mod_welcome_page/mod_welcome_page.lua
author Matthew Wild <mwild1@gmail.com>
Fri, 09 Oct 2020 12:19:46 +0100
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mod_welcome_page: New module to provide a friendly entrypoint to invite-based setups
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local st = require "util.stanza";
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local url_escape = require "util.http".urlencode;
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local render_html_template = require"util.interpolation".new("%b{}", st.xml_escape, {
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	urlescape = url_escape;
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});
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local template_path = module:get_option_string("welcome_page_template_path", module:get_directory().."/html");
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local user_vars = module:get_option("welcome_page_variables", {});
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local site_name = module:get_option("site_name", module.host);
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local invite_only = module:get_option_boolean("registration_invite_only", true);
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local open_registration = module:get_option_boolean("welcome_page_open_registration", not invite_only);
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module:depends("http");
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local invites = module:depends("invites");
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local function load_template(path)
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	local template_file, err = io.open(path);
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	if not template_file then
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		error("Unable to load template file: "..tostring(err));
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	end
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	local template = template_file:read("*a");
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	template_file:close();
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	return template;
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end
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local template = load_template(template_path.."/index.html");
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local function serve_page(event)
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	event.response.headers["Content-Type"] = "text/html; charset=utf-8";
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	return render_html_template(template, {
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		site_name = site_name;
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		request = event.request;
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		var = user_vars;
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	});
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end
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local function handle_submit(event)
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	local submission = { allowed = open_registration, request = event.request };
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	module:fire_event("mod_welcome_page/submission", submission);
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	if not submission.allowed then
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		event.response.headers["Content-Type"] = "text/html; charset=utf-8";
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		return render_html_template(template, {
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			site_name = site_name;
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			request = event.request;
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			var = user_vars;
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			message = {
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				class = "alert-danger";
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				text = submission.reason or "Account creation is not possible at this time";
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			};
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		});
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	end
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	local invite = invites.create_account(nil, { source = module.name });
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	if not invite then
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		return 500;
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	end
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	event.response.headers.Location = invite.landing_page or invite.uri;
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	return 303;
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end
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local http_files = module:depends("http_files");
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module:provides("http", {
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	route = {
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		["GET"] = serve_page;
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		["GET /*"] = http_files.serve({ path = template_path });
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		["POST"] = handle_submit;
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	};
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});