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plugins/mod_blocklist.lua @ 8403:ba39d3a1d42e
certmanager: Change table representing LuaSec capabilities to match capabilities table exposed in LuaSec 0.7
author | Kim Alvefur <zash@zash.se> |
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date | Mon, 20 Nov 2017 00:25:18 +0100 |
parent | 8275:13dad833e821 |
child | 8741:0fd63ed1f647 |
rev | line source |
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1 -- Prosody IM |
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2 -- Copyright (C) 2009-2010 Matthew Wild |
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3 -- Copyright (C) 2009-2010 Waqas Hussain |
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4 -- Copyright (C) 2014-2015 Kim Alvefur |
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5 -- |
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6 -- This project is MIT/X11 licensed. Please see the |
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7 -- COPYING file in the source package for more information. |
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8 -- |
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9 -- This module implements XEP-0191: Blocking Command |
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10 -- |
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11 |
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12 local user_exists = require"core.usermanager".user_exists; |
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13 local rostermanager = require"core.rostermanager"; |
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14 local is_contact_subscribed = rostermanager.is_contact_subscribed; |
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15 local is_contact_pending_in = rostermanager.is_contact_pending_in; |
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16 local load_roster = rostermanager.load_roster; |
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17 local save_roster = rostermanager.save_roster; |
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18 local st = require"util.stanza"; |
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19 local st_error_reply = st.error_reply; |
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20 local jid_prep = require"util.jid".prep; |
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21 local jid_split = require"util.jid".split; |
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22 |
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23 local storage = module:open_store(); |
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24 local sessions = prosody.hosts[module.host].sessions; |
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25 local full_sessions = prosody.full_sessions; |
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26 |
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27 -- First level cache of blocklists by username. |
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28 -- Weak table so may randomly expire at any time. |
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29 local cache = setmetatable({}, { __mode = "v" }); |
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30 |
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31 -- Second level of caching, keeps a fixed number of items, also anchors |
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32 -- items in the above cache. |
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33 -- |
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34 -- The size of this affects how often we will need to load a blocklist from |
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35 -- disk, which we want to avoid during routing. On the other hand, we don't |
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36 -- want to use too much memory either, so this can be tuned by advanced |
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37 -- users. TODO use science to figure out a better default, 64 is just a guess. |
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38 local cache_size = module:get_option_number("blocklist_cache_size", 64); |
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39 local cache2 = require"util.cache".new(cache_size); |
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40 |
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41 local null_blocklist = {}; |
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42 |
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43 module:add_feature("urn:xmpp:blocking"); |
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44 |
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45 local function set_blocklist(username, blocklist) |
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46 local ok, err = storage:set(username, blocklist); |
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47 if not ok then |
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48 return ok, err; |
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49 end |
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50 -- Successful save, update the cache |
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51 cache2:set(username, blocklist); |
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52 cache[username] = blocklist; |
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53 return true; |
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54 end |
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55 |
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56 -- Migrates from the old mod_privacy storage |
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57 local function migrate_privacy_list(username) |
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58 local legacy_data = module:open_store("privacy"):get(username); |
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59 if not legacy_data or not legacy_data.lists or not legacy_data.default then return; end |
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60 local default_list = legacy_data.lists[legacy_data.default]; |
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61 if not default_list or not default_list.items then return; end |
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62 |
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63 local migrated_data = { [false] = { created = os.time(); migrated = "privacy" }}; |
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64 |
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65 module:log("info", "Migrating blocklist from mod_privacy storage for user '%s'", username); |
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66 for _, item in ipairs(default_list.items) do |
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67 if item.type == "jid" and item.action == "deny" then |
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68 local jid = jid_prep(item.value); |
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69 if not jid then |
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70 module:log("warn", "Invalid JID in privacy store for user '%s' not migrated: %s", username, tostring(item.value)); |
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71 else |
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72 migrated_data[jid] = true; |
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73 end |
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74 end |
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75 end |
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76 set_blocklist(username, migrated_data); |
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77 return migrated_data; |
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78 end |
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79 |
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80 local function get_blocklist(username) |
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81 local blocklist = cache2:get(username); |
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82 if not blocklist then |
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83 if not user_exists(username, module.host) then |
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84 return null_blocklist; |
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85 end |
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86 blocklist = storage:get(username); |
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87 if not blocklist then |
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88 blocklist = migrate_privacy_list(username); |
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89 end |
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90 if not blocklist then |
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91 blocklist = { [false] = { created = os.time(); }; }; |
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92 end |
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93 cache2:set(username, blocklist); |
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94 end |
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95 cache[username] = blocklist; |
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96 return blocklist; |
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97 end |
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98 |
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99 module:hook("iq-get/self/urn:xmpp:blocking:blocklist", function (event) |
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100 local origin, stanza = event.origin, event.stanza; |
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101 local username = origin.username; |
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102 local reply = st.reply(stanza):tag("blocklist", { xmlns = "urn:xmpp:blocking" }); |
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103 local blocklist = cache[username] or get_blocklist(username); |
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104 for jid in pairs(blocklist) do |
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105 if jid then |
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106 reply:tag("item", { jid = jid }):up(); |
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107 end |
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108 end |
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109 origin.interested_blocklist = true; -- Gets notified about changes |
