Subsonic API: handle extensions

src/libs/subsonic/impl/entrypoints/System.cpp

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+#include "entrypoints/System.hpp"
+
+namespace API::Subsonic
+{
+    Response handlePingRequest(RequestContext& context)
+    {
+        return Response::createOkResponse(context.serverProtocolVersion);
+    }
+
+    Response handleGetLicenseRequest(RequestContext& context)
+    {
+        Response response{ Response::createOkResponse(context.serverProtocolVersion) };
+
+        Response::Node& licenseNode{ response.createNode("license") };
+        licenseNode.setAttribute("licenseExpires", "2025-09-03T14:46:43");
+        licenseNode.setAttribute("email", "foo@bar.com");
+        licenseNode.setAttribute("valid", true);
+
+        return response;
+    }
+
+    Response handleGetOpenSubsonicExtensions(RequestContext& context)
+    {
+        Response response{ Response::createOkResponse(context.serverProtocolVersion) };
+
+        {
+            Response::Node& transcodeOffsetNode{ response.createNode("openSubsonicExtensions") };
+            transcodeOffsetNode.setAttribute("name", "transcodeOffset");
+            transcodeOffsetNode.addArrayValue("versions", 1);
+        }
+
+        return response;
+    };
+}

src/libs/subsonic/impl/entrypoints/System.hpp

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+/*
+ * Copyright (C) 2023 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS 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.
+ *
+ * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "RequestContext.hpp"
+#include "SubsonicResponse.hpp"
+
+namespace API::Subsonic
+{
+    Response handlePingRequest(RequestContext& context);
+    Response handleGetLicenseRequest(RequestContext& context);
+    Response handleGetOpenSubsonicExtensions(RequestContext& context);
+}