2 files changed, 220 insertions, 0 deletions
diff --git a/meshmc/launcher/notifications/NotificationChecker.cpp b/meshmc/launcher/notifications/NotificationChecker.cpp
new file mode 100644
index 0000000000..dee1510443
--- /dev/null
+++ b/meshmc/launcher/notifications/NotificationChecker.cpp
@@ -0,0 +1,146 @@
+/* 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/>.
+ */
+
+#include "NotificationChecker.h"
+
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QJsonArray>
+#include <QDebug>
+
+#include "net/Download.h"
+
+#include "Application.h"
+
+NotificationChecker::NotificationChecker(QObject* parent) : QObject(parent) {}
+
+void NotificationChecker::setNotificationsUrl(const QUrl& notificationsUrl)
+{
+	m_notificationsUrl = notificationsUrl;
+}
+
+void NotificationChecker::setApplicationChannel(QString channel)
+{
+	m_appVersionChannel = channel;
+}
+
+void NotificationChecker::setApplicationFullVersion(QString version)
+{
+	m_appFullVersion = version;
+}
+
+void NotificationChecker::setApplicationPlatform(QString platform)
+{
+	m_appPlatform = platform;
+}
+
+QList<NotificationChecker::NotificationEntry>
+NotificationChecker::notificationEntries() const
+{
+	return m_entries;
+}
+
+void NotificationChecker::checkForNotifications()
+{
+	if (!m_notificationsUrl.isValid()) {
+		qCritical()
+			<< "Failed to check for notifications. No notifications URL set."
+			<< "If you'd like to use MeshMC's notification system, please pass "
+			   "the "
+			   "URL to CMake at compile time.";
+		return;
+	}
+	if (m_checkJob) {
+		return;
+	}
+	m_checkJob =
+		new NetJob("Checking for notifications", APPLICATION->network());
+	auto entry =
+		APPLICATION->metacache()->resolveEntry("root", "notifications.json");
+	entry->setStale(true);
+	m_checkJob->addNetAction(
+		m_download = Net::Download::makeCached(m_notificationsUrl, entry));
+	connect(m_download.get(), &Net::Download::succeeded, this,
+			&NotificationChecker::downloadSucceeded);
+	m_checkJob->start();
+}
+
+void NotificationChecker::downloadSucceeded(int)
+{
+	m_entries.clear();
+
+	QFile file(m_download->getTargetFilepath());
+	if (file.open(QFile::ReadOnly)) {
+		QJsonArray root = QJsonDocument::fromJson(file.readAll()).array();
+		for (auto it = root.begin(); it != root.end(); ++it) {
+			QJsonObject obj = (*it).toObject();
+			NotificationEntry entry;
+			entry.id = obj.value("id").toDouble();
+			entry.message = obj.value("message").toString();
+			entry.channel = obj.value("channel").toString();
+			entry.platform = obj.value("platform").toString();
+			entry.from = obj.value("from").toString();
+			entry.to = obj.value("to").toString();
+			const QString type = obj.value("type").toString("critical");
+			if (type == "critical") {
+				entry.type = NotificationEntry::Critical;
+			} else if (type == "warning") {
+				entry.type = NotificationEntry::Warning;
+			} else if (type == "information") {
+				entry.type = NotificationEntry::Information;
+			}
+			if (entryApplies(entry))
+				m_entries.append(entry);
+		}
+	}
+
+	m_checkJob.reset();
+
+	emit notificationCheckFinished();
+}
+
+bool versionLessThan(const QString& v1, const QString& v2)
+{
+	QStringList l1 = v1.split('.');
+	QStringList l2 = v2.split('.');
+	while (!l1.isEmpty() && !l2.isEmpty()) {
+		int one = l1.isEmpty() ? 0 : l1.takeFirst().toInt();
+		int two = l2.isEmpty() ? 0 : l2.takeFirst().toInt();
+		if (one != two) {
+			return one < two;
+		}
+	}
+	return false;
+}
+
+bool NotificationChecker::entryApplies(
+	const NotificationChecker::NotificationEntry& entry) const
+{
+	bool channelApplies =
+		entry.channel.isEmpty() || entry.channel == m_appVersionChannel;
+	bool platformApplies =
+		entry.platform.isEmpty() || entry.platform == m_appPlatform;
+	bool fromApplies = entry.from.isEmpty() || entry.from == m_appFullVersion ||
+					   !versionLessThan(m_appFullVersion, entry.from);
+	bool toApplies = entry.to.isEmpty() || entry.to == m_appFullVersion ||
+					 !versionLessThan(entry.to, m_appFullVersion);
+	return channelApplies && platformApplies && fromApplies && toApplies;
+}
diff --git a/meshmc/launcher/notifications/NotificationChecker.h b/meshmc/launcher/notifications/NotificationChecker.h
new file mode 100644
index 0000000000..5ad1044d50
--- /dev/null
+++ b/meshmc/launcher/notifications/NotificationChecker.h
@@ -0,0 +1,74 @@
+/* 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 <QObject>
+
+#include "net/NetJob.h"
+#include "net/Download.h"
+
+class NotificationChecker : public QObject
+{
+	Q_OBJECT
+
+  public:
+	explicit NotificationChecker(QObject* parent = 0);
+
+	void setNotificationsUrl(const QUrl& notificationsUrl);
+	void setApplicationPlatform(QString platform);
+	void setApplicationChannel(QString channel);
+	void setApplicationFullVersion(QString version);
+
+	struct NotificationEntry {
+		int id;
+		QString message;
+		enum { Critical, Warning, Information } type;
+		QString channel;
+		QString platform;
+		QString from;
+		QString to;
+	};
+
+	QList<NotificationEntry> notificationEntries() const;
+
+  public slots:
+	void checkForNotifications();
+
+  private slots:
+	void downloadSucceeded(int);
+
+  signals:
+	void notificationCheckFinished();
+
+  private:
+	bool entryApplies(const NotificationEntry& entry) const;
+
+  private:
+	QList<NotificationEntry> m_entries;
+	QUrl m_notificationsUrl;
+	NetJob::Ptr m_checkJob;
+	Net::Download::Ptr m_download;
+
+	QString m_appVersionChannel;
+	QString m_appPlatform;
+	QString m_appFullVersion;
+};