update scala version in scripts

Update scala3-library to 3.6.2

.git-blame-ignore-revs

@@ -0,0 +1,5 @@
+# Scala Steward: Reformat with sbt-java-formatter 0.8.0
+57ce691a00babb03e0cae03a26fe56d63fc609af
+
+# Scala Steward: Reformat with scalafmt 3.6.1
+f2b19baca828a4d88b46bc009aef6d7115e63924

.github/scala-steward.conf

@@ -0,0 +1,3 @@
+# If true, Scala Steward will sign off all commits (e.g. `git --signoff`).
+# Default: false
+signoffCommits = true

.github/workflows/ci.yml

@@ -16,6 +16,7 @@ jobs:
       uses: actions/setup-java@v1
       with:
         java-version: 1.11
+    - uses: sbt/setup-sbt@v1
     - name: Run tests
       run: sbt test assembly
     - name: Run linter

.github/workflows/docker-latest.yml

@@ -54,6 +54,10 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          platforms: |
+            linux/amd64
+            linux/arm64
+            linux/arm/v7
 
       - name: Image digest
         run: echo ${{ steps.docker_build.outputs.digest }}

.scalafmt.conf

@@ -1,3 +1,3 @@
-version="3.5.0" 
+version="3.8.3" 
 maxColumn = 120
 runner.dialect = scala3

Dockerfile

@@ -1,9 +1,10 @@
-FROM adoptopenjdk/openjdk16:alpine AS base-builder
-ARG SBT_VERSION=1.6.2
-RUN apk add --no-cache bash
+FROM eclipse-temurin:17-jre-jammy AS base-builder
+ARG SBT_VERSION=1.7.1
 ENV JAVA_HOME="/usr/lib/jvm/default-jvm/"
 ENV PATH=$PATH:${JAVA_HOME}/bin
 RUN \
+        apt update && \
+        apt install -y wget && \
 	wget -O sbt-$SBT_VERSION.tgz https://github.com/sbt/sbt/releases/download/v$SBT_VERSION/sbt-$SBT_VERSION.tgz && \
         tar -xzvf sbt-$SBT_VERSION.tgz && \
         rm sbt-$SBT_VERSION.tgz
@@ -22,15 +23,15 @@ FROM sbt-builder as builder
 COPY src/ src/
 RUN sbt assembly
 
-FROM adoptopenjdk/openjdk16:alpine-jre  AS base-core
+FROM eclipse-temurin:17-jre-jammy  AS base-core
 ENV JAVA_HOME="/usr/lib/jvm/default-jvm/"
-RUN apk add --update ttf-dejavu
+RUN apt update && apt install -y fonts-dejavu
 ENV PATH=$PATH:${JAVA_HOME}/bin
 
 
 FROM base-core
 WORKDIR /lc-core
-COPY --from=builder /build/target/scala-3.1.1/LibreCaptcha.jar .
+COPY --from=builder /build/target/scala-3.6.2/LibreCaptcha.jar .
 RUN mkdir data/
 
 EXPOSE 8888

README.md

@@ -2,12 +2,12 @@
 LibreCaptcha is a framework that allows developers to create their own [CAPTCHA](https://en.wikipedia.org/wiki/CAPTCHA)s.
 The framework defines the API for a CAPTCHA generator and takes care of mundane details
 such as:
-  * An HTTP interface for serving CAPTCHAs
-  * Background workers to pre-compute CAPTCHAs and to store them in a database
-  * Managing secrets for the CAPTCHAs (tokens, expected answers, etc)
-  * Safe re-impressions of CAPTCHA images (by creating unique tokens for every impression)
-  * Garbage collection of stale CAPTCHAs
-  * Sandboxed plugin architecture (TBD)
+* An HTTP interface for serving CAPTCHAs
+* Background workers to pre-compute CAPTCHAs and to store them in a database
+* Managing secrets for the CAPTCHAs (tokens, expected answers, etc)
+* Safe re-impressions of CAPTCHA images (by creating unique tokens for every impression)
+* Garbage collection of stale CAPTCHAs
+* Sandboxed plugin architecture (TBD)
 
