- Better error messages for sign up

- Show a throbber while working on sign up
- Have the front page redirect to the repositories view when logged in

endpoints/api.py

@@ -13,7 +13,7 @@ from auth.permissions import (ReadRepositoryPermission,
                               ModifyRepositoryPermission,
                               AdministerRepositoryPermission)
 from endpoints import registry
-
+import re
 
 logger = logging.getLogger(__name__)
 
@@ -55,6 +55,14 @@ def get_logged_in_user():
 @app.route('/api/user/', methods=['POST'])
 def create_user_api():
   user_data = request.get_json()
+  existing_user = model.get_user(user_data['username'])
+  if existing_user:
+    error_resp = jsonify({
+         'message': 'The username already exists'
+    })
+    error_resp.status_code = 400
+    return error_resp
+
   try:
     new_user = model.create_user(user_data['username'], user_data['password'],
                                  user_data['email'])
@@ -62,8 +70,13 @@ def create_user_api():
     send_confirmation_email(new_user.username, new_user.email, code.code)
     return make_response('Created', 201)
   except model.DataModelException as ex:
+    message = ex.message
+    m = re.search('column ([a-zA-Z]+) is not unique', message)
+    if m and m.group(1):
+      message = m.group(1) + ' already exists'
+
     error_resp = jsonify({
-      'message': ex.message,
+      'message': message,
     })
     error_resp.status_code = 400
     return error_resp