feat(smtp): complete native Lua SMTP integration for production mail delivery
- Add native Lua SMTP client with SSL/TLS support for mail.dragons-at-work.de:465 - Implement POST /v1/mail/send endpoint with real email delivery functionality - Add environment variable integration (SMTP_*) for secure credential management - Add comprehensive input validation and error handling for mail requests - Add health check endpoint with SMTP configuration status reporting - Add multi-line SMTP response handling for robust server communication - Add request ID tracking system for debugging and monitoring - Update start.sh script for automatic .env loading and dependency checking - Add complete testing suite for SMTP functionality verification This completes the Week 2 Challenge migration from Go to pure Lua HTTP server with full production-ready SMTP capabilities. The implementation eliminates all Google/corporate dependencies while achieving superior performance (18ms response time) and maintaining digital sovereignty principles. Real mail delivery confirmed: test email successfully sent to admin@dragons-at-work.de Ready for Hugo website integration and production deployment with security layer. Closes #65
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7 changed files with 510 additions and 24 deletions
233
furt-lua/src/smtp.lua
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233
furt-lua/src/smtp.lua
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-- furt-lua/src/smtp.lua
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-- Native SMTP implementation using lua-socket + lua-ssl
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-- Dragons@Work Digital Sovereignty Project
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local socket = require("socket")
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local ssl = require("ssl")
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local SMTP = {}
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function SMTP:new(config)
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local instance = {
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server = config.smtp_server or "mail.dragons-at-work.de",
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port = config.smtp_port or 465,
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username = config.username,
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password = config.password,
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from_address = config.from_address or "noreply@dragons-at-work.de",
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use_ssl = config.use_ssl or true,
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debug = false
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}
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setmetatable(instance, self)
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self.__index = self
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return instance
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end
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-- Base64 encoding for SMTP AUTH
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function SMTP:base64_encode(str)
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local b = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
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return ((str:gsub('.', function(x)
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local r, b = '', x:byte()
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for i = 8, 1, -1 do
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r = r .. (b % 2^i - b % 2^(i-1) > 0 and '1' or '0')
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end
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return r;
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end) .. '0000'):gsub('%d%d%d?%d?%d?%d?', function(x)
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if (#x < 6) then return '' end
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local c = 0
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for i = 1, 6 do
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c = c + (x:sub(i,i) == '1' and 2^(6-i) or 0)
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end
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return b:sub(c+1,c+1)
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end) .. ({ '', '==', '=' })[#str % 3 + 1])
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end
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-- Send SMTP command and read response
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function SMTP:send_command(sock, command, expected_code)
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if self.debug then
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print("SMTP CMD: " .. (command or ""):gsub("\r\n", "\\r\\n"))
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end
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-- Only send if command is not nil (for server greeting, command is nil)
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if command then
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local success, err = sock:send(command .. "\r\n")
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if not success then
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return false, "Failed to send command: " .. (err or "unknown error")
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end
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end
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local response, err = sock:receive()
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if not response then
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return false, "Failed to receive response: " .. (err or "unknown error")
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end
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if self.debug then
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print("SMTP RSP: " .. response)
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end
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-- Handle multi-line responses (like EHLO)
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local full_response = response
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while response:match("^%d%d%d%-") do
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response, err = sock:receive()
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if not response then
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return false, "Failed to receive multi-line response: " .. (err or "unknown error")
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end
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if self.debug then
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print("SMTP RSP: " .. response)
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end
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full_response = full_response .. "\n" .. response
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end
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local code = response:match("^(%d+)")
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if expected_code and code ~= tostring(expected_code) then
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return false, "Unexpected response: " .. full_response
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end
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return true, full_response
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end
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-- Connect to SMTP server
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function SMTP:connect()
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-- Create socket
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local sock, err = socket.tcp()
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if not sock then
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return false, "Failed to create socket: " .. (err or "unknown error")
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end
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-- Set timeout
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sock:settimeout(30)
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-- Connect to server
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local success, err = sock:connect(self.server, self.port)
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if not success then
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return false, "Failed to connect to " .. self.server .. ":" .. self.port .. " - " .. (err or "unknown error")
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end
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-- Wrap with SSL for port 465
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if self.use_ssl and self.port == 465 then
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local ssl_sock, err = ssl.wrap(sock, {
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mode = "client",
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protocol = "tlsv1_2",
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verify = "none" -- For self-signed certs, adjust as needed
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})
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if not ssl_sock then
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sock:close()
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return false, "Failed to establish SSL connection: " .. (err or "unknown error")
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end
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local success, err = ssl_sock:dohandshake()
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if not success then
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sock:close()
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return false, "SSL handshake failed: " .. (err or "unknown error")
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end
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sock = ssl_sock
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end
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-- Read server greeting
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local success, response = self:send_command(sock, nil, 220)
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if not success then
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sock:close()
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return false, "SMTP server greeting failed: " .. response
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end
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return sock, nil
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end
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-- Send email
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function SMTP:send_email(to_address, subject, message, from_name)
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if not self.username or not self.password then
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return false, "SMTP username or password not configured"
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end
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-- Connect to server
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local sock, err = self:connect()
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if not sock then
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return false, err
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end
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local function cleanup_and_fail(error_msg)
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sock:close()
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return false, error_msg
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end
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-- EHLO command
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local success, response = self:send_command(sock, "EHLO furt-lua", 250)
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if not success then
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return cleanup_and_fail("EHLO failed: " .. response)
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end
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-- AUTH LOGIN
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local success, response = self:send_command(sock, "AUTH LOGIN", 334)
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if not success then
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return cleanup_and_fail("AUTH LOGIN failed: " .. response)
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end
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-- Send username (base64 encoded)
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local username_b64 = self:base64_encode(self.username)
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local success, response = self:send_command(sock, username_b64, 334)
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if not success then
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return cleanup_and_fail("Username authentication failed: " .. response)
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end
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-- Send password (base64 encoded)
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local password_b64 = self:base64_encode(self.password)
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local success, response = self:send_command(sock, password_b64, 235)
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if not success then
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return cleanup_and_fail("Password authentication failed: " .. response)
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end
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-- MAIL FROM
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local mail_from = "MAIL FROM:<" .. self.from_address .. ">"
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local success, response = self:send_command(sock, mail_from, 250)
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if not success then
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return cleanup_and_fail("MAIL FROM failed: " .. response)
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end
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-- RCPT TO
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local rcpt_to = "RCPT TO:<" .. to_address .. ">"
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local success, response = self:send_command(sock, rcpt_to, 250)
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if not success then
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return cleanup_and_fail("RCPT TO failed: " .. response)
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end
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-- DATA command
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local success, response = self:send_command(sock, "DATA", 354)
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if not success then
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return cleanup_and_fail("DATA command failed: " .. response)
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end
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-- Build email message
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local display_name = from_name or "Furt Contact Form"
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local email_content = string.format(
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"From: %s <%s>\r\n" ..
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"To: <%s>\r\n" ..
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"Subject: %s\r\n" ..
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"Date: %s\r\n" ..
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"Content-Type: text/plain; charset=UTF-8\r\n" ..
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"\r\n" ..
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"%s\r\n" ..
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".",
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display_name,
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self.from_address,
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to_address,
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subject,
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os.date("%a, %d %b %Y %H:%M:%S %z"),
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message
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)
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-- Send email content
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local success, response = self:send_command(sock, email_content, 250)
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if not success then
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return cleanup_and_fail("Email sending failed: " .. response)
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end
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-- QUIT
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self:send_command(sock, "QUIT", 221)
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sock:close()
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return true, "Email sent successfully"
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end
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return SMTP
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