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<?php
use MediaWiki\Storage\BlobAccessException;
class HistoryBlobUtils {
/**
* Get the classes which are allowed to be contained in a text or ES row
*
* @return string[]
*/
public static function getAllowedClasses() {
return [
ConcatenatedGzipHistoryBlob::class,
DiffHistoryBlob::class,
HistoryBlobCurStub::class,
HistoryBlobStub::class
];
}
/**
* Unserialize a HistoryBlob
*
* @param string $str
* @param bool $allowDouble Allow double serialization
* @return HistoryBlob|HistoryBlobStub|HistoryBlobCurStub|null
*/
public static function unserialize( string $str, bool $allowDouble = false ) {
$obj = unserialize( $str, [ 'allowed_classes' => self::getAllowedClasses() ] );
if ( is_string( $obj ) && $allowDouble ) {
// Correct for old double-serialization bug (needed by HistoryBlobStub only)
$obj = unserialize( $obj, [ 'allowed_classes' => self::getAllowedClasses() ] );
}
foreach ( self::getAllowedClasses() as $class ) {
if ( $obj instanceof $class ) {
return $obj;
}
}
return null;
}
/**
* Unserialize array data with no classes
*
* @param string $str
* @return array
*/
public static function unserializeArray( string $str ): array {
$array = unserialize( $str, [ 'allowed_classes' => false ] );
if ( !is_array( $array ) ) {
throw new BlobAccessException( "Expected array in serialized string" );
}
return $array;
}
}
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