file-cache-api.js

/*
The MIT License (MIT)

Copyright (c) 2014 Evandro Luiz Hauenstein

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

var restify = require('restify'),
    server = restify.createServer({ name: 'file-cache-api' });
var fs = require('fs');
var mime = require('mime');
var glob = require('glob');
var util = require('util');

fs.mkdir('./files/', function(){});

var EXPIRES = 60*60*24*3;    // 3 days

var Log = function() {
    var date = new Date();
    process.stdout.write(date.toISOString() + ' ' + util.format.apply(this, arguments) + '\n');
}

var process_req = function (req, res, next) {
    Log('REQUEST: ' + req.method + ', ID: ' + req.params.id);
    glob('./files/' + req.params.id + '-*', {}, function(err, filelist) {
        if (err) throw err;
        if (filelist[0]) {
            // just in case we got more than one result, pick the latest one (based on expire time)
            filelist.sort();
            var idx = filelist.length-1;
            // parsing (get id, expire and filename)
            var match = /.*\/(.*)-([0-9]+)-(.*)/.exec(filelist[idx]);
            if (match) {
                var id = match[1];
                var expire = match[2];
                var filename = match[3];
                var mimetype = mime.lookup(filelist[idx]);
                if (expire > (Math.floor(Date.now() / 1000))) {
                    res.setHeader('Content-disposition', 'attachment; filename=' + filename);
                    res.setHeader('Content-type', mimetype);
                    var filestream = fs.createReadStream(filelist[idx]);
                    filestream.pipe(res);
                    return;
                }
                Log('the requested file is expired', filelist[idx]);
                res.send(404);
                return;
            }
        }
        Log('the requested file is not available');
        res.send(404);
    });
}
server.get('/get/:id', process_req);
server.head('/get/:id', process_req);

server.post('set/:id',  restify.bodyParser({uploadDir: './files'}), function (req, res, next) {
    Log('REQUEST: ' + req.method + ', ID: ' + req.params.id + ', FILE: ' + req.files.data.name);
    if( req.files && req.files.data && req.files.data.path ) {
        fs.rename(req.files.data.path, './files/' + req.params.id + '-' + (Math.floor(Date.now() / 1000) + EXPIRES) + '-' + req.files.data.name, function (err) {
            if (err) throw err;
        });
    }
    res.end();
})

setInterval(function() {
    glob('./files/*', {}, function(err, filelist) {
        if (err) throw err;
        if (filelist[0]) {
            filelist.sort();
            for(idx in filelist) {
                var match = /.*\/(.*)-([0-9]+)-(.*)/.exec(filelist[idx]);
                if (match) {
                    var id = match[1];
                    var expire = match[2];
                    var filename = match[3];
                    if (expire <= (Math.floor(Date.now() / 1000))) {
                        Log('EXPIRED', filelist[idx]);
                        fs.unlink(filelist[idx]);
                    }
                }
            }
        }
    });
}, 300000) // 5 minutes

server.listen(3000, '0.0.0.0', function () {
  Log('%s listening at %s', server.name, server.url)
})

Node.js + restify upload/download API example.
Demonstration of how to upload files to restify service, files will saved using the following format: "fileid-timestamp-filename" (timestamps are used for the expiration mechanism, files are deleted past 3 days)
To upload files use http://127.0.0.1:3000/set/[fileid], to download use: http://127.0.0.1:3000/get/[fileid]

For instance, uploading files (e.g. test.bin) using curl:
curl -v -include --form data=@test.bin 'http://127.0.0.1:3000/set/12345' --noproxy 127.0.0.1

downloading:
wget --content-disposition 'http://127.0.0.1:3000/get/12345' --no-proxy