-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

--

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

local st = require "util.stanza";

local dataform_new = require "util.dataforms".new;

local usermanager_user_exists = require "core.usermanager".user_exists;

local usermanager_create_user = require "core.usermanager".create_user;

local usermanager_delete_user = require "core.usermanager".delete_user;

local nodeprep = require "util.encodings".stringprep.nodeprep;

local additional_fields = module:get_option("additional_registration_fields", {});

local require_encryption = module:get_option_boolean("c2s_require_encryption",

	module:get_option_boolean("require_encryption", false));

pcall(function ()

	module:depends("register_limits");

end);

local account_details = module:open_store("account_details");

local field_map = {

	FORM_TYPE = { name = "FORM_TYPE", type = "hidden", value = "jabber:iq:register" };

	username = { name = "username", type = "text-single", label = "Username", required = true };

	password = { name = "password", type = "text-private", label = "Password", required = true };

	nick = { name = "nick", type = "text-single", label = "Nickname" };

	name = { name = "name", type = "text-single", label = "Full Name" };

	first = { name = "first", type = "text-single", label = "Given Name" };

	last = { name = "last", type = "text-single", label = "Family Name" };

	email = { name = "email", type = "text-single", label = "Email" };

	address = { name = "address", type = "text-single", label = "Street" };

	city = { name = "city", type = "text-single", label = "City" };

	state = { name = "state", type = "text-single", label = "State" };

	zip = { name = "zip", type = "text-single", label = "Postal code" };

	phone = { name = "phone", type = "text-single", label = "Telephone number" };

	url = { name = "url", type = "text-single", label = "Webpage" };

	date = { name = "date", type = "text-single", label = "Birth date" };

};

local title = module:get_option_string("registration_title",

	"Creating a new account");

local instructions = module:get_option_string("registration_instructions",

	"Choose a username and password for use with this service.");

local registration_form = dataform_new{

	title = title;

	instructions = instructions;

	field_map.FORM_TYPE;

	field_map.username;

	field_map.password;

};

local registration_query = st.stanza("query", {xmlns = "jabber:iq:register"})

	:tag("instructions"):text(instructions):up()

	:tag("username"):up()

	:tag("password"):up();

for _, field in ipairs(additional_fields) do

	if type(field) == "table" then

		registration_form[#registration_form + 1] = field;

	elseif field_map[field] or field_map[field:sub(1, -2)] then

		if field:match("%+$") then

			field = field:sub(1, -2);

			field_map[field].required = true;

		end

		registration_form[#registration_form + 1] = field_map[field];

		registration_query:tag(field):up();

	else

		module:log("error", "Unknown field %q", field);

	end

end

registration_query:add_child(registration_form:form());

local register_stream_feature = st.stanza("register", {xmlns="http://jabber.org/features/iq-register"}):up();

module:hook("stream-features", function(event)

	local session, features = event.origin, event.features;

	-- Advertise registration to unauthorized clients only.

	if session.type ~= "c2s_unauthed" or (require_encryption and not session.secure) then

		return

	end

	features:add_child(register_stream_feature);

end);

local function parse_response(query)

	local form = query:get_child("x", "jabber:x:data");

	if form then

		return registration_form:data(form);

	else

		local data = {};

		local errors = {};

		for _, field in ipairs(registration_form) do

			local name, required = field.name, field.required;

			if field_map[name] then

				data[name] = query:get_child_text(name);

				if (not data[name] or #data[name] == 0) and required then

					errors[name] = "Required value missing";

				end

			end

		end

		if next(errors) then

			return data, errors;

		end

		return data;

	end

end

-- In-band registration

module:hook("stanza/iq/jabber:iq:register:query", function(event)

	local session, stanza = event.origin, event.stanza;

	local log = session.log or module._log;

	if session.type ~= "c2s_unauthed" then

		log("debug", "Attempted registration when disabled or already authenticated");

		session.send(st.error_reply(stanza, "cancel", "service-unavailable"));

		return true;

	end

	if require_encryption and not session.secure then

		session.send(st.error_reply(stanza, "modify", "policy-violation", "Encryption is required"));

		return true;

	end

	local query = stanza.tags[1];

	if stanza.attr.type == "get" then

		local reply = st.reply(stanza);

		reply:add_child(registration_query);

		session.send(reply);

		return true;

	end

	-- stanza.attr.type == "set"

	if query.tags[1] and query.tags[1].name == "remove" then

		session.send(st.error_reply(stanza, "auth", "registration-required"));

		return true;

	end

	local data, errors = parse_response(query);

	if errors then

		log("debug", "Error parsing registration form:");

		local textual_errors = {};

		for field, err in pairs(errors) do

			log("debug", "Field %q: %s", field, err);

			table.insert(textual_errors, ("%s: %s"):format(field:gsub("^%a", string.upper), err));

		end

		session.send(st.error_reply(stanza, "modify", "not-acceptable", table.concat(textual_errors, "\n")));

		return true;

	end

	local username, password = nodeprep(data.username), data.password;

	data.username, data.password = nil, nil;

	local host = module.host;

	if not username or username == "" then

		log("debug", "The requested username is invalid.");

		session.send(st.error_reply(stanza, "modify", "not-acceptable", "The requested username is invalid."));

		return true;

	end

	local user = { username = username, password = password, host = host, additional = data, ip = session.ip, session = session, allowed = true }

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

	if not user.allowed then

		log("debug", "Registration disallowed by module: %s", user.reason or "no reason given");

		session.send(st.error_reply(stanza, "modify", "not-acceptable", user.reason));

		return true;

	end

	if usermanager_user_exists(username, host) then

		log("debug", "Attempt to register with existing username");

		session.send(st.error_reply(stanza, "cancel", "conflict", "The requested username already exists."));

		return true;

	end

	-- TODO unable to write file, file may be locked, etc, what's the correct error?

	local error_reply = st.error_reply(stanza, "wait", "internal-server-error", "Failed to write data to disk.");

	if usermanager_create_user(username, password, host) then

		data.registered = os.time();

		if not account_details:set(username, data) then

			log("debug", "Could not store extra details");

			usermanager_delete_user(username, host);

			session.send(error_reply);

			return true;

		end

		session.send(st.reply(stanza)); -- user created!

		log("info", "User account created: %s@%s", username, host);

		module:fire_event("user-registered", {

			username = username, host = host, source = "mod_register",

			session = session });

	else

		log("debug", "Could not create user");

		session.send(error_reply);

	end

	return true;

end);