added a debug captcha

Signed-off-by: hrj <harshad.rj@gmail.com>

src/main/scala/lc/captchas/DebugCaptcha.scala

@@ -0,0 +1,64 @@
+package lc.captchas
+
+import javax.imageio.ImageIO
+import java.awt.Color
+import java.awt.Font
+import java.awt.font.TextLayout
+import java.awt.image.BufferedImage
+import java.io.ByteArrayOutputStream
+import java.util.Map
+import java.util.List
+
+import lc.misc.HelperFunctions
+import lc.captchas.interfaces.Challenge
+import lc.captchas.interfaces.ChallengeProvider
+
+/** This captcha is only for debuggin purposes. It creates very simple captchas that are delibertely easy to solve with OCR engines */
+class DebugCaptcha extends ChallengeProvider {
+
+  def getId(): String = {
+    "DebugCaptcha"
+  }
+
+  def configure(config: String): Unit = {
+    // TODO: Add custom config
+  }
+
+  def supportedParameters(): Map[String, List[String]] = {
+    Map.of(
+      "supportedLevels", List.of("debug"),
+      "supportedMedia", List.of("image/png"),
+      "supportedInputType", List.of("text")
+    )
+  }
+
+  def checkAnswer(secret: String, answer: String): Boolean = {
+    answer.toLowerCase().equals(secret)
+  }
+
+  private def simpleText(text: String): Array[Byte] = {
+    val img = new BufferedImage(350, 100, BufferedImage.TYPE_INT_RGB)
+    val font = new Font("Arial", Font.ROMAN_BASELINE, 48)
+    val graphics2D = img.createGraphics()
+    val textLayout = new TextLayout(text, font, graphics2D.getFontRenderContext())
+    HelperFunctions.setRenderingHints(graphics2D)
+    graphics2D.setPaint(Color.WHITE)
+    graphics2D.fillRect(0, 0, 350, 100)
+    graphics2D.setPaint(Color.BLACK)
+    textLayout.draw(graphics2D, 15, 50)
+    graphics2D.dispose()
+    val baos = new ByteArrayOutputStream()
+    try {
+      ImageIO.write(img, "png", baos)
+    } catch {
+      case e: Exception =>
+        e.printStackTrace()
+    }
+    baos.toByteArray()
+  }
+
+  def returnChallenge(): Challenge = {
+    val secret = HelperFunctions.randomString(6)
+    new Challenge(simpleText(secret), "image/png", secret.toLowerCase())
+  }
+}

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

@@ -11,7 +11,8 @@ object CaptchaProviders {
     //"FontFunCaptcha" -> new FontFunCaptcha,
     "GifCaptcha" -> new GifCaptcha,
     "ShadowTextCaptcha" -> new ShadowTextCaptcha,
-    "RainDropsCaptcha" -> new RainDropsCP
+    "RainDropsCaptcha" -> new RainDropsCP,
+    "DebugCaptcha" -> new DebugCaptcha,
     //"LabelCaptcha" -> new LabelCaptcha
   )