Protocol: update GetVersion with list of available request types

PROTOCOL.md

@@ -342,6 +342,7 @@ __Response__ : always OK, with these additional fields :
 - **"version"** (double) : OBSRemote API version. Fixed to 1.1 for retrocompatibility.
 - **"obs-websocket-version"** (string) : obs-websocket version string
 - **"obs-studio-version"** (string) : OBS Studio version string
+- **"available-requests"** (string) : comma-separated list of available request types
 
 ---
 

WSRequestHandler.cpp

@@ -18,12 +18,16 @@ with this program. If not, see <https://www.gnu.org/licenses/>
 */
 
 #include <obs-data.h>
-#include "WSRequestHandler.h"
+
+#include <QList>
+#include <QString>
+
 #include "WSEvents.h"
 #include "obs-websocket.h"
 #include "Config.h"
 #include "Utils.h"
-#include <qstring.h>
+
+#include "WSRequestHandler.h"
 
 bool str_valid(const char* str) {
     return (str != nullptr && strlen(str) > 0);
@@ -192,13 +196,21 @@ bool WSRequestHandler::hasField(const char* name) {
 void WSRequestHandler::HandleGetVersion(WSRequestHandler* req) {
     const char* obs_version = Utils::OBSVersionString();
 
+    QList<QString> names = req->messageMap.keys();
+    names.sort(Qt::CaseInsensitive);
+    QString requests;
+    requests += names.takeFirst();
+    for (QString reqName : names) {
+        requests += ("," + reqName);
+    }
+
     obs_data_t* data = obs_data_create();
     obs_data_set_double(data, "version", API_VERSION);
     obs_data_set_string(data, "obs-websocket-version", OBS_WEBSOCKET_VERSION);
     obs_data_set_string(data, "obs-studio-version", obs_version);
+    obs_data_set_string(data, "available-requests", requests.toUtf8().constData());
 
     req->SendOKResponse(data);
-
     obs_data_release(data);
     bfree((void*)obs_version);
 }

WSRequestHandler.h

@@ -20,6 +20,7 @@ with this program. If not, see <https://www.gnu.org/licenses/>
 #ifndef WSREQUESTHANDLER_H
 #define WSREQUESTHANDLER_H
 
+#include <QMap>
 #include <QWebSocket>
 #include <QWebSocketServer>