Package dev.blaauwendraad.masker.json.util

Class ValueMaskingUtil

java.lang.Object

dev.blaauwendraad.masker.json.util.ValueMaskingUtil

public final class ValueMaskingUtil
extends Object

Class containing utility methods to replace a particular target value with a mask. This can be used for length obfuscation and ignoring escaping characters in string values.

Method Summary

Modifier and Type	Method	Description
static void	flushReplacementOperations(MaskingState maskingState)	Performs all replacement operations to the message array, must be called at the end of the replacements.
static void	replaceTargetValueWith(MaskingState maskingState, int targetValueLength, byte[] mask, int maskRepeat)	Replaces a target value (byte slice) with a mask byte.

Methods inherited from class java.lang.Object

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

Method Details

replaceTargetValueWith

public static void replaceTargetValueWith(MaskingState maskingState,
 int targetValueLength,
 byte[] mask,
 int maskRepeat)

Replaces a target value (byte slice) with a mask byte. If lengths of both target value and mask are equal, the replacement is done in-place, otherwise a replacement operation is recorded to be performed as a batch using flushReplacementOperations(dev.blaauwendraad.masker.json.MaskingState).

Parameters:

maskingState - the masking state

targetValueLength - the length of the target value slice.

mask - the bytes to replace the value slice with.

flushReplacementOperations

public static void flushReplacementOperations(MaskingState maskingState)

Performs all replacement operations to the message array, must be called at the end of the replacements.

For every operation that required resizing of the original array, to avoid copying the array multiple times, those operations were stored in a list and can be performed in one go, thus resizing the array only once.

Replacement operation is only recorded if the length of the target value is different from the length of the mask, otherwise the replacement must have been done in-place.

Parameters:

maskingState - the current state of the JsonMasker instance.