# File lib/heroku/command/ssl.rb, line 27
    def add
      raise CommandFailed, "Missing pem file." unless pem_file = args.shift
      raise CommandFailed, "Missing key file." unless key_file = args.shift
      raise CommandFailed, "Could not find pem in #{pem_file}"  unless File.exists?(pem_file)
      raise CommandFailed, "Could not find key in #{key_file}"  unless File.exists?(key_file)

      pem  = File.read(pem_file)
      key  = File.read(key_file)
      info = heroku.add_ssl(app, pem, key)
      display "Added certificate to #{info['domain']}, expiring in #{info['expires_at']}"
    end