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821 lines
17 KiB
JavaScript
821 lines
17 KiB
JavaScript
/*!
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* send
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* Copyright(c) 2012 TJ Holowaychuk
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* Copyright(c) 2014-2015 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 createError = require('http-errors')
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var debug = require('debug')('send')
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var deprecate = require('depd')('send')
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var destroy = require('destroy')
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var escapeHtml = require('escape-html')
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, parseRange = require('range-parser')
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, Stream = require('stream')
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, mime = require('mime')
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, fresh = require('fresh')
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, path = require('path')
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, fs = require('fs')
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, normalize = path.normalize
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, join = path.join
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var etag = require('etag')
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var EventEmitter = require('events').EventEmitter;
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var ms = require('ms');
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var onFinished = require('on-finished')
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var statuses = require('statuses')
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/**
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* Variables.
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*/
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var extname = path.extname
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var maxMaxAge = 60 * 60 * 24 * 365 * 1000; // 1 year
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var resolve = path.resolve
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var sep = path.sep
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var toString = Object.prototype.toString
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var upPathRegexp = /(?:^|[\\\/])\.\.(?:[\\\/]|$)/
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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 = send
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module.exports.mime = mime
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/**
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* Shim EventEmitter.listenerCount for node.js < 0.10
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*/
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/* istanbul ignore next */
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var listenerCount = EventEmitter.listenerCount
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|| function(emitter, type){ return emitter.listeners(type).length; };
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/**
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* Return a `SendStream` for `req` and `path`.
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*
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* @param {object} req
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* @param {string} path
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* @param {object} [options]
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* @return {SendStream}
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* @public
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*/
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function send(req, path, options) {
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return new SendStream(req, path, options);
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}
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/**
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* Initialize a `SendStream` with the given `path`.
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*
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* @param {Request} req
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* @param {String} path
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* @param {object} [options]
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* @private
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*/
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function SendStream(req, path, options) {
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var opts = options || {}
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this.options = opts
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this.path = path
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this.req = req
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this._etag = opts.etag !== undefined
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? Boolean(opts.etag)
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: true
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this._dotfiles = opts.dotfiles !== undefined
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? opts.dotfiles
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: 'ignore'
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if (this._dotfiles !== 'ignore' && this._dotfiles !== 'allow' && this._dotfiles !== 'deny') {
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throw new TypeError('dotfiles option must be "allow", "deny", or "ignore"')
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}
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this._hidden = Boolean(opts.hidden)
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if (opts.hidden !== undefined) {
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deprecate('hidden: use dotfiles: \'' + (this._hidden ? 'allow' : 'ignore') + '\' instead')
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}
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// legacy support
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if (opts.dotfiles === undefined) {
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this._dotfiles = undefined
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}
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this._extensions = opts.extensions !== undefined
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? normalizeList(opts.extensions, 'extensions option')
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: []
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this._index = opts.index !== undefined
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? normalizeList(opts.index, 'index option')
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: ['index.html']
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this._lastModified = opts.lastModified !== undefined
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? Boolean(opts.lastModified)
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: true
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this._maxage = opts.maxAge || opts.maxage
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this._maxage = typeof this._maxage === 'string'
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? ms(this._maxage)
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: Number(this._maxage)
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this._maxage = !isNaN(this._maxage)
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? Math.min(Math.max(0, this._maxage), maxMaxAge)
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: 0
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this._root = opts.root
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? resolve(opts.root)
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: null
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if (!this._root && opts.from) {
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this.from(opts.from)
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}
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}
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/**
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* Inherits from `Stream.prototype`.
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*/
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SendStream.prototype.__proto__ = Stream.prototype;
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/**
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* Enable or disable etag generation.
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*
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* @param {Boolean} val
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* @return {SendStream}
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* @api public
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*/
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SendStream.prototype.etag = deprecate.function(function etag(val) {
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val = Boolean(val);
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debug('etag %s', val);
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this._etag = val;
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return this;
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}, 'send.etag: pass etag as option');
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/**
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* Enable or disable "hidden" (dot) files.
