-- 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.

--

-- luacheck: ignore 212/self

module:set_global();

module:depends("admin_socket");

local hostmanager = require "core.hostmanager";

local modulemanager = require "core.modulemanager";

local s2smanager = require "core.s2smanager";

local portmanager = require "core.portmanager";

local helpers = require "util.helpers";

local server = require "net.server";

local st = require "util.stanza";

local _G = _G;

local prosody = _G.prosody;

local unpack = table.unpack or unpack; -- luacheck: ignore 113

local iterators = require "util.iterators";

local keys, values = iterators.keys, iterators.values;

local jid_bare, jid_split, jid_join = import("util.jid", "bare", "prepped_split", "join");

local set, array = require "util.set", require "util.array";

local cert_verify_identity = require "util.x509".verify_identity;

local envload = require "util.envload".envload;

local envloadfile = require "util.envload".envloadfile;

local has_pposix, pposix = pcall(require, "util.pposix");

local async = require "util.async";

local serialization = require "util.serialization";

local serialize_config = serialization.new ({ fatal = false, unquoted = true});

local time = require "util.time";

local t_insert = table.insert;

local t_concat = table.concat;

local format_number = require "util.human.units".format;

local format_table = require "util.human.io".table;

local commands = module:shared("commands")

local def_env = module:shared("env");

local default_env_mt = { __index = def_env };

local function redirect_output(target, session)

	local env = setmetatable({ print = session.print }, { __index = function (_, k) return rawget(target, k); end });

	env.dofile = function(name)

		local f, err = envloadfile(name, env);

		if not f then return f, err; end

		return f();

	end;

	return env;

end

console = {};

local runner_callbacks = {};

function runner_callbacks:error(err)

	module:log("error", "Traceback[shell]: %s", err);

	self.data.print("Fatal error while running command, it did not complete");

	self.data.print("Error: "..tostring(err));

end

local function send_repl_output(session, line)

	return session.send(st.stanza("repl-output"):text(tostring(line)));

end

function console:new_session(admin_session)

	local session = {

			send = function (t)

				return send_repl_output(admin_session, t);

			end;

			print = function (...)

				local t = {};

				for i=1,select("#", ...) do

					t[i] = tostring(select(i, ...));

				end

				return send_repl_output(admin_session, table.concat(t, "\t"));

			end;

			serialize = tostring;

			disconnect = function () admin_session:close(); end;

			};

	session.env = setmetatable({}, default_env_mt);

	session.thread = async.runner(function (line)

		console:process_line(session, line);

	end, runner_callbacks, session);

	-- Load up environment with helper objects

	for name, t in pairs(def_env) do

		if type(t) == "table" then

			session.env[name] = setmetatable({ session = session }, { __index = t });

		end

	end

	session.env.output:configure();

	return session;

end

local function handle_line(event)

	local session = event.origin.shell_session;

	if not session then

		session = console:new_session(event.origin);

		event.origin.shell_session = session;

	end

	local line = event.stanza:get_text();

	local useglobalenv;

	local result = st.stanza("repl-result");

	if line:match("^>") then

		line = line:gsub("^>", "");

		useglobalenv = true;

	else

		local command = line:match("^%w+") or line:match("%p");

		if commands[command] then

			commands[command](session, line);

			event.origin.send(result);

			return;

		end

	end

	session.env._ = line;

	if not useglobalenv and commands[line:lower()] then

		commands[line:lower()](session, line);

		event.origin.send(result);

		return;

	end

	local chunkname = "=console";

	local env = (useglobalenv and redirect_output(_G, session)) or session.env or nil

	-- luacheck: ignore 311/err

	local chunk, err = envload("return "..line, chunkname, env);

	if not chunk then

		chunk, err = envload(line, chunkname, env);

		if not chunk then

			err = err:gsub("^%[string .-%]:%d+: ", "");

			err = err:gsub("^:%d+: ", "");

			err = err:gsub("'<eof>'", "the end of the line");

			result.attr.type = "error";

			result:text("Sorry, I couldn't understand that... "..err);

			event.origin.send(result);

			return;

		end

	end

	local taskok, message = chunk();

	if not message then

		if type(taskok) ~= "string" and useglobalenv then

			taskok = session.serialize(taskok);

		end

		result:text("Result: "..tostring(taskok));

	elseif (not taskok) and message then

		result.attr.type = "error";

		result:text("Error: "..tostring(message));

	else

		result:text("OK: "..tostring(message));

	end

	event.origin.send(result);

end

module:hook("admin/repl-input", function (event)

	local ok, err = pcall(handle_line, event);

	if not ok then

		event.origin.send(st.stanza("repl-result", { type = "error" }):text(err));

	end

end);

