-- 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 hosts = _G.hosts;

local st = require "util.stanza";

local datamanager = require "util.datamanager";

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

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

local usermanager_set_password = require "core.usermanager".set_password;

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

local os_time = os.time;

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

local jid_bare = require "util.jid".bare;

local compat = module:get_option_boolean("registration_compat", true);

module:add_feature("jabber:iq:register");

local function handle_registration_stanza(event)

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

	local query = stanza.tags[1];

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

		local reply = st.reply(stanza);

		reply:tag("query", {xmlns = "jabber:iq:register"})

			:tag("registered"):up()

			:tag("username"):text(session.username):up()

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

		session.send(reply);

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

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

			-- TODO delete user auth data, send iq response, kick all user resources with a <not-authorized/>, delete all user data

			local username, host = session.username, session.host;

			local ok, err = usermanager_delete_user(username, host);

			if not ok then

				module:log("debug", "Removing user account %s@%s failed: %s", username, host, err);

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

				return true;

			end

			session.send(st.reply(stanza));

			local roster = session.roster;

			for _, session in pairs(hosts[host].sessions[username].sessions) do -- disconnect all resources

				session:close({condition = "not-authorized", text = "Account deleted"});

			end

			-- TODO datamanager should be able to delete all user data itself

			datamanager.store(username, host, "vcard", nil);

			datamanager.store(username, host, "private", nil);

			datamanager.list_store(username, host, "offline", nil);

			local bare = username.."@"..host;

			for jid, item in pairs(roster) do

				if jid and jid ~= "pending" then

					if item.subscription == "both" or item.subscription == "from" or (roster.pending and roster.pending[jid]) then

						core_post_stanza(hosts[host], st.presence({type="unsubscribed", from=bare, to=jid}));

					end

					if item.subscription == "both" or item.subscription == "to" or item.ask then

						core_post_stanza(hosts[host], st.presence({type="unsubscribe", from=bare, to=jid}));

					end

				end

			end

			datamanager.store(username, host, "roster", nil);

			datamanager.store(username, host, "privacy", nil);

			module:log("info", "User removed their account: %s@%s", username, host);

			module:fire_event("user-deregistered", { username = username, host = host, source = "mod_register", session = session });

		else

			local username = nodeprep(query:get_child("username"):get_text());

			local password = query:get_child("password"):get_text();

			if username and password then

				if username == session.username then

					if usermanager_set_password(username, password, session.host) then

						session.send(st.reply(stanza));

					else

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

						session.send(st.error_reply(stanza, "wait", "internal-server-error"));

					end

				else

					session.send(st.error_reply(stanza, "modify", "bad-request"));

				end

			else

				session.send(st.error_reply(stanza, "modify", "bad-request"));

			end

		end

	end

	return true;

end

module:hook("iq/self/jabber:iq:register:query", handle_registration_stanza);

if compat then

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

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

		if session.type == "c2s" and jid_bare(stanza.attr.to) == session.host then

			return handle_registration_stanza(event);

		end

	end);

end

local recent_ips = {};

local min_seconds_between_registrations = module:get_option("min_seconds_between_registrations");

local whitelist_only = module:get_option("whitelist_registration_only");

local whitelisted_ips = module:get_option("registration_whitelist") or { "127.0.0.1" };

local blacklisted_ips = module:get_option("registration_blacklist") or {};

for _, ip in ipairs(whitelisted_ips) do whitelisted_ips[ip] = true; end

for _, ip in ipairs(blacklisted_ips) do blacklisted_ips[ip] = true; end

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

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

	if module:get_option("allow_registration") == false or session.type ~= "c2s_unauthed" then

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

	else

		local query = stanza.tags[1];

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

			local reply = st.reply(stanza);

			reply:tag("query", {xmlns = "jabber:iq:register"})

				:tag("instructions"):text("Choose a username and password for use with this service."):up()

				:tag("username"):up()

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

			session.send(reply);

		elseif stanza.attr.type == "set" then

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

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

			else

				local username = query:child_with_name("username");

				local password = query:child_with_name("password");

				if username and password then

					-- Check that the user is not blacklisted or registering too often

					if not session.ip then

						module:log("debug", "User's IP not known; can't apply blacklist/whitelist");

					elseif blacklisted_ips[session.ip] or (whitelist_only and not whitelisted_ips[session.ip]) then

						session.send(st.error_reply(stanza, "cancel", "not-acceptable", "You are not allowed to register an account."));

						return true;

					elseif min_seconds_between_registrations and not whitelisted_ips[session.ip] then

						if not recent_ips[session.ip] then

							recent_ips[session.ip] = { time = os_time(), count = 1 };

						else

							local ip = recent_ips[session.ip];

							ip.count = ip.count + 1;

							if os_time() - ip.time < min_seconds_between_registrations then

								ip.time = os_time();

								session.send(st.error_reply(stanza, "wait", "not-acceptable"));

								return true;

							end

							ip.time = os_time();

						end

					end

					-- FIXME shouldn't use table.concat

					username = nodeprep(table.concat(username));

					password = table.concat(password);

					local host = module.host;

					if not username or username == "" then

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

					elseif usermanager_user_exists(username, host) then

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

					else

						if usermanager_create_user(username, password, host) then

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

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

							module:fire_event("user-registered", {

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

								session = session });

						else

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

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

						end

					end

				else

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

				end

			end

		end

	end

	return true;

end);