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*
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* @param {Boolean} path
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* @return {SendStream}
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* @api public
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*/
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SendStream.prototype.hidden = deprecate.function(function hidden(val) {
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val = Boolean(val);
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debug('hidden %s', val);
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this._hidden = val;
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this._dotfiles = undefined
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return this;
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}, 'send.hidden: use dotfiles option');
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/**
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* Set index `paths`, set to a falsy
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* value to disable index support.
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*
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* @param {String|Boolean|Array} paths
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* @return {SendStream}
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* @api public
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*/
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SendStream.prototype.index = deprecate.function(function index(paths) {
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var index = !paths ? [] : normalizeList(paths, 'paths argument');
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debug('index %o', paths);
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this._index = index;
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return this;
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}, 'send.index: pass index as option');
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/**
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* Set root `path`.
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*
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* @param {String} path
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* @return {SendStream}
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* @api public
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*/
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SendStream.prototype.root = function(path){
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path = String(path);
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this._root = resolve(path)
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return this;
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};
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SendStream.prototype.from = deprecate.function(SendStream.prototype.root,
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'send.from: pass root as option');
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SendStream.prototype.root = deprecate.function(SendStream.prototype.root,
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'send.root: pass root as option');
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/**
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* Set max-age to `maxAge`.
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*
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* @param {Number} maxAge
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* @return {SendStream}
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* @api public
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*/
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SendStream.prototype.maxage = deprecate.function(function maxage(maxAge) {
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maxAge = typeof maxAge === 'string'
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? ms(maxAge)
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: Number(maxAge);
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if (isNaN(maxAge)) maxAge = 0;
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if (Infinity == maxAge) maxAge = 60 * 60 * 24 * 365 * 1000;
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debug('max-age %d', maxAge);
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this._maxage = maxAge;
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return this;
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}, 'send.maxage: pass maxAge as option');
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/**
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* Emit error with `status`.
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*
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* @param {number} status
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* @param {Error} [error]
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* @private
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*/
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SendStream.prototype.error = function error(status, error) {
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// emit if listeners instead of responding
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if (listenerCount(this, 'error') !== 0) {
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return this.emit('error', createError(error, status, {
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expose: false
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}))
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}
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var res = this.res
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var msg = statuses[status]
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// wipe all existing headers
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res._headers = null
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// send basic response
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res.statusCode = status
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res.setHeader('Content-Type', 'text/plain; charset=UTF-8')
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res.setHeader('Content-Length', Buffer.byteLength(msg))
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res.setHeader('X-Content-Type-Options', 'nosniff')
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res.end(msg)
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}
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/**
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* Check if the pathname ends with "/".
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*
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* @return {Boolean}
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* @api private
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*/
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SendStream.prototype.hasTrailingSlash = function(){
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return '/' == this.path[this.path.length - 1];
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};
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/**
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* Check if this is a conditional GET request.
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*
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* @return {Boolean}
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* @api private
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*/
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SendStream.prototype.isConditionalGET = function(){
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return this.req.headers['if-none-match']
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|| this.req.headers['if-modified-since'];
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};
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/**
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* Strip content-* header fields.
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*
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* @private
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*/
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SendStream.prototype.removeContentHeaderFields = function removeContentHeaderFields() {
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var res = this.res
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var headers = Object.keys(res._headers || {})
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for (var i = 0; i < headers.length; i++) {
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var header = headers[i]
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if (header.substr(0, 8) === 'content-' && header !== 'content-location') {
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res.removeHeader(header)
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}
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}
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}
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/**
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* Respond with 304 not modified.
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*
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* @api private
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*/
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SendStream.prototype.notModified = function(){
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var res = this.res;
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debug('not modified');
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this.removeContentHeaderFields();
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res.statusCode = 304;
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res.end();
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};
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/**
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* Raise error that headers already sent.
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*
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* @api private
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*/
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SendStream.prototype.headersAlreadySent = function headersAlreadySent(){
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var err = new Error('Can\'t set headers after they are sent.');
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debug('headers already sent');
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this.error(500, err);
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};
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/**
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* Check if the request is cacheable, aka
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* responded with 2xx or 304 (see RFC 2616 section 14.2{5,6}).
