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3319
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1 -- XEP-XXX: MUC Push Notifications
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2 -- Copyright (C) 2015-2016 Kim Alvefur
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3 -- Copyright (C) 2017-2018 Thilo Molitor
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4 --
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5 -- This file is MIT/X11 licensed.
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6
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7 local s_match = string.match;
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8 local s_sub = string.sub;
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9 local os_time = os.time;
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10 local next = next;
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11 local st = require"util.stanza";
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12 local jid = require"util.jid";
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13 local dataform = require"util.dataforms".new;
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14 local hashes = require"util.hashes";
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15
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16 local xmlns_push = "urn:xmpp:push:0";
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17
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18 -- configuration
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19 local include_body = module:get_option_boolean("push_notification_with_body", false);
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20 local include_sender = module:get_option_boolean("push_notification_with_sender", false);
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21 local max_push_errors = module:get_option_number("push_max_errors", 16);
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22 local max_push_devices = module:get_option_number("push_max_devices", 5);
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23 local dummy_body = module:get_option_string("push_notification_important_body", "New Message!");
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24
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25 local host_sessions = prosody.hosts[module.host].sessions;
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26 local push_errors = {};
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27 local id2node = {};
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28
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29 module:depends("muc");
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30
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31 -- ordered table iterator, allow to iterate on the natural order of the keys of a table,
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32 -- see http://lua-users.org/wiki/SortedIteration
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33 local function __genOrderedIndex( t )
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34 local orderedIndex = {}
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35 for key in pairs(t) do
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36 table.insert( orderedIndex, key )
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37 end
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38 -- sort in reverse order (newest one first)
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39 table.sort( orderedIndex, function(a, b)
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40 if a == nil or t[a] == nil or b == nil or t[b] == nil then return false end
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41 -- only one timestamp given, this is the newer one
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42 if t[a].timestamp ~= nil and t[b].timestamp == nil then return true end
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43 if t[a].timestamp == nil and t[b].timestamp ~= nil then return false end
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44 -- both timestamps given, sort normally
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45 if t[a].timestamp ~= nil and t[b].timestamp ~= nil then return t[a].timestamp > t[b].timestamp end
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46 return false -- normally not reached
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47 end)
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48 return orderedIndex
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49 end
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50 local function orderedNext(t, state)
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51 -- Equivalent of the next function, but returns the keys in timestamp
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52 -- order. We use a temporary ordered key table that is stored in the
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53 -- table being iterated.
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54
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55 local key = nil
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56 --print("orderedNext: state = "..tostring(state) )
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57 if state == nil then
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58 -- the first time, generate the index
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59 t.__orderedIndex = __genOrderedIndex( t )
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60 key = t.__orderedIndex[1]
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61 else
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62 -- fetch the next value
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63 for i = 1, #t.__orderedIndex do
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64 if t.__orderedIndex[i] == state then
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65 key = t.__orderedIndex[i+1]
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66 end
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67 end
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68 end
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69
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70 if key then
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71 return key, t[key]
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72 end
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73
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74 -- no more value to return, cleanup
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75 t.__orderedIndex = nil
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76 return
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77 end
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78 local function orderedPairs(t)
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79 -- Equivalent of the pairs() function on tables. Allows to iterate
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80 -- in order
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81 return orderedNext, t, nil
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82 end
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83
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84 -- small helper function to return new table with only "maximum" elements containing only the newest entries
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85 local function reduce_table(table, maximum)
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86 local count = 0;
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87 local result = {};
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88 for key, value in orderedPairs(table) do
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89 count = count + 1;
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90 if count > maximum then break end
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91 result[key] = value;
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92 end
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93 return result;
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94 end
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95
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96 -- For keeping state across reloads while caching reads
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97 local push_store = (function()
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98 local store = module:open_store();
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99 local push_services = {};
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100 local api = {};
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101 function api:get(user)
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102 if not push_services[user] then
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103 local err;
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104 push_services[user], err = store:get(user);
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105 if not push_services[user] and err then
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106 module:log("warn", "Error reading push notification storage for user '%s': %s", user, tostring(err));
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107 push_services[user] = {};
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108 return push_services[user], false;
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109 end
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110 end
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111 if not push_services[user] then push_services[user] = {} end
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112 return push_services[user], true;
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113 end
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114 function api:set(user, data)
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115 push_services[user] = reduce_table(data, max_push_devices);
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116 local ok, err = store:set(user, push_services[user]);
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117 if not ok then
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118 module:log("error", "Error writing push notification storage for user '%s': %s", user, tostring(err));
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119 return false;
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120 end
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121 return true;
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122 end
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123 function api:set_identifier(user, push_identifier, data)
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124 local services = self:get(user);
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125 services[push_identifier] = data;
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126 return self:set(user, services);
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127 end
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128 return api;
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129 end)();
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130
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131
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132 -- Forward declarations, as both functions need to reference each other
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133 local handle_push_success, handle_push_error;
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134
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135 function handle_push_error(event)
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136 local stanza = event.stanza;
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137 local error_type, condition = stanza:get_error();
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138 local node = id2node[stanza.attr.id];
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139 if node == nil then return false; end -- unknown stanza? Ignore for now!
