Added throwing and displaying all three conditions: success, duplicate and error

server.js

@@ -34,6 +34,9 @@ app.locals.theme = process.env.THEME; //Make the THEME environment variable avai
 var config = fs.readFileSync('./app_config.json', 'utf8');
 config = JSON.parse(config);
 
+// provide AWS credentials somehow, see http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/node-configuring.html
+// AWS.config.loadFromPath('../bikeshistory/scraper/credentials.aws.js');
+
 //Create DynamoDB client and pass in region.
 var db = new AWS.DynamoDB({region: config.AWS_REGION});
 //Create SNS client and pass in region.
@@ -47,32 +50,40 @@ app.post('/signup', function(req, res) {
   var nameField = req.body.name,
       emailField = req.body.email,
       previewBool = req.body.previewAccess;
-  res.send(200);
-  signup(nameField, emailField, previewBool);
+  // res.send(200);
+  signup(nameField, emailField, previewBool, res);
 });
 
 //Add signup form data to database.
-var signup = function (nameSubmitted, emailSubmitted, previewPreference) {
+var signup = function (nameSubmitted, emailSubmitted, previewPreference, res) {
   var formData = {
     TableName: config.STARTUP_SIGNUP_TABLE,
     Item: {
       email: {'S': emailSubmitted}, 
       name: {'S': nameSubmitted},
       preview: {'S': previewPreference}
-    }
+    },
+    ConditionExpression: "attribute_not_exists(email)"
   };
   db.putItem(formData, function(err, data) {
     if (err) {
       console.log('Error adding item to database: ', err);
+      if (err.code === 'ConditionalCheckFailedException') {
+        res.send(409);
+      } else {
+        res.send(500);
+      }
     } else {
       console.log('Form data added to database.');
       var snsMessage = 'New signup: %EMAIL%'; //Send SNS notification containing email from form.
       snsMessage = snsMessage.replace('%EMAIL%', formData.Item.email['S']);
       sns.publish({ TopicArn: config.NEW_SIGNUP_TOPIC, Message: snsMessage }, function(err, data) {
         if (err) {
           console.log('Error publishing SNS message: ' + err);
+          res.send(500);
         } else {
           console.log('SNS message sent.');
+          res.send(200);
         }
       });  
     }

views/index.jade

@@ -59,14 +59,20 @@ block content
         $.post( "/signup", $("#signupForm").serialize(),
                 function(data) {
                   $("#signupSuccess").show();
+                  $("#signupDuplicate").hide();
+                  $("#signupError").hide();
                 }
               )
               .error(function(xhr) {
                 switch(xhr.status) {
                   case 409:
+                    $("#signupSuccess").hide();
                     $("#signupDuplicate").show();
+                    $("#signupError").hide();
                     break;
                   default:
+                    $("#signupSuccess").hide();
+                    $("#signupDuplicate").hide();
                     $("#signupError").show();
                 }
               })