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*
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* @return {Boolean}
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* @api private
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*/
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SendStream.prototype.isCachable = function(){
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var res = this.res;
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return (res.statusCode >= 200 && res.statusCode < 300) || 304 == res.statusCode;
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};
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/**
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* Handle stat() error.
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*
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* @param {Error} error
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* @private
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*/
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SendStream.prototype.onStatError = function onStatError(error) {
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switch (error.code) {
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case 'ENAMETOOLONG':
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case 'ENOENT':
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case 'ENOTDIR':
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this.error(404, error)
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break
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default:
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this.error(500, error)
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break
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}
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}
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/**
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* Check if the cache is fresh.
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*
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* @return {Boolean}
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* @api private
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*/
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SendStream.prototype.isFresh = function(){
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return fresh(this.req.headers, this.res._headers);
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};
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/**
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* Check if the range is fresh.
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*
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* @return {Boolean}
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* @api private
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*/
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SendStream.prototype.isRangeFresh = function isRangeFresh(){
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var ifRange = this.req.headers['if-range'];
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if (!ifRange) return true;
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return ~ifRange.indexOf('"')
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? ~ifRange.indexOf(this.res._headers['etag'])
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: Date.parse(this.res._headers['last-modified']) <= Date.parse(ifRange);
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};
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/**
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* Redirect to path.
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*
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* @param {string} path
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* @private
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*/
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SendStream.prototype.redirect = function redirect(path) {
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if (listenerCount(this, 'directory') !== 0) {
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this.emit('directory')
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return
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}
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if (this.hasTrailingSlash()) {
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this.error(403)
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return
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}
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var loc = path + '/'
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var msg = 'Redirecting to <a href="' + escapeHtml(loc) + '">' + escapeHtml(loc) + '</a>\n'
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var res = this.res
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// redirect
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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(msg))
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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(msg)
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}
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/**
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* Pipe to `res.
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*
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* @param {Stream} res
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* @return {Stream} res
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* @api public
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*/
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SendStream.prototype.pipe = function(res){
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var self = this
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, args = arguments
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, root = this._root;
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// references
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this.res = res;
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// decode the path
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var path = decode(this.path)
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if (path === -1) return this.error(400)
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// null byte(s)
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if (~path.indexOf('\0')) return this.error(400);
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var parts
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if (root !== null) {
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// malicious path
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if (upPathRegexp.test(normalize('.' + sep + path))) {
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debug('malicious path "%s"', path)
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return this.error(403)
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}
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// join / normalize from optional root dir
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path = normalize(join(root, path))
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root = normalize(root + sep)
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// explode path parts
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parts = path.substr(root.length).split(sep)
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} else {
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// ".." is malicious without "root"
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if (upPathRegexp.test(path)) {
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debug('malicious path "%s"', path)
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return this.error(403)
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}
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// explode path parts
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parts = normalize(path).split(sep)
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// resolve the path
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path = resolve(path)
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}
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// dotfile handling
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if (containsDotFile(parts)) {
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var access = this._dotfiles
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// legacy support
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if (access === undefined) {
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access = parts[parts.length - 1][0] === '.'
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? (this._hidden ? 'allow' : 'ignore')
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: 'allow'
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}
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debug('%s dotfile "%s"', access, path)
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switch (access) {
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case 'allow':
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break
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case 'deny':
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return this.error(403)
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case 'ignore':
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default:
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return this.error(404)
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}
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}
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// index file support
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if (this._index.length && this.path[this.path.length - 1] === '/') {
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this.sendIndex(path);
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return res;
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}
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this.sendFile(path);
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return res;
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};
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|
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/**
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* Transfer `path`.
