Node.js寫的輕量級HTTP靜態文件的引擎
采用nodejs寫的，純javascript代碼，無任何依賴（僅使用了nodejs的標準庫）
輕量級，代碼只有15K，帶注釋
支持各種配置（內嵌到代碼最上面的部分，詳細注釋）
支持目錄訪問（自動列出全部子目錄和文件，可關閉）
支持歡迎頁（index.html，存在該文件就不會列出目錄了）
支持小文件內存緩存（LRU算法，可配置尺寸）
支持304木有修改（靜態服務器最重要的就是這個了吧）
支持gzip、deflate壓縮
支持分段下載（支持部分，可用迅雷等多線程下載工具）
提供動態解析的接口
最后由于是本人練習所用寫的，對HTTP協議的支持還是很不完善的，但是穩定性還是可以的，現在該程序運用在Minecraft多人服務器-藍色星球上，穩定地使用了3個月了吧……
/**
* Created by JetBrains WebStorm.
* User: chishaxie
* Date: 12-1-5
* Time: 下午4:59
* To change this template use File | Settings | File Templates.
*/
var conf = {
Root : 'html', //文件的根路徑
IndexEnable : true, //開啟目錄功能？
IndexFile : 'index.html', //目錄歡迎文件
DynamicExt : /^\.njs$/ig, //動態頁面后綴（需要.）
ServerName : 'httpNgin/nodeJS', //服務器名字
FileCache : { //文件（內存）緩存
MaxSingleSize : 1024*1024, //單個文件最大尺寸
MaxTotalSize : 30*1024*1024 //整個文件Cache最大尺寸
},
Expires : { //瀏覽器緩存
FileMatch : /gif|jpg|png|js|css|ico/ig, //匹配的文件格式
MaxAge : 3600*24*365 //最大緩存時間
},
Compress : { //編碼壓縮
FileMatch : /css|js|html/ig //匹配的文件格式
},
MIME : {
'css': 'text/css',
'gif': 'image/gif',
'html': 'text/html',
'ico': 'image/x-icon',
'jpg': 'image/jpeg',
'js': 'text/javascript',
'png': 'image/png',
'rar' : 'application/x-rar-compressed',
'txt': 'text/plain',
'jar': 'application/java-archive'
}
};
/* 計算長度（中文算2個長度） */
String.prototype.len = function(){
return this.replace(/[^\x00-\xff]/g,'**').length;
};
/* 填充（長度，字符串，填充到左邊？） */
String.prototype.pad = function(len,char,isLeft){
var bArr = len.toString(2).split('');
var ret = '';
var step = char;
for(var i=bArr.length-1;i>=0;i--){
if(bArr[i] == '1') ret += step;
step += step;
}
if(!isLeft) return this + ret;
else return ret + this;
};
/* 獲取Http時間（2012-12-21 19:30形式） */
Date.prototype.getHttpTime = function(){
return this.getFullYear() + '-' + (this.getMonth()+1) + '-' + this.getDate() + ' ' + this.getHours() + ':' + this.getMinutes() ;
};
/* 緩存類（maxSize 最大字節數） */
function Cache(maxSize){
this.maxSize = maxSize; //最大尺寸
this.curSize = 0; //當前尺寸
this._bufs = {}; //緩存Map
this._accessCount = 0; //訪問計數器
this._lastClearCount = 0; //上次清理的計數器
}
Cache.prototype.put = function(key,buf){
buf.access = this._accessCount++;
var obuf = this._bufs[key];
if(obuf) this.curSize -= obuf.length;
this._bufs[key] = buf;
this.curSize += buf.length;
while(this.curSize > this.maxSize){
this._clear();
}
};
Cache.prototype.get = function (key) {
var buf = this._bufs[key];
if (buf) buf.access = this._accessCount++;
return buf;
};
Cache.prototype.del = function (key) {
var buf = this._bufs[key];
if (buf) {
this.curSize -= buf.length;
delete this._bufs[key];
}
};
Cache.prototype._clear = function () {
var clearCount = (this._lastClearCount + this._accessCount) / 2;
for (var e in this._bufs) {
var buf = this._bufs[e];
if (buf.access <= clearCount) {
this.curSize -= buf.length;
delete this._bufs[e];
}
}
this._lastClearCount = clearCount;
};
/* HTTP緩存類（mtime不可更改） */
function HttpCache(mtime,obuf,gbuf,dbuf){
this.mtime = mtime; //修改時間
this.obuf = obuf; //原始數據
this.gbuf = gbuf; //gzip數據
this.dbuf = dbuf; //deflate數據
this.length = (obuf?obuf.length:0) + (dbuf?dbuf.length:0) + (gbuf?gbuf.length:0);
}
/*
HttpCache.prototype.setObuf = function(obuf){
this.length += obuf.length - (this.obuf?this.obuf.length:0);
this.obuf = obuf;
};
*/
HttpCache.prototype.setGbuf = function(gbuf){
this.length += gbuf.length - (this.gbuf?this.gbuf.length:0);
this.gbuf = gbuf;
};
HttpCache.prototype.setDbuf = function(dbuf){
this.length += dbuf.length - (this.dbuf?this.dbuf.length:0);
this.dbuf = dbuf;
};
var http = require('http'),
url = require('url'),
path = require('path'),
fs = require('fs'),
zlib = require('zlib');
/* 路徑狀態查詢（自帶文件名封裝） */
fs.statWithFN = function(dirpath,filename,callback){
fs.stat(path.join(dirpath,filename),function(err,stats){
