From 60f21d2927b5173ecbd9cccc8bbe91018029c471 Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam.soltys@pwgsc-tpsgc.gc.ca>
Date: Wed, 16 Jan 2013 00:05:18 -0800
Subject: Test for username existence

---
 app.coffee             |  1 +
 public/js/index.coffee | 21 +++++++++++++++++++++
 routes/users.coffee    |  6 ++++++
 views/main/about.html  |  6 ++----
 views/main/index.html  |  2 +-
 5 files changed, 31 insertions(+), 5 deletions(-)

diff --git a/app.coffee b/app.coffee
index 5a7a6ce0..9bcd8169 100644
--- a/app.coffee
+++ b/app.coffee
@@ -59,6 +59,7 @@ app.get('/login', sessions.new)
 app.post('/login', sessions.create)
 app.get('/logout', sessions.destroy)
 
+app.get('/:user/exists', users.exists)
 app.get('/:user.json', authorize, users.json)
 app.get('/:user', authorize, users.show)
 
diff --git a/public/js/index.coffee b/public/js/index.coffee
index ea4f9ac3..940a5e2a 100644
--- a/public/js/index.coffee
+++ b/public/js/index.coffee
@@ -1,8 +1,29 @@
 #= require jquery-1.8.2.min.js
 
+g = exports ? this
+
 $(->
   fetchExchangeRate('ask') 
   fetchExchangeRate('bid') 
+
+  $('#username').blur(->
+    $.get(
+      "/#{$(this).val()}/exists", 
+      username: $(this).val(),
+      (data) ->
+        if data is "true"
+          $('#username').prev().css('color', 'red').html('Username (taken)')
+          g.preventSubmit = true
+        else
+          $('#username').prev().css('color', 'black').html('Username')
+          g.preventSubmit = false
+    )
+  )
+
+  $('#signup').submit(->
+    return false if g.preventSubmit
+    return true
+  )
 )
 
 fetchExchangeRate = (type) ->
diff --git a/routes/users.coffee b/routes/users.coffee
index d312dcf5..b39fc8e9 100644
--- a/routes/users.coffee
+++ b/routes/users.coffee
@@ -2,6 +2,12 @@ db = require("redis").createClient()
 bcrypt = require('bcrypt')
 
 module.exports = (sessions) ->
+  exists: (req, res) ->
+    db.hgetall(req.params.user, (err, obj) ->
+      if obj? then res.write('true') else res.write('false')
+      res.end()
+    )
+  
   json: (req, res) ->
     db.hgetall(req.params.user, (err, obj) ->
       delete obj['password']
diff --git a/views/main/about.html b/views/main/about.html
index 966c90e2..aa1c653e 100644
--- a/views/main/about.html
+++ b/views/main/about.html
@@ -13,13 +13,11 @@
     <p>
     New bitcoin addresses start with a zero balance.  Transactions between addresses are 
     recorded in a file that gets published on 
-    the Internet.  The file keeps track of every transaction that's ever taken place on the bitcoin network and is used to determine the current balance of every address.
+    the Internet.  The file keeps track of every transaction that's ever taken place and therefore knows the balance of every address.
     </p>
     
     <p>
-    Roughly 150 new bitcoins are 
-    generated every hour and distributed proportionally to the addresses of people that
-    contribute computing power to the network. The 
+    New bitcoins are generated every 10 minutes and distributed to people who volunteer computing power to run the bitcoin network. The 
     <a href="http://bitcoin.org">software to participate</a> is free and open source so anyone can run it on their computer to earn bitcoins.
     </p>
 
diff --git a/views/main/index.html b/views/main/index.html
index ab40422e..3920c568 100644
--- a/views/main/index.html
+++ b/views/main/index.html
@@ -31,7 +31,7 @@
 
       <div class="row-fluid">
         <div class="span12 well">
-          <form action="/users" method="post" style="float: right; padding-left: 15px;">
+          <form id="signup" action="/users" method="post" style="float: right; padding-left: 15px;">
             <h2>Sign Up</h2>
 
             <label for="username">Username:</label>
-- 
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