File

util/dependencies.lua @ 9273:f2258e9750cf

mod_vcard_legacy: Include avatar data even if metadata can't be loaded Normally both nodes should have the same configuration and matching items, but we can't depend on it without having some code that enforces it, which does not exist at the time of this commit. Including the avatar itself should be prioritised. The image format can be derived from magic bytes.
author Kim Alvefur <zash@zash.se>
date Fri, 07 Sep 2018 01:08:27 +0200 (2018-09-06)
parent 8235:7d9a2c200736
child 9494:b19f676203fd
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-- 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 function softreq(...) local ok, lib =  pcall(require, ...); if ok then return lib; else return nil, lib; end end

-- Required to be able to find packages installed with luarocks
if not softreq "luarocks.loader" then -- LuaRocks 2.x
	softreq "luarocks.require"; -- LuaRocks <1.x
end

local function missingdep(name, sources, msg)
	print("");
	print("**************************");
	print("Prosody was unable to find "..tostring(name));
	print("This package can be obtained in the following ways:");
	print("");
	local longest_platform = 0;
	for platform in pairs(sources) do
		longest_platform = math.max(longest_platform, #platform);
	end
	for platform, source in pairs(sources) do
		print("", platform..":"..(" "):rep(4+longest_platform-#platform)..source);
	end
	print("");
	print(msg or (name.." is required for Prosody to run, so we will now exit."));
	print("More help can be found on our website, at https://prosody.im/doc/depends");
	print("**************************");
	print("");
end

-- COMPAT w/pre-0.8 Debian: The Debian config file used to use
-- util.ztact, which has been removed from Prosody in 0.8. This
-- is to log an error for people who still use it, so they can
-- update their configs.
package.preload["util.ztact"] = function ()
	if not package.loaded["core.loggingmanager"] then
		error("util.ztact has been removed from Prosody and you need to fix your config "
		    .."file. More information can be found at https://prosody.im/doc/packagers#ztact", 0);
	else
		error("module 'util.ztact' has been deprecated in Prosody 0.8.");
	end
end;

local function check_dependencies()
	if _VERSION < "Lua 5.1" then
		print "***********************************"
		print("Unsupported Lua version: ".._VERSION);
		print("At least Lua 5.1 is required.");
		print "***********************************"
		return false;
	end

	local fatal;

	local lxp = softreq "lxp"

	if not lxp then
		missingdep("luaexpat", {
				["Debian/Ubuntu"] = "sudo apt-get install lua-expat";
				["luarocks"] = "luarocks install luaexpat";
				["Source"] = "http://matthewwild.co.uk/projects/luaexpat/";
			});
		fatal = true;
	end

	local socket = softreq "socket"

	if not socket then
		missingdep("luasocket", {
				["Debian/Ubuntu"] = "sudo apt-get install lua-socket";
				["luarocks"] = "luarocks install luasocket";
				["Source"] = "http://www.tecgraf.puc-rio.br/~diego/professional/luasocket/";
			});
		fatal = true;
	end

	local lfs, err = softreq "lfs"
	if not lfs then
		missingdep("luafilesystem", {
			["luarocks"] = "luarocks install luafilesystem";
			["Debian/Ubuntu"] = "sudo apt-get install lua-filesystem";
			["Source"] = "http://www.keplerproject.org/luafilesystem/";
		});
		fatal = true;
	end

	local ssl = softreq "ssl"

	if not ssl then
		missingdep("LuaSec", {
				["Debian/Ubuntu"] = "sudo apt-get install lua-sec";
				["luarocks"] = "luarocks install luasec";
				["Source"] = "https://github.com/brunoos/luasec";
			}, "SSL/TLS support will not be available");
	end

	local bit = _G.bit32 or softreq"bit";

	if not bit then
		missingdep("lua-bitops", {
			["Debian/Ubuntu"] = "sudo apt-get install lua-bitop";
			["luarocks"] = "luarocks install luabitop";
			["Source"] = "http://bitop.luajit.org/";
		}, "WebSocket support will not be available");
	end

	local encodings, err = softreq "util.encodings"
	if not encodings then
		if err:match("module '[^']*' not found") then
			missingdep("util.encodings", {
				["Windows"] = "Make sure you have encodings.dll from the Prosody distribution in util/";
				["GNU/Linux"] = "Run './configure' and 'make' in the Prosody source directory to build util/encodings.so";
			});
		else
			print "***********************************"
			print("util/encodings couldn't be loaded. Check that you have a recent version of libidn");
			print ""
			print("The full error was:");
			print(err)
			print "***********************************"
		end
		fatal = true;
	end

	local hashes, err = softreq "util.hashes"
	if not hashes then
		if err:match("module '[^']*' not found") then
			missingdep("util.hashes", {
				["Windows"] = "Make sure you have hashes.dll from the Prosody distribution in util/";
				["GNU/Linux"] = "Run './configure' and 'make' in the Prosody source directory to build util/hashes.so";
			});
		else
			print "***********************************"
			print("util/hashes couldn't be loaded. Check that you have a recent version of OpenSSL (libcrypto in particular)");
			print ""
			print("The full error was:");
			print(err)
			print "***********************************"
		end
		fatal = true;
	end

	return not fatal;
end

local function log_warnings()
	if _VERSION > "Lua 5.2" then
		prosody.log("warn", "Support for %s is experimental, please report any issues", _VERSION);
	end
	local ssl = softreq"ssl";
	if ssl then
		local major, minor, veryminor, patched = ssl._VERSION:match("(%d+)%.(%d+)%.?(%d*)(M?)");
		if not major or ((tonumber(major) == 0 and (tonumber(minor) or 0) <= 3 and (tonumber(veryminor) or 0) <= 2) and patched ~= "M") then
			prosody.log("error", "This version of LuaSec contains a known bug that causes disconnects, see https://prosody.im/doc/depends");
		end
	end
	local lxp = softreq"lxp";
	if lxp then
		if not pcall(lxp.new, { StartDoctypeDecl = false }) then
			prosody.log("error", "The version of LuaExpat on your system leaves Prosody "
				.."vulnerable to denial-of-service attacks. You should upgrade to "
				.."LuaExpat 1.3.0 or higher as soon as possible. See "
				.."https://prosody.im/doc/depends#luaexpat for more information.");
		end
		if not lxp.new({}).getcurrentbytecount then
			prosody.log("error", "The version of LuaExpat on your system does not support "
				.."stanza size limits, which may leave servers on untrusted "
				.."networks (e.g. the internet) vulnerable to denial-of-service "
				.."attacks. You should upgrade to LuaExpat 1.3.0 or higher as "
				.."soon as possible. See "
				.."https://prosody.im/doc/depends#luaexpat for more information.");
		end
	end
end

return {
	softreq = softreq;
	missingdep = missingdep;
	check_dependencies = check_dependencies;
	log_warnings = log_warnings;
};