-- Console commands --

-- These are simple commands, not valid standalone in Lua

function commands.help(session, data)

	local print = session.print;

	local section = data:match("^help (%w+)");

	if not section then

		print [[Commands are divided into multiple sections. For help on a particular section, ]]

		print [[type: help SECTION (for example, 'help c2s'). Sections are: ]]

		print [[]]

		print [[c2s - Commands to manage local client-to-server sessions]]

		print [[s2s - Commands to manage sessions between this server and others]]

		print [[http - Commands to inspect HTTP services]] -- XXX plural but there is only one so far

		print [[module - Commands to load/reload/unload modules/plugins]]

		print [[host - Commands to activate, deactivate and list virtual hosts]]

		print [[user - Commands to create and delete users, and change their passwords]]

		print [[muc - Commands to create, list and manage chat rooms]]

		print [[server - Uptime, version, shutting down, etc.]]

		print [[port - Commands to manage ports the server is listening on]]

		print [[dns - Commands to manage and inspect the internal DNS resolver]]

		print [[xmpp - Commands for sending XMPP stanzas]]

		print [[debug - Commands for debugging the server]]

		print [[config - Reloading the configuration, etc.]]

		print [[console - Help regarding the console itself]]

	elseif section == "c2s" then

		print [[c2s:show(jid) - Show all client sessions with the specified JID (or all if no JID given)]]

		print [[c2s:show_insecure() - Show all unencrypted client connections]]

		print [[c2s:show_secure() - Show all encrypted client connections]]

		print [[c2s:show_tls() - Show TLS cipher info for encrypted sessions]]

		print [[c2s:count() - Count sessions without listing them]]

		print [[c2s:close(jid) - Close all sessions for the specified JID]]

		print [[c2s:closeall() - Close all active c2s connections ]]

	elseif section == "s2s" then

		print [[s2s:show(domain) - Show all s2s connections for the given domain (or all if no domain given)]]

		print [[s2s:show_tls(domain) - Show TLS cipher info for encrypted sessions]]

		print [[s2s:close(from, to) - Close a connection from one domain to another]]

		print [[s2s:closeall(host) - Close all the incoming/outgoing s2s sessions to specified host]]

	elseif section == "http" then

		print [[http:list(hosts) - Show HTTP endpoints]]

	elseif section == "module" then

		print [[module:info(module, host) - Show information about a loaded module]]

		print [[module:load(module, host) - Load the specified module on the specified host (or all hosts if none given)]]

		print [[module:reload(module, host) - The same, but unloads and loads the module (saving state if the module supports it)]]

		print [[module:unload(module, host) - The same, but just unloads the module from memory]]

		print [[module:list(host) - List the modules loaded on the specified host]]

	elseif section == "host" then

		print [[host:activate(hostname) - Activates the specified host]]

		print [[host:deactivate(hostname) - Disconnects all clients on this host and deactivates]]

		print [[host:list() - List the currently-activated hosts]]

	elseif section == "user" then

		print [[user:create(jid, password) - Create the specified user account]]

		print [[user:password(jid, password) - Set the password for the specified user account]]

		print [[user:delete(jid) - Permanently remove the specified user account]]

		print [[user:list(hostname, pattern) - List users on the specified host, optionally filtering with a pattern]]

	elseif section == "muc" then

		-- TODO `muc:room():foo()` commands

		print [[muc:create(roomjid, { config }) - Create the specified MUC room with the given config]]

		print [[muc:list(host) - List rooms on the specified MUC component]]

		print [[muc:room(roomjid) - Create the specified MUC room with the given config]]

	elseif section == "server" then

		print [[server:version() - Show the server's version number]]

		print [[server:uptime() - Show how long the server has been running]]

		print [[server:memory() - Show details about the server's memory usage]]

		print [[server:shutdown(reason) - Shut down the server, with an optional reason to be broadcast to all connections]]

	elseif section == "port" then

		print [[port:list() - Lists all network ports prosody currently listens on]]

		print [[port:close(port, interface) - Close a port]]

	elseif section == "dns" then

		print [[dns:lookup(name, type, class) - Do a DNS lookup]]

		print [[dns:addnameserver(nameserver) - Add a nameserver to the list]]

		print [[dns:setnameserver(nameserver) - Replace the list of name servers with the supplied one]]

		print [[dns:purge() - Clear the DNS cache]]

		print [[dns:cache() - Show cached records]]

	elseif section == "xmpp" then

		print [[xmpp:ping(localhost, remotehost) -- Sends a ping to a remote XMPP server and reports the response]]

	elseif section == "config" then

		print [[config:reload() - Reload the server configuration. Modules may need to be reloaded for changes to take effect.]]

