174 lines
3.6 KiB
JavaScript
174 lines
3.6 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 delegate = require('delegates');
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var http = require('http');
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/**
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* Context prototype.
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*/
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var proto = module.exports = {
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/**
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* Return JSON representation.
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*
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* Here we explicitly invoke .toJSON() on each
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* object, as iteration will otherwise fail due
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* to the getters and cause utilities such as
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* clone() to fail.
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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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request: this.request.toJSON(),
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response: this.response.toJSON()
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}
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},
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/**
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* Throw an error with `msg` and optional `status`
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* defaulting to 500. Note that these are user-level
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* errors, and the message may be exposed to the client.
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*
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* this.throw(403)
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* this.throw('name required', 400)
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* this.throw(400, 'name required')
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* this.throw('something exploded')
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* this.throw(new Error('invalid'), 400);
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* this.throw(400, new Error('invalid'));
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*
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* @param {String|Number|Error} err, msg or status
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* @param {String|Number|Error} err, msg or status
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* @api public
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*/
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throw: function(msg, status){
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if ('number' == typeof msg) {
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var tmp = msg;
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msg = status || http.STATUS_CODES[tmp];
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status = tmp;
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}
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var err = msg instanceof Error ? msg : new Error(msg);
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err.status = status || err.status || 500;
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err.expose = err.status < 500;
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throw err;
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},
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/**
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* Alias for .throw() for backwards compatibility.
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* Do not use - will be removed in the future.
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*
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* @param {String|Number} msg
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* @param {Number} status
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* @api private
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*/
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error: function(msg, status){
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console.warn('ctx.error is deprecated, use ctx.throw');
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this.throw(msg, status);
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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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// don't do anything if there is no error.
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// this allows you to pass `this.onerror`
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// to node-style callbacks.
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if (!err) return;
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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 || !this.writable) {
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err.headerSent = true;
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this.app.emit('error', err, this);
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return;
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}
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// delegate
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this.app.emit('error', err, this);
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// unset all headers
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this.res._headers = {};
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// force text/plain
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this.type = 'text';
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// ENOENT support
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if ('ENOENT' == err.code) err.status = 404;
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// default to 500
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err.status = err.status || 500;
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// respond
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var code = http.STATUS_CODES[err.status];
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var msg = err.expose ? err.message : code;
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this.status = err.status;
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this.length = Buffer.byteLength(msg);
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this.res.end(msg);
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}
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};
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/**
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* Response delegation.
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*/
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delegate(proto, 'response')
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.method('attachment')
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.method('redirect')
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.method('append')
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.method('remove')
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.method('vary')
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.method('set')
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.access('status')
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.access('body')
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.access('length')
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.access('type')
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.getter('headerSent')
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.getter('writable')
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.setter('lastModified')
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.setter('etag');
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/**
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* Request delegation.
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*/
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delegate(proto, 'request')
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.method('acceptsLanguages')
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.method('acceptsEncodings')
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.method('acceptsCharsets')
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.method('accepts')
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.method('get')
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.method('is')
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.access('querystring')
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.access('idempotent')
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.access('socket')
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.access('search')
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.access('method')
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.access('query')
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.access('path')
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.access('host')
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.access('url')
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.getter('subdomains')
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.getter('protocol')
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.getter('hostname')
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.getter('header')
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.getter('secure')
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.getter('stale')
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.getter('fresh')
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.getter('ips')
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.getter('ip');
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