requesthandler: Add private source settings get/set requests

It was requested via Discord to be able to modify the private settings
of any private source, since that functionality is used by some client
software to store stateful data. As private settings are in territory
that no normal user should ever tread into, these requests will be left
undocumented.

src/requesthandler/RequestHandler.cpp

@@ -56,6 +56,8 @@ const std::unordered_map<std::string, RequestMethodHandler> RequestHandler::_han
 	{"GetSourceActive", &RequestHandler::GetSourceActive},
 	{"GetSourceScreenshot", &RequestHandler::GetSourceScreenshot},
 	{"SaveSourceScreenshot", &RequestHandler::SaveSourceScreenshot},
+	{"GetSourcePrivateSettings", &RequestHandler::GetSourcePrivateSettings},
+	{"SetSourcePrivateSettings", &RequestHandler::SetSourcePrivateSettings},
 
 	// Scenes
 	{"GetSceneList", &RequestHandler::GetSceneList},

src/requesthandler/RequestHandler.h

@@ -74,6 +74,8 @@ class RequestHandler {
 		RequestResult GetSourceActive(const Request&);
 		RequestResult GetSourceScreenshot(const Request&);
 		RequestResult SaveSourceScreenshot(const Request&);
+		RequestResult GetSourcePrivateSettings(const Request&);
+		RequestResult SetSourcePrivateSettings(const Request&);
 
 		// Scenes
 		RequestResult GetSceneList(const Request&);

src/requesthandler/RequestHandler_SceneItems.cpp

@@ -675,8 +675,6 @@ RequestResult RequestHandler::GetSceneItemBlendMode(const Request& request)
 	return RequestResult::Success(responseData);
 }
 
-
-
 /**
  * Sets the blend mode of a scene item.
  *

src/requesthandler/RequestHandler_Sources.cpp

@@ -312,3 +312,39 @@ RequestResult RequestHandler::SaveSourceScreenshot(const Request& request)
 
 	return RequestResult::Success();
 }
+
+// Intentionally undocumented
+RequestResult RequestHandler::GetSourcePrivateSettings(const Request& request)
+{
+	RequestStatus::RequestStatus statusCode;
+	std::string comment;
+	OBSSourceAutoRelease source = request.ValidateSource("sourceName", statusCode, comment);
+	if (!source)
+		return RequestResult::Error(statusCode, comment);
+
+	OBSDataAutoRelease privateSettings = obs_source_get_private_settings(source);
+
+	json responseData;
+	responseData["sourceSettings"] = Utils::Json::ObsDataToJson(privateSettings);
+
+	return RequestResult::Success(responseData);
+}
+
+// Intentionally undocumented
+RequestResult RequestHandler::SetSourcePrivateSettings(const Request& request)
+{
+	RequestStatus::RequestStatus statusCode;
+	std::string comment;
+	OBSSourceAutoRelease source = request.ValidateSource("sourceName", statusCode, comment);
+	if (!source || !request.ValidateObject("sourceSettings", statusCode, comment))
+		return RequestResult::Error(statusCode, comment);
+
+	OBSDataAutoRelease privateSettings = obs_source_get_private_settings(source);
+
+	OBSDataAutoRelease newSettings = Utils::Json::JsonToObsData(request.RequestData["sourceSettings"]);
+
+	// Always overlays to prevent destroying internal source data unintentionally
+	obs_data_apply(privateSettings, newSettings);
+
+	return RequestResult::Success();
+}