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(The MIT License)
Copyright (c) 2012 TJ Holowaychuk
Copyright (c) 2014-2022 Douglas Christopher Wilson
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
'Software'), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# send
[![NPM Version][npm-version-image]][npm-url]
[![NPM Downloads][npm-downloads-image]][npm-url]
[![CI][github-actions-ci-image]][github-actions-ci-url]
[![Test Coverage][coveralls-image]][coveralls-url]
Send is a library for streaming files from the file system as a http response
supporting partial responses (Ranges), conditional-GET negotiation (If-Match,
If-Unmodified-Since, If-None-Match, If-Modified-Since), high test coverage,
and granular events which may be leveraged to take appropriate actions in your
application or framework.
Looking to serve up entire folders mapped to URLs? Try [serve-static](https://www.npmjs.org/package/serve-static).
## Installation
This is a [Node.js](https://nodejs.org/en/) module available through the
[npm registry](https://www.npmjs.com/). Installation is done using the
[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
```bash
$ npm install send
```
## API
```js
var send = require('send')
```
### send(req, path, [options])
Create a new `SendStream` for the given path to send to a `res`. The `req` is
the Node.js HTTP request and the `path` is a urlencoded path to send (urlencoded,
not the actual file-system path).
#### Options
##### acceptRanges
Enable or disable accepting ranged requests, defaults to true.
Disabling this will not send `Accept-Ranges` and ignore the contents
of the `Range` request header.
##### cacheControl
Enable or disable setting `Cache-Control` response header, defaults to
true. Disabling this will ignore the `immutable` and `maxAge` options.
##### dotfiles
Set how "dotfiles" are treated when encountered. A dotfile is a file
or directory that begins with a dot ("."). Note this check is done on
the path itself without checking if the path actually exists on the
disk. If `root` is specified, only the dotfiles above the root are
checked (i.e. the root itself can be within a dotfile when set
to "deny").
- `'allow'` No special treatment for dotfiles.
- `'deny'` Send a 403 for any request for a dotfile.
- `'ignore'` Pretend like the dotfile does not exist and 404.
The default value is _similar_ to `'ignore'`, with the exception that
this default will not ignore the files within a directory that begins
with a dot, for backward-compatibility.
##### end
Byte offset at which the stream ends, defaults to the length of the file
minus 1. The end is inclusive in the stream, meaning `end: 3` will include
the 4th byte in the stream.
##### etag
Enable or disable etag generation, defaults to true.
##### extensions
If a given file doesn't exist, try appending one of the given extensions,
in the given order. By default, this is disabled (set to `false`). An
example value that will serve extension-less HTML files: `['html', 'htm']`.
This is skipped if the requested file already has an extension.
##### immutable
Enable or disable the `immutable` directive in the `Cache-Control` response
header, defaults to `false`. If set to `true`, the `maxAge` option should
also be specified to enable caching. The `immutable` directive will prevent
supported clients from making conditional requests during the life of the
`maxAge` option to check if the file has changed.
##### index
By default send supports "index.html" files, to disable this
set `false` or to supply a new index pass a string or an array
in preferred order.
##### lastModified
Enable or disable `Last-Modified` header, defaults to true. Uses the file
system's last modified value.
##### maxAge
Provide a max-age in milliseconds for http caching, defaults to 0.
This can also be a string accepted by the
[ms](https://www.npmjs.org/package/ms#readme) module.
##### root
Serve files relative to `path`.
##### start
Byte offset at which the stream starts, defaults to 0. The start is inclusive,
meaning `start: 2` will include the 3rd byte in the stream.
#### Events
The `SendStream` is an event emitter and will emit the following events:
- `error` an error occurred `(err)`
- `directory` a directory was requested `(res, path)`
- `file` a file was requested `(path, stat)`
- `headers` the headers are about to be set on a file `(res, path, stat)`
- `stream` file streaming has started `(stream)`
- `end` streaming has completed
#### .pipe
The `pipe` method is used to pipe the response into the Node.js HTTP response
object, typically `send(req, path, options).pipe(res)`.
## Error-handling
By default when no `error` listeners are present an automatic response will be
made, otherwise you have full control over the response, aka you may show a 5xx
page etc.
