Enable more than one host for configuration

Author: cscollett

app/app.rb

@@ -42,7 +42,7 @@ class PidApp < Sinatra::Base
     username: DATABASE_CONFIG['db_username'],
     password: DATABASE_CONFIG['db_password']
   }
-  
+
   TEST_MODE = false
 
   # If we're in test mode switch to SQLite and a temp Redis secret
@@ -66,8 +66,9 @@ class PidApp < Sinatra::Base
   end
 
   configure :development, :production do
+    PERMITTED_HOSTNAMES = [APP_CONFIG['app_host']] + (APP_CONFIG['alt_app_hosts'] || "").split(',').map(&:strip)
     enable :logging
-    set :host_authorization, { permitted_hosts: [APP_CONFIG['app_host']] }
+    set :host_authorization, { permitted_hosts: PERMITTED_HOSTNAMES }
   end
 
   set :session_secret, SECURITY_CONFIG['session_secret']

app/config/app.yml.example

@@ -5,6 +5,7 @@ application_name: 'PID Service'
 # The server and port where the main PID application will be hosted (comment out the port if you do not need to specify)
 app_host: <%= ENV['APP_HOST'] %>
 app_port: <%= ENV['APP_PORT'] %>
+alt_app_hosts: <%= ENV['ALT_APP_HOSTS'] %> 
 
 # The url that the system should direct users to when an inactive PID is requested
 dead_pid_url: <%= ENV['DEAD_PID_URL'] %>