HTTPFileServer.js

var http = require('http');
var fs   = require('fs');
var url  = require('url');

/*HTTP MIME resolver*/
var MIME = {
    js:'application/javascript',
    html:'text/html',
    css:'text/css',
    json:'application/json',
    woff:'application/font-woff',
    woff2:'application/font-woff2',
    svg:'image/svg+xml',
    ttf:'application/x-font-ttf',
    default:'',
    getMime:function(file){
        let _pathparts = file.split('.'); 
        let extension = _pathparts[_pathparts.length-1];
        if(MIME[extension.toLowerCase()]){
            return MIME[extension.toLowerCase()];
        }else{
            return MIME.default;
        }
    }
}

var StaticFileAccess = function(root){
    this.cache = {};
    this.get = function(path, callback, onerror){
        
        if(this.cache[path]){
            callback(cache[path]);
            return;
        }
        
        let mime = MIME.getMime(path);
        
        fs.readFile(root+'/'+path, 'utf8', function(err, data){
            if(err){onerror(err);return;}
            let file = {
                data:data,
                mime:mime
            };
            callback(file);
        }.bind(this));
    };
};

var HTTPFileServer = function(port, root, onStarted){
    
    var files = new StaticFileAccess(root);
    
    this.handleRequest = function(request, response){
        try{
            let path = url.parse(request.url).pathname;
            
            if(!this.acceptUrl(url.parse(request.url))) throw 'Forbidden url.';
            
            if(path=='/')path='index.html';

            console.log(request.method, path);

            files.get(path, function(file){
                console.log(request.method, path, 'RESOLVED', file.mime);
                response.setHeader('Content-Type', file.mime);
                
                response.end(file.data);
            }, function(err){
                response.statusCode = 404; response.end("Not found.");
            });
        }catch(_e){
            response.statusCode=500;response.end(_e);
        }
    }.bind(this);
    
    this.server = http.createServer(this.handleRequest.bind(this));
    
    this.server.listen(port, function(){
        if(onStarted){onStarted(this.server);}
    }.bind(this));
    
    this.acceptUrl = function(url){
        if(url.pathname.indexOf('..')>-1)return false;
        return true;
    }
}
module.exports = HTTPFileServer;