870 lines
No EOL
17 KiB
JavaScript
870 lines
No EOL
17 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 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 qs = require('qs');
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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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* Return response 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 responseHeader() {
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// TODO: wtf
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return this.res._headers || {};
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},
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/**
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* Get response status code.
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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 status() {
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return this.res.statusCode;
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},
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/**
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* Set response status code.
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*
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* @param {Number|String} val
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* @api public
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*/
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set status(val) {
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if ('string' == typeof val) {
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var n = statuses[val];
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if (!n) throw new Error(statusError(val));
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val = n;
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}
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if (204 == val || 304 == val) {
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this.res.removeHeader('Content-Type');
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this.res.removeHeader('Content-Length');
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this.res.removeHeader('Transfer-Encoding');
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}
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this.res.statusCode = val;
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},
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/**
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* Return response status 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 statusString() {
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return http.STATUS_CODES[this.status];
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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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// TODO: memoize
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return 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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return 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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return 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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* 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.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.responseHeader);
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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 parsed response 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 responseLength() {
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var len = this.responseHeader['content-length'];
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var body = this.body;
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if (null == len) {
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if (!body) return;
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if ('string' == typeof body) return Buffer.byteLength(body);
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return body.length;
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}
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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.connection.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}
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* @api public
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*/
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accepts: function(types){
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// TODO: memoize
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if (!Array.isArray(types)) types = [].slice.call(arguments);
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var normalized = types.map(extToMime);
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var n = new Negotiator(this.req);
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var accepts = n.preferredMediaTypes(normalized);
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var first = accepts[0];
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if (!first) return false;
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return types[normalized.indexOf(first)];
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},
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/**
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* Return accepted 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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* @return {Array}
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* @api public
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*/
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get acceptedEncodings() {
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var n = new Negotiator(this.req);
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return n.preferredEncodings();
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},
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/**
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* Return accepted 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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* @return {Array}
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* @api public
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*/
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get acceptedCharsets() {
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var n = new Negotiator(this.req);
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return n.preferredCharsets();
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},
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/**
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* Return accepted languages.
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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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* @return {Array}
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* @api public
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*/
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get acceptedLanguages() {
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var n = new Negotiator(this.req);
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return n.preferredLanguages();
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},
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/**
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* Return accepted media types.
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*
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* Given `Accept: application/*;q=0.2, image/jpeg;q=0.8, text/html`
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* an array sorted by quality is returned:
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*
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* ['text/html', 'image/jpeg', 'application/*']
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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 accepted() {
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var n = new Negotiator(this.req);
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return n.preferredMediaTypes();
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},
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/**
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* Check if a header has been written to the socket.
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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 headerSent() {
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return this.res.headersSent;
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},
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/**
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* Default error handling.
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*
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* @param {Error} err
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* @api private
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*/
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onerror: function(err){
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// nothing we can do here other
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// than delegate to the app-level
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// handler and log.
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if (this.headerSent) return this.app.onerror(err);
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// err.status support
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if (err.status) {
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this.status = err.status;
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this.res.end(http.STATUS_CODES[err.status]);
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return;
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}
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// respond
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this.status = 500;
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this.res.end('Internal Server Error');
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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 the give mime `type`.
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*
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* Examples:
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*
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* // With Content-Type: text/html; charset=utf-8
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* this.is('html');
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* this.is('text/html');
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* this.is('text/*');
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* // => true
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*
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* // When Content-Type is application/json
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* this.is('json');
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* this.is('application/json');
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* this.is('application/*');
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* // => true
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*
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* this.is('html');
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* // => false
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*
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* @param {String} type
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* @return {Boolean}
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* @api public
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*/
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is: function(type){
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var ct = this.type;
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if (!ct) return false;
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ct = ct.split(';')[0];
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// extension given
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if (!~type.indexOf('/')) type = mime.lookup(type);
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// type or subtype match
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if (~type.indexOf('*')) {
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type = type.split('/');
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ct = ct.split('/');
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if ('*' == type[0] && type[1] == ct[1]) return true;
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if ('*' == type[1] && type[0] == ct[0]) return true;
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return false;
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}
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// exact match
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return type == ct;
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},
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/**
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* Perform a 302 redirect to `url`.
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*
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* The string "back" is special-cased
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* to provide Referrer support, when Referrer
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* is not present `alt` or "/" is used.
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*
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* Examples:
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*
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* this.redirect('back');
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* this.redirect('back', '/index.html');
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* this.redirect('/login');
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* this.redirect('http://google.com');
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*
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* @param {String} url
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* @param {String} alt
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* @api public
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|
*/
|
|
|
|
redirect: function(url, alt){
|
|
if ('back' == url) url = this.get('Referrer') || alt || '/';
|
|
this.set('Location', url);
|
|
this.status = 302;
|
|
|
|
// html
|
|
if (this.accepts('html')) {
|
|
url = escape(url);
|
|
this.type = 'text/html; charset=utf-8';
|
|
this.body = 'Redirecting to <a href="' + url + '">' + url + '</a>.';
|
|
return;
|
|
}
|
|
|
|
// text
|
|
this.body = 'Redirecting to ' + url + '.';
|
|
},
|
|
|
|
/**
|
|
* Set Content-Disposition header to "attachment" with optional `filename`.
