1
|
<?php
|
2
|
|
3
|
/*
|
4
|
* This file is part of Twig.
|
5
|
*
|
6
|
* (c) 2009 Fabien Potencier
|
7
|
*
|
8
|
* For the full copyright and license information, please view the LICENSE
|
9
|
* file that was distributed with this source code.
|
10
|
*/
|
11
|
|
12
|
/**
|
13
|
* Twig_NodeVisitor_Sandbox implements sandboxing.
|
14
|
*
|
15
|
* @package twig
|
16
|
* @author Fabien Potencier <fabien@symfony.com>
|
17
|
*/
|
18
|
class Twig_NodeVisitor_Sandbox implements Twig_NodeVisitorInterface
|
19
|
{
|
20
|
protected $inAModule = false;
|
21
|
protected $tags;
|
22
|
protected $filters;
|
23
|
protected $functions;
|
24
|
|
25
|
/**
|
26
|
* Called before child nodes are visited.
|
27
|
*
|
28
|
* @param Twig_NodeInterface $node The node to visit
|
29
|
* @param Twig_Environment $env The Twig environment instance
|
30
|
*
|
31
|
* @return Twig_NodeInterface The modified node
|
32
|
*/
|
33
|
public function enterNode(Twig_NodeInterface $node, Twig_Environment $env)
|
34
|
{
|
35
|
// in a sandbox tag, only include tags are allowed
|
36
|
if ($node instanceof Twig_Node_Sandbox && !$node->getNode('body') instanceof Twig_Node_Include) {
|
37
|
foreach ($node->getNode('body') as $n) {
|
38
|
if ($n instanceof Twig_Node_Text && ctype_space($n->getAttribute('data'))) {
|
39
|
continue;
|
40
|
}
|
41
|
|
42
|
if (!$n instanceof Twig_Node_Include) {
|
43
|
throw new Twig_Error_Syntax('Only "include" tags are allowed within a "sandbox" section', $n->getLine());
|
44
|
}
|
45
|
}
|
46
|
}
|
47
|
|
48
|
if ($node instanceof Twig_Node_Module) {
|
49
|
$this->inAModule = true;
|
50
|
$this->tags = array();
|
51
|
$this->filters = array();
|
52
|
$this->functions = array();
|
53
|
|
54
|
return $node;
|
55
|
} elseif ($this->inAModule) {
|
56
|
// look for tags
|
57
|
if ($node->getNodeTag()) {
|
58
|
$this->tags[] = $node->getNodeTag();
|
59
|
}
|
60
|
|
61
|
// look for filters
|
62
|
if ($node instanceof Twig_Node_Expression_Filter) {
|
63
|
$this->filters[] = $node->getNode('filter')->getAttribute('value');
|
64
|
}
|
65
|
|
66
|
// look for functions
|
67
|
if ($node instanceof Twig_Node_Expression_Function) {
|
68
|
$this->functions[] = $node->getAttribute('name');
|
69
|
}
|
70
|
|
71
|
// wrap print to check __toString() calls
|
72
|
if ($node instanceof Twig_Node_Print) {
|
73
|
return new Twig_Node_SandboxedPrint($node->getNode('expr'), $node->getLine(), $node->getNodeTag());
|
74
|
}
|
75
|
}
|
76
|
|
77
|
return $node;
|
78
|
}
|
79
|
|
80
|
/**
|
81
|
* Called after child nodes are visited.
|
82
|
*
|
83
|
* @param Twig_NodeInterface $node The node to visit
|
84
|
* @param Twig_Environment $env The Twig environment instance
|
85
|
*
|
86
|
* @return Twig_NodeInterface The modified node
|
87
|
*/
|
88
|
public function leaveNode(Twig_NodeInterface $node, Twig_Environment $env)
|
89
|
{
|
90
|
if ($node instanceof Twig_Node_Module) {
|
91
|
$this->inAModule = false;
|
92
|
|
93
|
return new Twig_Node_SandboxedModule($node, array_unique($this->filters), array_unique($this->tags), array_unique($this->functions));
|
94
|
}
|
95
|
|
96
|
return $node;
|
97
|
}
|
98
|
|
99
|
/**
|
100
|
* {@inheritdoc}
|
101
|
*/
|
102
|
public function getPriority()
|
103
|
{
|
104
|
return 0;
|
105
|
}
|
106
|
}
|