 Some sample CAPTCHA generators are included in the distribution (see below). We will continue adding more samples to the list. For quick
 deployments the samples themselves might be sufficient. Projects with more resources might want create their own CAPTCHAs
@@ -47,18 +47,25 @@ docker-compose up
 Using `docker`:
 
 ```
-docker run -v lcdata:/lc-core/data librecaptcha/lc-core:1.1.0-stable
+docker run -p=8888:8888 -v ./lcdata:/lc-core/data librecaptcha/lc-core:2.0
 ```
 
 A default `config.json` is automatically created in the mounted volume.
 
+The above commands should work with `podman` as well, if docker.io registry is pre-configured. Otherwise,
+you can manually specify the repository like so:
+
+```
+podman run -p=8888:8888 -v ./lcdata:/lc-core/data docker.io/librecaptcha/lc-core:2.0
+```
+
 ## Quick test
 Open [localhost:8888/demo/index.html](http://localhost:8888/demo/index.html) in browser.
 
 Alternatively, on the command line, try:
 
 ```
-> $ curl -d '{"media":"image/png","level":"easy","input_type":"text"}' localhost:8888/v1/captcha
+> $ curl -d '{"media":"image/png","level":"easy","input_type":"text","size":"350x100"}' localhost:8888/v2/captcha
 {"id":"3bf928ce-a1e7-4616-b34f-8252d777855d"}
 
 > $ curl "localhost:8888/v1/media?id=3bf928ce-a1e7-4616-b34f-8252d777855d" -o sample.png
@@ -124,48 +131,48 @@ If a sufficient number of users agree on their answer to the unknown word, it is
 The service can be accessed using a simple HTTP API.
 
 ### - `/v1/captcha`: `POST`
-  - Parameters:
+- Parameters:
     - `level`: `String` -
       The difficulty level of a captcha
-       - easy
-       - medium
-       - hard
+        - easy
+        - medium
+        - hard
     - `input_type`: `String` -
       The type of input option for a captcha
-       - text
-       - (More to come)
+        - text
+        - (More to come)
     - `media`: `String` -
       The type of media of a captcha
-       - image/png
-       - image/gif
-       - (More to come)
+        - image/png
+        - image/gif
+        - (More to come)
     - `size`: String -
       The dimensions of a captcha. It needs to be a string in the format `"widthxheight"` in pixels, and will be matched
       with the `allowedSizes` config setting. Example: `size: "450x200"` which requests an image of width 450 and height
       200 pixels.
 
-  - Returns:
+- Returns:
     - `id`: `String` - The uuid of the captcha generated
 
 
 ### - `/v1/media`: `GET`
-  - Parameters:
+- Parameters:
     - `id`: `String` - The uuid of the captcha
 
-  - Returns:
+- Returns:
     - `image`: `Array[Byte]` - The requested media as bytes
 
 
 ### - `/v1/answer`: `POST`
-  - Parameter:
+- Parameter:
     - `id`: `String` - The uuid of the captcha that needs to be solved
     - `answer`: `String` - The answer to the captcha that needs to be validated
 
-  - Returns:
+- Returns:
     - `result`: `String` - The result after validation/checking of the answer
-      - True - If the answer is correct
-      - False - If the answer is incorrect
-      - Expired - If the time limit to solve the captcha exceeds
+        - True - If the answer is correct
+        - False - If the answer is incorrect
+        - Expired - If the time limit to solve the captcha exceeds
 
 
 ## Example usage
@@ -173,9 +180,9 @@ The service can be accessed using a simple HTTP API.
 In javascript:
 
