move session related classes to subpackage

src/main/java/com/commafeed/frontend/session/SessionHelper.java

@@ -0,0 +1,39 @@
+package com.commafeed.frontend.session;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpSession;
+
+import lombok.RequiredArgsConstructor;
+
+import com.commafeed.backend.model.User;
+import com.google.common.base.Optional;
+
+@RequiredArgsConstructor()
+public class SessionHelper {
+	
+	private static final String SESSION_KEY_USER = "user";
+	
+	private final HttpServletRequest request;
+	
+	public Optional<User> getLoggedInUser() {
+		Optional<HttpSession> session = getSession(false);
+		
+		if (session.isPresent()) {
+			User user = (User) session.get().getAttribute(SESSION_KEY_USER);
+			return Optional.fromNullable(user);
+		}
+		
+		return Optional.absent();
+	}
+	
+	public void setLoggedInUser(User user) {
+		Optional<HttpSession> session = getSession(true);
+		session.get().setAttribute(SESSION_KEY_USER, user);
+	}
+	
+	private Optional<HttpSession> getSession(boolean force) {
+		HttpSession session = request.getSession(force);
+		return Optional.fromNullable(session);
+	}
+
+}