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