 ```js
-const resp = await fetch("/v1/captcha", {
-   method: 'POST',
-   body: JSON.stringify({level: "easy", media: "image/png", "input_type" : "text"})
+const resp = await fetch("/v2/captcha", {
+    method: 'POST',
+    body: JSON.stringify({level: "easy", media: "image/png", "input_type" : "text", size: "350x100"})
 })
 
 const respJson = await resp.json();
@@ -183,19 +190,19 @@ const respJson = await resp.json();
 let captchaId = null;
 
 if (resp.ok) {
-  // The CAPTCHA can be displayed using the data in respJson.
-  console.log(respJson);
-  // Store the id somewhere so that it can be used later for answer verification
-  captchaId = respJson.id;
+    // The CAPTCHA can be displayed using the data in respJson.
+    console.log(respJson);
+    // Store the id somewhere so that it can be used later for answer verification
+    captchaId = respJson.id;
 } else {
-  console.err(respJson);
+    console.err(respJson);
 }
 
 
 // When user submits an answer it can be sent to the server for verification thusly:
-const resp = await fetch("/v1/answer", {
-   method: 'POST',
-   body: JSON.stringify({id: captchaId, answer: "user input"})
+const resp = await fetch("/v2/answer", {
+    method: 'POST',
+    body: JSON.stringify({id: captchaId, answer: "user input"})
 });
 const respJson = await resp.json();
 console.log(respJson.result);

Runner.Dockerfile

@@ -1,12 +1,12 @@
-FROM adoptopenjdk/openjdk16:alpine-jre  AS base-core
+FROM eclipse-temurin:17-jre-jammy  AS base-core
 ENV JAVA_HOME="/usr/lib/jvm/default-jvm/"
-RUN apk add --update ttf-dejavu
+RUN apt update && apt install -y fonts-dejavu
 ENV PATH=$PATH:${JAVA_HOME}/bin
 
 
 FROM base-core
 RUN mkdir /lc-core
-COPY target/scala-3.1.1/LibreCaptcha.jar /lc-core
+COPY target/scala-3.6.2/LibreCaptcha.jar /lc-core
 WORKDIR /lc-core
 RUN mkdir data/
 

build.sbt

@@ -2,8 +2,8 @@ lazy val root = (project in file(".")).settings(
   inThisBuild(
     List(
       organization := "com.example",
-      scalaVersion := "3.1.1",
-      version := "0.1.0-SNAPSHOT",
+      scalaVersion := "3.6.2",
+      version := "0.2.1-snapshot",
       semanticdbEnabled := true,
       semanticdbVersion := scalafixSemanticdb.revision
 
@@ -12,9 +12,9 @@ lazy val root = (project in file(".")).settings(
     )
   ),
   name := "LibreCaptcha",
-  libraryDependencies += "com.sksamuel.scrimage" % "scrimage-core" % "4.0.31",
-  libraryDependencies += "com.sksamuel.scrimage" % "scrimage-filters" % "4.0.31",
-  libraryDependencies += "org.json4s" %% "json4s-jackson" % "4.0.4"
+  libraryDependencies += "com.sksamuel.scrimage" % "scrimage-core" % "4.3.0",
+  libraryDependencies += "com.sksamuel.scrimage" % "scrimage-filters" % "4.3.0",
+  libraryDependencies += "org.json4s" %% "json4s-jackson" % "4.0.7"
 )
 
 Compile / unmanagedResourceDirectories += { baseDirectory.value / "lib" }

project/build.properties

@@ -1 +1 @@
-sbt.version=1.6.2
+sbt.version=1.10.6

project/plugins.sbt

@@ -1,4 +1,4 @@
-addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.9.34")
-addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.6")
-addSbtPlugin("com.lightbend.sbt" % "sbt-java-formatter" % "0.7.0")
-addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "1.2.0")
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.13.0")
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.2")
+addSbtPlugin("com.lightbend.sbt" % "sbt-java-formatter" % "0.8.0")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.0")

