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/*!
 * send
 * Copyright(c) 2012 TJ Holowaychuk
 * Copyright(c) 2014-2022 Douglas Christopher Wilson
 * MIT Licensed
 */

'use strict'

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

var createError = require('http-errors')
var debug = require('debug')('send')
var deprecate = require('depd')('send')
var destroy = require('destroy')
var encodeUrl = require('encodeurl')
var escapeHtml = require('escape-html')
var etag = require('etag')
var fresh = require('fresh')
var fs = require('fs')
var mime = require('mime')
var ms = require('ms')
var onFinished = require('on-finished')
var parseRange = require('range-parser')
var path = require('path')
var statuses = require('statuses')
var Stream = require('stream')
var util = require('util')

/**
 * Path function references.
 * @private
 */

var extname = path.extname
var join = path.join
var normalize = path.normalize
var resolve = path.resolve
var sep = path.sep

/**
 * Regular expression for identifying a bytes Range header.
 * @private
 */

var BYTES_RANGE_REGEXP = /^ *bytes=/

/**
 * Maximum value allowed for the max age.
 * @private
 */

var MAX_MAXAGE = 60 * 60 * 24 * 365 * 1000 // 1 year

/**
 * Regular expression to match a path with a directory up component.
 * @private
 */

var UP_PATH_REGEXP = /(?:^|[\\/])\.\.(?:[\\/]|$)/

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

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

/**
 * Return a `SendStream` for `req` and `path`.
 *
 * @param {object} req
 * @param {string} path
 * @param {object} [options]
 * @return {SendStream}
 * @public
 */

function send (req, path, options) {
  return new SendStream(req, path, options)
}

/**
 * Initialize a `SendStream` with the given `path`.
 *
 * @param {Request} req
 * @param {String} path
 * @param {object} [options]
 * @private
 */

function SendStream (req, path, options) {
  Stream.call(this)

  var opts = options || {}

  this.options = opts
  this.path = path
  this.req = req

  this._acceptRanges = opts.acceptRanges !== undefined
    ? Boolean(opts.acceptRanges)
    : true

  this._cacheControl = opts.cacheControl !== undefined
    ? Boolean(opts.cacheControl)
    : true

  this._etag = opts.etag !== undefined
    ? Boolean(opts.etag)
    : true

  this._dotfiles = opts.dotfiles !== undefined
    ? opts.dotfiles
    : 'ignore'

  if (this._dotfiles !== 'ignore' && this._dotfiles !== 'allow' && this._dotfiles !== 'deny') {
    throw new TypeError('dotfiles option must be "allow", "deny", or "ignore"')
  }

  this._hidden = Boolean(opts.hidden)

  if (opts.hidden !== undefined) {
    deprecate('hidden: use dotfiles: \'' + (this._hidden ? 'allow' : 'ignore') + '\' instead')
  }

  // legacy support
  if (opts.dotfiles === undefined) {
    this._dotfiles = undefined
  }

  this._extensions = opts.extensions !== undefined
    ? normalizeList(opts.extensions, 'extensions option')
    : []

  this._immutable = opts.immutable !== undefined
    ? Boolean(opts.immutable)
    : false

  this._index = opts.index !== undefined
    ? normalizeList(opts.index, 'index option')
    : ['index.html']

  this._lastModified = opts.lastModified !== undefined
    ? Boolean(opts.lastModified)
    : true

  this._maxage = opts.maxAge || opts.maxage
  this._maxage = typeof this._maxage === 'string'
    ? ms(this._maxage)
    : Number(this._maxage)
  this._maxage = !isNaN(this._maxage)
    ? Math.min(Math.max(0, this._maxage), MAX_MAXAGE)
    : 0

  this._root = opts.root
    ? resolve(opts.root)
    : null

  if (!this._root && opts.from) {
    this.from(opts.from)
  }
}

/**
 * Inherits from `Stream`.
 */

util.inherits(SendStream, Stream)