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140 local from = stanza.attr.from;
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141 local user_push_services = push_store:get(node);
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142 local changed = false;
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143
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144 for push_identifier, _ in pairs(user_push_services) do
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145 local stanza_id = hashes.sha256(push_identifier, true);
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146 if stanza_id == stanza.attr.id then
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147 if user_push_services[push_identifier] and user_push_services[push_identifier].jid == from and error_type ~= "wait" then
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148 push_errors[push_identifier] = push_errors[push_identifier] + 1;
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149 module:log("info", "Got error of type '%s' (%s) for identifier '%s': "
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150 .."error count for this identifier is now at %s", error_type, condition, push_identifier,
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151 tostring(push_errors[push_identifier]));
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152 if push_errors[push_identifier] >= max_push_errors then
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153 module:log("warn", "Disabling push notifications for identifier '%s'", push_identifier);
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154 -- remove push settings from sessions
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155 if host_sessions[node] then
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156 for _, session in pairs(host_sessions[node].sessions) do
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157 if session.push_identifier == push_identifier then
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158 session.push_identifier = nil;
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159 session.push_settings = nil;
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160 session.first_hibernated_push = nil;
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161 end
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162 end
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163 end
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164 -- save changed global config
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165 changed = true;
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166 user_push_services[push_identifier] = nil
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167 push_errors[push_identifier] = nil;
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168 -- unhook iq handlers for this identifier (if possible)
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169 if module.unhook then
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170 module:unhook("iq-error/host/"..stanza_id, handle_push_error);
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171 module:unhook("iq-result/host/"..stanza_id, handle_push_success);
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172 id2node[stanza_id] = nil;
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173 end
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174 end
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175 elseif user_push_services[push_identifier] and user_push_services[push_identifier].jid == from and error_type == "wait" then
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176 module:log("debug", "Got error of type '%s' (%s) for identifier '%s': "
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177 .."NOT increasing error count for this identifier", error_type, condition, push_identifier);
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178 end
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179 end
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180 end
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181 if changed then
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182 push_store:set(node, user_push_services);
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183 end
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184 return true;
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185 end
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186
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187 function handle_push_success(event)
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188 local stanza = event.stanza;
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189 local node = id2node[stanza.attr.id];
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190 if node == nil then return false; end -- unknown stanza? Ignore for now!
