2020-09-16 16:01:46 +08:00
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/**
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* @author yutent<yutent.io@gmail.com>
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* @date 2020/09/16 14:52:58
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*/
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2020-09-21 16:22:46 +08:00
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import fs from 'iofs'
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2020-09-20 16:27:35 +08:00
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import STATUS_TEXT from './lib/http-code.js'
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2020-09-16 16:01:46 +08:00
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export default class Response {
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constructor(req, res) {
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this.origin = { req, res }
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this.rendered = false
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}
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/**
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* [error http 错误显示]
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* @param {Number} code [http错误码]
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* @param {String} msg [错误提示信息]
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*/
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error(msg, code = 500) {
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if (this.rendered) {
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return
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}
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msg = msg || STATUS_TEXT[code]
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this.status(code)
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this.set('Content-Type', 'text/html; charset=utf-8')
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this.end(
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`<fieldset><legend>Http Status: ${code}</legend><pre>${msg}</pre></fieldset>`
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)
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}
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status(code = 404) {
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this.statusCode = code
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}
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/**
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* [append 往header插入信息]
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* @param {String} key [description]
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* @param {String} val [description]
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*/
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append(key, val) {
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if (this.rendered) {
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return
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}
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2020-09-20 16:27:35 +08:00
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var prev = this.get(key)
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var value
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if (Array.isArray(val)) {
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value = val
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} else {
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value = [val]
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}
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2020-09-16 16:01:46 +08:00
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if (prev) {
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if (Array.isArray(prev)) {
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value = prev.concat(val)
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} else {
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2020-09-20 16:27:35 +08:00
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value = [prev].concat(val)
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2020-09-16 16:01:46 +08:00
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}
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}
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return this.set(key, value)
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}
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/**
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* [redirect 页面跳转]
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* @param {String} url [要跳转的URL]
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* @param {Boolean} f [是否永久重定向]
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*/
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redirect(url, f = false) {
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if (this.rendered) {
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return
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}
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if (!/^(http[s]?|ftp):\/\//.test(url)) {
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url = '//' + url
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}
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this.set('Location', url)
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this.status(f ? 301 : 302)
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this.end('')
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}
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/**
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* [location 页面跳转(前端的方式)]
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*/
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location(url) {
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var html = `<html><head><meta http-equiv="refresh" content="0;url=${url}"></head></html>`
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if (this.rendered) {
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return
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}
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this.render(html)
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}
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// 以html格式向前端输出内容
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render(data, code) {
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if (this.rendered) {
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return
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}
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data += ''
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data = data || STATUS_TEXT[code]
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this.set('Content-Type', 'text/html')
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this.set('Content-Length', Buffer.byteLength(data))
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if (code) {
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this.status(code)
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}
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this.end(data)
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}
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// 文件下载
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2020-09-21 16:22:46 +08:00
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sendfile(target, filename) {
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2020-09-16 16:01:46 +08:00
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if (this.rendered) {
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return
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}
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2020-09-21 16:22:46 +08:00
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var data
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2020-09-16 16:01:46 +08:00
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this.set('Content-Type', 'application/force-download')
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this.set('Accept-Ranges', 'bytes')
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this.set('Content-Disposition', `attachment;filename="${filename}"`)
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2020-09-21 16:22:46 +08:00
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if (Buffer.isBuffer(target)) {
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data = target
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} else {
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if (typeof target === 'string') {
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var stat = fs.stat(target)
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if (stat.isFile()) {
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this.set('Content-Length', stat.size)
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fs.origin.createReadStream(target).pipe(this.origin.res)
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return
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}
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}
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data = Buffer.from(target + '')
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}
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this.set('Content-Length', data.length)
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2020-09-16 16:01:46 +08:00
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this.end(data)
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}
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/**
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* [send json格式输出]
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* @param {Num} code [返回码]
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* @param {Str} msg [提示信息]
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* @param {Str/Obj} data [额外数据]
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* @param {Str} callback [回调函数名]
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*/
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send(code = 200, msg = 'success', data = null, callback = null) {
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var output
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if (this.rendered) {
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return
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}
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if (typeof code !== 'number') {
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msg = code + ''
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code = 400
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} else if (typeof msg === 'object') {
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data = msg
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code = code || 200
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msg = STATUS_TEXT[code] || 'success'
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}
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output = { code, msg, data }
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output = JSON.stringify(output)
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if (callback) {
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callback = callback.replace(/[^\w\-\.]/g, '')
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output = callback + '(' + output + ')'
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}
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this.set('Content-Type', 'application/json')
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this.set('Content-Length', Buffer.byteLength(output))
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// 只设置200以上的值
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if (code && code > 200) {
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this.status(code)
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}
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this.end(output)
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}
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end(buf) {
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var code = 200
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if (this.rendered) {
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return this
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}
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if (this.statusCode) {
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code = this.statusCode
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delete this.statusCode
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}
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this.rendered = true
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this.origin.res.writeHead(code, STATUS_TEXT[code])
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this.origin.res.end(buf || '')
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}
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/**
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* [get 读取已写入的头信息]
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*/
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get(key) {
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return this.origin.res.getHeader(key)
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}
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/**
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* [set 设置头信息]
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*/
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set(key, val) {
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if (this.rendered) {
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return this
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}
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if (arguments.length === 2) {
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2020-09-20 16:27:35 +08:00
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var value = Array.isArray(val) ? val.map(String) : String(val)
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2020-09-16 16:01:46 +08:00
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2020-09-20 16:27:35 +08:00
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if (
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key.toLowerCase() === 'content-type' &&
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typeof value === 'string' &&
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value.indexOf('charset') < 0
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) {
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2020-09-16 16:01:46 +08:00
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value += '; charset=utf-8'
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}
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this.origin.res.setHeader(key, value)
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} else {
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for (let i in key) {
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this.set(i, key[i])
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}
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}
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return this
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}
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}
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