|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace WebThumbnailer\Finder; |
|
4
|
|
|
|
|
5
|
|
|
use WebThumbnailer\Application\ConfigManager; |
|
6
|
|
|
use WebThumbnailer\Application\WebAccess\WebAccess; |
|
7
|
|
|
use WebThumbnailer\Application\WebAccess\WebAccessCUrl; |
|
8
|
|
|
use WebThumbnailer\Application\WebAccess\WebAccessFactory; |
|
9
|
|
|
use WebThumbnailer\Utils\ImageUtils; |
|
10
|
|
|
use WebThumbnailer\Utils\UrlUtils; |
|
11
|
|
|
|
|
12
|
|
|
/** |
|
13
|
|
|
* Class DefaultFinder |
|
14
|
|
|
* |
|
15
|
|
|
* This finder isn't linked to any domain. |
|
16
|
|
|
* It will return the resource if it is an image (by extension, or by content). |
|
17
|
|
|
* Otherwise, it'll try to retrieve an OpenGraph resource. |
|
18
|
|
|
* |
|
19
|
|
|
* @package WebThumbnailer\Finder |
|
20
|
|
|
*/ |
|
21
|
|
|
class DefaultFinder extends FinderCommon |
|
22
|
|
|
{ |
|
23
|
|
|
/** |
|
24
|
|
|
* @var WebAccess instance. |
|
25
|
|
|
*/ |
|
26
|
|
|
protected $webAccess; |
|
27
|
|
|
|
|
28
|
|
|
/** |
|
29
|
|
|
* @inheritdoc |
|
30
|
|
|
*/ |
|
31
|
|
|
public function __construct($domain, $url, $rules, $options) |
|
32
|
|
|
{ |
|
33
|
|
|
$this->webAccess = WebAccessFactory::getWebAccess($url); |
|
34
|
|
|
$this->url = $url; |
|
35
|
|
|
$this->domain = $domain; |
|
36
|
|
|
} |
|
37
|
|
|
|
|
38
|
|
|
/** |
|
39
|
|
|
* Generic finder. |
|
40
|
|
|
* |
|
41
|
|
|
* @inheritdoc |
|
42
|
|
|
*/ |
|
43
|
|
|
public function find() |
|
44
|
|
|
{ |
|
45
|
|
|
if (ImageUtils::isImageExtension(UrlUtils::getUrlFileExtension($this->url))) { |
|
46
|
|
|
return $this->url; |
|
47
|
|
|
} |
|
48
|
|
|
|
|
49
|
|
|
$content = $thumbnail = null; |
|
50
|
|
|
$callback = $this->webAccess instanceof WebAccessCUrl |
|
51
|
|
|
? $this->getCurlCallback($content, $thumbnail) |
|
52
|
|
|
: null; |
|
53
|
|
|
list($headers, $content) = $this->webAccess->getContent( |
|
54
|
|
|
$this->url, |
|
55
|
|
|
(int) ConfigManager::get('settings.default.timeout', 30), |
|
56
|
|
|
(int) ConfigManager::get('settings.default.max_img_dl', 16777216), |
|
57
|
|
|
$callback, |
|
58
|
|
|
$content |
|
59
|
|
|
); |
|
60
|
|
|
|
|
61
|
|
|
if (empty($thumbnail) && ImageUtils::isImageString($content)) { |
|
62
|
|
|
return $this->url; |
|
63
|
|
|
} |
|
64
|
|
|
|
|
65
|
|
|
if (empty($thumbnail) && ! empty($headers) && strpos($headers[0], '200') === false) { |
|
66
|
|
|
return false; |
|
67
|
|
|
} |
|
68
|
|
|
|
|
69
|
|
|
// With curl, the thumb is extracted during the download |
|
70
|
|
|
if ($this->webAccess instanceof WebAccessCUrl && ! empty($thumbnail)) { |
|
71
|
|
|
return $thumbnail; |
|
72
|
|
|
} |
|
73
|
|
|
|
|
74
|
|
|
return ! empty($content) ? self::extractMetaTag($content) : false; |
|
75
|
|
|
} |
|
76
|
|
|
|
|
77
|
|
|
/** |
|
78
|
|
|
* Get a callback for curl write function. |
|
79
|
|
|
* |
|
80
|
|
|
* @param string $content A variable reference in which the downloaded content should be stored. |
|
81
|
|
|
* @param string $thumbnail A variable reference in which extracted thumb URL should be stored. |
|
82
|
|
|
* |
|
83
|
|
|
* @return \Closure CURLOPT_WRITEFUNCTION callback |
|
84
|
|
|
*/ |
|
85
|
|
|
protected function getCurlCallback(&$content, &$thumbnail) |
|
86
|
|
|
{ |
|
87
|
|
|
$url = $this->url; |
|
88
|
|
|
$isRedirected = false; |
|
89
|
|
|
|
|
90
|
|
|
/** |
|
91
|
|
|
* cURL callback function for CURLOPT_WRITEFUNCTION (called during the download). |
|
92
|
|
|
* |
|
93
|
|
|
* While downloading the remote page, we check that the HTTP code is 200 and content type is 'html/text' |
|
94
|
|
|
* Then we extract the title and the charset and stop the download when it's done. |
|
95
|
|
|
* |
|
96
|
|
|
* Note that when using CURLOPT_WRITEFUNCTION, we have to manually handle the content retrieved, |
|
97
|
|
|
* hence the $content reference variable. |
|
98
|
|
|
* |
|
99
|
|
|
* @param resource $ch cURL resource |
|
100
|
|
|
* @param string $data chunk of data being downloaded |
|
101
|
|
|
* |
|
102
|
|
|