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191 local from = stanza.attr.from;
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192 local user_push_services = push_store:get(node);
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193
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194 for push_identifier, _ in pairs(user_push_services) do
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195 if hashes.sha256(push_identifier, true) == stanza.attr.id then
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196 if user_push_services[push_identifier] and user_push_services[push_identifier].jid == from and push_errors[push_identifier] > 0 then
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197 push_errors[push_identifier] = 0;
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198 module:log("debug", "Push succeeded, error count for identifier '%s' is now at %s again", push_identifier, tostring(push_errors[push_identifier]));
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199 end
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200 end
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201 end
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202 return true;
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203 end
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204
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205 -- http://xmpp.org/extensions/xep-0357.html#disco
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206 local function account_dico_info(event)
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207 (event.reply or event.stanza):tag("feature", {var=xmlns_push}):up();
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208 end
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209 module:hook("account-disco-info", account_dico_info);
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210
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211 -- http://xmpp.org/extensions/xep-0357.html#enabling
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212 local function push_enable(event)
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213 local origin, stanza = event.origin, event.stanza;
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214 local enable = stanza.tags[1];
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215 origin.log("debug", "Attempting to enable push notifications");
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216 -- MUST contain a 'jid' attribute of the XMPP Push Service being enabled
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217 local push_jid = enable.attr.jid;
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218 -- SHOULD contain a 'node' attribute
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219 local push_node = enable.attr.node;
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220 -- CAN contain a 'include_payload' attribute
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221 local include_payload = enable.attr.include_payload;
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222 if not push_jid then
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223 origin.log("debug", "MUC Push notification enable request missing the 'jid' field");
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224 origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing jid"));
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225 return true;
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226 end
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227 local publish_options = enable:get_child("x", "jabber:x:data");
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228 if not publish_options then
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229 -- Could be intentional
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230 origin.log("debug", "No publish options in request");
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231 end
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232 local push_identifier = push_jid .. "<" .. (push_node or "");
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233 local push_service = {
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234 jid = push_jid;
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235 node = push_node;
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236 include_payload = include_payload;
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237 options = publish_options and st.preserialize(publish_options);
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238 timestamp = os_time();
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239 };
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240 local ok = push_store:set_identifier(origin.username.."@"..origin.host, push_identifier, push_service);
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241 if not ok then
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242 origin.send(st.error_reply(stanza, "wait", "internal-server-error"));
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243 else
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244 origin.push_identifier = push_identifier;
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245 origin.push_settings = push_service;
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246 origin.first_hibernated_push = nil;
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247 origin.log("info", "MUC Push notifications enabled for %s by %s (%s)",
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248 tostring(stanza.attr.to),
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249 tostring(stanza.attr.from),
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250 tostring(origin.push_identifier)
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251 );
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252 origin.send(st.reply(stanza));
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253 end
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254 return true;
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255 end
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256 module:hook("iq-set/host/"..xmlns_push..":enable", push_enable);
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257
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258
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259 -- http://xmpp.org/extensions/xep-0357.html#disabling
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260 local function push_disable(event)
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261 local origin, stanza = event.origin, event.stanza;
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262 local push_jid = stanza.tags[1].attr.jid; -- MUST include a 'jid' attribute
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263 local push_node = stanza.tags[1].attr.node; -- A 'node' attribute MAY be included
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264 if not push_jid then
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265 origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing jid"));
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266 return true;
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267 end
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268 local user_push_services = push_store:get(origin.username);
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269 for key, push_info in pairs(user_push_services) do
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270 if push_info.jid == push_jid and (not push_node or push_info.node == push_node) then
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271 origin.log("info", "Push notifications disabled (%s)", tostring(key));
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272 if origin.push_identifier == key then
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273 origin.push_identifier = nil;
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274 origin.push_settings = nil;
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275 origin.first_hibernated_push = nil;
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276 end
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277 user_push_services[key] = nil;
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278 push_errors[key] = nil;
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279 if module.unhook then
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280 module:unhook("iq-error/host/"..key, handle_push_error);
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281 module:unhook("iq-result/host/"..key, handle_push_success);
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282 id2node[key] = nil;
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283 end
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284 end
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285 end
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286 local ok = push_store:set(origin.username, user_push_services);
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287 if not ok then
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288 origin.send(st.error_reply(stanza, "wait", "internal-server-error"));
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289 else
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290 origin.send(st.reply(stanza));
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291 end
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292 return true;
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293 end
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294 module:hook("iq-set/host/"..xmlns_push..":disable", push_disable);
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295
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296 -- Patched version of util.stanza:find() that supports giving stanza names
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297 -- without their namespace, allowing for every namespace.
