630 lines
12 KiB
JavaScript
630 lines
12 KiB
JavaScript
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'use strict';
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/**
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* Module dependencies.
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*/
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var net = require('net');
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var contentType = require('content-type');
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var stringify = require('url').format;
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var parse = require('parseurl');
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var qs = require('querystring');
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var typeis = require('type-is');
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var fresh = require('fresh');
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/**
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* Prototype.
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*/
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module.exports = {
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/**
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* Return request header.
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*
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* @return {Object}
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* @api public
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*/
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get header() {
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return this.req.headers;
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},
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/**
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* Return request header, alias as request.header
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*
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* @return {Object}
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* @api public
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*/
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get headers() {
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return this.req.headers;
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},
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/**
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* Get request URL.
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*
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* @return {String}
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* @api public
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*/
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get url() {
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return this.req.url;
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},
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/**
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* Set request URL.
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*
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* @api public
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*/
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set url(val) {
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this.req.url = val;
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},
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/**
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* Get origin of URL.
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*
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* @return {String}
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* @api public
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*/
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get origin() {
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return this.protocol + '://' + this.host;
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},
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/**
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* Get full request URL.
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*
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* @return {String}
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* @api public
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*/
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get href() {
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// support: `GET http://example.com/foo`
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if (/^https?:\/\//i.test(this.originalUrl)) {
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return this.originalUrl;
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}
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return this.origin + this.originalUrl;
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},
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/**
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* Get request method.
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*
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* @return {String}
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* @api public
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*/
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get method() {
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return this.req.method;
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},
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/**
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* Set request method.
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*
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* @param {String} val
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* @api public
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*/
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set method(val) {
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this.req.method = val;
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},
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/**
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* Get request pathname.
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*
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* @return {String}
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* @api public
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*/
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get path() {
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return parse(this.req).pathname;
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},
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/**
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* Set pathname, retaining the query-string when present.
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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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set path(path) {
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var url = parse(this.req);
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if (url.pathname === path) return;
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url.pathname = path;
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url.path = null;
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this.url = stringify(url);
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},
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/**
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* Get parsed query-string.
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*
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* @return {Object}
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* @api public
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*/
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get query() {
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var str = this.querystring;
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var c = this._querycache = this._querycache || {};
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return c[str] || (c[str] = qs.parse(str));
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},
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/**
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* Set query-string as an object.
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*
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* @param {Object} obj
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* @api public
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*/
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set query(obj) {
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this.querystring = qs.stringify(obj);
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},
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/**
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* Get query string.
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*
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* @return {String}
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* @api public
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*/
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get querystring() {
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if (!this.req) return '';
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return parse(this.req).query || '';
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},
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/**
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* Set querystring.
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*
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* @param {String} str
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* @api public
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*/
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set querystring(str) {
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var url = parse(this.req);
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if (url.search === '?' + str) return;
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url.search = str;
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url.path = null;
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this.url = stringify(url);
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},
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/**
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* Get the search string. Same as the querystring
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* except it includes the leading ?.
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*
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* @return {String}
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* @api public
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*/
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get search() {
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if (!this.querystring) return '';
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return '?' + this.querystring;
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},
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/**
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* Set the search string. Same as
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* response.querystring= but included for ubiquity.
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*
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* @param {String} str
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* @api public
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*/
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set search(str) {
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this.querystring = str;
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},
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/**
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* Parse the "Host" header field host
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* and support X-Forwarded-Host when a
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* proxy is enabled.
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*
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* @return {String} hostname:port
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* @api public
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*/
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get host() {
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var proxy = this.app.proxy;
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var host = proxy && this.get('X-Forwarded-Host');
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host = host || this.get('Host');
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if (!host) return '';
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return host.split(/\s*,\s*/)[0];
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},
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/**
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* Parse the "Host" header field hostname
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* and support X-Forwarded-Host when a
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* proxy is enabled.
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*
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* @return {String} hostname
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* @api public
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*/
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get hostname() {
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var host = this.host;
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if (!host) return '';
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return host.split(':')[0];
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},
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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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* @api public
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*/
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get fresh() {
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var method = this.method;
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var s = this.ctx.status;
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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 ((s >= 200 && s < 300) || 304 == s) {
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return fresh(this.header, this.ctx.response.header);
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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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* @api public
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*/
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get stale() {
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return !this.fresh;
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},
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/**
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* Check if the request is idempotent.
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*
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* @return {Boolean}
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* @api public
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*/
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get idempotent() {
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var methods = ['GET', 'HEAD', 'PUT', 'DELETE', 'OPTIONS', 'TRACE'];
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return !!~methods.indexOf(this.method);
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},
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/**
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* Return the request socket.
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*
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* @return {Connection}
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* @api public
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*/
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get socket() {
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return this.req.socket;
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},
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/**
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* Get the charset when present or undefined.
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*
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* @return {String}
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* @api public
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*/
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get charset() {
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var type = this.get('Content-Type');
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if (!type) return '';
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return contentType.parse(type).parameters.charset || '';
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},
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/**
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* Return parsed Content-Length when present.
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*
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* @return {Number}
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* @api public
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*/
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get length() {
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var len = this.get('Content-Length');
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if (len == '') return;
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return ~~len;
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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 proxy setting
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* is enabled the "X-Forwarded-Proto" header
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* field will be trusted. If you're running behind
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* a reverse proxy that supplies https for you this
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* may be enabled.
