SkypeChat2Twitter.scala

/*
Copyright (c) 2008 ymnk, JCraft,Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the distribution.

   3. The names of the authors may not be used to endorse or promote products
      derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
 INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/**
 * This program will work as the gateway between the Skype Chat and the Twitter.
 * Skype4Java[1] is required to be compiled.
 * [1] https://developer.skype.com/wiki/Java_API
 */
import java.net.{Authenticator, PasswordAuthentication}
import java.net.{URL, URLEncoder, HttpURLConnection}
import com.skype.{Skype, Chat, ChatMessage, ChatMessageAdapter}
import scala.xml.XML
import java.text.SimpleDateFormat
import java.util.Locale
import scala.actors.Actor
import scala.actors.Actor.loop
import scala.concurrent.ops.spawn

object SkypeChat2Twitter {

  Skype.setDeamon(false)

  def main(arg:Array[String]){
    val (username, passwd) = (arg(0), arg(1))  // Twitter id and password.
    val chatId = arg(2)                        // chatid 

    setAutenticator(username, passwd)

    val Array(chat) = Skype.getAllChats.filter(_.getId.toString==chatId)

    var lastSkypeWriteTime:Long = -1
    val interval:Long = 3*1000

    Skype.addChatMessageListener(
      new ChatMessageAdapter{
        override def chatMessageReceived(m:ChatMessage)=chatMessage(m)
        override def chatMessageSent(m:ChatMessage)={
          if(System.currentTimeMillis - lastSkypeWriteTime > interval){
            chatMessage(m)
          }
        }
        private def chatMessage(m:ChatMessage){
          val c=m.getChat
          if(chat==c){
            val sender = m.getSender
            val senderId = m.getSenderId
            val senderDisplayName = m.getSenderDisplayName
            m.getType.toString match {
              case "SAID" => {
                val content = m.getContent
                writeToTwitter(senderDisplayName+": "+content)
              }
              case "ADDEDMEMBERS" => {
                writeToTwitter(senderDisplayName+" joined this chat.")
              }
              case "LEFT" => {
                writeToTwitter(senderDisplayName+" left this chat.")
              }
              case _ =>
            }
          }
        }
      }
    )

    def writeToSkypeChat(message: String){
      lastSkypeWriteTime=System.currentTimeMillis
      chat.send(message)
    }

    new FriendsTimeline(username,
                        new {
                          def apply(t:String):Unit=writeToSkypeChat(t)
                        }).start
  }

  private def writeToTwitter(text:String){
    def chop(text:String):String={
      text match {
        case e if e.length>140 => chop(text.substring(0, text.length-1))
        case e => URLEncoder.encode(e, "UTF-8")
      }
    }
    val url = "http://twitter.com/statuses/update.xml?source=SkypeChat2Twitter&status="+chop(text)
    val urlConn = new URL(url).openConnection.asInstanceOf[HttpURLConnection]
    urlConn.setRequestMethod("POST")
    urlConn.connect()
    urlConn.getResponseCode
  }

  class FriendsTimeline(username:String,
                        sender:{def apply(t:String):Unit}) extends Actor{
    sealed abstract class MESSAGE
    case object GETTIMELINE extends MESSAGE

    val url = "http://twitter.com/statuses/replies.xml"

    val df = new SimpleDateFormat("EEE MMM dd HH:mm:ss +0000 yyyy", Locale.US)

    var lastTime:Long = -1
    val interval = 60 * 1000

    def act {
      this ! GETTIMELINE
      loop {
        react {
          case GETTIMELINE => {
            try{ lastTime = timeline(lastTime) }
            catch{case e:java.io.IOException => }
            ping(interval, GETTIMELINE)
          }
        }
      }
    }

    private def timeline(_lastTime:Long)={
      var lastTime=_lastTime
      val urlConn = new URL(url).openConnection.asInstanceOf[HttpURLConnection]
      urlConn.connect();
      urlConn.getResponseCode
      for (s <- XML.load(urlConn.getInputStream) \ "status" reverse ;
           created_at = s \ "created_at" text ;
           time = df.parse(created_at).getTime if(time>lastTime)) {
           lastTime=time
           var (text, user_name, screen_name) =
              (s \ "text" text,
               s \ "user" \ "name" text,
               s \ "user" \ "screen_name" text)
           if(username!=screen_name &&
             text.startsWith("@"+username)){
             if(_lastTime != -1){  // At first time, we will skip it.
               println(created_at+" ["+user_name+"] "+
                       text.substring(("@"+username).length).trim)
               sender(user_name+": "+
                      text.substring(("@"+username).length).trim)
             }
           }
      }
      lastTime
    }

    private def ping(sleep:Long, m:MESSAGE) {
      spawn { Thread.sleep(sleep); this ! m }
    }
  }

  private def setAutenticator(u:String, p:String){
    Authenticator.setDefault(
      new Authenticator {
        override def getPasswordAuthentication = {
          new PasswordAuthentication(u, p.toCharArray);
        }
      }
    )
  }
}

object ListChats {
  def main(arg:Array[String]){
    Skype.getAllChats.foreach { c =>
      import c._
      println(getId+" | "+getWindowTitle)
    }
  }
}