secret santa generator and post to slack, disclaimer: rushed together, did what we needed...

slack-secret-santa.js

var Slack = require('node-slack'),
    webhookUri = '{WEBHOOKURI}';

var slack = new Slack(webhookUri);

var users = [
  'sydlawrence',
  'adverplanner',
  'sophtly',
  'robman',
  'nrocy'
];
var recipients = [];

var price = Math.floor(Math.random() * 100) / 100;
while (price < 7) {
  price += 1;
}
var sendMessage = function(user, recipient) {
  slack.send({
    channel: '@' + user,
    username: 'WMAS Secret Santa',
    icon_url: 'http://www.sellmymobile.com/blog/wp-content/uploads/2014/12/0325.png',
    text: 'Ho ho ho!',
    attachments: [
      {
      color: 'good',
      fields: [
        {
          title: 'You need to get a present for ' + recipient,
          value: 'The present should be around £' + price
        }
      ]
    }]
  }, function(err, response) {
    console.log(err);
    console.log(response);
  });
}

function shuffle(array) {
    var tmp, current, top = array.length;

    if(top) while(--top) {
      current = Math.floor(Math.random() * (top + 1));
      tmp = array[current];
      array[current] = array[top];
      array[top] = tmp;
    }

    return array;
}

while (true) {
  var valid = true;
  var x = [];
  for (var i in users) {
    x.push(users[i]);
  }
  recipients = shuffle(x);
  for (var i in recipients) {
    if (recipients[i] === users[i]) {
      valid = false;
      break;
    }
  }

  if (valid) {
    break;
  }
}


for (var i in users) {
 sendMessage(users[i], recipients[i]);
}