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Micro Distribution of the Payara Project

There is a newer version: 7.2024.1.Alpha1

// Portions Copyright [2016-2019] [Payara Foundation and/or affiliates]

package org.glassfish.security.common;

import static java.nio.file.Files.getFileAttributeView;
import static java.nio.file.Files.setPosixFilePermissions;
import static java.nio.file.attribute.PosixFilePermission.OWNER_READ;
import static java.nio.file.attribute.PosixFilePermission.OWNER_WRITE;

import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.attribute.PosixFileAttributeView;
import java.util.EnumSet;

/**
 * Provides common functionality for protecting files.
 *
 * @author Phillip Ross
 */
public class FileProtectionUtility {
    
    private FileProtectionUtility() {}

    /**
     * Set permissions on the specified file equivalent to file mode 0600.
     *
     * NOTE: This method will only set permissions on files that exist on filesystems which support POSIX file permissions.
     * Manipulation of permissions is silently skipped for filesystems that do not support POSIX file permissions (such as
     * Windows NTFS).
     *
     * @param file The file to set permissions on
     * @throws IOException if an I/O error occurs
     */
    public static void chmod0600(File file) throws IOException {
        Path filePath = file.toPath();
        
        PosixFileAttributeView posixFileAttributeView = getFileAttributeView(filePath, PosixFileAttributeView.class);
        if (posixFileAttributeView != null) {
            setPosixFilePermissions(filePath, EnumSet.of(OWNER_READ, OWNER_WRITE));
        }
    }

}