Build File Server With NodeJS

mime.js

//mime.js

var mime = {

  //查找文件後綴類型
  lookupExtension : function(ext, fallback) {
    return mime.TYPES[ext.toLowerCase()] || fallback || 'text/plain';
  },

  //文件類型
  TYPES : { ".3gp"   : "video/3gpp"
          , ".a"     : "application/octet-stream"
          , ".ai"    : "application/postscript"
          , ".aif"   : "audio/x-aiff"
          , ".aiff"  : "audio/x-aiff"
          , ".asc"   : "application/pgp-signature"
          , ".asf"   : "video/x-ms-asf"
          , ".asm"   : "text/x-asm"
          , ".asx"   : "video/x-ms-asf"
          , ".atom"  : "application/atom+xml"
          , ".au"    : "audio/basic"
          , ".avi"   : "video/x-msvideo"
          , ".bat"   : "application/x-msdownload"
          , ".bin"   : "application/octet-stream"
          , ".bmp"   : "image/bmp"
          , ".bz2"   : "application/x-bzip2"
          , ".c"     : "text/x-c"
          , ".cab"   : "application/vnd.ms-cab-compressed"
          , ".cc"    : "text/x-c"
          , ".chm"   : "application/vnd.ms-htmlhelp"
          , ".class"   : "application/octet-stream"
          , ".com"   : "application/x-msdownload"
          , ".conf"  : "text/plain"
          , ".cpp"   : "text/x-c"
          , ".crt"   : "application/x-x509-ca-cert"
          , ".css"   : "text/css"
          , ".csv"   : "text/csv"
          , ".cxx"   : "text/x-c"
          , ".deb"   : "application/x-debian-package"
          , ".der"   : "application/x-x509-ca-cert"
          , ".diff"  : "text/x-diff"
          , ".djv"   : "image/vnd.djvu"
          , ".djvu"  : "image/vnd.djvu"
          , ".dll"   : "application/x-msdownload"
          , ".dmg"   : "application/octet-stream"
          , ".doc"   : "application/msword"
          , ".dot"   : "application/msword"
          , ".dtd"   : "application/xml-dtd"
          , ".dvi"   : "application/x-dvi"
          , ".ear"   : "application/java-archive"
          , ".eml"   : "message/rfc822"
          , ".eps"   : "application/postscript"
          , ".exe"   : "application/x-msdownload"
          , ".f"     : "text/x-fortran"
          , ".f77"   : "text/x-fortran"
          , ".f90"   : "text/x-fortran"
          , ".flv"   : "video/x-flv"
          , ".for"   : "text/x-fortran"
          , ".gem"   : "application/octet-stream"
          , ".gemspec" : "text/x-script.ruby"
          , ".gif"   : "image/gif"
          , ".gz"    : "application/x-gzip"
          , ".h"     : "text/x-c"
          , ".hh"    : "text/x-c"
          , ".htm"   : "text/html"
          , ".html"  : "text/html"
          , ".ico"   : "image/vnd.microsoft.icon"
          , ".ics"   : "text/calendar"
          , ".ifb"   : "text/calendar"
          , ".iso"   : "application/octet-stream"
          , ".jar"   : "application/java-archive"
          , ".java"  : "text/x-java-source"
          , ".jnlp"  : "application/x-java-jnlp-file"
          , ".jpeg"  : "image/jpeg"
          , ".jpg"   : "image/jpeg"
          , ".js"    : "application/javascript;charset=utf-8"
          , ".json"  : "application/json"
          , ".log"   : "text/plain;charset=utf-8"
          , ".m3u"   : "audio/x-mpegurl"
          , ".m4v"   : "video/mp4"
          , ".man"   : "text/troff"
          , ".mathml"  : "application/mathml+xml"
          , ".mbox"  : "application/mbox"
          , ".mdoc"  : "text/troff"
          , ".me"    : "text/troff"
          , ".mid"   : "audio/midi"
          , ".midi"  : "audio/midi"
          , ".mime"  : "message/rfc822"
          , ".mml"   : "application/mathml+xml"
          , ".mng"   : "video/x-mng"
          , ".mov"   : "video/quicktime"
          , ".mp3"   : "audio/mpeg"
          , ".mp4"   : "video/mp4"
          , ".mp4v"  : "video/mp4"
          , ".mpeg"  : "video/mpeg"
          , ".mpg"   : "video/mpeg"
