Update to 2021-12-01 19:13

roles/prosody/files/mod_participant_metadata.lua

@@ -0,0 +1,53 @@
+local _jid = require "util.jid";
+
+log('info', 'Loaded Custom Presence identity');
+
+module:hook("pre-presence/full", function (event)
+
+  local function get_room_from_jid(jid)
+    local node, host = _jid.split(jid);
+    local component = hosts[host];
+      
+    if component then
+      local muc = component.modules.muc
+      if muc and rawget(muc,"rooms") then
+        -- We're running 0.9.x or 0.10 (old MUC API)
+        return muc.rooms[jid];
+      elseif muc and rawget(muc,"get_room_from_jid") then
+        -- We're running >0.10 (new MUC API)
+        return muc.get_room_from_jid(jid);
+      else
+        return
+      end
+    end
+  end
+
+  local origin, stanza = event.origin, event.stanza;
+  local to = _jid.bare(stanza.attr.to);
+
+  if get_room_from_jid(to) then
+    local room = get_room_from_jid(to);
+    local occupant = room._occupants[tostring(stanza.attr.to)];
+
+    if occupant then
+      local email = stanza:get_child_text("email") or "";
+      local role = tostring(occupant.role);
+
+      if email ~= "" and role == "moderator" then
+        stanza:maptags(
+          function(tag)
+            for k, v in pairs(tag) do
+              if k == "name" and v == "identity" then
+                return nil
+              end
+            end
+          return tag
+        end)
+
+        stanza:tag("identity"):tag("user");
+        stanza:tag("id"):text(email):up();
+        stanza:up();
+      end
+    end
+  end
+end);