src/notify/email.lua

local smtp = require"socket.smtp";
local url = require"socket.url";
local uuid = require"util.uuid";

local function send_email(cfg, to, headers, content)
	if type(headers) == "string" then
		headers = {
			Subject = headers;
			From = ('"%s" <%s>'):format(cfg.project.name, cfg.smtp.origin);
		};
	end
	if not headers["Message-ID"] then
		local namespace = url.parse(cfg.base_url or "http://localhost/").host;
		headers["Message-ID"] = ("<%s@%s>"):format(uuid.generate(), namespace);
	end
	headers.To = to;
	headers["Content-Type"] = 'text/plain; charset="utf-8"';
	local message = smtp.message{
		headers = headers;
		body = content;
	};

	if cfg.smtp.exec then
		local pipe = io.popen(cfg.smtp.exec ..
			" '"..to:gsub("'", "'\\''").."'", "w");

		for str in message do
			pipe:write(str);
		end

		return pipe:close();
	end

	return smtp.send({
		user = cfg.smtp.user; password = cfg.smtp.password;
		server = cfg.smtp.server; port = cfg.smtp.port;
		domain = cfg.smtp.domain;

		from = cfg.smtp.origin; rcpt = to;
		source = message;
	});
end

return {
	send = send_email;
};