app.js

var express = require('express');
var app = express();
var path = require('path');
var bodyParser = require('body-parser');
var mongoose = require('mongoose');
var Slack = require('slack-node');

var config = require('./config');
var base58 = require('./base58.js');


// grab the url model
var Url = require('./models/url');

mongoose.connect(config.db);

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

app.use(express.static(path.join(__dirname, 'public')));

app.get('/', function(req, res){
  res.sendFile(path.join(__dirname, 'views/index.html'));
});

app.post('/api/shorten', function(req, res){
  var longUrl = req.body.url;
  var shortUrl = '';

  // check if url already exists in database
  Url.findOne({long_url: longUrl}, function (err, doc){
    if (doc){
      shortUrl = config.webhost + base58.encode(doc._id);

      // the document exists, so we return it without creating a new entry
      res.send({'shortUrl': shortUrl});
    } else {
      // since it doesn't exist, let's go ahead and create it:
      var newUrl = Url({
        long_url: longUrl
      });

      // save the new link
      newUrl.save(function(err) {
        if (err){
          console.log(err);
        }

        shortUrl = config.webhost + base58.encode(newUrl._id);

        res.send({'shortUrl': shortUrl});
      });
    }

  });

});

app.post('/contact', function(req,res){ 
  webhookUri = "https://hooks.slack.com/services/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";
   
  message = {
   "attachments":[
      {
         "fallback":"Message from "+req.body.name,
         "pretext":"Message from: "+req.body.name+" "+req.body.email,
         "color":"#00D000",
         "fields":[
            {
               "value":req.body.comment,
               "short":false
            }
         ]
      }
   ]
  };

  slack = new Slack();
  slack.setWebhook(webhookUri);
     
  slack.webhook(message, function(err, response) {
    console.log(response);
  });

  res.sendFile(path.join(__dirname, 'views/thanks.html'));
});

app.get('/:encoded_id', function(req, res){

  var base58Id = req.params.encoded_id;

  var id = base58.decode(base58Id);

  // check if url already exists in database
  Url.findOne({_id: id}, function (err, doc){
    if (doc) {
      var urls = doc.long_url.split(",");
      idx = Math.floor(Math.random() * urls.length);
      var url = urls[idx];
      console.log(req.params.encoded_id + " redirects to " + url + " (" + (idx + 1) + "/" + urls.length + ")");

      res.writeHead(302, {
        'Location': url
      });
      res.end();

/*      res.redirect(doc.long_url); */
    } else {
      res.redirect(config.webhost);
    }
  });

});

var server = app.listen(config.port, function(){
  console.log('Server listening on port ' + config.port);
});