		print [[config:get([host,] option) - Show the value of a config option.]]

	elseif section == "stats" then -- luacheck: ignore 542

		-- TODO describe how stats:show() works

	elseif section == "debug" then

		print [[debug:logevents(host) - Enable logging of fired events on host]]

		print [[debug:events(host, event) - Show registered event handlers]]

		print [[debug:timers() - Show information about scheduled timers]]

	elseif section == "console" then

		print [[Hey! Welcome to Prosody's admin console.]]

		print [[First thing, if you're ever wondering how to get out, simply type 'quit'.]]

		print [[Secondly, note that we don't support the full telnet protocol yet (it's coming)]]

		print [[so you may have trouble using the arrow keys, etc. depending on your system.]]

		print [[]]

		print [[For now we offer a couple of handy shortcuts:]]

		print [[!! - Repeat the last command]]

		print [[!old!new! - repeat the last command, but with 'old' replaced by 'new']]

		print [[]]

		print [[For those well-versed in Prosody's internals, or taking instruction from those who are,]]

		print [[you can prefix a command with > to escape the console sandbox, and access everything in]]

		print [[the running server. Great fun, but be careful not to break anything :)]]

	end

end

-- Session environment --

-- Anything in def_env will be accessible within the session as a global variable

--luacheck: ignore 212/self

local serialize_defaults = module:get_option("console_prettyprint_settings", { fatal = false, unquoted = true, maxdepth = 2})

def_env.output = {};

function def_env.output:configure(opts)

	if type(opts) ~= "table" then

		opts = { preset = opts };

	end

	if not opts.fallback then

		-- XXX Error message passed to fallback is lost, does it matter?

		opts.fallback = tostring;

	end

	for k,v in pairs(serialize_defaults) do

		if opts[k] == nil then

			opts[k] = v;

		end

	end

	self.session.serialize = serialization.new(opts);

end

def_env.server = {};

function def_env.server:insane_reload()

	prosody.unlock_globals();

	dofile "prosody"

	prosody = _G.prosody;

	return true, "Server reloaded";

end

function def_env.server:version()

	return true, tostring(prosody.version or "unknown");

end

function def_env.server:uptime()

	local t = os.time()-prosody.start_time;

	local seconds = t%60;

	t = (t - seconds)/60;

	local minutes = t%60;

	t = (t - minutes)/60;

	local hours = t%24;

	t = (t - hours)/24;

	local days = t;

	return true, string.format("This server has been running for %d day%s, %d hour%s and %d minute%s (since %s)",

		days, (days ~= 1 and "s") or "", hours, (hours ~= 1 and "s") or "",

		minutes, (minutes ~= 1 and "s") or "", os.date("%c", prosody.start_time));

end

function def_env.server:shutdown(reason)

	prosody.shutdown(reason);

	return true, "Shutdown initiated";

end

local function human(kb)

	return format_number(kb*1024, "B", "b");

end

function def_env.server:memory()

	if not has_pposix or not pposix.meminfo then

		return true, "Lua is using "..human(collectgarbage("count"));

	end

	local mem, lua_mem = pposix.meminfo(), collectgarbage("count");

	local print = self.session.print;

	print("Process: "..human((mem.allocated+mem.allocated_mmap)/1024));

	print("   Used: "..human(mem.used/1024).." ("..human(lua_mem).." by Lua)");

	print("   Free: "..human(mem.unused/1024).." ("..human(mem.returnable/1024).." returnable)");

	return true, "OK";

end

def_env.module = {};

local function get_hosts_set(hosts)

	if type(hosts) == "table" then

		if hosts[1] then

			return set.new(hosts);

		elseif hosts._items then

			return hosts;

		end

	elseif type(hosts) == "string" then

		return set.new { hosts };

	elseif hosts == nil then

		return set.new(array.collect(keys(prosody.hosts)));

	end

end

-- Hosts with a module or all virtualhosts if no module given

-- matching modules_enabled in the global section

local function get_hosts_with_module(hosts, module)

	local hosts_set = get_hosts_set(hosts)

	/ function (host)

			if module then

				-- Module given, filter in hosts with this module loaded

				if modulemanager.is_loaded(host, module) then

					return host;

				else

					return nil;

				end

			end

			if not hosts then

				-- No hosts given, filter in VirtualHosts

				if prosody.hosts[host].type == "local" then

					return host;

				else

					return nil

				end

			end;

			-- No module given, but hosts are, don't filter at all

			return host;

		end;

	if module and modulemanager.get_module("*", module) then

		hosts_set:add("*");

	end

	return hosts_set;

end

function def_env.module:info(name, hosts)

	if not name then

		return nil, "module name expected";