feat(email): WIP start implementing unsubscription page and related features

website/src/controllers/unsubscription.js

@@ -0,0 +1,33 @@
+var User = require('../models/user');
+var EmailUnsubscription = require('../models/emailUnsubscription');
+var utils = require('../utils');
+
+var api = module.exports = {};
+
+api.unsubscribe = function(req, res, next){
+  if(!req.query.code) return next(new Error('Missing unsubscription code.'));
+
+  var data = JSON.parse(utils.decrypt(req.query.code));
+
+  if(data._id){
+    User.update({_id: data._id}, {
+      $set: {}
+    }, {multi: false}, function(err, nAffected){
+      if(err) return next(err);
+      if(nAffected !== 1) return next(new Error('User not found'));
+
+      res.send('Unsubscribed!');
+    });
+  }else{
+    EmailUnsubscription.findOne({email: data.email}, function(err, res){
+      if(err) return next(err);
+      if(res) return next(new Error('Email address already unsubscribed'));
+
+      EmailUnsubscription.create({email: data.email}, function(err, res){
+        if(err) return next(err);
+        
+        res.send('Unsubscribed!');
+      })
+    });
+  }
+};