribe_session_stanzas(session, handler, reason)
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47 local active_filter = active_filters[session];
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48 if not active_filter then
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49 return;
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50 end
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51 for i = #active_filter.downstream, 1, -1 do
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52 if active_filter.downstream[i] == handler then
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53 table.remove(active_filter.downstream, i);
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54 if reason then
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55 handler(reason, nil, session);
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56 end
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57 end
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58 end
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59 if #active_filter.downstream == 0 then
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60 filters.remove_filter(session, "stanzas/in", active_filter.filter_in);
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61 filters.remove_filter(session, "stanzas/out", active_filter.filter_out);
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62 end
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63 active_filters[session] = nil;
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64 end
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65
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66 local function unsubscribe_all_from_session(session, reason)
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67 local active_filter = active_filters[session];
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68 if not active_filter then
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69 return;
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70 end
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71 for i = #active_filter.downstream, 1, -1 do
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72 local handler = table.remove(active_filter.downstream, i);
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73 if reason then
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74 handler(reason, nil, session);
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75 end
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76 end
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77 filters.remove_filter(session, "stanzas/in", active_filter.filter_in);
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78 filters.remove_filter(session, "stanzas/out", active_filter.filter_out);
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79 active_filters[session] = nil;
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80 end
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81
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82 local function unsubscribe_handler_from_all(handler, reason)
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83 for session in pairs(active_filters) do
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84 unsubscribe_session_stanzas(session, handler, reason);
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85 end
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86 end
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87
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88 local s2s_watchers = {};
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89
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90 module:hook("s2sin-established", function (event)
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91 for _, watcher in ipairs(s2s_watchers) do
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92 if watcher.target_spec == event.session.from_host then
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93 subscribe_session_stanzas(event.session, watcher.handler, "opened");
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94 end
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95 end
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96 end);
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97
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98 module:hook("s2sout-established", function (event)
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99 for _, watcher in ipairs(s2s_watchers) do
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100 if watcher.target_spec == event.session.to_host then
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101 subscribe_session_stanzas(event.session, watcher.handler, "opened");
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102 end
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103 end
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104 end);
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105
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106 module:hook("s2s-closed", function (event)
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107 unsubscribe_all_from_session(event.session, "closed");
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108 end);
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109
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110 local watched_hosts = set.new();
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111
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112 local handler_map = setmetatable({}, { __mode = "kv" });
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113
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114 local function add_stanza_watcher(spec, orig_handler)
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115 local function filtering_handler(event_type, stanza, session)
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116 if stanza and spec.filter_spec then
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117 if spec.filter_spec.with_jid then
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118 if event_type == "sent" and (not stanza.attr.from or not jid.compare(stanza.attr.from, spec.filter_spec.with_jid)) then
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119 return;
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120 elseif event_type == "received" and (not stanza.attr.to or not jid.compare(stanza.attr.to, spec.filter_spec.with_jid)) then
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121 return;
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122 end
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123 end
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124 end
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125 return orig_handler(event_type, stanza, session);
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126 end
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127 handler_map[orig_handler] = filtering_handler;
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128 if spec.target_spec.jid then
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129 local target_is_remote_host = not jid.node(spec.target_spec.jid) and not prosody.hosts[spec.target_spec.jid];
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130
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131 if target_is_remote_host then
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132 -- Watch s2s sessions
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133 table.insert(s2s_watchers, {
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134 target_spec = spec.target_spec.jid;
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135 handler = filtering_handler;
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136 orig_handler = orig_handler;
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137 });
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138
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139 -- Scan existing s2sin for matches
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140 for session in pairs(prosody.incoming_s2s) do
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141 if spec.target_spec.jid == session.from_host then
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142 subscribe_session_stanzas(session, filtering_handler, "attached");
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143 end
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144 end
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145 -- Scan existing s2sout for matches
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146 for local_host, local_session in pairs(prosody.hosts) do --luacheck: ignore 213/local_host
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147 for remote_host, remote_session in pairs(local_session.s2sout) do
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148 if spec.target_spec.jid == remote_host then
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149 subscribe_session_stanzas(remote_session, filtering_handler, "attached");
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150 end
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151 end
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152 end
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153 else
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154 table.insert(client_watchers, {
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155 target_spec = spec.target_spec.jid;
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156 handler = filtering_handler;
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157 orig_handler = orig_handler;
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158 });
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159 local host = jid.host(spec.target_spec.jid);
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160 if not watched_hosts:contains(host) and prosody.hosts[host] then
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161 module:context(host):hook("resource-bind", function (event)
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162 for _, watcher in ipairs(client_watchers) do
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163 module:log("debug", "NEW CLIENT: %s vs %s", event.session.full_jid, watcher.target_spec);
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164 if jid.compare(event.session.full_jid, watcher.target_spec) then
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165 module:log("debug", "MATCH");
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166 subscribe_session_stanzas(event.session, watcher.handler, "opened");
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167 else
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168 module:log("debug", "NO MATCH");
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169 end
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170 end
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171 end);
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172
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173 module:context(host):hook("resource-unbind", function (event)
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174 unsubscribe_all_from_session(event.session, "closed");
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175 end);
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176
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177 watched_hosts:add(host);
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178 end
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179 for full_jid, session in pairs(prosody.full_sessions) do
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180 if jid.compare(full_jid, spec.target_spec.jid) then
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181 subscribe_session_stanzas(session, filtering_handler, "attached");
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182 end
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183 end
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184 end
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185 else
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186 error("No recognized target selector");
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187 end
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188 end
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189
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190 local function remove_stanza_watcher(orig_handler)
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191 local handler = handler_map[orig_handler];
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192 unsubscribe_handler_from_all(handler, "detached");
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193 handler_map[orig_handler] = nil;
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194
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195 for i = #client_watchers, 1, -1 do
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196 if client_watchers[i].orig_handler == orig_handler then
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197 table.remove(client_watchers, i);
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198 end
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199 end
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200
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201 for i = #s2s_watchers, 1, -1 do
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202 if s2s_watchers[i].orig_handler == orig_handler then
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203 table.remove(s2s_watchers, i);
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204 end
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205 end
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parents:
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206 end
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parents:
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207
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208 local function cleanup(reason)
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209 client_watchers = {};
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210 s2s_watchers = {};
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211 for session in pairs(active_filters) do
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parents:
diff changeset
212 unsubscribe_all_from_session(session, reason or "cancelled");
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213 end
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214 end
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parents:
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215
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216 return {
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217 add = add_stanza_watcher;
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218 remove = remove_stanza_watcher;
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diff changeset
219 cleanup = cleanup;
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diff changeset
220 };