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context.js
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'use strict';
/**
* Module dependencies.
*/
const util = require('util'); // 工具类
const createError = require('http-errors'); // 异常抛出
const httpAssert = require('http-assert'); // 断言
const delegate = require('delegates'); // 委托代理
const statuses = require('statuses'); // 输出HTTP状态类型
const Cookies = require('cookies'); // Cookies处理
const COOKIES = Symbol('context#cookies'); // Cookies标识符,用于存储字段
/**
* Context prototype.
* Context原型
*/
const proto = module.exports = {
/**
* util.inspect() implementation, which
* just returns the JSON output.
*
* util.inspect() 实现
* 只返回JSON
*
* @return {Object}
* @api public
*/
inspect() {
if (this === proto) return this;
return this.toJSON();
},
/**
* Return JSON representation.
*
* Here we explicitly invoke .toJSON() on each
* object, as iteration will otherwise fail due
* to the getters and cause utilities such as
* clone() to fail.
*
* 返回JSON描述
*
* 在每个对象上调用 .toJSON()
* 可能会由于getters使clone()失败,从而
* 导致迭代循环对象失败
*
* @return {Object}
* @api public
*/
toJSON() {
return {
request: this.request.toJSON(),
response: this.response.toJSON(),
app: this.app.toJSON(),
originalUrl: this.originalUrl,
req: '<original node req>',
res: '<original node res>',
socket: '<original node socket>'
};
},
/**
* Similar to .throw(), adds assertion.
* 类似于 .throw(), 添加断言
*
* this.assert(this.user, 401, 'Please login!');
*
* See: https://github.com/jshttp/http-assert
*
* @param {Mixed} test
* @param {Number} status
* @param {String} message
* @api public
*/
assert: httpAssert,
/**
* Throw an error with `msg` and optional `status`
* defaulting to 500. Note that these are user-level
* errors, and the message may be exposed to the client.
*
* 抛出一个错误,带有 `msg` 和 可选项 `status`
* 默认抛出500。注意这是用户级别的
* 错误,这些消息可能会暴露到客户端
*
* this.throw(403)
* this.throw('name required', 400)
* this.throw(400, 'name required')
* this.throw('something exploded')
* this.throw(new Error('invalid'), 400);
* this.throw(400, new Error('invalid'));
*
* See: https://github.com/jshttp/http-errors
*
* @param {String|Number|Error} err, msg or status
* @param {String|Number|Error} [err, msg or status]
* @param {Object} [props]
* @api public
*/
throw(...args) {
throw createError(...args);
},
/**
* Default error handling.
* 默认错误处理
*
* @param {Error} err
* @api private
*/
onerror(err) {
// don't do anything if there is no error.
// this allows you to pass `this.onerror`
// to node-style callbacks.
if (null == err) return;
if (!(err instanceof Error)) err = new Error(util.format('non-error thrown: %j', err));
let headerSent = false;
if (this.headerSent || !this.writable) {
headerSent = err.headerSent = true;
}
// delegate
this.app.emit('error', err, this);
// nothing we can do here other
// than delegate to the app-level
// handler and log.
if (headerSent) {
return;
}
const { res } = this;
// first unset all headers
/* istanbul ignore else */
if (typeof res.getHeaderNames === 'function') {
res.getHeaderNames().forEach(name => res.removeHeader(name));
} else {
res._headers = {}; // Node < 7.7
}
// then set those specified
this.set(err.headers);
// force text/plain
this.type = 'text';
// ENOENT support
if ('ENOENT' == err.code) err.status = 404;
// default to 500
if ('number' != typeof err.status || !statuses[err.status]) err.status = 500;
// respond
const code = statuses[err.status];
const msg = err.expose ? err.message : code;
this.status = err.status;
this.length = Buffer.byteLength(msg);
this.res.end(msg);
},
/**
* 获取Cookies
*/
get cookies() {
if (!this[COOKIES]) {
this[COOKIES] = new Cookies(this.req, this.res, {
keys: this.app.keys,
secure: this.request.secure
});
}
return this[COOKIES];
},
set cookies(_cookies) {
this[COOKIES] = _cookies;
}
};
/**
* Custom inspection implementation for newer Node.js versions.
* 对象自定义观察实现
*
* @return {Object}
* @api public
*/
/* istanbul ignore else */
if (util.inspect.custom) {
module.exports[util.inspect.custom] = module.exports.inspect;
}
/**
* Response delegation.
*/
delegate(proto, 'response')
.method('attachment')
.method('redirect')
.method('remove')
.method('vary')
.method('set')
.method('append')
.method('flushHeaders')
.access('status')
.access('message')
.access('body')
.access('length')
.access('type')
.access('lastModified')
.access('etag')
.getter('headerSent')
.getter('writable');
/**
* Request delegation.
*/
delegate(proto, 'request')
.method('acceptsLanguages')
.method('acceptsEncodings')
.method('acceptsCharsets')
.method('accepts')
.method('get')
.method('is')
.access('querystring')
.access('idempotent')
.access('socket')
.access('search')
.access('method')
.access('query')
.access('path')
.access('url')
.access('accept')
.getter('origin')
.getter('href')
.getter('subdomains')
.getter('protocol')
.getter('host')
.getter('hostname')
.getter('URL')
.getter('header')
.getter('headers')
.getter('secure')
.getter('stale')
.getter('fresh')
.getter('ips')
.getter('ip');