prosody
0fee75871f78
plugins/mod_tombstones.lua

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plugins/mod_tombstones.lua @ 12188:0fee75871f78

mod_storage_xep0227: be defensive against empty vCard An empty vCard store may look like the empty table, which does not have the `attr` key, which would then blow up in util.stanza.deserialize.
author Jonas Schäfer <jonas@wielicki.name>
date Sat, 15 Jan 2022 15:39:13 +0100
parent 12117:0c9b64178eda
child 12438:a698f65df453
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
12115
94de6b7596cc mod_tombstones: Remember deleted accounts #1307
Kim Alvefur <zash@zash.se>
parents:
diff changeset
1 -- TODO warn when trying to create an user before the tombstone expires
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Kim Alvefur <zash@zash.se>
parents:
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2 -- e.g. via telnet or other admin interface
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Kim Alvefur <zash@zash.se>
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3 local datetime = require "util.datetime";
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Kim Alvefur <zash@zash.se>
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4 local errors = require "util.error";
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Kim Alvefur <zash@zash.se>
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5 local jid_split = require"util.jid".split;
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Kim Alvefur <zash@zash.se>
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6 local st = require "util.stanza";
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Kim Alvefur <zash@zash.se>
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7
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Kim Alvefur <zash@zash.se>
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8 -- Using a map store as key-value store so that removal of all user data
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Kim Alvefur <zash@zash.se>
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9 -- does not also remove the tombstone, which would defeat the point
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Kim Alvefur <zash@zash.se>
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10 local graveyard = module:open_store(nil, "map");
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11
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Kim Alvefur <zash@zash.se>
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12 local ttl = module:get_option_number("user_tombstone_expiry", nil);
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Kim Alvefur <zash@zash.se>
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13 -- Keep tombstones forever by default
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Kim Alvefur <zash@zash.se>
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14 --
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Kim Alvefur <zash@zash.se>
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15 -- Rationale:
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Kim Alvefur <zash@zash.se>
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16 -- There is no way to be completely sure when remote services have
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Kim Alvefur <zash@zash.se>
parents:
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17 -- forgotten and revoked all memberships.
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Kim Alvefur <zash@zash.se>
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18
12117
0c9b64178eda mod_tombstones: Add some future TODOs
Kim Alvefur <zash@zash.se>
parents: 12115
diff changeset
19 -- TODO If the user left a JID they moved to, return a gone+redirect error
0c9b64178eda mod_tombstones: Add some future TODOs
Kim Alvefur <zash@zash.se>
parents: 12115
diff changeset
20 -- TODO Attempt to deregister from MUCs based on bookmarks
0c9b64178eda mod_tombstones: Add some future TODOs
Kim Alvefur <zash@zash.se>
parents: 12115
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21 -- TODO Unsubscribe from pubsub services if a notification is received
0c9b64178eda mod_tombstones: Add some future TODOs
Kim Alvefur <zash@zash.se>
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22
12115
94de6b7596cc mod_tombstones: Remember deleted accounts #1307
Kim Alvefur <zash@zash.se>
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23 module:hook_global("user-deleted", function(event)
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Kim Alvefur <zash@zash.se>
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24 if event.host == module.host then
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Kim Alvefur <zash@zash.se>
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25 local ok, err = graveyard:set(nil, event.username, os.time());
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Kim Alvefur <zash@zash.se>
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26 if not ok then module:log("error", "Could store tombstone for %s: %s", event.username, err); end
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Kim Alvefur <zash@zash.se>
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27 end
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Kim Alvefur <zash@zash.se>
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28 end);
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29
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Kim Alvefur <zash@zash.se>
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30 -- Public API
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Kim Alvefur <zash@zash.se>
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31 function has_tombstone(username)
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Kim Alvefur <zash@zash.se>
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32 local tombstone, err = graveyard:get(nil, username);
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Kim Alvefur <zash@zash.se>
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33
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Kim Alvefur <zash@zash.se>
parents:
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34 if err or not tombstone then return tombstone, err; end
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Kim Alvefur <zash@zash.se>
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35
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Kim Alvefur <zash@zash.se>
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36 if ttl and tombstone + ttl < os.time() then
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Kim Alvefur <zash@zash.se>
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37 module:log("debug", "Tombstone for %s created at %s has expired", username, datetime.datetime(tombstone));
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Kim Alvefur <zash@zash.se>
