Capital letters check

README.md

@@ -49,6 +49,7 @@ You can find the documentation for FairyChat [here](https://github.com/rexlManu/
 | `/fairychat`               |                                      | Show information about FairyChat                    |
 | `/fairychat reload`        | `fairychat.command.fairychat.reload` | Reload the configuration                            |
 |                            | `fairychat.bypass.similarity`        | Bypass the similarity check for last message        |
+|                            | `fairychat.bypass.capitals`          | Bypass the capital letters check                    |
 |                            | `fairychat.bypass.cooldown`          | Bypass the chat cooldown                            |
 |                            | `fairychat.feature.displayitem`      | Allow players to show the item in and with <item>   |
 |                            | `fairychat.messages.join.ignore`     | The join message will not be sent                   |

src/main/java/de/rexlmanu/fairychat/plugin/configuration/PluginConfiguration.java

@@ -109,6 +109,12 @@ public class PluginConfiguration {
   @Comment("How similar the messages have to be to be considered a duplicate.")
   private double similarityPercentage = 0.75;
 
+  @Comment("Prevent excessive capital letters being used.")
+  private boolean preventExcessiveCapitals = false;
+
+  @Comment("How much of the message has to be in capital letters to be considered excessive.")
+  private double capitalPercentage = 0.75;
+
   @Comment({
     "The similarity algorithm that should be used.",
     "Supported algorithms:",

src/main/java/de/rexlmanu/fairychat/plugin/core/capitals/CapitalsService.java

@@ -0,0 +1,47 @@
+package de.rexlmanu.fairychat.plugin.core.capitals;
+
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.Singleton;
+import de.rexlmanu.fairychat.plugin.configuration.PluginConfiguration;
+import lombok.RequiredArgsConstructor;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+
+@Singleton
+@RequiredArgsConstructor(onConstructor = @__(@Inject))
+public class CapitalsService {
+  private final Provider<PluginConfiguration> configurationProvider;
+  private final MiniMessage miniMessage;
+
+  public Component checkCapitals(Component message) {
+
+    if (!this.configurationProvider.get().preventExcessiveCapitals()) {
+        return message;
+    }
+    String miniTextMessage = this.miniMessage.serialize(message);
+    int count = 0;
+      for (int i = 0; i < miniTextMessage.length(); i++) {
+        char c = miniTextMessage.charAt(i);
+        if (c >= 'A' && c <= 'Z')
+            count++;
+    }
+    double percentageCapitals = (double) count / miniTextMessage.length();
+
+    if (percentageCapitals < this.configurationProvider.get().capitalPercentage()) {
+        return message;
+    }
+
+    StringBuilder sb = new StringBuilder(miniTextMessage.length());
+    for (int i = 0; i < miniTextMessage.length(); i++) {
+        char c = miniTextMessage.charAt(i);
+        if (c >= 'A' && c <= 'Z') {
+            sb.append((char)(c + 32));
+        } else {
+            sb.append(c);
+        }
+    }
+
+    return this.miniMessage.deserialize(sb.toString());
+  }
+}

src/main/java/de/rexlmanu/fairychat/plugin/core/playerchat/PlayerChatFormatRenderer.java

@@ -5,6 +5,7 @@
 import com.google.inject.Singleton;
 import com.google.inject.name.Named;
 import de.rexlmanu.fairychat.plugin.configuration.PluginConfiguration;
+import de.rexlmanu.fairychat.plugin.core.capitals.CapitalsService;
 import de.rexlmanu.fairychat.plugin.core.ignore.UserIgnoreService;
 import de.rexlmanu.fairychat.plugin.core.mentions.MentionService;
 import de.rexlmanu.fairychat.plugin.integration.IntegrationRegistry;
@@ -33,6 +34,7 @@ public class PlayerChatFormatRenderer implements DefaultChatRenderer {
   private final MiniMessage miniMessage;
   private final PermissionProvider permissionProvider;
   private final MentionService mentionService;
+  private final CapitalsService capitalsService;
   private final IntegrationRegistry registry;
   private final UserIgnoreService userIgnoreService;
 
@@ -69,7 +71,9 @@ public Component formatMessage(@NotNull Player source, @NotNull Component messag
     if (this.configurationProvider.get().legacyColorSupport()) {
       serializer = LegacyComponentSerializer.legacyAmpersand()::serialize;
     }
-    final String textMessage = this.resolveMessageModifiers(source, serializer.apply(message));
+    final String textMessage = this.resolveMessageModifiers(source, serializer.apply(
+      source.hasPermission("fairychat.bypass.capitals") ? message : this.capitalsService.checkCapitals(message))
+    );
 
     // Check if the player has the permission to use mini message
     if (source.hasPermission("fairychat.feature.minimessage")) {