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<?php
declare(strict_types=1);
namespace DG;
use DG\BypassFinals\MutatingWrapper;
use DG\BypassFinals\NativeWrapper;
/**
* Removes keyword final & readonly from source codes.
*/
final class BypassFinals
{
/** @var array */
private static $pathWhitelist = ['*'];
/** @var ?string */
private static $cacheDir;
/** @var array */
private static $tokens = [];
public static function enable(bool $bypassReadOnly = true, bool $bypassFinal = true): void
{
if ($bypassReadOnly && PHP_VERSION_ID >= 80100) {
self::$tokens[T_READONLY] = 'readonly';
}
if ($bypassFinal) {
self::$tokens[T_FINAL] = 'final';
}
$wrapper = stream_get_meta_data(fopen(__FILE__, 'r'))['wrapper_data'] ?? null;
if ($wrapper instanceof MutatingWrapper) {
return;
}
MutatingWrapper::$underlyingWrapperClass = $wrapper
? get_class($wrapper)
: NativeWrapper::class;
stream_wrapper_unregister(NativeWrapper::Protocol);
stream_wrapper_register(NativeWrapper::Protocol, MutatingWrapper::class);
}
public static function setWhitelist(array $whitelist): void
{
foreach ($whitelist as &$mask) {
$mask = strtr($mask, '\\', '/');
}
self::$pathWhitelist = $whitelist;
}
public static function setCacheDirectory(?string $dir): void
{
self::$cacheDir = $dir;
}
/** @internal */
public static function modifyCode(string $code): string
{
foreach (self::$tokens as $text) {
if (stripos($code, $text) !== false) {
return self::$cacheDir
? self::removeTokensCached($code)
: self::removeTokens($code);
}
}
return $code;
}
private static function removeTokensCached(string $code): string
{
$wrapper = new NativeWrapper;
$hash = sha1($code . implode(',', self::$tokens));
if (@$wrapper->stream_open(self::$cacheDir . '/' . $hash, 'r')) { // @ may not exist
flock($wrapper->handle, LOCK_SH);
if ($res = stream_get_contents($wrapper->handle)) {
return $res;
}
}
$code = self::removeTokens($code);
if (@$wrapper->stream_open(self::$cacheDir . '/' . $hash, 'x')) { // @ may exist
flock($wrapper->handle, LOCK_EX);
fwrite($wrapper->handle, $code);
}
return $code;
}
private static function removeTokens(string $code): string
{
try {
$tokens = token_get_all($code, TOKEN_PARSE);
} catch (\ParseError $e) {
return $code;
}
$code = '';
foreach ($tokens as $token) {
$code .= is_array($token)
? (isset(self::$tokens[$token[0]]) ? '' : $token[1])
: $token;
}
return $code;
}
/** @internal */
public static function isPathInWhiteList(string $path): bool
{
$path = strtr($path, '\\', '/');
foreach (self::$pathWhitelist as $mask) {
if (fnmatch($mask, $path)) {
return true;
}
}
return false;
}
}