refactoring code

src/main/java/de/srsoftware/widerhall/Util.java

@@ -1,9 +1,12 @@
 package de.srsoftware.widerhall;
 
 import de.srsoftware.tools.translations.Translation;
+import de.srsoftware.widerhall.data.MailingList;
+import de.srsoftware.widerhall.data.User;
 
 import javax.mail.internet.AddressException;
 import javax.mail.internet.InternetAddress;
+import javax.servlet.http.HttpServletRequest;
 import java.net.URLEncoder;
 import java.nio.charset.StandardCharsets;
 import java.security.MessageDigest;
@@ -11,6 +14,8 @@ import java.security.NoSuchAlgorithmException;
 import java.util.Map;
 import java.util.stream.Collectors;
 
+import static de.srsoftware.widerhall.Constants.*;
+
 public class Util {
 
     private static final MessageDigest SHA256 = getSha256();
@@ -92,4 +97,21 @@ public class Util {
         }
         return value;
     }
+
+    public static User getUser(HttpServletRequest req) {
+        var o = req.getSession().getAttribute(USER);
+        return o instanceof User ? (User) o : null;
+    }
+
+    public static String getPath(HttpServletRequest req) {
+        var path = req.getPathInfo();
+        return path == null ? INDEX : path.substring(1);
+
+    }
+
+    public static MailingList getMailingList(HttpServletRequest req) {
+        var listEmail = req.getParameter(LIST);
+        if (listEmail == null || listEmail.isBlank()) return null;
+        return MailingList.load(listEmail);
+    }
 }