Node.js静态文件服务器改进版

首先还是先感谢github，感谢github上提供此段源码的作者。跟昨晚的来比今天的静态文件服务器有点点复杂些，可以学到很多新的东西。
仔细会发现这次的代码多了一个fs.stat函数和ReadStream对象的pipe函数，stat这个函数是用来获取文件信息。第一个参数是传入文件路径，第二个则是回调函数，回调函数的第二个参数stats的属性为文件的基本信息。pipe函数用于将这个可读流和destination目标可写流连接起来，传入这个流中的数据将会写入到destination流中。通过在必要时暂停和恢复流，来源流和目的流得以保持同步。

该静态文件服务器的改进点在于使用了Last-Modified和If-Modified-Since报文头，可以不必要给浏览器返回它已经存在的文件。顺便可以根据浏览器请求资源的压缩方式返回给资源进行gzip或者deflate压缩。

var PORT = 8000;
var http = require("http");
var url = require("url");
var fs = require("fs");
var path = require("path");
var mime = require("./mime").types;
var config = require("./config");
var zlib = require("zlib");

var server = http.createServer(function(request, response) {
    response.setHeader("Server", "Node/V5");
    var pathname = url.parse(request.url).pathname;
    console.log("url = " + pathname);
    if (pathname.slice(-1) === "/") {
        pathname = pathname + config.Welcome.file;
    }
    var realPath = __dirname + "/" + path.join("assets", path.normalize(pathname.replace(/\.\./g, "")));
    console.log("realPath = " + realPath);
    var pathHandle = function (realPath) {
        fs.stat(realPath, function (err, stats) {
            if (err) {
                response.writeHead(404, "Not Found", {‘Content-Type‘: ‘text/plain‘});
                response.write("stats = " + stats);
                response.write("This request URL " + pathname + " was not found on this server.");
                response.end();
            } else {
                if (stats.isDirectory()) {
                    realPath = path.join(realPath, "/", config.Welcome.file);
                    pathHandle(realPath);
                } else {
                    var ext = path.extname(realPath);
                    ext = ext ? ext.slice(1) : ‘unknown‘;
                    var contentType = mime[ext] || "text/plain";
                    response.setHeader("Content-Type", contentType);
                    //获得文件的修改时间
                    var lastModified = stats.mtime.toUTCString();
                    var ifModifiedSince = "If-Modified-Since".toLowerCase();
                    //设置Last-Modified
                    //服务器给浏览器返回文件最后一次修改时间Last-Modified
                    response.setHeader("Last-Modified", lastModified);

                    if (ext.match(config.Expires.fileMatch)) {
                        var expires = new Date();
                        expires.setTime(expires.getTime() + config.Expires.maxAge * 1000);
                        response.setHeader("Expires", expires.toUTCString());
                        response.setHeader("Cache-Control", "max-age=" + config.Expires.maxAge);
                    }
                    //服务器接收浏览器发送过来的If-Modified-Since报文头
                    //日期相同表示该资源没有变化则返回304
                    //告诉浏览器该资源你已经有了,不需要再请求了
                    if (request.headers[ifModifiedSince] && lastModified == request.headers[ifModifiedSince]) {
                        response.writeHead(304, "Not Modified");
                        response.end();
                    } else {
                        var raw = fs.createReadStream(realPath);
                        var acceptEncoding = request.headers[‘accept-encoding‘] || "";
                        var matched = ext.match(config.Compress.match);
                        if (matched && acceptEncoding.match(/\bgzip\b/)) {
                            response.writeHead(200, "Ok", {‘Content-Encoding‘: ‘gzip‘});
                            raw.pipe(zlib.createGzip()).pipe(response);
                        } else if (matched && acceptEncoding.match(/\bdeflate\b/)) {
                            response.writeHead(200, "Ok", {‘Content-Encoding‘: ‘deflate‘});
                            raw.pipe(zlib.createDeflate()).pipe(response);
                        } else {
                            response.writeHead(200, "Ok");
                            raw.pipe(response);
                        }
                    }
                }
            }
        });
    };

    pathHandle(realPath);
});

server.listen(PORT);
console.log("Server runing at port: " + PORT + ".");

Expires字段声明了一个网页或URL地址不再被浏览器缓存的时间，一旦超过了这个时间，浏览器都应该联系原始服务器。这里设置失效时间为1年。

exports.Expires = {
    fileMatch: /^(gif|png|jpg|js|css)$/ig,
    maxAge: 60*60*24*365
};
exports.Compress = {
    match: /css|js|html/ig
};
exports.Welcome = {
    file: "index.html"
};

枚举各种资源的类型，可根据扩展名设置Content-Type。

exports.types =  {
  "css": "text/css",
  "gif": "image/gif",
  "html": "text/html",
  "ico": "image/x-icon",
  "jpeg": "image/jpeg",
  "jpg": "image/jpeg",
  "js": "text/javascript",
  "json": "application/json",
  "pdf": "application/pdf",
  "png": "image/png",
  "svg": "image/svg+xml",
  "swf": "application/x-shockwave-flash",
  "tiff": "image/tiff",
  "txt": "text/plain",
  "wav": "audio/x-wav",
  "wma": "audio/x-ms-wma",
  "wmv": "video/x-ms-wmv",
  "xml": "text/xml"
};