/**
 * Enable or disable etag generation.
 *
 * @param {Boolean} val
 * @return {SendStream}
 * @api public
 */

SendStream.prototype.etag = deprecate.function(function etag (val) {
  this._etag = Boolean(val)
  debug('etag %s', this._etag)
  return this
}, 'send.etag: pass etag as option')

/**
 * Enable or disable "hidden" (dot) files.
 *
 * @param {Boolean} path
 * @return {SendStream}
 * @api public
 */

SendStream.prototype.hidden = deprecate.function(function hidden (val) {
  this._hidden = Boolean(val)
  this._dotfiles = undefined
  debug('hidden %s', this._hidden)
  return this
}, 'send.hidden: use dotfiles option')

/**
 * Set index `paths`, set to a falsy
 * value to disable index support.
 *
 * @param {String|Boolean|Array} paths
 * @return {SendStream}
 * @api public
 */

SendStream.prototype.index = deprecate.function(function index (paths) {
  var index = !paths ? [] : normalizeList(paths, 'paths argument')
  debug('index %o', paths)
  this._index = index
  return this
}, 'send.index: pass index as option')

/**
 * Set root `path`.
 *
 * @param {String} path
 * @return {SendStream}
 * @api public
 */

SendStream.prototype.root = function root (path) {
  this._root = resolve(String(path))
  debug('root %s', this._root)
  return this
}

SendStream.prototype.from = deprecate.function(SendStream.prototype.root,
  'send.from: pass root as option')

SendStream.prototype.root = deprecate.function(SendStream.prototype.root,
  'send.root: pass root as option')

/**
 * Set max-age to `maxAge`.
 *
 * @param {Number} maxAge
 * @return {SendStream}
 * @api public
 */

SendStream.prototype.maxage = deprecate.function(function maxage (maxAge) {
  this._maxage = typeof maxAge === 'string'
    ? ms(maxAge)
    : Number(maxAge)
  this._maxage = !isNaN(this._maxage)
    ? Math.min(Math.max(0, this._maxage), MAX_MAXAGE)
    : 0
  debug('max-age %d', this._maxage)
  return this
}, 'send.maxage: pass maxAge as option')

/**
 * Emit error with `status`.
 *
 * @param {number} status
 * @param {Error} [err]
 * @private
 */

SendStream.prototype.error = function error (status, err) {
  // emit if listeners instead of responding
  if (hasListeners(this, 'error')) {
    return this.emit('error', createHttpError(status, err))
  }

  var res = this.res
  var msg = statuses.message[status] || String(status)
  var doc = createHtmlDocument('Error', escapeHtml(msg))

  // clear existing headers
  clearHeaders(res)

  // add error headers
  if (err && err.headers) {
    setHeaders(res, err.headers)
  }

  // send basic response
  res.statusCode = status
  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.end(doc)
}

/**
 * Check if the pathname ends with "/".
 *
 * @return {boolean}
 * @private
 */

SendStream.prototype.hasTrailingSlash = function hasTrailingSlash () {
  return this.path[this.path.length - 1] === '/'
}

/**
 * Check if this is a conditional GET request.
 *
 * @return {Boolean}
 * @api private
 */

SendStream.prototype.isConditionalGET = function isConditionalGET () {
  return this.req.headers['if-match'] ||
    this.req.headers['if-unmodified-since'] ||
    this.req.headers['if-none-match'] ||
    this.req.headers['if-modified-since']
}

/**
 * Check if the request preconditions failed.
 *
 * @return {boolean}
 * @private
 */

SendStream.prototype.isPreconditionFailure = function isPreconditionFailure () {
  var req = this.req
  var res = this.res

  // if-match
  var match = req.headers['if-match']
  if (match) {
    var etag = res.getHeader('ETag')
    return !etag || (match !== '*' && parseTokenList(match).every(function (match) {
      return match !== etag && match !== 'W/' + etag && 'W/' + match !== etag
    }))
  }