          , ".ms"    : "text/troff"
          , ".msi"   : "application/x-msdownload"
          , ".odp"   : "application/vnd.oasis.opendocument.presentation"
          , ".ods"   : "application/vnd.oasis.opendocument.spreadsheet"
          , ".odt"   : "application/vnd.oasis.opendocument.text"
          , ".ogg"   : "application/ogg"
          , ".p"     : "text/x-pascal"
          , ".pas"   : "text/x-pascal"
          , ".pbm"   : "image/x-portable-bitmap"
          , ".pdf"   : "application/pdf"
          , ".pem"   : "application/x-x509-ca-cert"
          , ".pgm"   : "image/x-portable-graymap"
          , ".pgp"   : "application/pgp-encrypted"
          , ".pkg"   : "application/octet-stream"
          , ".pl"    : "text/x-script.perl"
          , ".pm"    : "text/x-script.perl-module"
          , ".png"   : "image/png"
          , ".pnm"   : "image/x-portable-anymap"
          , ".ppm"   : "image/x-portable-pixmap"
          , ".pps"   : "application/vnd.ms-powerpoint"
          , ".ppt"   : "application/vnd.ms-powerpoint"
          , ".ps"    : "application/postscript"
          , ".psd"   : "image/vnd.adobe.photoshop"
          , ".py"    : "text/x-script.python"
          , ".qt"    : "video/quicktime"
          , ".ra"    : "audio/x-pn-realaudio"
          , ".rake"  : "text/x-script.ruby"
          , ".ram"   : "audio/x-pn-realaudio"
          , ".rar"   : "application/x-rar-compressed"
          , ".rb"    : "text/x-script.ruby"
          , ".rdf"   : "application/rdf+xml"
          , ".roff"  : "text/troff"
          , ".rpm"   : "application/x-redhat-package-manager"
          , ".rss"   : "application/rss+xml"
          , ".rtf"   : "application/rtf"
          , ".ru"    : "text/x-script.ruby"
          , ".s"     : "text/x-asm"
          , ".sgm"   : "text/sgml"
          , ".sgml"  : "text/sgml"
          , ".sh"    : "application/x-sh"
          , ".sig"   : "application/pgp-signature"
          , ".snd"   : "audio/basic"
          , ".so"    : "application/octet-stream"
          , ".svg"   : "image/svg+xml"
          , ".svgz"  : "image/svg+xml"
          , ".swf"   : "application/x-shockwave-flash"
          , ".t"     : "text/troff"
          , ".tar"   : "application/x-tar"
          , ".tbz"   : "application/x-bzip-compressed-tar"
          , ".tcl"   : "application/x-tcl"
          , ".tex"   : "application/x-tex"
          , ".texi"  : "application/x-texinfo"
          , ".texinfo" : "application/x-texinfo"
          , ".text"  : "text/plain"
          , ".tif"   : "image/tiff"
          , ".tiff"  : "image/tiff"
          , ".torrent" : "application/x-bittorrent"
          , ".tr"    : "text/troff"
          , ".txt"   : "text/plain"
          , ".vcf"   : "text/x-vcard"
          , ".vcs"   : "text/x-vcalendar"
          , ".vrml"  : "model/vrml"
          , ".war"   : "application/java-archive"
          , ".wav"   : "audio/x-wav"
          , ".wma"   : "audio/x-ms-wma"
          , ".wmv"   : "video/x-ms-wmv"
          , ".wmx"   : "video/x-ms-wmx"
          , ".wrl"   : "model/vrml"
          , ".wsdl"  : "application/wsdl+xml"
          , ".xbm"   : "image/x-xbitmap"
          , ".xhtml"   : "application/xhtml+xml"
          , ".xls"   : "application/vnd.ms-excel"
          , ".xml"   : "application/xml"
          , ".xpm"   : "image/x-xpixmap"
          , ".xsl"   : "application/xml"
          , ".xslt"  : "application/xslt+xml"
          , ".yaml"  : "text/yaml"
          , ".yml"   : "text/yaml"
          , ".zip"   : "application/zip"
          }
};

exports.mime=mime;

fileserver.js

//fileserver.js

/***
 * @author nickchung
 * @date 2015-03-04
 * 一個基於Node.js的簡單文件服務器
 */

var fs=require("fs"),
    http=require("http"),
    url=require("url"),
    path=require("path"),
    mime=require("./mime").mime,
    util=require('util');

