use nio.Files.createTempFile rather than File.createTempFile

src/main/org/apache/tools/ant/util/FileUtils.java

@@ -36,9 +36,14 @@
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.nio.file.StandardOpenOption;
+import java.nio.file.attribute.FileAttribute;
+import java.nio.file.attribute.PosixFileAttributeView;
+import java.nio.file.attribute.PosixFilePermission;
+import java.nio.file.attribute.PosixFilePermissions;
 import java.text.DecimalFormat;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.EnumSet;
 import java.util.List;
 import java.util.Locale;
 import java.util.Optional;
@@ -100,6 +105,13 @@ public class FileUtils {
      */
     public static final long NTFS_FILE_TIMESTAMP_GRANULARITY = 1;
 
+    private static final FileAttribute[] TMPFILE_ATTRIBUTES =
+        new FileAttribute[] {
+            PosixFilePermissions.asFileAttribute(EnumSet.of(PosixFilePermission.OWNER_READ,
+                PosixFilePermission.OWNER_WRITE))
+        };
+    private static final FileAttribute[] NO_TMPFILE_ATTRIBUTES = new FileAttribute[0];
+
     /**
      * A one item cache for fromUri.
      * fromUri is called for each element when parsing ant build
@@ -893,6 +905,10 @@ public String toVMSPath(File f) {
      * yield a different file name.
      * </p>
      *
+     * <p>If the filesystem where the temporary file is created
+     * supports POSIX permissions, the file will only be readable and
+     * writable by the current user.</p>
+     *
      * @param prefix file name prefix.
      * @param suffix
      *            file extension; include the '.'.
@@ -916,6 +932,10 @@ public File createTempFile(String prefix, String suffix, File parentDir) {
      * exist before this method was invoked, any subsequent invocation
      * of this method will yield a different file name.</p>
      *
+     * <p>If the filesystem where the temporary file is created
+     * supports POSIX permissions, the file will only be readable and
+     * writable by the current user.</p>
+     *
      * @param prefix file name prefix.
      * @param suffix file extension; include the '.'.
      * @param parentDir Directory to create the temporary file in;
@@ -947,6 +967,10 @@ public File createTempFile(String prefix, String suffix, File parentDir,
      * exist before this method was invoked, any subsequent invocation
      * of this method will yield a different file name.</p>
      *
+     * <p>If the filesystem where the temporary file is created
+     * supports POSIX permissions, the file will only be readable and
+     * writable by the current user.</p>
+     *
      * @param project reference to the current Ant project.
      * @param prefix file name prefix.
      * @param suffix file extension; include the '.'.
@@ -984,7 +1008,12 @@ public File createTempFile(final Project project, String prefix, String suffix,
 
         if (createFile) {
             try {
-                result = File.createTempFile(prefix, suffix, new File(parent));
+                final Path parentPath = new File(parent).toPath();
+                final PosixFileAttributeView parentPosixAttributes =
+                    Files.getFileAttributeView(parentPath, PosixFileAttributeView.class);
+                result = Files.createTempFile(parentPath, prefix, suffix,
+                    parentPosixAttributes != null ? TMPFILE_ATTRIBUTES : NO_TMPFILE_ATTRIBUTES)
+                    .toFile();
             } catch (IOException e) {
                 throw new BuildException("Could not create tempfile in "
                         + parent, e);
@@ -1015,6 +1044,10 @@ public File createTempFile(final Project project, String prefix, String suffix,
      * yield a different file name.
      * </p>
      *
+     * <p>If the filesystem where the temporary file is created
+     * supports POSIX permissions, the file will only be readable and
+     * writable by the current user.</p>
+     *
      * @param prefix file name prefix.
      * @param suffix
      *            file extension; include the '.'.

src/tests/junit/org/apache/tools/ant/util/FileUtilsTest.java

@@ -24,8 +24,11 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.nio.file.attribute.PosixFileAttributeView;
+import java.nio.file.attribute.PosixFilePermission;
 import java.util.Locale;
 import java.util.Optional;
+import java.util.Set;
 
 import org.apache.tools.ant.BuildException;
 import org.apache.tools.ant.MagicTestNames;
@@ -40,7 +43,9 @@
 import static org.apache.tools.ant.util.FileUtils.getFileUtils;
 import static org.apache.tools.ant.util.FileUtils.isCaseSensitiveFileSystem;
 import static org.apache.tools.ant.util.FileUtils.isContextRelativePath;
+import static org.hamcrest.Matchers.containsInAnyOrder;
 import static org.hamcrest.Matchers.endsWith;
+import static org.hamcrest.Matchers.hasSize;
 import static org.hamcrest.Matchers.startsWith;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -370,6 +375,14 @@ public void testCreateTempFile() throws IOException {
         assertTrue("File was created", tmp1.exists());
         assertEquals((new File(tmploc, tmp1.getName())).getAbsolutePath(),
                 tmp1.getAbsolutePath());
+        final PosixFileAttributeView attributes =
+            Files.getFileAttributeView(tmp1.toPath(), PosixFileAttributeView.class);
+        if (attributes != null) {
+            final Set<PosixFilePermission> perm = attributes.readAttributes().permissions();
+            assertThat(perm,
+                containsInAnyOrder(PosixFilePermission.OWNER_READ, PosixFilePermission.OWNER_WRITE));
+            assertThat(perm, hasSize(2));
+        }
         tmp1.delete();
 
         // null parent dir, project without magic property