introduced ability to auto detect CNAME of custom domain

app/controllers/admin/conferences_controller.rb

@@ -4,7 +4,9 @@ module Admin
     load_resource :program, through: :conference, singleton: true, except: :index
     load_resource :user, only: [:remove_user]
 
-    def custom_domain; end
+    def custom_domain
+      redirect_to attach_custom_domain_admin_conference_path(@conference.short_title) unless @conference.custom_domain.present?
+    end
 
     def attach_custom_domain; end
 

app/models/conference.rb

@@ -92,6 +92,28 @@ class Conference < ActiveRecord::Base
     user.present? && registrations.where(user_id: user.id).count > 0
   end
 
+  ##
+  # Checks if domain correctly points to the hosted version
+  # This feature is enabled only if ENV['OSEM_HOSTNAME'] is present
+  #
+  # ====Returns
+  # * +true+ -> If the custom domain has a CNAME record for the hosted version
+  # * +false+ -> If the custom domain does not have a CNAME record for the hosted version
+  def check_custom_domain
+    require 'resolv'
+
+    unless ENV['OSEM_HOSTNAME'].nil?
+      cname_record = Resolv::DNS.new.getresources(custom_domain, Resolv::DNS::Resource::IN::CNAME)
+      if cname_record.present?
+        return ENV['OSEM_HOSTNAME'] == Resolv::DNS.new.getresources(custom_domain, Resolv::DNS::Resource::IN::CNAME).first.name.to_s
+      else
+        return false
+      end
+    end
+
+    '--feature disabled--'
+  end
+
   ##
   # Delete all EventSchedules that are not in the hours range
   # After the conference has been successfully updated

app/views/admin/conferences/attach_custom_domain.html.haml

@@ -23,13 +23,13 @@
         %h2
           Step 3:
         %strong
-          Unfortunately, we can't do this for you and you have to perform this step with the help your domain registrar! 
+          Unfortunately, we can't do this for you and you have to perform this step with the help your domain registrar!
         %p
           The last step is adding a CNAME record in your registrar’s DNS Settings. Different registrars have different ways of adding a CNAME record. The following guides would help you setup a CNAME record depending upon the registrar of your domain. If it doesn’t, you probably should get in touch with your domain registrar and ask him how to register a CNAME record in their platform.
         %ul
-          %li 
+          %li
             = link_to 'GoDaddy', 'https://in.godaddy.com/help/add-a-cname-record-19236'
-          %li 
+          %li
             = link_to 'Namecheap', 'https://www.namecheap.com/support/knowledgebase/article.aspx/9646/2237/how-can-i-set-up-a-cname-record-for-my-domain'
           %li
             = link_to 'BlueHost', 'https://my.bluehost.com/cgi/help/cname#creating_a_cname'

app/views/admin/conferences/custom_domain.html.haml

@@ -17,7 +17,14 @@
           %td
             = @conference.custom_domain
           %td
-            = ""
+            - ck_domain = @conference.check_custom_domain
+            - if ck_domain == true
+              %span.glyphicon.glyphicon-ok
+            - elsif ck_domain == false
+              %span.glyphicon.glyphicon-remove
+            - else
+              %i
+                = ck_domain
           %td
             .btn-group
               = link_to 'Edit', attach_custom_domain_admin_conference_path(@conference.short_title),
@@ -51,7 +58,7 @@
           CNAME:
         A Canonical Name record is a resource used which defines that your domain name is an alias for another domain name.
       %p
-        To add your own domain you can follow these 
+        To add your own domain you can follow these
         %i
           three
         steps:
@@ -63,9 +70,9 @@
         %li
           The last step is adding a CNAME record in your registrar’s DNS Settings. Different registrars have different ways of adding a CNAME record. The following guides would help you setup a CNAME record depending upon the registrar of your domain. If it doesn’t, you probably should get in touch with your domain registrar and ask him how to register a CNAME record in their platform.
           %ul
-            %li 
+            %li
               = link_to 'GoDaddy', 'https://in.godaddy.com/help/add-a-cname-record-19236'
-            %li 
+            %li
               = link_to 'Namecheap', 'https://www.namecheap.com/support/knowledgebase/article.aspx/9646/2237/how-can-i-set-up-a-cname-record-for-my-domain'
             %li
               = link_to 'BlueHost', 'https://my.bluehost.com/cgi/help/cname#creating_a_cname'