Add LabelCaptcha plugin

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

src/main/scala/lc/LabelCaptcha.scala

@@ -0,0 +1,80 @@
+package lc
+
+import java.io.File
+import java.io.ByteArrayOutputStream
+import javax.imageio.ImageIO
+import scala.collection.mutable.Map
+import java.nio.file.{Files,Path,StandardCopyOption}
+import java.awt.image.BufferedImage
+import java.awt.{Graphics2D,Color}
+
+class LabelCaptcha extends ChallengeProvider {
+  var knownFiles = new File("known").list.toList
+  var unknownFiles = new File("unknown").list.toList
+  var tokenImagePair = Map[String, ImagePair]()
+  var unknownAnswers = Map[String, Map[String, Int]]()
+  var total = Map[String, Int]()
+  for(file <- unknownFiles) {
+      unknownAnswers += file -> Map[String, Int]()
+      total += file -> 0
+  }
+  def getId = "LabelCaptcha"
+  def returnChallenge(): Challenge = synchronized {
+    val r = scala.util.Random.nextInt(knownFiles.length)
+    val s = scala.util.Random.nextInt(unknownFiles.length)
+    val knownImageFile = knownFiles(r)
+    val unknownImageFile = unknownFiles(s)
+    val ip = new ImagePair(knownImageFile, unknownImageFile)
+    val token = scala.util.Random.nextInt(10000).toString
+    tokenImagePair += (token -> ip)
+    var knownImage = ImageIO.read(new File("known/"+knownImageFile))
+    var unknownImage = ImageIO.read(new File("unknown/"+unknownImageFile))
+    val width = knownImage.getWidth()+unknownImage.getWidth()
+    val height = List(knownImage.getHeight(), unknownImage.getHeight()).max
+    val imageType = knownImage.getType()
+    val finalImage = new BufferedImage(width, height, imageType)
+    val g = finalImage.createGraphics()
+    g.setColor(Color.WHITE)
+    g.fillRect(0, 0, finalImage.getWidth(), finalImage.getHeight())
+    g.drawImage(knownImage, null, 0, 0)
+    g.drawImage(unknownImage, null, knownImage.getWidth(), 0)
+    g.dispose()
+    val baos = new ByteArrayOutputStream()
+    ImageIO.write(finalImage,"png",baos)
+    new Challenge(baos.toByteArray(), "image/png", token)
+  }
+  def checkAnswer(token: String, input: String): Boolean = synchronized {
+    val imagePair = tokenImagePair(token)
+    val expectedAnswer = imagePair.known.split('.')(0)
+    val userAnswer = input.split(' ')
+    println(userAnswer)
+    if(userAnswer(0)==expectedAnswer) {
+      println("Entered if userAnswer(0)")
+      val unknownFile = tokenImagePair(token).unknown
+      if((unknownAnswers(unknownFile)).contains(userAnswer(1))) {
+        println("Enterd 2 if")
+        unknownAnswers(unknownFile)(userAnswer(1)) += 1
+        total(unknownFile) += 1
+      } else {
+        println("Enter else")
+        unknownAnswers(unknownFile)+=(userAnswer(1)) -> 1
+        total(unknownFile) += 1
+      }
+      if(total(unknownFile)>=3) {
+        if((unknownAnswers(unknownFile)(userAnswer(1))/total(unknownFile))>=0.9) {
+          unknownAnswers -= unknownFile
+          Files.move(new File("unknown/"+unknownFile).toPath, new File("known/"+userAnswer(1)+".png").toPath, StandardCopyOption.REPLACE_EXISTING)
+          knownFiles = new File("known").list.toList
+          unknownFiles = new File("unknown").list.toList
+        }
+      }
+      println("ret true")
+      true
+    } else {
+      println("ret false")
+      false
+    }
+  }
+}
+
+class ImagePair(val known: String, val unknown: String)

src/main/scala/lc/Main.scala

@@ -30,7 +30,8 @@ class Captcha {
   val filters = Map("FilterChallenge" -> new FilterChallenge,
                     "FontFunCaptcha" -> new FontFunCaptcha,
                     "GifCaptcha" -> new GifCaptcha,
-                    "ShadowTextCaptcha" -> new ShadowTextCaptcha)
+                    "ShadowTextCaptcha" -> new ShadowTextCaptcha,
+                    "LabelCaptcha" -> new LabelCaptcha)
 
   def getProvider(): String = {
     val random = new scala.util.Random
@@ -58,7 +59,6 @@ class Captcha {
     val blob = new ByteArrayInputStream(challenge.content)
     val token = scala.util.Random.nextInt(10000).toString
     val id = Id(token)
-    print("Successfull")
     insertPstmt.setString(1, token)
     insertPstmt.setString(2, provider.getId)
     insertPstmt.setString(3, challenge.secret)