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* express * Copyright(c) 2009-2013 TJ Holowaychuk * Copyright(c) 2013 Roman Shtylman * Copyright(c) 2014-2015 Douglas Christopher Wilson * MIT Licensed */ 'use strict'; /** * Module dependencies. * @private */ var accepts = require('accepts'); var deprecate = require('depd')('express'); var isIP = require('net').isIP; var typeis = require('type-is'); var http = require('http'); var fresh = require('fresh'); var parseRange = require('range-parser'); var parse = require('parseurl'); var proxyaddr = require('proxy-addr'); /** * Request prototype. * @public */ var req = Object.create(http.IncomingMessage.prototype) /** * Module exports. * @public */ module.exports = req /** * Return request header. * * The `Referrer` header field is special-cased, * both `Referrer` and `Referer` are interchangeable. * * Examples: * * req.get('Content-Type'); * // => "text/plain" * * req.get('content-type'); * // => "text/plain" * * req.get('Something'); * // => undefined * * Aliased as `req.header()`. * * @param {String} name * @return {String} * @public */ req.get = req.header = function header(name) { if (!name) { throw new TypeError('name argument is required to req.get'); } if (typeof name !== 'string') { throw new TypeError('name must be a string to req.get'); } var lc = name.toLowerCase(); switch (lc) { case 'referer': case 'referrer': return this.headers.referrer || this.headers.referer; default: return this.headers[lc]; } }; /** * To do: update docs. * * Check if the given `type(s)` is acceptable, returning * the best match when true, otherwise `undefined`, in which * case you should respond with 406 "Not Acceptable". * * The `type` value may be a single MIME type string * such as "application/json", an extension name * such as "json", a comma-delimited list such as "json, html, text/plain", * an argument list such as `"json", "html", "text/plain"`, * or an array `["json", "html", "text/plain"]`. When a list * or array is given, the _best_ match, if any is returned. * * Examples: * * // Accept: text/html * req.accepts('html'); * // => "html" * * // Accept: text/*, application/json * req.accepts('html'); * // => "html" * req.accepts('text/html'); * // => "text/html" * req.accepts('json, text'); * // => "json" * req.accepts('application/json'); * // => "application/json" * * // Accept: text/*, application/json * req.accepts('image/png'); * req.accepts('png'); * // => undefined * * // Accept: text/*;q=.5, application/json * req.accepts(['html', 'json']); * req.accepts('html', 'json'); * req.accepts('html, json'); * // => "json" * * @param {String|Array} type(s) * @return {String|Array|Boolean} * @public */ req.accepts = function(){ var accept = accepts(this); return accept.types.apply(accept, arguments); }; /** * Check if the given `encoding`s are accepted. * * @param {String} ...encoding * @return {String|Array} * @public */ req.acceptsEncodings = function(){ var accept = accepts(this); return accept.encodings.apply(accept, arguments); }; req.acceptsEncoding = deprecate.function(req.acceptsEncodings, 'req.acceptsEncoding: Use acceptsEncodings instead'); /** * Check if the given `charset`s are acceptable, * otherwise you should respond with 406 "Not Acceptable". * * @param {String} ...charset * @return {String|Array} * @public */ req.acceptsCharsets = function(){ var accept = accepts(this); return accept.charsets.apply(accept, arguments); }; req.acceptsCharset = deprecate.function(req.acceptsCharsets, 'req.acceptsCharset: Use acceptsCharsets instead'); /** * Check if the given `lang`s are acceptable, * otherwise you should respond with 406 "Not Acceptable". * * @param {String} ...lang * @return {String|Array} * @public */ req.acceptsLanguages = function(){ var accept = accepts(this); return accept.languages.apply(accept, arguments); }; req.acceptsLanguage = deprecate.function(req.acceptsLanguages, 'req.acceptsLanguage: Use acceptsLanguages instead'); /** * Parse Range header field, capping to the given `size`. * * Unspecified ranges such as "0-" require knowledge of your resource length. In * the case of a byte range this is of course the total number of bytes. If the * Range header field is not given `undefined` is returned, `-1` when unsatisfiable, * and `-2` when syntactically invalid. * * When ranges are returned, the array has a "type" property which is the type of * range that is required (most commonly, "bytes"). Each array element is an object * with a "start" and "end" property for the portion of the range. * * The "combine" option can be set to `true` and overlapping & adjacent ranges * will be combined into a single range. * * NOTE: remember that ranges are inclusive, so for example "Range: users=0-3" * should respond with 4 users when available, not 3. * * @param {number} size * @param {object} [options] * @param {boolean} [options.combine=false] * @return {number|array} * @public */ req.range = function range(size, options) { var range = this.get('Range'); if (!range) return; return parseRange(size, range, options); }; /** * Return the value of param `name` when present or `defaultValue`. * * - Checks route placeholders, ex: _/user/:id_ * - Checks body params, ex: id=12, {"id":12} * - Checks query string params, ex: ?id=12 * * To utilize request bodies, `req.body` * should be an object. This can be done by using * the `bodyParser()` middleware. * * @param {String} name * @param {Mixed} [defaultValue] * @return {String} * @public */ req.param = function param(name, defaultValue) { var params = this.params || {}; var body = this.body || {}; var query = this.query || {}; var args = arguments.length === 1 ? 