callback(err,stats,filename);
});
};
var Com = {
fileCache : new Cache(conf.FileCache.MaxTotalSize),
ifModifiedSince : 'If-Modified-Since'.toLowerCase(),
parseRange : function(str,size){ //范圍解析（HTTP Range字段）
if(str.indexOf(",") != -1) //不支持多段請求
return;
var strs = str.split("=");
str = strs[1] || '';
var range = str.split("-"),
start = parseInt(range[0], 10),
end = parseInt(range[1], 10);
// Case: -100
if(isNaN(start)) {
start = size - end;
end = size - 1;
}
// Case: 100-
else if(isNaN(end)) {
end = size - 1;
}
// Invalid
if(isNaN(start) || isNaN(end) || start > end || end > size)
return;
return {start: start, end: end};
},
error : function(response,id,err){ //返回錯誤
response.writeHeader(id, {'Content-Type': 'text/html'});
var txt;
switch(id){
case 404:
txt = '<h3>404: Not Found</h3>';
break;
case 403:
txt = '<h3>403: Forbidden</h3>';
break;
case 416:
txt = '<h3>416: Requested Range not satisfiable</h3>';
break;
case 500:
txt = '<h3>500: Internal Server Error</h3>';
break;
}
if(err) txt += err;
response.end(txt);
},
cache : function(response,lastModified,ext){ //寫客戶端Cache
response.setHeader('Last-Modified', lastModified);
if(ext && ext.search(conf.Expires.FileMatch)!=-1){
var expires = new Date();
expires.setTime(expires.getTime() + conf.Expires.MaxAge * 1000);
response.setHeader('Expires', expires.toUTCString());
response.setHeader('Cache-Control', 'max-age=' + conf.Expires.MaxAge);
}
},
compressHandle : function(request,response,raw,ext,contentType,statusCode){ //流壓縮處理
var stream = raw;
var acceptEncoding = request.headers['accept-encoding'] || '';
var matched = ext.match(conf.Compress.match);
if (matched && acceptEncoding.match(/\bgzip\b/)) {
response.setHeader('Content-Encoding', 'gzip');
stream = raw.pipe(zlib.createGzip());
} else if (matched && acceptEncoding.match(/\bdeflate\b/)) {
response.setHeader('Content-Encoding', 'deflate');
stream = raw.pipe(zlib.createDeflate());
}
response.setHeader('Content-Type', contentType);
response.writeHead(statusCode);
stream.pipe(response);
},
flush : function(request,response,cache,ext,contentType){ //Cache輸出
var acceptEncoding = request.headers['accept-encoding'] || "";
var matched = ext.match(conf.Compress.FileMatch);
if (matched && acceptEncoding.match(/\bgzip\b/)) {
if(cache.gbuf){
response.writeHead(200, {'Content-Encoding': 'gzip','Content-Type': contentType});
response.end(cache.gbuf);
}
else{
zlib.gzip(cache.obuf,function(err,buf){
if(err) Com.error(response,500,'<h4>Error : ' + err + '</h4>');
else{
response.writeHead(200, {'Content-Encoding': 'gzip','Content-Type': contentType});
response.end(buf);
cache.setGbuf(buf);
}
});
}
} else if (matched && acceptEncoding.match(/\bdeflate\b/)) {
if(cache.dbuf){
response.writeHead(200, {'Content-Encoding': 'deflate','Content-Type': contentType});
response.end(cache.dbuf);
}
else{
zlib.deflate(cache.obuf,function(err,buf){
if(err) Com.error(response,500,'<h4>Error : ' + err + '</h4>');
else{
response.writeHead(200, {'Content-Encoding': 'deflate','Content-Type': contentType});
response.end(buf);
cache.setDbuf(buf);
}
});
}
} else {
response.writeHead(200,{'Content-Type': contentType});
response.end(cache.obuf);
}
},
pathHandle : function(request,response,realpath,httppath,dirmtime){
fs.stat(realpath,function(err,stats){
if(err){
if(dirmtime){
var dirPath = path.dirname(realpath);
fs.readdir(dirPath,function(err,files){
if(err) Com.error(response,404);
else{
var httpP = httppath.replace(/\\/g,'/');
var txt = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Index of '+httpP+'</title></head><body><h1>Index of '+httpP+'</h1><hr ><pre>';
if(httpP!='/')
txt += '<a href="'+path.dirname(httppath).replace(/\\/g,'/')+'">../</a>\n';
var fileI = 0;
