Add config support

Signed-off-by: Rahul Rudragoudar <rr83019@gmail.com>

src/main/scala/lc/Main.scala

@@ -3,13 +3,18 @@ package lc
 import lc.core.{Captcha, CaptchaProviders}
 import lc.server.Server
 import lc.background.BackgroundTask
+import lc.core.Config
 
 object LCFramework {
   def main(args: scala.Array[String]): Unit = {
     val captcha = new Captcha()
-    val server = new Server(8888, captcha)
-    val backgroudTask = new BackgroundTask(captcha, 10)
-    backgroudTask.beginThread(2)
+    val server = new Server(port = Config.getPort, captcha = captcha)
+    val backgroundTask = new BackgroundTask(
+      captcha = captcha,
+      throttle = Config.getThrottle,
+      timeLimit = Config.getCaptchaExpiryTimeLimit
+    )
+    backgroundTask.beginThread(delay = Config.getThreadDelay)
     server.start()
   }
 }

src/main/scala/lc/core/captchaProviders.scala

@@ -3,6 +3,8 @@ package lc.core
 import lc.captchas._
 import lc.captchas.interfaces.ChallengeProvider
 import lc.captchas.interfaces.Challenge
+import org.json4s.{DefaultFormats, JObject, JField, JArray, JString}
+import org.json4s.jackson.Serialization.write
 
 object CaptchaProviders {
   private val providers = Map(
@@ -21,10 +23,12 @@ object CaptchaProviders {
     }
   }
 
-  private val seed = System.currentTimeMillis.toString.substring(2, 6).toInt
+  implicit val formats: DefaultFormats.type = DefaultFormats
+  private val seed = Config.getSeed
   private val random = new scala.util.Random(seed)
+  private val config = Config.getCaptchaConfig
 
-  private def getNextRandomInt(max: Int) =
+  private def getNextRandomInt(max: Int): Int =
     random.synchronized {
       random.nextInt(max)
     }
@@ -33,9 +37,26 @@ object CaptchaProviders {
     return providers(id)
   }
 
-  def getProvider(): ChallengeProvider = {
-    val keys = providers.keys
-    val providerIndex = keys.toVector(getNextRandomInt(keys.size))
-    providers(providerIndex)
+  private def filterProviderByParam(param: Parameters): List[(String, String)] = {
+    for {
+      JObject(child) <- config
+      JField("name", JString(name)) <- child
+      JField("supportedLevels", JArray(supportedLevels)) <- child
+      JField("supportedMedia", JArray(supportedMedia)) <- child
+      JField("supportedinputType", JArray(supportedinputType)) <- child
+      JField("config", config) <- child
+      if supportedLevels.contains(JString(param.level))
+      if supportedMedia.contains(JString(param.media))
+      if supportedinputType.contains(JString(param.input_type))
+    } yield (name, write(config))
+  }
+
+  def getProvider(param: Parameters): ChallengeProvider = {
+    val providerConfig = filterProviderByParam(param)
+    val randomIndex = getNextRandomInt(providerConfig.length)
+    val providerIndex = providerConfig(randomIndex)._1
+    val selectedProvider = providers(providerIndex)
+    selectedProvider.configure(providerConfig(randomIndex)._2)
+    selectedProvider
   }
 }

src/main/scala/lc/core/config.scala

@@ -0,0 +1,80 @@
+package lc.core
+
+import scala.io.Source.fromFile
+import org.json4s.{DefaultFormats, JValue, JObject, JField}
+import org.json4s.jackson.JsonMethods.parse
+
+object Config {
+
+  implicit val formats: DefaultFormats.type = DefaultFormats
+
+  private val configFile = fromFile("config.json")
+  private val configString =
+    try configFile.mkString
+    finally configFile.close
+  private val configJson = parse(configString)
+
+  private val port = (configJson \ "port").extract[Int]
+  private val throttle = (configJson \ "throttle").extract[Int]
+  private val seed = (configJson \ "randomSeed").extract[Int]
+  private val captchaExpiryTimeLimit = (configJson \ "captchaExpiryTimeLimit").extract[Int]
+  private val threadDelay = (configJson \ "threadDelay").extract[Int]
+  private val capthcaConfig = (configJson \ "captchas")
+
+  private val supportedLevels = getAllValues(configJson, "supportedLevels")
+  private val supportedMedia = getAllValues(configJson, "supportedMedia")
+  private val supportedinputType = getAllValues(configJson, "supportedinputType")
+
+  private def getAllValues(config: JValue, param: String): Set[String] = {
+    val configValues = (config \\ param)
+    val result = for {
+      JObject(child) <- configValues
+      JField(param) <- child
+    } yield (param)
+
+    var valueSet = Set[String]()
+    for (valueList <- result) {
+      for (value <- valueList._2.children) {
+        valueSet += value.values.toString
+      }
+    }
+    valueSet
+  }
+
+  def getPort(): Int = {
+    port
+  }
+
+  def getThrottle(): Int = {
+    throttle
+  }
+
+  def getSeed(): Int = {
+    seed
+  }
+
+  def getCaptchaExpiryTimeLimit(): Int = {
+    captchaExpiryTimeLimit
+  }
+
+  def getThreadDelay(): Int = {
+    threadDelay
+  }
+
+  def getCaptchaConfig(): JValue = {
+    capthcaConfig
+  }
+
+  def getSupportedLevels(): Set[String] = {
+    supportedLevels
+  }
+
+  def getSupportedMedia(): Set[String] = {
+    supportedMedia
+  }
+
+  def getSupportedinputType(): Set[String] = {
+    supportedinputType
+  }
+
+}