|
1
|
|
|
<?php declare(strict_types=1); |
|
2
|
|
|
/* |
|
3
|
|
|
* This file is part of the feed-io package. |
|
4
|
|
|
* |
|
5
|
|
|
* (c) Alexandre Debril <[email protected]> |
|
6
|
|
|
* |
|
7
|
|
|
* For the full copyright and license information, please view the LICENSE |
|
8
|
|
|
* file that was distributed with this source code. |
|
9
|
|
|
*/ |
|
10
|
|
|
|
|
11
|
|
|
namespace FeedIo; |
|
12
|
|
|
|
|
13
|
|
|
use FeedIo\Adapter\ClientInterface; |
|
14
|
|
|
use Psr\Log\LoggerInterface; |
|
15
|
|
|
|
|
16
|
|
|
class Explorer |
|
17
|
|
|
{ |
|
18
|
|
|
|
|
19
|
|
|
/** |
|
20
|
|
|
* @var \FeedIo\Adapter\ClientInterface; |
|
21
|
|
|
*/ |
|
22
|
|
|
protected $client; |
|
23
|
|
|
|
|
24
|
|
|
/** |
|
25
|
|
|
* @var \Psr\Log\LoggerInterface |
|
26
|
|
|
*/ |
|
27
|
|
|
protected $logger; |
|
28
|
|
|
|
|
29
|
|
|
const VALID_TYPES = [ |
|
30
|
|
|
'application/atom+xml', |
|
31
|
|
|
'application/rss+xml' |
|
32
|
|
|
]; |
|
33
|
|
|
|
|
34
|
|
|
/** |
|
35
|
|
|
* @param \FeedIo\Adapter\ClientInterface $client |
|
36
|
|
|
* @param \Psr\Log\LoggerInterface $logger |
|
37
|
|
|
*/ |
|
38
|
1 |
|
public function __construct(ClientInterface $client, LoggerInterface $logger) |
|
39
|
|
|
{ |
|
40
|
1 |
|
$this->client = $client; |
|
41
|
1 |
|
$this->logger = $logger; |
|
42
|
1 |
|
} |
|
43
|
|
|
|
|
44
|
|
|
/** |
|
45
|
|
|
* Discover feeds from the webpage's headers |
|
46
|
|
|
* @param string $url |
|
47
|
|
|
* @return array |
|
48
|
|
|
*/ |
|
49
|
1 |
|
public function discover(string $url) : array |
|
50
|
|
|
{ |
|
51
|
1 |
|
$this->logger->info("discover feeds from {$url}"); |
|
52
|
1 |
|
$stream = $this->client->getResponse($url, new \DateTime('@0')); |
|
53
|
|
|
|
|
54
|
1 |
|
$internalErrors = libxml_use_internal_errors(true); |
|
55
|
1 |
|
if (LIBXML_VERSION < 20900) { |
|
56
|
|
|
$entityLoaderDisabled = libxml_disable_entity_loader(true); |
|
57
|
|
|
} |
|
58
|
|
|
|
|
59
|
1 |
|
$feeds = $this->extractFeeds($stream->getBody()); |
|
60
|
|
|
|
|
61
|
1 |
|
libxml_use_internal_errors($internalErrors); |
|
62
|
1 |
|
if (LIBXML_VERSION < 20900) { |
|
63
|
|
|
libxml_disable_entity_loader($entityLoaderDisabled); |
|
|
|
|
|
|
64
|
|
|
} |
|
65
|
|
|
|
|
66
|
1 |
|
return $feeds; |
|
67
|
|
|
} |
|
68
|
|
|
|
|
69
|
|
|
/** |
|
70
|
|
|
* Extract feeds Urls from HTML stream |
|
71
|
|
|
* @param string $html |
|
72
|
|
|
* @return array |
|
73
|
|
|
*/ |
|
74
|
1 |
|
protected function extractFeeds(string $html) : array |
|
75
|
|
|
{ |
|
76
|
1 |
|
$dom = new \DOMDocument(); |
|
77
|
1 |
|
$dom->loadHTML($html); |
|
78
|
|
|
|
|
79
|
1 |
|
$links = $dom->getElementsByTagName('link'); |
|
80
|
1 |
|
$feeds = []; |
|
81
|
1 |
|
foreach ($links as $link) { |
|
82
|
1 |
|
if ($this->isFeedLink($link)) { |
|
83
|
1 |
|
$feeds[] = $link->getAttribute('href'); |
|
84
|
|
|
} |
|
85
|
|
|
} |
|
86
|
|
|
|
|
87
|
1 |
|
return $feeds; |
|
88
|
|
|
} |
|
89
|
|
|
|
|
90
|
|
|
/** |
|
91
|
|
|
* Tells if the given Element contains a valid Feed Url |
|
92
|
|
|
* @param DomElement $element |
|
93
|
|
|
* @return bool |
|
94
|
|
|
*/ |
|
95
|
1 |
|
protected function isFeedLink(\DomElement $element) : bool |
|
96
|
|
|
{ |
|
97
|
1 |
|
return $element->hasAttribute('type') |
|
98
|
1 |
|
&& in_array($element->getAttribute('type'), self::VALID_TYPES); |
|
99
|
|
|
} |
|
100
|
|
|
} |
|
101
|
|
|
|
alexdebril /
feed-io
If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: