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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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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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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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464 return |
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465 end |
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466 end |
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467 end |
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468 end |
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469 |
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470 module:hook("muc-add-history", archive_message_added); |
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471 |
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472 local function send_ping(event) |
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473 local user = event.user; |
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474 local user_push_services = push_store:get(user); |
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475 local push_services = event.push_services or user_push_services; |
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476 handle_notify_request(nil, user, push_services, true); |
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477 end |
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478 -- can be used by other modules to ping one or more (or all) push endpoints |
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479 module:hook("cloud-notify-ping", send_ping); |
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480 |
|
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481 module:log("info", "Module loaded"); |
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482 function module.unload() |
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483 if module.unhook then |
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484 module:unhook("account-disco-info", account_dico_info); |
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485 module:unhook("iq-set/host/"..xmlns_push..":enable", push_enable); |
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486 module:unhook("iq-set/host/"..xmlns_push..":disable", push_disable); |
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487 |
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488 module:unhook("muc-add-history", archive_message_added); |
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489 module:unhook("cloud-notify-ping", send_ping); |
|
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490 |
|
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491 for push_identifier, _ in pairs(push_errors) do |
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492 local stanza_id = hashes.sha256(push_identifier, true); |
|
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493 module:unhook("iq-error/host/"..stanza_id, handle_push_error); |
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494 module:unhook("iq-result/host/"..stanza_id, handle_push_success); |
|
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495 id2node[stanza_id] = nil; |
|
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496 end |
|
|
497 end |
|
|
498 |
|
|
499 module:log("info", "Module unloaded"); |
|
|
500 end |