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*
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* @return {String}
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* @api public
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*/
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get protocol() {
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var proxy = this.app.proxy;
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if (this.socket.encrypted) return 'https';
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if (!proxy) return 'http';
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var proto = this.get('X-Forwarded-Proto') || 'http';
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return proto.split(/\s*,\s*/)[0];
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},
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/**
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* Short-hand for:
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*
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* this.protocol == 'https'
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*
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* @return {Boolean}
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* @api public
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*/
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get secure() {
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return 'https' == this.protocol;
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},
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/**
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* Return the remote address, or when
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* `app.proxy` is `true` return
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* the upstream addr.
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*
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* @return {String}
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* @api public
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*/
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get ip() {
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return this.ips[0] || this.socket.remoteAddress || '';
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},
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/**
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* When `app.proxy` is `true`, parse
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* the "X-Forwarded-For" ip address list.
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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.
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*
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* @return {Array}
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* @api public
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*/
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get ips() {
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var proxy = this.app.proxy;
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var val = this.get('X-Forwarded-For');
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return proxy && val
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? val.split(/\s*,\s*/)
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: [];
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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 `app.subdomainOffset`.
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*
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* For example, if the domain is "tobi.ferrets.example.com":
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* If `app.subdomainOffset` is not set, this.subdomains is `["ferrets", "tobi"]`.
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* If `app.subdomainOffset` is 3, this.subdomains is `["tobi"]`.
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*
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* @return {Array}
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* @api public
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*/
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get subdomains() {
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var offset = this.app.subdomainOffset;
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var hostname = this.hostname;
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if (net.isIP(hostname)) return [];
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return hostname
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.split('.')
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.reverse()
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.slice(offset);
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},
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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", the extension name
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* such as "json" 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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* this.accepts('html');
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* // => "html"
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*
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* // Accept: text/*, application/json
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* this.accepts('html');
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* // => "html"
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* this.accepts('text/html');
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* // => "text/html"
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* this.accepts('json', 'text');
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* // => "json"
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* this.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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* this.accepts('image/png');
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* this.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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* this.accepts(['html', 'json']);
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* this.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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* @api public
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*/
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accepts: function(){
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return this.accept.types.apply(this.accept, arguments);
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},
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/**
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* Return accepted encodings or best fit based on `encodings`.
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*
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* Given `Accept-Encoding: gzip, deflate`
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* an array sorted by quality is returned:
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*
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* ['gzip', 'deflate']
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*
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* @param {String|Array} encoding(s)...
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* @return {String|Array}
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* @api public
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*/
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acceptsEncodings: function(){
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return this.accept.encodings.apply(this.accept, arguments);
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},
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/**
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* Return accepted charsets or best fit based on `charsets`.
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*
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* Given `Accept-Charset: utf-8, iso-8859-1;q=0.2, utf-7;q=0.5`
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* an array sorted by quality is returned:
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*
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* ['utf-8', 'utf-7', 'iso-8859-1']
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*
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* @param {String|Array} charset(s)...
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* @return {String|Array}
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* @api public
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*/
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acceptsCharsets: function(){
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return this.accept.charsets.apply(this.accept, arguments);
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},
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/**
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* Return accepted languages or best fit based on `langs`.
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*
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* Given `Accept-Language: en;q=0.8, es, pt`
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* an array sorted by quality is returned:
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*
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* ['es', 'pt', 'en']
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*
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* @param {String|Array} lang(s)...
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* @return {Array|String}
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* @api public
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*/
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acceptsLanguages: function(){
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return this.accept.languages.apply(this.accept, arguments);
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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 any of the give mime `type`s.
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* If there is no request body, `null` is returned.
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* If there is no content type, `false` is returned.
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* Otherwise, it returns the first `type` that matches.
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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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* this.is('html'); // => 'html'
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* this.is('text/html'); // => 'text/html'
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* this.is('text/*', 'application/json'); // => 'text/html'
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*
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* // When Content-Type is application/json
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* this.is('json', 'urlencoded'); // => 'json'
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* this.is('application/json'); // => 'application/json'
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* this.is('html', 'application/*'); // => 'application/json'
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*
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* this.is('html'); // => 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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* @api public
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*/
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is: function(types){
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if (!types) return typeis(this.req);
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if (!Array.isArray(types)) types = [].slice.call(arguments);
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return typeis(this.req, types);
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},
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/**
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* Return the request mime type void of
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* parameters such as "charset".
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*
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* @return {String}
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* @api public
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*/
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get type() {
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var type = this.get('Content-Type');
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if (!type) return '';
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return type.split(';')[0];
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},
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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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* this.get('Content-Type');
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* // => "text/plain"
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*
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* this.get('content-type');
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* // => "text/plain"
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*
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* this.get('Something');
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* // => undefined
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*
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* @param {String} field
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* @return {String}
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* @api public
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*/
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get: function(field){
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var req = this.req;
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switch (field = field.toLowerCase()) {
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case 'referer':
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case 'referrer':
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return req.headers.referrer || req.headers.referer || '';
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default:
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return req.headers[field] || '';
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}
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},
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/**
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* Inspect implementation.
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*
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* @return {Object}
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* @api public
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*/
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inspect: function(){
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if (!this.req) return;
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return this.toJSON();
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},
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/**
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* Return JSON representation.
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*
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* @return {Object}
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* @api public
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*/
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toJSON: function(){
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return {
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method: this.method,
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url: this.url,
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header: this.header
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};
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}
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};
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