-- 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 modulemanager = require "core.modulemanager";

local log = require "util.logger".init("usermanager");

local type = type;

local it = require "util.iterators";

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

local jid_split = require "util.jid".split;

local jid_prep = require "util.jid".prep;

local config = require "core.configmanager";

local sasl_new = require "util.sasl".new;

local storagemanager = require "core.storagemanager";

local set = require "util.set";

local prosody = _G.prosody;

local hosts = prosody.hosts;

local setmetatable = setmetatable;

local default_provider = "internal_hashed";

local _ENV = nil;

-- luacheck: std none

local function new_null_provider()

	local function dummy() return nil, "method not implemented"; end;

	local function dummy_get_sasl_handler() return sasl_new(nil, {}); end

	return setmetatable({name = "null", get_sasl_handler = dummy_get_sasl_handler}, {

		__index = function(self, method) return dummy; end --luacheck: ignore 212

	});

end

local global_admins_config = config.get("*", "admins");

if type(global_admins_config) ~= "table" then

	global_admins_config = nil; -- TODO: factor out moduleapi magic config handling and use it here

end

local global_admins = set.new(global_admins_config) / jid_prep;

local admin_role = { ["prosody:admin"] = true };

local global_authz_provider = {

	get_user_roles = function (user) end; --luacheck: ignore 212/user

	get_jid_roles = function (jid)

		if global_admins:contains(jid) then

			return admin_role;

		end

	end;

	get_jids_with_role = function (role)

		if role ~= "prosody:admin" then return {}; end

		return it.to_array(global_admins);

	end;

	set_user_roles = function (user, roles) end; -- luacheck: ignore 212

	set_jid_roles = function (jid, roles) end; -- luacheck: ignore 212

};

local provider_mt = { __index = new_null_provider() };

local function initialize_host(host)

	local host_session = hosts[host];

	local authz_provider_name = config.get(host, "authorization") or "internal";

	local authz_mod = modulemanager.load(host, "authz_"..authz_provider_name);

	host_session.authz = authz_mod or global_authz_provider;

	if host_session.type ~= "local" then return; end

	host_session.events.add_handler("item-added/auth-provider", function (event)

		local provider = event.item;

		local auth_provider = config.get(host, "authentication") or default_provider;

		if config.get(host, "anonymous_login") then

			log("error", "Deprecated config option 'anonymous_login'. Use authentication = 'anonymous' instead.");

			auth_provider = "anonymous";

		end -- COMPAT 0.7

		if provider.name == auth_provider then

			host_session.users = setmetatable(provider, provider_mt);

		end

		if host_session.users ~= nil and host_session.users.name ~= nil then

			log("debug", "Host '%s' now set to use user provider '%s'", host, host_session.users.name);

		end

	end);

	host_session.events.add_handler("item-removed/auth-provider", function (event)

		local provider = event.item;

		if host_session.users == provider then

			host_session.users = new_null_provider();

		end

	end);

	host_session.users = new_null_provider(); -- Start with the default usermanager provider

	local auth_provider = config.get(host, "authentication") or default_provider;

	if config.get(host, "anonymous_login") then auth_provider = "anonymous"; end -- COMPAT 0.7

	if auth_provider ~= "null" then

		modulemanager.load(host, "auth_"..auth_provider);

	end

end;

prosody.events.add_handler("host-activated", initialize_host, 100);

local function test_password(username, host, password)

	return hosts[host].users.test_password(username, password);

end

local function get_password(username, host)

	return hosts[host].users.get_password(username);

end

local function set_password(username, password, host, resource)

	local ok, err = hosts[host].users.set_password(username, password);

	if ok then

		prosody.events.fire_event("user-password-changed", { username = username, host = host, resource = resource });

	end

	return ok, err;

end

local function user_exists(username, host)

	if hosts[host].sessions[username] then return true; end

	return hosts[host].users.user_exists(username);

end

local function create_user(username, password, host)

	return hosts[host].users.create_user(username, password);

end

local function delete_user(username, host)

	local ok, err = hosts[host].users.delete_user(username);

	if not ok then return nil, err; end

	prosody.events.fire_event("user-deleted", { username = username, host = host });

	return storagemanager.purge(username, host);

end

local function users(host)

	return hosts[host].users.users();

end

local function get_sasl_handler(host, session)

	return hosts[host].users.get_sasl_handler(session);

end

local function get_provider(host)

	return hosts[host].users;

end

local function get_roles(jid, host)

	if host and not hosts[host] then return false; end

	if type(jid) ~= "string" then return false; end

	jid = jid_bare(jid);

	host = host or "*";

	local actor_user, actor_host = jid_split(jid);

	local roles;

	local authz_provider = (host ~= "*" and hosts[host].authz) or global_authz_provider;

	if actor_user and actor_host == host then -- Local user

		roles = authz_provider.get_user_roles(actor_user);

	else -- Remote user/JID

		roles = authz_provider.get_jid_roles(jid);

	end

	return roles;

end

local function set_roles(jid, host, roles)

	if host and not hosts[host] then return false; end

	if type(jid) ~= "string" then return false; end

	jid = jid_bare(jid);

	host = host or "*";

	local actor_user, actor_host = jid_split(jid);

	local authz_provider = (host ~= "*" and hosts[host].authz) or global_authz_provider;

	if actor_user and actor_host == host then -- Local user

		local ok, err = authz_provider.set_user_roles(actor_user, roles);

		if ok then

			prosody.events.fire_event("user-roles-changed", {

				username = actor_user, host = actor_host

			});

		end

		return ok, err;

	else -- Remote entity

		return authz_provider.set_jid_roles(jid, roles)

	end

end

local function is_admin(jid, host)

	local roles = get_roles(jid, host);

	return roles and roles["prosody:admin"];

end

local function get_users_with_role(role, host)

	if not hosts[host] then return false; end

	if type(role) ~= "string" then return false; end

	return hosts[host].authz.get_users_with_role(role);

end

local function get_jids_with_role(role, host)

	if host and not hosts[host] then return false; end

	if type(role) ~= "string" then return false; end

	host = host or "*";

	local authz_provider = (host ~= "*" and hosts[host].authz) or global_authz_provider;

	return authz_provider.get_jids_with_role(role);

end

return {

	new_null_provider = new_null_provider;

	initialize_host = initialize_host;

	test_password = test_password;

	get_password = get_password;

	set_password = set_password;

	user_exists = user_exists;

	create_user = create_user;

	delete_user = delete_user;

	users = users;

	get_sasl_handler = get_sasl_handler;

	get_provider = get_provider;

	get_roles = get_roles;

	set_roles = set_roles;

	is_admin = is_admin;

	get_users_with_role = get_users_with_role;

	get_jids_with_role = get_jids_with_role;

};