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- 27.10.2014
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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 implements Twig_NodeVisitorInterface
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 * Called before child nodes are visited.
033 *
034 * @param Twig_NodeInterface $node The node to visit
035 * @param Twig_Environment $env The Twig environment instance
036 *
037 * @return Twig_NodeInterface The modified node
038 */
039 public function enterNode(Twig_NodeInterface $node, Twig_Environment $env)
040 {
041 if ($node instanceof Twig_Node_Module) {
042 if ($env->hasExtension('escaper') && $defaultStrategy = $env->getExtension('escaper')->getDefaultStrategy($node->getAttribute('filename'))) {
043 $this->defaultStrategy = $defaultStrategy;
044 }
045 $this->safeVars = array();
046 } elseif ($node instanceof Twig_Node_AutoEscape) {
047 $this->statusStack[] = $node->getAttribute('value');
048 } elseif ($node instanceof Twig_Node_Block) {
049 $this->statusStack[] = isset($this->blocks[$node->getAttribute('name')]) ? $this->blocks[$node->getAttribute('name')] : $this->needEscaping($env);
050 } elseif ($node instanceof Twig_Node_Import) {
051 $this->safeVars[] = $node->getNode('var')->getAttribute('name');
052 }
053
054 return $node;
055 }
056
057 /**
058 * Called after child nodes are visited.
059 *
060 * @param Twig_NodeInterface $node The node to visit
061 * @param Twig_Environment $env The Twig environment instance
062 *
063 * @return Twig_NodeInterface The modified node
064 */
065 public function leaveNode(Twig_NodeInterface $node, Twig_Environment $env)
066 {
067 if ($node instanceof Twig_Node_Module) {
068 $this->defaultStrategy = false;
069 $this->safeVars = array();
070 } elseif ($node instanceof Twig_Node_Expression_Filter) {
071 return $this->preEscapeFilterNode($node, $env);
072 } elseif ($node instanceof Twig_Node_Print) {
073 return $this->escapePrintNode($node, $env, $this->needEscaping($env));
074 }
075
076 if ($node instanceof Twig_Node_AutoEscape || $node instanceof Twig_Node_Block) {
077 array_pop($this->statusStack);
078 } elseif ($node instanceof Twig_Node_BlockReference) {
079 $this->blocks[$node->getAttribute('name')] = $this->needEscaping($env);
080 }
081
082 return $node;
083 }
084
085 protected function escapePrintNode(Twig_Node_Print $node, Twig_Environment $env, $type)
086 {
087 if (false === $type) {
088 return $node;
089 }
090
091 $expression = $node->getNode('expr');
092
093 if ($this->isSafeFor($type, $expression, $env)) {
094 return $node;
095 }
096
097 $class = get_class($node);
098
099 return new $class(
100 $this->getEscaperFilter($type, $expression),
101 $node->getLine()
102 );
103 }
104
105 protected function preEscapeFilterNode(Twig_Node_Expression_Filter $filter, Twig_Environment $env)
106 {
107 $name = $filter->getNode('filter')->getAttribute('value');
108
109 $type = $env->getFilter($name)->getPreEscape();
110 if (null === $type) {
111 return $filter;
112 }
113
114 $node = $filter->getNode('node');
115 if ($this->isSafeFor($type, $node, $env)) {
116 return $filter;
117 }
118
119 $filter->setNode('node', $this->getEscaperFilter($type, $node));
120
121 return $filter;
122 }
123
124 protected function isSafeFor($type, Twig_NodeInterface $expression, $env)
125 {
126 $safe = $this->safeAnalysis->getSafe($expression);
127
128 if (null === $safe) {
129 if (null === $this->traverser) {
130 $this->traverser = new Twig_NodeTraverser($env, array($this->safeAnalysis));
131 }
132
133 $this->safeAnalysis->setSafeVars($this->safeVars);
134
135 $this->traverser->traverse($expression);
136 $safe = $this->safeAnalysis->getSafe($expression);
137 }
138
139 return in_array($type, $safe) || in_array('all', $safe);
140 }
141
142 protected function needEscaping(Twig_Environment $env)
143 {
144 if (count($this->statusStack)) {
145 return $this->statusStack[count($this->statusStack) - 1];
146 }
147
148 return $this->defaultStrategy ? $this->defaultStrategy : false;
149 }
150
151 protected function getEscaperFilter($type, Twig_NodeInterface $node)
152 {
153 $line = $node->getLine();
154 $name = new Twig_Node_Expression_Constant('escape', $line);
155 $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, $line)));
156
157 return new Twig_Node_Expression_Filter($node, $name, $args, $line);
158 }
159
160 /**
161 * {@inheritdoc}
162 */
163 public function getPriority()
164 {
165 return 0;
166 }
167 }
168