Hide ldap group links if ldap is not enabled

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/controllers/application_controller.rb

@@ -239,4 +239,10 @@ class ApplicationController < ActionController::Base
       redirect_to profile_path, notice: 'Please complete your profile with email address' and return
     end
   end
+
+  def require_ldap_enabled
+    unless Gitlab.config.ldap.enabled
+      render_404 and return
+    end
+  end
 end

app/controllers/groups/ldap_group_links_controller.rb

 class Groups::LdapGroupLinksController < ApplicationController
   before_action :group
+  before_action :require_ldap_enabled
   before_action :authorize_admin_group!
 
   layout 'group'

app/views/groups/_settings_nav.html.haml

@@ -7,10 +7,11 @@
     = link_to projects_group_path(@group) do
       %i.fa.fa-folder
       Projects
-  = nav_link(controller: :ldap_group_links) do
-    = link_to group_ldap_group_links_path(@group) do
-      %i.icon-exchange
-      LDAP Groups
+  - if ldap_enabled?
+    = nav_link(controller: :ldap_group_links) do
+      = link_to group_ldap_group_links_path(@group) do
+        %i.fa.fa-exchange
+        LDAP Groups
   = nav_link(controller: :audit_events) do
     = link_to group_audit_events_path(@group) do
       %i.fa.fa-file-text-o