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110 origin.send(reply); |
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111 return true; |
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112 end, -1); |
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113 |
6351 | 114 -- Add or remove some jid(s) from the blocklist |
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115 -- We want this to be atomic and not do a partial update |
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116 local function edit_blocklist(event) |
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117 local origin, stanza = event.origin, event.stanza; |
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118 local username = origin.username; |
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119 local action = stanza.tags[1]; -- "block" or "unblock" |
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120 local is_blocking = action.name == "block" or nil; -- nil if unblocking |
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121 local new = {}; -- JIDs to block depending or unblock on action |
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122 |
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123 -- XEP-0191 sayeth: |
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124 -- > When the user blocks communications with the contact, the user's |
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125 -- > server MUST send unavailable presence information to the contact (but |
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126 -- > only if the contact is allowed to receive presence notifications [...] |
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127 -- So contacts we need to do that for are added to the set below. |
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128 local send_unavailable = is_blocking and {}; |
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129 |
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130 -- Because blocking someone currently also blocks the ability to reject |
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131 -- subscription requests, we'll preemptively reject such |
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132 local remove_pending = is_blocking and {}; |
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133 |
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134 for item in action:childtags("item") do |
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135 local jid = jid_prep(item.attr.jid); |
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136 if not jid then |
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137 origin.send(st_error_reply(stanza, "modify", "jid-malformed")); |
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138 return true; |
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139 end |
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140 item.attr.jid = jid; -- echo back prepped |
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141 new[jid] = true; |
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142 if is_blocking then |
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143 if is_contact_subscribed(username, module.host, jid) then |
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144 send_unavailable[jid] = true; |
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145 elseif is_contact_pending_in(username, module.host, jid) then |
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146 remove_pending[jid] = true; |
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147 end |
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148 end |
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149 end |
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150 |
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151 if is_blocking and not next(new) then |
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152 -- <block/> element does not contain at least one <item/> child element |
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153 origin.send(st_error_reply(stanza, "modify", "bad-request")); |
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154 return true; |
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155 end |
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156 |
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157 local blocklist = cache[username] or get_blocklist(username); |
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158 |
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159 local new_blocklist = { |
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160 -- We set the [false] key to someting as a signal not to migrate privacy lists |
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161 [false] = blocklist[false] or { created = os.time(); }; |
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162 }; |
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163 if type(blocklist[false]) == "table" then |
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164 new_blocklist[false].modified = os.time(); |
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165 end |
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166 |
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167 if is_blocking or next(new) then |
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168 for jid in pairs(blocklist) do |
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169 if jid then new_blocklist[jid] = true; end |
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170 end |
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171 for jid in pairs(new) do |
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|
172 new_blocklist[jid] = is_blocking; |
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173 end |
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174 -- else empty the blocklist |
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175 end |
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|
176 |
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|
177 local ok, err = set_blocklist(username, new_blocklist); |
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178 if ok then |
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179 origin.send(st.reply(stanza)); |
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|
180 else |
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181 origin.send(st_error_reply(stanza, "wait", "internal-server-error", err)); |
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182 return true; |
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183 end |
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|
184 |
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185 if is_blocking then |
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186 for jid in pairs(send_unavailable) do |
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187 if not blocklist[jid] then |
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188 for _, session in pairs(sessions[username].sessions) do |
6495
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189 if session.presence then |
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190 module:send(st.presence({ type = "unavailable", to = jid, from = session.full_jid })); |
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191 end |
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192 end |
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193 end |
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194 end |
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195 |
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196 if next(remove_pending) then |
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197 local roster = load_roster(username, module.host); |
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198 for jid in pairs(remove_pending) do |
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199 roster[false].pending[jid] = nil; |
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200 end |
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201 save_roster(username, module.host, roster); |
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202 -- Not much we can do about save failing here |
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203 end |
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204 end |
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205 |
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|
206 local blocklist_push = st.iq({ type = "set", id = "blocklist-push" }) |
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|
207 :add_child(action); -- I am lazy |
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208 |
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|
209 for _, session in pairs(sessions[username].sessions) do |
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210 if session.interested_blocklist then |
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211 blocklist_push.attr.to = session.full_jid; |
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212 session.send(blocklist_push); |
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213 end |
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214 end |
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215 |
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216 return true; |
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217 end |
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218 |
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219 module:hook("iq-set/self/urn:xmpp:blocking:block", edit_blocklist, -1); |
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220 module:hook("iq-set/self/urn:xmpp:blocking:unblock", edit_blocklist, -1); |
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221 |
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222 -- Cache invalidation, solved! |
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223 module:hook_global("user-deleted", function (event) |
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224 if event.host == module.host then |
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225 cache2:set(event.username, nil); |
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226 cache[event.username] = nil; |
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227 end |
