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- Veröffentlicht
- 06.01.2017
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Escaper.php
001 <?php
002
003 /*
004 * This file is part of Twig.
005 *
006 * (c) 2009 Fabien Potencier
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 /**
013 * Twig_NodeVisitor_Escaper implements output escaping.
014 *
015 * @author Fabien Potencier <fabien@symfony.com>
016 */
017 class Twig_NodeVisitor_Escaper extends Twig_BaseNodeVisitor
018 {
019 protected $statusStack = array();
020 protected $blocks = array();
021 protected $safeAnalysis;
022 protected $traverser;
023 protected $defaultStrategy = false;
024 protected $safeVars = array();
025
026 public function __construct()
027 {
028 $this->safeAnalysis = new Twig_NodeVisitor_SafeAnalysis();
029 }
030
031 /**
032 * {@inheritdoc}
033 */
034 protected function doEnterNode(Twig_Node $node, Twig_Environment $env)
035 {
036 if ($node instanceof Twig_Node_Module) {
037 if ($env->hasExtension('escaper') && $defaultStrategy = $env->getExtension('escaper')->getDefaultStrategy($node->getAttribute('filename'))) {
038 $this->defaultStrategy = $defaultStrategy;
039 }
040 $this->safeVars = array();
041 $this->blocks = array();
042 } elseif ($node instanceof Twig_Node_AutoEscape) {
043 $this->statusStack[] = $node->getAttribute('value');
044 } elseif ($node instanceof Twig_Node_Block) {
045 $this->statusStack[] = isset($this->blocks[$node->getAttribute('name')]) ? $this->blocks[$node->getAttribute('name')] : $this->needEscaping($env);
046 } elseif ($node instanceof Twig_Node_Import) {
047 $this->safeVars[] = $node->getNode('var')->getAttribute('name');
048 }
049
050 return $node;
051 }
052
053 /**
054 * {@inheritdoc}
055 */
056 protected function doLeaveNode(Twig_Node $node, Twig_Environment $env)
057 {
058 if ($node instanceof Twig_Node_Module) {
059 $this->defaultStrategy = false;
060 $this->safeVars = array();
061 $this->blocks = array();
062 } elseif ($node instanceof Twig_Node_Expression_Filter) {
063 return $this->preEscapeFilterNode($node, $env);
064 } elseif ($node instanceof Twig_Node_Print) {
065 return $this->escapePrintNode($node, $env, $this->needEscaping($env));
066 }
067
068 if ($node instanceof Twig_Node_AutoEscape || $node instanceof Twig_Node_Block) {
069 array_pop($this->statusStack);
070 } elseif ($node instanceof Twig_Node_BlockReference) {
071 $this->blocks[$node->getAttribute('name')] = $this->needEscaping($env);
072 }
073
074 return $node;
075 }
076
077 protected function escapePrintNode(Twig_Node_Print $node, Twig_Environment $env, $type)
078 {
079 if (false === $type) {
080 return $node;
081 }
082
083 $expression = $node->getNode('expr');
084
085 if ($this->isSafeFor($type, $expression, $env)) {
086 return $node;
087 }
088
089 $class = get_class($node);
090
091 return new $class(
092 $this->getEscaperFilter($type, $expression),
093 $node->getLine()
094 );
095 }
096
097 protected function preEscapeFilterNode(Twig_Node_Expression_Filter $filter, Twig_Environment $env)
098 {
099 $name = $filter->getNode('filter')->getAttribute('value');
100
101 $type = $env->getFilter($name)->getPreEscape();
102 if (null === $type) {
103 return $filter;
104 }
105
106 $node = $filter->getNode('node');
107 if ($this->isSafeFor($type, $node, $env)) {
108 return $filter;
109 }
110
111 $filter->setNode('node', $this->getEscaperFilter($type, $node));
112
113 return $filter;
114 }
115
116 protected function isSafeFor($type, Twig_NodeInterface $expression, $env)
117 {
118 $safe = $this->safeAnalysis->getSafe($expression);
119
120 if (null === $safe) {
121 if (null === $this->traverser) {
122 $this->traverser = new Twig_NodeTraverser($env, array($this->safeAnalysis));
123 }
124
125 $this->safeAnalysis->setSafeVars($this->safeVars);
126
127 $this->traverser->traverse($expression);
128 $safe = $this->safeAnalysis->getSafe($expression);
129 }
130
131 return in_array($type, $safe) || in_array('all', $safe);
132 }
133
134 protected function needEscaping(Twig_Environment $env)
135 {
136 if (count($this->statusStack)) {
137 return $this->statusStack[count($this->statusStack) - 1];
138 }
139
140 return $this->defaultStrategy ? $this->defaultStrategy : false;
141 }
142
143 protected function getEscaperFilter($type, Twig_NodeInterface $node)
144 {
145 $line = $node->getLine();
146 $name = new Twig_Node_Expression_Constant('escape', $line);
147 $args = new Twig_Node(array(new Twig_Node_Expression_Constant((string) $type, $line), new Twig_Node_Expression_Constant(null, $line), new Twig_Node_Expression_Constant(true, $line)));
148
149 return new Twig_Node_Expression_Filter($node, $name, $args, $line);
150 }
151
152 /**
153 * {@inheritdoc}
154 */
155 public function getPriority()
156 {
157 return 0;
158 }
159 }
160