  // if-unmodified-since
  var unmodifiedSince = parseHttpDate(req.headers['if-unmodified-since'])
  if (!isNaN(unmodifiedSince)) {
    var lastModified = parseHttpDate(res.getHeader('Last-Modified'))
    return isNaN(lastModified) || lastModified > unmodifiedSince
  }

  return false
}

/**
 * Strip various content header fields for a change in entity.
 *
 * @private
 */

SendStream.prototype.removeContentHeaderFields = function removeContentHeaderFields () {
  var res = this.res

  res.removeHeader('Content-Encoding')
  res.removeHeader('Content-Language')
  res.removeHeader('Content-Length')
  res.removeHeader('Content-Range')
  res.removeHeader('Content-Type')
}

/**
 * Respond with 304 not modified.
 *
 * @api private
 */

SendStream.prototype.notModified = function notModified () {
  var res = this.res
  debug('not modified')
  this.removeContentHeaderFields()
  res.statusCode = 304
  res.end()
}

/**
 * Raise error that headers already sent.
 *
 * @api private
 */

SendStream.prototype.headersAlreadySent = function headersAlreadySent () {
  var err = new Error('Can\'t set headers after they are sent.')
  debug('headers already sent')
  this.error(500, err)
}

/**
 * Check if the request is cacheable, aka
 * responded with 2xx or 304 (see RFC 2616 section 14.2{5,6}).
 *
 * @return {Boolean}
 * @api private
 */

SendStream.prototype.isCachable = function isCachable () {
  var statusCode = this.res.statusCode
  return (statusCode >= 200 && statusCode < 300) ||
    statusCode === 304
}

/**
 * Handle stat() error.
 *
 * @param {Error} error
 * @private
 */

SendStream.prototype.onStatError = function onStatError (error) {
  switch (error.code) {
    case 'ENAMETOOLONG':
    case 'ENOENT':
    case 'ENOTDIR':
      this.error(404, error)
      break
    default:
      this.error(500, error)
      break
  }
}

/**
 * Check if the cache is fresh.
 *
 * @return {Boolean}
 * @api private
 */

SendStream.prototype.isFresh = function isFresh () {
  return fresh(this.req.headers, {
    etag: this.res.getHeader('ETag'),
    'last-modified': this.res.getHeader('Last-Modified')
  })
}

/**
 * Check if the range is fresh.
 *
 * @return {Boolean}
 * @api private
 */

SendStream.prototype.isRangeFresh = function isRangeFresh () {
  var ifRange = this.req.headers['if-range']

  if (!ifRange) {
    return true
  }

  // if-range as etag
  if (ifRange.indexOf('"') !== -1) {
    var etag = this.res.getHeader('ETag')
    return Boolean(etag && ifRange.indexOf(etag) !== -1)
  }

  // if-range as modified date
  var lastModified = this.res.getHeader('Last-Modified')
  return parseHttpDate(lastModified) <= parseHttpDate(ifRange)
}

/**
 * Redirect to path.
 *
 * @param {string} path
 * @private
 */

SendStream.prototype.redirect = function redirect (path) {
  var res = this.res

  if (hasListeners(this, 'directory')) {
    this.emit('directory', res, path)
    return
  }

  if (this.hasTrailingSlash()) {
    this.error(403)
    return
  }

  var loc = encodeUrl(collapseLeadingSlashes(this.path + '/'))
  var doc = createHtmlDocument('Redirecting', 'Redirecting to ' + escapeHtml(loc))

  // redirect
  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)
}

/**
 * Pipe to `res.
 *
 * @param {Stream} res
 * @return {Stream} res
 * @api public
 */

SendStream.prototype.pipe = function pipe (res) {
  // root path
  var root = this._root

  // references
  this.res = res

  // decode the path
  var path = decode(this.path)
  if (path === -1) {
    this.error(400)
    return res
  }

  // null byte(s)
  if (~path.indexOf('\0')) {
    this.error(400)
    return res
  }

  var parts
  if (root !== null) {
    // normalize
    if (path) {
      path = normalize('.' + sep + path)
    }