## Caching
It does _not_ perform internal caching, you should use a reverse proxy cache
such as Varnish for this, or those fancy things called CDNs. If your
application is small enough that it would benefit from single-node memory
caching, it's small enough that it does not need caching at all ;).
## Debugging
To enable `debug()` instrumentation output export __DEBUG__:
```
$ DEBUG=send node app
```
## Running tests
```
$ npm install
$ npm test
```
## Examples
### Serve a specific file
This simple example will send a specific file to all requests.
```js
var http = require('http')
var send = require('send')
var server = http.createServer(function onRequest (req, res) {
send(req, '/path/to/index.html')
.pipe(res)
})
server.listen(3000)
```
### Serve all files from a directory
This simple example will just serve up all the files in a
given directory as the top-level. For example, a request
`GET /foo.txt` will send back `/www/public/foo.txt`.
```js
var http = require('http')
var parseUrl = require('parseurl')
var send = require('send')
var server = http.createServer(function onRequest (req, res) {
send(req, parseUrl(req).pathname, { root: '/www/public' })
.pipe(res)
})
server.listen(3000)
```
### Custom file types
```js
var extname = require('path').extname
var http = require('http')
var parseUrl = require('parseurl')
var send = require('send')
var server = http.createServer(function onRequest (req, res) {
send(req, parseUrl(req).pathname, { root: '/www/public' })
.on('headers', function (res, path) {
switch (extname(path)) {
case '.x-mt':
case '.x-mtt':
// custom type for these extensions
res.setHeader('Content-Type', 'application/x-my-type')
break
}
})
.pipe(res)
})
server.listen(3000)
```
### Custom directory index view
This is an example of serving up a structure of directories with a
custom function to render a listing of a directory.
```js
var http = require('http')
var fs = require('fs')
var parseUrl = require('parseurl')
var send = require('send')
// Transfer arbitrary files from within /www/example.com/public/*
// with a custom handler for directory listing
var server = http.createServer(function onRequest (req, res) {
send(req, parseUrl(req).pathname, { index: false, root: '/www/public' })
.once('directory', directory)
.pipe(res)
})
server.listen(3000)
// Custom directory handler
function directory (res, path) {
var stream = this
// redirect to trailing slash for consistent url
if (!stream.hasTrailingSlash()) {
return stream.redirect(path)
}
// get directory list
fs.readdir(path, function onReaddir (err, list) {
if (err) return stream.error(err)
// render an index for the directory
res.setHeader('Content-Type', 'text/plain; charset=UTF-8')
res.end(list.join('\n') + '\n')
})
}
```
### Serving from a root directory with custom error-handling
```js
var http = require('http')
var parseUrl = require('parseurl')
var send = require('send')
var server = http.createServer(function onRequest (req, res) {
// your custom error-handling logic:
function error (err) {
res.statusCode = err.status || 500
res.end(err.message)
}
// your custom headers
function headers (res, path, stat) {
// serve all files for download
res.setHeader('Content-Disposition', 'attachment')
}
// your custom directory handling logic:
function redirect () {
res.statusCode = 301
res.setHeader('Location', req.url + '/')
res.end('Redirecting to ' + req.url + '/')
}
// transfer arbitrary files from within
// /www/example.com/public/*
send(req, parseUrl(req).pathname, { root: '/www/public' })
.on('error', error)
.on('directory', redirect)
.on('headers', headers)
.pipe(res)
})
server.listen(3000)
```
## License
[MIT](LICENSE)
[coveralls-image]: https://badgen.net/coveralls/c/github/pillarjs/send/master
[coveralls-url]: https://coveralls.io/r/pillarjs/send?branch=master
[github-actions-ci-image]: https://badgen.net/github/checks/pillarjs/send/master?label=linux
[github-actions-ci-url]: https://github.com/pillarjs/send/actions/workflows/ci.yml
[node-image]: https://badgen.net/npm/node/send
[node-url]: https://nodejs.org/en/download/
[npm-downloads-image]: https://badgen.net/npm/dm/send
[npm-url]: https://npmjs.org/package/send
[npm-version-image]: https://badgen.net/npm/v/send

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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 encodeUrl = require('encodeurl')
var escapeHtml = require('escape-html')
var etag = require('etag')
var fresh = require('fresh')
var fs = require('fs')
var mime = require('mime-types')
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
/**
* 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._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
}
/**
* Inherits from `Stream`.