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298 local function find(self, path)
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299 local pos = 1;
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300 local len = #path + 1;
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301
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302 repeat
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303 local xmlns, name, text;
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304 local char = s_sub(path, pos, pos);
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305 if char == "@" then
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306 return self.attr[s_sub(path, pos + 1)];
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307 elseif char == "{" then
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308 xmlns, pos = s_match(path, "^([^}]+)}()", pos + 1);
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309 end
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310 name, text, pos = s_match(path, "^([^@/#]*)([/#]?)()", pos);
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311 name = name ~= "" and name or nil;
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312 if pos == len then
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313 if text == "#" then
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314 local child = xmlns ~= nil and self:get_child(name, xmlns) or self:child_with_name(name);
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315 return child and child:get_text() or nil;
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316 end
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317 return xmlns ~= nil and self:get_child(name, xmlns) or self:child_with_name(name);
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318 end
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319 self = xmlns ~= nil and self:get_child(name, xmlns) or self:child_with_name(name);
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320 until not self
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321 return nil;
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322 end
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323
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324 -- is this push a high priority one (this is needed for ios apps not using voip pushes)
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325 local function is_important(stanza)
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326 local st_name = stanza and stanza.name or nil;
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327 if not st_name then return false; end -- nonzas are never important here
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328 if st_name == "presence" then
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329 return false; -- same for presences
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330 elseif st_name == "message" then
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331 -- unpack carbon copies
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332 local stanza_direction = "in";
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333 local carbon;
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334 local st_type;
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335 -- support carbon copied message stanzas having an arbitrary message-namespace or no message-namespace at all
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336 if not carbon then carbon = find(stanza, "{urn:xmpp:carbons:2}/forwarded/message"); end
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337 if not carbon then carbon = find(stanza, "{urn:xmpp:carbons:1}/forwarded/message"); end
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338 stanza_direction = carbon and stanza:child_with_name("sent") and "out" or "in";
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339 if carbon then stanza = carbon; end
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340 st_type = stanza.attr.type;
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341
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342 -- headline message are always not important
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343 if st_type == "headline" then return false; end
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344
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345 -- carbon copied outgoing messages are not important
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346 if carbon and stanza_direction == "out" then return false; end
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347
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348 -- We can't check for body contents in encrypted messages, so let's treat them as important
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349 -- Some clients don't even set a body or an empty body for encrypted messages
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350
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351 -- check omemo https://xmpp.org/extensions/inbox/omemo.html
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352 if stanza:get_child("encrypted", "eu.siacs.conversations.axolotl") or stanza:get_child("encrypted", "urn:xmpp:omemo:0") then return true; end
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353
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354 -- check xep27 pgp https://xmpp.org/extensions/xep-0027.html
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355 if stanza:get_child("x", "jabber:x:encrypted") then return true; end
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356
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357 -- check xep373 pgp (OX) https://xmpp.org/extensions/xep-0373.html
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358 if stanza:get_child("openpgp", "urn:xmpp:openpgp:0") then return true; end
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359
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360 local body = stanza:get_child_text("body");
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361 if st_type == "groupchat" and stanza:get_child_text("subject") then return false; end -- groupchat subjects are not important here
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362 return body ~= nil and body ~= ""; -- empty bodies are not important
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363 end
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364 return false; -- this stanza wasn't one of the above cases --> it is not important, too
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365 end
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366
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367 local push_form = dataform {
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368 { name = "FORM_TYPE"; type = "hidden"; value = "urn:xmpp:push:summary"; };
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369 { name = "message-count"; type = "text-single"; };
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370 { name = "pending-subscription-count"; type = "text-single"; };
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371 { name = "last-message-sender"; type = "jid-single"; };
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372 { name = "last-message-body"; type = "text-single"; };
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373 };
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374
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375 -- http://xmpp.org/extensions/xep-0357.html#publishing
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376 local function handle_notify_request(stanza, node, user_push_services, log_push_decline)
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377 local pushes = 0;
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378 if not user_push_services or next(user_push_services) == nil then return pushes end
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379
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380 -- XXX: customized
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381 local body = stanza:get_child_text("body");
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382 if not body then
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383 return pushes;
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384 end
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385
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386 for push_identifier, push_info in pairs(user_push_services) do
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387 local send_push = true; -- only send push to this node when not already done for this stanza or if no stanza is given at all
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388 if stanza then
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389 if not stanza._push_notify then stanza._push_notify = {}; end
