Start implementing server-side functionality.

lib/packets/ClientPackets.dart

@@ -0,0 +1,93 @@
+import 'dart:convert';
+
+import 'package:libac_flutter/nbt/NbtUtils.dart';
+import 'package:libac_flutter/nbt/Tag.dart';
+import 'package:libac_flutter/nbt/impl/CompoundTag.dart';
+import 'package:libac_flutter/nbt/impl/StringTag.dart';
+import 'package:libac_flutter/packets/packets.dart';
+import 'package:libac_flutter/utils/uuid/NbtUUID.dart';
+import 'package:libac_flutter/utils/uuid/UUID.dart';
+import 'package:servermanager/settings.dart';
+
+class ClientPackets {
+  static void register() {
+    PacketRegistry reg = PacketRegistry();
+    reg.register(C2SLoginPacket(), () {
+      return C2SLoginPacket();
+    });
+  }
+}
+
+class C2SLoginPacket implements IPacket {
+  String username = "";
+  String password = "";
+
+  @override
+  void decodeJson(String params) {
+    fromJson(json.decode(params));
+  }
+
+  @override
+  void decodeTag(Tag tag) {
+    CompoundTag ct = tag.asCompoundTag();
+    username = ct.get("username")!.asString();
+    password = ct.get("password")!.asString();
+  }
+
+  @override
+  NetworkDirection direction() {
+    return NetworkDirection.ClientToServer;
+  }
+
+  @override
+  String encodeJson() {
+    return json.encode(toJson());
+  }
+
+  @override
+  Tag encodeTag() {
+    CompoundTag tag = CompoundTag();
+    tag.put("username", StringTag.valueOf(username));
+    tag.put("password", StringTag.valueOf(password));
+
+    return tag;
+  }
+
+  @override
+  void fromJson(Map<String, dynamic> js) {
+    username = js['username'] as String;
+    password = js['password'] as String;
+  }
+
+  @override
+  String getChannelID() {
+    return "Login";
+  }
+
+  @override
+  Future<PacketResponse> handleServerPacket() async {
+    S2CResponse response = S2CResponse();
+
+    // Attempt to log in.
+    Settings settings = Settings();
+    if (settings.serverLoginCreds.username == username &&
+        settings.serverLoginCreds.password == password) {
+      NbtUtils.writeBoolean(response.contents, "valid", true);
+      settings.remoteLoginToken = UUID.generate(4);
+      NbtUtils.writeUUID(response.contents, "token",
+          NbtUUID.fromUUID(settings.remoteLoginToken));
+    } else {
+      NbtUtils.writeBoolean(response.contents, "valid", false);
+    }
+
+    return PacketResponse(replyDataTag: response.encodeTag().asCompoundTag());
+  }
+
+  @override
+  Map<String, dynamic> toJson() {
+    return {"username": username, "password": password};
+  }
+
+  @override
+  Future<void> handleClientPacket() async {}
+}