*/
util.inherits(SendStream, Stream)
/**
* 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)) {
debug('%s dotfile "%s"', this._dotfiles, path)
switch (this._dotfiles) {
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 (res.headersSent) {
// 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) {
var pathEndsWithSep = path[path.length - 1] === sep
if (err && err.code === 'ENOENT' && !extname(path) && !pathEndsWithSep) {
// not found, check extensions
return next(err)
}
if (err) return self.onStatError(err)
if (stat.isDirectory()) return self.redirect(path)
if (pathEndsWithSep) return self.error(404)
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 () {
stream.destroy()
}
// 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 ext = extname(path)
var type = mime.contentType(ext) || 'application/octet-stream'
debug('content-type %s', type)
res.setHeader('Content-Type', type)
}
/**
* 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) {
for (const header of res.getHeaderNames()) {
res.removeHeader(header)
}
}
/**
* 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
}
}
/**
* Determine if emitter has listeners of a given type.
*
* The way to do this check is done three different ways in Node.js >= 0.10
* 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
}
/**
* 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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2.0.0 - 2024-09-04
==========
* Drop support for Node.js <18
1.0.0 - 2024-09-04
==========
* Drop support for Node.js below 0.8
* Fix: Ignore `If-Modified-Since` in the presence of `If-None-Match`, according to [spec](https://www.rfc-editor.org/rfc/rfc9110.html#section-13.1.3-5). Fixes [#35](https://github.com/jshttp/fresh/issues/35)
0.5.2 / 2017-09-13
==================
* Fix regression matching multiple ETags in `If-None-Match`
* perf: improve `If-None-Match` token parsing
0.5.1 / 2017-09-11
==================
* Fix handling of modified headers with invalid dates
* perf: improve ETag match loop
0.5.0 / 2017-02-21
==================
* Fix incorrect result when `If-None-Match` has both `*` and ETags
* Fix weak `ETag` matching to match spec
* perf: delay reading header values until needed
* perf: skip checking modified time if ETag check failed
* perf: skip parsing `If-None-Match` when no `ETag` header
* perf: use `Date.parse` instead of `new Date`
0.4.0 / 2017-02-05
==================
* Fix false detection of `no-cache` request directive
* perf: enable strict mode
* perf: hoist regular expressions
* perf: remove duplicate conditional
* perf: remove unnecessary boolean coercions
0.3.0 / 2015-05-12
==================
* Add weak `ETag` matching support
0.2.4 / 2014-09-07
==================
* Support Node.js 0.6
0.2.3 / 2014-09-07
==================
* Move repository to jshttp
0.2.2 / 2014-02-19
==================
* Revert "Fix for blank page on Safari reload"
0.2.1 / 2014-01-29
==================
* Fix for blank page on Safari reload
0.2.0 / 2013-08-11
==================
* Return stale for `Cache-Control: no-cache`
0.1.0 / 2012-06-15
==================
* Add `If-None-Match: *` support
0.0.1 / 2012-06-10
==================
* Initial release

23
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(The MIT License)
Copyright (c) 2012 TJ Holowaychuk <tj@vision-media.ca>
Copyright (c) 2016-2017 Douglas Christopher Wilson <doug@somethingdoug.com>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
'Software'), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# fresh
[![NPM Version][npm-image]][npm-url]
[![NPM Downloads][downloads-image]][downloads-url]
[![Node.js Version][node-version-image]][node-version-url]
[![Build Status][ci-image]][ci-url]
[![Test Coverage][coveralls-image]][coveralls-url]
HTTP response freshness testing
## Installation
This is a [Node.js](https://nodejs.org/en/) module available through the
[npm registry](https://www.npmjs.com/). Installation is done using the
[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
```
$ npm install fresh
```
## API
```js
var fresh = require('fresh')
```
### fresh(reqHeaders, resHeaders)
Check freshness of the response using request and response headers.
