From 137b9cd6703f0999023fa5ee99f8544ada216f6c Mon Sep 17 00:00:00 2001
From: Micle <micle@micle.dev>
Date: Sat, 21 May 2022 20:55:46 +0100
Subject: [PATCH] Created a network manager for better implementation of
 network related content.

---
 .../network/NetworkManager.java               | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 src/main/java/dev/micle/loginprotection/network/NetworkManager.java

diff --git a/src/main/java/dev/micle/loginprotection/network/NetworkManager.java b/src/main/java/dev/micle/loginprotection/network/NetworkManager.java
new file mode 100644
index 0000000..9fd3cbb
--- /dev/null
+++ b/src/main/java/dev/micle/loginprotection/network/NetworkManager.java
@@ -0,0 +1,64 @@
+package dev.micle.loginprotection.network;
+
+import dev.micle.loginprotection.LoginProtection;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraftforge.network.NetworkRegistry;
+import net.minecraftforge.network.simple.SimpleChannel;
+
+import java.util.regex.Pattern;
+
+public class NetworkManager {
+    private static final String VERSION = LoginProtection.MOD_ID + "1";
+    private static final Pattern NET_VERSION_PATTERN = Pattern.compile(String.format("/^%s-net-\\d+$/", LoginProtection.MOD_ID));
+    private static final Pattern MOD_VERSION_PATTERN = Pattern.compile("/^Forge-\\d+\\.\\d+\\.\\d+-\\d+\\.\\d+\\.\\d+$/");
+    private static SimpleChannel channel;
+
+    public static void init() {
+        // Create channel
+        channel = NetworkRegistry.ChannelBuilder.named(LoginProtection.createResourceLocation("network"))
+                .clientAcceptedVersions(v -> v.equals(VERSION))
+                .serverAcceptedVersions(v -> v.equals(VERSION))
+                .networkProtocolVersion(() -> VERSION)
+                .simpleChannel();
+
+        // Register packets
+        int id = 0;
+    }
+
+    public static void writeVersionInfo(FriendlyByteBuf buffer, boolean senderIsServer) {
+        buffer.writeBoolean(senderIsServer);
+        buffer.writeUtf(VERSION);
+        buffer.writeUtf(LoginProtection.getVersion());
+    }
+
+    public static void checkVersion(FriendlyByteBuf buffer) {
+        boolean senderIsServer = buffer.readBoolean();
+        String serverNetVersion = (senderIsServer) ? readNetVersion(buffer) : VERSION;
+        String serverModVersion = (senderIsServer) ? readModVersion(buffer) : LoginProtection.getVersion();
+        String clientNetVersion = (senderIsServer) ? VERSION : readNetVersion(buffer);
+        String clientModVersion = (senderIsServer) ? LoginProtection.getVersion() : readModVersion(buffer);
+
+        if (!serverNetVersion.equals(clientNetVersion)) {
+            throw new MismatchedVersionException(String.format("The server and client are running mismatched " +
+                    "versions of [Micle's Login Protection]. Try updating this mod on either the client and or " +
+                    "the server. Client version is %s (%s). Server version is %s (%s).", clientModVersion,
+                    clientNetVersion, serverModVersion, serverNetVersion));
+        }
+    }
+
+    public static String readNetVersion(FriendlyByteBuf buffer) {
+        String netVersion = buffer.readUtf();
+        if (!NET_VERSION_PATTERN.matcher(netVersion).matches()) {
+            return String.format("UNKNOWN (%s)", netVersion);
+        }
+        return netVersion;
+    }
+
+    public static String readModVersion(FriendlyByteBuf buffer) {
+        String modVersion = buffer.readUtf();
+        if (!modVersion.equals("NONE") && !MOD_VERSION_PATTERN.matcher(modVersion).matches()) {
+            return String.format("UNKNOWN (%s)", modVersion);
+        }
+        return modVersion;
+    }
+}