root / HServer / 00.Server / 00.Program / node_modules / serve-static / index.js
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| 1 | 39 | HKM | /*!
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| 2 | * serve-static
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| 3 | * Copyright(c) 2010 Sencha Inc.
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| 4 | * Copyright(c) 2011 TJ Holowaychuk
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| 5 | * Copyright(c) 2014-2016 Douglas Christopher Wilson
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| 6 | * MIT Licensed
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| 7 | */
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| 8 | |||
| 9 | 'use strict'
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| 10 | |||
| 11 | /**
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| 12 | * Module dependencies.
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| 13 | * @private
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| 14 | */
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| 15 | |||
| 16 | var encodeUrl = require('encodeurl') |
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| 17 | var escapeHtml = require('escape-html') |
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| 18 | var parseUrl = require('parseurl') |
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| 19 | var resolve = require('path').resolve |
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| 20 | var send = require('send') |
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| 21 | var url = require('url') |
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| 22 | |||
| 23 | /**
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| 24 | * Module exports.
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| 25 | * @public
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| 26 | */
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| 27 | |||
| 28 | module.exports = serveStatic |
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| 29 | module.exports.mime = send.mime |
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| 30 | |||
| 31 | /**
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| 32 | * @param {string} root
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| 33 | * @param {object} [options]
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| 34 | * @return {function}
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| 35 | * @public
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| 36 | */
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| 37 | |||
| 38 | function serveStatic (root, options) { |
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| 39 | if (!root) {
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| 40 | throw new TypeError('root path required') |
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| 41 | } |
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| 42 | |||
| 43 | if (typeof root !== 'string') { |
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| 44 | throw new TypeError('root path must be a string') |
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| 45 | } |
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| 46 | |||
| 47 | // copy options object
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| 48 | var opts = Object.create(options || null) |
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| 49 | |||
| 50 | // fall-though
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| 51 | var fallthrough = opts.fallthrough !== false |
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| 52 | |||
| 53 | // default redirect
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| 54 | var redirect = opts.redirect !== false |
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| 55 | |||
| 56 | // headers listener
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| 57 | var setHeaders = opts.setHeaders
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| 58 | |||
| 59 | if (setHeaders && typeof setHeaders !== 'function') { |
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| 60 | throw new TypeError('option setHeaders must be function') |
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| 61 | } |
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| 62 | |||
| 63 | // setup options for send
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| 64 | opts.maxage = opts.maxage || opts.maxAge || 0
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| 65 | opts.root = resolve(root) |
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| 66 | |||
| 67 | // construct directory listener
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| 68 | var onDirectory = redirect
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| 69 | ? createRedirectDirectoryListener() |
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| 70 | : createNotFoundDirectoryListener() |
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| 71 | |||
| 72 | return function serveStatic (req, res, next) { |
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| 73 | if (req.method !== 'GET' && req.method !== 'HEAD') { |
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| 74 | if (fallthrough) {
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| 75 | return next()
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| 76 | } |
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| 77 | |||
| 78 | // method not allowed
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| 79 | res.statusCode = 405
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| 80 | res.setHeader('Allow', 'GET, HEAD') |
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| 81 | res.setHeader('Content-Length', '0') |
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| 82 | res.end() |
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| 83 | return
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| 84 | } |
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| 85 | |||
| 86 | var forwardError = !fallthrough
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| 87 | var originalUrl = parseUrl.original(req)
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| 88 | var path = parseUrl(req).pathname
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| 89 | |||
| 90 | // make sure redirect occurs at mount
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| 91 | if (path === '/' && originalUrl.pathname.substr(-1) !== '/') { |
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| 92 | path = ''
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| 93 | } |
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| 94 | |||
| 95 | // create send stream
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| 96 | var stream = send(req, path, opts)
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| 97 | |||
| 98 | // add directory handler
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| 99 | stream.on('directory', onDirectory)
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| 100 | |||
| 101 | // add headers listener
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| 102 | if (setHeaders) {
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| 103 | stream.on('headers', setHeaders)
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| 104 | } |
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| 105 | |||
| 106 | // add file listener for fallthrough
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| 107 | if (fallthrough) {
