自定义express中间件
const http = require('http')
class LikeExpress {
constructor() {
this.middleList = []
this.routes = {
all: [],
get: [],
post: []
}
}
// 处理参数
register(path) {
const info = {}
const slice = Array.prototype.slice
if (typeof path === 'string') {
info.path = path
info.stack = slice.call(arguments, 1)
} else {
info.path = '/'
info.stack = slice.call(arguments, 0)
}
return info
}
use() {
const info = this.register.apply(this, arguments)
this.routes.all.push(info)
}
get() {
const info = this.register.apply(this, arguments)
this.routes.get.push(info)
}
post() {
const info = this.register.apply(this, arguments)
this.routes.post.push(info)
}
match(url, method) {
let stack = []
if (url === 'favicon.ico') {
return stack
}
let curRoutes = []
curRoutes = curRoutes.concat(this.routes.all).concat(this.routes[method])
curRoutes.forEach(route => {
if (url.indexOf(route.path) === 0) {
stack = stack.concat(route.stack)
}
})
return stack
}
handle(list, req, res) {
const next = () => {
const middware = list.shift()
if (middware) {
middware(req, res, next)
}
}
next()
}
callback() {
return (req, res) => {
res.json = data => {
res.setHeader('Content-Type', 'application/json')
res.end(JSON.stringify(data))
}
const url = req.url
const method = req.method.toLowerCase()
const resultList = this.match(url, method)
this.handle(resultList, req, res)
}
}
listen(...args) {
const server = http.createServer(this.callback())
server.listen(...args)
}
}
module.exports = LikeExpress
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