Merge pull request from GHSA-g3wg-6mcf-8jj6

* Issue #5451 - Improving temp directory creation.

+ Using new Files.createTempDirectory() instead
  of nonsense around File.createTempFile()

Signed-off-by: Joakim Erdfelt <joakim.erdfelt@gmail.com>

* Fixes #5451 - Restoring File.deleteOnExit

jetty-webapp/src/main/java/org/eclipse/jetty/webapp/WebInfConfiguration.java

@@ -24,6 +24,8 @@
 import java.net.URISyntaxException;
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -375,14 +377,10 @@ public void deconfigure(WebAppContext context) throws Exception
     @Override
     public void cloneConfigure(WebAppContext template, WebAppContext context) throws Exception
     {
-        File tmpDir = File.createTempFile(WebInfConfiguration.getCanonicalNameForWebAppTmpDir(context), "", template.getTempDirectory().getParentFile());
-        if (tmpDir.exists())
-        {
-            IO.delete(tmpDir);
-        }
-        tmpDir.mkdir();
-        tmpDir.deleteOnExit();
-        context.setTempDirectory(tmpDir);
+        Path tmpDir = Files.createTempDirectory(template.getTempDirectory().getParentFile().toPath(), WebInfConfiguration.getCanonicalNameForWebAppTmpDir(context));
+        File tmpDirAsFile = tmpDir.toFile();
+        tmpDirAsFile.deleteOnExit();
+        context.setTempDirectory(tmpDirAsFile);
     }
 
     /**
@@ -510,11 +508,7 @@ public void makeTempDirectory(File parent, WebAppContext context)
         else
         {
             //ensure file will always be unique by appending random digits
-            tmpDir = File.createTempFile(temp, ".dir", parent);
-            //delete the file that was created
-            tmpDir.delete();
-            //and make a directory of the same name
-            tmpDir.mkdirs();
+            tmpDir = Files.createTempDirectory(parent.toPath(), temp).toFile();
         }
         configureTempDirectory(tmpDir, context);