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

@@ -5,12 +5,12 @@ import java.awt.image.BufferedImage;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FilenameFilter;
-import java.util.Map;
 import java.util.List;
+import java.util.Map;
 import lc.captchas.interfaces.Challenge;
 import lc.captchas.interfaces.ChallengeProvider;
-import lc.misc.PngImageWriter;
 import lc.misc.HelperFunctions;
+import lc.misc.PngImageWriter;
 
 public class FontFunCaptcha implements ChallengeProvider {
 
@@ -58,7 +58,8 @@ public class FontFunCaptcha implements ChallengeProvider {
     return null;
   }
 
-  private byte[] fontFun(final int width, final int height, String captchaText, String level, String path) {
+  private byte[] fontFun(
+      final int width, final int height, String captchaText, String level, String path) {
     String[] colors = {"#f68787", "#f8a978", "#f1eb9a", "#a4f6a5"};
     BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
     Graphics2D graphics2D = img.createGraphics();
@@ -87,7 +88,8 @@ public class FontFunCaptcha implements ChallengeProvider {
     final int width = size2D[0];
     final int height = size2D[1];
     String path = "./lib/fonts/";
-    return new Challenge(fontFun(width, height, secret, "medium", path), "image/png", secret.toLowerCase());
+    return new Challenge(
+        fontFun(width, height, secret, "medium", path), "image/png", secret.toLowerCase());
   }
 
   public boolean checkAnswer(String secret, String answer) {

src/main/java/lc/captchas/PoppingCharactersCaptcha.java

@@ -1,26 +1,26 @@
 package lc.captchas;
 
-import java.awt.Font;
-import java.awt.RenderingHints;
 import java.awt.Color;
+import java.awt.Font;
 import java.awt.Graphics2D;
+import java.awt.RenderingHints;
 import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.util.List;
 import java.util.Map;
 import java.util.function.Consumer;
 import java.util.stream.IntStream;
-import java.util.List;
-
 import javax.imageio.stream.MemoryCacheImageOutputStream;
-import java.io.ByteArrayOutputStream;
 import lc.captchas.interfaces.Challenge;
 import lc.captchas.interfaces.ChallengeProvider;
-import lc.misc.HelperFunctions;
 import lc.misc.GifSequenceWriter;
+import lc.misc.HelperFunctions;
 
 public class PoppingCharactersCaptcha implements ChallengeProvider {
 
-  private int[] computeOffsets(final Font font, final int width, final int height, final String text) {
+  private int[] computeOffsets(
+      final Font font, final int width, final int height, final String text) {
     final var img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
     final var graphics2D = img.createGraphics();
     final var frc = graphics2D.getFontRenderContext();
@@ -32,17 +32,20 @@ public class PoppingCharactersCaptcha implements ChallengeProvider {
       advances[i] = currX;
       currX += font.getStringBounds(String.valueOf(c), frc).getWidth();
       currX += spacing;
-    };
+    }
+    ;
     advances[text.length()] = currX;
     graphics2D.dispose();
     return advances;
   }
 
