Initial skeleton for the framework.

build.sbt

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+import Dependencies._
+
+lazy val root = (project in file(".")).
+  settings(
+    inThisBuild(List(
+      organization := "com.example",
+      scalaVersion := "2.12.3",
+      version      := "0.1.0-SNAPSHOT")),
+    name := "LibreCaptcha",
+    libraryDependencies += scalaTest % Test,
+
+    libraryDependencies += "com.sksamuel.scrimage" %% "scrimage-core" % "2.1.8",
+
+    libraryDependencies += "com.sksamuel.scrimage" %% "scrimage-io-extra" % "2.1.8",
+
+    libraryDependencies += "com.sksamuel.scrimage" %% "scrimage-filters" % "2.1.8"
+   
+)

project/Dependencies.scala

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+import sbt._
+
+object Dependencies {
+  lazy val scalaTest = "org.scalatest" %% "scalatest" % "3.0.3"
+}

project/build.properties

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+sbt.version=1.0.4

src/main/scala/Main.scala

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+import com.sksamuel.scrimage._
+import java.io._
+
+class CaptchaLibrary {
+  var tokenAnswer = scala.collection.mutable.Map[String, String]()
+  def init = {}
+  def shutdown = {}
+  def getChallenge(): Challenge = {
+    //choose a captcha provider randomly
+    val blurCaptcha = new BlurCaptcha
+    val (challenge, answer) = blurCaptcha.getChallenge()
+    tokenAnswer += challenge.token->answer
+    challenge
+  }
+  def checkAnswer(token: String, input: String): Boolean = {
+    if (tokenAnswer(token) == input) {
+      true
+    }
+    else {
+      false
+    }
+  }
+}
+
+trait CaptchaProvider {
+  def getChallenge(): (Challenge, String)
+}
+
+class Challenge(val token: String, val image: Image)
+
+class Answer(val token: String, val input: String)
+
+class BlurCaptcha extends CaptchaProvider {
+  def getChallenge(): (Challenge, String) = {
+    val inFileName = "image2.png"
+    var image = Image.fromStream(new FileInputStream(inFileName))
+    image = image.filter(com.sksamuel.scrimage.filter.BlurFilter)
+    image.output(new File("blur.png"))
+
+    val r = scala.util.Random
+    val token = r.nextInt(1000).toString
+    val challenge = new Challenge(token, image)
+    val answer = "about"
+    (challenge, answer)
+  }
+}