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- 06.01.2017
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SafeAnalysis.php
001 <?php
002
003 /*
004 * This file is part of Twig.
005 *
006 * (c) 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 class Twig_NodeVisitor_SafeAnalysis extends Twig_BaseNodeVisitor
013 {
014 protected $data = array();
015 protected $safeVars = array();
016
017 public function setSafeVars($safeVars)
018 {
019 $this->safeVars = $safeVars;
020 }
021
022 public function getSafe(Twig_NodeInterface $node)
023 {
024 $hash = spl_object_hash($node);
025 if (!isset($this->data[$hash])) {
026 return;
027 }
028
029 foreach ($this->data[$hash] as $bucket) {
030 if ($bucket['key'] !== $node) {
031 continue;
032 }
033
034 if (in_array('html_attr', $bucket['value'])) {
035 $bucket['value'][] = 'html';
036 }
037
038 return $bucket['value'];
039 }
040 }
041
042 protected function setSafe(Twig_NodeInterface $node, array $safe)
043 {
044 $hash = spl_object_hash($node);
045 if (isset($this->data[$hash])) {
046 foreach ($this->data[$hash] as &$bucket) {
047 if ($bucket['key'] === $node) {
048 $bucket['value'] = $safe;
049
050 return;
051 }
052 }
053 }
054 $this->data[$hash][] = array(
055 'key' => $node,
056 'value' => $safe,
057 );
058 }
059
060 /**
061 * {@inheritdoc}
062 */
063 protected function doEnterNode(Twig_Node $node, Twig_Environment $env)
064 {
065 return $node;
066 }
067
068 /**
069 * {@inheritdoc}
070 */
071 protected function doLeaveNode(Twig_Node $node, Twig_Environment $env)
072 {
073 if ($node instanceof Twig_Node_Expression_Constant) {
074 // constants are marked safe for all
075 $this->setSafe($node, array('all'));
076 } elseif ($node instanceof Twig_Node_Expression_BlockReference) {
077 // blocks are safe by definition
078 $this->setSafe($node, array('all'));
079 } elseif ($node instanceof Twig_Node_Expression_Parent) {
080 // parent block is safe by definition
081 $this->setSafe($node, array('all'));
082 } elseif ($node instanceof Twig_Node_Expression_Conditional) {
083 // intersect safeness of both operands
084 $safe = $this->intersectSafe($this->getSafe($node->getNode('expr2')), $this->getSafe($node->getNode('expr3')));
085 $this->setSafe($node, $safe);
086 } elseif ($node instanceof Twig_Node_Expression_Filter) {
087 // filter expression is safe when the filter is safe
088 $name = $node->getNode('filter')->getAttribute('value');
089 $args = $node->getNode('arguments');
090 if (false !== $filter = $env->getFilter($name)) {
091 $safe = $filter->getSafe($args);
092 if (null === $safe) {
093 $safe = $this->intersectSafe($this->getSafe($node->getNode('node')), $filter->getPreservesSafety());
094 }
095 $this->setSafe($node, $safe);
096 } else {
097 $this->setSafe($node, array());
098 }
099 } elseif ($node instanceof Twig_Node_Expression_Function) {
100 // function expression is safe when the function is safe
101 $name = $node->getAttribute('name');
102 $args = $node->getNode('arguments');
103 $function = $env->getFunction($name);
104 if (false !== $function) {
105 $this->setSafe($node, $function->getSafe($args));
106 } else {
107 $this->setSafe($node, array());
108 }
109 } elseif ($node instanceof Twig_Node_Expression_MethodCall) {
110 if ($node->getAttribute('safe')) {
111 $this->setSafe($node, array('all'));
112 } else {
113 $this->setSafe($node, array());
114 }
115 } elseif ($node instanceof Twig_Node_Expression_GetAttr && $node->getNode('node') instanceof Twig_Node_Expression_Name) {
116 $name = $node->getNode('node')->getAttribute('name');
117 // attributes on template instances are safe
118 if ('_self' == $name || in_array($name, $this->safeVars)) {
119 $this->setSafe($node, array('all'));
120 } else {
121 $this->setSafe($node, array());
122 }
123 } else {
124 $this->setSafe($node, array());
125 }
126
127 return $node;
128 }
129
130 protected function intersectSafe(array $a = null, array $b = null)
131 {
132 if (null === $a || null === $b) {
133 return array();
134 }
135
136 if (in_array('all', $a)) {
137 return $b;
138 }
139
140 if (in_array('all', $b)) {
141 return $a;
142 }
143
144 return array_intersect($a, $b);
145 }
146
147 /**
148 * {@inheritdoc}
149 */
150 public function getPriority()
151 {
152 return 0;
153 }
154 }
155