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79 lines
2.9 KiB
Lua
79 lines
2.9 KiB
Lua
-- TODO warn when trying to create an user before the tombstone expires
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-- e.g. via telnet or other admin interface
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local datetime = require "util.datetime";
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local errors = require "util.error";
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local jid_split = require"util.jid".split;
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local st = require "util.stanza";
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-- Using a map store as key-value store so that removal of all user data
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-- does not also remove the tombstone, which would defeat the point
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local graveyard = module:open_store(nil, "map");
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local ttl = module:get_option_number("user_tombstone_expiry", nil);
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-- Keep tombstones forever by default
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--
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-- Rationale:
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-- There is no way to be completely sure when remote services have
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-- forgotten and revoked all memberships.
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-- TODO If the user left a JID they moved to, return a gone+redirect error
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-- TODO Attempt to deregister from MUCs based on bookmarks
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-- TODO Unsubscribe from pubsub services if a notification is received
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module:hook_global("user-deleted", function(event)
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if event.host == module.host then
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local ok, err = graveyard:set(nil, event.username, os.time());
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if not ok then module:log("error", "Could store tombstone for %s: %s", event.username, err); end
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end
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end);
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-- Public API
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function has_tombstone(username)
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local tombstone, err = graveyard:get(nil, username);
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if err or not tombstone then return tombstone, err; end
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if ttl and tombstone + ttl < os.time() then
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module:log("debug", "Tombstone for %s created at %s has expired", username, datetime.datetime(tombstone));
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graveyard:set(nil, username, nil);
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return nil;
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end
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return tombstone;
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end
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module:hook("user-registering", function(event)
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local tombstone, err = has_tombstone(event.username);
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if err then
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event.allowed, event.error = errors.coerce(false, err);
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return true;
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elseif not tombstone then
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-- Feel free
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return;
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end
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module:log("debug", "Tombstone for %s created at %s", event.username, datetime.datetime(tombstone));
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event.allowed = false;
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return true;
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end);
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module:hook("presence/bare", function(event)
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local origin, presence = event.origin, event.stanza;
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-- We want to undo any left-over presence subscriptions and notify the former
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-- contact that they're gone.
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--
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-- FIXME This leaks that the user once existed. Hard to avoid without keeping
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-- the contact list in some form, which we don't want to do for privacy
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-- reasons. Bloom filter perhaps?
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if has_tombstone(jid_split(presence.attr.to)) then
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if presence.attr.type == "probe" then
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origin.send(st.error_reply(presence, "cancel", "gone", "User deleted"));
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origin.send(st.presence({ type = "unsubscribed"; to = presence.attr.from; from = presence.attr.to }));
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elseif presence.attr.type == nil or presence.attr.type == "unavailable" then
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origin.send(st.error_reply(presence, "cancel", "gone", "User deleted"));
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origin.send(st.presence({ type = "unsubscribe"; to = presence.attr.from; from = presence.attr.to }));
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end
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return true;
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end
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end, 1);
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