Add supportedParams method

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

src/main/java/lc/captchas/FontFunCaptcha.java

@@ -6,6 +6,8 @@ import java.awt.image.BufferedImage;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FilenameFilter;
+import java.util.HashMap;
+import java.util.List;
 import lc.captchas.interfaces.Challenge;
 import lc.captchas.interfaces.ChallengeProvider;
 import lc.misc.HelperFunctions;
@@ -16,6 +18,15 @@ public class FontFunCaptcha implements ChallengeProvider {
     return "FontFunCaptcha";
   }
 
+  public HashMap<String, List<String>> supportedParameters() {
+    HashMap<String, List<String>> supportedParams = new HashMap<String, List<String>>();
+    supportedParams.put("supportedLevels", List.of("medium"));
+    supportedParams.put("supportedMedia", List.of("image/png"));
+    supportedParams.put("supportedInputType", List.of("text"));
+
+    return supportedParams;
+  }
+
   public void configure(String config) {
     // TODO: Add custom config
   }

src/main/java/lc/captchas/GifCaptcha.java

@@ -6,6 +6,9 @@ import java.awt.RenderingHints;
 import java.awt.Color;
 import java.awt.image.BufferedImage;
 import java.io.IOException;
+import java.util.HashMap;
+import java.util.List;
+
 import javax.imageio.stream.ImageOutputStream;
 import javax.imageio.stream.MemoryCacheImageOutputStream;
 import java.io.ByteArrayOutputStream;
@@ -52,6 +55,15 @@ public class GifCaptcha implements ChallengeProvider {
     // TODO: Add custom config
   }
 
+  public HashMap<String, List<String>> supportedParameters() {
+    HashMap<String, List<String>> supportedParams = new HashMap<String, List<String>>();
+    supportedParams.put("supportedLevels", List.of("hard"));
+    supportedParams.put("supportedMedia", List.of("image/gif"));
+    supportedParams.put("supportedInputType", List.of("text"));
+
+    return supportedParams;
+  }
+
   public Challenge returnChallenge() {
     String secret = HelperFunctions.randomString(6);
     return new Challenge(gifCaptcha(secret), "image/gif", secret.toLowerCase());

src/main/java/lc/captchas/ShadowTextCaptcha.java

@@ -10,6 +10,9 @@ import java.awt.image.BufferedImage;
 import java.awt.image.ConvolveOp;
 import java.awt.image.Kernel;
 import java.io.ByteArrayOutputStream;
+import java.util.HashMap;
+import java.util.List;
+
 import lc.misc.HelperFunctions;
 import lc.captchas.interfaces.Challenge;
 import lc.captchas.interfaces.ChallengeProvider;
@@ -24,6 +27,15 @@ public class ShadowTextCaptcha implements ChallengeProvider {
     // TODO: Add custom config
   }
 
+  public HashMap<String, List<String>> supportedParameters() {
+    HashMap<String, List<String>> supportedParams = new HashMap<String, List<String>>();
+    supportedParams.put("supportedLevels", List.of("easy"));
+    supportedParams.put("supportedMedia", List.of("image/png"));
+    supportedParams.put("supportedInputType", List.of("text"));
+
+    return supportedParams;
+  }
+
   public boolean checkAnswer(String secret, String answer) {
     return answer.toLowerCase().equals(secret);
   }

src/main/java/lc/captchas/interfaces/ChallengeProvider.java

@@ -1,5 +1,8 @@
 package lc.captchas.interfaces;
 
+import java.util.Map;
+import java.util.List;
+
 public interface ChallengeProvider {
   public String getId();
 
@@ -8,4 +11,6 @@ public interface ChallengeProvider {
   public boolean checkAnswer(String secret, String answer);
 
   public void configure(String config);
+
+  public Map<String, List<String>> supportedParameters();
 }

src/main/scala/lc/captchas/FilterChallenge.scala

@@ -7,6 +7,8 @@ import java.awt.Font
 import java.awt.Color
 import lc.captchas.interfaces.ChallengeProvider
 import lc.captchas.interfaces.Challenge
+import scala.jdk.CollectionConverters.MapHasAsJava
+import java.util.{List => JavaList, Map => JavaMap}
 
 class FilterChallenge extends ChallengeProvider {
   def getId = "FilterChallenge"
@@ -15,6 +17,16 @@ class FilterChallenge extends ChallengeProvider {
     // TODO: add custom config
   }
 
+  def supportedParameters(): JavaMap[String, JavaList[String]] = {
+    val supportedParams = Map(
+      "supportedLevels" -> JavaList.of("medium", "hard"),
+      "supportedMedia" -> JavaList.of("image/png"),
+      "supportedInputType" -> JavaList.of("text")
+    ).asJava
+
+    supportedParams
+  }
+
   def returnChallenge(): Challenge = {
     val filterTypes = List(new FilterType1, new FilterType2)
     val r = new scala.util.Random

src/main/scala/lc/captchas/LabelCaptcha.scala

@@ -9,6 +9,8 @@ import java.awt.image.BufferedImage
 import java.awt.Color
 import lc.captchas.interfaces.ChallengeProvider
 import lc.captchas.interfaces.Challenge
+import scala.jdk.CollectionConverters.MapHasAsJava
+import java.util.{List => JavaList, Map => JavaMap}
 
 class LabelCaptcha extends ChallengeProvider {
   private var knownFiles = new File("known").list.toList
@@ -27,6 +29,16 @@ class LabelCaptcha extends ChallengeProvider {
     // TODO: add custom config
   }
 
+  def supportedParameters(): JavaMap[String, JavaList[String]] = {
+    val supportedParams = Map(
+      "supportedLevels" -> JavaList.of("hard"),
+      "supportedMedia" -> JavaList.of("image/png"),
+      "supportedInputType" -> JavaList.of("text")
+    ).asJava
+
+    supportedParams
+  }
+
   def returnChallenge(): Challenge =
     synchronized {
       val r = scala.util.Random.nextInt(knownFiles.length)

src/main/scala/lc/captchas/RainDropsCaptcha.scala

@@ -10,6 +10,8 @@ import javax.imageio.stream.MemoryCacheImageOutputStream;
 import lc.captchas.interfaces.ChallengeProvider
 import lc.captchas.interfaces.Challenge
 import lc.misc.GifSequenceWriter
+import scala.jdk.CollectionConverters.MapHasAsJava
+import java.util.{List => JavaList, Map => JavaMap}
 
 class Drop {
   var x = 0
@@ -35,6 +37,16 @@ class RainDropsCP extends ChallengeProvider {
     // TODO: add custom config
   }
 
+  def supportedParameters(): JavaMap[String, JavaList[String]] = {
+    val supportedParams = Map(
+      "supportedLevels" -> JavaList.of("medium", "easy"),
+      "supportedMedia" -> JavaList.of("image/gif"),
+      "supportedInputType" -> JavaList.of("text")
+    ).asJava
+
+    supportedParams
+  }
+
   private def extendDrops(drops: Array[Drop], steps: Int, xOffset: Int) = {
     drops.map(d => {
       val nd = new Drop()