io.strimzi.kafka.oauth.common

Class IOUtil

java.lang.Object

io.strimzi.kafka.oauth.common.IOUtil

public class IOUtil
extends java.lang.Object

A helper class that contains commonly used methods for I/O operations

Constructor Summary

Constructors

Constructor and Description
IOUtil()

Method Summary

Modifier and Type	Method and Description
static java.lang.String	asHexString(byte[] bytes) Convert a byte array into a hexadecimal string
static void	copy(java.io.InputStream input, java.io.OutputStream output) Copy the content of specified InputStream into the specified OutputStream
static long	crc32(java.lang.String content) Calculate a CRC32 for the specified String
static java.lang.String	hashForObjects(java.lang.Object... args) Generate a predictable (deterministic) hash string of length 8 for an array of objects
static boolean	isFileAccessLimitedToOwner(java.nio.file.Path file) Check that there are minimal permissions on the file (owner access only)
static java.lang.String	randomHexString() Generate a random 8 character string of hexadecimal digits
static java.lang.String	randomHexString(int length) Generate a random string of hexadecimal digits of the specified length

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IOUtil

public IOUtil()

Method Detail

copy

public static void copy(java.io.InputStream input,
                        java.io.OutputStream output)
                 throws java.io.IOException

Copy the content of specified InputStream into the specified OutputStream

Parameters:

input - The input stream to read from

output - The output stream to write to

Throws:

java.io.IOException - an exception if the copy operation fails

randomHexString

public static java.lang.String randomHexString()

Generate a random 8 character string of hexadecimal digits

Returns:

a hexadecimal String of length 8

randomHexString

public static java.lang.String randomHexString(int length)

Generate a random string of hexadecimal digits of the specified length

Parameters:

length - The length of the resulting string

Returns:

a hexadecimal String of the specified length

asHexString

public static java.lang.String asHexString(byte[] bytes)

Convert a byte array into a hexadecimal string

Parameters:

bytes - A byte array

Returns:

a hexadecimal string

hashForObjects

public static java.lang.String hashForObjects(java.lang.Object... args)

Generate a predictable (deterministic) hash string of length 8 for an array of objects

Parameters:

args - The objects to take as input for the calculation

Returns:

a hash string of length 8

crc32

public static long crc32(java.lang.String content)

Calculate a CRC32 for the specified String

Parameters:

content - The input string

Returns:

CRC32 as long value

isFileAccessLimitedToOwner

public static boolean isFileAccessLimitedToOwner(java.nio.file.Path file)
                                          throws java.io.IOException

Check that there are minimal permissions on the file (owner access only)

In POSIX compatible environment there should be no permissions for group and other users. In ACL compatible environment there should be no permissions for anyone other than current user, Administrators or SYSTEM.

Parameters:

file - Path object representing an existing file to check file permissions for

Returns:

true if file permissions limit access to this file to the owner

Throws:

java.lang.IllegalArgumentException - if file doesn't exist or is not a regular file (not a directory)

java.lang.UnsupportedOperationException - if filesystem doesn't support POSIX or ACL file permissions

java.io.IOException - if an I/O error occurs