Add checks for username and passwords, move checks to model.

util/validation.py

@@ -1,7 +1,21 @@
 import re
+import urllib
 
 
 def validate_email(email_address):
   if re.match(r'[^@]+@[^@]+\.[^@]+', email_address):
     return True
   return False
+
+
+def validate_username(username):
+  # Minimum length of 2, maximum length of 255, no url unsafe characters
+  return (urllib.quote(username, safe='') == username and
+          len(username) > 1 and
+          len(username) < 256)
+
+def validate_password(password):
+  # No whitespace and minimum length of 8
+  if re.search(r'\s', password):
+    return False
+  return len(password) > 7