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210 lines
4.5 KiB
210 lines
4.5 KiB
/*! |
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* serve-static |
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* Copyright(c) 2010 Sencha Inc. |
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* Copyright(c) 2011 TJ Holowaychuk |
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* Copyright(c) 2014-2016 Douglas Christopher Wilson |
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* MIT Licensed |
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*/ |
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'use strict' |
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/** |
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* Module dependencies. |
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* @private |
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*/ |
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var encodeUrl = require('encodeurl') |
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var escapeHtml = require('escape-html') |
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var parseUrl = require('parseurl') |
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var resolve = require('path').resolve |
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var send = require('send') |
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var url = require('url') |
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/** |
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* Module exports. |
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* @public |
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*/ |
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module.exports = serveStatic |
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module.exports.mime = send.mime |
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/** |
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* @param {string} root |
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* @param {object} [options] |
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* @return {function} |
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* @public |
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*/ |
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function serveStatic (root, options) { |
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if (!root) { |
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throw new TypeError('root path required') |
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} |
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if (typeof root !== 'string') { |
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throw new TypeError('root path must be a string') |
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} |
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// copy options object |
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var opts = Object.create(options || null) |
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// fall-though |
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var fallthrough = opts.fallthrough !== false |
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// default redirect |
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var redirect = opts.redirect !== false |
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// headers listener |
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var setHeaders = opts.setHeaders |
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if (setHeaders && typeof setHeaders !== 'function') { |
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throw new TypeError('option setHeaders must be function') |
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} |
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// setup options for send |
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opts.maxage = opts.maxage || opts.maxAge || 0 |
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opts.root = resolve(root) |
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// construct directory listener |
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var onDirectory = redirect |
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? createRedirectDirectoryListener() |
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: createNotFoundDirectoryListener() |
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return function serveStatic (req, res, next) { |
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if (req.method !== 'GET' && req.method !== 'HEAD') { |
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if (fallthrough) { |
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return next() |
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} |
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// method not allowed |
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res.statusCode = 405 |
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res.setHeader('Allow', 'GET, HEAD') |
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res.setHeader('Content-Length', '0') |
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res.end() |
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return |
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} |
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var forwardError = !fallthrough |
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var originalUrl = parseUrl.original(req) |
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var path = parseUrl(req).pathname |
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// make sure redirect occurs at mount |
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if (path === '/' && originalUrl.pathname.substr(-1) !== '/') { |
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path = '' |
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} |
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// create send stream |
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var stream = send(req, path, opts) |
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// add directory handler |
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stream.on('directory', onDirectory) |
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// add headers listener |
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if (setHeaders) { |
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stream.on('headers', setHeaders) |
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} |
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// add file listener for fallthrough |
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if (fallthrough) { |
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stream.on('file', function onFile () { |
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// once file is determined, always forward error |
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forwardError = true |
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}) |
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} |
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// forward errors |
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stream.on('error', function error (err) { |
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if (forwardError || !(err.statusCode < 500)) { |
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next(err) |
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return |
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} |
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next() |
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}) |
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// pipe |
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stream.pipe(res) |
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} |
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} |
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/** |
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* Collapse all leading slashes into a single slash |
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* @private |
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*/ |
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function collapseLeadingSlashes (str) { |
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for (var i = 0; i < str.length; i++) { |
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if (str.charCodeAt(i) !== 0x2f /* / */) { |
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break |
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} |
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} |
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return i > 1 |
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? '/' + str.substr(i) |
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: str |
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} |
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/** |
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* Create a minimal HTML document. |
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* |
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* @param {string} title |
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* @param {string} body |
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* @private |
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*/ |
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function createHtmlDocument (title, body) { |
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return '<!DOCTYPE html>\n' + |
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'<html lang="en">\n' + |
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'<head>\n' + |
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'<meta charset="utf-8">\n' + |
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'<title>' + title + '</title>\n' + |
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'</head>\n' + |
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'<body>\n' + |
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'<pre>' + body + '</pre>\n' + |
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'</body>\n' + |
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'</html>\n' |
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} |
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/** |
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* Create a directory listener that just 404s. |
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* @private |
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*/ |
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function createNotFoundDirectoryListener () { |
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return function notFound () { |
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this.error(404) |
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} |
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} |
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/** |
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* Create a directory listener that performs a redirect. |
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* @private |
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*/ |
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function createRedirectDirectoryListener () { |
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return function redirect (res) { |
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if (this.hasTrailingSlash()) { |
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this.error(404) |
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return |
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} |
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// get original URL |
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var originalUrl = parseUrl.original(this.req) |
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// append trailing slash |
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originalUrl.path = null |
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originalUrl.pathname = collapseLeadingSlashes(originalUrl.pathname + '/') |
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// reformat the URL |
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var loc = encodeUrl(url.format(originalUrl)) |
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var doc = createHtmlDocument('Redirecting', 'Redirecting to <a href="' + escapeHtml(loc) + '">' + |
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escapeHtml(loc) + '</a>') |
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// send redirect response |
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res.statusCode = 301 |
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res.setHeader('Content-Type', 'text/html; charset=UTF-8') |
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res.setHeader('Content-Length', Buffer.byteLength(doc)) |
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res.setHeader('Content-Security-Policy', "default-src 'self'") |
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res.setHeader('X-Content-Type-Options', 'nosniff') |
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res.setHeader('Location', loc) |
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res.end(doc) |
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} |
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}
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