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