|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace PiedWeb\UrlHarvester; |
|
4
|
|
|
|
|
5
|
|
|
use InvalidArgumentException; |
|
6
|
|
|
|
|
7
|
|
|
/** |
|
8
|
|
|
* Waiting validation for PR : |
|
9
|
|
|
* https://github.com/spatie/robots-txt/pull/21. |
|
10
|
|
|
*/ |
|
11
|
|
|
class RobotsHeaders |
|
12
|
|
|
{ |
|
13
|
|
|
protected $robotHeadersProperties = []; |
|
14
|
|
|
|
|
15
|
|
|
public static function readFrom(string $source): self |
|
16
|
|
|
{ |
|
17
|
|
|
$content = @file_get_contents($source); |
|
18
|
|
|
|
|
19
|
|
|
if (false === $content) { |
|
20
|
|
|
throw new InvalidArgumentException("Could not read from source `{$source}`"); |
|
21
|
|
|
} |
|
22
|
|
|
|
|
23
|
|
|
return new self($http_response_header ?? []); |
|
24
|
|
|
} |
|
25
|
|
|
|
|
26
|
9 |
|
public static function create(array $headers): self |
|
27
|
|
|
{ |
|
28
|
9 |
|
return new self($headers); |
|
29
|
|
|
} |
|
30
|
|
|
|
|
31
|
9 |
|
public function __construct(array $headers) |
|
32
|
|
|
{ |
|
33
|
9 |
|
$this->robotHeadersProperties = $this->parseHeaders($headers); |
|
34
|
9 |
|
} |
|
35
|
|
|
|
|
36
|
9 |
|
public function mayIndex(string $userAgent = '*'): bool |
|
37
|
|
|
{ |
|
38
|
9 |
|
return !$this->noindex($userAgent); |
|
39
|
|
|
} |
|
40
|
|
|
|
|
41
|
|
|
public function mayFollow(string $userAgent = '*'): bool |
|
42
|
|
|
{ |
|
43
|
|
|
return !$this->nofollow($userAgent); |
|
44
|
|
|
} |
|
45
|
|
|
|
|
46
|
9 |
|
public function noindex(string $userAgent = '*'): bool |
|
47
|
|
|
{ |
|
48
|
|
|
return |
|
49
|
|
|
// 1. We check for the suggested user-agent |
|
50
|
9 |
|
$this->robotHeadersProperties[$userAgent]['noindex'] |
|
51
|
|
|
// 2. We check for all user-agent |
|
52
|
9 |
|
?? $this->robotHeadersProperties['*']['noindex'] |
|
53
|
|
|
// 3. noindex doesn't exist, so return fasle |
|
54
|
9 |
|
?? false; |
|
55
|
|
|
} |
|
56
|
|
|
|
|
57
|
|
|
public function nofollow(string $userAgent = '*'): bool |
|
58
|
|
|
{ |
|
59
|
|
|
return |
|
60
|
|
|
$this->robotHeadersProperties[$userAgent]['nofollow'] |
|
61
|
|
|
?? $this->robotHeadersProperties['*']['nofollow'] |
|
62
|
|
|
?? false; |
|
63
|
|
|
} |
|
64
|
|
|
|
|
65
|
9 |
|
protected function parseHeaders(array $headers): array |
|
66
|
|
|
{ |
|
67
|
9 |
|
$robotHeaders = $this->filterRobotHeaders($headers); |
|
68
|
|
|
|
|
69
|
|
|
return array_reduce($robotHeaders, function (array $parsedHeaders, $header) { |
|
70
|
3 |
|
$header = $this->normalizeHeaders($header); |
|
71
|
|
|
|
|
72
|
3 |
|
$headerParts = explode(':', $header); |
|
73
|
|
|
|
|
74
|
3 |
|
$userAgent = 3 === count($headerParts) |
|
75
|
|
|
? trim($headerParts[1]) |
|
76
|
3 |
|
: '*'; |
|
77
|
|
|
|
|
78
|
3 |
|
$options = end($headerParts); |
|
79
|
|
|
|
|
80
|
3 |
|
$parsedHeaders[$userAgent] = [ |
|
81
|
3 |
|
'noindex' => false !== strpos(strtolower($options), 'noindex'), |
|
82
|
3 |
|
'nofollow' => false !== strpos(strtolower($options), 'nofollow'), |
|
83
|
|
|
]; |
|
84
|
|
|
|
|
85
|
3 |
|
return $parsedHeaders; |
|
86
|
9 |
|
}, []); |
|
87
|
|
|
} |
|
88
|
|
|
|
|
89
|
9 |
|
protected function filterRobotHeaders(array $headers): array |
|
90
|
|
|
{ |
|
91
|
|
|
return array_filter($headers, function ($header) use ($headers) { |
|
92
|
9 |
|
$headerContent = $this->normalizeHeaders($headers[$header] ?? []); |
|
93
|
|
|
|
|
94
|
9 |
|
return 0 === strpos(strtolower($header), 'x-robots-tag') |
|
95
|
9 |
|
|| 0 === strpos(strtolower($headerContent), 'x-robots-tag'); |
|
96
|
9 |
|
}, ARRAY_FILTER_USE_KEY); |
|
97
|
|
|
} |
|
98
|
|
|
|
|
99
|
9 |
|
protected function normalizeHeaders($headers): string |
|
100
|
|
|
{ |
|
101
|
9 |
|
return implode(',', (array) $headers); |
|
102
|
|
|
} |
|
103
|
|
|
} |
|
104
|
|
|
|
PiedWeb /
UrlHarvester