    // malicious path
    if (UP_PATH_REGEXP.test(path)) {
      debug('malicious path "%s"', path)
      this.error(403)
      return res
    }

    // explode path parts
    parts = path.split(sep)

    // join / normalize from optional root dir
    path = normalize(join(root, path))
  } else {
    // ".." is malicious without "root"
    if (UP_PATH_REGEXP.test(path)) {
      debug('malicious path "%s"', path)
      this.error(403)
      return res
    }

    // explode path parts
    parts = normalize(path).split(sep)

    // resolve the path
    path = resolve(path)
  }

  // dotfile handling
  if (containsDotFile(parts)) {
    var access = this._dotfiles

    // legacy support
    if (access === undefined) {
      access = parts[parts.length - 1][0] === '.'
        ? (this._hidden ? 'allow' : 'ignore')
        : 'allow'
    }

    debug('%s dotfile "%s"', access, path)
    switch (access) {
      case 'allow':
        break
      case 'deny':
        this.error(403)
        return res
      case 'ignore':
      default:
        this.error(404)
        return res
    }
  }

  // index file support
  if (this._index.length && this.hasTrailingSlash()) {
    this.sendIndex(path)
    return res
  }

  this.sendFile(path)
  return res
}

/**
 * Transfer `path`.
 *
 * @param {String} path
 * @api public
 */

SendStream.prototype.send = function send (path, stat) {
  var len = stat.size
  var options = this.options
  var opts = {}
  var res = this.res
  var req = this.req
  var ranges = req.headers.range
  var offset = options.start || 0

  if (headersSent(res)) {
    // impossible to send now
    this.headersAlreadySent()
    return
  }

  debug('pipe "%s"', path)

  // set header fields
  this.setHeader(path, stat)

  // set content-type
  this.type(path)

  // conditional GET support
  if (this.isConditionalGET()) {
    if (this.isPreconditionFailure()) {
      this.error(412)
      return
    }

    if (this.isCachable() && this.isFresh()) {
      this.notModified()
      return
    }
  }

  // adjust len to start/end options
  len = Math.max(0, len - offset)
  if (options.end !== undefined) {
    var bytes = options.end - offset + 1
    if (len > bytes) len = bytes
  }

  // Range support
  if (this._acceptRanges && BYTES_RANGE_REGEXP.test(ranges)) {
    // parse
    ranges = parseRange(len, ranges, {
      combine: true
    })

    // If-Range support
    if (!this.isRangeFresh()) {
      debug('range stale')
      ranges = -2
    }

    // unsatisfiable
    if (ranges === -1) {
      debug('range unsatisfiable')

      // Content-Range
      res.setHeader('Content-Range', contentRange('bytes', len))

      // 416 Requested Range Not Satisfiable
      return this.error(416, {
        headers: { 'Content-Range': res.getHeader('Content-Range') }
      })
    }

    // valid (syntactically invalid/multiple ranges are treated as a regular response)
    if (ranges !== -2 && ranges.length === 1) {
      debug('range %j', ranges)

      // Content-Range
      res.statusCode = 206
      res.setHeader('Content-Range', contentRange('bytes', len, ranges[0]))

      // adjust for requested range
      offset += ranges[0].start
      len = ranges[0].end - ranges[0].start + 1
    }
  }

  // clone options
  for (var prop in options) {
    opts[prop] = options[prop]
  }

  // set read options
  opts.start = offset
  opts.end = Math.max(offset, offset + len - 1)

  // content-length
  res.setHeader('Content-Length', len)