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38 graveyard:set(nil, username, nil);
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Kim Alvefur <zash@zash.se>
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39 return nil;
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Kim Alvefur <zash@zash.se>
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40 end
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Kim Alvefur <zash@zash.se>
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41 return tombstone;
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Kim Alvefur <zash@zash.se>
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42 end
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Kim Alvefur <zash@zash.se>
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43
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Kim Alvefur <zash@zash.se>
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44 module:hook("user-registering", function(event)
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Kim Alvefur <zash@zash.se>
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45 local tombstone, err = has_tombstone(event.username);
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46
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Kim Alvefur <zash@zash.se>
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47 if err then
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Kim Alvefur <zash@zash.se>
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48 event.allowed, event.error = errors.coerce(false, err);
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Kim Alvefur <zash@zash.se>
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49 return true;
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Kim Alvefur <zash@zash.se>
parents:
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50 elseif not tombstone then
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Kim Alvefur <zash@zash.se>
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51 -- Feel free
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Kim Alvefur <zash@zash.se>
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52 return;
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Kim Alvefur <zash@zash.se>
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53 end
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Kim Alvefur <zash@zash.se>
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54
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55 module:log("debug", "Tombstone for %s created at %s", event.username, datetime.datetime(tombstone));
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Kim Alvefur <zash@zash.se>
parents:
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56 event.allowed = false;
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Kim Alvefur <zash@zash.se>
parents:
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57 return true;
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Kim Alvefur <zash@zash.se>
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58 end);
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59
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Kim Alvefur <zash@zash.se>
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60 module:hook("presence/bare", function(event)
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Kim Alvefur <zash@zash.se>
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61 local origin, presence = event.origin, event.stanza;
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62
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Kim Alvefur <zash@zash.se>
parents:
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63 -- We want to undo any left-over presence subscriptions and notify the former
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Kim Alvefur <zash@zash.se>
parents:
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64 -- contact that they're gone.
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Kim Alvefur <zash@zash.se>
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65 --
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Kim Alvefur <zash@zash.se>
parents:
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66 -- FIXME This leaks that the user once existed. Hard to avoid without keeping
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Kim Alvefur <zash@zash.se>
parents:
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67 -- the contact list in some form, which we don't want to do for privacy
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Kim Alvefur <zash@zash.se>
parents:
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68 -- reasons. Bloom filter perhaps?
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Kim Alvefur <zash@zash.se>
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69 if has_tombstone(jid_split(presence.attr.to)) then
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Kim Alvefur <zash@zash.se>
parents:
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70 if presence.attr.type == "probe" then
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Kim Alvefur <zash@zash.se>
parents:
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71 origin.send(st.error_reply(presence, "cancel", "gone", "User deleted"));
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Kim Alvefur <zash@zash.se>
parents:
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72 origin.send(st.presence({ type = "unsubscribed"; to = presence.attr.from; from = presence.attr.to }));
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Kim Alvefur <zash@zash.se>
parents:
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73 elseif presence.attr.type == nil or presence.attr.type == "unavailable" then
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Kim Alvefur <zash@zash.se>
parents:
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74 origin.send(st.error_reply(presence, "cancel", "gone", "User deleted"));
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Kim Alvefur <zash@zash.se>
parents:
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75 origin.send(st.presence({ type = "unsubscribe"; to = presence.attr.from; from = presence.attr.to }));
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Kim Alvefur <zash@zash.se>
parents:
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76 end
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Kim Alvefur <zash@zash.se>
parents:
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77 return true;
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Kim Alvefur <zash@zash.se>
parents:
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78 end
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Kim Alvefur <zash@zash.se>
parents:
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79 end, 1);