UI: Add SendChatMessage to YouTube API wrappers

UI/data/locale/en-US.ini

@@ -1326,3 +1326,8 @@ YouTube.Errors.livePermissionBlocked="Live streaming is unavailable on the selec
 YouTube.Errors.errorExecutingTransition="Transition failed due to a backend error. Please try again in a few seconds."
 YouTube.Errors.errorStreamInactive="YouTube is not receiving data for your stream. Please check your configuration and try again."
 YouTube.Errors.invalidTransition="The attempted transition was invalid. This may be due to the stream not having finished a previous transition. Please wait a few seconds and try again."
+# Chat errors
+YouTube.Errors.liveChatDisabled="Live chat is disabled on this stream."
+YouTube.Errors.liveChatEnded="Live stream has ended."
+YouTube.Errors.messageTextInvalid="The message text is not valid."
+YouTube.Errors.rateLimitExceeded="You are sending messages too quickly."

UI/window-youtube-actions.cpp

@@ -497,7 +497,8 @@ bool OBSYoutubeActions::CreateEventAction(YoutubeApiWrappers *api,
 			blog(LOG_DEBUG, "No stream created.");
 			return false;
 		}
-		if (!apiYouTube->BindStream(broadcast.id, stream.id)) {
+		json11::Json json;
+		if (!apiYouTube->BindStream(broadcast.id, stream.id, json)) {
 			blog(LOG_DEBUG, "No stream binded.");
 			return false;
 		}
@@ -547,7 +548,8 @@ bool OBSYoutubeActions::ChooseAnEventAction(YoutubeApiWrappers *api,
 			blog(LOG_DEBUG, "No stream created.");
 			return false;
 		}
-		if (!apiYouTube->BindStream(selectedBroadcast, stream.id)) {
+		if (!apiYouTube->BindStream(selectedBroadcast, stream.id,
+					    json)) {
 			blog(LOG_DEBUG, "No stream binded.");
 			return false;
 		}

UI/youtube-api-wrappers.cpp

@@ -29,6 +29,7 @@ using namespace json11;
 #define YOUTUBE_LIVE_TOKEN_URL "https://oauth2.googleapis.com/token"
 #define YOUTUBE_LIVE_VIDEOCATEGORIES_URL YOUTUBE_LIVE_API_URL "/videoCategories"
 #define YOUTUBE_LIVE_VIDEOS_URL YOUTUBE_LIVE_API_URL "/videos"
+#define YOUTUBE_LIVE_CHAT_MESSAGES_URL YOUTUBE_LIVE_API_URL "/liveChat/messages"
 #define YOUTUBE_LIVE_THUMBNAIL_URL \
 	"https://www.googleapis.com/upload/youtube/v3/thumbnails/set"
 
@@ -274,7 +275,8 @@ bool YoutubeApiWrappers::InsertStream(StreamDescription &stream)
 }
 
 bool YoutubeApiWrappers::BindStream(const QString broadcast_id,
-				    const QString stream_id)
+				    const QString stream_id,
+				    json11::Json &json_out)
 {
 	lastErrorMessage.clear();
 	lastErrorReason.clear();
@@ -285,7 +287,6 @@ bool YoutubeApiWrappers::BindStream(const QString broadcast_id,
 	const QString url = url_template.arg(broadcast_id, stream_id);
 	const Json data = Json::object{};
 	this->broadcast_id = broadcast_id;
-	Json json_out;
 	return InsertCommand(QT_TO_UTF8(url), "application/json", "",
 			     data.dump().c_str(), json_out);
 }
@@ -583,3 +584,22 @@ bool YoutubeApiWrappers::FindStream(const QString &id, json11::Json &json_out)
 
 	return true;
 }
+
+bool YoutubeApiWrappers::SendChatMessage(const std::string &chat_id,
+					 const QString &message)
+{
+	QByteArray url = YOUTUBE_LIVE_CHAT_MESSAGES_URL "?part=snippet";
+
+	json11::Json json_in = Json::object{
+		{"snippet",
+		 Json::object{
+			 {"liveChatId", chat_id},
+			 {"type", "textMessageEvent"},
+			 {"textMessageDetails",
+			  Json::object{{"messageText", QT_TO_UTF8(message)}}},
+		 }}};
+
+	json11::Json json_out;
+	return InsertCommand(url, "application/json", "POST",
+			     json_in.dump().c_str(), json_out);
+}

UI/youtube-api-wrappers.hpp

@@ -57,7 +57,8 @@ public:
 	bool GetChannelDescription(ChannelDescription &channel_description);
 	bool InsertBroadcast(BroadcastDescription &broadcast);
 	bool InsertStream(StreamDescription &stream);
-	bool BindStream(const QString broadcast_id, const QString stream_id);
+	bool BindStream(const QString broadcast_id, const QString stream_id,
+			json11::Json &json_out);
 	bool GetBroadcastsList(json11::Json &json_out, const QString &page,
 			       const QString &status);
 	bool
@@ -74,6 +75,8 @@ public:
 			    json11::Json &json_out);
 	bool StartLatestBroadcast();
 	bool StopLatestBroadcast();
+	bool SendChatMessage(const std::string &chat_id,
+			     const QString &message);
 
 	void SetBroadcastId(QString &broadcast_id);
 	QString GetBroadcastId();