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390 if stanza._push_notify[push_identifier] then
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391 if log_push_decline then
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392 module:log("debug", "Already sent push notification for %s@%s to %s (%s)", node, module.host, push_info.jid, tostring(push_info.node));
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393 end
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394 send_push = false;
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395 end
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396 stanza._push_notify[push_identifier] = true;
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397 end
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398
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399 if send_push then
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400 -- construct push stanza
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401 local stanza_id = hashes.sha256(push_identifier, true);
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402 local push_publish = st.iq({ to = push_info.jid, from = module.host, type = "set", id = stanza_id })
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403 :tag("pubsub", { xmlns = "http://jabber.org/protocol/pubsub" })
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404 :tag("publish", { node = push_info.node })
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405 :tag("item")
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406 :tag("notification", { xmlns = xmlns_push });
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407 local form_data = {
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408 -- hardcode to 1 because other numbers are just meaningless (the XEP does not specify *what exactly* to count)
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409 ["message-count"] = "1";
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410 };
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411 if stanza and include_sender then
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412 form_data["last-message-sender"] = stanza.attr.from;
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413 end
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414 if stanza and include_body then
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415 form_data["last-message-body"] = stanza:get_child_text("body");
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416 elseif stanza and dummy_body and is_important(stanza) then
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417 form_data["last-message-body"] = tostring(dummy_body);
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418 end
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419 push_publish:add_child(push_form:form(form_data));
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420 push_publish:up(); -- / notification
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421 push_publish:up(); -- / publish
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422 push_publish:up(); -- / pubsub
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423 if push_info.options then
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424 push_publish:tag("publish-options"):add_child(st.deserialize(push_info.options));
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425 end
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426 -- send out push
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427 module:log("debug", "Sending%s push notification for %s@%s to %s (%s)", form_data["last-message-body"] and " important" or "", node, module.host, push_info.jid, tostring(push_info.node));
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428 -- module:log("debug", "PUSH STANZA: %s", tostring(push_publish));
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429 -- handle push errors for this node
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430 if push_errors[push_identifier] == nil then
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431 push_errors[push_identifier] = 0;
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432 module:hook("iq-error/host/"..stanza_id, handle_push_error);
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433 module:hook("iq-result/host/"..stanza_id, handle_push_success);
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434 id2node[stanza_id] = node;
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435 end
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436 module:send(push_publish);
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437 pushes = pushes + 1;
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438 end
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439 end
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440 return pushes;
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441 end
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442
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443
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444 -- archive message added
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445 local function archive_message_added(event)
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446 -- event is: { origin = origin, stanza = stanza, for_user = store_user, id = id }
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447 -- only notify for new mam messages when at least one device is online
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448 local room = event.room;
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449 local stanza = event.stanza;
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450 local body = stanza:get_child_text('body');
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451
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452 for reference in stanza:childtags("reference", "urn:xmpp:reference:0") do
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453 if reference.attr['type'] == 'mention' and reference.attr['begin'] and reference.attr['end'] then
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454 local nick = body:sub(tonumber(reference.attr['begin'])+1, tonumber(reference.attr['end']));
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455 local jid = room:get_registered_jid(nick);
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456
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457 if room._occupants[room.jid..'/'..nick] then
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458 -- We only notify for members not currently in the room
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|
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459 module:log("debug", "Not notifying %s, because he's currently in the room", jid);
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460 else
|
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461 -- We only need to notify once, even when there are multiple mentions.
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|
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462 local user_push_services = push_store:get(jid);
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|
|
463 handle_notify_request(event.stanza, jid, user_push_services, true);
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|
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464 return
|
|
|
465 end
|
|
|
466 end
|
|
|
467 end
|
|
|
468 end
|
|
|
469
|
|
|
470 module:hook("muc-add-history", archive_message_added);
|
|
|
471
|
|
|
472 local function send_ping(event)
|
|
|
473 local user = event.user;
|
|
|
474 local user_push_services = push_store:get(user);
|
|
|
475 local push_services = event.push_services or user_push_services;
|
|
|
476 handle_notify_request(nil, user, push_services, true);
|
|
|
477 end
|
|
|
478 -- can be used by other modules to ping one or more (or all) push endpoints
|
|
|
479 module:hook("cloud-notify-ping", send_ping);
|
|
|
480
|
|
|
481 module:log("info", "Module loaded");
|
|
|
482 function module.unload()
|
|
|
483 if module.unhook then
|
|
|
484 module:unhook("account-disco-info", account_dico_info);
|
|
|
485 module:unhook("iq-set/host/"..xmlns_push..":enable", push_enable);
|
|
|
486 module:unhook("iq-set/host/"..xmlns_push..":disable", push_disable);
|
|
|
487
|
|
|
488 module:unhook("muc-add-history", archive_message_added);
|
|
|
489 module:unhook("cloud-notify-ping", send_ping);
|
|
|
490
|
|
|
491 for push_identifier, _ in pairs(push_errors) do
|
|
|
492 local stanza_id = hashes.sha256(push_identifier, true);
|
|
|
493 module:unhook("iq-error/host/"..stanza_id, handle_push_error);
|
|
|
494 module:unhook("iq-result/host/"..stanza_id, handle_push_success);
|
|
|
495 id2node[stanza_id] = nil;
|
|
|
496 end
|
|
|
497 end
|
|
|
498
|
|
|
499 module:log("info", "Module unloaded");
|
|
|
500 end
|