-  private BufferedImage makeImage(final Font font, final int width, final int height, final Consumer<Graphics2D> f) {
+  private BufferedImage makeImage(
+      final Font font, final int width, final int height, final Consumer<Graphics2D> f) {
     final var img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
     final var graphics2D = img.createGraphics();
     graphics2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
-    graphics2D.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
+    graphics2D.setRenderingHint(
+        RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
     graphics2D.setFont(font);
     f.accept(graphics2D);
     graphics2D.dispose();
@@ -64,24 +67,38 @@ public class PoppingCharactersCaptcha implements ChallengeProvider {
       final var expectedWidth = advances[advances.length - 1];
       final var scale = width / (float) expectedWidth;
       final var prevColor = Color.getHSBColor(0f, 0f, 0.1f);
-      IntStream.range(0, text.length()).forEach(i -> {
-        final var color = Color.getHSBColor(HelperFunctions.randomNumber(0, 100)/100.0f, 0.6f, 1.0f);
-        final var nextImage = makeImage(font, width, height, (g) -> {
-          g.scale(scale, 1);
-          if (i > 0) {
-            final var prevI = (i - 1) % text.length();
-            g.setColor(prevColor);
-            g.drawString(String.valueOf(text.charAt(prevI)), advances[prevI] + jitter(), fontHeight*1.1f + jitter());
-          }
-          g.setColor(color);
-          g.drawString(String.valueOf(text.charAt(i)), advances[i] + jitter(), fontHeight*1.1f + jitter());
-        });
-        try {
-          writer.writeToSequence(nextImage);
-        } catch (final IOException e) {
-          e.printStackTrace();
-        }
-      });
+      IntStream.range(0, text.length())
+          .forEach(
+              i -> {
+                final var color =
+                    Color.getHSBColor(HelperFunctions.randomNumber(0, 100) / 100.0f, 0.6f, 1.0f);
+                final var nextImage =
+                    makeImage(
+                        font,
+                        width,
+                        height,
+                        (g) -> {
+                          g.scale(scale, 1);
+                          if (i > 0) {
+                            final var prevI = (i - 1) % text.length();
+                            g.setColor(prevColor);
+                            g.drawString(
+                                String.valueOf(text.charAt(prevI)),
+                                advances[prevI] + jitter(),
+                                fontHeight * 1.1f + jitter());
+                          }
+                          g.setColor(color);
+                          g.drawString(
+                              String.valueOf(text.charAt(i)),
+                              advances[i] + jitter(),
+                              fontHeight * 1.1f + jitter());
+                        });
+                try {
+                  writer.writeToSequence(nextImage);
+                } catch (final IOException e) {
+                  e.printStackTrace();
+                }
+              });
       writer.close();
       output.close();
       return byteArrayOutputStream.toByteArray();

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

@@ -1,20 +1,18 @@
 package lc.captchas;
 
-import java.awt.Graphics2D;
-import java.awt.RenderingHints;
 import java.awt.Color;
 import java.awt.Font;
+import java.awt.Graphics2D;
 import java.awt.image.BufferedImage;
 import java.awt.image.ConvolveOp;
 import java.awt.image.Kernel;
 import java.io.ByteArrayOutputStream;
-import java.util.Map;
 import java.util.List;
-
-import lc.misc.HelperFunctions;
-import lc.misc.PngImageWriter;
+import java.util.Map;
 import lc.captchas.interfaces.Challenge;
 import lc.captchas.interfaces.ChallengeProvider;
+import lc.misc.HelperFunctions;
+import lc.misc.PngImageWriter;
 
 public class ShadowTextCaptcha implements ChallengeProvider {
 
@@ -56,20 +54,24 @@ public class ShadowTextCaptcha implements ChallengeProvider {
     graphics2D.setPaint(Color.BLACK);
     graphics2D.setFont(font);
     final var stringWidth = graphics2D.getFontMetrics().stringWidth(text);
-    final var padding = (stringWidth > width) ? 0 : (width - stringWidth)/2;
-    final var scaleX = (stringWidth > width) ? width/((double) stringWidth) : 1d;
+    final var padding = (stringWidth > width) ? 0 : (width - stringWidth) / 2;
+    final var scaleX = (stringWidth > width) ? width / ((double) stringWidth) : 1d;
     graphics2D.scale(scaleX, 1d);
-    graphics2D.drawString(text, padding, fontHeight*1.1f);
+    graphics2D.drawString(text, padding, fontHeight * 1.1f);
     graphics2D.dispose();
     final int kernelSize = (int) Math.ceil((Math.min(width, height) / 50.0));
-    ConvolveOp op = new ConvolveOp(new Kernel(kernelSize, kernelSize, makeKernel(kernelSize)), ConvolveOp.EDGE_NO_OP, null);
+    ConvolveOp op =
+        new ConvolveOp(
+            new Kernel(kernelSize, kernelSize, makeKernel(kernelSize)),
+            ConvolveOp.EDGE_NO_OP,
+            null);
     BufferedImage img2 = op.filter(img, null);
     Graphics2D g2d = img2.createGraphics();
     HelperFunctions.setRenderingHints(g2d);
     g2d.setPaint(Color.WHITE);
     g2d.scale(scaleX, 1d);
     g2d.setFont(font);
-    g2d.drawString(text, padding-kernelSize, fontHeight*1.1f);
+    g2d.drawString(text, padding - kernelSize, fontHeight * 1.1f);
     g2d.dispose();
     ByteArrayOutputStream baos = new ByteArrayOutputStream();
     try {

