--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_muc_members_json/mod_muc_members_json.lua	Fri Jul 07 01:25:44 2023 +0100
@@ -0,0 +1,91 @@
+local http = require "net.http";
+local json = require "util.json";
+
+local json_url = assert(module:get_option_string("muc_members_json_url"), "muc_members_json_url required");
+local managed_mucs = module:get_option("muc_members_json_mucs");
+
+local mod_muc = module:depends("muc");
+
+--[[
+{
+	xsf = {
+		team_hats = {
+			board = {
+				id = "xmpp:xmpp.org/hats/board";
+				title = "Board";
+			};
+		};
+		member_hat = {
+			id = "xmpp:xmpp.org/hats/member";
+			title = "XSF member";
+		};
+	};
+	iteam = {
+		team_hats = {
+			iteam = {
+				id = "xmpp:xmpp.org/hats/iteam";
+				title = "Infra team";
+			};
+		};
+	};
+}
+--]]
+
+local function get_hats(member_info, muc_config)
+	local hats = {};
+	if muc_config.member_hat then
+		hats[muc_config.member_hat.id] = {
+			title = muc_config.member_hat.title;
+		};
+	end
+	if muc_config.team_hats and member_info.roles then
+		for _, role in ipairs(member_info.roles) do
+			local hat = muc_config.team_hats[role];
+			if hat then
+				hats[hat.id] = {
+					title = hat.title;
+				};
+			end
+		end
+	end
+	return hats;
+end
+
+function module.load()
+	http.request(json_url)
+		:next(function (result)
+			return json.decode(result.body);
+		end)
+		:next(function (data)
+			module:log("debug", "DATA: %s", require "util.serialization".serialize(data, "debug"));
+
+			for name, muc_config in pairs(managed_mucs) do
+				local muc_jid = name.."@"..module.host;
+				local muc = mod_muc.get_room_from_jid(muc_jid);
+				module:log("warn", "%s -> %s -> %s", name, muc_jid, muc);
+				if muc then
+					local jids = {};
+					for _, member_info in ipairs(data.members) do
+						for _, member_jid in ipairs(member_info.jids) do
+							jids[member_jid] = true;
+							local affiliation = muc:get_affiliation(member_jid);
+							if not affiliation then
+								muc:set_affiliation(true, member_jid, "member", "imported membership");
+								muc:set_affiliation_data(member_jid, "source", module.name);
+							end
+							muc:set_affiliation_data(member_jid, "hats", get_hats(member_info, muc_config));
+						end
+					end
+					-- Remove affiliation from folk who weren't in the source data but previously were
+					for jid, aff, data in muc:each_affiliation() do
+						if not jids[jid] and data.source == module.name then
+							muc:set_affiliation(true, jid, "none", "imported membership lost");
+						end
+					end
+				end
+			end
+
+		end):catch(function (err)
+			module:log("error", "FAILED: %s", err);
+		end);
+end