  // HEAD support
  if (req.method === 'HEAD') {
    res.end()
    return
  }

  this.stream(path, opts)
}

/**
 * Transfer file for `path`.
 *
 * @param {String} path
 * @api private
 */
SendStream.prototype.sendFile = function sendFile (path) {
  var i = 0
  var self = this

  debug('stat "%s"', path)
  fs.stat(path, function onstat (err, stat) {
    if (err && err.code === 'ENOENT' && !extname(path) && path[path.length - 1] !== sep) {
      // not found, check extensions
      return next(err)
    }
    if (err) return self.onStatError(err)
    if (stat.isDirectory()) return self.redirect(path)
    self.emit('file', path, stat)
    self.send(path, stat)
  })

  function next (err) {
    if (self._extensions.length <= i) {
      return err
        ? self.onStatError(err)
        : self.error(404)
    }

    var p = path + '.' + self._extensions[i++]

    debug('stat "%s"', p)
    fs.stat(p, function (err, stat) {
      if (err) return next(err)
      if (stat.isDirectory()) return next()
      self.emit('file', p, stat)
      self.send(p, stat)
    })
  }
}

/**
 * Transfer index for `path`.
 *
 * @param {String} path
 * @api private
 */
SendStream.prototype.sendIndex = function sendIndex (path) {
  var i = -1
  var self = this

  function next (err) {
    if (++i >= self._index.length) {
      if (err) return self.onStatError(err)
      return self.error(404)
    }

    var p = join(path, self._index[i])

    debug('stat "%s"', p)
    fs.stat(p, function (err, stat) {
      if (err) return next(err)
      if (stat.isDirectory()) return next()
      self.emit('file', p, stat)
      self.send(p, stat)
    })
  }

  next()
}

/**
 * Stream `path` to the response.
 *
 * @param {String} path
 * @param {Object} options
 * @api private
 */

SendStream.prototype.stream = function stream (path, options) {
  var self = this
  var res = this.res

  // pipe
  var stream = fs.createReadStream(path, options)
  this.emit('stream', stream)
  stream.pipe(res)

  // cleanup
  function cleanup () {
    destroy(stream, true)
  }

  // response finished, cleanup
  onFinished(res, cleanup)

  // error handling
  stream.on('error', function onerror (err) {
    // clean up stream early
    cleanup()

    // error
    self.onStatError(err)
  })

  // end
  stream.on('end', function onend () {
    self.emit('end')
  })
}

/**
 * Set content-type based on `path`
 * if it hasn't been explicitly set.
 *
 * @param {String} path
 * @api private
 */

SendStream.prototype.type = function type (path) {
  var res = this.res

  if (res.getHeader('Content-Type')) return

  var type = mime.lookup(path)

  if (!type) {
    debug('no content-type')
    return
  }

  var charset = mime.charsets.lookup(type)

  debug('content-type %s', type)
  res.setHeader('Content-Type', type + (charset ? '; charset=' + charset : ''))
}

/**
 * Set response header fields, most
 * fields may be pre-defined.
 *
 * @param {String} path
 * @param {Object} stat
 * @api private
 */

SendStream.prototype.setHeader = function setHeader (path, stat) {
  var res = this.res

  this.emit('headers', res, path, stat)

  if (this._acceptRanges && !res.getHeader('Accept-Ranges')) {
    debug('accept ranges')
    res.setHeader('Accept-Ranges', 'bytes')
  }

  if (this._cacheControl && !res.getHeader('Cache-Control')) {
    var cacheControl = 'public, max-age=' + Math.floor(this._maxage / 1000)

    if (this._immutable) {
      cacheControl += ', immutable'
    }

    debug('cache-control %s', cacheControl)
    res.setHeader('Cache-Control', cacheControl)
  }

  if (this._lastModified && !res.getHeader('Last-Modified')) {
    var modified = stat.mtime.toUTCString()
    debug('modified %s', modified)
    res.setHeader('Last-Modified', modified)
  }

  if (this._etag && !res.getHeader('ETag')) {
    var val = etag(stat)
    debug('etag %s', val)
    res.setHeader('ETag', val)
  }
}

/**
 * Clear all headers from a response.
 *
 * @param {object} res
 * @private
 */

function clearHeaders (res) {
  var headers = getHeaderNames(res)

  for (var i = 0; i < headers.length; i++) {
    res.removeHeader(headers[i])
  }
}

