656 lines
14 KiB
JavaScript
656 lines
14 KiB
JavaScript
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/**
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* Module dependencies.
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*/
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var debug = require('debug')('koa:context');
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var Negotiator = require('negotiator');
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var statuses = require('./status');
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var qs = require('querystring');
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var Stream = require('stream');
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var fresh = require('fresh');
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var http = require('http');
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var path = require('path');
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var mime = require('mime');
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var basename = path.basename;
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var extname = path.extname;
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var url = require('url');
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var parse = url.parse;
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var stringify = url.format;
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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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* 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 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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var c = this._pathcache = this._pathcache || {};
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return c[this.url] || (c[this.url] = parse(this.url).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.url);
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url.pathname = path;
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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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if (!str) return {};
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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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var c = this._qscache = this._qscache || {};
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return c[this.url] || (c[this.url] = parse(this.url).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.url);
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url.search = str;
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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 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}
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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].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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return 'GET' == this.method
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|| 'HEAD' == 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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// TODO: TLS
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return this.req.socket;
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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 (null == 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(/ *, */)
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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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return (this.host || '')
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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(types){
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if (!Array.isArray(types)) types = [].slice.call(arguments);
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var n = new Negotiator(this.req);
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if (!types.length) return n.preferredMediaTypes();
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if (!this.header.accept) return types[0];
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var mimes = types.map(extToMime);
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var accepts = n.preferredMediaTypes(mimes);
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var first = accepts[0];
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if (!first) return false;
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return types[mimes.indexOf(first)];
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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(encodings) {
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if (!Array.isArray(encodings)) encodings = [].slice.call(arguments);
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var n = new Negotiator(this.req);
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if (!encodings.length) return n.preferredEncodings();
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return n.preferredEncodings(encodings)[0] || 'identity';
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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(charsets) {
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if (!Array.isArray(charsets)) charsets = [].slice.call(arguments);
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var n = new Negotiator(this.req);
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if (!charsets.length) return n.preferredCharsets();
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if (!this.header['accept-charset']) return charsets[0];
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return n.preferredCharsets(charsets)[0] || false;
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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(langs) {
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if (!Array.isArray(langs)) langs = [].slice.call(arguments);
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var n = new Negotiator(this.req);
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if (!langs.length) return n.preferredLanguages();
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if (!this.header['accept-language']) return langs[0];
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return n.preferredLanguages(langs)[0] || false;
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},
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/**
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* Vary on `field`.
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*
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* @param {String} field
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* @api public
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*/
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vary: function(field){
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this.append('Vary', field);
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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/*'
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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/*'
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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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// no request body
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if (!(this.length || 'transfer-encoding' in this.header)) return null;
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var ct = this.type;
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// no content-type
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if (!ct) return false;
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// paramless
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ct = ct.split(';')[0];
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if (!types) return ct;
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// ensure array
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if (!Array.isArray(types)) types = [].slice.call(arguments);
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for (var i = 0; i < types.length; i++) {
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var type = types[i];
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switch (type) {
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case 'urlencoded':
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mt = 'application/x-www-form-urlencoded';
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break;
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default:
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mt = ~type.indexOf('/') ? type : mime.lookup(type);
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}
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if (mimeMatch(mt, ct)) return type;
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}
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// no matches
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return false;
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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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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 {
|
|
method: this.method,
|
|
url: this.url,
|
|
header: this.header
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Convert extnames to mime.
|
|
*
|
|
* @param {String} type
|
|
* @return {String}
|
|
* @api private
|
|
*/
|
|
|
|
function extToMime(type) {
|
|
if (~type.indexOf('/')) return type;
|
|
return mime.lookup(type);
|
|
}
|
|
|
|
/**
|
|
* Check if `exected` mime type
|
|
* matches `actual` mime type with
|
|
* wildcard support.
|
|
*
|
|
* @param {String} expected
|
|
* @param {String} actual
|
|
* @return {Boolean}
|
|
* @api private
|
|
*/
|
|
|
|
function mimeMatch(expected, actual) {
|
|
if (expected == actual) return true;
|
|
|
|
if (!~expected.indexOf('*')) return false;
|
|
|
|
actual = actual.split('/');
|
|
expected = expected.split('/');
|
|
|
|
if ('*' == expected[0] && expected[1] == actual[1]) return true;
|
|
if ('*' == expected[1] && expected[0] == actual[0]) return true;
|
|
}
|