1 files changed, 39 insertions, 0 deletions

diff --git a/subprojects/language-web/src/main/java/tools/refinery/language/web/config/BackendConfigServlet.java b/subprojects/language-web/src/main/java/tools/refinery/language/web/config/BackendConfigServlet.java
new file mode 100644
index 00000000..f314a9fa
--- /dev/null
+++ b/subprojects/language-web/src/main/java/tools/refinery/language/web/config/BackendConfigServlet.java
@@ -0,0 +1,39 @@
+package tools.refinery.language.web.config;
+
+import com.google.gson.Gson;
+import jakarta.servlet.ServletConfig;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.eclipse.jetty.http.HttpStatus;
+
+import java.io.IOException;
+
+public class BackendConfigServlet extends HttpServlet {
+        public static final String WEBSOCKET_URL_INIT_PARAM = "tools.refinery.language.web.config.BackendConfigServlet" +
+                        ".webSocketUrl";
+
+        private String serializedConfig;
+
+        @Override
+        public void init(ServletConfig config) throws ServletException {
+                super.init(config);
+                var webSocketUrl = config.getInitParameter(WEBSOCKET_URL_INIT_PARAM);
+                if (webSocketUrl == null) {
+                        throw new IllegalArgumentException("Init parameter " + WEBSOCKET_URL_INIT_PARAM + " is mandatory");
+                }
+                var backendConfig = new BackendConfig(webSocketUrl);
+                var gson = new Gson();
+                serializedConfig = gson.toJson(backendConfig);
+        }
+
+        @Override
+        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+                resp.setStatus(HttpStatus.OK_200);
+                resp.setContentType("application/json");
+                var writer = resp.getWriter();
+                writer.write(serializedConfig);
+                writer.flush();
+        }
+}