TwitterUtils.scala

import java.io.File

import scala.io.Source
import scala.collection.mutable.HashMap

object TwitterUtils {
  /** Configures the Oauth Credentials for accessing Twitter */
  def configureTwitterCredentials() {
    val file = new File("credentials.txt")
    if (!file.exists) {
      throw new Exception("Could not find configuration file " + file)
    }
    val lines = Source.fromFile(file.toString).getLines.filter(_.trim.size > 0).toSeq
    val pairs = lines.map(line => {
      val splits = line.split("=")
      if (splits.size != 2) {
        throw new Exception("Error parsing configuration file - incorrectly formatted line [" + line + "]")
      }
      (splits(0).trim(), splits(1).trim())
    })
    val map = new HashMap[String, String] ++= pairs
    val configKeys = Seq("consumerKey", "consumerSecret", "accessToken", "accessTokenSecret")
    println("Configuring Twitter OAuth")
    configKeys.foreach(key => {
        if (!map.contains(key)) {
          throw new Exception("Error setting OAuth authenticaion - value for " + key + " not found")
        }
        val fullKey = "twitter4j.oauth." + key
        System.setProperty(fullKey, map(key))
        println("\tProperty " + fullKey + " set as " + map(key)) 
    })
    println()
  }
}