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<?php
/**
* An implementation of Automattic\Jetpack\Sync\Codec_Interface that uses gzip's DEFLATE
* algorithm to compress objects serialized using json_encode.
*
* @package automattic/jetpack-sync
*/
namespace Automattic\Jetpack\Sync;
use Automattic\Jetpack\Sync\Codec_Interface;
/**
* An implementation of Automattic\Jetpack\Sync\Codec_Interface that uses gzip's DEFLATE
* algorithm to compress objects serialized using json_encode
*/
class JSON_Deflate_Array_Codec implements Codec_Interface {
const CODEC_NAME = 'deflate-json-array';
/**
* Return the name of the codec.
*
* @return string
*/
public function name() {
return self::CODEC_NAME;
}
/**
* Encodes an object.
*
* @param object $object Item to encode.
* @return string
*/
public function encode( $object ) {
return base64_encode( gzdeflate( $this->json_serialize( $object ) ) ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
}
/**
* Decode compressed serialized value.
*
* @param string $input Item to decode.
* @return array|mixed|object
*/
public function decode( $input ) {
return $this->json_unserialize( gzinflate( base64_decode( $input ) ) ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_decode
}
/**
* Serialize JSON
*
* @see https://gist.github.com/muhqu/820694
*
* @param string $any Value to serialize and wrap.
*
* @return false|string
*/
protected function json_serialize( $any ) {
if ( function_exists( 'jetpack_json_wrap' ) ) {
return wp_json_encode( jetpack_json_wrap( $any ) );
}
// This prevents fatal error when updating pre 6.0 via the cli command.
return wp_json_encode( $this->json_wrap( $any ) );
}
/**
* Unserialize JSON
*
* @param string $str JSON string.
* @return array|object Unwrapped JSON.
*/
protected function json_unserialize( $str ) {
return $this->json_unwrap( json_decode( $str, true ) );
}
/**
* Wraps JSON
*
* @param object|array $any Wrapping value.
* @param array $seen_nodes Seen nodes.
* @return array
*/
private function json_wrap( &$any, $seen_nodes = array() ) {
if ( is_object( $any ) ) {
$input = get_object_vars( $any );
$input['__o'] = 1;
} else {
$input = &$any;
}
if ( is_array( $input ) ) {
$seen_nodes[] = &$any;
$return = array();
foreach ( $input as $k => &$v ) {
if ( ( is_array( $v ) || is_object( $v ) ) ) {
if ( in_array( $v, $seen_nodes, true ) ) {
continue;
}
$return[ $k ] = $this->json_wrap( $v, $seen_nodes );
} else {
$return[ $k ] = $v;
}
}
return $return;
}
return $any;
}
/**
* Unwraps a json_decode return.
*
* @param array|object $any json_decode object.
* @return array|object
*/
private function json_unwrap( $any ) {
if ( is_array( $any ) ) {
foreach ( $any as $k => $v ) {
if ( '__o' === $k ) {
continue;
}
$any[ $k ] = $this->json_unwrap( $v );
}
if ( isset( $any['__o'] ) ) {
unset( $any['__o'] );
$any = (object) $any;
}
}
return $any;
}
}
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