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228 end); |
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229 |
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230 -- Buggy clients |
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231 module:hook("iq-error/self/blocklist-push", function (event) |
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232 local origin, stanza = event.origin, event.stanza; |
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233 local _, condition, text = stanza:get_error(); |
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234 local log = (origin.log or module._log); |
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235 log("warn", "Client returned an error in response to notification from mod_%s: %s%s%s", |
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236 module.name, condition, text and ": " or "", text or ""); |
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237 return true; |
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238 end); |
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239 |
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240 local function is_blocked(user, jid) |
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241 local blocklist = cache[user] or get_blocklist(user); |
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242 if blocklist[jid] then return true; end |
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243 local node, host = jid_split(jid); |
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244 return blocklist[host] or node and blocklist[node..'@'..host]; |
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245 end |
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246 |
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247 -- Event handlers for bouncing or dropping stanzas |
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248 local function drop_stanza(event) |
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249 local stanza = event.stanza; |
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250 local attr = stanza.attr; |
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251 local to, from = attr.to, attr.from; |
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252 to = to and jid_split(to); |
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253 if to and from then |
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254 return is_blocked(to, from); |
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255 end |
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256 end |
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257 |
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258 local function bounce_stanza(event) |
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259 local origin, stanza = event.origin, event.stanza; |
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260 if drop_stanza(event) then |
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261 origin.send(st_error_reply(stanza, "cancel", "service-unavailable")); |
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262 return true; |
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263 end |
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264 end |
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265 |
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266 local function bounce_iq(event) |
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267 local type = event.stanza.attr.type; |
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268 if type == "set" or type == "get" then |
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269 return bounce_stanza(event); |
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270 end |
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271 return drop_stanza(event); -- result or error |
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272 end |
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273 |
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274 local function bounce_message(event) |
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275 local stanza = event.stanza; |
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276 local type = stanza.attr.type; |
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277 if type == "chat" or not type or type == "normal" then |
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278 if full_sessions[stanza.attr.to] then |
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279 -- See #690 |
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280 return drop_stanza(event); |
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281 end |
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282 return bounce_stanza(event); |
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283 end |
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284 return drop_stanza(event); -- drop headlines, groupchats etc |
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285 end |
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286 |
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287 local function drop_outgoing(event) |
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288 local origin, stanza = event.origin, event.stanza; |
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289 local username = origin.username or jid_split(stanza.attr.from); |
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290 if not username then return end |
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291 local to = stanza.attr.to; |
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292 if to then return is_blocked(username, to); end |
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293 -- nil 'to' means a self event, don't bock those |
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294 end |
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295 |
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296 local function bounce_outgoing(event) |
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297 local origin, stanza = event.origin, event.stanza; |
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298 local type = stanza.attr.type; |
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299 if type == "error" or stanza.name == "iq" and type == "result" then |
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300 return drop_outgoing(event); |
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301 end |
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302 if drop_outgoing(event) then |
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303 origin.send(st_error_reply(stanza, "cancel", "not-acceptable", "You have blocked this JID") |
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304 :tag("blocked", { xmlns = "urn:xmpp:blocking:errors" })); |
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305 return true; |
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306 end |
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307 end |
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308 |
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309 -- Hook all the events! |
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310 local prio_in, prio_out = 100, 100; |
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311 module:hook("presence/bare", drop_stanza, prio_in); |
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312 module:hook("presence/full", drop_stanza, prio_in); |
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313 |
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314 module:hook("message/bare", bounce_message, prio_in); |
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315 module:hook("message/full", bounce_message, prio_in); |
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316 |
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mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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317 module:hook("iq/bare", bounce_iq, prio_in); |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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318 module:hook("iq/full", bounce_iq, prio_in); |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
319 |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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320 module:hook("pre-message/bare", bounce_outgoing, prio_out); |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
321 module:hook("pre-message/full", bounce_outgoing, prio_out); |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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322 module:hook("pre-message/host", bounce_outgoing, prio_out); |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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323 |
7621
b8c03df6e8ca
mod_blocklist: Mention issue numbers
Kim Alvefur <zash@zash.se>
parents:
7620
diff
changeset
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324 -- FIXME See #575 -- We MUST bounce these, but we don't because this |
b8c03df6e8ca
mod_blocklist: Mention issue numbers
Kim Alvefur <zash@zash.se>
parents:
7620
diff
changeset
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325 -- would produce lots of error replies due to server-generated presence. |
b8c03df6e8ca
mod_blocklist: Mention issue numbers
Kim Alvefur <zash@zash.se>
parents:
7620
diff
changeset
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326 -- This will likely need changes to mod_presence |
6344
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
327 module:hook("pre-presence/bare", drop_outgoing, prio_out); |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
328 module:hook("pre-presence/full", drop_outgoing, prio_out); |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
329 module:hook("pre-presence/host", drop_outgoing, prio_out); |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
330 |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
331 module:hook("pre-iq/bare", bounce_outgoing, prio_out); |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
332 module:hook("pre-iq/full", bounce_outgoing, prio_out); |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
333 module:hook("pre-iq/host", bounce_outgoing, prio_out); |
68b5c1ed18dd
mod_blocklist: XEP-0191 implementation written for speed and independence from mod_privacy
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
334 |