|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace tomzx\PolicyEvaluator; |
|
4
|
|
|
|
|
5
|
|
|
class Evaluator |
|
6
|
|
|
{ |
|
7
|
|
|
/** |
|
8
|
|
|
* @var array |
|
9
|
|
|
*/ |
|
10
|
|
|
private $policies; |
|
11
|
|
|
|
|
12
|
|
|
/** |
|
13
|
|
|
* @var array |
|
14
|
|
|
*/ |
|
15
|
|
|
private $variables; |
|
16
|
|
|
|
|
17
|
|
|
/** |
|
18
|
|
|
* @var Statement[] |
|
19
|
|
|
*/ |
|
20
|
|
|
private $statements; |
|
21
|
|
|
|
|
22
|
|
|
/** |
|
23
|
|
|
* @param array $policies |
|
24
|
|
|
*/ |
|
25
|
12 |
|
public function __construct(array $policies, array $variables = []) |
|
26
|
|
|
{ |
|
27
|
12 |
|
$this->policies = $policies; |
|
28
|
12 |
|
$this->variables = $variables; |
|
29
|
|
|
|
|
30
|
12 |
|
if ( ! isset($this->policies['Statement'])) { |
|
31
|
1 |
|
throw new \InvalidArgumentException('The policy must have at least one statement.'); |
|
32
|
|
|
} |
|
33
|
|
|
|
|
34
|
11 |
|
$this->parseStatements($this->policies['Statement']); |
|
35
|
9 |
|
} |
|
36
|
|
|
|
|
37
|
|
|
/** |
|
38
|
|
|
* @return array |
|
39
|
|
|
*/ |
|
40
|
|
|
public function getStatements() |
|
41
|
|
|
{ |
|
42
|
|
|
return $this->statements; |
|
43
|
|
|
} |
|
44
|
|
|
|
|
45
|
|
|
/** |
|
46
|
|
|
* @return array |
|
47
|
|
|
*/ |
|
48
|
|
|
public function getVariables() |
|
49
|
|
|
{ |
|
50
|
|
|
return $this->variables; |
|
51
|
|
|
} |
|
52
|
|
|
|
|
53
|
|
|
/** |
|
54
|
|
|
* @param string $action |
|
55
|
|
|
* @param string $resource |
|
56
|
|
|
* @param array $variables |
|
57
|
|
|
* @return bool |
|
58
|
|
|
*/ |
|
59
|
8 |
|
public function canExecuteActionOnResource($action, $resource, array $variables = []) |
|
60
|
|
|
{ |
|
61
|
|
|
// TODO([email protected]): Validate action and resource are in valid format |
|
62
|
8 |
|
$statements = $this->matchStatement($action, $resource, $variables); |
|
63
|
|
|
|
|
64
|
8 |
|
foreach ($statements as $statement) { |
|
65
|
|
|
// If we found a matching statement with an explicit deny, deny right away |
|
66
|
6 |
|
if ($statement->getEffect()->isDeny()) { |
|
67
|
6 |
|
return false; |
|
68
|
|
|
} |
|
69
|
|
|
} |
|
70
|
|
|
|
|
71
|
6 |
|
return ! empty($statements); |
|
72
|
|
|
} |
|
73
|
|
|
|
|
74
|
|
|
/** |
|
75
|
|
|
* @param string $document |
|
76
|
|
|
* @return \tomzx\PolicyEvaluator\Evaluator |
|
77
|
|
|
*/ |
|
78
|
|
|
public static function fromJsonString($document) |
|
79
|
|
|
{ |
|
80
|
|
|
return new self(json_decode($document, true)); |
|
81
|
|
|
} |
|
82
|
|
|
|
|
83
|
|
|
/** |
|
84
|
|
|
* @param array $statements |
|
85
|
|
|
*/ |
|
86
|
11 |
|
private function parseStatements(array $statements) |
|
87
|
|
|
{ |
|
88
|
11 |
|
if (empty($statements)) { |
|
89
|
1 |
|
throw new \InvalidArgumentException('The policy must have at least one statement.'); |
|
90
|
|
|
} |
|
91
|
|
|
|
|
92
|
10 |
|
foreach ($statements as $statement) { |
|
93
|
10 |
|
$statement = $this->makeStatement($statement); |
|
94
|
9 |
|
$this->statements[] = $statement; |
|
95
|
|
|
} |
|
96
|
9 |
|
} |
|
97
|
|
|
|
|
98
|
|
|
/** |
|
99
|
|
|
* @param array $statement |
|
100
|
|
|
* @return \tomzx\PolicyEvaluator\Statement |
|
101
|
|
|
*/ |
|
102
|
10 |
|
protected function makeStatement(array $statement) |
|
103
|
|
|
{ |
|
104
|
10 |
|
return new Statement($statement); |
|
105
|
|
|
} |
|
106
|
|
|
|
|
107
|
|
|
/** |
|
108
|
|
|
* @param string $action |
|
109
|
|
|
* @param string $resource |
|
110
|
|
|
* @param array $variables |
|
111
|
|
|
* @return array |
|
112
|
|
|
*/ |
|
113
|
8 |
|
public function matchStatement($action, $resource, array $variables = []) |
|
114
|
|
|
{ |
|
115
|
8 |
|
$variables += $this->variables; |
|
116
|
8 |
|
$statements = []; |
|
117
|
8 |
|
foreach ($this->statements as $statement) { |
|
118
|
8 |
|
if ( ! $statement->matchesAction($action)) { |
|
119
|
1 |
|
continue; |
|
120
|
|
|
} |
|
121
|
|
|
|
|
122
|
7 |
|
if ( ! $statement->matchesResource($resource, $variables)) { |
|
123
|
1 |
|
continue; |
|
124
|
|
|
} |
|
125
|
|
|
|
|
126
|
6 |
|
$statements[] = $statement; |
|
127
|
|
|
} |
|
128
|
8 |
|
return $statements; |
|
129
|
|
|
} |
|
130
|
|
|
} |
|
131
|
|
|
|
tomzx /
policy-evaluator