var fileInfos = [];
var fsCallback = function(err,stats,filename){
if(!err) fileInfos.push([stats,filename]);
fileI++;
if(fileI == files.length){
fileInfos.sort(function(a,b){
if(a[0].isDirectory() == b[0].isDirectory())
return a[1].localeCompare(b[1]);
return b[0].isDirectory() - a[0].isDirectory();
});
for(var i=0;i<fileInfos.length;i++){
if(fileInfos[i][0].isDirectory()) fileInfos[i][1] += '/';
var sf = fileInfos[i][1];
var st = fileInfos[i][0].mtime.getHttpTime();
var ss = fileInfos[i][0].isDirectory()?'-':fileInfos[i][0].size.toString();
txt += '<a href="'+path.join(httppath,sf).replace(/\\/g,'/')+'">'+sf+'</a>'+''.pad(50-sf.len(),' ')+st+''.pad(35-st.len()-ss.length,' ')+ss+'\n'
}
txt += '</pre><hr ><h3>Powered by '+conf.ServerName+'</h3></body></html>';
var cache = new HttpCache(dirmtime.getTime(),new Buffer(txt));
Com.cache(response,dirmtime.toUTCString(),'html');
Com.flush(request,response,cache,'html','text/html');
Com.fileCache.put(dirPath+'\\',cache);
}
};
for(var i=0;i<files.length;i++)
fs.statWithFN(dirPath,files[i],fsCallback);
}
});
}
else{
Com.fileCache.del(realpath);
Com.error(response,404);
}
}
else{
var lastModified = stats.mtime.toUTCString();
//304 客戶端有Cache，且木有改動
if(request.headers[Com.ifModifiedSince] && lastModified == request.headers[Com.ifModifiedSince]){
response.writeHead(304);
response.end();
return;
}
var ext = path.extname(realpath);
ext = ext?ext.slice(1):'unknown';
ext = stats.isDirectory()?'html':ext;
var contentType = conf.MIME[ext];
var cache = Com.fileCache.get(realpath);
//服務端有Cache，且木有改動
if(cache && cache.mtime == stats.mtime.getTime()){
Com.cache(response,lastModified,ext);
Com.flush(request,response,cache,ext,contentType);
Com.fileCache.put(realpath,cache);
return;
}
if(stats.isDirectory()){
realpath = path.join(realpath,conf.IndexFile);
Com.pathHandle(request,response,realpath,httppath,conf.IndexEnable?stats.mtime:0);
}
else{
//不合法的MIME
if(!contentType){
Com.error(response,403);
return;
}
Com.cache(response,lastModified,ext);
//文件太大，服務端不Cache
if(stats.size > conf.FileCache.MaxSingleSize){
if(request.headers['range']){
var range = Com.parseRange(request.headers['range'], stats.size);
if(range){
response.setHeader('Content-Range', 'bytes ' + range.start + '-' + range.end + '/' + stats.size);
response.setHeader('Content-Length', (range.end - range.start + 1));
var raw = fs.createReadStream(realpath, {'start': range.start, 'end': range.end});
Com.compressHandle(request,response,raw,ext,contentType,206);
}
else
Com.error(response,416);
}
else{
var raw = fs.createReadStream(realpath);
Com.compressHandle(request,response,raw,ext,contentType,200);
}
}
else{
fs.readFile(realpath,function(err,data){
if(err) Com.error(response,500,'<h4>Error : ' + err + '</h4>');
else{
var buf = new HttpCache(stats.mtime.getTime(),data);
Com.flush(request,response,buf,ext,contentType);
Com.fileCache.put(realpath,buf);
}
});
}
}
}
});
}
};
/* 對外的接口 */
exports.createServer = function(port,dynamicCallBack){
if(!port) port = 80;
http.createServer(function(req,res){
if(conf.ServerName) res.setHeader('Server',conf.ServerName);
var httppath = '/';
try{
httppath = path.normalize(decodeURI(url.parse(req.url).pathname.replace(/\.\./g, '')));
}
catch(err){
httppath = path.normalize(url.parse(req.url).pathname.replace(/\.\./g, ''));
}
var realpath = path.join(conf.Root, httppath );
var ext = path.extname(realpath);
if(ext.search(conf.DynamicExt) != -1){
if(typeof dynamicCallBack === 'function')
dynamicCallBack(req,res,httppath,realpath);
else
Com.error(res,500,"<h4>Error : Can't find the dynamic page callback function!</h4>");
}
else
Com.pathHandle(req,res,realpath,httppath);
}).listen(port);
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