gateway: httpgateway: Add exception handler

Something at some point changed so this becomes necessar

gateway/httpgateway.cpp

@@ -34,6 +34,15 @@ bool HttpGateway::keepReading()
 
 Request HttpGateway::convertRequest(httplib::Request request)
 {
+
+	for(auto &c : request.target)
+	{
+		if( !(c >= ' ' && c <= '~'))
+		{
+			throw std::runtime_error("Invalid chars in URI: " + utils::catv(request.target));
+		}
+	}
+
 	Request result;
 	result.setRequestMethod(request.method);
 	result.setUrl(request.target);
@@ -82,6 +91,26 @@ httplib::Response HttpGateway::convertResponse(Response response)
 void HttpGateway::work(RequestWorker &worker)
 {
 	httplib::Server server;
+	server.set_exception_handler([](const httplib::Request& req, httplib::Response& res, std::exception_ptr ep) {
+		auto fmt = "<h1>Error 500</h1><p>%s</p>";
+		char buf[BUFSIZ];
+		try
+		{
+			std::rethrow_exception(ep);
+		}
+		catch (std::exception &e)
+		{
+			snprintf(buf, sizeof(buf), fmt, e.what());
+			Logger::error() << "Exception caught in Httpgateway::work():" << utils::catv(e.what());
+		}
+		catch (...)
+		{
+			snprintf(buf, sizeof(buf), fmt, "Unknown Exception");
+			Logger::error() << "Unknown exception caught in Httpgateway::work()";
+		}
+		res.set_content(buf, "text/html");
+		res.status = 500;
+	});
 	server.set_payload_max_length(this->maxPayloadLength);
 	auto handler = [&](const httplib::Request &req, httplib::Response &res)
 	{
@@ -94,4 +123,5 @@ void HttpGateway::work(RequestWorker &worker)
 	server.Get("/(.*)", handler);
 	server.Post("/(.*)", handler);
 	server.listen(this->listenaddr.c_str(), this->listenport);
+
 }