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index.js
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Created: Wed, Feb 19, 19:46

index.js
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	/*!
	* serve-static
	* Copyright(c) 2010 Sencha Inc.
	* Copyright(c) 2011 TJ Holowaychuk
	* Copyright(c) 2014 Douglas Christopher Wilson
	* MIT Licensed
	*/

	/**
	* Module dependencies.
	*/

	var escapeHtml = require('escape-html');
	var merge = require('utils-merge');
	var parseurl = require('parseurl');
	var resolve = require('path').resolve;
	var send = require('send');
	var url = require('url');

	/**
	* @param {String} root
	* @param {Object} options
	* @return {Function}
	* @api public
	*/

	exports = module.exports = function serveStatic(root, options) {
	if (!root) {
	throw new TypeError('root path required')
	}

	// copy options object
	options = merge({}, options)

	// resolve root to absolute
	root = resolve(root)

	// default redirect
	var redirect = options.redirect !== false

	// headers listener
	var setHeaders = options.setHeaders
	delete options.setHeaders

	if (setHeaders && typeof setHeaders !== 'function') {
	throw new TypeError('option setHeaders must be function')
	}

	// setup options for send
	options.maxage = options.maxage \|\| options.maxAge \|\| 0
	options.root = root

	return function serveStatic(req, res, next) {
	if (req.method !== 'GET' && req.method !== 'HEAD') {
	return next()
	}

	var opts = merge({}, options)
	var originalUrl = parseurl.original(req)
	var path = parseurl(req).pathname

	if (path === '/' && originalUrl.pathname[originalUrl.pathname.length - 1] !== '/') {
	// make sure redirect occurs at mount
	path = ''
	}

	// create send stream
	var stream = send(req, path, opts)

	if (redirect) {
	// redirect relative to originalUrl
	stream.on('directory', function redirect() {
	originalUrl.pathname += '/'

	var target = url.format(originalUrl)

	res.statusCode = 303
	res.setHeader('Content-Type', 'text/html; charset=utf-8')
	res.setHeader('Location', target)
	res.end('Redirecting to <a href="' + escapeHtml(target) + '">' + escapeHtml(target) + '</a>\n')
	})
	} else {
	// forward to next middleware on directory
	stream.on('directory', next)
	}

	// add headers listener
	if (setHeaders) {
	stream.on('headers', setHeaders)
	}

	// forward non-404 errors
	stream.on('error', function error(err) {
	next(err.status === 404 ? null : err)
	})

	// pipe
	stream.pipe(res)
	}
	}

	/**
	* Expose mime module.
	*
	* If you wish to extend the mime table use this
	* reference to the "mime" module in the npm registry.
	*/

	exports.mime = send.mime

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