add config option to enable cors for dispatchserver (#579)

src/main/java/emu/grasscutter/Config.java

@@ -41,6 +41,8 @@ public final class Config {
 		public String KeystorePassword = "123456";
 		public Boolean UseSSL = true;
 		public Boolean FrontHTTPS = true;
+		public Boolean CORS = false;
+		public String[] CORSAllowedOrigins = new String[] { "*" };
 
 		public boolean AutomaticallyCreateAccounts = false;
 		public String[] defaultPermissions = new String[] { "" };

src/main/java/emu/grasscutter/server/dispatch/DispatchServer.java

@@ -245,8 +245,11 @@ public final class DispatchServer {
 			if(Grasscutter.getConfig().DebugMode == ServerDebugMode.ALL) {
 				config.enableDevLogging();
 			}
+			if (Grasscutter.getConfig().getDispatchOptions().CORS){
+				if (Grasscutter.getConfig().getDispatchOptions().CORSAllowedOrigins.length > 0) config.enableCorsForOrigin(Grasscutter.getConfig().getDispatchOptions().CORSAllowedOrigins);
+				else config.enableCorsForAllOrigins();
+			}
 		});
-
 		httpServer.get("/", (req, res) -> res.send(Grasscutter.getLanguage().Welcome));
 
 		httpServer.raw().error(404, ctx -> {