[6a3a178] | 1 | /*!
|
---|
| 2 | * serve-static
|
---|
| 3 | * Copyright(c) 2010 Sencha Inc.
|
---|
| 4 | * Copyright(c) 2011 TJ Holowaychuk
|
---|
| 5 | * Copyright(c) 2014-2016 Douglas Christopher Wilson
|
---|
| 6 | * MIT Licensed
|
---|
| 7 | */
|
---|
| 8 |
|
---|
| 9 | 'use strict'
|
---|
| 10 |
|
---|
| 11 | /**
|
---|
| 12 | * Module dependencies.
|
---|
| 13 | * @private
|
---|
| 14 | */
|
---|
| 15 |
|
---|
| 16 | var encodeUrl = require('encodeurl')
|
---|
| 17 | var escapeHtml = require('escape-html')
|
---|
| 18 | var parseUrl = require('parseurl')
|
---|
| 19 | var resolve = require('path').resolve
|
---|
| 20 | var send = require('send')
|
---|
| 21 | var url = require('url')
|
---|
| 22 |
|
---|
| 23 | /**
|
---|
| 24 | * Module exports.
|
---|
| 25 | * @public
|
---|
| 26 | */
|
---|
| 27 |
|
---|
| 28 | module.exports = serveStatic
|
---|
| 29 | module.exports.mime = send.mime
|
---|
| 30 |
|
---|
| 31 | /**
|
---|
| 32 | * @param {string} root
|
---|
| 33 | * @param {object} [options]
|
---|
| 34 | * @return {function}
|
---|
| 35 | * @public
|
---|
| 36 | */
|
---|
| 37 |
|
---|
| 38 | function serveStatic (root, options) {
|
---|
| 39 | if (!root) {
|
---|
| 40 | throw new TypeError('root path required')
|
---|
| 41 | }
|
---|
| 42 |
|
---|
| 43 | if (typeof root !== 'string') {
|
---|
| 44 | throw new TypeError('root path must be a string')
|
---|
| 45 | }
|
---|
| 46 |
|
---|
| 47 | // copy options object
|
---|
| 48 | var opts = Object.create(options || null)
|
---|
| 49 |
|
---|
| 50 | // fall-though
|
---|
| 51 | var fallthrough = opts.fallthrough !== false
|
---|
| 52 |
|
---|
| 53 | // default redirect
|
---|
| 54 | var redirect = opts.redirect !== false
|
---|
| 55 |
|
---|
| 56 | // headers listener
|
---|
| 57 | var setHeaders = opts.setHeaders
|
---|
| 58 |
|
---|
| 59 | if (setHeaders && typeof setHeaders !== 'function') {
|
---|
| 60 | throw new TypeError('option setHeaders must be function')
|
---|
| 61 | }
|
---|
| 62 |
|
---|
| 63 | // setup options for send
|
---|
| 64 | opts.maxage = opts.maxage || opts.maxAge || 0
|
---|
| 65 | opts.root = resolve(root)
|
---|
| 66 |
|
---|
| 67 | // construct directory listener
|
---|
| 68 | var onDirectory = redirect
|
---|
| 69 | ? createRedirectDirectoryListener()
|
---|
| 70 | : createNotFoundDirectoryListener()
|
---|
| 71 |
|
---|
| 72 | return function serveStatic (req, res, next) {
|
---|
| 73 | if (req.method !== 'GET' && req.method !== 'HEAD') {
|
---|
| 74 | if (fallthrough) {
|
---|
| 75 | return next()
|
---|
| 76 | }
|
---|
| 77 |
|
---|
| 78 | // method not allowed
|
---|
| 79 | res.statusCode = 405
|
---|
| 80 | res.setHeader('Allow', 'GET, HEAD')
|
---|
| 81 | res.setHeader('Content-Length', '0')
|
---|
| 82 | res.end()
|
---|
| 83 | return
|
---|
| 84 | }
|
---|
| 85 |
|
---|
| 86 | var forwardError = !fallthrough
|
---|
| 87 | var originalUrl = parseUrl.original(req)
|
---|
| 88 | var path = parseUrl(req).pathname
|
---|
| 89 |
|
---|
| 90 | // make sure redirect occurs at mount
|
---|
| 91 | if (path === '/' && originalUrl.pathname.substr(-1) !== '/') {
|
---|
| 92 | path = ''
|
---|
| 93 | }
|
---|
| 94 |
|
---|
| 95 | // create send stream
|
---|
| 96 | var stream = send(req, path, opts)
|
---|
| 97 |
|
---|
| 98 | // add directory handler
|
---|
| 99 | stream.on('directory', onDirectory)
|
---|
| 100 |
|
---|
| 101 | // add headers listener
|
---|
| 102 | if (setHeaders) {
|
---|
| 103 | stream.on('headers', setHeaders)
|
---|
| 104 | }
|
---|
| 105 |
|
---|
| 106 | // add file listener for fallthrough
