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RequirePass.php
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RequirePass.php
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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2023 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Psy\CodeCleaner;
use PhpParser\Node;
use PhpParser\Node\Arg;
use PhpParser\Node\Expr\Include_;
use PhpParser\Node\Expr\StaticCall;
use PhpParser\Node\Name\FullyQualified as FullyQualifiedName;
use PhpParser\Node\Scalar\Int_;
use PhpParser\Node\Scalar\LNumber;
use Psy\Exception\ErrorException;
use Psy\Exception\FatalErrorException;
/**
* Add runtime validation for `require` and `require_once` calls.
*/
class RequirePass extends CodeCleanerPass
{
private const REQUIRE_TYPES = [Include_::TYPE_REQUIRE, Include_::TYPE_REQUIRE_ONCE];
/**
* {@inheritdoc}
*
* @return int|Node|null Replacement node (or special return value)
*/
public function enterNode(Node $origNode)
{
if (!$this->isRequireNode($origNode)) {
return;
}
$node = clone $origNode;
/*
* rewrite
*
* $foo = require $bar
*
* to
*
* $foo = require \Psy\CodeCleaner\RequirePass::resolve($bar)
*/
// @todo Remove LNumber once we drop support for PHP-Parser 4.x
$arg = \class_exists('PhpParser\Node\Scalar\Int_') ?
new Int_($origNode->getStartLine()) :
new LNumber($origNode->getStartLine());
$node->expr = new StaticCall(
new FullyQualifiedName(self::class),
'resolve',
[new Arg($origNode->expr), new Arg($arg)],
$origNode->getAttributes()
);
return $node;
}
/**
* Runtime validation that $file can be resolved as an include path.
*
* If $file can be resolved, return $file. Otherwise throw a fatal error exception.
*
* If $file collides with a path in the currently running PsySH phar, it will be resolved
* relative to the include path, to prevent PHP from grabbing the phar version of the file.
*
* @throws FatalErrorException when unable to resolve include path for $file
* @throws ErrorException if $file is empty and E_WARNING is included in error_reporting level
*
* @param string $file
* @param int $startLine Line number of the original require expression
*
* @return string Exactly the same as $file, unless $file collides with a path in the currently running phar
*/
public static function resolve($file, $startLine = null): string
{
$file = (string) $file;
if ($file === '') {
// @todo Shell::handleError would be better here, because we could
// fake the file and line number, but we can't call it statically.
// So we're duplicating some of the logics here.
if (\E_WARNING & \error_reporting()) {
ErrorException::throwException(\E_WARNING, 'Filename cannot be empty', null, $startLine);
}
// @todo trigger an error as fallback? this is pretty ugly…
// trigger_error('Filename cannot be empty', E_USER_WARNING);
}
$resolvedPath = \stream_resolve_include_path($file);
if ($file === '' || !$resolvedPath) {
$msg = \sprintf("Failed opening required '%s'", $file);
throw new FatalErrorException($msg, 0, \E_ERROR, null, $startLine);
}
// Special case: if the path is not already relative or absolute, and it would resolve to
// something inside the currently running phar (e.g. `vendor/autoload.php`), we'll resolve
// it relative to the include path so PHP won't grab the phar version.
//
// Note that this only works if the phar has `psysh` in the path. We might want to lift this
// restriction and special case paths that would collide with any running phar?
if ($resolvedPath !== $file && $file[0] !== '.') {
$runningPhar = \Phar::running();
if (\strpos($runningPhar, 'psysh') !== false && \is_file($runningPhar.\DIRECTORY_SEPARATOR.$file)) {
foreach (self::getIncludePath() as $prefix) {
$resolvedPath = $prefix.\DIRECTORY_SEPARATOR.$file;
if (\is_file($resolvedPath)) {
return $resolvedPath;
}
}
}
}
return $file;
}
private function isRequireNode(Node $node): bool
{
return $node instanceof Include_ && \in_array($node->type, self::REQUIRE_TYPES);
}
private static function getIncludePath(): array
{
if (\PATH_SEPARATOR === ':') {
return \preg_split('#:(?!//)#', \get_include_path());
}
return \explode(\PATH_SEPARATOR, \get_include_path());
}
}

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