module("dependencies", package.seeall)

function softreq(...) local ok, lib =  pcall(require, ...); if ok then return lib; else return nil, lib; end end

function missingdep(name, sources, msg)

function check_dependencies()

	local fatal;

	local lxp = softreq "lxp"

	if not lxp then

		missingdep("luaexpat", {

				["Debian/Ubuntu"] = "sudo apt-get install liblua5.1-expat0";

				["luarocks"] = "luarocks install luaexpat";

				["Source"] = "http://www.keplerproject.org/luaexpat/";

			});

		fatal = true;

	end

	local socket = softreq "socket"

	if not socket then

		missingdep("luasocket", {

				["Debian/Ubuntu"] = "sudo apt-get install liblua5.1-socket2";

				["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 liblua5.1-filesystem0";

		 		["Source"] = "http://www.keplerproject.org/luafilesystem/";

		 	});

		fatal = true;

	end

	local ssl = softreq "ssl"

	if not ssl then

		if config.get("*", "core", "run_without_ssl") then

			log("warn", "Running without SSL support because run_without_ssl is defined in the config");

		else

			missingdep("LuaSec", {

					["Debian/Ubuntu"] = "http://prosody.im/download/start#debian_and_ubuntu";

					["luarocks"] = "luarocks install luasec";

					["Source"] = "http://www.inf.puc-rio.br/~brunoos/luasec/";

				}, "SSL/TLS support will not be available");

		end

	else

		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

			log("error", "This version of LuaSec contains a known bug that causes disconnects, see http://prosody.im/doc/depends");

		end

	end

	local encodings, err = softreq "util.encodings"

	if not encodings then

		if err:match("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("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;

return _M;