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Dir : ~/var/www/invoice/node_modules/serve-static/

Edit File: index.js

/*!
 * serve-static
 * Copyright(c) 2010 Sencha Inc.
 * Copyright(c) 2011 TJ Holowaychuk
 * Copyright(c) 2014-2016 Douglas Christopher Wilson
 * MIT Licensed
 */

'use strict'

/**
 * Module dependencies.
 * @private
 */

var encodeUrl = require('encodeurl')
var escapeHtml = require('escape-html')
var parseUrl = require('parseurl')
var resolve = require('path').resolve
var send = require('send')
var url = require('url')

/**
 * Module exports.
 * @public
 */

module.exports = serveStatic
module.exports.mime = send.mime

/**
 * @param {string} root
 * @param {object} [options]
 * @return {function}
 * @public
 */

function serveStatic (root, options) {
  if (!root) {
    throw new TypeError('root path required')
  }

if (typeof root !== 'string') {
    throw new TypeError('root path must be a string')
  }

// copy options object
  var opts = Object.create(options || null)

// fall-though
  var fallthrough = opts.fallthrough !== false

// default redirect
  var redirect = opts.redirect !== false

// headers listener
  var setHeaders = opts.setHeaders

if (setHeaders && typeof setHeaders !== 'function') {
    throw new TypeError('option setHeaders must be function')
  }

// setup options for send
  opts.maxage = opts.maxage || opts.maxAge || 0
  opts.root = resolve(root)

// construct directory listener
  var onDirectory = redirect
    ? createRedirectDirectoryListener()
    : createNotFoundDirectoryListener()

return function serveStatic (req, res, next) {
    if (req.method !== 'GET' && req.method !== 'HEAD') {
      if (fallthrough) {
        return next()
      }

// method not allowed
      res.statusCode = 405
      res.setHeader('Allow', 'GET, HEAD')
      res.setHeader('Content-Length', '0')
      res.end()
      return
    }

var forwardError = !fallthrough
    var originalUrl = parseUrl.original(req)
    var path = parseUrl(req).pathname

// make sure redirect occurs at mount
    if (path === '/' && originalUrl.pathname.substr(-1) !== '/') {
      path = ''
    }

// create send stream
    var stream = send(req, path, opts)

// add directory handler
    stream.on('directory', onDirectory)

// add headers listener
    if (setHeaders) {
      stream.on('headers', setHeaders)
    }

// add file listener for fallthrough
    if (fallthrough) {
      stream.on('file', function onFile () {
        // once file is determined, always forward error
        forwardError = true
      })
    }

// forward errors
    stream.on('error', function error (err) {
      if (forwardError || !(err.statusCode < 500)) {
        next(err)
        return
      }

next()
    })

// pipe
    stream.pipe(res)
  }
}

/**
 * Collapse all leading slashes into a single slash
 * @private
 */
function collapseLeadingSlashes (str) {
  for (var i = 0; i < str.length; i++) {
    if (str.charCodeAt(i) !== 0x2f /* / */) {
      break
    }
  }

return i > 1
    ? '/' + str.substr(i)
    : str
}

/**
 * Create a minimal HTML document.
 *
 * @param {string} title
 * @param {string} body
 * @private
 */

function createHtmlDocument (title, body) {
  return '<!DOCTYPE html>\n' +
    '<html lang="en">\n' +
    '<head>\n' +
    '<meta charset="utf-8">\n' +
    '<title>' + title + '</title>\n' +
    '</head>\n' +
    '<body>\n' +
    '<pre>' + body + '</pre>\n' +
    '</body>\n' +
    '</html>\n'
}

/**
 * Create a directory listener that just 404s.
 * @private
 */

function createNotFoundDirectoryListener () {
  return function notFound () {
    this.error(404)
  }
}

/**
 * Create a directory listener that performs a redirect.
 * @private
 */

function createRedirectDirectoryListener () {
  return function redirect (res) {
    if (this.hasTrailingSlash()) {
      this.error(404)
      return
    }

// get original URL
    var originalUrl = parseUrl.original(this.req)

// append trailing slash
    originalUrl.path = null
    originalUrl.pathname = collapseLeadingSlashes(originalUrl.pathname + '/')

// reformat the URL
    var loc = encodeUrl(url.format(originalUrl))
    var doc = createHtmlDocument('Redirecting', 'Redirecting to <a href="' + escapeHtml(loc) + '">' +
      escapeHtml(loc) + '</a>')

// send redirect response
    res.statusCode = 301
    res.setHeader('Content-Type', 'text/html; charset=UTF-8')
    res.setHeader('Content-Length', Buffer.byteLength(doc))
    res.setHeader('Content-Security-Policy', "default-src 'none'")
    res.setHeader('X-Content-Type-Options', 'nosniff')
    res.setHeader('Location', loc)
    res.end(doc)
  }
}