Code files

Chapter05/creating-an-smtp-server/smtp-client/index.js

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+'use strict'
+
+const os = require('os')
+const readline = require('readline')
+const smtp = require('smtp-protocol')
+
+const rl = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout,
+  prompt: ''
+})
+
+const cfg = {
+  host: 'localhost',
+  port: 2525,
+  email: 'me@me.com',
+  hostname: os.hostname()
+}
+
+rl.on('SIGINT', () => {
+  console.log('... cancelled ...')
+  process.exit()
+})
+
+smtp.connect(cfg.host, cfg.port, (mail) => {
+  mail.helo(cfg.hostname)
+  mail.from(cfg.email)
+  rl.question('To: ', (to) => {
+    to.split(/;|,/gm).forEach((rcpt) => {
+      rcpt = rcpt.trim()
+      mail.to(rcpt, (err, code, lines) => {
+        exitOnFail(err, code, lines, {rcpt: rcpt})
+      })
+    })
+    rl.write('===== Message (^D to send) =====\n')
+    mail.data(exitOnFail)
+    const body = []
+    rl.on('line', (line) => body.push(`${line}\r\n`))
+    rl.on('close', () => send(mail, body))
+  })
+})
+
+function send (mail, body) {
+  console.log('... sending ...')
+  const message = mail.message()
+  body.forEach(message.write, message)
+  message.end()
+  mail.quit()
+}
+
+function exitOnFail (err, code, lines, info) {
+  if (code === 550) {
+    err = Error(`No Mailbox for Recipient "${info.rcpt}"`)
+  }
+  if (!err && code !== 354 && code !== 250 && code !== 220 && code !== 200) {
+    err = Error(`Protocol Error: ${code} ${lines.join('')}`)
+  }
+  if (!err) return
+  console.error(err.message)
+  process.exit(1)
+}

Chapter05/creating-an-smtp-server/smtp-client/package.json

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+{
+  "name": "smtp-client",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "smtp-protocol": "^2.4.7"
+  }
+}