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

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

/**
 * Determine if path parts contain a dotfile.
 *
 * @api private
 */

function containsDotFile (parts) {
  for (var i = 0; i < parts.length; i++) {
    var part = parts[i]
    if (part.length > 1 && part[0] === '.') {
      return true
    }
  }

  return false
}

/**
 * Create a Content-Range header.
 *
 * @param {string} type
 * @param {number} size
 * @param {array} [range]
 */

function contentRange (type, size, range) {
  return type + ' ' + (range ? range.start + '-' + range.end : '*') + '/' + size
}

/**
 * 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 HttpError object from simple arguments.
 *
 * @param {number} status
 * @param {Error|object} err
 * @private
 */

function createHttpError (status, err) {
  if (!err) {
    return createError(status)
  }

  return err instanceof Error
    ? createError(status, err, { expose: false })
    : createError(status, err)
}

/**
 * decodeURIComponent.
 *
 * Allows V8 to only deoptimize this fn instead of all
 * of send().
 *
 * @param {String} path
 * @api private
 */

function decode (path) {
  try {
    return decodeURIComponent(path)
  } catch (err) {
    return -1
  }
}

/**
 * Get the header names on a respnse.
 *
 * @param {object} res
 * @returns {array[string]}
 * @private
 */

function getHeaderNames (res) {
  return typeof res.getHeaderNames !== 'function'
    ? Object.keys(res._headers || {})
    : res.getHeaderNames()
}

/**
 * Determine if emitter has listeners of a given type.
 *
 * The way to do this check is done three different ways in Node.js >= 0.8
 * so this consolidates them into a minimal set using instance methods.
 *
 * @param {EventEmitter} emitter
 * @param {string} type
 * @returns {boolean}
 * @private
 */

function hasListeners (emitter, type) {
  var count = typeof emitter.listenerCount !== 'function'
    ? emitter.listeners(type).length
    : emitter.listenerCount(type)

  return count > 0
}

/**
 * Determine if the response headers have been sent.
 *
 * @param {object} res
 * @returns {boolean}
 * @private
 */

function headersSent (res) {
  return typeof res.headersSent !== 'boolean'
    ? Boolean(res._header)
    : res.headersSent
}

/**
 * Normalize the index option into an array.
 *
 * @param {boolean|string|array} val
 * @param {string} name
 * @private
 */

function normalizeList (val, name) {
  var list = [].concat(val || [])

  for (var i = 0; i < list.length; i++) {
    if (typeof list[i] !== 'string') {
      throw new TypeError(name + ' must be array of strings or false')
    }
  }

  return list
}

/**
 * Parse an HTTP Date into a number.
 *
 * @param {string} date
 * @private
 */

function parseHttpDate (date) {
  var timestamp = date && Date.parse(date)

  return typeof timestamp === 'number'
    ? timestamp
    : NaN
}

/**
 * Parse a HTTP token list.
 *
 * @param {string} str
 * @private
 */

function parseTokenList (str) {
  var end = 0
  var list = []
  var start = 0

  // gather tokens
  for (var i = 0, len = str.length; i < len; i++) {
    switch (str.charCodeAt(i)) {
      case 0x20: /*   */
        if (start === end) {
          start = end = i + 1
        }
        break
      case 0x2c: /* , */
        if (start !== end) {
          list.push(str.substring(start, end))
        }
        start = end = i + 1
        break
      default:
        end = i + 1
        break
    }
  }

  // final token
  if (start !== end) {
    list.push(str.substring(start, end))
  }

  return list
}

/**
 * Set an object of headers on a response.
 *
 * @param {object} res
 * @param {object} headers
 * @private
 */

function setHeaders (res, headers) {
  var keys = Object.keys(headers)

  for (var i = 0; i < keys.length; i++) {
    var key = keys[i]
    res.setHeader(key, headers[key])
  }
}
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