xsheetjs/demos/server/micro.js

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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
var fs = require('fs');
var URL = require('url');
var child_process = require('child_process');
var micro = require('micro'), formidable = require('formidable');
var logit = require('./_logit'), cors = require('./_cors');
var json2csv = require('json2csv');
var data = "a,b,c\n1,2,3".split("\n").map(function(x) { return x.split(","); });
var xlsx = '../../bin/xlsx.njs';
function get_data(req, res, type) {
var file = "_tmp." + type;
/* prepare CSV */
var csv = json2csv({data:data, hasCSVColumnTitle:false});
/* write it to a temp file */
fs.writeFile('tmp.csv', csv, function(err1) {
/* call xlsx to read the csv and write to another temp file */
child_process.exec(xlsx+' tmp.csv -o '+ file, function(err, stdout, stderr){
cors(req, res);
/* read the new file and send it to the client */
micro.send(res, 200, fs.readFileSync(file));
});
});
}
function get_file(req, res, file) {
var csv = json2csv({data:data, hasCSVColumnTitle:false});
fs.writeFile('tmp.csv', csv, function(err1) {
/* write to specified file */
child_process.exec(xlsx+' tmp.csv -o '+file, function(err, stdout, stderr) {
cors(req, res);
micro.send(res, 200, "wrote to " + file + "\n");
});
});
}
function post_data(req, res) {
var form = new formidable.IncomingForm();
form.on('file', function(field, file) {
/* file.path is the location of the file in the system */
child_process.exec(xlsx+' --arrays ' + file.path, post_cb(req, res));
});
form.parse(req);
}
function post_file(req, res, file) {
child_process.exec(xlsx+' --arrays ' + file, post_cb(req, res));
}
function post_cb(req, res) {
return function(err, stdout, stderr) {
cors(req, res);
/* xlsx --arrays writes JSON to stdout, so parse and assign to data var */
data = JSON.parse(stdout);
console.log(data);
return micro.send(res, 200, "ok\n");
};
}
function get(req, res) {
var url = URL.parse(req.url, true);
if(url.pathname.length > 1) micro.send(res, 404, "File not found");
else if(url.query.t) get_data(req, res, url.query.t);
else if(url.query.f) get_file(req, res, url.query.f);
else micro.send(res, 403, "Forbidden\n");
}
function post(req, res) {
var url = URL.parse(req.url, true);
if(url.pathname.length > 1) micro.send(res, 404, "File not found");
else if(url.query.f) post_file(req, res, url.query.f);
else post_data(req, res);
}
module.exports = function(req, res) {
logit(req, res);
switch(req.method) {
case 'GET': return get(req, res);
case 'POST': return post(req, res);
}
return micro.send(res, 501, "Unsupported method " + req.method + "\n");
};