|
|
*
|
|
* @param {String} filename
|
|
* @api public
|
|
*/
|
|
|
|
attachment: function(filename){
|
|
if (filename) this.type = extname(filename);
|
|
this.set('Content-Disposition', filename
|
|
? 'attachment; filename="' + basename(filename) + '"'
|
|
: 'attachment');
|
|
},
|
|
|
|
/**
|
|
* Set Content-Type response header with `type` through `mime.lookup()`
|
|
* when it does not contain "/", or set the Content-Type to `type` otherwise.
|
|
*
|
|
* Examples:
|
|
*
|
|
* this.type = '.html';
|
|
* this.type = 'html';
|
|
* this.type = 'json';
|
|
* this.type = 'application/json';
|
|
* this.type = 'png';
|
|
*
|
|
* @param {String} type
|
|
* @api public
|
|
*/
|
|
|
|
set type(type){
|
|
if (!~type.indexOf('/')) type = mime.lookup(type);
|
|
this.set('Content-Type', type);
|
|
},
|
|
|
|
/**
|
|
* Return the request mime type void of
|
|
* parameters such as "charset".
|
|
*
|
|
* @return {String}
|
|
* @api public
|
|
*/
|
|
|
|
get type() {
|
|
var type = this.get('Content-Type');
|
|
if (!type) return;
|
|
return type.split(';')[0];
|
|
},
|
|
|
|
/**
|
|
* Return request header.
|
|
*
|
|
* The `Referrer` header field is special-cased,
|
|
* both `Referrer` and `Referer` are interchangeable.
|
|
*
|
|
* Examples:
|
|
*
|
|
* this.get('Content-Type');
|
|
* // => "text/plain"
|
|
*
|
|
* this.get('content-type');
|
|
* // => "text/plain"
|
|
*
|
|
* this.get('Something');
|
|
* // => undefined
|
|
*
|
|
* @param {String} name
|
|
* @return {String}
|
|
* @api public
|
|
*/
|
|
|
|
get: function(name){
|
|
var req = this.req;
|
|
switch (name = name.toLowerCase()) {
|
|
case 'referer':
|
|
case 'referrer':
|
|
return req.headers.referrer || req.headers.referer;
|
|
default:
|
|
return req.headers[name];
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Set header `field` to `val`, or pass
|
|
* an object of header fields.
|
|
*
|
|
* Examples:
|
|
*
|
|
* this.set('Foo', ['bar', 'baz']);
|
|
* this.set('Accept', 'application/json');
|
|
* this.set({ Accept: 'text/plain', 'X-API-Key': 'tobi' });
|
|
*
|
|
* @param {String|Object|Array} field
|
|
* @param {String} val
|
|
* @api public
|
|
*/
|
|
|
|
set: function(field, val){
|
|
if (2 == arguments.length) {
|
|
if (Array.isArray(val)) val = val.map(String);
|
|
else val = String(val);
|
|
this.res.setHeader(field, val);
|
|
} else {
|
|
for (var key in field) {
|
|
this.set(key, field[key]);
|
|
}
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Append `val` to header `field`.
|
|
*
|
|
* @param {String} field
|
|
* @param {String} val
|
|
* @api public
|
|
*/
|
|
|
|
append: function(field, val){
|
|
field = field.toLowerCase();
|
|
var header = this.responseHeader;
|
|
var list = header[field];
|
|
|
|
// not set
|
|
if (!list) return this.set(field, val);
|
|
|
|
// append
|
|
list = list.split(/ *, */);
|
|
if (!~list.indexOf(val)) list.push(val);
|
|
this.set(field, list.join(', '));
|
|
},
|
|
|
|
/**
|
|
* Inspect implementation.
|
|
*
|
|
* TODO: add tests
|
|
*
|
|
* @return {Object}
|
|
* @api public
|
|
*/
|
|
|
|
inspect: function(){
|
|
var o = this.toJSON();
|
|
o.body = this.body;
|
|
o.statusString = this.statusString;
|
|
return o;
|
|
},
|
|
|
|
/**
|
|
* Return JSON representation.
|
|
*
|
|
* @return {Object}
|
|
* @api public
|
|
*/
|
|
|
|
toJSON: function(){
|
|
return {
|
|
method: this.method,
|
|
status: this.status,
|
|
header: this.header,
|
|
responseHeader: this.responseHeader
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Convert extnames to mime.
|
|
*
|
|
* @param {String} type
|
|
* @return {String}
|
|
* @api private
|
|
*/
|
|
|
|
function extToMime(type) {
|
|
if (~type.indexOf('/')) return type;
|
|
return mime.lookup(type);
|
|
}
|
|
|
|
/**
|
|
* Return status error message.
|
|
*
|
|
* @param {String} val
|
|
* @return {String}
|
|
* @api private
|
|
*/
|
|
|
|
function statusError(val) {
|
|
var s = 'invalid status string "' + val + '", try:\n\n';
|
|
|
|
Object.keys(statuses).forEach(function(name){
|
|
var n = statuses[name];
|
|
s += ' - ' + n + ' "' + name + '"\n';
|
|
});
|
|
|
|
return s;
|
|
}
|
|
|
|
/**
|
|
* Escape special characters in the given string of html.
|
|
*
|
|
* @param {String} html
|
|
* @return {String}
|
|
* @api private
|
|
*/
|
|
|
|
function escape(html) {
|
|
return String(html)
|
|
.replace(/&/g, '&')
|
|
.replace(/"/g, '"')
|
|
.replace(/</g, '<')
|
|
.replace(/>/g, '>');
|
|
} |