Add validation when a organization user is created

app/controllers/admin/organization_users_controller.rb

@@ -82,6 +82,13 @@ class Admin::OrganizationUsersController < Admin::AdminController
     end
     raise Carto::UnprocesableEntityError.new("Soft limits validation error") if validation_failure
 
+    if Cartodb::Central.api_sync_enabled?
+      response = central_new_organization_user_validation(@user)
+      unless response['valid']
+        raise Sequel::ValidationFailed.new("Validation failed: #{response['error']}")
+      end
+    end
+
     @user.save(raise_on_failure: true)
     @user.create_in_central
     common_data_url = CartoDB::Visualization::CommonDataService.build_url(self)

app/helpers/organization_users_helper.rb

@@ -50,6 +50,10 @@ module OrganizationUsersHelper
     hardened_params.symbolize_keys
   end
 
+  def central_new_organization_user_validation(user)
+    Cartodb::Central.new.validate_new_organization_user(username: user.username, email: user.email)
+  end
+
   # This is not run at model validation flow because we might want to override this rules.
   # owner parameter allows validation before actual value setting
   def soft_limits_validation(user, params_to_update, owner = user.organization.owner)

lib/cartodb/central.rb

@@ -24,10 +24,8 @@ module Cartodb
       !api_sync_enabled?
     end
 
-    class <<self
-
+    class << self
       alias login_redirection_enabled? api_sync_enabled?
-
     end
 
     def initialize
@@ -93,6 +91,15 @@ module Cartodb
       send_request("api/organizations/#{ organization_name }/users/#{ username }", nil, :get, [200])
     end
 
+    def validate_new_organization_user(username:, email:)
+      send_request(
+        'api/organizations/users/validate_new',
+        { user: { username: username, email: email } },
+        :post,
+        [200, 400]
+      )
+    end
+
     def create_organization_user(organization_name, user_attributes)
       payload = {
         organization_name: organization_name