taykt

Finally, how to restrict the poll to a unique vote per mobile phone. This would be useful for community voting where a single person could skew results by voting multiple times.

The set up instructions are the same as the previous example apart from the webhook URL has changed to http://taykt-demo.appspot.com/unique?name=community

class SingleVotePerMobilePollServlet extends PollTrait{
  
    val numbers = Map[String, Set[String]]()

    override def doPost(request:HttpServletRequest , response:HttpServletResponse ) {
        response.setContentType("text/plain");
        response.setCharacterEncoding("utf-8");

        request.getParameter("name") match {
          case pollName:String =>
            val pid =  request.getParameter("pid")
            pollOptionFromString(request.getParameter("text")) match {
            case None             => response.getWriter().println("You didn't say what you wanted to vote for!")
            case Some(pollOption) =>  
            if (hasntVoted(pollName,pid)) {
              recordVote(pollName,pid)
              polls.get(pollName) match{
                case None => polls += (pollName -> Map(pollOption -> 1))
                case Some(poll) =>
                    if (poll.contains(pollOption)) {
                        val count = poll(pollOption)
                        poll.put(pollOption, count + 1)
                    } else {
                        poll.put(pollOption, 1)
                    }
            }
            response.getWriter().println(sMSResponse(pollName, pollOption))
            } else { response.getWriter().println("You can only vote once in the " + pollName + " poll.")}              
            }
          case null => response.getWriter().println("No poll name provided, contact Poll organiser")   
        }

    }
      
    private def hasntVoted( pollName:String, id:String ):Boolean  = {
        numbers.get(pollName) match {
          case None       =>  numbers.put(pollName, Set[String]());true
          case Some(poll) =>  !poll.contains(id) 
        }
    }

    private def recordVote(pollName:String , pid:String) = { numbers(pollName) += pid }
 
    override def pollOptionFromString(raw:String):Option[String] = raw match {
      case null   => None
      case option => Some(option.split(" ")(0))
    }
 
}

To view how a poll is going, point your browser at http://taykt-demo.appspot.com/poll?name=pollname, so for the example above it would be http://taykt-demo.appspot.com/unique?name=community

You can try this particular service out with the web hook URL of: http://taykt-demo.appspot.com/unique?name=community

Example call:

 $ curl http://taykt-demo.appspot.com/unique?name=community -X POST -d text="community Postman Pat" -d pid="abc123"