view mod_invite/mod_invite.lua @ 5186:fa3059e653fa

mod_http_oauth2: Implement the Implicit flow Everyone says this is insecure and bad, but it's also the only thing that makes sense for e.g. pure JavaScript clients, but hey implement this even more complicated thing instead!
author Kim Alvefur <zash@zash.se>
date Thu, 02 Mar 2023 22:06:50 +0100
parents 75b6e5df65f9
children
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local adhoc_new = module:require "adhoc".new;
local uuid_new = require "util.uuid".generate;
local jid_split = require "util.jid".split;
local jid_join = require "util.jid".join;
local http_formdecode = require "net.http".formdecode;
local usermanager = require "core.usermanager";
local rostermanager = require "core.rostermanager";
local tohtml = require "util.stanza".xml_escape
local nodeprep = require "util.encodings".stringprep.nodeprep;
local tostring = tostring;

local invite_storage = module:open_store();
local inviter_storage = module:open_store("inviter");

local serve;
if prosody.process_type == "prosody" then
	local http_files = require "net.http.files";
	serve = http_files.serve;
else
	serve = module:depends"http_files".serve;
end

module:depends"adhoc";
module:depends"http";

local function apply_template(template, args)
	return
		template:gsub("{{([^}]*)}}", function (k)
			if args[k] then
				return tohtml(args[k])
			else
				return k
			end
		end)
end

function generate_page(event, token)
	local response = event.response;

	local tokens = invite_storage:get() or {};

	response.headers.content_type = "text/html; charset=utf-8";

	if not token or token == "" then
		local template = assert(module:load_resource("invite/invite_result.html")):read("*a");

		-- TODO maybe show a friendlier information page instead?
		return apply_template(template, { classes = "alert-danger", message = "No token given" })
	elseif not tokens[token] then
		local template = assert(module:load_resource("invite/invite_result.html")):read("*a");

		return apply_template(template, { classes = "alert-danger", message = "This invite has expired." })
	end

	local template = assert(module:load_resource("invite/invite.html")):read("*a");

	return apply_template(template, { user = jid_join(tokens[token], module.host), server = module.host, token = token });
end

function subscribe(user1, user2)
	local user1_jid = jid_join(user1, module.host);
	local user2_jid = jid_join(user2, module.host);

	rostermanager.set_contact_pending_out(user2, module.host, user1_jid);
	rostermanager.set_contact_pending_in(user1, module.host, user2_jid);
	rostermanager.subscribed(user1, module.host, user2_jid);
	rostermanager.process_inbound_subscription_approval(user2, module.host, user1_jid);
end

function handle_form(event)
	local request, response = event.request, event.response;
	local form_data = http_formdecode(request.body);
	local user, password, token = form_data["user"], form_data["password"], form_data["token"];
	local tokens = invite_storage:get() or {};

	local template = assert(module:load_resource("invite/invite_result.html")):read("*a");

	response.headers.content_type = "text/html; charset=utf-8";

	if not user or #user == 0 or not password or #password == 0 or not token then
		return apply_template(template, { classes = "alert-warning", message = "Please fill in all fields." })
	end

	if not tokens[token] then
		return apply_template(template, { classes = "alert-danger", message = "This invite has expired." })
	end

	-- Shamelessly copied from mod_register_web.
	local prepped_username = nodeprep(user);

	if not prepped_username or #prepped_username == 0 then
		return apply_template(template, { classes = "alert-warning", message = "This username contains invalid characters." })
	end

	if usermanager.user_exists(prepped_username, module.host) then
		return apply_template(template, { classes = "alert-warning", message = "This username is already in use." })
	end

	local registering = { username = prepped_username , host = module.host, allowed = true }

	module:fire_event("user-registering", registering);

	if not registering.allowed then
		return apply_template(template, { classes = "alert-danger", message = "Registration is not allowed." })
	end

	local ok, err = usermanager.create_user(prepped_username, password, module.host);

	if ok then
		subscribe(prepped_username, tokens[token]);
		subscribe(tokens[token], prepped_username);

		inviter_storage:set(prepped_username, { inviter = tokens[token] });

		rostermanager.roster_push(tokens[token], module.host, jid_join(prepped_username, module.host));

		tokens[token] = nil;

		invite_storage:set(nil, tokens);

		module:fire_event("user-registered", {
			username = prepped_username, host = module.host, source = "mod_invite", });

		return apply_template(template, { classes = "alert-success",
			message = "Your account has been created! You can now log in using an XMPP client." })
	else
		module:log("debug", "Registration failed: " .. tostring(err));

		return apply_template(template, { classes = "alert-danger", message = "An unknown error has occurred." })
	end
end

module:provides("http", {
	route = {
		["GET /bootstrap.min.css"] = serve(module:get_directory() .. "/invite/bootstrap.min.css");
		["GET /*"] = generate_page;
		POST = handle_form;
	};
});

function invite_command_handler(_, data)
	local uuid = uuid_new();

	local user, host = jid_split(data.from);

	if host ~= module.host then
		return { status = "completed", error = { message = "You are not allowed to invite users to this server." }};
	end

	local tokens = invite_storage:get() or {};

	tokens[uuid] = user;

	invite_storage:set(nil, tokens);

	return { info = module:http_url() .. "/" .. uuid, status = "completed" };
end

local adhoc_invite = adhoc_new("Invite user", "invite", invite_command_handler, "local_user")

module:add_item("adhoc", adhoc_invite);