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annotate mod_protect_last_admin/mod_protect_last_admin.lua @ 6398:9c9889ad4302

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mod_unsubscriber: Add MUC support This catches XEP-0045 Join stanzas and replies with an error telling the prospective participant that the supposed MUC is gone. The user or their client can then take action to remove any bookmark or at least disable autojoin.
author Kim Alvefur <zash@zash.se>
date Sat, 07 Feb 2026 12:25:52 +0100
parents 187b957dc528
children d1f64ffca879
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1 module:set_global();
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2
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3 local um = require "prosody.core.usermanager";
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4
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5 local set = require "prosody.util.set";
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6
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7 local protected_roles = module:get_option_set("protect_last_admin_roles", { "prosody:admin", "prosody:operator" });
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8
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9 local errors = require "prosody.util.error".init(module.name, {
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10 ["cannot-remove-only-admin"] = {
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11 code = 400;
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12 type = "cancel";
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13 condition = "service-unavailable";
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14 text = "Cannot remove the only administrator";
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15 extra = {
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16 namespace = "https://prosody.im/protocol/errors";
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17 condition = "cannot-remove-only-admin";
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18 };
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19 };
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20 });
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21
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22 local function other_protected_users(username, host)
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23 local protected_users = set.new();
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24 for protected_role in protected_roles do
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25 local users = um.get_users_with_role(protected_role, host);
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26 module:log("debug", "Role %s: %s", protected_role, require "util.serialization".serialize(users, "debug"));
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27 protected_users:add_list(um.get_users_with_role(protected_role, host));
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28 end
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29 protected_users:remove(username);
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30 return not protected_users:empty();
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31 end
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32
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33 function check_last_admin(event)
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34 local username, host = event.username, event.host;
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35
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36 local current_role = um.get_user_role(username, host);
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37 if not current_role then
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38 module:log("warn", "Couldn't detect role for %s@%s", username, host);
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39 return;
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40 end
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42 module:log("debug", "Checking whether to allow this event...");
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43
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44 if event.role_name and protected_roles:contains(event.role_name) then
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45 module:log("debug", "Permitting role change to %s", event.role_name);
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46 return; -- Switching to another protected role is fine
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47 end
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48
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49 if not protected_roles:contains(current_role.name) then
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50 module:log("debug", "Permitting event, role %s is not protected", current_role.name);
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51 return; -- This is not a protected user
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52 end
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53
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54 if not other_protected_users(username, host) then
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55 event.reason = errors.new("cannot-remove-only-admin");
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56 return false;
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57 end
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58 module:log("debug", "Permitting event, no reason not to!");
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59 end
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60
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61 module:hook("pre-delete-user", check_last_admin);
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62 module:hook("pre-disable-user", check_last_admin);
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63 module:hook("pre-user-role-change", check_last_admin);