Code files

Chapter08/web-server-hardening/koa-app/bin/www

@@ -0,0 +1,106 @@
+#!/usr/bin/env node
+
+/**
+ * Module dependencies.
+ */
+
+const app = require('../app')
+const http = require('http')
+const path = require('path')
+
+const appDir = path.resolve(__dirname, '..')
+const logDir = path.join(appDir, 'logs')
+/**
+ * make a log directory, just in case it isn't there.
+ */
+try {
+  require('fs').mkdirSync(logDir)
+} catch (e) {
+  if (e.code !== 'EEXIST') {
+    console.error('Could not set up log directory, error was: ', e)
+    process.exit(1)
+  }
+}
+const log4js = require('koa-log4')
+log4js.configure(path.join(appDir, 'log4js.json'), { cwd: logDir })
+const logger = log4js.getLogger('startup')
+/**
+ * Get port from environment and store in Express.
+ */
+
+var port = normalizePort(process.env.PORT || '3000')
+// app.set('port', port)
+
+/**
+ * Create HTTP server.
+ */
+
+var server = http.createServer(app.callback())
+
+/**
+ * Listen on provided port, on all network interfaces.
+ */
+
+server.listen(port)
+server.on('error', onError)
+server.on('listening', onListening)
+
+/**
+ * Normalize a port into a number, string, or false.
+ */
+
+function normalizePort (val) {
+  var port = parseInt(val, 10)
+
+  if (isNaN(port)) {
+    // named pipe
+    return val
+  }
+
+  if (port >= 0) {
+    // port number
+    return port
+  }
+
+  return false
+}
+
+/**
+ * Event listener for HTTP server "error" event.
+ */
+
+function onError (error) {
+  if (error.syscall !== 'listen') {
+    throw error
+  }
+
+  var bind = typeof port === 'string'
+    ? 'Pipe ' + port
+    : 'Port ' + port
+
+  // handle specific listen errors with friendly messages
+  switch (error.code) {
+    case 'EACCES':
+      logger.error(bind + ' requires elevated privileges')
+      process.exit(1)
+      break
+    case 'EADDRINUSE':
+      logger.error(bind + ' is already in use')
+      process.exit(1)
+      break
+    default:
+      throw error
+  }
+}
+
+/**
+ * Event listener for HTTP server "listening" event.
+ */
+
+function onListening () {
+  var addr = server.address()
+  var bind = typeof addr === 'string'
+    ? 'pipe ' + addr
+    : 'port ' + addr.port
+  logger.info('Listening on ' + bind)
+}