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

@@ -1,7 +1,7 @@
 package lc.captchas.interfaces;
 
-import java.util.Map;
 import java.util.List;
+import java.util.Map;
 
 public interface ChallengeProvider {
   public String getId();

src/main/java/lc/misc/GifSequenceWriter.java

@@ -3,12 +3,12 @@
 
 package lc.misc;
 
-import javax.imageio.*;
-import javax.imageio.metadata.*;
-import javax.imageio.stream.*;
 import java.awt.image.*;
 import java.io.*;
 import java.util.Iterator;
+import javax.imageio.*;
+import javax.imageio.metadata.*;
+import javax.imageio.stream.*;
 
 public class GifSequenceWriter {
   protected ImageWriter gifWriter;

src/main/java/lc/misc/PngImageWriter.java

@@ -1,9 +1,9 @@
 package lc.misc;
 
+import java.awt.image.BufferedImage;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.util.Iterator;
-
 import javax.imageio.IIOImage;
 import javax.imageio.ImageIO;
 import javax.imageio.ImageTypeSpecifier;
@@ -13,7 +13,6 @@ import javax.imageio.metadata.IIOInvalidTreeException;
 import javax.imageio.metadata.IIOMetadata;
 import javax.imageio.metadata.IIOMetadataNode;
 import javax.imageio.stream.ImageOutputStream;
-import java.awt.image.BufferedImage;
 
 public class PngImageWriter {
 
@@ -26,7 +25,8 @@ public class PngImageWriter {
         iw.hasNext(); ) {
       ImageWriter writer = iw.next();
       ImageWriteParam writeParam = writer.getDefaultWriteParam();
-      ImageTypeSpecifier typeSpecifier = ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_INT_RGB);
+      ImageTypeSpecifier typeSpecifier =
+          ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_INT_RGB);
       IIOMetadata metadata = writer.getDefaultImageMetadata(typeSpecifier, writeParam);
       if (metadata.isReadOnly() || !metadata.isStandardMetadataFormatSupported()) {
         continue;

src/main/java/org/limium/picoserve/Server.java

@@ -3,21 +3,21 @@
 
 package org.limium.picoserve;
 
-import java.net.InetSocketAddress;
+import com.sun.net.httpserver.HttpExchange;
+import com.sun.net.httpserver.HttpHandler;
+import com.sun.net.httpserver.HttpServer;
 import java.io.IOException;
-import java.util.List;
-import java.util.Map;
-import java.util.LinkedList;
-import java.util.concurrent.Executor;
-import java.util.regex.Pattern;
-import java.util.Arrays;
-import java.util.Optional;
-import java.util.stream.Collectors;
+import java.net.InetSocketAddress;
 import java.net.URLDecoder;
 import java.nio.charset.StandardCharsets;
-import com.sun.net.httpserver.HttpServer;
-import com.sun.net.httpserver.HttpHandler;
-import com.sun.net.httpserver.HttpExchange;
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.Executor;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
 
 public final class Server {
   private final HttpServer server;

src/main/scala/lc/background/taskThread.scala

@@ -46,7 +46,7 @@ class BackgroundTask(config: Config, captchaManager: CaptchaManager) {
       (captcha.allowedLevels).flatMap { level =>
         (captcha.allowedMedia).flatMap { media =>
           (captcha.allowedInputType).flatMap { inputType =>
-            (captcha.allowedSizes).map {size =>
+            (captcha.allowedSizes).map { size =>
               Parameters(level, media, inputType, size)
             }
           }

