nextcloud/lib/private/app/codecheckvisitor.php

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<?php
/**
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* @author Morris Jobke <hey@morrisjobke.de>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @copyright Copyright (c) 2015, ownCloud, Inc.
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\App;
use PhpParser\Node;
use PhpParser\Node\Name;
use PhpParser\NodeVisitorAbstract;
class CodeCheckVisitor extends NodeVisitorAbstract {
public function __construct($blackListedClassNames) {
$this->blackListedClassNames = array_map('strtolower', $blackListedClassNames);
}
public $errors = [];
public function enterNode(Node $node) {
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if ($node instanceof Node\Expr\BinaryOp\Equal) {
$this->errors[]= [
'disallowedToken' => '==',
'errorCode' => CodeChecker::OP_OPERATOR_USAGE_DISCOURAGED,
'line' => $node->getLine(),
'reason' => $this->buildReason('==', CodeChecker::OP_OPERATOR_USAGE_DISCOURAGED)
];
}
if ($node instanceof Node\Expr\BinaryOp\NotEqual) {
$this->errors[]= [
'disallowedToken' => '!=',
'errorCode' => CodeChecker::OP_OPERATOR_USAGE_DISCOURAGED,
'line' => $node->getLine(),
'reason' => $this->buildReason('!=', CodeChecker::OP_OPERATOR_USAGE_DISCOURAGED)
];
}
if ($node instanceof Node\Stmt\Class_) {
if (!is_null($node->extends)) {
$this->checkBlackList($node->extends->toString(), CodeChecker::CLASS_EXTENDS_NOT_ALLOWED, $node);
}
foreach ($node->implements as $implements) {
$this->checkBlackList($implements->toString(), CodeChecker::CLASS_IMPLEMENTS_NOT_ALLOWED, $node);
}
}
if ($node instanceof Node\Expr\StaticCall) {
if (!is_null($node->class)) {
if ($node->class instanceof Name) {
$this->checkBlackList($node->class->toString(), CodeChecker::STATIC_CALL_NOT_ALLOWED, $node);
}
if ($node->class instanceof Node\Expr\Variable) {
/**
* TODO: find a way to detect something like this:
* $c = "OC_API";
* $n = $i::call();
*/
}
}
}
if ($node instanceof Node\Expr\ClassConstFetch) {
if (!is_null($node->class)) {
if ($node->class instanceof Name) {
$this->checkBlackList($node->class->toString(), CodeChecker::CLASS_CONST_FETCH_NOT_ALLOWED, $node);
}
if ($node->class instanceof Node\Expr\Variable) {
/**
* TODO: find a way to detect something like this:
* $c = "OC_API";
* $n = $i::ADMIN_AUTH;
*/
}
}
}
if ($node instanceof Node\Expr\New_) {
if (!is_null($node->class)) {
if ($node->class instanceof Name) {
$this->checkBlackList($node->class->toString(), CodeChecker::CLASS_NEW_FETCH_NOT_ALLOWED, $node);
}
if ($node->class instanceof Node\Expr\Variable) {
/**
* TODO: find a way to detect something like this:
* $c = "OC_API";
* $n = new $i;
*/
}
}
}
}
private function checkBlackList($name, $errorCode, Node $node) {
if (in_array(strtolower($name), $this->blackListedClassNames)) {
$this->errors[]= [
'disallowedToken' => $name,
'errorCode' => $errorCode,
'line' => $node->getLine(),
'reason' => $this->buildReason($name, $errorCode)
];
}
}
private function buildReason($name, $errorCode) {
static $errorMessages= [
CodeChecker::CLASS_EXTENDS_NOT_ALLOWED => "used as base class",
CodeChecker::CLASS_IMPLEMENTS_NOT_ALLOWED => "used as interface",
CodeChecker::STATIC_CALL_NOT_ALLOWED => "static method call on private class",
CodeChecker::CLASS_CONST_FETCH_NOT_ALLOWED => "used to fetch a const from",
CodeChecker::CLASS_NEW_FETCH_NOT_ALLOWED => "is instanciated",
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CodeChecker::OP_OPERATOR_USAGE_DISCOURAGED => "is discouraged"
];
if (isset($errorMessages[$errorCode])) {
return $errorMessages[$errorCode];
}
return "$name usage not allowed - error: $errorCode";
}
}