526 lines
12 KiB
JavaScript
526 lines
12 KiB
JavaScript
/*!
|
|
* 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 given 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
|
|
});
|
|
}
|