'name' : 'name, default'; deprecate('req.param(' + args + '): Use req.params, req.body, or req.query instead'); if (null != params[name] && params.hasOwnProperty(name)) return params[name]; if (null != body[name]) return body[name]; if (null != query[name]) return query[name]; return defaultValue; }; /** * Check if the incoming request contains the "Content-Type" * header field, and it contains the give mime `type`. * * Examples: * * // With Content-Type: text/html; charset=utf-8 * req.is('html'); * req.is('text/html'); * req.is('text/*'); * // => true * * // When Content-Type is application/json * req.is('json'); * req.is('application/json'); * req.is('application/*'); * // => true * * req.is('html'); * // => false * * @param {String|Array} types... * @return {String|false|null} * @public */ req.is = function is(types) { var arr = types; // support flattened arguments if (!Array.isArray(types)) { arr = new Array(arguments.length); for (var i = 0; i < arr.length; i++) { arr[i] = arguments[i]; } } return typeis(this, arr); }; /** * Return the protocol string "http" or "https" * when requested with TLS. When the "trust proxy" * setting trusts the socket address, the * "X-Forwarded-Proto" header field will be trusted * and used if present. * * If you're running behind a reverse proxy that * supplies https for you this may be enabled. * * @return {String} * @public */ defineGetter(req, 'protocol', function protocol(){ var proto = this.connection.encrypted ? 'https' : 'http'; var trust = this.app.get('trust proxy fn'); if (!trust(this.connection.remoteAddress, 0)) { return proto; } // Note: X-Forwarded-Proto is normally only ever a // single value, but this is to be safe. var header = this.get('X-Forwarded-Proto') || proto var index = header.indexOf(',') return index !== -1 ? header.substring(0, index).trim() : header.trim() }); /** * Short-hand for: * * req.protocol === 'https' * * @return {Boolean} * @public */ defineGetter(req, 'secure', function secure(){ return this.protocol === 'https'; }); /** * Return the remote address from the trusted proxy. * * The is the remote address on the socket unless * "trust proxy" is set. * * @return {String} * @public */ defineGetter(req, 'ip', function ip(){ var trust = this.app.get('trust proxy fn'); return proxyaddr(this, trust); }); /** * When "trust proxy" is set, trusted proxy addresses + client. * * For example if the value were "client, proxy1, proxy2" * you would receive the array `["client", "proxy1", "proxy2"]` * where "proxy2" is the furthest down-stream and "proxy1" and * "proxy2" were trusted. * * @return {Array} * @public */ defineGetter(req, 'ips', function ips() { var trust = this.app.get('trust proxy fn'); var addrs = proxyaddr.all(this, trust); // reverse the order (to farthest -> closest) // and remove socket address addrs.reverse().pop() return addrs }); /** * Return subdomains as an array. * * Subdomains are the dot-separated parts of the host before the main domain of * the app. By default, the domain of the app is assumed to be the last two * parts of the host. This can be changed by setting "subdomain offset". * * For example, if the domain is "tobi.ferrets.example.com": * If "subdomain offset" is not set, req.subdomains is `["ferrets", "tobi"]`. * If "subdomain offset" is 3, req.subdomains is `["tobi"]`. * * @return {Array} * @public */ defineGetter(req, 'subdomains', function subdomains() { var hostname = this.hostname; if (!hostname) return []; var offset = this.app.get('subdomain offset'); var subdomains = !isIP(hostname) ? hostname.split('.').reverse() : [hostname]; return subdomains.slice(offset); }); /** * Short-hand for `url.parse(req.url).pathname`. * * @return {String} * @public */ defineGetter(req, 'path', function path() { return parse(this).pathname; }); /** * Parse the "Host" header field to a hostname. * * When the "trust proxy" setting trusts the socket * address, the "X-Forwarded-Host" header field will * be trusted. * * @return {String} * @public */ defineGetter(req, 'hostname', function hostname(){ var trust = this.app.get('trust proxy fn'); var host = this.get('X-Forwarded-Host'); if (!host || !trust(this.connection.remoteAddress, 0)) { host = this.get('Host'); } else if (host.indexOf(',') !== -1) { // Note: X-Forwarded-Host is normally only ever a // single value, but this is to be safe. host = host.substring(0, host.indexOf(',')).trimRight() } if (!host) return; // IPv6 literal support var offset = host[0] === '[' ? host.indexOf(']') + 1 : 0; var index = host.indexOf(':', offset); return index !== -1 ? host.substring(0, index) : host; }); // TODO: change req.host to return host in next major defineGetter(req, 'host', deprecate.function(function host(){ return this.hostname; }, 'req.host: Use req.hostname instead')); /** * Check if the request is fresh, aka * Last-Modified and/or the ETag * still match. * * @return {Boolean} * @public */ defineGetter(req, 'fresh', function(){ var method = this.method; var res = this.res var status = res.statusCode // GET or HEAD for weak freshness validation only if ('GET' !== method && 'HEAD' !== method) return false; // 2xx or 304 as per rfc2616 14.26 if ((status >= 200 && status < 300) || 304 === status) { return fresh(this.headers, { 'etag': res.get('ETag'), 'last-modified': res.get('Last-Modified') }) } return false; }); /** * Check if the request is stale, aka * "Last-Modified" and / or the "ETag" for the * resource has changed. * * @return {Boolean} * @public */ defineGetter(req, 'stale', function stale(){ return !this.fresh; }); /** * Check if the request was an _XMLHttpRequest_. * * @return {Boolean} * @public */ defineGetter(req, 'xhr', function xhr(){ var val = this.get('X-Requested-With') || ''; return val.toLowerCase() === 'xmlhttprequest'; }); /** * Helper function for creating a getter on an object. * * @param {Object} obj * @param {String} name * @param {Function} getter * @private */ function defineGetter(obj, name, getter) { Object.defineProperty(obj, name, { configurable: true, enumerable: true, get: getter }); }