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*
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* @param {String} path
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* @api public
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*/
|
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|
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SendStream.prototype.send = function(path, stat){
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var len = stat.size;
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var options = this.options
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var opts = {}
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var res = this.res;
|
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var req = this.req;
|
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var ranges = req.headers.range;
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var offset = options.start || 0;
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if (res._header) {
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// impossible to send now
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return this.headersAlreadySent();
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}
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debug('pipe "%s"', path)
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|
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// set header fields
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this.setHeader(path, stat);
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|
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// set content-type
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this.type(path);
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|
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// conditional GET support
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if (this.isConditionalGET()
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&& this.isCachable()
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&& this.isFresh()) {
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return this.notModified();
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}
|
|
|
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// adjust len to start/end options
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len = Math.max(0, len - offset);
|
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if (options.end !== undefined) {
|
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var bytes = options.end - offset + 1;
|
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if (len > bytes) len = bytes;
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}
|
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|
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// Range support
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if (ranges) {
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ranges = parseRange(len, ranges);
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|
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// If-Range support
|
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if (!this.isRangeFresh()) {
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debug('range stale');
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ranges = -2;
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}
|
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|
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// unsatisfiable
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if (-1 == ranges) {
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debug('range unsatisfiable');
|
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res.setHeader('Content-Range', 'bytes */' + stat.size);
|
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return this.error(416);
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}
|
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|
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// valid (syntactically invalid/multiple ranges are treated as a regular response)
|
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if (-2 != ranges && ranges.length === 1) {
|
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debug('range %j', ranges);
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|
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// Content-Range
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res.statusCode = 206;
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res.setHeader('Content-Range', 'bytes '
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+ ranges[0].start
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+ '-'
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+ ranges[0].end
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+ '/'
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+ len);
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|
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offset += ranges[0].start;
|
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len = ranges[0].end - ranges[0].start + 1;
|
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}
|
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}
|
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|
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// clone options
|
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for (var prop in options) {
|
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opts[prop] = options[prop]
|
|
}
|
|
|
|
// set read options
|
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opts.start = offset
|
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opts.end = Math.max(offset, offset + len - 1)
|
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|
|
// content-length
|
|
res.setHeader('Content-Length', len);
|
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|
|
// HEAD support
|
|
if ('HEAD' == req.method) return res.end();
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|
|
this.stream(path, opts)
|
|
};
|
|
|
|
/**
|
|
* Transfer file for `path`.
|
|
*
|
|
* @param {String} path
|
|
* @api private
|
|
*/
|
|
SendStream.prototype.sendFile = function sendFile(path) {
|
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var i = 0
|
|
var self = this
|
|
|
|
debug('stat "%s"', path);
|
|
fs.stat(path, function onstat(err, stat) {
|
|
if (err && err.code === 'ENOENT'
|
|
&& !extname(path)
|
|
&& path[path.length - 1] !== sep) {
|
|
// not found, check extensions
|
|
return next(err)
|
|
}
|
|
if (err) return self.onStatError(err)
|
|
if (stat.isDirectory()) return self.redirect(self.path)
|
|
self.emit('file', path, stat)
|
|
self.send(path, stat)
|
|
})
|
|
|
|
function next(err) {
|
|
if (self._extensions.length <= i) {
|
|
return err
|
|
? self.onStatError(err)
|
|
: self.error(404)
|
|
}
|
|
|
|
var p = path + '.' + self._extensions[i++]
|
|
|
|
debug('stat "%s"', p)
|
|
fs.stat(p, function (err, stat) {
|
|
if (err) return next(err)
|
|
if (stat.isDirectory()) return next()
|
|
self.emit('file', p, stat)
|
|
self.send(p, stat)
|
|
})
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Transfer index for `path`.
|
|
*
|
|
* @param {String} path
|
|
* @api private
|
|
*/
|
|
SendStream.prototype.sendIndex = function sendIndex(path){
|
|
var i = -1;
|
|
var self = this;
|
|
|
|
function next(err){
|
|
if (++i >= self._index.length) {
|
|
if (err) return self.onStatError(err);
|
|
return self.error(404);
|
|
}
|
|
|
|
var p = join(path, self._index[i]);
|
|
|
|
debug('stat "%s"', p);
|
|
fs.stat(p, function(err, stat){
|
|
if (err) return next(err);
|
|
if (stat.isDirectory()) return next();
|
|
self.emit('file', p, stat);
|
|
self.send(p, stat);
|
|
});
|
|
}
|
|
|
|
next();
|
|
};
|
|
|
|
/**
|
|
* Stream `path` to the response.