|
---|
| 107 | if (fallthrough) {
|
---|
| 108 | stream.on('file', function onFile () {
|
---|
| 109 | // once file is determined, always forward error
|
---|
| 110 | forwardError = true
|
---|
| 111 | })
|
---|
| 112 | }
|
---|
| 113 |
|
---|
| 114 | // forward errors
|
---|
| 115 | stream.on('error', function error (err) {
|
---|
| 116 | if (forwardError || !(err.statusCode < 500)) {
|
---|
| 117 | next(err)
|
---|
| 118 | return
|
---|
| 119 | }
|
---|
| 120 |
|
---|
| 121 | next()
|
---|
| 122 | })
|
---|
| 123 |
|
---|
| 124 | // pipe
|
---|
| 125 | stream.pipe(res)
|
---|
| 126 | }
|
---|
| 127 | }
|
---|
| 128 |
|
---|
| 129 | /**
|
---|
| 130 | * Collapse all leading slashes into a single slash
|
---|
| 131 | * @private
|
---|
| 132 | */
|
---|
| 133 | function collapseLeadingSlashes (str) {
|
---|
| 134 | for (var i = 0; i < str.length; i++) {
|
---|
| 135 | if (str.charCodeAt(i) !== 0x2f /* / */) {
|
---|
| 136 | break
|
---|
| 137 | }
|
---|
| 138 | }
|
---|
| 139 |
|
---|
| 140 | return i > 1
|
---|
| 141 | ? '/' + str.substr(i)
|
---|
| 142 | : str
|
---|
| 143 | }
|
---|
| 144 |
|
---|
| 145 | /**
|
---|
| 146 | * Create a minimal HTML document.
|
---|
| 147 | *
|
---|
| 148 | * @param {string} title
|
---|
| 149 | * @param {string} body
|
---|
| 150 | * @private
|
---|
| 151 | */
|
---|
| 152 |
|
---|
| 153 | function createHtmlDocument (title, body) {
|
---|
| 154 | return '<!DOCTYPE html>\n' +
|
---|
| 155 | '<html lang="en">\n' +
|
---|
| 156 | '<head>\n' +
|
---|
| 157 | '<meta charset="utf-8">\n' +
|
---|
| 158 | '<title>' + title + '</title>\n' +
|
---|
| 159 | '</head>\n' +
|
---|
| 160 | '<body>\n' +
|
---|
| 161 | '<pre>' + body + '</pre>\n' +
|
---|
| 162 | '</body>\n' +
|
---|
| 163 | '</html>\n'
|
---|
| 164 | }
|
---|
| 165 |
|
---|
| 166 | /**
|
---|
| 167 | * Create a directory listener that just 404s.
|
---|
| 168 | * @private
|
---|
| 169 | */
|
---|
| 170 |
|
---|
| 171 | function createNotFoundDirectoryListener () {
|
---|
| 172 | return function notFound () {
|
---|
| 173 | this.error(404)
|
---|
| 174 | }
|
---|
| 175 | }
|
---|
| 176 |
|
---|
| 177 | /**
|
---|
| 178 | * Create a directory listener that performs a redirect.
|
---|
| 179 | * @private
|
---|
| 180 | */
|
---|
| 181 |
|
---|
| 182 | function createRedirectDirectoryListener () {
|
---|
| 183 | return function redirect (res) {
|
---|
| 184 | if (this.hasTrailingSlash()) {
|
---|
| 185 | this.error(404)
|
---|
| 186 | return
|
---|
| 187 | }
|
---|
| 188 |
|
---|
| 189 | // get original URL
|
---|
| 190 | var originalUrl = parseUrl.original(this.req)
|
---|
| 191 |
|
---|
| 192 | // append trailing slash
|
---|
| 193 | originalUrl.path = null
|
---|
| 194 | originalUrl.pathname = collapseLeadingSlashes(originalUrl.pathname + '/')
|
---|
| 195 |
|
---|
| 196 | // reformat the URL
|
---|
| 197 | var loc = encodeUrl(url.format(originalUrl))
|
---|
| 198 | var doc = createHtmlDocument('Redirecting', 'Redirecting to <a href="' + escapeHtml(loc) + '">' +
|
---|
| 199 | escapeHtml(loc) + '</a>')
|
---|
| 200 |
|
---|
| 201 | // send redirect response
|
---|
| 202 | res.statusCode = 301
|
---|
| 203 | res.setHeader('Content-Type', 'text/html; charset=UTF-8')
|
---|
| 204 | res.setHeader('Content-Length', Buffer.byteLength(doc))
|
---|
| 205 | res.setHeader('Content-Security-Policy', "default-src 'none'")
|
---|
| 206 | res.setHeader('X-Content-Type-Options', 'nosniff')
|
---|
| 207 | res.setHeader('Location', loc)
|
---|
| 208 | res.end(doc)
|
---|
| 209 | }
|
---|
| 210 | }
|
---|