Untested ETag cache class.

Yep.

logic/net/HttpMetaCache.h

@@ -0,0 +1,36 @@
+#pragma once
+#include <QString>
+#include <QSharedPointer>
+#include <QMap>
+
+struct MetaEntry
+{
+	QString base;
+	QString path;
+	QString md5sum;
+	QString etag;
+	quint64 last_changed_timestamp = 0;
+};
+
+typedef QSharedPointer<MetaEntry> MetaEntryPtr;
+
+class HttpMetaCache
+{
+public:
+	// supply path to the cache index file
+	HttpMetaCache(QString path);
+	~HttpMetaCache();
+	MetaEntryPtr getEntryForResource(QString base, QString resource_path);
+	void addEntry(QString base, QString resource_path, QString etag);
+	void addBase(QString base, QString base_root);
+private:
+	void Save();
+	void Load();
+	struct EntryMap
+	{
+		QString base_path;
+		QMap<QString, MetaEntryPtr> entry_list;
+	};
+	QMap<QString, EntryMap> m_entries;
+	QString m_index_file;
+};