[HOTFIX] Validate note name

zeppelin-server/src/main/java/org/apache/zeppelin/service/NotebookService.java

@@ -24,6 +24,7 @@
 import static org.apache.zeppelin.scheduler.Job.Status.ABORT;
 
 import java.io.IOException;
+import java.net.URLDecoder;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.time.Instant;
@@ -236,6 +237,12 @@ String normalizeNotePath(String notePath) throws IOException {
     }
 
     notePath = notePath.replace("\r", " ").replace("\n", " ");
+
+    notePath = URLDecoder.decode(notePath, StandardCharsets.UTF_8.toString());
+    if (notePath.endsWith("/")) {
+      throw new IOException("Note name shouldn't end with '/'");
+    }
+
     int pos = notePath.lastIndexOf("/");
     if ((notePath.length() - pos) > 255) {
       throw new IOException("Note name must be less than 255");

zeppelin-server/src/test/java/org/apache/zeppelin/service/NotebookServiceTest.java

@@ -528,5 +528,17 @@ void testNormalizeNotePath() throws IOException {
     } catch (IOException e) {
       assertEquals("Note name can not contain '..'", e.getMessage());
     }
+    try {
+      notebookService.normalizeNotePath("%2e%2e/%2e%2e/tmp/test222");
+      fail("Should fail");
+    } catch (IOException e) {
+      assertEquals("Note name can not contain '..'", e.getMessage());
+    }
+    try {
+      notebookService.normalizeNotePath("./");
+      fail("Should fail");
+    } catch (IOException e) {
+      assertEquals("Note name shouldn't end with '/'", e.getMessage());
+    }
   }
 }