feat: static file server

this lets you host web apps out of
:9993/app/{app_name}
:9993/app/{other_app}

from $ZT_HOME/app/{app_name}

controller/EmbeddedNetworkController.cpp

@@ -875,6 +875,53 @@ void EmbeddedNetworkController::configureHTTPControlPlane(
 	std::string memberListPath = "/controller/network/([0-9a-fA-F]{16})/member";
 	std::string memberListPath2 = "/unstable/controller/network/([0-9a-fA-F]{16})/member";
 	std::string memberPath = "/controller/network/([0-9a-fA-F]{16})/member/([0-9a-fA-F]{10})";
+	std::string appUiPath = "/app";
+
+	std::string homeDir(OSUtils::platformDefaultHomePath());
+	static char appUiDir[16384];
+	sprintf(appUiDir,"%s/%s",homeDir.c_str(),appUiPath.c_str());
+
+
+	//static file server for controller-ui
+	auto ret = s.set_mount_point(appUiPath, appUiDir);
+	if (!ret) {
+		fprintf(stderr, "Mounting app directory failed. Creating it. Path: %s - Dir: %s\n", appUiPath.c_str(), appUiDir);
+		if (!OSUtils::mkdir(appUiDir)) {
+			fprintf(stderr, "Could not create app directory either. Path: %s - Dir: %s\n", appUiPath.c_str(), appUiDir);
+		} else {
+			ret = s.set_mount_point(appUiPath, appUiDir);
+			if (!ret) {
+				fprintf(stderr, "Really could not create and mount directory. Path: %s - Dir: %s\nWeb apps won't work.\n", appUiPath.c_str(), appUiDir);
+			}
+		}
+	} else {
+		// fallback to index.html for unknown paths/files
+		s.Get(appUiPath + R"(/(\w+)/(.*))", [&](const httplib::Request& req, httplib::Response& res) {
+			auto match = req.matches[1];
+			if (match.matched) {
+				char indexHtmlPath[16384];
+				sprintf(indexHtmlPath,"%s/%s/%s", appUiDir, match.str().c_str(), "index.html");
+
+				std::string indexHtml;
+
+				if (!OSUtils::readFile(indexHtmlPath, indexHtml)) {
+					res.status = 500;
+					return;
+				}
+
+				res.set_content(indexHtml.c_str(), "text/html");
+			} else {
+				res.status = 500;
+				return;
+			}
+		});
+
+		// auto fix no trailing slash by redirecting
+		s.Get(appUiPath + R"(/(\w+))", [&](const httplib::Request& req, httplib::Response& res) {
+			res.status = 301;
+			res.set_header("location", req.path + "/");
+		});
+	}
 
 	auto controllerGet = [&, setContent](const httplib::Request &req, httplib::Response &res) {
 		char tmp[4096];
@@ -887,11 +934,11 @@ void EmbeddedNetworkController::configureHTTPControlPlane(
 			(unsigned long long)OSUtils::now(),
 			dbOk ? "true" : "false");
 
-			if (!dbOk) {
-				res.status = 503;
-			}
+		if (!dbOk) {
+			res.status = 503;
+		}
 
-			setContent(req, res, tmp);
+		setContent(req, res, tmp);
 	};
 	s.Get(controllerPath, controllerGet);
 	sv6.Get(controllerPath, controllerGet);

service/OneService.cpp

@@ -1597,6 +1597,9 @@ class OneServiceImpl : public OneService
 				setContent(req, res, "{}");
 				res.status = 401;
 				return httplib::Server::HandlerResponse::Handled;
+			// Web Apps base path
+			} else if (req.path.rfind("/app", 0) == 0) { //starts with /app
+				return httplib::Server::HandlerResponse::Unhandled;
 			} else {
 				std::string r = req.remote_addr;
 				InetAddress remoteAddr(r.c_str());