When the response is still "fresh" in the client's cache `true` is
returned, otherwise `false` is returned to indicate that the client
cache is now stale and the full response should be sent.
When a client sends the `Cache-Control: no-cache` request header to
indicate an end-to-end reload request, this module will return `false`
to make handling these requests transparent.
## Known Issues
This module is designed to only follow the HTTP specifications, not
to work-around all kinda of client bugs (especially since this module
typically does not receive enough information to understand what the
client actually is).
There is a known issue that in certain versions of Safari, Safari
will incorrectly make a request that allows this module to validate
freshness of the resource even when Safari does not have a
representation of the resource in the cache. The module
[jumanji](https://www.npmjs.com/package/jumanji) can be used in
an Express application to work-around this issue and also provides
links to further reading on this Safari bug.
## Example
### API usage
<!-- eslint-disable no-redeclare -->
```js
var reqHeaders = { 'if-none-match': '"foo"' }
var resHeaders = { etag: '"bar"' }
fresh(reqHeaders, resHeaders)
// => false
var reqHeaders = { 'if-none-match': '"foo"' }
var resHeaders = { etag: '"foo"' }
fresh(reqHeaders, resHeaders)
// => true
```
### Using with Node.js http server
```js
var fresh = require('fresh')
var http = require('http')
var server = http.createServer(function (req, res) {
// perform server logic
// ... including adding ETag / Last-Modified response headers
if (isFresh(req, res)) {
// client has a fresh copy of resource
res.statusCode = 304
res.end()
return
}
// send the resource
res.statusCode = 200
res.end('hello, world!')
})
function isFresh (req, res) {
return fresh(req.headers, {
etag: res.getHeader('ETag'),
'last-modified': res.getHeader('Last-Modified')
})
}
server.listen(3000)
```
## License
[MIT](LICENSE)
[ci-image]: https://img.shields.io/github/workflow/status/jshttp/fresh/ci/master?label=ci
[ci-url]: https://github.com/jshttp/fresh/actions/workflows/ci.yml
[npm-image]: https://img.shields.io/npm/v/fresh.svg
[npm-url]: https://npmjs.org/package/fresh
[node-version-image]: https://img.shields.io/node/v/fresh.svg
[node-version-url]: https://nodejs.org/en/
[coveralls-image]: https://img.shields.io/coveralls/jshttp/fresh/master.svg
[coveralls-url]: https://coveralls.io/r/jshttp/fresh?branch=master
[downloads-image]: https://img.shields.io/npm/dm/fresh.svg
[downloads-url]: https://npmjs.org/package/fresh

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/*!
* fresh
* Copyright(c) 2012 TJ Holowaychuk
* Copyright(c) 2016-2017 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict'
/**
* RegExp to check for no-cache token in Cache-Control.
* @private
*/
var CACHE_CONTROL_NO_CACHE_REGEXP = /(?:^|,)\s*?no-cache\s*?(?:,|$)/
/**
* Module exports.
* @public
*/
module.exports = fresh
/**
* Check freshness of the response using request and response headers.
*
* @param {Object} reqHeaders
* @param {Object} resHeaders
* @return {Boolean}
* @public
*/
function fresh (reqHeaders, resHeaders) {
// fields
var modifiedSince = reqHeaders['if-modified-since']
var noneMatch = reqHeaders['if-none-match']
// unconditional request
if (!modifiedSince && !noneMatch) {
return false
}
// Always return stale when Cache-Control: no-cache
// to support end-to-end reload requests
// https://tools.ietf.org/html/rfc2616#section-14.9.4
var cacheControl = reqHeaders['cache-control']
if (cacheControl && CACHE_CONTROL_NO_CACHE_REGEXP.test(cacheControl)) {
return false
}
// if-none-match takes precedent over if-modified-since
if (noneMatch) {
if (noneMatch === '*') {
return true
}
var etag = resHeaders.etag
if (!etag) {
return false
}
var matches = parseTokenList(noneMatch)
for (var i = 0; i < matches.length; i++) {
var match = matches[i]
if (match === etag || match === 'W/' + etag || 'W/' + match === etag) {
return true
}
}
return false
}
// if-modified-since
if (modifiedSince) {
var lastModified = resHeaders['last-modified']
var modifiedStale = !lastModified || !(parseHttpDate(lastModified) <= parseHttpDate(modifiedSince))
if (modifiedStale) {
return false
}
}
return true
}
/**
* Parse an HTTP Date into a number.