//www根目錄
var root=__dirname+'/www',
    host="192.168.0.106",
    port="8080";
    
    
if(!fs.existsSync(root)){
    util.error(root+"文件夾不存在，請從新制定根文件夾！");
    process.exit();
}
    
//顯示文件夾下面的文件
function listDirectory(parentDirectory,req,res){
    fs.readdir(parentDirectory,function(error,files){
        var body=formatBody(parentDirectory,files);
        res.writeHead(200,{
            "Content-Type":"text/html;charset=utf-8",
            "Content-Length":Buffer.byteLength(body,'utf8'),
            "Server":"NodeJs("+process.version+")"
        });
        res.write(body,'utf8');
        res.end();
    });

}

//顯示文件內容
function showFile(file,req,res){
    fs.readFile(filename,'binary',function(err,file){
        var contentType=mime.lookupExtension(path.extname(filename));
        res.writeHead(200,{
            "Content-Type":contentType,
            "Content-Length":Buffer.byteLength(file,'binary'),
            "Server":"NodeJs("+process.version+")"
        });
        res.write(file,"binary");
        res.end();
    })
}

//在Web頁面上顯示文件列表，格式爲<ul><li></li><li></li></ul>
function formatBody(parent,files){
    var res=[],
        length=files.length;
    res.push("<!doctype>");
    res.push("<html>");
    res.push("<head>");
    res.push("<meta http-equiv='Content-Type' content='text/html;charset=utf-8'></meta>")
    res.push("<title>Node.js文件服務器</title>");
    res.push("</head>");
    res.push("<body width='100%'>");
    res.push("<ul>")
    files.forEach(function(val,index){
        var stat=fs.statSync(path.join(parent,val));
        if(stat.isDirectory(val)){
            val=path.basename(val)+"/";
        }else{
            val=path.basename(val);
        }
        res.push("<li><a href='"+val+"'>"+val+"</a></li>");
    });
    res.push("</ul>");
    res.push("<div style='position:relative;width:98%;bottom:5px;height:25px;background:gray'>");
    res.push("<div style='margin:0 auto;height:100%;line-height:25px;text-align:center'>Powered By Node.js</div>");
    res.push("</div>")
    res.push("</body>");
    return res.join("");
}

//若是文件找不到，顯示404錯誤
function write404(req,res){
    var body="文件不存在:-(";
    res.writeHead(404,{
        "Content-Type":"text/html;charset=utf-8",
        "Content-Length":Buffer.byteLength(body,'utf8'),
        "Server":"NodeJs("+process.version+")"
    });
    res.write(body);
    res.end();
}

//建立服務器
http.createServer(function(req,res){
    //將url地址的中的%20替換爲空格，否則Node.js找不到文件
    var pathname=url.parse(req.url).pathname.replace(/%20/g,' '),
        re=/(%[0-9A-Fa-f]{2}){3}/g;
    //可以正確顯示中文，將三字節的字符轉換爲utf-8編碼
    pathname=pathname.replace(re,function(word){
        var buffer=new Buffer(3),
            array=word.split('%');
        array.splice(0,1);
        array.forEach(function(val,index){
            buffer[index]=parseInt('0x'+val,16);
        });
        return buffer.toString('utf8');
    });
    if(pathname=='/'){
        listDirectory(root,req,res);
    }else{
        filename=path.join(root,pathname);
        fs.exists(filename,function(exists){
            if(!exists){
                util.error('找不到文件'+filename);
                write404(req,res);
            }else{
                fs.stat(filename,function(err,stat){
                    if(stat.isFile()){
                        showFile(filename,req,res);
                    }else if(stat.isDirectory()){
                        listDirectory(filename,req,res);
                    }
                });
            }
        });
    }
    
    
}).listen(port,host);
util.log("file server run at http://"+host+":"+port);