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| 108 | stream.on('file', function onFile () { |
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| 109 | // once file is determined, always forward error
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| 110 | forwardError = true
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| 111 | }) |
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| 112 | } |
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| 113 | |||
| 114 | // forward errors
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| 115 | stream.on('error', function error (err) { |
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| 116 | if (forwardError || !(err.statusCode < 500)) { |
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| 117 | next(err) |
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| 118 | return
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| 119 | } |
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| 120 | |||
| 121 | next() |
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| 122 | }) |
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| 123 | |||
| 124 | // pipe
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| 125 | stream.pipe(res) |
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| 126 | } |
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| 127 | } |
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| 128 | |||
| 129 | /**
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| 130 | * Collapse all leading slashes into a single slash
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| 131 | * @private
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| 132 | */
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| 133 | function collapseLeadingSlashes (str) { |
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| 134 | for (var i = 0; i < str.length; i++) { |
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| 135 | if (str.charCodeAt(i) !== 0x2f /* / */) { |
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| 136 | break
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| 137 | } |
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| 138 | } |
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| 139 | |||
| 140 | return i > 1 |
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| 141 | ? '/' + str.substr(i)
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| 142 | : str |
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| 143 | } |
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| 144 | |||
| 145 | /**
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| 146 | * Create a minimal HTML document.
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| 147 | *
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| 148 | * @param {string} title
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| 149 | * @param {string} body
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| 150 | * @private
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| 151 | */
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| 152 | |||
| 153 | function createHtmlDocument (title, body) { |
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| 154 | return '<!DOCTYPE html>\n' + |
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| 155 | '<html lang="en">\n' +
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| 156 | '<head>\n' +
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| 157 | '<meta charset="utf-8">\n' +
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| 158 | '<title>' + title + '</title>\n' + |
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| 159 | '</head>\n' +
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| 160 | '<body>\n' +
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| 161 | '<pre>' + body + '</pre>\n' + |
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| 162 | '</body>\n' +
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| 163 | '</html>\n'
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| 164 | } |
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| 165 | |||
| 166 | /**
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| 167 | * Create a directory listener that just 404s.
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| 168 | * @private
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| 169 | */
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| 170 | |||
| 171 | function createNotFoundDirectoryListener () { |
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| 172 | return function notFound () { |
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| 173 | this.error(404) |
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| 174 | } |
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| 175 | } |
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| 176 | |||
| 177 | /**
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| 178 | * Create a directory listener that performs a redirect.
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| 179 | * @private
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| 180 | */
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| 181 | |||
| 182 | function createRedirectDirectoryListener () { |
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| 183 | return function redirect (res) { |
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| 184 | if (this.hasTrailingSlash()) { |
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| 185 | this.error(404) |
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| 186 | return
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| 187 | } |
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| 188 | |||
| 189 | // get original URL
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| 190 | var originalUrl = parseUrl.original(this.req) |
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| 191 | |||
| 192 | // append trailing slash
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| 193 | originalUrl.path = null
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| 194 | originalUrl.pathname = collapseLeadingSlashes(originalUrl.pathname + '/')
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| 195 | |||
| 196 | // reformat the URL
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| 197 | var loc = encodeUrl(url.format(originalUrl))
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| 198 | var doc = createHtmlDocument('Redirecting', 'Redirecting to <a href="' + escapeHtml(loc) + '">' + |
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| 199 | escapeHtml(loc) + '</a>')
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| 200 | |||
| 201 | // send redirect response
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| 202 | res.statusCode = 301
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| 203 | res.setHeader('Content-Type', 'text/html; charset=UTF-8') |
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| 204 | res.setHeader('Content-Length', Buffer.byteLength(doc))
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| 205 | res.setHeader('Content-Security-Policy', "default-src 'self'") |
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| 206 | res.setHeader('X-Content-Type-Options', 'nosniff') |
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| 207 | res.setHeader('Location', loc)
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| 208 | res.end(doc) |
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| 209 | } |
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| 210 | } |