*
* @param {string} date
* @private
*/
function parseHttpDate (date) {
var timestamp = date && Date.parse(date)
// istanbul ignore next: guard against date.js Date.parse patching
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: /* , */
list.push(str.substring(start, end))
start = end = i + 1
break
default:
end = i + 1
break
}
}
// final token
list.push(str.substring(start, end))
return list
}

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{
"name": "fresh",
"description": "HTTP response freshness testing",
"version": "2.0.0",
"author": "TJ Holowaychuk <tj@vision-media.ca> (http://tjholowaychuk.com)",
"contributors": [
"Douglas Christopher Wilson <doug@somethingdoug.com>",
"Jonathan Ong <me@jongleberry.com> (http://jongleberry.com)"
],
"license": "MIT",
"keywords": [
"fresh",
"http",
"conditional",
"cache"
],
"repository": "jshttp/fresh",
"devDependencies": {
"beautify-benchmark": "0.2.4",
"benchmark": "2.1.4",
"eslint": "8.12.0",
"eslint-config-standard": "14.1.1",
"eslint-plugin-import": "2.25.4",
"eslint-plugin-markdown": "2.2.1",
"eslint-plugin-node": "11.1.0",
"eslint-plugin-promise": "6.0.0",
"eslint-plugin-standard": "4.1.0",
"mocha": "9.2.0",
"nyc": "15.1.0"
},
"files": [
"HISTORY.md",
"LICENSE",
"index.js"
],
"engines": {
"node": ">= 0.8"
},
"scripts": {
"bench": "node benchmark/index.js",
"lint": "eslint .",
"test": "mocha --reporter spec --check-leaks --bail test/",
"test-ci": "nyc --reporter=lcov --reporter=text npm test",
"test-cov": "nyc --reporter=html --reporter=text npm test"
}
}

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{
"name": "send",
"description": "Better streaming static file server with Range and conditional-GET support",
"version": "1.2.1",
"author": "TJ Holowaychuk <tj@vision-media.ca>",
"contributors": [
"Douglas Christopher Wilson <doug@somethingdoug.com>",
"James Wyatt Cready <jcready@gmail.com>",
"Jesús Leganés Combarro <piranna@gmail.com>"
],
"license": "MIT",
"repository": "pillarjs/send",
"funding": {
"type": "opencollective",
"url": "https://opencollective.com/express"
},
"keywords": [
"static",
"file",
"server"
],
"dependencies": {
"debug": "^4.4.3",
"encodeurl": "^2.0.0",
"escape-html": "^1.0.3",
"etag": "^1.8.1",
"fresh": "^2.0.0",
"http-errors": "^2.0.1",
"mime-types": "^3.0.2",
"ms": "^2.1.3",
"on-finished": "^2.4.1",
"range-parser": "^1.2.1",
"statuses": "^2.0.2"
},
"devDependencies": {
"after": "^0.8.2",
"eslint": "7.32.0",
"eslint-config-standard": "14.1.1",
"eslint-plugin-import": "2.32.0",
"eslint-plugin-markdown": "2.2.1",
"eslint-plugin-node": "11.1.0",
"eslint-plugin-promise": "5.2.0",
"eslint-plugin-standard": "4.1.0",
"mocha": "^10.7.0",
"nyc": "^17.0.0",
"supertest": "6.3.4"
},
"files": [
"LICENSE",
"README.md",
"index.js"
],
"engines": {
"node": ">= 18"
},
"scripts": {
"lint": "eslint .",
"test": "mocha --check-leaks --reporter spec",
"test-ci": "nyc --reporter=lcovonly --reporter=text npm test",
"test-cov": "nyc --reporter=html --reporter=text npm test",
"version": "node scripts/version-history.js && git add HISTORY.md"
}
}