[apache#5932] improve(CLI): Fix the CLI delete the anonymous user

Fix the CLI  delete the anonymous user

clients/cli/src/main/java/org/apache/gravitino/cli/AreYouSure.java

@@ -32,20 +32,34 @@ public class AreYouSure {
    * @return {@code true} if the action is to continue {@code false} otherwise.
    */
   public static boolean really(boolean force) {
+    return really(
+        force,
+        "This command could result in data loss or other issues. Are you sure you want to do this? "
+            + "(Y/N)");
+  }
+
+  /**
+   * Prompts the user with a confirmation message to confirm an action.
+   *
+   * @param force if {@code true}, skips user confirmation and proceeds.
+   * @param message the confirmation message to display to the user.
+   * @return {@code true} if the action is to continue {@code false} otherwise.
+   */
+  public static boolean really(boolean force, String message) {
     /* force option for scripting */
     if (force) {
       return true;
     }
 
     try (Scanner scanner = new Scanner(System.in, StandardCharsets.UTF_8.name())) {
-      System.out.println(
-          "This command could result in data loss or other issues. Are you sure you want to do this? (Y/N)");
+      System.out.println(message);
       String answer = scanner.next();
       return "Y".equals(answer);
     } catch (Exception e) {
       System.err.println("Error while reading user input: " + e.getMessage());
       Main.exit(-1);
     }
+
     return false;
   }
 }

clients/cli/src/main/java/org/apache/gravitino/cli/commands/DeleteUser.java

@@ -53,7 +53,14 @@ public DeleteUser(
   public void handle() {
     boolean deleted = false;
 
-    if (!AreYouSure.really(force)) {
+    boolean shouldProceed =
+        "anonymous".equalsIgnoreCase(user)
+            ? AreYouSure.really(
+                false,
+                "Are you sure you want to delete the anonymous user? This will cause unexpected behavior.")
+            : AreYouSure.really(force);
+
+    if (!shouldProceed) {
       return;
     }
 

clients/cli/src/test/java/org/apache/gravitino/cli/TestAreYouSure.java

@@ -20,12 +20,38 @@
 package org.apache.gravitino.cli;
 
 import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
 import java.nio.charset.StandardCharsets;
+import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 public class TestAreYouSure {
 
+  private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
+  private final ByteArrayOutputStream errContent = new ByteArrayOutputStream();
+  private final PrintStream originalOut = System.out;
+  private final PrintStream originalErr = System.err;
+
+  @BeforeEach
+  void setUp() {
+    System.setOut(new PrintStream(outContent));
+    System.setErr(new PrintStream(errContent));
+  }
+
+  @AfterEach
+  void restoreExitFlg() {
+    Main.useExit = true;
+  }
+
+  @AfterEach
+  public void restoreStreams() {
+    System.setOut(originalOut);
+    System.setErr(originalErr);
+  }
+
   @Test
   void testCommandWithForce() {
     Assertions.assertTrue(AreYouSure.really(true));
@@ -57,4 +83,15 @@ void testCommandWithInputInvalid() {
 
     Assertions.assertFalse(AreYouSure.really(false));
   }
+
+  @Test
+  void testCommandWithInputMessage() {
+    ByteArrayInputStream inputStream =
+        new ByteArrayInputStream("Y".getBytes(StandardCharsets.UTF_8));
+    System.setIn(inputStream);
+
+    Assertions.assertTrue(AreYouSure.really(false, "output information"));
+    String output = new String(outContent.toByteArray(), StandardCharsets.UTF_8).trim();
+    Assertions.assertEquals("output information", output);
+  }
 }