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<?php
/*
* This file is part of php-cache organization.
*
* (c) 2015 Aaron Scherer <aequasi@gmail.com>, Tobias Nyholm <tobias.nyholm@gmail.com>
*
* This source file is subject to the MIT license that is bundled
* with this source code in the file LICENSE.
*/
namespace Cache\Adapter\Common;
/**
* This trait provides common routines for safely encoding binary and non-UTF8 data in
* JSON. This is needed for components that use JSON natively (currently, the MongoDB
* adapter and EncryptedCachePool).
*
* @author Stephen Clouse <stephen.clouse@noaa.gov>
*/
trait JsonBinaryArmoring
{
private static $ESCAPE_JSON_CHARACTERS = [
"\x00", "\x01", "\x02", "\x03", "\x04", "\x05", "\x06", "\x07",
"\x08", "\x09", "\x0A", "\x0B", "\x0C", "\x0D", "\x0E", "\x0F",
"\x10", "\x11", "\x12", "\x13", "\x14", "\x15", "\x16", "\x17",
"\x18", "\x19", "\x1A", "\x1B", "\x1C", "\x1D", "\x1E", "\x1F",
];
private static $ENCODED_JSON_CHARACTERS = [
'\u0000', '\u0001', '\u0002', '\u0003', '\u0004', '\u0005', '\u0006', '\u0007',
'\u0008', '\u0009', '\u000A', '\u000B', '\u000C', '\u000D', '\u000E', '\u000F',
'\u0010', '\u0011', '\u0012', '\u0013', '\u0014', '\u0015', '\u0016', '\u0017',
'\u0018', '\u0019', '\u001A', '\u001B', '\u001C', '\u001D', '\u001E', '\u001F',
];
/**
* Armor a value going into a JSON document.
*
* @param string $value
*
* @return string
*/
protected static function jsonArmor($value)
{
return str_replace(
static::$ESCAPE_JSON_CHARACTERS,
static::$ENCODED_JSON_CHARACTERS,
utf8_encode($value)
);
}
/**
* De-armor a value from a JSON document.
*
* @param string $value
*
* @return string
*/
protected static function jsonDeArmor($value)
{
return utf8_decode(str_replace(
static::$ENCODED_JSON_CHARACTERS,
static::$ESCAPE_JSON_CHARACTERS,
$value
));
}
}