/*

 * Copyright 2008-2009 Sun Microsystems, Inc.  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.

 *

 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

import java.nio.file.*;

import static java.nio.file.StandardOpenOption.*;

import java.nio.file.attribute.*;

import java.io.File;

import java.io.IOException;

import java.io.OutputStream;

import java.util.Set;

public class TemporaryFiles {

    static void checkFile(Path file) throws IOException {

        // check file is in temporary directory

        Path tmpdir = Paths.get(System.getProperty("java.io.tmpdir"));

        if (!file.getParent().equals(tmpdir))

            throw new RuntimeException("Not in temporary directory");

        // check that file can be opened for reading and writing

        file.newByteChannel(READ).close();

        file.newByteChannel(WRITE).close();

        file.newByteChannel(READ,WRITE).close();

        // check file permissions are 0600 or more secure

        if (file.getFileStore().supportsFileAttributeView("posix")) {

            Set<PosixFilePermission> perms = Attributes

                .readPosixFileAttributes(file).permissions();

            perms.remove(PosixFilePermission.OWNER_READ);

            perms.remove(PosixFilePermission.OWNER_WRITE);

            if (!perms.isEmpty())

                throw new RuntimeException("Temporary file is not secure");

        }

    }

    public static void main(String[] args) throws IOException {

        Path file = File.createTempFile("blah", null, false).toPath();

        try {

            checkFile(file);

        } finally {

            TestUtil.deleteUnchecked(file);

        }

        // temporary file with deleteOnExit

        file = File.createTempFile("blah", "tmp", true).toPath();

        checkFile(file);

        // write path to temporary file to file so that calling script can

        // check that it is deleted

        OutputStream out = Paths.get(args[0]).newOutputStream();

        try {

            out.write(file.toString().getBytes());

        } finally {

            out.close();

        }

    }

}