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1 | <?php |
2 | |
3 | /** |
4 | * Google cover content loader. |
5 | * |
6 | * PHP version 8 |
7 | * |
8 | * Copyright (C) Villanova University 2010. |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License version 2, |
12 | * as published by the Free Software Foundation. |
13 | * |
14 | * This program is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
17 | * GNU General Public License for more details. |
18 | * |
19 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
22 | * |
23 | * @category VuFind |
24 | * @package Content |
25 | * @author Demian Katz <demian.katz@villanova.edu> |
26 | * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License |
27 | * @link https://vufind.org/wiki/development Wiki |
28 | */ |
29 | |
30 | namespace VuFind\Content\Covers; |
31 | |
32 | use VuFind\Exception\HttpDownloadException; |
33 | |
34 | use function is_callable; |
35 | |
36 | /** |
37 | * Google cover content loader. |
38 | * |
39 | * @category VuFind |
40 | * @package Content |
41 | * @author Demian Katz <demian.katz@villanova.edu> |
42 | * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License |
43 | * @link https://vufind.org/wiki/development Wiki |
44 | */ |
45 | class Google extends \VuFind\Content\AbstractCover implements \VuFind\Http\CachingDownloaderAwareInterface |
46 | { |
47 | use \VuFind\Http\CachingDownloaderAwareTrait; |
48 | |
49 | /** |
50 | * Constructor |
51 | */ |
52 | public function __construct() |
53 | { |
54 | $this->supportsIsbn = $this->supportsOclc = true; |
55 | $this->cacheOptionsSection = 'GoogleCover'; |
56 | } |
57 | |
58 | /** |
59 | * Get image URL for a particular API key and set of IDs (or false if invalid). |
60 | * |
61 | * @param string $key API key |
62 | * @param string $size Size of image to load (small/medium/large) |
63 | * @param array $ids Associative array of identifiers (keys may include 'isbn' |
64 | * pointing to an ISBN object and 'issn' pointing to a string) |
65 | * |
66 | * @return string|bool |
67 | * |
68 | * @SuppressWarnings(PHPMD.UnusedFormalParameter) |
69 | */ |
70 | public function getUrl($key, $size, $ids) |
71 | { |
72 | // Don't bother trying if we can't read JSON or ISBN and OCLC are missing: |
73 | if (!is_callable('json_decode') || (!isset($ids['isbn']) && !isset($ids['oclc']))) { |
74 | return false; |
75 | } |
76 | |
77 | // Construct the request URL and make the HTTP request: |
78 | if (isset($ids['isbn']) && $ids['isbn']->isValid()) { |
79 | $ident = "ISBN:{$ids['isbn']->get13()}"; |
80 | } elseif (isset($ids['oclc'])) { |
81 | $ident = "OCLC:{$ids['oclc']}"; |
82 | } else { |
83 | return false; |
84 | } |
85 | $url = 'https://books.google.com/books?jscmd=viewapi&' . |
86 | 'bibkeys=' . $ident . '&callback=addTheCover'; |
87 | |
88 | $decodeCallback = function (\Laminas\Http\Response $response, $url) { |
89 | if ( |
90 | !preg_match( |
91 | '/^[^{]*({.*})[^}]*$/', |
92 | $response->getBody(), |
93 | $matches |
94 | ) |
95 | ) { |
96 | throw new HttpDownloadException( |
97 | 'Invalid response body (raw)', |
98 | $url, |
99 | $response->getStatusCode(), |
100 | $response->getHeaders(), |
101 | $response->getBody() |
102 | ); |
103 | } |
104 | |
105 | // convert \x26 or \u0026 to & |
106 | $json = json_decode( |
107 | str_replace(['\\x26', '\\u0026'], '&', $matches[1]), |
108 | true |
109 | ); |
110 | |
111 | if ($json === null) { |
112 | throw new HttpDownloadException( |
113 | 'Invalid response body (json)', |
114 | $url, |
115 | $response->getStatusCode(), |
116 | $response->getHeaders(), |
117 | $response->getBody() |
118 | ); |
119 | } |
120 | |
121 | return $json; |
122 | }; |
123 | |
124 | if (!isset($this->cachingDownloader)) { |
125 | throw new \Exception('CachingDownloader initialization failed.'); |
126 | } |
127 | |
128 | $json = $this->cachingDownloader->download($url, [], $decodeCallback); |
129 | // find the first thumbnail URL and process it: |
130 | foreach ((array)$json as $current) { |
131 | if (isset($current['thumbnail_url'])) { |
132 | $imageUrl = $current['thumbnail_url']; |
133 | if ($size == 'medium' || $size == 'large') { |
134 | $imageUrl = str_replace('zoom=5', 'zoom=1', $imageUrl); |
135 | } |
136 | return $imageUrl; |
137 | } |
138 | } |
139 | return false; |
140 | } |
141 | } |