local configmanager = require "core.configmanager";

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

local ssl = ssl;

local ssl_newcontext = ssl and ssl.newcontext;

local setmetatable, tostring = setmetatable, tostring;

local prosody = prosody;

module "certmanager"

-- These are the defaults if not overridden in the config

local default_ssl_ctx = { mode = "client", protocol = "sslv23", capath = "/etc/ssl/certs", verify = "none", options = "no_sslv2"; };

local default_ssl_ctx_in = { mode = "server", protocol = "sslv23", capath = "/etc/ssl/certs", verify = "none", options = "no_sslv2"; };

local default_ssl_ctx_mt = { __index = default_ssl_ctx };

local default_ssl_ctx_in_mt = { __index = default_ssl_ctx_in };

-- Global SSL options if not overridden per-host

local default_ssl_config = configmanager.get("*", "core", "ssl");

function create_context(host, mode, config)

	local ssl_config = config and config.core.ssl or default_ssl_config;

	if ssl and ssl_config then

		local ctx, err = ssl_newcontext(setmetatable(ssl_config, mode == "client" and default_ssl_ctx_mt or default_ssl_ctx_in_mt));

		if not ctx then

			err = err or "invalid ssl config"

			local file = err:match("^error loading (.-) %(");

			if file then

				if file == "private key" then

					file = ssl_config.key or "your private key";

				elseif file == "certificate" then

					file = ssl_config.certificate or "your certificate file";

				end

				local reason = err:match("%((.+)%)$") or "some reason";

				if reason == "Permission denied" then

					reason = "Check that the permissions allow Prosody to read this file.";

				elseif reason == "No such file or directory" then

					reason = "Check that the path is correct, and the file exists.";

				elseif reason == "system lib" then

					reason = "Previous error (see logs), or other system error.";

				elseif reason == "(null)" or not reason then

					reason = "Check that the file exists and the permissions are correct";

				else

					reason = "Reason: "..tostring(reason):lower();

				end

				log("error", "SSL/TLS: Failed to load %s: %s", file, reason);

			else

				log("error", "SSL/TLS: Error initialising for host %s: %s", host, err );

			end

        	end

        	return ctx, err;

	end

end

function reload_ssl_config()

	default_ssl_config = configmanager.get("*", "core", "ssl");

end

prosody.events.add_handler("config-reloaded", reload_ssl_config);

return _M;