使用nodejs实现apache的部分功能

首先来一个配置文件config.js，这个文件导出一个包含配置信息的对象

module.exports = {
    port: 3000,                 //服务器端口号
    documentRoot: 'E:/webdev',  //根目录
    directoryBrowse: true,  //是否开启目录浏览功能
    directoryIndex: [    //目录默认访问页
        'index.html',
        'index.htm',
        'deflaut.html'
    ],
    charset: 'utf-8',
    mineType: {
        image: {
            gif: 'image/gif',
            jpeg: 'image/jpeg',
            jpg: 'image/jpeg',
            png: 'image/png',
        },
        text: {
            css: 'text/css',
            htm: 'text/html',
            html: 'text/html',
            js: 'application/x-javascript',
            json: 'application/json',
            pdf: 'application/pdf',
        },
        other: 'text/plain'
    }
}

然后是服务器代码app.js，这个文件开启一个http服务，实现了apache的目录浏览和部分类型文件的查看功能

const http = require('http')
const fs = require('fs')
const path = require('path')
const config = require('./config')
const server = http.createServer()
const documentRoot = config.documentRoot

server.on('request', function (req, res) {
    let url = req.url
    console.log(url)
    let tmp = documentRoot + url
    let exitst = fs.existsSync(tmp)
    if(exitst){
        let stats1 = fs.statSync(tmp)

        if(stats1.isDirectory()){
            for(let key in config.directoryIndex) {
                let file = tmp + '/' + config.directoryIndex[key]
                console.log(file);
                if(fs.existsSync(file)){
                    res.writeHead(301, {'Location': 'http://127.0.0.1:' + config.port + url + config.directoryIndex[key]})
                    res.end()
                    return
                }
            }
            if(!config.directoryBrowse){
                //没有开放目录浏览权限
                res.end('403 forbidden!!')
                return
            }
            //遍历目录
            fs.readFile('./template.html', function (err, data) {
                if (err) {
                    return res.end('404 Not Found!!!')
                }
                // 1. 如何得到 documentRoot 目录列表中的文件名和目录名
                //    fs.readdir
                // 2. 如何将得到的文件名和目录名替换到 template.html 中
                //    2.1 在 template.html 中需要替换的位置预留一个特殊的标记（就像以前使用模板引擎的标记一样）
                //    2.2 根据 files 生成需要的 HTML 内容
                let prevDisplay = 'block'
                if(url == '/'){
                    prevDisplay = 'none'
                }
                fs.readdir(tmp, async function (err, files) {
                    if (err) {
                        return res.end('Can not find dir.')
                    }
                    // 2.1 生成需要替换的内容
                    let content = ''
                    files.forEach(function (item) {
                    let type = ''
                    let separate = ''
                    let stats2 = fs.statSync(tmp + item)
                    if(stats2.isDirectory()){
                        type = 'dir'
                        separate = '/'
                    }else{
                        type = 'file'
                    }
                    content += `
                        <tr>
                            <td data-value="apple/"><a class="icon ${type}" href="http://127.0.0.1:${config.port + url + item + separate}">${item + separate}</a></td>
                        </tr>
                    `
                })
                // 替换
                data = data.toString()
                data = data.replace('^_^', content)
                data = data.replace('{{display}}', `style="display:${prevDisplay}"`)
                data = data.replace(/{{parentPath}}/g, url.substring(0, url.substr(0,url.length - 1).lastIndexOf('/') + 1))
                data = data.replace(/{{path}}/g, url.substring(1))
                // 发送解析替换过后的响应数据
                res.end(data)
                })
            })
        }else{
            //渲染文件
            fs.readFile(tmp, function(err, data){
                if(err){
                    res.end()
                }
                let ext = path.extname(tmp).substring(1)
                if(ext in config.mineType.text){
                    res.setHeader('Content-Type', `${config.mineType.text[ext]}; charset=${config.charset}`)
                }else if(ext in config.mineType.image){
                    res.setHeader('Content-Type', `${config.mineType.text[ext]}`)
                }else{
                    res.setHeader('Content-Type', `${config.mineType.other}; charset=${config.charset}`)
                }
                res.end(data)
            })
        }
    }else{
        res.end()
    }
})
server.listen(config.port, function () {
  console.log(`running in port:${config.port}`)
})

最后是目录浏览的模板文件template.html

<html>
<head>
    <meta charset="utf-8">
    <style>
        h1 {
            border-bottom: 1px solid #c0c0c0;
            margin-bottom: 10px;
            padding-bottom: 10px;
            white-space: nowrap;
        }
        table {
            border-collapse: collapse;
        }
        a.icon {
            -webkit-padding-start: 1.5em;
            text-decoration: none;
        }
        a.icon:hover {
            text-decoration: underline;
        }
        a.file {
            background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAAABnRSTlMAAAAAAABupgeRAAABHUlEQVR42o2RMW7DIBiF3498iHRJD5JKHurL+CRVBp+i2T16tTynF2gO0KSb5ZrBBl4HHDBuK/WXACH4eO9/CAAAbdvijzLGNE1TVZXfZuHg6XCAQESAZXbOKaXO57eiKG6ft9PrKQIkCQqFoIiQFBGlFIB5nvM8t9aOX2Nd18oDzjnPgCDpn/BH4zh2XZdlWVmWiUK4IgCBoFMUz9eP6zRN75cLgEQhcmTQIbl72O0f9865qLAAsURAAgKBJKEtgLXWvyjLuFsThCSstb8rBCaAQhDYWgIZ7myM+TUBjDHrHlZcbMYYk34cN0YSLcgS+wL0fe9TXDMbY33fR2AYBvyQ8L0Gk8MwREBrTfKe4TpTzwhArXWi8HI84h/1DfwI5mhxJamFAAAAAElFTkSuQmCC ") left top no-repeat;
        }
        a.dir {
            background: url("data:image/png;base64,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 ") left top no-repeat;
        }
        a.up {
            background: url("data:image/png;base64,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 ") left top no-repeat;
        }
        #parentDirLinkBox {
            margin-bottom: 10px;
            padding-bottom: 10px;
        }
    </style>
    <title id="title">Index Of{{path}}</title>
</head>
<body>
<h1 id="header">Index Of/{{path}}</h1>
<div id="parentDirLinkBox" {{display}}>
    <a id="parentDirLink" class="icon up" href="{{parentPath}}">
        <span id="parentDirText">[上级目录]</span>
    </a>
</div>
<table>
    <tbody id="tbody">^_^</tbody>
</table>
</body>
</html>

end^_^