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

@@ -43,16 +43,16 @@ class FilterChallenge extends ChallengeProvider {
     val height = size2D(1)
     val canvas = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB)
     val g = canvas.createGraphics()
-    val fontHeight = (height*0.6).toInt
+    val fontHeight = (height * 0.6).toInt
     g.setColor(Color.WHITE)
     g.fillRect(0, 0, canvas.getWidth, canvas.getHeight)
     g.setColor(Color.BLACK)
     val font = new Font("Serif", Font.BOLD, fontHeight)
     g.setFont(font)
     val stringWidth = g.getFontMetrics().stringWidth(secret)
-    val scaleX = if (stringWidth > width) width/(stringWidth.toDouble) else 1d
+    val scaleX = if (stringWidth > width) width / (stringWidth.toDouble) else 1d
     val margin = if (stringWidth > width) 0 else (width - stringWidth)
-    val xOffset = (margin*r.nextDouble).toInt
+    val xOffset = (margin * r.nextDouble).toInt
     g.scale(scaleX, 1d)
     g.drawString(secret, xOffset, fontHeight)
     g.dispose()

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

@@ -128,13 +128,13 @@ class RainDropsCP extends ChallengeProvider {
       val textX = if (textWidth > width) 0 else ((width - textWidth) / 2)
 
       // this will be overlapped by the following text to show the top outline because of the offset
-      val yOffset = (fontHeight*0.01).ceil.toInt
+      val yOffset = (fontHeight * 0.01).ceil.toInt
       g.setColor(textHighlightColor)
-      g.drawString(secret, textX, (fontHeight*1.1).toInt - yOffset)
+      g.drawString(secret, textX, (fontHeight * 1.1).toInt - yOffset)
 
       // paint the text
       g.setColor(textColor)
-      g.drawString(secret, textX, (fontHeight*1.1).toInt)
+      g.drawString(secret, textX, (fontHeight * 1.1).toInt)
 
       g.dispose()
       writer.writeToSequence(canvas)

src/main/scala/lc/core/models.scala

@@ -36,7 +36,7 @@ case class ConfigField(
   lazy val captchaExpiryTimeLimitInt: Option[Int] = mapInt(captchaExpiryTimeLimit)
   lazy val threadDelayInt: Option[Int] = mapInt(threadDelay)
   lazy val maxAttemptsRatioFloat: Option[Float] = mapFloat(maxAttemptsRatio)
-  lazy val playgroundEnabledBool: Option[Boolean] = playgroundEnabled.map(_ || true)
+  lazy val playgroundEnabledBool: Option[Boolean] = playgroundEnabled.map(_ || false)
 
   private def mapInt(x: Option[Integer]): Option[Int] = {
     x.map(_ + 0)

src/main/scala/lc/server/Server.scala

@@ -82,6 +82,7 @@ class Server(
         new StringResponse(200, str)
       }
     )
+    println("Playground enabled on /demo/index.html")
   }
 
   val server: picoserve.Server = serverBuilder.build()

tests/run.sh

@@ -4,7 +4,7 @@ python3 -m venv testEnv
 source ./testEnv/bin/activate
 pip install locust
 mkdir -p data/
-java -jar target/scala-3.1.1/LibreCaptcha.jar &
+java -jar target/scala-3.6.2/LibreCaptcha.jar &
 JAVA_PID=$!
 sleep 4
 
@@ -22,7 +22,7 @@ echo Run functional test
 cp data/config.json data/config.json.bak
 cp tests/debug-config.json data/config.json
 
-java -jar target/scala-3.1.1/LibreCaptcha.jar &
+java -jar target/scala-3.6.2/LibreCaptcha.jar &
 JAVA_PID=$!
 sleep 4