Init

src/main/java/systems/brn/chatencryptor/ChatDecryptorClient.java

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+package systems.brn.chatencryptor;
+
+import net.fabricmc.api.ClientModInitializer;
+import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents;
+import net.fabricmc.fabric.api.client.message.v1.ClientReceiveMessageEvents;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.text.Text;
+import net.minecraft.text.TranslatableTextContent;
+import java.util.Base64;
+
+public class ChatDecryptorClient implements ClientModInitializer {
+    @Override
+    public void onInitializeClient() {
+        ClientLifecycleEvents.CLIENT_STARTED.register(client -> {
+            // Register event listener for ClientTickEvents.END_CLIENT_TICK
+            ClientReceiveMessageEvents.ALLOW_CHAT.register((message, signedMessage, sender, params, receptionTimestamp) -> {
+                TranslatableTextContent content = (TranslatableTextContent) message.getContent();
+                String message_content = content.getArg(1).getString();
+                if(message_content.startsWith("BRNCrypt:")){
+                    String strippedMessage = message_content.replace("BRNCrypt:", "");
+                    String decodedMessage = new String(Base64.getDecoder().decode(strippedMessage));
+                    String outputMessage = "Decoded:" + decodedMessage;
+                    MinecraftClient.getInstance().inGameHud.getChatHud().addMessage(Text.of(outputMessage));
+                    return false;
+                }
+                else {
+                    MinecraftClient.getInstance().inGameHud.getChatHud().addMessage(Text.of("S:" + message_content + ":E"));
+                    return false;
+                }
+                //return true;
+            });
+        });
+    }
+}

src/main/java/systems/brn/chatencryptor/ChatEncryptorClient.java

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+package systems.brn.chatencryptor;
+
+import net.fabricmc.api.ClientModInitializer;
+import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents;
+import net.fabricmc.fabric.api.client.message.v1.ClientSendMessageEvents;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+
+public class ChatEncryptorClient implements ClientModInitializer {
+    @Override
+    public void onInitializeClient() {
+        ClientLifecycleEvents.CLIENT_STARTED.register(client -> {
+            // Register event listener for ClientTickEvents.END_CLIENT_TICK
+            ClientSendMessageEvents.MODIFY_CHAT.register(message -> {
+                String encodedMessage = Base64.getEncoder().withoutPadding().encodeToString(message.getBytes(StandardCharsets.UTF_8));
+                return "BRNCrypt:" + encodedMessage;
+            });
+        });
+    }
+}

src/main/resources/chatencryptor.mixins.json

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+{
+  "required": true,
+  "minVersion": "0.8",
+  "package": "systems.brn.chatencryptor",
+  "compatibilityLevel": "JAVA_17",
+  "mixins": [
+  ],
+  "client": [
+  ],
+  "injectors": {
+    "defaultRequire": 1
+  }
+}

src/main/resources/fabric.mod.json

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+{
+  "schemaVersion": 1,
+  "id": "chatencryptor",
+  "version": "${version}",
+  "name": "chatencryptor",
+  "description": "",
+  "authors": [
+    "BRNSystems"
+  ],
+  "contact": {
+    "website": "https://git.brn.systems/BRNSystems/chatencryptor",
+    "repo": "https://git.brn.systems/BRNSystems/chatencryptoratencryptor"
+  },
+  "license": "MIT",
+  "icon": "icon.png",
+  "environment": "client",
+  "entrypoints": {
+    "client": [
+      "systems.brn.chatencryptor.ChatEncryptorClient",
+      "systems.brn.chatencryptor.ChatDecryptorClient"
+    ]
+  },
+  "mixins": [
+    "chatencryptor.mixins.json"
+  ],
+  "depends": {
+    "fabricloader": ">=${loader_version}",
+    "fabric": "*",
+    "minecraft": "${minecraft_version}"
+  }
+}