reimplement custom css feature

src/main/java/com/commafeed/frontend/servlet/CustomCssServlet.java

@@ -0,0 +1,47 @@
+package com.commafeed.frontend.servlet;
+
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import lombok.RequiredArgsConstructor;
+
+import org.hibernate.SessionFactory;
+
+import com.commafeed.CommaFeedApplication;
+import com.commafeed.CommaFeedConfiguration;
+import com.commafeed.backend.dao.UnitOfWork;
+import com.commafeed.backend.dao.UserSettingsDAO;
+import com.commafeed.backend.model.User;
+import com.commafeed.backend.model.UserSettings;
+
+@SuppressWarnings("serial")
+@RequiredArgsConstructor
+public class CustomCssServlet extends HttpServlet {
+
+	private final SessionFactory sessionFactory;
+	private final UserSettingsDAO userSettingsDAO;
+	private final CommaFeedConfiguration config;
+
+	@Override
+	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+		final User user = (User) req.getSession().getAttribute(CommaFeedApplication.SESSION_USER);
+		if (user == null) {
+			resp.sendRedirect(resp.encodeRedirectURL(config.getApplicationSettings().getPublicUrl()));
+			return;
+		}
+
+		UserSettings settings = new UnitOfWork<UserSettings>(sessionFactory) {
+			@Override
+			protected UserSettings runInSession() {
+				return userSettingsDAO.findByUser(user);
+			}
+		}.run();
+
+		resp.setContentType("text/css");
+		resp.getWriter().write(settings.getCustomCss());
+	}
+}