node.jsの基本モジュールで、動的なウェブサービスと、静的なウェブコンテンツを配信するウェブサーバを100行でつくる

server.js

// very tiny node webserver framework
// based on https://developer.mozilla.org/ja/docs/Learn/Server-side/Node_server_without_framework

// ESModuleで統一 ただ、package.jsonに、{"type":"module"} を設定する必要があります。拡張子(.js)を付けるとダメ？・・・微妙な仕様ですね>node.js
import http from "http";
import fs from "fs";
import path from "path";

var mimeTypes = {
    '.html': 'text/html',
    '.js': 'text/javascript',
    '.css': 'text/css',
    '.json': 'application/json',
    '.png': 'image/png',
    '.jpg': 'image/jpg',
    '.gif': 'image/gif',
    '.wav': 'audio/wav',
    '.mp4': 'video/mp4',
    '.woff': 'application/font-woff',
    '.ttf': 'application/font-ttf',
    '.eot': 'application/vnd.ms-fontobject',
    '.otf': 'application/font-otf',
    '.svg': 'application/image/svg+xml'
};
    
http.createServer(function (request, response) {
	
	var rurl = new URL(request.url,"http://localhost");

    var filePath = '.' + rurl.pathname;
    if (filePath.endsWith("/")) {
        filePath = filePath + 'index.html';
    }

    var extname = String(path.extname(filePath)).toLowerCase();

//    console.log('request ', rurl, " filePath:",filePath," extn:",extname," mimeTypes:",mimeTypes,"  tp:",mimeTypes[extname]);
    var contentType = mimeTypes[extname] || 'application/octet-stream';
    console.log('request ', request.url, " filePath:",filePath, " contentType:",contentType);
	
	if ( services[rurl.pathname] ){
		respDynamic(services[rurl.pathname], response, contentType, rurl);
	} else {
		respStatic(filePath,response, contentType);
	}

}).listen(8080);
console.log('Server running at http://127.0.0.1:8080/');

function respStatic(filePath, response, contentType){
    fs.readFile(filePath, function(error, content) {
        if (error) {
            if(error.code == 'ENOENT') {
                fs.readFile('./404.html', function(error, content) {
                    response.writeHead(200, { 'Content-Type': mimeTypes[".html"] });
                    response.end(content, 'utf-8');
                });
            }
            else {
                response.writeHead(500);
                response.end('Sorry, check with the site admin for error: '+error.code+' ..\n');
                response.end();
            }
        }
        else {
            response.writeHead(200, { 'Content-Type': contentType });
            response.end(content, 'utf-8');
        }
    });
}

function respDynamic(func, response, contentType, rurl){
	func(response, contentType, rurl);
}

// 動的サービスをこのオブジェクトに登録する
var services ={
	"/getTime.json": getTimeFunc,
	// path : function
};

// 動的サービスの例
function getTimeFunc(resp, contentType, rurl){
	var ansObj = {};
	ansObj.time = new Date().getTime();
	ansObj.search = rurl.search;
	resp.writeHead(200, {'Content-Type': contentType});
	resp.write(JSON.stringify(ansObj));
	resp.end();
}

function setDynamicService(path,svfunc){
	if ( !services[path] && path.startsWith("/")){
		services[path]=svfunc;
	}
}

export default setDynamicService;

test1.js

import setDynamicService from "./server.js";
console.log("Hello");
function testjsonout(resp, contentType, rurl){
	console.log("called testjsonout");
	resp.writeHead(200, {'Content-Type': contentType});
	var ans = {};
	ans.message="hello";
	resp.write(JSON.stringify(ans));
	resp.end();
}
setDynamicService("/test.json",testjsonout);