1
|
|
|
<?php |
2
|
|
|
|
3
|
|
|
/** |
4
|
|
|
* League.Csv (https://csv.thephpleague.com) |
5
|
|
|
* |
6
|
|
|
* (c) Ignace Nyamagana Butera <[email protected]> |
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
|
|
|
declare(strict_types=1); |
13
|
|
|
|
14
|
|
|
namespace League\Csv; |
15
|
|
|
|
16
|
|
|
use InvalidArgumentException; |
17
|
|
|
use function array_fill_keys; |
18
|
|
|
use function array_keys; |
19
|
|
|
use function array_map; |
20
|
|
|
use function array_merge; |
21
|
|
|
use function array_unique; |
22
|
|
|
use function is_string; |
23
|
|
|
use function method_exists; |
24
|
|
|
use function sprintf; |
25
|
|
|
|
26
|
|
|
/** |
27
|
|
|
* A Formatter to tackle CSV Formula Injection. |
28
|
|
|
* |
29
|
|
|
* @see http://georgemauer.net/2017/10/07/csv-injection.html |
30
|
|
|
*/ |
31
|
|
|
class EscapeFormula |
32
|
|
|
{ |
33
|
|
|
/** |
34
|
|
|
* Spreadsheet formula starting character. |
35
|
|
|
*/ |
36
|
|
|
const FORMULA_STARTING_CHARS = ['=', '-', '+', '@']; |
37
|
|
|
|
38
|
|
|
/** |
39
|
|
|
* Effective Spreadsheet formula starting characters. |
40
|
|
|
* |
41
|
|
|
* @var array |
42
|
|
|
*/ |
43
|
|
|
protected $special_chars = []; |
44
|
|
|
|
45
|
|
|
/** |
46
|
|
|
* Escape character to escape each CSV formula field. |
47
|
|
|
* |
48
|
|
|
* @var string |
49
|
|
|
*/ |
50
|
|
|
protected $escape; |
51
|
|
|
|
52
|
|
|
/** |
53
|
|
|
* New instance. |
54
|
|
|
* |
55
|
|
|
* @param string $escape escape character to escape each CSV formula field |
56
|
|
|
* @param string[] $special_chars additional spreadsheet formula starting characters |
57
|
|
|
* |
58
|
|
|
*/ |
59
|
12 |
|
public function __construct(string $escape = "\t", array $special_chars = []) |
60
|
|
|
{ |
61
|
12 |
|
$this->escape = $escape; |
62
|
12 |
|
if ([] !== $special_chars) { |
63
|
9 |
|
$special_chars = $this->filterSpecialCharacters(...$special_chars); |
64
|
|
|
} |
65
|
|
|
|
66
|
6 |
|
$chars = array_merge(self::FORMULA_STARTING_CHARS, $special_chars); |
67
|
6 |
|
$chars = array_unique($chars); |
68
|
6 |
|
$this->special_chars = array_fill_keys($chars, 1); |
69
|
6 |
|
} |
70
|
|
|
|
71
|
|
|
/** |
72
|
|
|
* Filter submitted special characters. |
73
|
|
|
* |
74
|
|
|
* @param string ...$characters |
75
|
|
|
* |
76
|
|
|
* @throws InvalidArgumentException if the string is not a single character |
77
|
|
|
* |
78
|
|
|
* @return string[] |
79
|
|
|
*/ |
80
|
6 |
|
protected function filterSpecialCharacters(string ...$characters): array |
81
|
|
|
{ |
82
|
6 |
|
foreach ($characters as $str) { |
83
|
6 |
|
if (1 != strlen($str)) { |
84
|
3 |
|
throw new InvalidArgumentException(sprintf('The submitted string %s must be a single character', $str)); |
85
|
|
|
} |
86
|
|
|
} |
87
|
|
|
|
88
|
3 |
|
return $characters; |
89
|
|
|
} |
90
|
|
|
|
91
|
|
|
/** |
92
|
|
|
* Returns the list of character the instance will escape. |
93
|
|
|
* |
94
|
|
|
* @return string[] |
95
|
|
|
*/ |
96
|
3 |
|
public function getSpecialCharacters(): array |
97
|
|
|
{ |
98
|
3 |
|
return array_keys($this->special_chars); |
99
|
|
|
} |
100
|
|
|
|
101
|
|
|
/** |
102
|
|
|
* Returns the escape character. |
103
|
|
|
*/ |
104
|
3 |
|
public function getEscape(): string |
105
|
|
|
{ |
106
|
3 |
|
return $this->escape; |
107
|
|
|
} |
108
|
|
|
|
109
|
|
|
/** |
110
|
|
|
* League CSV formatter hook. |
111
|
|
|
* |
112
|
|
|
* @see escapeRecord |
113
|
|
|
*/ |
114
|
3 |
|
public function __invoke(array $record): array |
115
|
|
|
{ |
116
|
3 |
|
return $this->escapeRecord($record); |
117
|
|
|
} |
118
|
|
|
|
119
|
|
|
/** |
120
|
|
|
* Escape a CSV record. |
121
|
|
|
*/ |
122
|
6 |
|
public function escapeRecord(array $record): array |
123
|
|
|
{ |
124
|
6 |
|
return array_map([$this, 'escapeField'], $record); |
125
|
|
|
} |
126
|
|
|
|
127
|
|
|
/** |
128
|
|
|
* Escape a CSV cell if its content is stringable. |
129
|
|
|
* |
130
|
|
|
* @param mixed $cell the content of the cell |
131
|
|
|
* |
132
|
|
|
* @return mixed|string the escaped content |
133
|
|
|
*/ |
134
|
6 |
|
protected function escapeField($cell) |
135
|
|
|
{ |
136
|
6 |
|
if (!$this->isStringable($cell)) { |
137
|
6 |
|
return $cell; |
138
|
|
|
} |
139
|
|
|
|
140
|
6 |
|
$str_cell = (string) $cell; |
141
|
6 |
|
if (isset($str_cell[0], $this->special_chars[$str_cell[0]])) { |
142
|
6 |
|
return $this->escape.$str_cell; |
143
|
|
|
} |
144
|
|
|
|
145
|
6 |
|
return $cell; |
146
|
|
|
} |
147
|
|
|
|
148
|
|
|
/** |
149
|
|
|
* Tells whether the submitted value is stringable. |
150
|
|
|
* |
151
|
|
|
* @param string|object $value |
152
|
|
|
*/ |
153
|
6 |
|
protected function isStringable($value): bool |
154
|
|
|
{ |
155
|
6 |
|
return is_string($value) || method_exists($value, '__toString'); |
156
|
|
|
} |
157
|
|
|
} |
158
|
|
|
|