|
|
*
|
|
* @param {String} path
|
|
* @param {Object} options
|
|
* @api private
|
|
*/
|
|
|
|
SendStream.prototype.stream = function(path, options){
|
|
// TODO: this is all lame, refactor meeee
|
|
var finished = false;
|
|
var self = this;
|
|
var res = this.res;
|
|
var req = this.req;
|
|
|
|
// pipe
|
|
var stream = fs.createReadStream(path, options);
|
|
this.emit('stream', stream);
|
|
stream.pipe(res);
|
|
|
|
// response finished, done with the fd
|
|
onFinished(res, function onfinished(){
|
|
finished = true;
|
|
destroy(stream);
|
|
});
|
|
|
|
// error handling code-smell
|
|
stream.on('error', function onerror(err){
|
|
// request already finished
|
|
if (finished) return;
|
|
|
|
// clean up stream
|
|
finished = true;
|
|
destroy(stream);
|
|
|
|
// error
|
|
self.onStatError(err);
|
|
});
|
|
|
|
// end
|
|
stream.on('end', function onend(){
|
|
self.emit('end');
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Set content-type based on `path`
|
|
* if it hasn't been explicitly set.
|
|
*
|
|
* @param {String} path
|
|
* @api private
|
|
*/
|
|
|
|
SendStream.prototype.type = function(path){
|
|
var res = this.res;
|
|
if (res.getHeader('Content-Type')) return;
|
|
var type = mime.lookup(path);
|
|
var charset = mime.charsets.lookup(type);
|
|
debug('content-type %s', type);
|
|
res.setHeader('Content-Type', type + (charset ? '; charset=' + charset : ''));
|
|
};
|
|
|
|
/**
|
|
* Set response header fields, most
|
|
* fields may be pre-defined.
|
|
*
|
|
* @param {String} path
|
|
* @param {Object} stat
|
|
* @api private
|
|
*/
|
|
|
|
SendStream.prototype.setHeader = function setHeader(path, stat){
|
|
var res = this.res;
|
|
|
|
this.emit('headers', res, path, stat);
|
|
|
|
if (!res.getHeader('Accept-Ranges')) res.setHeader('Accept-Ranges', 'bytes');
|
|
if (!res.getHeader('Cache-Control')) res.setHeader('Cache-Control', 'public, max-age=' + Math.floor(this._maxage / 1000));
|
|
|
|
if (this._lastModified && !res.getHeader('Last-Modified')) {
|
|
var modified = stat.mtime.toUTCString()
|
|
debug('modified %s', modified)
|
|
res.setHeader('Last-Modified', modified)
|
|
}
|
|
|
|
if (this._etag && !res.getHeader('ETag')) {
|
|
var val = etag(stat)
|
|
debug('etag %s', val)
|
|
res.setHeader('ETag', val)
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Determine if path parts contain a dotfile.
|
|
*
|
|
* @api private
|
|
*/
|
|
|
|
function containsDotFile(parts) {
|
|
for (var i = 0; i < parts.length; i++) {
|
|
if (parts[i][0] === '.') {
|
|
return true
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
/**
|
|
* decodeURIComponent.
|
|
*
|
|
* Allows V8 to only deoptimize this fn instead of all
|
|
* of send().
|
|
*
|
|
* @param {String} path
|
|
* @api private
|
|
*/
|
|
|
|
function decode(path) {
|
|
try {
|
|
return decodeURIComponent(path)
|
|
} catch (err) {
|
|
return -1
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Normalize the index option into an array.
|
|
*
|
|
* @param {boolean|string|array} val
|
|
* @param {string} name
|
|
* @private
|
|
*/
|
|
|
|
function normalizeList(val, name) {
|
|
var list = [].concat(val || [])
|
|
|
|
for (var i = 0; i < list.length; i++) {
|
|
if (typeof list[i] !== 'string') {
|
|
throw new TypeError(name + ' must be array of strings or false')
|
|
}
|
|
}
|
|
|
|
return list
|
|
}
|