Untitled

var http = require('http'),
sys = require('sys');
url = require('url')
spawn = require('child_process').spawn;
fs = require('fs');

var handleRequests = function(response, data){
    //Create a req
    var crypto = require("crypto");
    var fs = require('fs');
    var f = fs.openSync('/dev/random', 'r', mode=0666);
    var rand = fs.readSync(f, 10,0, encoding='base64');
    var key = rand[0] ;
    var hmacdata = '1234567890' ;

    var hmac = crypto.createHmac("sha1", key);
    var hash2 = hmac.update(hmacdata);
    var filename = hmac.digest(encoding="hex");
    //Create a file by this name and stream to it...
    var latex    = spawn('latex',['-jobname='+filename]);
    //TODO:Write to a system log
    latex.stdout.on('data', function (data) {
        sys.print('***Latex stdout: ' + data);
    });
    //On closing the stdout?? I dont quite understand
    latex.stdout.on('close', function(data_temp){
        console.log('***CLOSED LATEX STREAM...');

        dvi2svg = spawn('dvisvgm',['-s', filename])
        response.writeHead(200, {'Content-Type': 'text/html'});
        response.write('<HTML><HEAD></HEAD>');

        dvi2svg.stdout.on('data',
            function(data) {
                console.log('***DVISVGM stdout detected.'+data );
                //Stream the o/p
                response.write(data);

        })

        dvi2svg.stdout.on('end',function(data){
                console.log('***DVISVG Data...'+data)
                response.end('</HTML>');
                spawn('rm',[filename+'.dvi',filename+'.aux',filename+'.log']).stderr.on('data', function(data){
                    console.log('Deleted temp files...'+data)
                });
        });
    })

    latex.stderr.on('data', function (data) {
        sys.print('***Latex stdout: ' + data);
    });
    //TODO: Write to Sockets and read from there...Write Latex O/P to a socket using -ipc option.
    //Create a socket and read and write from it
    //mkfifo is for making named pipes
    latex.stdin.write('\\documentclass{article} \\usepackage{amsmath} \\usepackage{amssymb} \\usepackage{amsfonts} \\thispagestyle{empty} \\begin{document} \\[ '+data+' \\] \\end{document}')
    //TO DO: USE DVI
    latex.stdin.end();
    //TODO: Read from socket

}
server = http.createServer(function(req, response){
    // your normal server code


    //Attempt to return a latex SVG image...
       var qs = require('querystring');
       var querystring = url.parse(req.url).query;
       var queryobject = qs.parse(querystring);
       console.log(querystring);
       if('latex' in queryobject){
           var data = queryobject['latex'];
           handleRequests(response, data);

       }else{
           //Serve the normal HTML index file...
           response.writeHead(200, {'Content-Type': 'text/html'});
           fs.readFile('index.html', encoding='utf8', function (err, data) {
              if (err) throw err;
              response.write(data);
              response.end();
            });


       }


});
server.listen(80);
process.setuid('sid')