| /* |
| * Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.nio.file; |
| |
| import java.util.Set; |
| import java.util.EnumSet; |
| import java.security.SecureRandom; |
| import java.io.IOException; |
| import java.nio.file.attribute.FileAttribute; |
| import java.nio.file.attribute.PosixFilePermission; |
| import java.nio.file.attribute.PosixFilePermissions; |
| import static java.nio.file.attribute.PosixFilePermission.*; |
| import sun.security.action.GetPropertyAction; |
| |
| |
| /** |
| * Helper class to support creation of temporary files and directories with |
| * initial attributes. |
| */ |
| |
| class TempFileHelper { |
| private TempFileHelper() { } |
| |
| // temporary directory location |
| private static final Path tmpdir = |
| Paths.get(GetPropertyAction.getProperty("java.io.tmpdir")); |
| |
| private static final boolean isPosix = |
| FileSystems.getDefault().supportedFileAttributeViews().contains("posix"); |
| |
| // file name generation, same as java.io.File for now |
| private static final SecureRandom random = new SecureRandom(); |
| private static Path generatePath(String prefix, String suffix, Path dir) { |
| long n = random.nextLong(); |
| n = (n == Long.MIN_VALUE) ? 0 : Math.abs(n); |
| Path name = dir.getFileSystem().getPath(prefix + Long.toString(n) + suffix); |
| // the generated name should be a simple file name |
| if (name.getParent() != null) |
| throw new IllegalArgumentException("Invalid prefix or suffix"); |
| return dir.resolve(name); |
| } |
| |
| // default file and directory permissions (lazily initialized) |
| private static class PosixPermissions { |
| static final FileAttribute<Set<PosixFilePermission>> filePermissions = |
| PosixFilePermissions.asFileAttribute(EnumSet.of(OWNER_READ, OWNER_WRITE)); |
| static final FileAttribute<Set<PosixFilePermission>> dirPermissions = |
| PosixFilePermissions.asFileAttribute(EnumSet |
| .of(OWNER_READ, OWNER_WRITE, OWNER_EXECUTE)); |
| } |
| |
| /** |
| * Creates a file or directory in the given directory (or in the |
| * temporary directory if dir is {@code null}). |
| */ |
| private static Path create(Path dir, |
| String prefix, |
| String suffix, |
| boolean createDirectory, |
| FileAttribute<?>[] attrs) |
| throws IOException |
| { |
| if (prefix == null) |
| prefix = ""; |
| if (suffix == null) |
| suffix = (createDirectory) ? "" : ".tmp"; |
| if (dir == null) |
| dir = tmpdir; |
| |
| // in POSIX environments use default file and directory permissions |
| // if initial permissions not given by caller. |
| if (isPosix && (dir.getFileSystem() == FileSystems.getDefault())) { |
| if (attrs.length == 0) { |
| // no attributes so use default permissions |
| attrs = new FileAttribute<?>[1]; |
| attrs[0] = (createDirectory) ? PosixPermissions.dirPermissions : |
| PosixPermissions.filePermissions; |
| } else { |
| // check if posix permissions given; if not use default |
| boolean hasPermissions = false; |
| for (int i=0; i<attrs.length; i++) { |
| if (attrs[i].name().equals("posix:permissions")) { |
| hasPermissions = true; |
| break; |
| } |
| } |
| if (!hasPermissions) { |
| FileAttribute<?>[] copy = new FileAttribute<?>[attrs.length+1]; |
| System.arraycopy(attrs, 0, copy, 0, attrs.length); |
| attrs = copy; |
| attrs[attrs.length-1] = (createDirectory) ? |
| PosixPermissions.dirPermissions : |
| PosixPermissions.filePermissions; |
| } |
| } |
| } |
| |
| // loop generating random names until file or directory can be created |
| SecurityManager sm = System.getSecurityManager(); |
| for (;;) { |
| Path f; |
| try { |
| f = generatePath(prefix, suffix, dir); |
| } catch (InvalidPathException e) { |
| // don't reveal temporary directory location |
| if (sm != null) |
| throw new IllegalArgumentException("Invalid prefix or suffix"); |
| throw e; |
| } |
| try { |
| if (createDirectory) { |
| return Files.createDirectory(f, attrs); |
| } else { |
| return Files.createFile(f, attrs); |
| } |
| } catch (SecurityException e) { |
| // don't reveal temporary directory location |
| if (dir == tmpdir && sm != null) |
| throw new SecurityException("Unable to create temporary file or directory"); |
| throw e; |
| } catch (FileAlreadyExistsException e) { |
| // ignore |
| } |
| } |
| } |
| |
| /** |
| * Creates a temporary file in the given directory, or in the |
| * temporary directory if dir is {@code null}. |
| */ |
| static Path createTempFile(Path dir, |
| String prefix, |
| String suffix, |
| FileAttribute<?>[] attrs) |
| throws IOException |
| { |
| return create(dir, prefix, suffix, false, attrs); |
| } |
| |
| /** |
| * Creates a temporary directory in the given directory, or in the |
| * temporary directory if dir is {@code null}. |
| */ |
| static Path createTempDirectory(Path dir, |
| String prefix, |
| FileAttribute<?>[] attrs) |
| throws IOException |
| { |
| return create(dir, prefix, null, true, attrs); |
| } |
| } |