1 | /*!
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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 |
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9 | 'use strict'
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10 |
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11 | /**
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12 | * Module dependencies.
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13 | * @private
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14 | */
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15 |
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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 |
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23 | /**
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24 | * Module exports.
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25 | * @public
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26 | */
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27 |
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28 | module.exports = serveStatic
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29 | module.exports.mime = send.mime
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30 |
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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 |
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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 |
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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 |
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47 | // copy options object
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48 | var opts = Object.create(options || null)
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49 |
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50 | // fall-though
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51 | var fallthrough = opts.fallthrough !== false
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52 |
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53 | // default redirect
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54 | var redirect = opts.redirect !== false
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55 |
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56 | // headers listener
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57 | var setHeaders = opts.setHeaders
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58 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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95 | // create send stream
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96 | var stream = send(req, path, opts)
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97 |
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98 | // add directory handler
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99 | stream.on('directory', onDirectory)
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100 |
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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 |
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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 |
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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 |
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121 | next()
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122 | })
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123 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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189 | // get original URL
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190 | var originalUrl = parseUrl.original(this.req)
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191 |
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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 |
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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 |
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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 'none'")
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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 | }
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