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diff --git a/meshmc/launcher/net/Sink.h b/meshmc/launcher/net/Sink.h
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+++ b/meshmc/launcher/net/Sink.h
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+/* SPDX-FileCopyrightText: 2026 Project Tick
+ * SPDX-FileContributor: Project Tick
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   MeshMC - A Custom Launcher for Minecraft
+ *   Copyright (C) 2026 Project Tick
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "net/NetAction.h"
+
+#include "Validator.h"
+
+namespace Net
+{
+	class Sink
+	{
+	  public: /* con/des */
+		Sink() {};
+		virtual ~Sink() {};
+
+	  public: /* methods */
+		virtual JobStatus init(QNetworkRequest& request) = 0;
+		virtual JobStatus write(QByteArray& data) = 0;
+		virtual JobStatus abort() = 0;
+		virtual JobStatus finalize(QNetworkReply& reply) = 0;
+		virtual bool hasLocalData() = 0;
+
+		void addValidator(Validator* validator)
+		{
+			if (validator) {
+				validators.push_back(std::shared_ptr<Validator>(validator));
+			}
+		}
+
+	  protected: /* methods */
+		bool finalizeAllValidators(QNetworkReply& reply)
+		{
+			for (auto& validator : validators) {
+				if (!validator->validate(reply))
+					return false;
+			}
+			return true;
+		}
+		bool failAllValidators()
+		{
+			bool success = true;
+			for (auto& validator : validators) {
+				success &= validator->abort();
+			}
+			return success;
+		}
+		bool initAllValidators(QNetworkRequest& request)
+		{
+			for (auto& validator : validators) {
+				if (!validator->init(request))
+					return false;
+			}
+			return true;
+		}
+		bool writeAllValidators(QByteArray& data)
+		{
+			for (auto& validator : validators) {
+				if (!validator->write(data))
+					return false;
+			}
+			return true;
+		}
+
+	  protected: /* data */
+		std::vector<std::shared_ptr<Validator>> validators;
+	};
+} // namespace Net