* @return int|bool length of $data or false if we need to stop the download |
|
103
|
|
|
*/ |
|
104
|
|
|
return function (&$ch, $data) use ($url, &$content, &$thumbnail, &$isRedirected) { |
|
105
|
|
|
$content .= $data; |
|
106
|
|
|
$responseCode = curl_getinfo($ch, CURLINFO_RESPONSE_CODE); |
|
107
|
|
|
if (!empty($responseCode) && in_array($responseCode, [301, 302])) { |
|
108
|
|
|
$isRedirected = true; |
|
109
|
|
|
return strlen($data); |
|
110
|
|
|
} |
|
111
|
|
|
if (!empty($responseCode) && $responseCode !== 200) { |
|
112
|
|
|
return false; |
|
113
|
|
|
} |
|
114
|
|
|
// After a redirection, the content type will keep the previous request value |
|
115
|
|
|
// until it finds the next content-type header. |
|
116
|
|
|
if (! $isRedirected || strpos(strtolower($data), 'content-type') !== false) { |
|
117
|
|
|
$contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE); |
|
118
|
|
|
} |
|
119
|
|
|
// we look for image, and ignore application/octet-stream, |
|
120
|
|
|
// which is a the default content type for any binary |
|
121
|
|
|
// @see https://developer.mozilla.org/fr/docs/Web/HTTP/Basics_of_HTTP/MIME_types |
|
122
|
|
|
if (!empty($contentType) |
|
123
|
|
|
&& strpos($contentType, 'image/') !== false |
|
124
|
|
|
&& strpos($contentType, 'application/octet-stream') === false |
|
125
|
|
|
) { |
|
126
|
|
|
$thumbnail = $url; |
|
127
|
|
|
return false; |
|
128
|
|
|
} elseif (!empty($contentType) |
|
129
|
|
|
&& strpos($contentType, 'text/html') === false |
|
130
|
|
|
&& strpos($contentType, 'application/octet-stream') === false |
|
131
|
|
|
) { |
|
132
|
|
|
return false; |
|
133
|
|
|
} |
|
134
|
|
|
if (empty($thumbnail)) { |
|
135
|
|
|
$thumbnail = DefaultFinder::extractMetaTag($data); |
|
136
|
|
|
} |
|
137
|
|
|
// We got everything we want, stop the download. |
|
138
|
|
|
if (!empty($responseCode) && !empty($contentType) && !empty($thumbnail)) { |
|
139
|
|
|
return false; |
|
140
|
|
|
} |
|
141
|
|
|
|
|
142
|
|
|
return strlen($data); |
|
143
|
|
|
}; |
|
144
|
|
|
} |
|
145
|
|
|
|
|
146
|
|
|
/** |
|
147
|
|
|
* Applies the regexp on the HTML $content to extract the thumb URL. |
|
148
|
|
|
* |
|
149
|
|
|
* @param string $content Downloaded HTML content |
|
150
|
|
|
* |
|
151
|
|
|
* @return string|bool Extracted thumb URL or false if not found. |
|
152
|
|
|
*/ |
|
153
|
|
|
public static function extractMetaTag($content) |
|
154
|
|
|
{ |
|
155
|
|
|
$propertiesKey = ['property', 'name', 'itemprop']; |
|
156
|
|
|
$properties = implode('|', $propertiesKey); |
|
157
|
|
|
// Try to retrieve OpenGraph image. |
|
158
|
|
|
$ogRegex = '#<meta[^>]+(?:'. $properties .')=["\']?og:image["\'\s][^>]*content=["\']?(.*?)["\'\s>]#'; |
|
159
|
|
|
// If the attributes are not in the order property => content (e.g. Github) |
|
160
|
|
|
// New regex to keep this readable... more or less. |
|
161
|
|
|
$ogRegexReverse = '#<meta[^>]+content=["\']?([^"\'\s]+)[^>]+(?:'. $properties .')=["\']?og:image["\'\s/>]#'; |
|
162
|
|
|
|
|
163
|
|
|
if (preg_match($ogRegex, $content, $matches) > 0 |
|
164
|
|
|
|| preg_match($ogRegexReverse, $content, $matches) > 0 |
|
165
|
|
|
) { |
|
166
|
|
|
return $matches[1]; |
|
167
|
|
|
} |
|
168
|
|
|
|
|
169
|
|
|
return false; |
|
170
|
|
|
} |
|
171
|
|
|
|
|
172
|
|
|
/** |
|
173
|
|
|
* @inheritdoc |
|
174
|
|
|
*/ |
|
175
|
|
|
public function isHotlinkAllowed() |
|
176
|
|
|
{ |
|
177
|
|
|
return true; |
|
178
|
|
|
} |
|
179
|
|
|
|
|
180
|
|
|
/** |
|
181
|
|
|
* @inheritdoc |
|
182
|
|
|
*/ |
|
183
|
|
|
public function checkRules($rules) |
|
184
|
|
|
{ |
|
185
|
|
|
} |
|
186
|
|
|
|
|
187
|
|
|
/** |
|
188
|
|
|
* @inheritdoc |
|
189
|
|
|
*/ |
|
190
|
|
|
public function loadRules($rules) |
|
191
|
|
|
{ |
|
192
|
|
|
} |
|
193
|
|
|
|
|
194
|
|
|
/** |
|
195
|
|
|
* @inheritdoc |
|
196
|
|
|
*/ |
|
197
|
|
|
public function getName() |
|
198
|
|
|
{ |
|
199
|
|
|
return 'default'; |
|
200
|
|
|
} |
|
201
|
|
|
} |
|
202
|
|
|
|
ArthurHoaro /
web-thumbnailer
