--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_welcome_page/mod_welcome_page.lua	Fri Oct 09 12:19:46 2020 +0100
@@ -0,0 +1,71 @@
+local st = require "util.stanza";
+local url_escape = require "util.http".urlencode;
+local render_html_template = require"util.interpolation".new("%b{}", st.xml_escape, {
+	urlescape = url_escape;
+});
+
+local template_path = module:get_option_string("welcome_page_template_path", module:get_directory().."/html");
+local user_vars = module:get_option("welcome_page_variables", {});
+local site_name = module:get_option("site_name", module.host);
+local invite_only = module:get_option_boolean("registration_invite_only", true);
+local open_registration = module:get_option_boolean("welcome_page_open_registration", not invite_only);
+
+module:depends("http");
+local invites = module:depends("invites");
+
+local function load_template(path)
+	local template_file, err = io.open(path);
+	if not template_file then
+		error("Unable to load template file: "..tostring(err));
+	end
+	local template = template_file:read("*a");
+	template_file:close();
+	return template;
+end
+
+local template = load_template(template_path.."/index.html");
+
+local function serve_page(event)
+	event.response.headers["Content-Type"] = "text/html; charset=utf-8";
+	return render_html_template(template, {
+		site_name = site_name;
+		request = event.request;
+		var = user_vars;
+	});
+end
+
+local function handle_submit(event)
+	local submission = { allowed = open_registration, request = event.request };
+	module:fire_event("mod_welcome_page/submission", submission);
+	if not submission.allowed then
+		event.response.headers["Content-Type"] = "text/html; charset=utf-8";
+		return render_html_template(template, {
+			site_name = site_name;
+			request = event.request;
+			var = user_vars;
+			message = {
+				class = "alert-danger";
+				text = submission.reason or "Account creation is not possible at this time";
+			};
+		});
+	end
+
+	local invite = invites.create_account(nil, { source = module.name });
+	if not invite then
+		return 500;
+	end
+
+	event.response.headers.Location = invite.landing_page or invite.uri;
+
+	return 303;
+end
+
+local http_files = module:depends("http_files");
+
+module:provides("http", {
+	route = {
+		["GET"] = serve_page;
+		["GET /*"] = http_files.serve({ path = template_path });
+		["POST"] = handle_submit;
+	};
+});